Bus Voltage Stability Study of DC Bus Photovoltaic Systems: A Review

In order to solve the problems of system stability decline and output voltage fluctuation caused by the change of environment of DC bus photovoltaic power generation system, the voltage stability of DC bus is summarized in this paper. The study is carried out in two main areas. On the one hand, the input voltage of the DC bus is guaranteed by summarizing and analyzing the structure and control strategies of different DC/DC converters. On the other hand, the direct control of the DC bus voltage is investigated, which is divided into three categories, namely energy storage device-based voltage control, controller-based voltage control and other types of control. Finally, a summary and outlook are given. It provides an effective reference for subsequent researchers in the study of bus voltage control of DC bus type photovoltaic power generation system.