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. The voltage determination threshold is changed based on a power determination threshold of the photovoltaic inverter.

主权项

1. A method for startup control of a photovoltaic inverter, comprising:
obtaining a value of an input voltage of the photovoltaic inverter; starting a fan of the photovoltaic inverter in a case that the value of the input voltage of the photovoltaic inverter is greater than a startup threshold, wherein the fan is powered by an input side of the photovoltaic inverter; obtaining a further value of the input voltage of the photovoltaic inverter after the startup of the fan; obtaining a voltage drop of the input voltage based on the value of the input voltage of the photovoltaic inverter and the further value of the input voltage of the photovoltaic inverter after the startup of the fan; and initiating grid-connected operation of the photovoltaic inverter in a case that the voltage drop of the input voltage is less than or equal to a voltage determination threshold, wherein the voltage determination threshold is changed based on a power determination threshold of the photovoltaic inverter.