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Research on the Inter-harmonics Equivalent Impedance of Series Hybrid Active Power Filter
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 Title & Authors
Research on the Inter-harmonics Equivalent Impedance of Series Hybrid Active Power Filter
Jian-gong, Zhang; Jian-ben, Liu; Shao-jun, Dai; Qiao-fu, Chen; Jun-jia, He;
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In the series hybrid active power filter (SHAPF) with magnetic flux compensation (MFC), the system current oscillate in the experimental results when adding the same phase harmonic current command in current control block. This condition endangers the security of the SHAPF. Taking the digit period average arithmetic as example, this paper explains the inter-harmonics current oscillation in the experiment. The conclusion is that the SHAPF is unstable to the inter-harmonics current in theory. Limited by the capacity of the inverter, the system current and the inverter output current do not increase to infinite. At last, some methods are proposed to solve this problem. From the practical viewpoint, the voltage feed-forward control is easy to achieve. It can suppress the current oscillation problems, and also improve the filtering effect. The feasibility of the methods is validated by both the emulation and experiment results.
Active power filter;Series transformer;Inter-harmonics oscillation;Voltage feed-forward control;
 Cited by
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