CN106771834B - A kind of more DC source input wires detection systems and photovoltaic string type inverter system - Google Patents
A kind of more DC source input wires detection systems and photovoltaic string type inverter system Download PDFInfo
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- CN106771834B CN106771834B CN201710105807.5A CN201710105807A CN106771834B CN 106771834 B CN106771834 B CN 106771834B CN 201710105807 A CN201710105807 A CN 201710105807A CN 106771834 B CN106771834 B CN 106771834B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
A kind of more DC source input wires detection systems, to detect the wiring condition between DC source and access point, each pair of DC source access point includes positive and negative electrode access point, wiring detection system includes gating circuit, sample circuit, controller and alarm unit, gating circuit includes first and second electric switch, first and second electric switch connects one to one with anode, cathode access point respectively；Controller successively gates first and second electric switch, only gates first and second electric switch each time, and the corresponding positive and negative electrode access point of electric switch gated simultaneously is the access point of different DC sources；Sample circuit carries out corresponding voltage sample after first and second electric switch gating, to obtain corresponding sampled voltage；Controller output abnormality testing result when determining the difference between sampled voltage and predeterminated voltage beyond in preset range.The application detects automatically, without human intervention, avoids personal safety accident, saves labour turnover, testing result is accurate and reliable.
Description
Technical field
The present invention relates to inverter technology field more particularly to a kind of more DC source input wires detection systems and photovoltaic group
String inverter system.
Background technique
Photovoltaic panel in photovoltaic string type inverter system includes multichannel photovoltaic group string, and every road photovoltaic group string input can be equivalent
For a DC source.With the increase of single-machine capacity, generally expand generated energy by the way of multichannel MPPT maximum power point tracking.It is logical
The MPPT maximum power point tracking of the road Chang Mei is generally by all the way or two-way group forms in series and parallel.With single inverter access group string quantity
Increase, a possibility that wrong line increases with it when construction.The wrong line type of its objective reality has several hundred kinds, wherein seriously threatening
The operating condition of inverter and component safety just has tens kinds.By taking the photovoltaic plant being currently running as an example, can all have because defeated every year
Machine fail to open even aircraft bombing, burns the generation of the phenomenon that machine caused by entering wrong line, while bringing loss to operator,
Work difficulty is increased to operation maintenance personnel.Therefore, wrong anti-for string type photovoltaic DC-to-AC converter is a critically important job.Mesh
Before, certain methods are used to reduce the probability of wrong line.For example, the positive and negative anodes of every road group string are used male terminal and female end respectively
Sub-district point, and positive and negative anodes are distinguished with different colours.In addition, first being measured with multimeter before group concatenating, determination will be connect
Whether the voltage and polarity of the group string entered are correct.Suchlike method reason is simple, but is also difficult to simultaneously with certain defect
Cover all scenes.For example, big with multimeter measurement voltage power supply amount, to the person, there are security risks, secondly, working as external environment
When severe, the accuracy of artificial detection result not can guarantee.
Summary of the invention
The technical problem to be solved by the embodiment of the invention is that provide a kind of more DC source input wires detection systems and
Photovoltaic string type inverter system, to reduce the generation because of personal safety accident caused by checking input wires, as a result accurately
Reliably, it and saves labour turnover.
In a first aspect, being applied to photovoltaic group the embodiment of the invention provides a kind of more DC source input wires detection systems
In string inverter system, to detect N number of DC source and N to the wiring condition between DC source access point, each pair of DC source is connect
Access point includes a positive access point and a cathode access point, the wiring detection system include gating circuit, sample circuit,
Controller and alarm unit, the gating circuit include N number of first electric switch and N number of second electric switch, N number of first electric switch with
It is N number of anode access point connect one to one, N number of second electric switch connects one to one with N number of cathode access point, N for greater than etc.
In 2 natural number；
The controller connects N number of first electric switch and N number of second electric switch, for successively gating N number of first electric switch
In every one first electric switch, and successively gate every one second electric switch in N number of second electric switch simultaneously, wherein each time
Only gate first electric switch and second electric switch, and the corresponding anode of first and second electric switch gated simultaneously
Access point is the access point of different DC sources from cathode access point；
The sample circuit is connected to N number of first electric switch and N number of second electric switch, in the controller to described
One and second electric switch gating after carry out corresponding voltage sample, to obtain corresponding sampled voltage；
The controller is additionally coupled to the sample circuit, for determining between the sampled voltage and predeterminated voltage
Output abnormality testing result when difference is beyond in preset range, to show the corresponding DC source of the sampled voltage and corresponding direct current
There are wrong line situations between the access point of source.
Wherein, more DC source input wires detection systems further include ground insulation impedance detection circuit, it is described over the ground
Insulation resistance detection circuit includes first resistor, second resistance, 3rd resistor, the 4th resistance, third electric switch, the 4th electric switch
And the 5th electric switch, the first end of the first resistor are connected to every one first electric switch, the second end of the first resistor according to
Secondary to be connected to every one second electric switch by the described second to the 4th resistance, the node between second and third described resistance passes through
The third electric switch ground connection, the 4th electric switch are connected in parallel on the both ends of the first resistor, and the 5th electric switch is in parallel
At the both ends of the 4th resistance；
The sample circuit includes the first difference channel and the second difference channel, two input terminals of first difference channel
For obtaining first and second described ohmically voltage, two input terminals of second difference channel are for obtaining the third
And the 4th ohmically voltage, the output end of first and second difference channel are connected to the controller；
The controller is additionally coupled to the third to the 5th electric switch, and the controller is also used to gated simultaneously
When the corresponding positive access point of first and second electric switch is with the access point that cathode access point is different DC sources, control described the
Three to the 5th electric switches disconnect, and the controller is also used to successively gate every one first electric switch in N number of first electric switch, and
Successively gate every one second electric switch in N number of second electric switch simultaneously, wherein only gate each time first electric switch and
One the second electric switch, and the corresponding positive access point of first and second electric switch and cathode access point that are gated simultaneously are same
A pair of of access point of one DC source, while it being successively alternately closed the 4th electric switch and the 5th electric switch, and keep third electric switch
It is constantly in closed state, with the ground insulation resistance of the corresponding DC source of determination；
The controller is also used to determine the anode of corresponding DC source according to the ground insulation resistance of determining DC source
Voltage between access point and the cathode access point of other each DC sources, using as the predeterminated voltage.
Wherein, the ground insulation impedance detection circuit further includes the 5th resistance, between second and third described resistance
Node passes sequentially through the third electric switch and the 5th resistance eutral grounding.
Wherein, first difference channel include the first operational amplifier, the 6th resistance, the 7th resistance, the 8th resistance and
The first input end of 9th resistance, first operational amplifier is connected to the first of the first resistor by the 6th resistance
End, the first input end of first operational amplifier also pass through the 7th resistance and are connected to voltage end, first operation
Second input terminal of amplifier is connected to the node between the second resistance and 3rd resistor by the 8th resistance, and described first
Second input terminal of operational amplifier also passes through the output end that the 9th resistance is connected to first operational amplifier；
Second difference channel includes second operational amplifier, the tenth resistance, eleventh resistor, twelfth resistor and
The first input end of 13 resistance, the second operational amplifier is connected to the second resistance and third electricity by the tenth resistance
Node between resistance, the first input end of the second operational amplifier are also connected to the voltage by the eleventh resistor
End, the second input terminal of the second operational amplifier are connected to second electric switch by twelfth resistor, and described second
Second input terminal of operational amplifier is also connected to the output end of the second operational amplifier, institute by the thirteenth resistor
The output end for stating first and second operational amplifier is connected to the controller.
