A Three-Phase Current Source Inverter With Third Harmonic Injection For Grid-Connected Renewable Power Sources

Žarko S. Janda; Predrag Ninković; Predrag Pejović

doi:10.5937/zeint34-55462

Žarko S. Janda University of Belgrade, The Nikola Tesla Institue of electrical Engineering https://orcid.org/0000-0002-5696-0399
Predrag Ninković University of Belgrade, The Nikola Tesla Institue of electrical Engineering https://orcid.org/0000-0002-5385-8938
Predrag Pejović Faculty of Electrical Engineering. University of Belgrade https://orcid.org/0000-0003-4064-6204

DOI: https://doi.org/10.5937/zeint34-55462

Keywords: Renewable power sources, distributed power generation, voltage-synchronized current source six-pulse inverter, third-harmonic current injection, optimized third-harmonic injection

Abstract

Abstract: A novel three-phase voltage-synchronized current source (VSCS) converter with third harmonic injection is proposed in this paper. Compared with the conventional vector current control (VCC), phase-locked loop (PLL) is completely removed in this method. This new type of current-source inverters is suitable for application in grid-connected renewable power sources. It is based on a three-phase six-pulse inverter topology with unidirectional switches using line-synchronous control to achieve unity displacement factor at the point of common connection. An additional power circuit to implement the third-harmonic current injection technique is used in order to improve the line current total harmonic distortion. The proposed approach ensures stable operation under weak grid condition. Experimental results on a 1.5 kW prototype with the optimal third harmonic current injection are shown. The theoretical predictions of total harmonic distortion and power factor improvement are confirmed experimentally.

Author Biography

Žarko S. Janda, University of Belgrade, The Nikola Tesla Institue of electrical Engineering

Centar za automatiku i regulaciju

Savetnik za energetsku elektroniku, preklopnu automatiku i regulaciju napona i reaktivnih snaga

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