I. Introduction
Solar energy is an inexhaustible renewable energy source for human beings. Photovoltaic power generation can be divided into off-grid type and grid-connected type according to the power supply mode. In grid-connected photovoltaic power generation, compared with centralized power gener-ation, distributed photovoltaic power generation has some significant advantages. Terminal power supply can meet the power demand of various geographical locations, reduce the loss of power supply lines, and greatly improve economic benefits. In addition, for ordinary users, excess electricity can be sent to the power grid, bringing certain economic benefits to themselves [1]–[3].