METHOD FOR CONTROLLING SHUTDOWN OF PHOTOVOLTAIC INVERTERS, SYSTEM THEREOF, AND PHOTOVOLTAIC POWER GENERATION SYSTEM

摘要

A method for controlling shutdown of photovoltaic inverter, a system thereof, and a photovoltaic power generation system are provided. Input current of the direct current side of the photovoltaic inverter is obtained when the grid-connected relay is closed, the first average input current is determined. If the duration for which the input current of the direct current side is less than or equal to the first average input current reaches a first predetermined duration, the grid-connected relay is disconnected, to stop the grid-connected operation of the photovoltaic inverter. In the solution, by determining whether the duration for which the input current of the direct current side of the photovoltaic inverter is less than or equal to the first average input current reaches the first predetermined duration, it is determined whether to stop the grid-connected operation of the photovoltaic inverter. Thus, the duration of the grid-connected operation of the photovoltaic inverter reach a certain range, repeatedly disconnecting and closing the relay are avoided. The problem of the reduction of service life of the relay caused by repeatedly disconnecting and closing the relay in conventional technology is solved.