PID (Potential Induced Degradation)-resistant circuit and monitoring device thereof

A circuit and grounding circuit technology, which is applied to emergency protection circuit devices, electrical components, and protection that reacts to fault currents, to achieve the effects of reducing the number of replacements, preventing safety accidents, and reducing operating costs

Inactive Publication Date: 2013-08-14
CECEP DONGTAI SOLAR ENERGY POWER GENERATION
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the greater the negative bias voltage of the battery board to the ground, the more serious the PID phenomenon.

Method used

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  • PID (Potential Induced Degradation)-resistant circuit and monitoring device thereof

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] Such as figure 1 As shown, an anti-PID circuit includes a photovoltaic cell VC, an inverter DA, and a grounding circuit. The positive pole of the photovoltaic cell VC is connected to the positive pole of the DC input of the inverter DA through the positive pole relay SW1. Photovoltaic cell VC is the solar panel array. The negative pole of the photovoltaic cell VC is connected to the negative pole of the DC input of the inverter DA via the negative pole relay SW2. The inverter DA is used to convert the direct current into alternating current and then send the alternating current to the public power supply line VSS. The grounding circuit is connected between the negative pole of the DC input of the inverter DA and the negative pole relay SW2. The ground circuit includes a fuse protection circuit and a current sensor PA. The fuse protection circuit i...

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Abstract

The invention discloses a PID (Potential Induced Degradation)-resistant circuit and a monitoring device thereof. The PID-resistant circuit comprises a photovoltaic cell, an inverter and a ground circuit, wherein the anode of the photovoltaic cell is connected with the anode of the direct-current input of the inverter through an anode relay; the cathode of the photovoltaic cell is connected with the cathode of the direct-current input of the inverter through a cathode relay; the ground circuit comprises a fusing protection circuit and a current sensor; the fusing protection circuit consists of a fuse and a protective resistor which are connected in parallel; and one end of the ground circuit is connected with the cathode of the direct-current input of the inverter, and the other end of the ground circuit passing through the fusing protection circuit and the current sensor is grounded. Due to the adoption of the PID-resistant circuit, the phenomenon of PID existing in a photovoltaic cell panel can be eliminated effectively; and meanwhile, ground leakage protection and detection are performed on an entire photovoltaic cell panel array, so that electric shock accidents are avoided and rapid detection of ground short-circuit fault is realized.

Description

technical field [0001] The invention relates to photovoltaic panels and grounding circuits. Background technique [0002] PID is the abbreviation of "Potential induced degradation" in English, that is, potential potential induced degradation, which is a unique image of solar panels. It was first discovered by Sunpower, a well-known photovoltaic manufacturer in the United States, in 2005. After discovering the PID phenomenon, many domestic and foreign companies and scientific research institutions have conducted research to varying degrees in terms of module structure and other aspects, but none of them can effectively solve the PID phenomenon. The power generation of photovoltaic power plants in high-temperature and high-humidity areas is greatly reduced, which seriously hinders the development of photovoltaic power plants in eastern coastal areas. The solution of the present invention starts from the photovoltaic system and effectively controls the PID phenomenon by means o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/00H02H3/16
Inventor 王东李建飞刘辉张龙
Owner CECEP DONGTAI SOLAR ENERGY POWER GENERATION
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