| 摘要 |
PURPOSE:To make it unnecessary to control the phase, prevent the drop of power factor and a higher harmonics, and realize a low cost, by supplying the power, through a power rectifier without output voltage control function when the operation is less than a specific load rate, and through a power rectifier not to be controlled the phase when the operation is at the specific load or more. CONSTITUTION:In the operational area between the no load and a specific load rate, the AC power of a commercial frequency power source is supplied to an electric rolling stock through A/D converting by the first power rectifier, a diode rectifier 11, for example, which has no output voltage control function. On the other hand, in the operational area at a specific load rate or above, as well as the AC power of a commercial frequency power source is A/D converted, the second power rectifier, a thyristor rectifier 14, for example, which cannot control the phase, is operated, whose output power and the output power of the first rectifier 11 are added to feed to the electric rolling stock. In such a composition,the phase control of the power rectifiers is unnecessary, and a low cost is realized as well as the drop of power factor and a higher harmonics are prevented.
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