| 摘要 |
PURPOSE:To enable to control the input power factor and the DC side voltage of a converter in a wide range by controlling a DC side voltage with the waveform pattern of a voltage type inverter. CONSTITUTION:The operation of a voltage type inverter 13 is controlled by providing a star-connected 3-phase AC power source 11, a reactor 12, the voltage-type inverter 13, a ripple reducing capacitor 14, and a DC load 15, and providing an AC sensor 15 for detecting the voltage phase of the power source 11, a DC voltage sensor 17 for detecting the DC side voltage, an AC current sensor 18 for detecting the AC side current of the inverter 13, and a controller 19. Thus, the controller 19 inputs the AC power source voltage Vu detected by the sensor 16 and the current I detected by the sensor 18, delays the phase phi when the current I is delayed, and advances the phase when advanced. When the DC side voltage detected by the sensor 17 is low, it is controlled to reduce the coefficient K of the waveform pattern of the inverter 13.
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