Integrated higher-order pulse-width modulation filter-transformer structure for single-phase static compensator

Venkatramanan, D and John, Vinod (2013) Integrated higher-order pulse-width modulation filter-transformer structure for single-phase static compensator. In: IET POWER ELECTRONICS, 6 (1). pp. 67-77.

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Abstract

A power filter is necessary to connect the output of a power converter to the grid so as to reduce the harmonic distortion introduced in the line current and voltage by the power converter. Many a times, a transformer is also present before the point of common coupling. Magnetic components often constitute a significant part of the overall weight, size and cost of the grid interface scheme. So, a compact inexpensive design is desirable. A higher-order LCL-filter and a transformer are increasingly being considered for grid interconnection of the power converter. This study proposes a design method based on a three-winding transformer, that generates an integrated structure that behaves as an LCL-filter, with both the filter inductances and the transformer that are merged into a single electromagnetic component. The parameters of the transformer are derived analytically. It is shown that along with a filter capacitor, the transformer parameters provide the filtering action of an LCL-filter. A single-phase full-bridge power converter is operated as a static compensator for performance evaluation of the integrated filter transformer. A resonant integrator-based single-phase phase locked loop and stationary frame AC current controller are employed for grid frequency synchronisation and line current control, respectively.

Item Type:	Journal Article
Publication:	IET POWER ELECTRONICS
Publisher:	INST ENGINEERING TECHNOLOGY-IET
Additional Information:	Copyright of this article is belongs to INST ENGINEERING TECHNOLOGY-IET
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	10 Sep 2013 05:44
Last Modified:	10 Sep 2013 05:44
URI:	http://eprints.iisc.ac.in/id/eprint/47089

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