Photovoltaic inverter system and PID effect compensation method and apparatus thereof

A photovoltaic inverter and compensation device technology, applied in photovoltaic system monitoring, photovoltaic modules, photovoltaic power generation, etc., can solve the problems of photovoltaic module repair, high cost, etc.

Active Publication Date: 2017-03-15
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
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Problems solved by technology

[0005] The invention provides a photovoltaic inverter system and its PID effect compensation device and method to solve

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  • Photovoltaic inverter system and PID effect compensation method and apparatus thereof
  • Photovoltaic inverter system and PID effect compensation method and apparatus thereof
  • Photovoltaic inverter system and PID effect compensation method and apparatus thereof

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Embodiment Construction

[0054] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0055] The invention provides a photovoltaic inverter system and its PID effect compensation device and method to solve the problems in the prior art that the cost is high and the photovoltaic modules that have PID effect cannot be repaired.

[0056] Specifically, the PID effect compensation method of the photovoltaic inverter system is applied to the PID effect compensation device of the photovoltaic inverter system. For the PID effect compensation device of the photovoltaic inverter system, see figure 2 , including: a DC voltage sampling unit 101, a processing control unit 102, an isolated AC / DC conversion unit 103 and a switching protection unit 104; the PID effect compensation method of the photovoltaic inverter system, see image...

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Abstract

The invention provides a photovoltaic inverter system and a potential-induced-degradation (PID) effect compensation method and apparatus thereof. A processing control unit records operation conditions of all photovoltaic assemblies and determines a PID effect compensation condition and thus carries out optimized calculation of a compensation voltage, thereby controlling an integrated PID compensation unit to carry out PID effect compensation on the photovoltaic assemblies and thus realizing PID effect compensation repairing. Therefore, a photovoltaic assembly attenuation problem in the photovoltaic power station can be solved effectively and the generating capacity of the system can be improved. Compared with the prior art, the system, method and apparatus provided by the invention enables the practical operation reliability to be improved and the maintenance cost to be reduced.

Description

technical field [0001] The invention relates to the technical field of PID effect compensation, in particular to a photovoltaic inverter system and a PID effect compensation device and method thereof. Background technique [0002] PID (Potential Induced Degradation, Potential Induced Degradation) effect refers to a kind of output performance degradation that occurs when the output of photovoltaic modules (that is, the string input of the photovoltaic inverter system) is subjected to a high negative bias voltage on the metal frame. The phenomenon is mainly manifested in the decrease of open circuit voltage, short circuit current and fill factor of components. In recent years, with the vigorous development of photovoltaic grid-connected power generation systems, the string input voltage configuration of photovoltaic inverter systems has become higher and higher, and 1500V systems are gradually being promoted and applied. Since the metal frame of the photovoltaic module is gen...

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/381H02J2300/24H02J3/46H02S10/00H02S50/10Y02E10/56G05F1/10H02S40/32
Inventor 汪昌友孙维李必杰
Owner SUNGROW POWER SUPPLY CO LTD
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