| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a controller for electric power conversion equipment capable of solving problems even when the equipment is operated at low carrier frequency. <P>SOLUTION: In the controller for electric power conversion equipment, electric power converters for each phase consist of a plurality of cell inverters, one ends of the plurality of cell inverters are connected to a commercial power supply via a multiple-phase transformer, the other ends are connected to a load, and each of the cell inverters defines a switching time for a semiconductor element configuring the cell inverter at a time point where step-like voltage command simulating the sinusoidal waveform and a carrier signal with the triangle wave cross each other. Deviation in a basic phase of an output voltage generated by a time difference between the first time when the voltage command with the sinusoidal waveform and the carrier signal with the triangle wave cross each other and the second time when the step-like voltage command simulating the sinusoidal waveform and the carrier signal with the triangle wave cross each other, is corrected to employ the voltage command. <P>COPYRIGHT: (C)2012,JPO&INPIT |
