Anti-Windup Strategy of Repetitive Controller for Three-Phase Four-Leg Grid-Tied Inverter
Tan Cuilan1,2, Xing Yanyi1, Chen Qihong1, Zhang Liyan1
1. School of Automation Wuhan University of Technology Wuhan 430070 China; 2. School of Physics and Information Engineering Jianghan University Wuhan 430056 China
Abstract：Repetitive controller based on internal model principle is widely used in the new energy grid-connected converters. However, due to the limitations of power switch and DC voltage, the repetitive controller is prone to windup which affects the quality of power supply seriously. In order to improve the current quality of the three-phase four-leg grid-tied inverter injected to the grid, the anti-windup strategy is researched based on the MRAW(model recovery anti-windup) theory. Firstly, integral controller based on repetitive control is designed. Secondly, anti-windup compensator of repetitive control is designed based on the plant model to compensate the control and output feedback respectively. The saturation deviation of the control variable is introduced to compensate for the control variable, and the coefficient of the deviation is optimized by the linear quadratic optimal control method. Finally, simulation and experimental results validate that the proposed method of the anti-windup compensator can improve the system performance on dynamic and steady state saturation.
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2019, Vol. 34 
