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This paper presents a harmonic suppression control strategy under unbalanced point of common coupling (PCC) voltage for modular multilevel converter based shunt active power filter (MMC-SAPF). Harmonics are extracted by multiple synchronous reference frame (MSRF) algorithm to generate the compensation current references of positive- and negative-sequence control for MMC-SAPF. The proposed independent...
Three-phase three-wire shunt active power filter (SAPF) with traditional positive-sequence control can only compensate part of the nonlinear load current harmonics if the PCC voltage changes from balanced to unbalanced condition. Changes of both nonlinear load current harmonic components and equivalent circuit for modular multilevel converter based SAPF (MMC-SAPF) are analyzed in the paper. To solve...
Most common problem arising in supply network is current harmonics because of the increased use of nonlinear loads. Traditionally passive and active filters are best solutions for harmonic removal, but they have some practical limitations. Solution to these limitations is to use hybrid active power filters (HAPF) which are different combinations of passive and/or active filters. HAPF inherit the efficiency...
Compared to traditional load current detection type Active Power Filter (APF), source current detection type APF belongs to closed-loop control in control theory, which can improve its filtering performance dramatically. At first, this paper introduces two conventional APF control schemes with source current detection-proportional control and non-harmonic detection control. By analyzing, we points...
Fuel cell systems appear as a good alternative for future power generation. This is mainly due to their high energy conversion efficiency and simple operation. Since the output of the fuel cell is low voltage DC, fuel cell systems supplying power to AC loads are usually constructed using a two stage approach cascading a DC-DC converter and an inverter. It can be shown that in such a system the current...
This paper deals with a novel configuration of single-phase hybrid active power filter. One of the advantages of the proposed hybrid filter is its adjustable capability to determine voltage rating and current rating of active power stage by selecting appropriate values for its passive filter parameters. Equivalent circuit of proposed hybrid filter has been presented and its filtering characteristic...
Active power filter (APF) is one of the most effective solutions to compensate the current harmonics and to enhance the power quality in industrial application. Control is one of the key elements to their performance. This paper proposes a generalized control approach for APF, which provides a systematical way not only to analysis the regular control schemes but also develop new control schemes. Based...
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