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This paper proposes an adaptive low dc-link voltage controlled LC coupling hybrid active power filter (LC-HAPF) with a neutral inductor, which can compensate both dynamic reactive power and current harmonics in the three-phase four-wire distribution power systems. Due to its adaptive low dc-link voltage characteristic, it can obtain the least switching loss and switching noise and the best compensating performances, compared with the conventional fixed and newly adaptive dc voltage controlled LC-HAPFs. The design procedures of the dc-link voltage controller are discussed, so that the proportional and integral (PI) gains can be designed accordingly. And the general design procedures for the adaptive dc voltage controlled LC-HAPF with neutral inductor are also given. The validity and effectiveness of the adaptive dc-link voltage controlled LC-HAPF with neutral inductor are confirmed by experimental results obtained from a 220V, 10kVA laboratory prototype compared with the conventional fixed and adaptive dc-link voltage controlled LC-HAPFs without neutral inductor.Index Terms-Active power filters, current harmonics, dc-link voltage control, hybrid active power filters, passive power filters, reactive power. 1

This paper investigates different dc-link voltage control strategies in a three-phase four-wire LC coupling hybrid active power filter (LC-HAPF) for reactive power compensation. By using direct current (current reference) PWM control method, to achieve dc-link voltage self-charging function during LC-HAPF start-up process, the dc-link voltage control signal feedback as reactive current component is more effective than the traditional method as active current component. However, when the LC-HAPF is performing dynamic reactive power compensation, this dc-link voltage control scheme will influence the reactive power compensation, thus makes the LC-HAPF lack of success to carry out dynamic reactive power compensation.In this paper, a novel dc-link voltage control scheme for LC-HAPF is proposed, so that the dc-link voltage control with start-up self-charging process can be obtained as well as providing dynamic reactive power compensation. Representative simulation and experimental results of the three-phase four-wire center-spilt LC-HAPF are presented to verify all deductions, and also show the effectiveness of the proposed dc-link voltage control scheme in dynamic reactive power compensation compared with the control scheme as reactive one.Keywords -Active power filters, dc-link voltage control, hybrid active power filters, passive power filters, reactive power control.

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