Method for controlling operation of MLPE device, method for controlling MLPE devices, and photovoltaic system
AssigneeSungrow Power Supply Co., Ltd.
InventorsYanfei Yu, Anying Jiang, Yu Yang, Xiaoxun Li
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Abstract
Provided are a method for controlling operation of a module level power electronics (MLPE) device, a method for controlling MLPE devices and a photovoltaic system. In the method for controlling operation of a MLPE device, if it is determined that a current of a photovoltaic string where the MLPE device is located is less than a current threshold and coding information sent by a converter in the photovoltaic system is not received for a first preset time period, an output voltage or an output power of the MLPE device is controlled to be less than a corresponding threshold.
Claims7
A method for controlling operation of a module level power electronics (MLPE) device, the method applied to the MLPE device, the MLPE device comprising a switching device connected in series with a photovoltaic module corresponding to the MLPE device, and the method comprising:
- detecting a current of a photovoltaic string where the MLPE device is located;
- determining whether the current of the photovoltaic string is less than a current threshold and coding information generated by a chopper switching device in a converter in a photovoltaic system and sent by the converter is not received for a first preset time period;
- and
- controlling, in response to determining that the current of the photovoltaic string is less than the current threshold and the coding information sent by the converter is not received for the first preset time period, an output voltage or an output power of the MLPE device to be less than a corresponding threshold, to reduce voltage stress of the chopper switching device in the converter while maintaining power supply in the converter.
Dependencies are inferred from the claim text.