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Journal of Electrical and Computer Engineering
Volume 2018, Article ID 5909346, 10 pages
https://doi.org/10.1155/2018/5909346
Research Article

Feedforward Harmonic Mitigation Strategy for Single-Phase Voltage Source Converter

School of Electric Power, South China University of Technology, Guangzhou, China

Correspondence should be addressed to Qing Zhong; nc.ude.tucs@gnohzqpe

Received 9 November 2017; Revised 20 December 2017; Accepted 21 December 2017; Published 28 January 2018

Academic Editor: Alessandro Lidozzi

Copyright © 2018 Qing Zhong et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

With the development of distributed generations (DGs), single-phase voltage source converter (SPVSC) has been widely used, but it brings about the problem of harmonic pollution to power grid. Hence, it is significant to explore the mechanism of harmonic injection from SPVSC and propose effective control strategies to mitigate the harmonic pollution. In this paper, a harmonic analysis model of SPVSC based on dynamic phasor (DP) has been established. With the model, the harmonics interaction between the ac side and the dc side can be analyzed with the consideration of the control strategies, which reveals the generation mechanism of the harmonics in SPVSC. Based on the mechanism, a feedforward harmonic mitigation strategy has been presented. The principle of the strategy is to add low-order harmonic signal to the PWM modulation signals to reduce the harmonic current on the ac side. The harmonic mitigation strategy not only has clear physical meaning and fast calculation, but also is robust for the uncertainty of parameters. Finally, the simulation and experiment results demonstrate the correctness of the model and the effectiveness of the harmonic mitigation strategy.