| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable a power conversion device to resume operation at high speed while performing overvoltage suppression and suppressing overcurrent in resuming operation in a voltage unbalance status of a power system. <P>SOLUTION: Voltage amplitude of a phase to become overvoltage is suppressed, and overcurrent is suppressed by: providing an overcurrent suppression dead zone implement 115 which has first operation thresholds Vth1 and Φth1 and an overvoltage suppression dead zone implement 116 which has second operation thresholds Vth2 and Φth2 to make Vth1>Vth2; correcting voltage instruction value Va*-Vc* of a power inverter circuit 1, when either of an amplitude deviation ΔVa-ΔVc or phase deviation ΦVa-ΦVc exceeds Vth1 or Vth2; and controlling the power inverter circuit 1 by a signal of a pulse width modulator 107 which inputs this corrected value. <P>COPYRIGHT: (C)2009,JPO&INPIT |
