| 摘要 |
PROBLEM TO BE SOLVED: To provide a PWM control device for self-exciting power converter unit that can output a voltage with an optimum PWM pulse waveform suited for the purpose. SOLUTION: A PWM control device 10 used for a self-exciting power converter unit 1 is provided with phase detection means 5 and 6 of an AC voltage, an AC current detection means 4, a means 7 for calculating the effective power/ reactive power of an AC current, means 8 and 9 for calculating the effective power/reactive power of a voltage command signal based on the effective power/reactive power of the AC current and a command value, means 17 and 18 for calculating an amplitude value and a phase from the effective power/reactive power of the voltage command signal, a means 21 for obtaining the start/end phase of each pulse of a specific PWM pulse waveform based on the amplitude value, and means 19, 20, 22, 23, and 24 for outputting the control signal of the PWM pulse, based on the starting/ending phase of each pulse and the phase of the voltage command signal. |
