| 摘要 |
A control method of the invention is formed with the steps of when a margin angle gamma reaches a given minimum margin angle gamma min during the operation of a rectifier and inverter, a shunt reactor is disconnected from, or a shunt capacitor is connected to, an AC line of the inverter, and when the margin angle gamma exceeds the minimum margin angle gamma min by a predetermined value, the shunt reactor is connected to, or the shunt capacitor is disconnected from, the AC line.
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