Energy storage-based power buffering control for photovoltaic power generation system

The maximum power of photovoltaic power generation system varies with the changes of the external environment and is unable to meet the power requirements of loads. In order to solve this problem, this paper established the structure of photovoltaic power generation system based on energy storage, introduced the operation principle of photovoltaic power generation system, analyzed the relationship between the power and the DC bus voltage, and designed passive energy storage system and active energy storage system to buffer the power for satisfying control target. The simulation results show that the active energy storage system has better regulation of power than the passive energy storage system. Through the bi-directional DC-DC converter automatically switching control for storing energy, the power of photovoltaic power generation system is well matching with the power of loads, and DC voltage is also stability.