CN101572413B - Low-voltage line voltage compensating device and compensating method thereof - Google Patents
Low-voltage line voltage compensating device and compensating method thereof Download PDFInfo
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- CN101572413B CN101572413B CN200910062522.3A CN200910062522A CN101572413B CN 101572413 B CN101572413 B CN 101572413B CN 200910062522 A CN200910062522 A CN 200910062522A CN 101572413 B CN101572413 B CN 101572413B
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Abstract
The invention relates to a low-voltage line voltage compensating device and a compensating method thereof. The device comprises a by-pass switch, a voltage measuring module, and a voltage series module. The device is characterized by also comprising an isolating transformer and an alternating current chopper module. The connection relation comprises that a low-voltage line, the isolating transformer and the alternating current chopper module are electrically connected in turn; the alternating current chopper module is electrically connected with the voltage measuring module and the voltage series module respectively; the voltage series module and the by-pass switch are connected in parallel and then are electrically connected with a load respectively; and the voltage measuring module is electrically connected with the low-voltage line. The primary side firing line of a step-down transformer is connected to a non-dotted terminal of a secondary side. By taking electricity from the low-voltage line through the isolating transformer, the voltage value of the alternating current chopper module measured by the voltage measuring module generates a compensating voltage, and then the compensating voltage is sent to the voltage series module so as to ensure the voltage acquired by the load in a range of standard value. The method adopts power-electronics alternating current chopper technology and voltage series compensating modes to control and stabilize the voltage at the tail end of the low-voltage line in the standard range, and solves the problem of low and unstable voltage of the low-voltage line due to long-distance power transmission.
Description
Technical field
The present invention relates to a kind of low-voltage line voltage compensating device and compensation method thereof, to be applicable in power distribution network, solve low-voltage circuit through compared with the low voltage problem after long distance power delivery.
Background technology
" rural area low-voltage power technical regulation " specifies: the radius of electricity supply of low-voltage platform area electrical network is generally no more than 500 meters.But in Rural Power Distribution Network, due to the dispersiveness of power consumer distribution, there is the less and situation of radius of electricity supply more than 500 meters of load unavoidably.Because load is less, be difficult to give user with 10kV medium-voltage line by electric power, so selection low-voltage circuit is powered from the consideration of economic benefit; But low-voltage circuit is through the power transmission of long-distance, terminal voltage can fluctuate on a large scale along with the change of customer charge, can not meet the normal electricity consumption needs of user.
More existing devices that low-voltage network voltage is compensated at present, to improve rural power grids power supply quality and to reduce investment, but still have its weak point, as patent CN200410083143.X " voltage compensating device " comprises voltage detection department, compensating circuit, control part, circuit breaker and short switch, the bucking voltage that compensating circuit exports to be superimposed on supply voltage and compensating load by this device, when the circuit breaker being located at upstream disconnects, fast detecting also stops unwanted voltage compensation action; The voltage detection department detecting supply voltage possesses the device of the phase place detecting supply voltage, detects supply voltage phase place and exceed ormal weight than reference phase and change in compensating movement, then judge that upstream circuit breaker is off, terminate compensating movement.The voltage generator of this patented technology mainly carries out inversion by DC power supply and is converted to alternating current, is then loaded into line voltage, and sport technique segment is complicated, and cost is higher.This patent is that the phase place by detecting supply voltage judges to compensate whether this terminates than the change that the phase place of reference voltage exceedes ormal weight, and not using the effective value of line voltage whether lower than national standard as criterion.
And in patent CN200620036663.X " digital low-voltage compensating device ", after the indirect energy-storage units of main circuit voltage input and output side, parallel IGBT boost chopper module, then series IGBT afterflow module and output filter circuit; Establish containing sampling in control loop, compare, adjustable feedback unit, single-chip microcomputer makes control circuit, IGBT drive circuit, finally connects the G pole of each IGBT switch element of major loop.Voltage compensating device in this patent needs to bear customer charge completely, so relatively little, the required installed capacity of device institute on-load is relatively large, equipment cost and fail safe certainly will be greatly affected; Device need hang between grid side and user side always, increases the loss of electrical network to a certain extent, once device breaks down, power supply stops, so power supply reliability is poor.
Summary of the invention
The object of the present invention is to provide a kind of low-voltage line voltage compensating device and compensation method thereof, it solve low voltage and instability problem that low-voltage circuit causes due to long distance power delivery, both meet the cost-effectiveness requirement of electric power conveying, meet again the requirement of user to quality of voltage.
