Control Strategy of Grid-connected Wind Power Inverter Based on Linear Active Disturbance Rejection Control

Abstract

Aiming at the problem of insufficient anti-disturbance performance and control accuracy of the traditional double closed-loop control strategy in the grid-connected inverter of permanent magnet direct drive wind power system, this paper proposes a control strategy that applies linear active disturbance rejection control technology to the voltage outer loop controller. To improve the control performance of the DC bus voltage. By introducing the sum disturbance signal in the expanded state observer (ESO) to observe its change trend, an effective early correction signal is generated, thereby improving the control system dynamic disturbance observation ability. The analysis of frequency response characteristics and simulation results under various working conditions show that, compared with traditional control methods, this method not only has a faster response speed, but also has a better anti-interference ability.