CN204168221U - A kind of anti-PID device adopting the solar photovoltaic assembly of non-isolated inverter - Google Patents
A kind of anti-PID device adopting the solar photovoltaic assembly of non-isolated inverter Download PDFInfo
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- CN204168221U CN204168221U CN201420614375.2U CN201420614375U CN204168221U CN 204168221 U CN204168221 U CN 204168221U CN 201420614375 U CN201420614375 U CN 201420614375U CN 204168221 U CN204168221 U CN 204168221U
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- power supply
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- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 230000009931 harmful effect Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
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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
The utility model discloses a kind of anti-PID device adopting the solar photovoltaic assembly of non-isolated inverter, it is characterized in that: described anti-PID device comprises DC power supply, earthed switch (6) and diode; Described DC power supply holds (8) and high-voltage output end with being provided with power supply, described power supply ground end (8) ground connection is also electrically connected with the frame (PE) of solar photovoltaic assembly by described earthed switch (6), described high-voltage output end exports+400 ~+1000V high voltage direct current over the ground, this high-voltage output end is electrically connected with the anode of described diode, and the negative electrode of described diode is electrically connected with the voltage output end negative pole (I_A-) of solar photovoltaic assembly.The utility model can offset solar photovoltaic assembly voltage output end negative pole I_A-by day time be in negative pressure and the PID impact that produces.
Description
Technical field
The utility model relates to a kind of anti-PID device, and this anti-PID device can be applicable to the solar photovoltaic assembly that have employed non-isolated inverter.
Background technology
PID effect potential induction attenuation refers to that solar photovoltaic assembly can cause assembly property to be decayed when electrode voltage is negative to large ground voltage, and some three-phase solar power system voltage can up to 1000V, and assembly decay can be even more serious.For avoiding PID potential induction attenuation, battery unit should not be less than zero relative to the electromotive force of surrounding enviroment, if make the minus earth of battery component, the electromotive force of each battery unit of each assembly is all positive, can well avoid PID problem.Adopt the negative pole of the cell panel of isolated inverter system can ground connection, and adopt the negative pole of the solar photovoltaic assembly of non-isolated inverter cannot ground connection, cell piece electrode voltage over the ground frame electromotive force may be negative, then serious PID problem is brought, because negative pole electromotive force is low, more easily there is PID problem in the assembly near negative pole.
Utility model content
Technical problem to be solved in the utility model is: provide a kind of anti-PID device adopting the solar photovoltaic assembly of non-isolated inverter, and the PID that can realize solar photovoltaic assembly repairs and safeguards.
Solve the problems of the technologies described above, the technical scheme that the utility model adopts is as follows:
Adopt an anti-PID device for the solar photovoltaic assembly of non-isolated inverter, it is characterized in that: described anti-PID device comprises DC power supply, earthed switch and diode; Described DC power supply is held and high-voltage output end with being provided with power supply, described power supply ground end ground connection is also electrically connected with the frame of solar photovoltaic assembly by described earthed switch, described high-voltage output end exports+400 ~+1000V high voltage direct current over the ground, this high-voltage output end is electrically connected with the anode of described diode, and the negative electrode of described diode is connected with the voltage output end negative electricity of solar photovoltaic assembly.
For the ease of disconnecting the connection of solar photovoltaic assembly and inverter, improve as one of the present utility model, described anti-PID device also comprises closed type contactor; The voltage output end positive and negative electrode of solar photovoltaic assembly is electrically connected with the input positive and negative electrode of non-isolated inverter by the normally-closed contact of described contactor.
As a kind of execution mode of the present utility model, described DC power supply comprises 24V modular power source and the push-pull circuit for input voltage being converted to described high voltage direct current, the input termination civil power of described 24V modular power source, output are electrically connected with the input of push-pull circuit, the output of push-pull circuit be the power supply of described DC power supply hold and high-voltage output end.
As a kind of execution mode of the present utility model, described anti-PID device also comprises the control circuit for regulating described high voltage direct current magnitude of voltage and the described normally-closed contact break-make of control; Described control circuit is provided with recommends control signal output and contactor control signal output, and this recommends control signal output and contactor control signal output is electrically connected with the control end of described push-pull circuit and the control end of contactor respectively.
