Electrical regulation system and method for potential induced degradation of photovoltaic power generation

Abstract

The invention provides an electrical regulation system and method for potential induced degradation of photovoltaic power generation. The system comprises a photovoltaic array, an inverter, a proportion integration differentiation (PID) dynamic suppression circuit and an AC power distribution unit, wherein an output end of the photovoltaic array is connected with a DC input end of the inverter, an output end of the inverter is connected with an input end of the AC power distribution unit, an input end of the PID dynamic suppression circuit is connected with the DC input end of the inverter, an output end of the PID dynamic suppression circuit is connected with a bus midpoint N of the inverter, and the PID dynamic suppression circuit is used for detecting a ground voltage of a PV negative electrode of the DC input end of the inverter in real time and adjusting a voltage of the bus midpoint N of the inverter according to the ground voltage of the PV negative electrode so that the ground voltage of the PV negative electrode is larger than 0. By the system, the potential induced degradation can be intelligently suppressed, a battery panel of which the potential induced degradation occurs can be restored on line, and the benefit of the photovoltaic power generation is improved.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to an electrical regulation system and method for potential-induced attenuation of photovoltaic power generation. Background technique [0002] Solar energy is an inexhaustible renewable energy source for human beings. It has the advantages of cleanliness, safety, extensiveness, durability, sufficiency, easy maintenance and potential economy. It has important strategic status. Solar power is an emerging way of making renewable energy available. After more than ten years of rapid development and construction, the current global photovoltaic installed capacity is between 200GW and 300GW, and the photovoltaic solar power generation industry has become an important part of the energy field. The photovoltaic solar energy industry has been included in my country's strategic emerging industries. China has leapt to the top of the world in newly installed photovoltaic...

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Problems solved by technology

[0004] The invention provides an electrical regulation system and method for potential-induced attenuation of photovoltaic power generation, which solves the problems of the current photovoltaic power generation that produces potential-induced attenuation that causes output power to drop, and cannot intelligently suppress potential-induced attenuation and online repair of battery panels that have potential-induced attenuation Problems can improve the service life of photovoltaic power generation equipment, ensure stable output power of photovoltaic power generation equipment, and effectively increase the income of photovoltaic power generation

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