Control Method for Reducing the THD of Grid Current of Three-Phase Grid-Connected Inverters Under Distorted Grid Voltages

Thanh-Vu Tran; Tae-Won Chun; Hong-Hee Lee; Heung-Geun Kim; Eui-Cheol Nho

Control Method for Reducing the THD of Grid Current of Three-Phase Grid-Connected Inverters Under Distorted Grid Voltages

Vol. 13, No. 4, pp. 712-718, Jul. 2013

10.6113/JPE.2013.13.4.712

Current control

Grid-connected inverter

Harmonic distortion

Total harmonic distortion (THD)

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Abstract

This paper proposes a control method for reducing the total harmonic distortion (THD) of the grid current of three-phase grid-connected inverter systems when the grid voltage is distorted. The THD of the grid current caused by grid voltage harmonics is derived by considering the phase delay and magnitude attenuation due to the hardware low-pass filter (LPF). The Cauchy-Schwarz inequality theory is used in order to search more easily for the minimum point of the THD. Both the gain and angle of the compensation voltage at the minimum point of the THD of the grid current are derived with the variation of cut-off frequencies of the hardware LPF. Simulation and experimental results show the validity of the proposed control methods.

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Cite this article

[IEEE Style]

T. Tran, T. Chun, H. Lee, H. Kim, E. Nho, "Control Method for Reducing the THD of Grid Current of Three-Phase Grid-Connected Inverters Under Distorted Grid Voltages," Journal of Power Electronics, vol. 13, no. 4, pp. 712-718, 2013. DOI: 10.6113/JPE.2013.13.4.712.

[ACM Style]

Thanh-Vu Tran, Tae-Won Chun, Hong-Hee Lee, Heung-Geun Kim, and Eui-Cheol Nho. 2013. Control Method for Reducing the THD of Grid Current of Three-Phase Grid-Connected Inverters Under Distorted Grid Voltages. Journal of Power Electronics, 13, 4, (2013), 712-718. DOI: 10.6113/JPE.2013.13.4.712.