| 摘要 |
PURPOSE:To make an inverter into constant-current control as well as to make smooth regenerative operation for an electric car performable, by compensating an automatic voltage regulating system of electric-car voltage on the basis of a deviation output to be obtained in a way of comparing an electricity quantity having detected the electric-car line voltage with the setting electricity quantity. CONSTITUTION:At the time of operation of an electric car 6, supposing output voltage of a transducer 22 is lower than the setting voltage of an inverter voltage setter 24 and an electric current is not flowing in an inverter 8, voltage and current of an electric-car line 5 vary to a B characteristic when commercial supply voltage is high but to an A characteristic when it is low. Next, if a current Id of the electric-car line 5 decreases during operation with the A characteristic, coming to less tan the Id1, and an output current of a transducer 13 is smaller than the setting value of a circulating current setter 15, an amplifier 16 emits the specified voltage signal. Therefore, a fourth comparing circuit 26 outputs a deviation signal to be obtained out of the setting value of regenerative voltage setter 27 and an output signal of the amplifier 16 to a circuit 28, and with the deviation output made up of comparing the deviation signal with the output voltage of the transducer 22, an automatic voltage regulating circuit 31 performs phase control over the inverter 8, making constant-current control performable.
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