| 摘要 |
Intended is to suppress the voltage drop of a line wire, to absorb the regenerative power of an electric car and to prevent the regenerative invalidness of the electric car, without inviting the upsizing and high cost of a DC power storage device. The terminal voltage (or the standby voltage) of an electric double-layer capacitor EDLC is set close to the upper-limit voltage of the rated voltage range of the line wire at the no-load time and the ordinary load time of a feeding line system. When the line wire voltage exceeds the upper-limit voltage of the rated voltage range, the regenerative power is absorbed by the electric double-layer capacitor, and, in parallel with this, the terminal voltage of the electric double-layer capacitor is prevented (i.e., the regenerative invalidness prevention) from exceeding its maximum by a regenerative current throttling action of the electric car. When the line wire voltage is lower than the lower-limit voltage of the rated voltage range, the line wire voltage is so held (i.e., the voltage drop suppression) as not to become lower than the lower limit of the rated voltage range by the discharge power from the electric double-layer capacitor due to the voltage lowering and boosting actions of a voltage lowering and boosting chopper. |
