HEOA optimization droop control of isolated island microgrid based on feedback correction and STA double closed loop

Aiming at the problems of voltage frequency stability, power distribution and dynamic response of microgrid in island mode, a droop control strategy based on feedback correction and super twisting algorithm double closed loop is proposed in this paper. Firstly, the feedforward compensation of voltage and frequency deviation is introduced into the traditional droop control strategy, which significantly enhances the self-recovery ability and stability of the system, and enables the microgrid to respond to load changes and disturbances faster in the island mode. Then, for the voltage and current double closed loop control system, a robust controller based on STA is designed, which can effectively solve the overshoot problem of conventional double closed loop control in dynamic response, and improve the response speed and steady-state accuracy of the system. In addition, this paper also uses Human Evolutionary Optimization Algorithm to optimize the control parameters. The simulation results show that the proposed method is effective in improving the dynamic response speed, stability and robustness of the microgrid, and provides important technical support for the efficient and stable operation of the microgrid in the island mode.