One-Cycle Control Strategy for Dual-Converter Three-Phase PWM Rectifier under Unbalanced Grid Voltage Conditions

You Xu; Qingjie Zhang; Kai Deng

One-Cycle Control Strategy for Dual-Converter Three-Phase PWM Rectifier under Unbalanced Grid Voltage Conditions

You Xu

Qingjie Zhang

Kai Deng

Vol. 15, No. 1, pp. 268-277, Jan. 2015

10.6113/JPE.2015.15.1.268

Invariant power control

Negative-sequence converter

One-cycle control

Positive-sequence converter

Voltage sag

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Abstract

In this paper, a dual-converter three-phase pulse width modulation (PWM) rectifier based on unbalanced one-cycle control(OCC) strategy is proposed. The proposed rectifier is used to eliminate the second harmonic waves of DC voltage and distortionof line currents under unbalanced input grid voltage conditions. The dual-converter PWM rectifier employs two converters,which are called positive-sequence converter and negative-sequence converter. The unbalanced OCC system compensatesfeedback currents of positive-sequence converter via grid negative-sequence voltages, as well as compensates feedback currentsof negative-sequence converter via grid positive-sequence voltages. The AC currents of positive- and negative-sequenceconverter are controlled to be symmetrical. Thus, the workload of every switching device of converter is balanced. Only oneconventional PI controller is adopted to achieve invariant power control. Then, the parameter tuning is simplified, and theextraction for positive- and negative-sequence currents is not needed anymore. The effectiveness and the viability of the controlstrategy are demonstrated through detailed experimental verification.

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Cite this article

[IEEE Style]

Y. Xu, Q. Zhang, K. Deng, "One-Cycle Control Strategy for Dual-Converter Three-Phase PWM Rectifier under Unbalanced Grid Voltage Conditions," Journal of Power Electronics, vol. 15, no. 1, pp. 268-277, 2015. DOI: 10.6113/JPE.2015.15.1.268.

[ACM Style]

You Xu, Qingjie Zhang, and Kai Deng. 2015. One-Cycle Control Strategy for Dual-Converter Three-Phase PWM Rectifier under Unbalanced Grid Voltage Conditions. Journal of Power Electronics, 15, 1, (2015), 268-277. DOI: 10.6113/JPE.2015.15.1.268.