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A novel PWM (pulse-width-modulated) technique for the three-phase PWM converter/inverter is proposed. The instantaneous active and reactive power are used as the PWM control variables instead of the three-phase line currents. They are directly controlled by the PWM switching from the appropriate voltage vector selection. The features of the proposed PWM technique are simple construction, high efficiency, high response, and wide application. The principle of the PWM technique, the PWM control system, the control circuit, the control range, and the design indexes are described. Some simulation results and experimental results are shown.>
Tokuo Ohnishi (Mon,) studied this question.