Wherein, the 6th resistance is equal with the resistance value of the tenth resistance, the 7th resistance and the 11st electricity
The resistance value of resistance is equal, and the 8th resistance is equal with the resistance value of the twelfth resistor, the 9th resistance and the described 13rd
The resistance value of resistance is identical, and the first resistor is equal with the resistance value of the 4th resistance, the second resistance and third electricity
The resistance value of resistance is equal.
Wherein, the gating circuit further includes 2N the 14th resistance, and every one first electric switch passes through one the 14th
Resistance is connected to corresponding positive access point, and every one second electric switch passes through the 14th resistance and is connected to corresponding cathode
Access point.
Wherein, more DC source input wires detection systems further include accessory power supply, the input terminal of the accessory power supply
It is connected to predetermined direct current source access point, and the input terminal of the accessory power supply and the node of predetermined direct current source access point are located at
Between dc switch unit in predetermined direct current source access point and the inverter system, the output end of the accessory power supply
It is connected to the voltage end of the controller, the voltage end of the controller is additionally coupled to the conversion of the voltage in the inverter system
Circuit, the controller receive voltage when the dc switch unit is disconnected at the accessory power supply, and in the direct current
Voltage is received after closing the switch from the voltage conversion circuit, wherein predetermined direct current source access point is that N connects DC source
A pair in access point.
Wherein, more DC source input wires detection systems further include record storage module, the record storage module
For according to the abnormality detection result record storage wiring error information, the controller to be also used to recognizing the direct current
Source obtains the wiring error information after powering on, and shows the wiring error information.
Wherein, more DC source input wires detection systems further include alarm unit, and the controller is connected to described
Alarm unit, to control the warning when determining the difference between the sampled voltage and predeterminated voltage beyond in preset range
Unit is warned.
Second aspect, the embodiment of the present invention also provide a kind of photovoltaic string type inverter system, including N number of DC source, inverse
Become device and more DC source input wires detection systems, the inverter includes N to DC source access point, and N number of DC source connects
The N being connected to DC source access point, more DC source input wires detection systems are connected to N to DC source access point, with
N number of DC source and the N are detected later to the wiring condition between DC source access point being activated, wherein each pair of DC source
Access point includes a positive access point and a cathode access point, and the wiring detection system includes gating circuit, sampling electricity
Road, controller and alarm unit, the gating circuit include N number of first electric switch and N number of second electric switch, and N number of first establishes by cable
Close and connect one to one with N number of positive access point, N number of second establishes by cable and connects one to one with N number of cathode access point, N for greater than
Natural number equal to 2；
The controller connects N number of first electric switch and N number of second electric switch, for being opened in the wiring detection system
Every one first electric switch in N number of first electric switch is successively gated after dynamic, and is successively gated simultaneously every in N number of second electric switch
One second electric switch, wherein for only gating first electric switch and second electric switch each time, and being gated simultaneously
One and second the corresponding positive access point of electric switch with cathode access point be different DC sources access point；
The sample circuit is connected to N number of first electric switch and N number of second electric switch, in the controller to described
One and second electric switch gating after carry out corresponding voltage sample, to obtain corresponding first sampled voltage；
The controller is additionally coupled to the sample circuit, for determining first sampled voltage and the default electricity
Difference between pressure exceeds output abnormality testing result when in preset range, to show the corresponding DC source of first sampled voltage
There are wrong line situations between corresponding DC source access point.
Wherein, more DC source input wires detection systems further include ground insulation impedance detection circuit, it is described over the ground
Insulation resistance detection circuit includes first resistor, second resistance, 3rd resistor, the 4th resistance, third electric switch, the 4th electric switch
And the 5th electric switch, the first end of the first resistor are connected to every one first electric switch, the second end of the first resistor according to
Secondary to be connected to every one second electric switch by the described second to the 4th resistance, the node between second and third described resistance passes through
The third electric switch ground connection, the 4th electric switch are connected in parallel on the both ends of the first resistor, and the 5th electric switch is in parallel
At the both ends of the 4th resistance；
The sample circuit includes the first difference channel and the second difference channel, two input terminals of first difference channel
For obtaining first and second described ohmically voltage, two input terminals of second difference channel are for obtaining the third
And the 4th ohmically voltage, the output end of first and second difference channel are connected to the controller；
The controller is additionally coupled to the third to the 5th electric switch, and the controller is also used to gated simultaneously
When the corresponding positive access point of first and second electric switch is with the access point that cathode access point is different DC sources, control described the
Three to the 5th electric switches disconnect, and the controller is also used to successively gate every one first electric switch in N number of first electric switch, and
Successively gate every one second electric switch in N number of second electric switch simultaneously, wherein only gate each time first electric switch and
One the second electric switch, and the corresponding positive access point of first and second electric switch and cathode access point that are gated simultaneously are same
A pair of of access point of one DC source, while it being successively alternately closed the 4th electric switch and the 5th electric switch, and keep third electric switch
It is constantly in closed state, with the ground insulation resistance of the corresponding DC source of determination；
The controller is also used to determine the anode of corresponding DC source according to the ground insulation resistance of determining DC source
Voltage between access point and the cathode access point of other each DC sources, using as the predeterminated voltage.
Wherein, first difference channel include the first operational amplifier, the 6th resistance, the 7th resistance, the 8th resistance and
The first input end of 9th resistance, first operational amplifier is connected to the first of the first resistor by the 6th resistance
End, the first input end of first operational amplifier also pass through the 7th resistance and are connected to voltage end, first operation
Second input terminal of amplifier is connected to the node between the second resistance and 3rd resistor by the 8th resistance, and described first
Second input terminal of operational amplifier also passes through the output end that the 9th resistance is connected to first operational amplifier；
Second difference channel includes second operational amplifier, the tenth resistance, eleventh resistor, twelfth resistor and
The first input end of 13 resistance, the second operational amplifier is connected to the second resistance and third electricity by the tenth resistance
Node between resistance, the first input end of the second operational amplifier are also connected to the voltage by the eleventh resistor
End, the second input terminal of the second operational amplifier are connected to second electric switch by twelfth resistor, and described second
Second input terminal of operational amplifier is also connected to the output end of the second operational amplifier, institute by the thirteenth resistor
The output end for stating first and second operational amplifier is connected to the controller.
Wherein, the 6th resistance is equal with the resistance value of the tenth resistance, the 7th resistance and the 11st electricity
The resistance value of resistance is equal, and the 8th resistance is equal with the resistance value of the twelfth resistor, the 9th resistance and the described 13rd
The resistance value of resistance is identical, and the first resistor is equal with the resistance value of the 4th resistance, the second resistance and third electricity
The resistance value of resistance is equal.
