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

다국어 초록 (Multilingual 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 distortion of 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 compensates feedback currents of positive-sequence converter via grid negative-sequence voltages, as well as compensates feedback currents of negative-sequence converter via grid positive-sequence voltages. The AC currents of positive- and negative-sequence converter are controlled to be symmetrical. Thus, the workload of every switching device of converter is balanced. Only one conventional PI controller is adopted to achieve invariant power control. Then, the parameter tuning is simplified, and the extraction for positive- and negative-sequence currents is not needed anymore. The effectiveness and the viability of the control strategy are demonstrated through detailed experimental verification.

목차 (Table of Contents)

• Abstract
• Ⅰ. INTRODUCTION
• Ⅱ. OCC FOR DUAL-CONVERTER THREE-PHASE PWM RECTIFIER
• Ⅲ. OCC STRATEGY FOR POSITIVE-SEQUENCE CONVERTER OF PWM RECTIFIER
• Ⅳ. OCC STRATEGY FOR NEGATIVE-SEQUENCECONVERTER OF PWM RECTIFIER
• Ⅴ. UNBALANCED OCC SYSTEM FOR DUAL-CONVERTER PWM RECTIFIER
• Ⅵ. EXPERIMENTAL RESULTS
• Ⅶ. CONCLUSIONS
• REFERENCES

참고문헌 (Reference)

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