METHOD FOR STARTUP CONTROL OF PHOTOVOLTAIC INVERTER, SYSTEM THEREOF, AND PHOTOVOLTAIC POWER GENERATION SYSTEM

摘要

A method for start control of photovoltaic inverter, a system thereof, and a photovoltaic power generation system are provided. A fan of the photovoltaic inverter is controlled to operate in a case that input voltage of the photovoltaic inverter is greater than a start threshold, and the fan operation is used as a load. Input voltage drop before and after the fan operates is obtained, and in a case that the input voltage drop is less than or equal to a voltage determination threshold, the photovoltaic inverter is controlled to start a grid connection. Using the fan of the photovoltaic inverter as the load in the solution, no external connective dummy load of direct current or alternating current is needed, and cost of additional hardware is reduced; in addition, the voltage determination threshold is amended based on a power determination threshold of the photovoltaic inverter, the voltage determination threshold is allowed to be a dynamic threshold, which varies with an actual situation, and the problem of service life reduction caused by frequent startup of the photovoltaic inverter in case of appropriate voltage and small power is avoided.