Wherein, the inverter system further includes dc switch unit and voltage conversion circuit, the wiring detection system
It further include accessory power supply, the dc switch unit includes 2N switch, positive access point and the cathode access of each pair of DC source
Point connects the voltage conversion circuit by a switch, and the input terminal of the accessory power supply is connected to the access of predetermined direct current source
Point, and the input terminal of the accessory power supply and the node in the predetermined direct current source are located at the predetermined direct current source and open with the direct current
It closes between unit, the output end of the accessory power supply is connected to the voltage end of the controller, and the voltage end of the controller is also
It is connected to the voltage conversion circuit, the controller receives at the accessory power supply when the dc switch unit is disconnected
Voltage, and voltage is received at the voltage conversion circuit after dc switch closure, wherein the predetermined direct current source connects
Access point is N to a pair in DC source access point.
Wherein, the controller is for successively gating N number of first electric switch, and successively gates N number of second electric switch simultaneously,
Wherein, first electric switch and second electric switch are only gated each time, and gated simultaneously first and second establish by cable
It closes corresponding positive access point and cathode access point is the access point of same DC source；
The sample circuit is also used to carry out after the controller is to first and second described electric switch gating corresponding
Voltage sample, to obtain corresponding second sampled voltage, the controller is also used to obtain the voltage conversion circuit output
Reference voltage between each pair of DC source access point stops when second sampled voltage is matched with corresponding reference voltage
Start the wiring detection system, when sampled voltage is mismatched with corresponding reference voltage, starts the wiring detection system.
Wherein, the photovoltaic string type inverter system further includes N number of immunity module and N number of lightning-protection module, every a pair
DC source access point passes through an immunity module and a lightning-protection module is connected to the corresponding of the dc switch unit
Switch.
Wherein, more DC source input wires detection systems further include record storage module, the record storage module
For according to the abnormality detection result record storage wiring error information, the controller to be also used to recognizing the direct current
Source obtains the wiring error information after powering on, and shows the wiring error information.
By implementing the embodiment of the present invention, what the controller successively gated in N number of first electric switch every 1 first is established by cable
It closes, and successively gates every one second electric switch in N number of second electric switch simultaneously, wherein only gate one first electricity each time
Switch and second electric switch, and the corresponding positive access point of first and second electric switch and cathode that are gated simultaneously access
Point is the access point of different DC sources, and the sample circuit carries out corresponding voltage sample, to obtain corresponding sampled voltage, when
Output abnormality detection knot when the controller determines the difference between the sampled voltage and predeterminated voltage beyond in preset range
Fruit, to show, there are wrong line situations between the corresponding DC source of first sampled voltage and corresponding DC source access point.Cause
This, the detection that more DC source input wires detection systems carry out the wiring condition of DC source and DC source access point is certainly
Dynamic detection, the personal safety caused without human intervention, due to avoid the wiring issue because checking DC source and DC source access point
Accident problem, saves labour turnover, and testing result is accurate and reliable.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of frame for more DC source input wires detection systems that first aspect of the present invention first embodiment provides
Figure；
Fig. 2 is a kind of circuit for more DC source input wires detection systems that first aspect of the present invention first embodiment provides
Figure；
Fig. 3 is a kind of frame for more DC source input wires detection systems that first aspect of the present invention second embodiment provides
Figure；
Fig. 4 is a kind of circuit for more DC source input wires detection systems that first aspect of the present invention second embodiment provides
Figure；
Fig. 5 is a kind of frame for more DC source input wires detection systems that first aspect of the present invention 3rd embodiment provides
Figure；
Fig. 6 is a kind of circuit for more DC source input wires detection systems that first aspect of the present invention 3rd embodiment provides
Figure；
Fig. 7 is the equivalent schematic diagram of the ground insulation impedance detection circuit in Fig. 4；
Fig. 8 is a kind of block diagram for photovoltaic string type inverter system that second aspect of the present invention embodiment provides.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, is illustrated to the embodiment of the present invention.
It should be noted that the term used in embodiments of the present invention be for for the purpose of describing particular embodiments, and
It is not intended to be limiting the present invention.In the embodiment of the present invention and the "an" of singular used in the attached claims, " institute
State " and "the" be also intended to including most forms, unless the context clearly indicates other meaning.It is also understood that making herein
Term "and/or" refers to and may combine comprising one or more associated any or all of project listed.
It is a kind of more DC source input wires detections that first aspect of the present invention first embodiment provides referring to Fig. 1 and Fig. 2
System 100.More DC source input wires detection systems 100 are applied in photovoltaic string type inverter system, N number of to detect
To the wiring condition between DC source access point, each pair of DC source access point includes a positive access point and one by DC source and N
A cathode access point.More DC source input wires detection systems 100 include gating circuit 10, controller 20, sample circuit
30 and alarm unit 40.
It should be noted that the photovoltaic string type inverter system is applied to photovoltaic power generation field.The photovoltaic string type
Inverter system includes multiple DC sources and inverter.The inverter includes multipair DC source access point.Multiple DC sources with
Multipair DC source access point wiring connection.In the present embodiment, DC source can be photovoltaic panel.The DC source provides less steady
Fixed direct current.The inverter is equivalent to electric energy converting equipment, relatively stable for being converted to the DC source of less stable
Alternating current be supplied to power grid.
The gating circuit 10 includes N number of first electric switch K1 and N number of second electric switch K2.N number of first electric switch K1 and N
A anode access point connects one to one.N number of second electric switch K2 connects one to one with N number of cathode access point, N be greater than etc.
In 2 natural number.
The controller 20 connects N number of first electric switch K1 and N number of second electric switch K2, for successively gating N number of first
Every one first electric switch K1 in electric switch K1, and every one second electric switch in N number of second electric switch K2 is successively gated simultaneously
K2, wherein only gate an a first electric switch K1 and second electric switch K2 each time, and gated simultaneously first and the
The corresponding positive access point of two electric switch K1 and K2 is the access point of different DC sources from cathode access point.
The sample circuit 30 is connected to N number of first electric switch K1 and N number of second electric switch K2, in the controller 20
To corresponding voltage sample is carried out after first and second electric switch K1 and K2 gating, to obtain corresponding sampled voltage.Institute
It states controller 20 and is additionally coupled to the sample circuit 30, for determining that the difference between the sampled voltage and predeterminated voltage is super
Output abnormality testing result when out in preset range.
It is established by cable it should be noted that the controller 20 passes through every 1 first successively gated in N number of first electric switch K1
K1 is closed, and successively gates every one second electric switch K2 in N number of second electric switch K2 simultaneously, wherein only gates one each time
A first electric switch K1 and second electric switch K2, and the corresponding anode of first and second electric switch K1 and K2 gated simultaneously
Access point is the access point of different DC sources from cathode access point, then the sample circuit 30 can sample N2N number of sampling electricity
Pressure.Whether the controller 20 is used to determine the difference between each sampled voltage and predeterminated voltage in preset range.In this reality
It applies in example, the predeterminated voltage can be zero.When the wiring between multiple DC sources and corresponding DC source access point does not connect
In the case where mistake, the voltage between the positive access point and cathode access point of different DC sources should be zero or only minimum electricity
Pressure, and the minimum voltage is in the preset range.Difference between i.e. collected sampled voltage and predeterminated voltage is pre-
If when in range, showing the case where there is no wrong lines between DC source and corresponding DC source access point.It is adopted when collected
When difference between sample voltage and predeterminated voltage is not in the preset range, show that the DC source is accessed with corresponding DC source
The case where there are wrong lines between point.
