Decoupling control and zero dynamics stabilization for shunt hybrid active power filter
来源期刊：中南大学学报(英文版)2014年第5期
论文作者：LU Wei(鲁伟) LI Chun-wen(李春文)
文章页码：1946 - 1955
Key words：harmonics; hybrid active power filter; inverse system method; optimal control; zero dynamics
Abstract: An inverse system method based optimal control strategy was proposed for the shunt hybrid active power filter (SHAPF) to enhance its harmonic elimination performance. Based on the inverse system method, the d-axis and q-axis current dynamics of the SHAPF system were decoupled and linearized into two pseudolinear subsystems. Then, an optimal feedback controller was designed for the pseudolinear system, and the stability condition of the resulting zero dynamics was presented. Under the control strategy, the current dynamics can asymptotically converge to their reference states and the zero dynamics can be bounded. Simulation results show that the proposed control strategy is robust against load variations and system parameter mismatches, its steady-state performance is better than that of the traditional linear control strategy.
LU Wei(鲁伟), LI Chun-wen(李春文)
(Department of Automation, Tsinghua University, Beijing 100084, China)
Abstract:An inverse system method based optimal control strategy was proposed for the shunt hybrid active power filter (SHAPF) to enhance its harmonic elimination performance. Based on the inverse system method, the d-axis and q-axis current dynamics of the SHAPF system were decoupled and linearized into two pseudolinear subsystems. Then, an optimal feedback controller was designed for the pseudolinear system, and the stability condition of the resulting zero dynamics was presented. Under the control strategy, the current dynamics can asymptotically converge to their reference states and the zero dynamics can be bounded. Simulation results show that the proposed control strategy is robust against load variations and system parameter mismatches, its steady-state performance is better than that of the traditional linear control strategy.
Key words:harmonics; hybrid active power filter; inverse system method; optimal control; zero dynamics