Technical scheme of the present invention is: a kind of low-voltage line voltage compensating device, comprises by-pass switch, it is characterized in that: also comprise isolating transformer, AC chopping module, voltage measurement module, Voltage Series module; Its annexation is: low-voltage circuit, isolating transformer and AC chopping module are electrically connected successively, AC chopping module is also electrically connected voltage measurement module and Voltage Series module respectively, be electrically connected with load respectively after Voltage Series module and by-pass switch parallel connection, voltage measurement module electrical connection low-voltage circuit, the live wire on the former limit of step-down transformer is connected to the non-same polarity of secondary.
Low-voltage line voltage compensating device as above, is characterized in that: adopt MSP430 series 16 single-chip microcomputers in AC chopping module.
Low-voltage line voltage compensating device as above, is characterized in that: AC chopping module adopts 4 IGBT being with fly-wheel diode, forms two two-way power switch; Each IGBT buffer circuit in parallel.
Low-voltage line voltage compensating device as above, is characterized in that: isolating transformer is step-down transformer, its secondary ac capacitor in parallel.
A kind of compensation method of low-voltage line voltage compensating device, it is characterized in that: adopt power electronics AC wave chopping technology and Voltage Series compensation technique, by isolating transformer to low-voltage circuit power taking, the live wire on former for isolating transformer limit is connected to the non-same polarity of secondary, isolating transformer not only plays buffer action, plays transformer series compensating action simultaneously; The magnitude of voltage that AC chopping module is recorded by voltage measurement module, produce bucking voltage and deliver to Voltage Series module, the voltage that guaranteed load obtains is in standard value range.
The compensation method of low-voltage line voltage compensating device as above, is characterized in that: adopt the incomplementarity control mode that no current detects, the on off state of 4 IGBT in the positive and negative half period of front end line voltage in AC chopping module is asymmetric.
The compensation method of low-voltage line voltage compensating device as above, is characterized in that: adopt open loop control mode, and the voltage at the load place after compensating without the need to sampling, detects front end line voltage, produce corresponding bucking voltage.
The compensation method of low-voltage line voltage compensating device as above, it is characterized in that: the control mode of IGBT adopts the pulse-width modulation circuit of duty ratio modulation, the cycle of each control impuls is fixed, and the ratio of the bucking voltage that duty ratio exports according to device and line voltage distribution adjusts.
The invention has the beneficial effects as follows: adopt power electronics AC wave chopping technology and Voltage Series compensation way to be controlled to be stabilized in critical field by low-voltage circuit terminal voltage, solve low voltage and instability problem that low-voltage circuit causes due to long distance power delivery.
1, the present invention introduces line voltage by a step-down isolation transformer, and then carry out discharge and recharge by AC chopping module to electric capacity, be finally connected in series to electric capacity both end voltage to reach the object of booster tension on electrical network, structure is simple.Use power electronics AC wave chopping technology.
2, whether the present invention mainly judges to compensate whether this terminates, criterion is clear and definite lower than national standard by the effective value of detection of grid voltage.
3, the present invention is connected on electrical network after mainly utilizing capacitance energy storage, thus reaches and promote the object of line voltage, and patent CN200620036663.X is then simple by IGBT boost chopper lifting system voltage.
2, the present invention is just for user provides the voltage of a very little part, and most voltage still takes from system side, so this device institute on-load is larger.
3, the present invention is using line voltage as the foundation of voltage compensation, line voltage is lower then also higher by the voltage of AC chopping module for compensating, patent CN200620036663.X is then according to user side voltage as compensation basis, by cut-offfing of feedback unit control IGBT boost chopper module.
4, the present invention carries intelligent voltage detection control, when line voltage is normal, device can run by dropping into bypass automatically, AC chopping module from service, when detecting that line voltage is too low, then disconnect bypass, through AC chopping module and Voltage Series module raises line voltage, period user can not have a power failure.
5, the present invention has self-inspection error correction, automatically can jump to bypass to run when breaking down in device inside, device is stopped transport or is restarted, can ensure that user does not have a power failure, and the compensation arrangement in patent CN200620036663.X is directly connected on electrical network and subscriber's line, during plant failure, customer power supply is certain to receive impact.
Accompanying drawing explanation
Fig. 1 embodiment of the present invention apparatus structure schematic diagram.
