| 摘要 |
<p>PURPOSE:To control a system voltage and a system phase stably, by controlling the output voltage of a frequency converter through a phase control signal, which converges, the deviation between the voltage signal sensed through a voltage sensing means and a voltage reference signal used as the reference of the sensed voltage signal, into zero, and by also changing, in that case, the control gain of the aforesaid voltage control system, according to the magnitude of the sensed voltage signal. CONSTITUTION:A comparator 6 compares a voltage signal inputted from a voltage sensor 4 with a voltage reference signal used as the reference of a primary voltage, the voltage reference signal being inputted from a first voltage reference generator 5. Then, the deviation ev between the sensed voltage signal and the voltage reference signal is inputted to a voltage controller 9. A gain regulator 7 changes the control gain of the voltage controller 9, according to the deviation between a second voltage reference signal and the voltage signal sensed by a voltage sensor 4. The voltage controller 9 inputs a gain obtained from the gain regulator 7 and the voltage deviation (ev) obtained from the comparator 6, and gives to a phase controller 10 a phase control signal obtained from the deviation multiplied by the control gain. The phase controller 10 controls the amplitude and phase of the output voltage of the frequency converter 3, according to the phase control signal.</p> |