Wherein, the controller exports the abnormality detection result and can be is exported by way of display, such as institute
It states controller and shows the abnormality detection result.Or more DC source input wires detection systems 100 can also include aobvious
Show module.When the controller 20 determines the difference between collected sampled voltage and predeterminated voltage beyond the preset range
When interior, show the case where there are wrong lines between the DC source and corresponding DC source access point, which control display module shows
The case where there are wrong lines between a DC source and corresponding DC source access point, so that staff can debug.
Further, the gating circuit 10 further includes 2N the 14th resistance R14, and every one first electric switch K1 passes through
One the 14th resistance R14 is connected to corresponding positive access point, and every one second electric switch K2 passes through the 14th resistance
R14 is connected to corresponding cathode access point.
The adjacent first or second electric switch K1 or K2 are closed at and cause short circuit that will establish by cable in the case of wrong line in order to prevent
Pass is burnt out, and seals in a proper resistor before each first and second electric switch K1 and K2, the quantity and specification of resistance can roots
Depending on actual conditions.In the present embodiment, the resistance value of the 2N the 14th resistance R14 is equal.
In the present embodiment, the N is 4.First and second electric switch K1 and K2 is relay.It is described N number of straight
Stream source is the input of the road N photovoltaic group string.In other embodiments, the N can be to be arbitrarily large in the natural number for being equal to 2.Described
One and second electric switch K1 and K2 can also be adjusted according to actual needs.
In the present embodiment, the sample circuit 30 is difference channel.The difference channel include operational amplifier U3 and
Resistance R15-18.The first input end of the operational amplifier U3 is connected to the first electric switch K1 by resistance R15, and leads to
It crosses resistance R16 and is connected to voltage end V.The second input terminal of the operational amplifier U3 is connected to described second by resistance R17
Electric switch K2, and it is connected to by resistance R18 the output end of the operational amplifier U3.The output end of the operational amplifier U3
It is connected to the controller 20.
Further, more direct current input wires detection systems 100 further include record storage module.The record storage
Module is used for according to the abnormality detection result record storage wiring error information.The controller 20 is also used to recognizing
It states and obtains the wiring error information after DC source powers on, and show the wiring error information.
It should be noted that when more direct current input wires detection systems 100 connect DC source with corresponding DC source
Result can be will test after line detection between access point and carry out record storage.It is when the inverter system powers on, i.e., described
DC source powers on, and the controller 20 shows the testing result.Certainly, when testing result is no wiring error
When, only just wiring error information can also be shown when testing result is wiring error without display.Institute
Meaning DC source powers on, and is that DC source is connected to corresponding DC source access point.
In the present embodiment, the controller 20 successively gates every one first electric switch K1 in N number of first electric switch K1,
And every one second electric switch K2 in N number of second electric switch K2 is successively gated simultaneously, wherein only gate one first electricity each time
A switch K1 and second electric switch K2, and the corresponding positive access point of first and second electric switch K1 and K2 gated simultaneously
It is the access point of different DC sources from cathode access point, the sample circuit 30 carries out corresponding voltage sample, corresponding to obtain
Sampled voltage, when the controller 20 determines the difference between the sampled voltage and predeterminated voltage beyond in preset range
Output abnormality testing result, so as to exist between the corresponding DC source of the sampled voltage and corresponding DC source access point to show
Wrong line situation.Therefore, wiring feelings of the more DC source input wires detection systems 100 to DC source and DC source access point
The detection that condition carries out is to detect automatically, without human intervention, avoids the wiring issue because checking DC source and DC source access point
And the personal safety accident problem caused, it saves labour turnover, testing result is accurate and reliable.
Fig. 3 and Fig. 4 is please referred to, second embodiment of the invention provides a kind of more DC source input wires detection systems 200.Institute
It states more DC source input wires detection systems 200 and provides a kind of more DC source input wires detection systems compared to first embodiment
100 is similar, and the difference of the two is: more DC source input wires detection systems 200 further include can also be single including warning
Member 40.The controller 20 is connected to the alarm unit 40, to determine the difference between the sampled voltage and predeterminated voltage
The alarm unit 40 is controlled when value is beyond in preset range to be warned.
Since more direct current input wires detection systems 200 are in the dc switch of the photovoltaic string type inverter system
Unit is initiated to be detected when disconnecting, and when testing result shows that all wiring are normal, warning can be removed, staff
It can control the closure dc switch unit, so that the inverter system works.
Further, more DC source input wires detection systems 200 further include accessory power supply 50.The accessory power supply
50 input terminal is connected to predetermined direct current source access point, and the input terminal of the accessory power supply 50 and the predetermined direct current source are accessed
The node of point is located between the dc switch unit in predetermined direct current source access point and the inverter system.The auxiliary
The output end of power supply 50 is connected to the voltage end of the controller 20.The voltage end of the controller 20 is additionally coupled to the photovoltaic
Voltage conversion circuit in string type inverter system.The controller 20 is when the dc switch unit is disconnected from described auxiliary
Reception voltage at power supply 20 is helped, and receives voltage at the voltage conversion circuit after dc switch unit closure,
In, predetermined direct current source access point is N to a pair in DC source access point.
Wherein, the node of the input terminal of the accessory power supply 50 and predetermined direct current source access point is located at described predetermined straight
Between dc switch unit in stream source access point and the photovoltaic string type inverter system, in this way, in the photovoltaic group string
The dc switch unit of formula inverter system is in when disconnecting can also obtain voltage from the DC source access point, described auxiliary
Output is to the controller 20 after helping voltage of the voltage 50 for will acquire to carry out conversion and pressure stabilizing, to mention for the controller 20
For operating voltage.
It should be noted that more DC source input wires detection systems 200 are to N number of DC source and N to DC source
Wiring condition between access point carries out one-time detection.More DC source input wires detection systems 200 can also be predetermined
Number of days (such as first to third day) detects once at predetermined time intervals, and after predetermined number of days, the daily DC source, which powers on, to be examined
It surveys primary.In addition, the controller 20 recognizes direct current and opens when in the photovoltaic string type inverter system normal course of operation
It closes unit to be disconnected by being closed into, automatic starting detection is primary.
