Distributed photovoltaic power plants have low investment threshold, fast construction, small footprint and flexible installation, which are the main directions of future photovoltaic development. Distributed power generation refers to the power supply system located near the user’s location. In addition to the user’s own use and nearby use, the power produced by it can also send excess power to the local distribution network. Due to the characteristics of dispersion and low energy density of solar energy resources, it has the natural advantages of distributed power generation. Due to the low threshold for centralized investment, the willingness of high electricity price users in parks, large industries, industrial and commercial sectors to utilize distributed power generation is increasing, which directly promotes the gradual increase in the market share of string inverters.