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This paper presents a DC voltage control analysis for hybrid active power filters (HAPF) under current-mode control scheme. Based on the analysis, it is clearly shown that adding the instantaneous DC voltage control signal as a reactive control parameter is more effective than adding the signal as an active control parameter for the DC voltage control. A(More)
A 3-dimensional (3D) generalized direct PWM algorithm for multilevel converters in a three-phase four-wire active power filter is proposed. It is proved to be equivalent to the newly proposed generalized 3D space vector modulation (SVM). However, the direct PWM greatly simplifies the control algorithm and is much easier to implement in digital processors.(More)
The capacitive-coupling grid-connected inverter (CGCI) is coupled to the point of common coupling via a second-order LC branch. Its operational voltage is much lower than that of a conventional inductive-coupling grid-connected inverter (IGCI) when it serves as a multifunctional inverter to compensate reactive power and transfer active power simultaneously.(More)
In this paper, the system implementation of a hybrid active power filter (HAPF) in three-phase four-wire power system is proposed and discussed. The HAPF is characterized by lower the dc-link rating of the conventional active power filter (APF) without significantly deteriorates the system compensation features and performances. An 110V/1.65KVA HAPF(More)
Based on the modeling of a transformerless, H-bridge, double control loops dynamic voltage restorer (DVR), its stability, harmonics compensation capability, load adaptability and response time are both investigated and analyzed in per-unit system, which demonstrate and predict a stable and good compensating feature. Using the per-unit system to design,(More)
In order to utilize the energy from the renewable energy sources, power conversion system is necessary, in which the voltage source inverter (VSI) is usually the last stage for injecting power to the grid. It is an economical solution to add the function of power quality conditioning to the grid-connected VSI in the low-voltage distribution system. Two(More)