Voltage source PWM inverters have been applied to such fields as power supplies and motor drivers. This is because: (1) such inverters are well adapted to high-speed self turn-off switching devices that, as solid-state power converters, are provided with recently developed advanced circuits; and (2) they are operated stably and can be controlled well. The authors have fabricated a prototype power supply unit based on a voltage-source PWM inverter to simulate harmonic trouble and power failure over the power distribution system. The prototype power supply unit has been delivered to an electric power company and is running successfully. Here, they present a summary of the power supply unit.
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