| 摘要 |
PROBLEM TO BE SOLVED: To provide a power conversion apparatus capable of preventing the occurrence of an excess current by quickly responding if an abnormality occurs in a grid to abruptly change a grid voltage, and suppressing the output of an unbalance component or a harmonic component in a normal time. SOLUTION: Filters 15 and 16 input a detection voltage of the grid through a three-phase/dq axes converter 5. A grid abnormality determination means 17 inputs one of the outputs of the three-phase/dq axes converter 5, and outputs a time constant switching command to the filters 15 and 16 when the change rate exceeds a prescribed value. The filters 15 and 16 switch a response time constant to a long value in a normal time or to a short value at grid abnormality under the time constant switching command. COPYRIGHT: (C)2004,JPO
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