Research on Black Start of High-Proportion Renewable Energy System Based on Solar-Storage Generation System

The use of photovoltaic generation as black-start power supply is of great significance for the black-start in areas with more photovoltaic and less water. However, photovoltaic generation’s ability of black start is limited due to the extreme weather and unstable generation. For the high-proportion renewable energy system based on the solar-storage operation, this paper proposes a black-start method using grid-forming energy storage as the black-start power supply. The grid-forming energy storage can establish the reliable bus voltage for the photovoltaic generation access. Then the solar-storage system can realize the smooth start of the auxiliary equipment for the traditional power plant to restore the supply of significant loads. This process has been verified in a simulation system established in MATLAB/Simulink. During the whole restart process of the auxiliary equipment, frequency varies within 0.2Hz and can be restored to a stable state. It shows that the grid-forming energy storage is a suitable black-start supply for the high-proportion renewable energy system, capable of starting non-self-starting units in the system and providing reliable power for loads.