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A device and system for suppressing potential-induced decay

A potential-induced attenuation, photovoltaic system technology, applied in circuit devices, output power conversion devices, circuits, etc., can solve problems such as high cost and affect the reliability of photovoltaic systems, and achieve low cost, low power consumption, and small capacity. Effect

Active Publication Date: 2017-12-22
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, a voltage compensation device is added on the DC side of the photovoltaic system. For a photovoltaic system with multiple photovoltaic inverters connected in parallel on the AC side, it is necessary to add a voltage compensation device on the DC side of each photovoltaic inverter, so the cost is high In addition, there may be circulating currents between multiple voltage compensation devices, which will affect the reliability of the photovoltaic system

Method used

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  • A device and system for suppressing potential-induced decay
  • A device and system for suppressing potential-induced decay
  • A device and system for suppressing potential-induced decay

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] See Figure 1a with Figure 1b This figure is a schematic diagram of the first embodiment of the device for suppressing the attenuation induced by electric potential provided by the present invention.

[0058] The device for suppressing the attenuation induced by electric potential provided by this embodiment is connected between the AC output end of the converter in the photovoltaic system and the grid-connected power frequency transformer; the device includes: a rectifier module 100 and a non-isolated level conversion module 200 and at least one capacitor C;

[0059] Such as Figure 1a As shown, the input end of the rectification module 100 is connected to the output end of the converter; the rectification module 100 is used to rectify the alternating current output by the converter into direct current; the non-isolated level conversion The module 200 is used for level conversion of the direct current output by the rectification module; the level conversion is a boost conver...

Embodiment 2

[0067] See Figure 2a with Figure 2b , This figure is a schematic diagram of Embodiment 2 of the device provided by the present invention.

[0068] In this embodiment, when the input terminal of the rectifier module 100 is connected to the output terminal of the converter: the non-isolated level conversion module is specifically any one of the following: Boost circuit, Buck-boost circuit , Cuk circuit, Sepic circuit and Zeta circuit.

[0069] It should be noted that the rectifier module 100 in this embodiment is an uncontrolled rectifier bridge as an example for introduction. Such as Figure 2a As shown, the uncontrolled rectifier bridge is a three-phase full bridge circuit.

[0070] In this embodiment, the non-isolated level conversion module is the Buck-boost circuit 2001 for introduction; the output terminal of the Buck-boost circuit 2001 is connected in parallel with the capacitor C;

[0071] When the positive pole of the capacitor C is grounded, the voltage of the photovoltaic ...

Embodiment 3

[0079] See Figure 4a with Figure 4b , This figure is a schematic diagram of Embodiment 3 of the device provided by the present invention.

[0080] In the device provided in this embodiment, when the input terminal of the rectifier module 100 is connected to the output terminal of the converter: the non-isolated level conversion module is the Boost circuit 2002; the output terminal of the Boost circuit 2002 is connected in parallel The capacitance C;

[0081] Such as Figure 4a As shown, when the negative electrode of the capacitor C is grounded, the output voltage of the non-isolated level conversion module is controlled to make the voltage of the photovoltaic system to the ground positive.

[0082] Such as Figure 4b As shown, when the positive pole of the capacitor C is grounded, the voltage of the photovoltaic system to the ground is negative by controlling the output voltage of the non-isolated level conversion module.

[0083] Combine below Figure 5a Description Figure 4a The...

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Abstract

The invention provides a device and system for suppressing potential-induced attenuation. The device is connected between the AC output end of the converter and the grid-connected power frequency transformer; the device includes: a rectifier module, a non-isolated level conversion module and at least A capacitor; the input terminal of the rectifier module is connected to the output terminal of the converter; the rectifier module rectifies the AC output from the converter to DC; the non-isolated level conversion module performs level conversion on the DC output of the rectifier module; level conversion It is boost conversion or voltage reverse conversion; or, the input terminal of the non-isolated level conversion module is connected to the output terminal of the converter; the non-isolated level conversion module is used to level the alternating current output by the converter Conversion, level conversion to boost conversion; the rectification module rectifies the alternating current output by the non-isolated level conversion module into direct current; the capacitor is connected in parallel to the output terminal of the direct current, and the positive pole or negative pole of the capacitor is grounded. The device can prevent or weaken the PID effect of the photovoltaic panel.

Description

Technical field [0001] The present invention relates to the technical field of photovoltaic power generation, in particular to a device and system for suppressing the attenuation induced by electric potential. Background technique [0002] Potential Induced Degradation (PID, Potential Induced Degradation) refers to the attenuation of the output characteristics of certain types of photovoltaic panels due to potential induction under a specific ground voltage. The PID effect will cause the output power of the photovoltaic system to drop. [0003] Therefore, in order to prevent or reduce the PID effect, it is necessary to compensate the voltage to the ground of the photovoltaic system, so that the bias voltage of the photovoltaic panel to the ground is in an area where the PID effect is not generated. [0004] In the prior art, a voltage compensation device is added to the DC side of the photovoltaic system. For a photovoltaic system with multiple photovoltaic inverters in parallel on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02S40/32
CPCH02S40/32H02J3/381H02J2300/24H02M3/335H02M7/00Y02E10/56H01F38/42H02J3/38H02M3/005H02M3/24H02M7/06H02M7/217
Inventor 俞雁飞倪华杨宗军代尚方
Owner SUNGROW POWER SUPPLY CO LTD
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