Research on Protection Circuit Breaker for Photovoltaic Grid Connection with Collaborative Measurement and Control Design of Photovoltaic Inverter

A circuit breaker shall be installed at the AC outlet side of the photovoltaic inverter, i.e. the photovoltaic parallel point, as a protection switch, which can monitor and protect the distribution network and the photovoltaic power generation system. Since the equipment connected to the power distribution master station must pass the authenticated encryption chip to encrypt the communication message, the existing data up and down transmission channel of the photovoltaic power generation system through the mobile communication network is difficult to combine with the encryption method of the distribution station area, and it often lacks information interaction and cooperative scheduling with the distribution station area. PDZ879/02 photovoltaic grid connection protection circuit breaker is designed. It integrates photovoltaic protection function, HPLC-LoRa wireless dual-mode communication, power quality monitoring, photovoltaic inverter collaborative measurement and control and other power Internet of things functions. The photovoltaic circuit breaker has a dual MCU design of master-slave architecture. It uses an external RS485 serial port to connect the photovoltaic inverter, and can collect and upload the operation status of the inverter. It adjusts the power generation state of the photovoltaic inverter locally according to the parameters sent by the main station or the station area fusion terminal. The experimental test shows that the photovoltaic circuit breaker can realize various protection functions, and can send the data to the substation fusion terminal and the distribution automation cloud master station, and operate in coordination with the photovoltaic inverter according to the control strategy.