CN109725202B - Multi-path MPPT insulation impedance detection device and method - Google Patents
Multi-path MPPT insulation impedance detection device and method Download PDFInfo
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Abstract
The invention is suitable for the technical field of photovoltaic inverters and provides a multi-path MPPT insulation impedance detection device and a multi-path MPPT insulation impedance detection method, wherein the device comprises a booster circuit, a controller and an insulation impedance detection circuit; the multichannel photovoltaic inverter includes: a plurality of photovoltaic inputs; the plurality of the boosting circuits are connected with the plurality of the photovoltaic input ends in a one-to-one correspondence manner, and the photovoltaic input ends are connected with the direct current bus through the corresponding boosting circuits; the controller is respectively connected with the switching tubes of the booster circuits and is used for controlling the on-off of the booster circuits; and the insulation impedance detection circuit is connected with the direct current bus and used for detecting the insulation impedance of the photovoltaic input end to be detected. The multi-path MPPT insulation impedance detection device provided by the invention boosts the input voltage of the corresponding photovoltaic input end through the booster circuit, and can realize the detection of the insulation impedance to the ground of other photovoltaic input ends except the photovoltaic input end with the maximum photovoltaic input voltage.
Description
Technical Field
The invention belongs to the technical field of photovoltaic inverters, and particularly relates to a multi-path MPPT insulation impedance detection device and method.
Background
Safety regulations require that a photovoltaic grid-connected inverter detects the ground insulation impedance between a photovoltaic input end and the ground before grid connection. For a photovoltaic inverter with multiple MPPT (Maximum Power Point Tracking), at present, only the insulation impedance of a branch with a higher input voltage at a photovoltaic input end can be detected, and the insulation impedance to ground of other photovoltaic input ends cannot be detected.
Disclosure of Invention
The invention aims to provide a multi-path MPPT insulation impedance detection method, and aims to solve the technical problem that insulation impedance to the ground of other photovoltaic input ends except a photovoltaic input end with the maximum photovoltaic input voltage cannot be detected in the prior art.
A first aspect of an embodiment of the present invention provides a multi-path MPPT insulation resistance detection apparatus, including: the device comprises a booster circuit, a controller and an insulation resistance detection circuit;
the multi-path MPPT includes: a plurality of photovoltaic inputs;
the plurality of the boosting circuits are connected with the plurality of the photovoltaic input ends in a one-to-one correspondence manner, and the photovoltaic input ends are connected with the direct current bus through the corresponding boosting circuits;
the controller is respectively connected with each booster circuit and is used for selecting an input end to be detected according to a preset rule, wherein the input end to be detected is any one of the photovoltaic input ends which are not subjected to insulation impedance detection; the photovoltaic power generation circuit is also used for generating a control signal and sending the control signal to a booster circuit correspondingly connected with the photovoltaic input end to be detected;
the boost circuit is correspondingly connected with the photovoltaic input end to be detected and used for boosting the input voltage of the input end to be detected to a first boost voltage according to the control signal and boosting the voltage of the direct current bus to the first boost voltage;
and the insulation impedance detection circuit is connected with the direct current bus and used for detecting the input end to be detected to obtain a single-path detection result.
Further, multichannel MPPT insulation resistance detection device, still include: a voltage comparison circuit;
the voltage comparison circuit is used for comparing the input voltage of each photovoltaic input end and sending a comparison result to the controller;
and the controller is also used for selecting the photovoltaic input end with the largest input voltage from the photovoltaic input ends which are not subjected to insulation impedance detection as the input end to be detected according to the comparison result.
Further, the booster circuit includes: the energy storage unit, the switching tube and the rectifying unit;
the positive electrode of the photovoltaic input end is connected with the positive electrode of the direct current bus through the energy storage unit and the rectification unit in sequence;
the common end of the energy storage unit and the rectifying unit is connected with the negative electrode of the photovoltaic input end through the switch tube;
and the negative electrode of the photovoltaic input end is connected with the negative electrode of the direct current bus.
Further, the rectifying unit is a diode;
and the anode of the diode is connected with the energy storage unit, and the cathode of the diode is connected with the anode of the direct current bus.
