Active Disturbance Rejection and Voltage Stabilization Control Strategy for Energy Storage Converter in Microgrid Based on Observation State Correction

The output fluctuation of the high proportion of photovoltaic new energy requires introducing energy storage units for compensation and adjustment, but the voltage stability performance of energy storage port converters under complex working conditions is often not effectively guaranteed. Therefore, this paper proposes an active disturbance rejection voltage stabilization strategy considering observation state correction for energy storage port converters. By deriving the high-precision paradigm of observation deviation, the important structural factors of observation deviation in the system are pointed out, and the ignored high-order terms of deviation are compensated into the observer to achieve accurate and rapid convergence of tracking deviation. Furthermore, through the theoretical analysis of the strategy in four dimensions of stability performance, tracking performance, anti-disturbance performance, and robust performance, the reasons why the strategy can effectively improve the anti-disturbance and robustness of the converter are explained. Finally, the simulation and experimental results jointly demonstrate that the strategy performs better anti-disturbance and robust-ness performance than traditional active disturbance rejection control under various complex working conditions of microgrids, which is of great significance for improving the stability of microgrid operation.