As a kind of execution mode of the present utility model, described DC power supply also comprises the circuit of reversed excitation for input voltage being converted to described control circuit operating voltage; The output of described 24V modular power source is electrically connected by the feeder ear of circuit of reversed excitation with described control circuit.
Compared with prior art, the utility model has following beneficial effect:
First, the utility model is provided with DC power supply, earthed switch and diode, under solar photovoltaic assembly is in and does not carry out the state generated electricity evening, by earthed switch of the present utility model is closed, make DC power supply between the voltage output end negative pole and frame of solar photovoltaic assembly, apply the voltage to earth of+400 ~+1000V, thus offset solar photovoltaic assembly voltage output end negative pole by day time be in negative pressure and produce PID impact, and under solar photovoltaic assembly is in and carries out the state generated electricity daytime, by earthed switch of the present utility model is disconnected, the normal work of anti-PID device of the present utility model to solar photovoltaic assembly then can be effectively avoided to impact.
The second, the utility model is provided with closed type contactor, before closed ground switch carries out PID impact counteracting, is first disconnected by the normally-closed contact of contactor, then can effectively avoid the inverter of anti-PID device of the present utility model to photovoltaic plant to cause harmful effect.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
Fig. 1 is the schematic block circuit diagram of anti-PID device of the present utility model.
Embodiment
As shown in Figure 1, anti-PID device of the present utility model can be applicable to the solar photovoltaic assembly 11 that have employed non-isolated inverter 12, and it comprises DC power supply, earthed switch 6 and diode; DC power supply holds 8 and high-voltage output end with being provided with power supply, power supply ground end 8 ground connection are also electrically connected with the frame PE of solar photovoltaic assembly 11 by earthed switch 6, high-voltage output end exports+400 ~+1000V high voltage direct current over the ground, this high-voltage output end is electrically connected with the anode of diode, and the negative electrode of diode is electrically connected with the voltage output end negative pole I_A-of solar photovoltaic assembly 11.
Anti-PID device of the present utility model also comprises closed type contactor 10; Voltage output end positive and negative electrode I_A+, I_A-of solar photovoltaic assembly 11 are electrically connected with input positive and negative electrode O_A+, O_A-of non-isolated inverter 12 by the normally-closed contact of contactor 10.
Anti-PID device of the present utility model also comprises the control circuit 5 for regulating high voltage direct current magnitude of voltage and control normally-closed contact break-make; Control circuit 5 is provided with recommends control signal output and contactor control signal output, and this recommends control signal output and contactor control signal output is electrically connected with the control end of push-pull circuit 2 and the control end of contactor 10 respectively.
Wherein, above-mentioned DC power supply comprises 24V modular power source 1, for input voltage being converted to the push-pull circuit 2 of high voltage direct current and being used for input voltage to convert to the circuit of reversed excitation 3 of control circuit 5 operating voltage.The input termination civil power of 24V modular power source 1, output one tunnel of 24V modular power source 1 is electrically connected with the input of push-pull circuit 2, the output of push-pull circuit 2 be the power supply of DC power supply hold 8 and high-voltage output end; The output of 24V modular power source 1 is separately leaded up to circuit of reversed excitation 3 and is electrically connected with the feeder ear of control circuit 5.
The working method of anti-PID device of the present utility model is as follows:
Under solar photovoltaic assembly 11 is in and does not carry out the state generated electricity evening, by earthed switch 6 of the present utility model is closed, make DC power supply between the voltage output end negative pole I_A-and frame PE of solar photovoltaic assembly 11, apply the voltage to earth of+400 ~+1000V, thus offset solar photovoltaic assembly 11 voltage output end negative pole I_A-by day time be in negative pressure and produce PID impact, and under solar photovoltaic assembly 11 is in and carries out the state generated electricity daytime, by earthed switch 6 of the present utility model is disconnected, the normal work of anti-PID device of the present utility model to solar photovoltaic assembly 11 then can be effectively avoided to impact.
Before closed ground switch 6 carries out PID impact counteracting, first the normally-closed contact of contactor 10 is disconnected, then can effectively avoid the inverter 12 of anti-PID device of the present utility model to photovoltaic plant to cause harmful effect.
By loading the software being adapted to above-mentioned anti-PID device working method in control circuit 5, the automatically working of the anti-PID device of the utility model can be realized.