Further, the switch tube is an IGBT tube;
the base electrode of the IGBT tube is connected with the controller, the collector electrode of the IGBT tube is connected with the common end of the energy storage unit and the rectifying unit, and the emitter electrode of the IGBT tube is connected with the negative electrode of the photovoltaic input end.
Further, the energy storage unit is an inductor;
one end of the inductor is connected with the anode of the photovoltaic input end, and the other end of the inductor is connected with the common end of the switching tube and the rectifying unit.
A second aspect of embodiments of the present invention provides a photovoltaic inverter, comprising: the multi-way MPPT insulation resistance detection apparatus according to any one of the first aspect.
A second aspect of the embodiments of the present invention provides a multi-path MPPT insulation resistance detection method, including:
selecting an input end to be detected according to a preset rule, wherein the input end to be detected is any one of the photovoltaic input ends which are not subjected to insulation impedance detection;
the input voltage of the input end to be tested is raised to a first boosted voltage through a booster circuit, and the voltage of a direct current bus is raised to the first boosted voltage;
and detecting the input end to be detected through the insulation impedance detection circuit to obtain a single-path detection result.
Further, before selecting any one of the photovoltaic input ends which are not subjected to insulation impedance detection as an input end to be tested, the method further comprises the following steps:
and the insulation impedance detection circuit performs insulation impedance detection on the photovoltaic input end with the maximum input voltage to obtain a single-path detection result.
Further, according to the preset rule, selecting any one of the photovoltaic input ends which are not subjected to insulation impedance detection as an input end to be detected, includes:
comparing the magnitude of the input voltage of each photovoltaic input end which is not subjected to insulation impedance detection;
and selecting the photovoltaic input end with the largest input voltage in the photovoltaic input ends which are not subjected to insulation impedance detection as the input end to be detected according to the comparison result.
The multi-path MPPT insulation impedance detection device and method provided by the embodiment of the invention have the beneficial effects that: according to the multi-path MPPT insulation impedance detection device provided by the embodiment of the invention, the photovoltaic input voltage of the branch to be detected is boosted through the boosting circuit, in the boosting process, the photovoltaic input voltage is boosted to be greater than the bus voltage, the photovoltaic input end of the branch to be detected is conducted with the direct-current bus, the first boosted voltage obtained through boosting is taken as the current bus voltage, at the moment, the photovoltaic input voltage of the input end to be detected can be detected through the insulation impedance detection circuit, the detection result of the ground insulation impedance of the photovoltaic input end of the branch to be detected is obtained, and the ground insulation impedance of other photovoltaic input ends except the photovoltaic input end with the maximum photovoltaic input voltage can be detected.
Drawings
Fig. 1 is a schematic structural diagram of a multi-path MPPT insulation resistance detection apparatus according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a voltage boost circuit according to an embodiment of the present invention;
fig. 3 is a flowchart of a multi-way MPPT insulation resistance detection method according to an embodiment of the present invention.
Reference numerals:
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The specific embodiment is as follows:
referring to fig. 1, fig. 1 is a multi-way MPPT insulation resistance detection apparatus according to an embodiment of the present invention, which may include: a booster circuit 10, a controller 30, and an insulation resistance detection circuit 20;
the multi-path MPPT includes: a plurality of photovoltaic inputs;
the plurality of boosting circuits 10 are connected with the plurality of photovoltaic input ends in a one-to-one correspondence manner, and the photovoltaic input ends are connected with the direct current bus through the corresponding boosting circuits 10;
the controller 30 is connected to each of the boost circuits 10, and is configured to select an input end to be tested according to a preset rule, where the input end to be tested is any one of the photovoltaic input ends that are not subjected to insulation impedance detection; the photovoltaic power generation circuit is also used for generating a control signal and sending the control signal to the booster circuit 10 correspondingly connected with the photovoltaic input end to be detected;
the boosting circuit 10 is correspondingly connected with the photovoltaic input end to be detected and used for boosting the input voltage of the input end to be detected to a first boosting voltage according to the control signal and boosting the voltage of the direct current bus to the first boosting voltage;
and the insulation impedance detection circuit 20 is connected with the direct current bus and used for detecting the input end to be detected to obtain a single-path detection result.
