Automatic-Optimization ADRC-Based Disturbance Rejection Method for Low Voltage Interface Converter in Microgrid

The hybrid energy storage microgrid is regarded as one of the best ways to accommodate distributed energy. Whereas, the power quality of the load-side low-voltage interface will be affected under complex working conditions. Accordingly, an active disturbance rejection control with parameter optimization (ADRCPO) is proposed to deal with these problems. In this paper, the linear extended state observer (LESO) of ADRCPO is reconstructed according to the model information contained in the state equation, so as to improve dynamic response of state reconstruction. In addition, the disturbance immunity of ADRCPO is analyzed, theoretically. Based on the analysis results, the fuzzy logic rules of parameter optimization are given. Finally, the dynamic curves of different strategies under various conditions were obtained by experimental tests on a 40kW experimental platform. Experimental results verify the feasibility and effectiveness of the proposed ADRCPO method.