The utility model does not limit to and above-mentioned embodiment; according to foregoing; according to ordinary technical knowledge and the customary means of this area; do not departing under the utility model above-mentioned basic fundamental thought prerequisite; the utility model can also make the equivalent modifications of other various ways, replacement or change, all drops among protection range of the present utility model.
Claims (5)
1. adopt an anti-PID device for the solar photovoltaic assembly of non-isolated inverter, it is characterized in that: described anti-PID device comprises DC power supply, earthed switch (6) and diode; Described DC power supply holds (8) and high-voltage output end with being provided with power supply, described power supply ground end (8) ground connection is also electrically connected with the frame (PE) of solar photovoltaic assembly (11) by described earthed switch (6), described high-voltage output end exports+400 ~+1000V high voltage direct current over the ground, this high-voltage output end is electrically connected with the anode of described diode, and the negative electrode of described diode is electrically connected with the voltage output end negative pole (I_A-) of solar photovoltaic assembly (11).
2. anti-PID device according to claim 1, is characterized in that: described anti-PID device also comprises closed type contactor (10); The voltage output end positive and negative electrode (I_A+, I_A-) of solar photovoltaic assembly (11) is electrically connected with the input positive and negative electrode (O_A+, O_A-) of non-isolated inverter (12) by the normally-closed contact of described contactor (10).
3. anti-PID device according to claim 2, it is characterized in that: described DC power supply comprises 24V modular power source (1) and the push-pull circuit (2) for input voltage being converted to described high voltage direct current, input termination civil power, the output of described 24V modular power source (1) are electrically connected with the input of push-pull circuit (2), the output of push-pull circuit (2) be the power supply of described DC power supply hold (8) and high-voltage output end.
4. anti-PID device according to claim 3, is characterized in that: described anti-PID device also comprises the control circuit (5) for regulating described high voltage direct current magnitude of voltage and the described normally-closed contact break-make of control; Described control circuit (5) is provided with recommends control signal output and contactor control signal output, and this recommends control signal output and contactor control signal output is electrically connected with the control end of described push-pull circuit (2) and the control end of contactor (10) respectively.
5. anti-PID device according to claim 4, is characterized in that: described DC power supply also comprises the circuit of reversed excitation (3) for input voltage being converted to described control circuit (5) operating voltage; The output of described 24V modular power source (1) is electrically connected with the feeder ear of described control circuit (5) by circuit of reversed excitation (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420614375.2U CN204168221U (en) | 2014-10-22 | 2014-10-22 | A kind of anti-PID device adopting the solar photovoltaic assembly of non-isolated inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420614375.2U CN204168221U (en) | 2014-10-22 | 2014-10-22 | A kind of anti-PID device adopting the solar photovoltaic assembly of non-isolated inverter |
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| Publication Number | Publication Date |
|---|---|
| CN204168221U true CN204168221U (en) | 2015-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420614375.2U Expired - Lifetime CN204168221U (en) | 2014-10-22 | 2014-10-22 | A kind of anti-PID device adopting the solar photovoltaic assembly of non-isolated inverter |
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| CN (1) | CN204168221U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915172A (en) * | 2016-05-11 | 2016-08-31 | 阳光电源股份有限公司 | Device and method of inhibiting potential induced degeneration |
| CN107317486A (en) * | 2017-07-21 | 2017-11-03 | 深圳市赛格瑞电子有限公司 | A kind of ac buck circuit |
-
2014
- 2014-10-22 CN CN201420614375.2U patent/CN204168221U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915172A (en) * | 2016-05-11 | 2016-08-31 | 阳光电源股份有限公司 | Device and method of inhibiting potential induced degeneration |
| CN105915172B (en) * | 2016-05-11 | 2017-12-22 | 阳光电源股份有限公司 | A kind of apparatus and system for suppressing potential induction attenuation |
| US11101661B2 (en) | 2016-05-11 | 2021-08-24 | Sungrow Power Supply Co., Ltd. | Device for suppressing potential induced degradation and system |
| US11973349B2 (en) | 2016-05-11 | 2024-04-30 | Sungrow Power Supply Co., Ltd. | Device for suppressing potential induced degradation and system |
| CN107317486A (en) * | 2017-07-21 | 2017-11-03 | 深圳市赛格瑞电子有限公司 | A kind of ac buck circuit |
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