The working process of the multi-path MPPT insulation impedance detection device is as follows: the controller 30 selects the input end to be tested, and controls the boost circuit 10 of the branch where the input end to be tested is located to boost the input voltage until the input end to be tested is conducted with the direct current bus through the boost circuit 10, that is, the boosted voltage can cover the original bus voltage, so that the boosted voltage is used as the current bus voltage. The insulation resistance detection circuit 20 detects the insulation resistance to ground of the branch where the input terminal to be tested is located under the control of the controller 30.
The multichannel MPPT insulation resistance detection device that this embodiment provided can realize detecting the insulation resistance to ground of other photovoltaic input ends except the photovoltaic input end of maximum photovoltaic input voltage.
Another embodiment of the present invention provides a multi-MPPT insulation resistance detection apparatus, further including: a voltage comparison circuit.
The voltage comparison circuit is configured to compare the magnitude of the input voltage at each photovoltaic input terminal, and send the comparison result to the controller 30.
The controller 30 is further configured to select, according to the comparison result, a photovoltaic input end with the largest input voltage among the photovoltaic input ends that are not subjected to insulation impedance detection as an input end to be detected.
Referring to fig. 2, fig. 2 is a circuit diagram of the voltage boost circuit 10, and in a specific embodiment, the voltage boost circuit 10 includes: the energy storage unit, the switching tube G and the rectifying unit.
And the positive electrode of the photovoltaic input end is connected with the positive electrode of the direct current bus through the energy storage unit and the rectification unit in sequence.
And the common end of the energy storage unit and the rectifying unit is connected with the negative electrode of the photovoltaic input end through the switching tube G.
And the negative electrode of the photovoltaic input end is connected with the negative electrode of the direct current bus.
Optionally, the rectifying unit is a diode D.
And the anode of the diode D is connected with the energy storage unit, and the cathode of the diode D is connected with the anode of the direct current bus.
Optionally, the switching tube G is an IGBT tube.
The base electrode of the IGBT tube is connected with the controller 30, the collector electrode of the IGBT tube is connected with the common end of the energy storage unit and the rectifying unit, and the emitter electrode of the IGBT tube is connected with the negative electrode of the photovoltaic input end.
Optionally, the energy storage unit is an inductor L.
One end of the inductor L is connected with the anode of the photovoltaic input end, and the other end of the inductor L is connected with the switch tube G and the common end of the rectifying unit.
An embodiment of the present invention provides a photovoltaic inverter including: the multi-path MPPT insulation resistance detection device of any one of the above.
Optionally, as shown in fig. 1, the photovoltaic inverter includes: the MPPT system comprises a plurality of MPPT insulation impedance detection devices, a bus capacitor and an inverter circuit;
wherein, the positive pole of the direct current bus is connected with the negative pole of the direct current bus through the bus capacitor 40. The first output end of every MPPT branch road interconnect in the multichannel MPPT, and the tie point with inverter circuit's first input end is connected, the second output end interconnect of every MPPT branch road in the multichannel MPPT, and the tie point with inverter circuit's second input is connected.
Referring to fig. 3, fig. 3 is a schematic flowchart of a multi-way MPPT insulation resistance detection method according to an embodiment of the present invention. The method in this embodiment may include:
Optionally, according to the preset rule, the photovoltaic input end with the highest or lowest voltage may be selected as the input end to be tested according to the magnitude of the input voltage of each photovoltaic input end.
One end of each photovoltaic input end is connected in parallel to the direct current bus, the photovoltaic input end with the highest input voltage is communicated with the direct current bus through the booster circuit 10, and the rest photovoltaic input ends are isolated. Therefore, the ground insulation resistance of the multi-path photovoltaic inverter can be detected, and only the ground insulation resistance of the conducting branch can be detected.
Optionally, the boost circuit 10 corresponding to the input terminal to be tested boosts the input voltage of the input terminal to be tested under the control of the controller 30, and when the input voltage is boosted to be greater than the bus voltage of the dc bus, the boost circuit 10 is turned off under the control of the controller 30 to obtain a first boost voltage, and the first boost voltage covers the original bus voltage as the current bus voltage.