Fig. 5 and Fig. 6 is please referred to, first aspect of the present invention 3rd embodiment provides a kind of more DC source input wires detection systems
System 300.A kind of more DC source input wires detection systems 300 that the 3rd embodiment provides are provided with the second embodiment
A kind of wiring detection system 200 is similar, and the difference of the two is: in the third embodiment, more DC source input wires inspections
Examining system 300 further includes ground insulation impedance detection circuit 210.The ground insulation impedance detection circuit 210 includes the first electricity
Hinder R1, second resistance R2,3rd resistor R3, the 4th resistance R4, third electric switch K3, the 4th electric switch K4 and the 5th electric switch
K5, the first end of the first resistor R1 are connected to every one first electric switch K1, and the second end of the first resistor R1 is successively led to
It crosses the described second to the 4th resistance R2-R4 and is connected to every one second electric switch K2, between second and third resistance R2 and R3
Node be grounded by the third electric switch K3, the 4th electric switch K4 is connected in parallel on the both ends of the first resistor R1, institute
State the both ends that the 5th electric switch K5 is connected in parallel on the 4th resistance R4, the sample circuit 30 include the first difference channel 301 and
Second difference channel 302, two input terminals of first difference channel 301 are for obtaining first and second resistance R1 and R2
On voltage, two input terminals of second difference channel 302 are used to obtain the electricity on the third and the 4th resistance R3 and R4
Pressure, the output end of first and second difference channel 301 and 302 are connected to the controller 20, and the controller 20 also connects
The third is connected to the 5th electric switch K3-K5, the controller 20 be also used to gated simultaneously first and second establish by cable
When closing the corresponding positive access point of K1 and K2 from the access point that cathode access point is different DC sources, the third is controlled to the 5th
Electric switch K3-K5 is disconnected, and the controller 20 is also used to successively gate every one first electric switch in N number of first electric switch K1
K1, and successively gate every one second electric switch K2 in N number of second electric switch K2 simultaneously, wherein only gating one each time
An one electric switch K1 and second electric switch K2, and the corresponding anode of first and second electric switch K1 and K2 gated simultaneously connects
Access point and cathode access point are a pair of of access point of same DC source, while being successively alternately closed the electricity of the 4th electric switch K4 and the 5th
Switch K5, and third electric switch K3 is kept to be constantly in closed state, it is described with the ground insulation resistance of the corresponding DC source of determination
Controller 20 is also used to determine that the anode of corresponding DC source is each with other according to the ground insulation resistance of determining DC source
Voltage between the cathode of a DC source, using as the predeterminated voltage.
It should be noted that ground insulation impedance detection circuit 210 is used to detect the anode and cathode pair of each straight power supply
The insulation impedance on ground.In actual photovoltaic power generation scene, the presence of photovoltaic panel ground insulation resistance, so that charge passes through the resistance
It is anti-to be formed into a loop between another way photovoltaic group string through the earth.When ambient enviroment tends to good, insulation against ground resistance can be very big,
Steady state voltage meeting very little between each road of photovoltaic panel, even zero.Once can environment be deteriorated, such as rainy weather, insulation against ground
Impedance reduces, and will be coupled out sizable voltage between the two-way in photovoltaic panel.If operator does not know group string over the ground
Impedance reduce in the case where measured with multimeter, can enable operator that can not make accurate judgment then measuring result.
Further, the ground insulation impedance detection circuit 210 further includes the 5th resistance R5, second and third described electricity
Node between resistance R2 and R3 passes sequentially through the third electric switch K3 and the 5th resistance R5 ground connection.
According to the ground insulation impedance detection circuit 210, it is successively alternately closed the 4th electric switch K4 and the 5th electric switch
K5, and third electric switch K3 is kept to be constantly in closed state, it can determine the positive electrode and negative electrode insulation against ground of every road DC source
Impedance Rx, Ry.
Referring to Fig. 5, being the equivalent schematic diagram of the ground insulation impedance detection circuit 210.For convenient for explaining in detail
The basic principle of earth impedance detection circuit, is illustrated by Fig. 5 below.In present principles figure, the ground insulation resistance
For Rx and Ry, first resistor R1 is equal with the resistance value of the 4th resistance R4, the second resistance R2 and the 3rd resistor R3
Resistance value it is equal.Operation can simplify using symmetrical resistance parameter.
There is different ground insulation resistances in each DC source, therefore need to determine insulation against ground to each DC source over the ground
Impedance.Determine that the concrete mode of the ground insulation resistance of each DC source is as follows.
The controller 20 by gating the first electric switch K1 and the second electric switch K2, and gate first and
The corresponding positive access point of second electric switch K1 and K2 and cathode access point are a pair of of DC source access point of same DC source.
That is, the controller has gated the DC source for needing to detect.
Firstly, the controller control third and the 4th electric switch K3 and K4, and the 5th electric switch K5 is disconnected, it obtains
The voltage of the output end output of first and second operational amplifier U1 and U2, is indicated with U1 ', U2 ' respectively.And according to U1 ',
U2 ' can determine the electric current in the 5th resistance R5, electric current in the 5th resistance R5 are as follows:
The positive access point of the DC source is to the voltage of the earth
Greatly it is to the voltage of the cathode access point of the DC source
Secondly, the controller 20 is also used to be closed third and the 5th electric switch K3 and K5, the 4th electric switch is disconnected
K4 obtains the voltage of the output end output of first and second operational amplifier U1 and U2, is indicated respectively with U1 ", U2 ".And
The electric current of the 5th resistance R5, the electric current of the 5th resistance R5 can be determined according to U1 ", U2 " are as follows:
The positive access point of the DC source is to the voltage of the earth
Greatly it is to the cathode access point voltage of the DC source
According to above-mentioned relation formula (1)-(6), using basic circuit principle, it can be deduced that following relational expression (7) (8),
Simultaneous (7) and (8) two relational expressions, it may be determined that the DC source ground insulation impedance value, i.e. Rx, Ry.
It needs, the determination of each DC source ground insulation resistance is through the above way.
After each DC source ground insulation resistance determines, the coupled voltages between different DC sources can be determined as institute
State predeterminated voltage.Specifically,
Wherein, Ei is the voltage of the i-th road DC source, and Ej is the voltage of the i-th road DC source, RdetFor insulation against ground resistance
Anti- itself internal resistance of detection circuit 210, Rxi, RyiRespectively the i-th road DC source anode and cathode ground insulation resistance, Rxj, RyjRespectively
For calculated jth road DC source anode and cathode ground insulation resistance.Ui+j-For the positive to jth of the i-th road DC source
Voltage between the cathode of road DC source, Uj+i-For the positive to the electricity between the cathode of the i-th road DC source of the i-th road DC source
Pressure.In the present embodiment, the N is natural number 4, therefore i and j value is 1,2,3 and 4.
It should be noted that being determined when the voltage value of the voltage Ej of the voltage Ei of the i-th road DC source and the i-th road DC source
, one is can also successively gate N number of first by the controller 20 in the voltage writing controller of DC source
Electric switch K1, and N number of second electric switch K2 is successively gated simultaneously, wherein a first electric switch K1 and one is only gated each time
A second electric switch K2, and the corresponding positive access point of first and second electric switch K1 and K2 and cathode that are gated simultaneously access
Point is a pair of of access point of same DC source；The sample circuit 30 be also used to the controller 20 to it is described first and second
Corresponding voltage sample is carried out after electric switch K1 and K2 gating, to obtain corresponding sampled voltage.The N number of voltage obtained after sampling
The voltage of as N number of DC source.Itself internal resistance R of the ground insulation impedance detection circuit 210detIt is also determining, therefore above-mentioned
Ui+j-And Uj+i-Relational expression can determine the i-th road DC source anode to the voltage U between the cathode of jth road DC sourcei+j-And
The anode of i-th road DC source is to the voltage U between the cathode of the i-th road DC sourcej+i-。
The anode of i-th road DC source is to the voltage U between the cathode of jth road DC sourcei+j-And i-th road DC source anode
To the voltage U between the cathode of the i-th road DC sourcej+i-The voltage obtained after determination as predeterminated voltage and actual measurement is compared
Compared with if difference between the two is in the preset range, then it is assumed that the DC source wiring between the road i-th and j is correct, if two
In the no longer described preset range of difference between person, then the DC source wiring error between the road i-th and j is thought.