Fig. 2 embodiment of the present invention device circuit schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
The explanation marked in Fig. 1: 1-low-voltage circuit, 2-isolating transformer, 3-AC chopping module, 4-voltage measurement module, 5-Voltage Series module, 6-by-pass switch, 7-load.
The explanation marked in Fig. 2: S1-inputs circuit breaker, and S2-bypass breaker (i.e. 6 in Fig. 1), S3-exports circuit breaker, C1-electric capacity, L1-inductance.
As depicted in figs. 1 and 2, embodiment of the present invention low-voltage line voltage compensating device comprises isolating transformer 2, AC chopping module 3, voltage measurement module 4, Voltage Series module 5, by-pass switch 6, input circuit breaker S1 and output circuit breaker S3; Its annexation is: low-voltage circuit 1, isolating transformer 2 and AC chopping module 3 are electrically connected successively; AC chopping module 3 is also electrically connected voltage measurement module 4 and Voltage Series module 5 respectively; Voltage Series module 5 other end is electrically connected load 7 and by-pass switch 6 respectively by exporting circuit breaker S3, and wherein by-pass switch 6 is in parallel with Voltage Series module 5; Low-voltage circuit 1 is electrically connected isolating transformer 2 and voltage measurement module 4 respectively by input circuit breaker S1.
The embodiment of the present invention is by isolating transformer 2 to low-voltage circuit 1 power taking, and the magnitude of voltage that AC chopping module 3 is recorded by voltage measurement module 4, produce bucking voltage and deliver to Voltage Series module 5, the voltage that guaranteed load 7 obtains is in standard value range.When line voltage distribution on the upside of Voltage Series module 5 in standard value range or plant failure time, AC chopping module 3 sends instruction makes it close to by-pass switch 6, embodiment of the present invention device (stopping bucking voltage) out of service, circuit is powered to load 7 through by-pass switch 6, and guaranteed load 7 does not have a power failure.
When power is normal, closes bypass switch 6, stopping bucking voltage; When voltage measurement module 4 detects that supply voltage declines, AC chopping module 3 sends instruction makes it disconnect to by-pass switch 6, is switched to the bucking voltage supply electric power by Voltage Series module 5; AC chopping module 3 exports bucking voltage, and the superposition of this bucking voltage on the supply voltage, supplies load 7.
The embodiment of the present invention is based on power electronic technology, and along with the fast development of power electronic technology, the increase of IGBT device capacity and the reduction of cost, the voltage compensation based on power electronic technology can realize the object of AC voltage adjusting with less switching device.
The embodiment of the present invention is series at electrical network, when Voltage Drop, the only part of compensation network Voltage Drop, maintains the load voltage value of loading nose voltage at 220V, and do not need the voltage that 220V is provided to load completely, therefore the power of the embodiment of the present invention is less than bearing power.
The embodiment of the present invention is with by-pass switch 6, and during the normal or plant failure of line voltage distribution, electrical network is powered to load 7 through bypass, keeps that load is not tripped, not power down.
Not altogether, therefore device input is by isolating transformer 2 and the isolation of electrical network end for the output voltage of the embodiment of the present invention and line voltage.Isolating transformer 2 is step-down transformer, can reduce the electric pressure requirement of IGBT in device.Isolating transformer 2 secondary ac capacitor C1 in parallel, the reactive power consumption of compensation arrangement.Input, and to be isolated with upside circuit to power taking on the upside of circuit by isolating transformer 2.
AC chopping module 3 adopts 4 IGBT being with fly-wheel diode, forms two two-way power switch, all can carry out Regulation Control at the positive and negative half-wave of voltage waveform.
The control mode of the embodiment of the present invention adopts the incomplementarity control mode of no current detection; the on off state of 4 IGBT in the positive and negative half period of embodiment of the present invention front end line voltage in AC chopping module 3 is asymmetric; which provides safe and effective continuous current circuit for the filter inductance L1 in Voltage Series module 5, can the safety in utilization of available protecting IGBT.
The embodiment of the present invention adopts open loop control mode, and the voltage at load 7 place after compensating without the need to sampling, detect embodiment of the present invention front end line voltage, produce corresponding bucking voltage, this control mode is simple.
The control mode of IGBT adopts the pulse-width modulation circuit of duty ratio modulation.The cycle of each control impuls is fixed, and the ratio of the bucking voltage that duty ratio exports according to device and line voltage distribution adjusts.Which fast response time, and output voltage fluctuation is little.
