| 摘要 |
PURPOSE:To suppress uneven magnetization of a transformer for a DC component generated from a power system side by providing a converter output DC correction controller for introducing an electric amount for correcting an output voltage of a power converter based on a difference between a calculated output voltage DC component and a target value of the output voltage DC component. CONSTITUTION:A converter output DC calculator 32 detects necessary electric amounts Q1-Qn in order to obtain an output voltage DC component of a power converter 3, and calculates the output voltage DC component of the converter 3 from the detected amounts. A difference between an actually measured value of the DC component and the target value of the DC component is obtained by a subtracter 21, a correction amount of the output voltage of the converter 3 is calculated by a converter output DC correction controller 23, and an output voltage command value from a voltage/current controller 7 is so corrected as to cancel uneven magnetization. Thus, the uneven magnetization of the transformer can be suppressed for the DC component generated from a power system side. |
