Bus voltage stability control of the distributed photovoltaic and energy storage DC microgrid based on ADRC

This paper proposes a fast and efficient MPPT photovoltaic control strategy and a BESS bus stabilized power control method for the high-performance operation control requirements of the distributed photovoltaic and energy storage DC microgrid. The distributed photovoltaic and energy storage DC microgrid is composed of solar photovoltaic power generation system, battery energy storage system and DC load. First, the principle of power balance of photovoltaic and energy storage in DC micro-grid is analyzed, and the mathematical model of distributed power generation in DC microgrid is derived. In order to improve the high-efficiency absorption capacity of photovoltaic energy, the MPPT photovoltaic controller of the exponential variable step disturbance observation method based on the variable smoothing factor is designed. Considering the impact of photovoltaic power generation and load power fluctuations on the bus voltage stability, applying the active disturbance rejection control (ADRC) theory, the BESS DC bus voltage stability controller is designed to realize the reasonable distribution of the optical storage power in the network and the dynamic and stable control of the bus voltage. Using MATLAB/Simulink software, a system simulation model is established. Through a variety of simulation condition tests, and comparing with traditional PID control performance, the correctness and effectiveness of the proposed method are verified.