Specifically, first difference channel 301 include the first operational amplifier U1, the 6th resistance R3, the 7th resistance R7,
The first input end of the 9th resistance R9 of 8th pole resistance R8, the first operational amplifier U1 are connected to institute by the 6th resistance R6
The first end of first resistor R1 is stated, the first input end of the first operational amplifier U1 also passes through the 7th resistance R7 connection
To voltage end V, the second input terminal of the first operational amplifier U1 is connected to the second resistance R2 by the 8th resistance R8
With the node between 3rd resistor R3, the second input terminal of the first operational amplifier U1 also passes through the 9th resistance R9 and connects
It is connected to the output end of the first operational amplifier U1, second difference channel 302 includes second operational amplifier U2, the tenth
Resistance R10, eleventh resistor R11, twelfth resistor R12 and thirteenth resistor R13, the first of the second operational amplifier U2
Input terminal is connected to the node between the second resistance R2 and 3rd resistor R3, second operation by the tenth resistance R10
The first input end of amplifier U2 is also connected to the voltage end V, second operation amplifier by the eleventh resistor R11
The second input terminal of device U2 is connected to the second electric switch K2, the second operational amplifier U2 by twelfth resistor R12
The second input terminal be also connected to the output end of the second operational amplifier U2 by the thirteenth resistor R13, described
One and the output end of second operational amplifier U1 and U2 be connected to the controller 20.
In the present embodiment, the 6th resistance R6 and the 8th resistance R8, the tenth resistance R10, the described tenth
The resistance value of two resistance R12 is equal, the 7th resistance R7 and the 9th resistance R9, the eleventh resistor R11, the described tenth
The resistance value of three resistance R13 is equal.
In the present embodiment, in the ground insulation impedance detection circuit 210, first resistor R1 and the 4th resistance R4
Resistance value it is equal, the second resistance R2 is equal with the resistance value of the 3rd resistor R3.The ground insulation impedance detection circuit
210 simplify operation when can carry out operation in the controller 20 using symmetrical resistance parameter.
Referring to Fig. 7, second aspect of the present invention embodiment provides a kind of photovoltaic string type inverter system 500.The light
Lying prostrate string type inverter system 500 includes N number of DC source 510, inverter 521 and wiring detection system.The inverter 521 wraps
N is included to DC source access point 520, dc switch unit 530 and voltage conversion circuit 540.N number of DC source 510 is connected to
The N is to DC source access point 520.More DC source input wires detection systems are connected to N to DC source access point 520,
To detect N number of DC source 510 and the N later to the wiring condition between DC source access point 520 being activated.Wherein, often
It include a positive access point and a cathode access point to DC source access point 520.More DC source input wires detections
System can provide wiring detection system 100,200 or 300 for above-mentioned the first, second or third embodiment of first scheme.At this
In embodiment, more DC source input wires detection systems are more DC source input wires inspection that above-mentioned 3rd embodiment provides
Examining system 300.Since the specific structure and function of more direct current input wires detection systems 300 are in above-mentioned first scheme
3rd embodiment in be described in detail, therefore details are not described herein.
It should be noted that when the controller 20 has other voltage supply modules to provide voltage for it, the auxiliary
Power supply 50 also can be omitted.
In the present embodiment, whether more DC source input wires detection systems 300 carry out wiring condition detection needs
Judge the break-make situation of the dc switch unit 530.When determining the dc switch unit 530 closure, show the light
Volt string type inverter system 500 has been activated, then without carrying out wiring condition detection.When the judgement dc switch unit
When 530 disconnection, shows that the photovoltaic string type inverter system 500 is not activated also, need to carry out wiring condition before activation
Detection, at this moment needs to start more DC source input wires detection systems 300.Specifically:
The controller 20 is used to successively gate every one first electric switch K1 in N number of first electric switch K1, and simultaneously according to
Every one second electric switch K2 in the N number of second electric switch K2 of secondary gating, wherein only gate each time a first electric switch K1 and
One the second electric switch K2, and the corresponding positive access point of first and second electric switch K1 and K2 gated simultaneously connects with cathode
Access point is a pair of of access point of same DC source；The sample circuit 30 is also used in the controller 20 to described first and
Corresponding voltage sample is carried out after two electric switch K1 and K2 gating, to obtain corresponding second sampled voltage, the controller 20
It is also used to obtain the reference voltage between each pair of DC source access point that the voltage conversion circuit 540 exports, when described second
When sampled voltage is matched with corresponding reference voltage, stop starting more DC source input wires detection systems 300, when described
When second sampled voltage is mismatched with corresponding reference voltage, start more DC source input wires detection circuits 300.
It should be noted that when second sampled voltage is matched with corresponding reference voltage, i.e., the described second sampling electricity
When pressing equal with corresponding reference voltage, show that the dc switch unit 530 is in the conductive state, is then carried out without butted line
Detection stops starting more DC source input wires detection systems 300.When second sampled voltage and corresponding reference electricity
When pressure mismatches, i.e., when described second sampled voltage and unequal corresponding reference voltage, show the dc switch unit 530
It is in an off state, then needs butted line to be detected, start more DC source input wires detection systems 300.
Further, the photovoltaic string type inverter system 500 further includes N number of immunity module 550 and N number of lightning protection mould
Block 560, every a pair of DC source access point passes through an immunity module 550 and a lightning-protection module 560 be connected to it is described straight
Flow the corresponding switch of switch unit 530.
In the present embodiment, the photovoltaic string type inverter system 500 includes more DC source input wires detections
System 300.More DC source input wires detection systems 300 include gating circuit 10, controller 20, sample circuit 30 and police
Show unit 40.After more DC source input wires detection systems 300 are activated, the controller 20 successively gates N number of
Every one first electric switch K1 in one electric switch K1, and every 1 second successively gated in N number of second electric switch K2 simultaneously establishes by cable
Close K2, wherein each time only gate an a first electric switch K1 and second electric switch K2, and gated simultaneously first and
The corresponding positive access point of second electric switch K1 and K2 is the access point of different DC sources, the sample circuit from cathode access point
30 carry out corresponding voltage sample, to obtain corresponding sampled voltage, when the determining sampled voltage of the controller 20 and in advance
Output abnormality testing result when if the difference between voltage is beyond in preset range, to show the corresponding DC source of the sampled voltage
There are wrong line situations between corresponding DC source access point.Therefore, the direct current of the photovoltaic string type inverter system 500
The wiring condition of source and DC source access point carry out detection be to detect automatically, without human intervention, avoid because investigation DC source with
The wiring issue of DC source access point and the personal safety accident problem caused, save labour turnover, testing result is accurate and reliable.
Above disclosed is only a preferred embodiment of the present invention, cannot limit the power of the present invention with this certainly
Sharp range, those skilled in the art can understand all or part of the processes for realizing the above embodiment, and weighs according to the present invention
Benefit requires made equivalent variations, still belongs to the scope covered by the invention.
