Active disturbance rejection control based distributed secondary control for a low-voltage DC microgrid

The droop control method is widely used in DC microgrid due to its easy realization. However, the voltage deviation and current sharing accuracy caused by droop control cannot be ignored. In order to overcome the drawbacks of the droop control method, this paper proposes a new distributed secondary control scheme based on linear active disturbance rejection control (LADRC). In the distributed secondary control scheme, the voltage deviation is compensated by the voltage controller based on LADRC, and the current controller based on LADRC eliminates the output impedance deviation between different converters, thereby improving current sharing accuracy. This paper analyzes the performance of the proposed control scheme in the frequency domain. Finally, the effectiveness of the proposed method is verified. Moreover, simulation and experimental results show that the proposed control strategy has good dynamic performance. (C) 2021 Elsevier Ltd. All rights reserved.