Accurate power sharing and harmonic mitigation scheme for parallel operation of single‑phase voltage source inverters

Minh-Duc Pham; Hong-Hee Lee

Accurate power sharing and harmonic mitigation scheme for parallel operation of single‑phase voltage source inverters

Minh-Duc Pham

Hong-Hee Lee

Vol. 21, No. 1, pp. 164-172, Jan. 2021

10.1007/s43236-020-00159-8

Harmonic mitigation

Stand-alone operation

Renewable energy system

Voltage source inverter

Abstract

Inaccurate reactive power sharing and voltage distortion at the point of common coupling (PCC) always exist in a parallel inverter system due to feeder impedance mismatches and nonlinear load disturbances. An enhanced inverter control scheme through an output impedance adjustment is proposed to address these issues. Inverter output impedance is regulated considering fundamental and harmonic frequencies, and accurate power sharing and improved PCC voltage quality are realized at the steady state. In addition, the compensation scheme is easily applied in multiple parallel inverters without any prior knowledge of the feeder impedance. Experimental results with three parallel inverters validate the feasibility of the proposed control scheme.

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Cite this article

[IEEE Style]

M. Pham and H. Lee, "Accurate power sharing and harmonic mitigation scheme for parallel operation of single‑phase voltage source inverters," Journal of Power Electronics, vol. 21, no. 1, pp. 164-172, 2021. DOI: 10.1007/s43236-020-00159-8.

[ACM Style]

Minh-Duc Pham and Hong-Hee Lee. 2021. Accurate power sharing and harmonic mitigation scheme for parallel operation of single‑phase voltage source inverters. Journal of Power Electronics, 21, 1, (2021), 164-172. DOI: 10.1007/s43236-020-00159-8.