Optionally, the boosting process of the multi-way MPPT insulation resistance detection apparatus shown in fig. 1 may be: the controller 30 sends a control signal to the switching tube G to control the switching tube G to be conducted, so that the input voltage of the input end to be tested is loaded on the inductor L, the current is gradually increased, the control signal can be a pulse width modulation signal with a preset duty ratio, the switching tube G is turned off after a preset time, the polarity of the inductor L is inverted, the input voltage of the input end to be tested and the voltage of the inductor L are superposed to serve as a first boost voltage, the first boost voltage is greater than the bus voltage, so that the diode D is conducted, and the first boost voltage serves as the current bus voltage.
When the first boosted voltage obtained by boosting the input terminal to be tested becomes the current bus voltage, the controller 30 controls the insulation impedance detection circuit 20 to detect the ground insulation impedance of the branch where the input terminal to be tested is located. And after the detection is finished, the switching tube G is always in a closed state under the control of the control signal. The detection of the insulation resistance to the ground of the rest branches is convenient to carry out in the same way subsequently.
In this embodiment, the photovoltaic input voltage of the branch circuit to be tested is boosted through the boost circuit 10, so that the photovoltaic input voltage of the branch circuit to be tested is communicated with the bus voltage, and further, the ground insulation impedance of other photovoltaic input ends except the photovoltaic input end with the maximum photovoltaic input voltage can be detected.
In one embodiment, before step 101, it may include:
step 100, the insulation impedance detection circuit 20 performs insulation impedance detection on the photovoltaic input end with the maximum input voltage to obtain a single-path detection result.
Since the photovoltaic input terminal with the largest input voltage is always conducted with the bus capacitor 40, and the bus voltage is related to the input voltage of the photovoltaic input terminal with the largest input voltage, the input voltage of the photovoltaic input terminal with the largest input voltage does not need to be boosted, and the ground insulation impedance of the branch circuit can be detected.
In this embodiment, it is not necessary to boost the input voltage through the boost circuit 10, and the ground impedance of the branch with the largest input voltage can be directly detected, so that the steps can be simplified, and the ground insulation impedance of the branch can be quickly obtained.
In another embodiment, after step 103, the method may further include:
and step 104, repeatedly executing the step 101 to the step 103 until all the photovoltaic input ends are detected, and obtaining each single-path detection result. Therefore, the detection of the ground insulation impedance of the multi-path photovoltaic inverter is more comprehensive, and a more complete detection result is obtained.
Another embodiment of the present invention provides a method for detecting insulation impedance of multi-path MPPT, including:
and step 201, comparing the magnitude of the input voltage of each photovoltaic input end without insulation resistance detection.
Step 202, according to the comparison result, the photovoltaic input end with the largest input voltage in the photovoltaic input ends which are not subjected to insulation impedance detection is selected as the input end to be detected.
Because the photovoltaic input end with the maximum input voltage can be boosted for a short time and can be larger than the bus voltage, the original bus voltage is covered, and the boosted voltage is used as the new bus voltage, so that the detection time can be saved and the detection progress is accelerated.
Step 203, the boost circuit 10 corresponding to the input end to be tested boosts the input voltage of the input end to be tested under the control of the controller 30 to obtain a first boost voltage, and the voltage of the dc bus is boosted to the first boost voltage.
And step 204, the insulation impedance detection circuit 20 detects the input end to be detected to obtain a single-path detection result.
Steps 203 to 204 in this embodiment are similar to steps 102 to 103 in the above embodiment, and are not described again here.
In this embodiment, by comparing the input voltages of the branches, the photovoltaic input terminal with the maximum input voltage in the untested branch is selected as the input terminal to be tested, so that the detection time can be saved, and the detection process can be accelerated.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. Multichannel MPPT insulation resistance detection device, its characterized in that includes: the device comprises a booster circuit, a controller and an insulation resistance detection circuit;
the multi-path MPPT includes: a plurality of photovoltaic inputs;
the plurality of the boosting circuits are connected with the plurality of the photovoltaic input ends in a one-to-one correspondence manner, and the photovoltaic input ends are used for being connected with the direct current bus through the corresponding boosting circuits;
the controller is respectively connected with each booster circuit and is used for selecting an input end to be detected according to a preset rule, wherein the input end to be detected is any one of the photovoltaic input ends which are not subjected to insulation impedance detection; the voltage boosting circuit is also used for generating a control signal and sending the control signal to the voltage boosting circuit correspondingly connected with the input end to be tested;
the boost circuit is correspondingly connected with the input end to be tested and used for boosting the input voltage of the input end to be tested to a first boost voltage according to the control signal and boosting the voltage of the direct current bus to the first boost voltage;
and the insulation impedance detection circuit is connected with the direct current bus and used for detecting the input end to be detected to obtain a single-path detection result.
