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A bipolar pid repair device and photovoltaic system

A bipolar, photovoltaic cell technology, applied in photovoltaic modules, photovoltaic power generation, electrical components, etc., can solve the problem of high forward bias or negative bias voltage of photovoltaic cells, open circuit voltage of photovoltaic cells, decrease of short-circuit current fill factor, Problems such as poor compatibility of photovoltaic systems to achieve the effect of improving compatibility

Active Publication Date: 2021-12-10
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the increase in the voltage of the photovoltaic system will cause the photovoltaic unit to bear a higher forward bias or negative bias to the ground, especially under special conditions such as high temperature and high humidity, the photovoltaic modules included in the photovoltaic unit will appear serious PID ( Potential Induced Degradation (Potential Induced Degradation) effect, resulting in a decrease in the open circuit voltage, short circuit current, and fill factor of the photovoltaic unit, which gradually reduces the power generation of the photovoltaic system
[0004] In order to repair the PID effect, a high-frequency switching power supply is generally used to positively raise the negative electrode PV- of the photovoltaic unit to the ground potential, thereby realizing the restoration of the PID effect of the photovoltaic unit, but this method can only be applied to photovoltaic systems using P-type photovoltaic units , not suitable for photovoltaic systems using N-type photovoltaic units, so the compatibility with photovoltaic systems is poor

Method used

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  • A bipolar pid repair device and photovoltaic system
  • A bipolar pid repair device and photovoltaic system
  • A bipolar pid repair device and photovoltaic system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] An embodiment of the present application provides a bipolar PID repair device, which will be described in detail below with reference to the accompanying drawings.

[0066] see figure 1 , which is a schematic diagram of a bipolar PID repair device provided in the embodiment of the present application.

[0067] Firstly, the working principle of the photovoltaic system will be described below. The photovoltaic system in the figure includes a photovoltaic unit 10 and an inverter 11 .

[0068] In the figure, the input end of the inverter 11 is connected to a photovoltaic unit 10, but in practical applications, multiple photovoltaic units 10 can also be connected to increase the power generation. Multiple photovoltaic units 10 can form a photovoltaic array. The single photovoltaic unit in the embodiment of this application The unit 10 may include one photovoltaic module, and may also be formed by connecting multiple photovoltaic modules in series and in parallel. For exampl...

Embodiment 2

[0098] see image 3 , which is a schematic diagram of another bipolar PID repair device provided in the embodiment of the present application.

[0099] The AC power-taking circuit 101 of the repairing device includes: a first transformer 101a, a first resistor R1 and a start switch S0.

[0100] Wherein, the primary winding of the first transformer 101a is connected to the AC grid, the first resistor R1 is connected in series with the primary winding of the first transformer 101a, and the start switch S0 is connected in parallel with both ends of the first resistor R0. Wherein, the first resistor R1 is used to protect the circuit when the first transformer 101a is excited.

[0101] The secondary winding of the first transformer 101 a is connected to the input end of the bidirectional rectification circuit 102 .

[0102] The controller 103 can control the start switch S0 to close after the excitation of the first transformer 101a ends, and short-circuit R1 to reduce loss.

[...

Embodiment 3

[0121] The embodiment of the present application provides another bipolar PID repair device, which adopts a different implementation method from the AC power supply circuit of the bipolar PID repair device provided in the second embodiment of the device, and will be described in detail below with reference to the accompanying drawings .

[0122] see Image 6 , which is a schematic diagram of another bipolar PID repair device provided in the embodiment of the present application.

[0123] The AC power-taking circuit 101 of the repairing device includes: a rectification transformation unit 101b1, a high-frequency pulse generation circuit 101b2 and a second transformer 101b3.

[0124] Wherein, the rectification conversion unit 101b1 rectifies the alternating current of the alternating current grid into direct current and then sends it to the high frequency pulse generating circuit 101b2.

[0125] Under the control of the controller 103, the high-frequency pulse generating circu...

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Abstract

The application discloses a bipolar PID repair device and a photovoltaic system. The input end of the AC power-taking circuit of the device is connected to the AC power grid, and the output end is connected to the input end of the bidirectional rectification circuit, which is used for taking power from the AC power grid and delivering the taken AC power to the bidirectional rectification circuit. Under the control of the controller, the bidirectional rectification circuit rectifies the alternating current delivered by the alternating current power taking circuit into direct current. The capacitor is connected in parallel between the first end and the second end of the output end of the bidirectional rectification circuit; the first end of the output end of the bidirectional rectification circuit is connected to the negative or positive pole of the photovoltaic unit, and the second end of the output end of the bidirectional rectification circuit is grounded. The controller controls the bidirectional rectifier circuit to output a positive voltage when the photovoltaic unit needs to raise the voltage positively to the ground; when the photovoltaic unit needs to raise the voltage negatively to the ground, controls the bidirectional rectifier circuit to output a negative voltage. The device can switch the boosted voltage to meet the requirements of different types of photovoltaic units, thereby improving the compatibility with photovoltaic systems.

Description

technical field [0001] This application relates to the technical field of power electronics, in particular to a bipolar PID repair device and a photovoltaic system. Background technique [0002] In order to reduce the cost of photovoltaic systems and increase the power generation capacity of photovoltaic systems, the voltage configuration of photovoltaic units in photovoltaic systems is getting higher and higher, and high-voltage photovoltaic systems (such as 1500V high-voltage photovoltaic systems) have gradually become the mainstream of the market. [0003] However, the increase in the voltage of the photovoltaic system will cause the photovoltaic unit to bear a higher forward bias or negative bias to the ground, especially under special conditions such as high temperature and high humidity, the photovoltaic modules included in the photovoltaic unit will appear serious PID ( The Potential Induced Degradation (Potential Induced Degradation) effect leads to a decrease in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02S40/30H02J3/38
CPCH02S40/30Y02E10/50
Inventor 汪昌友邢军薛丽英
Owner SUNGROW POWER SUPPLY CO LTD
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