Each IGBT buffer circuit in parallel, absorbs the due to voltage spikes produced when IGBT turns off, protects more fully for IGBT provides.
MSP430 series 16 single-chip microcomputers are adopted in the AC chopping module 3 of the embodiment of the present invention, this single-chip microcomputer adopts reduced instruction set computer, there is abundant addressing system, succinct core instructions, instruction execution speed is fast, Embedded more interrupt source and peripheral module, save design cost, desin speed is provided.And this single-chip microcomputer has power consumption considerably.
Claims (8)
1. a low-voltage line voltage compensating device, comprises by-pass switch, voltage measurement module, Voltage Series module; It is characterized in that: also comprise isolating transformer and AC chopping module, its annexation is: low-voltage circuit, isolating transformer and AC chopping module are electrically connected successively, AC chopping module is also electrically connected voltage measurement module and Voltage Series module respectively, be electrically connected with load respectively after Voltage Series module and by-pass switch parallel connection, voltage measurement module electrical connection low-voltage circuit, the live wire on the former limit of isolating transformer is connected to the non-same polarity of secondary.
2. low-voltage line voltage compensating device according to claim 1, is characterized in that: adopt MSP430 series 16 single-chip microcomputers in AC chopping module.
3. low-voltage line voltage compensating device according to claim 1, is characterized in that: AC chopping module adopts 4 IGBT being with fly-wheel diode, forms two two-way power switch; Each IGBT buffer circuit in parallel.
4. low-voltage line voltage compensating device according to claim 1, is characterized in that: isolating transformer is step-down transformer, its secondary ac capacitor in parallel.
5. the compensation method of a low-voltage line voltage compensating device, it is characterized in that: adopt power electronics AC wave chopping technology and Voltage Series compensation technique, by isolating transformer to low-voltage circuit power taking, the live wire on former for isolating transformer limit is connected to the non-same polarity of secondary, isolating transformer not only plays buffer action, plays transformer series compensating action simultaneously; Low-voltage circuit, isolating transformer and AC chopping module are electrically connected successively, and AC chopping module is also electrically connected voltage measurement module and Voltage Series module respectively; The supply voltage value that AC chopping module is recorded by voltage measurement module, produce bucking voltage and deliver to Voltage Series module, the voltage that guaranteed load obtains is in standard value range.
6. the compensation method of low-voltage line voltage compensating device according to claim 5, it is characterized in that: adopt the incomplementarity control mode that no current detects, the on off state of 4 IGBT in the positive and negative half period of front end line voltage in AC chopping module is asymmetric.
7. the compensation method of low-voltage line voltage compensating device according to claim 5, is characterized in that: adopt open loop control mode, and the voltage at the load place after compensating without the need to sampling, detects front end line voltage, produce corresponding bucking voltage.
8. the compensation method of low-voltage line voltage compensating device according to claim 6, it is characterized in that: the control mode of IGBT adopts the pulse-width modulation circuit of duty ratio modulation, the cycle of each control impuls is fixed, and the ratio of the bucking voltage that duty ratio exports according to device and line voltage distribution adjusts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910062522.3A CN101572413B (en) | 2009-06-05 | 2009-06-05 | Low-voltage line voltage compensating device and compensating method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910062522.3A CN101572413B (en) | 2009-06-05 | 2009-06-05 | Low-voltage line voltage compensating device and compensating method thereof |
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| Publication Number | Publication Date |
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| CN101572413A CN101572413A (en) | 2009-11-04 |
| CN101572413B true CN101572413B (en) | 2015-01-14 |
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| CN200910062522.3A Expired - Fee Related CN101572413B (en) | 2009-06-05 | 2009-06-05 | Low-voltage line voltage compensating device and compensating method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106684876A (en) * | 2017-01-21 | 2017-05-17 | 河北郎尊电力科技有限公司 | Tail-end low-voltage compensation device of rural power grid |
| CN107425711A (en) * | 2017-03-30 | 2017-12-01 | 苏州市职业大学 | A kind of high efficiency energy two-way DC converter and control method |
| CN108365605A (en) * | 2018-03-08 | 2018-08-03 | 西安爱科赛博电气股份有限公司 | A kind of low-voltage network three-phase line low-voltage governing system and method |
| CN112035784B (en) * | 2020-07-16 | 2024-04-09 | 中国电力科学研究院有限公司 | Method and system for determining loss of low-voltage transformer area based on electricity consumption acquisition data |
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