2. The multi-way MPPT insulation resistance detection device of claim 1, further comprising: a voltage comparison circuit;
the voltage comparison circuit is used for comparing the input voltage of each photovoltaic input end and sending a comparison result to the controller;
and the controller is also used for selecting the photovoltaic input end with the largest input voltage from the photovoltaic input ends which are not subjected to insulation impedance detection as the input end to be detected according to the comparison result.
3. The multi-way MPPT insulation resistance detection device of claim 1, wherein the boost circuit comprises: the energy storage unit, the switching tube and the rectifying unit;
the positive electrode of the photovoltaic input end is connected with the positive electrode of the direct current bus through the energy storage unit and the rectification unit in sequence;
the common end of the energy storage unit and the rectifying unit is connected with the negative electrode of the photovoltaic input end through the switch tube;
and the negative electrode of the photovoltaic input end is connected with the negative electrode of the direct current bus.
4. The multi-way MPPT insulation resistance detection device of claim 3, wherein the rectification unit is a diode;
and the anode of the diode is connected with the energy storage unit, and the cathode of the diode is connected with the anode of the direct current bus.
5. The multi-way MPPT insulation resistance detection device according to claim 3, wherein the switching tube is an IGBT tube;
the base electrode of the IGBT tube is connected with the controller, the collector electrode of the IGBT tube is connected with the common end of the energy storage unit and the rectifying unit, and the emitter electrode of the IGBT tube is connected with the negative electrode of the photovoltaic input end.
6. The multi-way MPPT insulation impedance detection device of claim 3, wherein the energy storage unit is an inductor;
one end of the inductor is connected with the anode of the photovoltaic input end, and the other end of the inductor is connected with the common end of the switching tube and the rectifying unit.
7. Photovoltaic inverter, characterized in that it comprises a multiplex MPPT insulation resistance detection device according to any one of claims 1 to 6.
8. The multi-path MPPT insulation impedance detection method is characterized by comprising the following steps:
selecting an input end to be detected according to a preset rule, wherein the input end to be detected is any one of the photovoltaic input ends which are not subjected to insulation impedance detection;
the input voltage of the input end to be tested is raised to a first boosted voltage through a booster circuit, and the voltage of a direct current bus is raised to the first boosted voltage;
and detecting the input end to be detected through an insulation impedance detection circuit to obtain a single-path detection result.
9. The method for detecting multi-way MPPT insulation impedance of claim 8, wherein before said selecting an input terminal to be tested according to a preset rule, further comprising:
and the insulation impedance detection circuit performs insulation impedance detection on the photovoltaic input end with the maximum input voltage to obtain a single-path detection result.
10. The method for multi-way MPPT insulation impedance detection of claim 8, wherein the selecting an input terminal to be tested according to a predetermined rule comprises:
comparing the magnitude of the input voltage of each photovoltaic input end which is not subjected to insulation impedance detection;
and selecting the photovoltaic input end with the largest input voltage in the photovoltaic input ends which are not subjected to insulation impedance detection as the input end to be detected according to the comparison result.
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| CN110456154B (en) * | 2019-07-26 | 2021-09-14 | 华为技术有限公司 | Insulation resistance detection circuit and method |
| CN112379173A (en) * | 2020-11-25 | 2021-02-19 | 江苏为恒智能科技有限公司 | Direct current-to-ground insulation impedance detection circuit and method for variable bus voltage |
| EP4290764A4 (en) * | 2021-02-04 | 2024-03-06 | Huawei Digital Power Technologies Co., Ltd. | Impedance measurement method and photovoltaic system |
| CN113252980A (en) | 2021-03-31 | 2021-08-13 | 华为技术有限公司 | Optical storage system and ground insulation impedance detection method |
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