| 摘要 |
PURPOSE:To control effective power at high speed with high accuracy by installing a voltage controller outputting an effective-voltage operation signal controlling the deviation of an effective-voltage reference signal and a voltage feedback signal so as to be brought to zero or kept constant. CONSTITUTION:A voltage controller 11c outputs an effective-power operation signal Vp controlling the deviation of an effective-voltage reference signal Vdr input from a divider 11a and a voltage feedback signal Vf acquired by compensating a DC voltage signal Vd by a voltage drop section by commutating reactance so as to be brought to zero or kept constant. A reactive-voltage operation signal Vq related to a value obtained by dividing quantity as the reference of reactive power by DC currents is set by a reactive-voltage reference generator 12. A firing angle alpha is arithmetically operated from the rate of effective and reactive voltage operation signals Vp and Vq and the ratio of the effective voltage to non-load maximum DC voltage in a firing- angle computing element 7A. A phase controller 8A transmits ignition pulses corresponding to the phase of the firing angle alpha over a power converter 2. Effective power can be controlled univocally by the control of DC voltage determined by the firing angle alpha. Accordingly, effective power can be controlled at high speed with high accuracy by voltage control using the DC voltage. |
