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| LCL Active Power Filter Based on Hybird States Feedback Virtual Damping Control Strategy |
| Xu Fang, Wang Jianfeng, Pan Guobing, Ouyang Jing, Zheng Zhichao |
| Institute of Distributed Energy and Microgrid Zhejiang University of Technology Hangzhou 310023 China |
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Abstract The harmonics generated by the active power filter carrier modulation are filtered by the L filter or the LCL filter. LCL filter is the third-order system, its high frequency harmonics suppression performance is better than the L filter, but the LCL filter will produce resonance peak. A virtual damping control strategy based on hybird states feedback is proposed to realize the virtual damping control and restrain the resonance peak without increasing the current sensor. On the basis of the realization of the virtual damping control strategy, this paper adopts the second-order generalized integrator with phase advance compensation to realize the current control of non-linear load harmonic without static error. The point of common coupling (PCC) current feedback control strategy makes the SAPF fundamental and harmonics current control independently, which improves the system's response and control accuracy. Finally, the method is proved to be valid by the experiment results.
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Received: 30 August 2018
Published: 11 December 2019
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2019, Vol. 34 
