Photovoltaic system, fault detection method thereof, circuit and photovoltaic equipment

• Main Authors: MENG XIAOQIANG, WANG JING, CUI CHENGHAO, HUANG MENG, FENG SHANGXIAN
• Format: Patent
• Language: Chinese; English
• Published: 25.01.2022
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRA-REDRADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, E.G. USINGPHOTOVOLTAIC [PV] MODULES

The invention relates to a photovoltaic system, a fault detection method thereof, a circuit and photovoltaic equipment. The photovoltaic system is divided into a component level, a group cascade level and a load level. The method comprises the following steps: in the operation process of the photovoltaic system, respectively collecting component level electrical parameters corresponding to the component level, group cascade level electrical parameters corresponding to the group cascade level and load level electrical parameters corresponding to the load level; then analyzing each electrical parameter and a preset parameter threshold, and outputting a component level signal, a group cascade level signal and a load level signal to a signal processing circuit of the photovoltaic system; and finally, combining a first fault detection signal output by the signal processing circuit under the component level signal, a second fault detection signal output by the signal processing circuit under the group cascade level