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Design and control of LCL-filter with active damping for Active Power Filter

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4 Author(s)
Guohong Zeng ; Sch. of Electr. Eng., Beijing Jiaotong Univ., Beijing, China ; Rasmussen, T.W. ; Lin Ma ; Teodorescu, R.

In the application of shunt Active Power Filter (APF) to compensate nonlinear load's harmonic, reactive and negative sequence current, it is more effective to use a LCL-filter than an L-filter as an interface between the Voltage Source Converter (VSC) and grid. In this paper, a designing procedure of LCL-filter for APF is introduced, which is aimed for simplified the implementation. To suppress the resonance that may be excited in the system, which brings in stability problems, an active damping control strategy using the current feed-back of the filter capacitor is adopted. By selecting two equal or similar inductances, the filter designing become more simple and effective, meanwhile the capacitance requirement is minimized. A pole-zero automatic cancellation phenomenon is discussed in this paper, which can be applied to simplify the current regulator designing. The tuning method is presented, based on pole-zero mapping. Some simulation results of APF with LCL-filter are presented to verify the feasibility and stability of the proposed designing method and control strategy.

Published in:

Industrial Electronics (ISIE), 2010 IEEE International Symposium on

Date of Conference:

4-7 July 2010