Improved Linear Autodisturbance Rejection Control for Microgrid Inverter Control
Aiming at the problem of insufficient anti-disturbance effect of traditional PI control strategy based inverter control in traditional microgrid operation,active disturbance rejection control strategy is used to optimize the control of the inner loop part of the control system.Due to the large-scale access of new energy generation systems,the microgrid operates under weak grid condi-tions.In order to improve the disturbance estimation of the control system and the impact of disturbances in the power grid system on the control performance of the microgrid,traditional control strategy is improved,a cascaded ADRC strategy is proposed.In the fre-quency domain,it is found that the better control strategy outperforms traditional ADRC in terms of re-disturbance estimation and disturbance suppression.The simulation experiment results show that the ADRC strategy has a better effect on dealing with voltage drops and high grid impedance in the power grid,and can smoothly transition to current jumps that occur during connected/off grid switching.The proposed strategy has better stability and robustness.
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