Claims (17)
1. a kind of more DC source input wires detection systems are applied in photovoltaic string type inverter system, to detect N number of direct current
To the wiring condition between DC source access point, each pair of DC source access point includes that a positive access point and one are negative by source and N
Pole access point, it is characterised in that: more DC source input wires detection systems include gating circuit, sample circuit and control
Device, the gating circuit include N number of first electric switch and N number of second electric switch, N number of first electric switch and N number of positive access point
It connects one to one, N number of second electric switch connects one to one with N number of cathode access point, and N is the natural number more than or equal to 2；
The controller connects N number of first electric switch and N number of second electric switch, for successively gating in N number of first electric switch
Every one first electric switch, and every one second electric switch in N number of second electric switch is successively gated simultaneously, wherein it only selects each time
Logical first electric switch and second electric switch, and the corresponding anode access of first and second electric switch gated simultaneously
Point is the access point of different DC sources from cathode access point；
The sample circuit is connected to N number of first electric switch and N number of second electric switch, with the controller to described first and
Corresponding voltage sample is carried out after second electric switch gating, to obtain corresponding sampled voltage；
The controller is additionally coupled to the sample circuit, for determining the difference between the sampled voltage and predeterminated voltage
Output abnormality testing result when beyond in preset range, to show that the corresponding DC source of the sampled voltage connects with corresponding DC source
There are wrong line situations between access point.
2. more DC source input wires detection systems as described in claim 1, which is characterized in that more DC source inputs connect
Line detection system further includes ground insulation impedance detection circuit, and the ground insulation impedance detection circuit includes first resistor,
Two resistance, 3rd resistor, the 4th resistance, third electric switch, the 4th electric switch and the 5th electric switch, the first of the first resistor
End is connected to every one first electric switch, and the second end of the first resistor passes sequentially through the described second to the 4th resistance and is connected to often
One second electric switch, the node between second and third described resistance are grounded by the third electric switch, and the described 4th establishes by cable
The both ends for being connected in parallel on the first resistor are closed, the 5th electric switch is connected in parallel on the both ends of the 4th resistance；
The sample circuit includes the first difference channel and the second difference channel, and two input terminals of first difference channel are used for
Obtain first and second described ohmically voltage, two input terminals of second difference channel are for obtaining the third and the
Four ohmically voltages, the output end of first and second difference channel are connected to the controller；
The controller is additionally coupled to the third to the 5th electric switch, and the controller is also used in first gated simultaneously
And second the corresponding positive access point of electric switch and cathode access point for different DC sources access point when, control the third extremely
5th electric switch disconnects, and the controller is also used to successively gate every one first electric switch in N number of first electric switch, and simultaneously
Successively gate every one second electric switch in N number of second electric switch, wherein only gate first electric switch and one each time
Second electric switch, and the corresponding positive access point of first and second electric switch and cathode access point that are gated simultaneously are with always
A pair of of access point in stream source, while it being successively alternately closed the 4th electric switch and the 5th electric switch, and keep third electric switch always
In closed state, with the ground insulation resistance of the corresponding DC source of determination；
The controller is also used to determine the anode access of corresponding DC source according to the ground insulation resistance of determining DC source
Voltage between point and the cathode access point of other each DC sources, using as the predeterminated voltage.
3. more DC source input wires detection systems as claimed in claim 2, which is characterized in that the ground insulation resistance inspection
Slowdown monitoring circuit further includes the 5th resistance, and the node between second and third described resistance passes sequentially through the third electric switch and described
5th resistance eutral grounding.
4. more DC source input wires detection systems as claimed in claim 2, which is characterized in that the first difference channel packet
Include the first operational amplifier, the 6th resistance, the 7th resistance, the 8th resistance and the 9th resistance, the of first operational amplifier
One input terminal is connected to the first end of the first resistor, the first input end of first operational amplifier by the 6th resistance
Voltage end is also connected to by the 7th resistance, the second input terminal of first operational amplifier is connected by the 8th resistance
To node between the second resistance and 3rd resistor, the second input terminal of first operational amplifier also passes through described the
Nine resistance are connected to the output end of first operational amplifier；
Second difference channel includes second operational amplifier, the tenth resistance, eleventh resistor, twelfth resistor and the 13rd
Resistance, the first input end of the second operational amplifier by the tenth resistance be connected to the second resistance and 3rd resistor it
Between node, the first input end of the second operational amplifier is also connected to the voltage end by the eleventh resistor,
Second input terminal of the second operational amplifier is connected to second electric switch, second operation by twelfth resistor
Second input terminal of amplifier is also connected to the output end of the second operational amplifier by the thirteenth resistor, and described
One and the output end of second operational amplifier be connected to the controller.
5. more DC source input wires detection systems as claimed in claim 4, which is characterized in that the 6th resistance with it is described
The resistance value of tenth resistance is equal, and the 7th resistance is equal with the resistance value of the eleventh resistor, the 8th resistance with it is described
The resistance value of twelfth resistor is equal, and the 9th resistance is identical as the resistance value of the thirteenth resistor, the first resistor and institute
The resistance value for stating the 4th resistance is equal, and the second resistance is equal with the resistance value of the 3rd resistor.
6. more DC source input wires detection systems as claimed in claim 5, which is characterized in that the gating circuit further includes
2N the 14th resistance, every one first electric switch passes through the 14th resistance and is connected to corresponding positive access point, each
Second electric switch passes through the 14th resistance and is connected to corresponding cathode access point.
7. more DC source input wires detection systems as described in claim 1, which is characterized in that more DC source inputs connect
Line detection system further includes accessory power supply, and the input terminal of the accessory power supply is connected to predetermined direct current source access point, and described auxiliary
The node of the input terminal and predetermined direct current source access point that help power supply is located at predetermined direct current source access point and the inversion
Between dc switch unit in device system, the output end of the accessory power supply is connected to the voltage end of the controller, described
The voltage end of controller is additionally coupled to the voltage conversion circuit in the inverter system, and the controller is in the dc switch
Voltage is received when unit disconnects from the accessory power supply, and after dc switch closure at the voltage conversion circuit
Receive voltage, wherein predetermined direct current source access point is N to a pair in DC source access point.
8. more DC source input wires detection systems as described in claim 1, which is characterized in that more DC source inputs connect
Line detection system further includes record storage module, and the record storage module is used for according to the abnormality detection result record storage
Wiring error information, the controller are also used to obtain the wiring error information after recognizing the DC source and powering on, and
Show the wiring error information.
9. more DC source input wires detection systems as described in claim 1, which is characterized in that more DC source inputs connect
Line detection system further includes alarm unit, and the controller is connected to the alarm unit, with determine the sampled voltage with
Difference between predeterminated voltage controls the alarm unit when exceeding in preset range and is warned.
