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Journal of Applied Mathematics
Volume 2014, Article ID 835720, 8 pages
Research Article

Active Power Filter DC Bus Voltage Piecewise Reaching Law Variable Structure Control

Department of Electronic and Electrical Engineering, Huaiyin Institute of Technology, Huaian, Jiangsu 223003, China

Received 21 July 2014; Accepted 14 August 2014; Published 2 September 2014

Academic Editor: Zhiguang Feng

Copyright © 2014 Baolian Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The DC bus voltage stability control is one key technology to ensure that Active Power Filter (APF) operates stably. The external disturbances such as power grid and load fluctuation and the system parameters changing may affect the stability of APF DC bus voltage and the normal operation of APF. The mathematical model of DC bus voltage is established according to power balance principle and a DC bus voltage piecewise reaching law variable structure control algorithm is proposed to solve the above problem, and the design method is given. The simulation and experiment results proved that the proposed variable structure control algorithm can eliminate the chattering problem existing in traditional variable structure control effectively, is insensitive to system disturbance, and has good robustness and fast dynamic response speed and stable DC bus voltage with small fluctuation. The above advantages ensure the compensation effect of APF.