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| Received:October 28, 2005Revised:March 20, 2006 |
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| Nonlinear disturbance attenuation control for four-leg active power filter based on voltage source inverter |
| Juming CHEN, Feng LIU, Shengwei MEI |
| (State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China; The Institute of System Science, Chinese Academy of Science, Beijing 100080, China) |
| Abstract: |
| Active power filter (APF) based on voltage source inverter VSI is one of the important measures for handling the power quality problem. Mathematically, the APF model in a power grid is a typical nonlinear one. The idea of passivity is a powerful tool to study the stabilization of such a nonlinear system. In this paper, a state-space model of the four-leg APF is derived, based on which a new H-infinity controller for current tracking is proposed from the passivity point of view. It can achieve not only asymptotic tracking, but also disturbance attenuation in the sense of L2-gain. Subsequently, a sufficient condition to guarantee the boundedness and desired mean of the DC voltage is also given. This straightforward condition is consistent with the power-balancing law of electrical circuits. Simulations performed on PSCAD platform verify the validity of the new approach. |
| Key words: APF Nonlinear system Disturbance attenuation Current tracking control |