10. a kind of photovoltaic string type inverter system, including N number of DC source, inverter system and the inspection of more DC source input wires
Examining system, the inverter system include N to DC source access point, and N number of DC source is connected to the N and accesses to DC source
Point, more DC source input wires detection systems are connected to N to DC source access point, be activated detect later it is N number of straight
Stream source and the N are to the wiring condition between DC source access point, wherein each pair of DC source access point includes an anode access
Point and a cathode access point, the wiring detection system include gating circuit, sample circuit, controller and alarm unit, institute
Stating gating circuit includes N number of first electric switch and N number of second electric switch, and N number of first electric switch and N number of positive access point one are a pair of
It should connect, N number of second establishes by cable and connect one to one with N number of cathode access point, and N is the natural number more than or equal to 2；
The controller connects N number of first electric switch and N number of second electric switch, for after the wiring detection system is activated
Successively gate every one first electric switch in N number of first electric switch, and successively gate simultaneously in N number of second electric switch every 1
Two electric switches, wherein only gate first electric switch and second electric switch each time, and gated simultaneously first and
The corresponding positive access point of second electric switch is the access point of different DC sources from cathode access point；
The sample circuit is connected to N number of first electric switch and N number of second electric switch, with the controller to described first and
Corresponding voltage sample is carried out after second electric switch gating, to obtain corresponding first sampled voltage；
The controller is additionally coupled to the sample circuit, for determining between first sampled voltage and predeterminated voltage
Output abnormality testing result when difference is beyond in preset range, with show the corresponding DC source of first sampled voltage with it is corresponding
There are wrong line situations between DC source access point.
11. photovoltaic string type inverter system as claimed in claim 10, which is characterized in that more DC source input wires
Detection system further includes ground insulation impedance detection circuit, and the ground insulation impedance detection circuit includes first resistor, second
Resistance, 3rd resistor, the 4th resistance, third electric switch, the 4th electric switch and the 5th electric switch, the first end of the first resistor
Be connected to every one first electric switch, the second end of the first resistor pass sequentially through the described second to the 4th resistance be connected to it is each
Second electric switch, the node between second and third described resistance are grounded by the third electric switch, the 4th electric switch
The both ends of the first resistor are connected in parallel on, the 5th electric switch is connected in parallel on the both ends of the 4th resistance；
The sample circuit includes the first difference channel and the second difference channel, and two input terminals of first difference channel are used for
Obtain first and second described ohmically voltage, two input terminals of second difference channel are for obtaining the third and the
Four ohmically voltages, the output end of first and second difference channel are connected to the controller；
The controller is additionally coupled to the third to the 5th electric switch, and the controller is also used in first gated simultaneously
And second the corresponding positive access point of electric switch and cathode access point for different DC sources access point when, control the third extremely
5th electric switch disconnects, and the controller is also used to successively gate every one first electric switch in N number of first electric switch, and simultaneously
Successively gate every one second electric switch of N number of second electric switch, wherein only gate first electric switch and one each time
Two electric switches, and the corresponding positive access point of first and second electric switch and cathode access point that are gated simultaneously are same direct current
A pair of of access point in source, while it being successively alternately closed the 4th electric switch and the 5th electric switch, and third electric switch is kept to locate always
In closed state, with the ground insulation resistance of the corresponding DC source of determination；
The controller is also used to determine the anode access of corresponding DC source according to the ground insulation resistance of determining DC source
Voltage between point and the cathode access point of other each DC sources, using as the predeterminated voltage.
12. photovoltaic string type inverter system as claimed in claim 11, which is characterized in that first difference channel includes
First operational amplifier, the 6th resistance, the 7th resistance, the 8th resistance and the 9th resistance, the first of first operational amplifier
Input terminal is connected to the first end of the first resistor by the 6th resistance, and the first input end of first operational amplifier is also
It is connected to voltage end by the 7th resistance, the second input terminal of first operational amplifier is connected to by the 8th resistance
Second input terminal of the node between the second resistance and 3rd resistor, first operational amplifier also passes through the described 9th
Resistance is connected to the output end of first operational amplifier；
Second difference channel includes second operational amplifier, the tenth resistance, eleventh resistor, twelfth resistor and the 13rd
Resistance, the first input end of the second operational amplifier by the tenth resistance be connected to the second resistance and 3rd resistor it
Between node, the first input end of the second operational amplifier is also connected to the voltage end by the eleventh resistor,
Second input terminal of the second operational amplifier is connected to second electric switch, second operation by twelfth resistor
Second input terminal of amplifier is also connected to the output end of the second operational amplifier by the thirteenth resistor, and described
One and the output end of second operational amplifier be connected to the controller.
13. photovoltaic string type inverter system as claimed in claim 12, which is characterized in that the 6th resistance and described the
The resistance value of ten resistance is equal, and the 7th resistance is equal with the resistance value of the eleventh resistor, the 8th resistance and described the
The resistance value of 12 resistance is equal, and the 9th resistance is identical as the resistance value of the thirteenth resistor, the first resistor with it is described
The resistance value of 4th resistance is equal, and the second resistance is equal with the resistance value of the 3rd resistor.
14. photovoltaic string type inverter system as claimed in claim 10, which is characterized in that the inverter system further includes
Dc switch unit and voltage conversion circuit, the wiring detection system further includes accessory power supply, the dc switch unit packet
2N switch is included, the positive access point and cathode access point of each pair of DC source pass through a switch and connect the voltage conversion electricity
Road, the input terminal of the accessory power supply are connected to predetermined direct current source access point, and the input terminal of the accessory power supply with it is described pre-
The node of DC source is determined between the predetermined direct current source and the dc switch unit, and the output end of the accessory power supply connects
It is connected to the voltage end of the controller, the voltage end of the controller is additionally coupled to the voltage conversion circuit, the controller
Voltage is received at the accessory power supply when the dc switch unit is disconnected, and from described after dc switch closure
Voltage is received at voltage conversion circuit, wherein predetermined direct current source access point is N to a pair in DC source access point.
15. photovoltaic string type inverter system as claimed in claim 14, which is characterized in that the controller is for successively selecting
Lead to N number of first electric switch, and successively gate N number of second electric switch simultaneously, wherein each time only gate first electric switch and
One the second electric switch, and the corresponding positive access point of first and second electric switch and cathode access point that are gated simultaneously are same
The access point of one DC source；
The sample circuit is also used to carry out corresponding voltage after the controller is to first and second described electric switch gating
Sampling, to obtain corresponding second sampled voltage, the controller is also used to obtain each pair of of the voltage conversion circuit output
Reference voltage between DC source access point stops starting when second sampled voltage is matched with corresponding reference voltage
The wiring detection system starts the wiring detection system when sampled voltage is mismatched with corresponding reference voltage.
16. photovoltaic string type inverter system as claimed in claim 14, which is characterized in that the photovoltaic string type inverter
System further includes N number of immunity module and N number of lightning-protection module, every a pair of DC source access point pass through an immunity module and
One lightning-protection module is connected to the corresponding switch of the dc switch unit.
17. photovoltaic string type inverter system as claimed in claim 10, which is characterized in that more DC source input wires
Detection system further includes record storage module, and the record storage module is used to carry out record according to the abnormality detection result to deposit
Wiring error information is stored up, the controller is also used to obtain the wiring error information after recognizing the DC source and powering on,
And show the wiring error information.
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| WO2022155883A1 (en) * | 2021-01-22 | 2022-07-28 | 华为数字能源技术有限公司 | Detection method and related device |
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| CN113687128B (en) * | 2021-09-08 | 2024-05-14 | 阳光电源股份有限公司 | Current detection method, device and equipment of photovoltaic PID (proportion integration differentiation) suppression circuit |
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