Voltage Distortion Suppression for Off-grid Inverters with an Improved Load Current Feedforward Control

Yiwen Geng; Xue Zhang; Xiaoqiang Li; Kai Wang; Xibo Yuan

Voltage Distortion Suppression for Off-grid Inverters with an Improved Load Current Feedforward Control

Vol. 17, No. 3, pp. 716-724, May 2017

10.6113/JPE.2019.17.3.716

Load current feedforward

Output impedance

Positive and negative sequence harmonic regulator (PNSHR)

Voltage harmonics

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Abstract

The output voltage of an off-grid inverter is influenced by load current, and the voltage harmonics especially the 5th and 7th are increased with nonlinear loads. In this paper, to attenuate the output voltage harmonics of off-grid inverters with nonlinear loads nearby, a load current feedforward is proposed. It is introduced to a voltage control loop based on the Positive and Negative Sequence Harmonic Regulator (PNSHR) compensation to modify the output impedance at selective frequencies. The parameters of the PNSHR are revised with the output impedance of the off-grid inverter, which minimizes the output impedance of the off-grid inverter. Experimental results verify the proposed method, showing that the output voltage harmonics caused by nonlinear loads can be effectively suppressed.

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Cite this article

[IEEE Style]

Y. Geng, X. Zhang, X. Li, K. Wang, X. Yuan, "Voltage Distortion Suppression for Off-grid Inverters with an Improved Load Current Feedforward Control," Journal of Power Electronics, vol. 17, no. 3, pp. 716-724, 2017. DOI: 10.6113/JPE.2019.17.3.716.

[ACM Style]

Yiwen Geng, Xue Zhang, Xiaoqiang Li, Kai Wang, and Xibo Yuan. 2017. Voltage Distortion Suppression for Off-grid Inverters with an Improved Load Current Feedforward Control. Journal of Power Electronics, 17, 3, (2017), 716-724. DOI: 10.6113/JPE.2019.17.3.716.