engleski

Capacitive Energy Storage Device from Tram Auxiliary Power Supplies

Voltage drops of the catenary supply on trams are very frequent, every 2 minutes on average for the city of Zagreb. Durations of the voltage drops vary from less than 1 ms to seconds. The tram air-conditioning units are fed from the catenary through power converters and are limited in the number of start/stop sequences per hour. They have to be powered with a kind of uninterruptible power supply. That way the operation continues with no interruptions during voltage drops. A solution with capacitive energy storage is chosen. Sizing of the capacitive tank and the working principle of the accompanying DC-DC converter are shown. Characteristics of the equipment are measured while operational. When the capacitive storage device is used, the air-conditioning unit works without interruptions during voltage drops of up to 320 ms. Majority of voltage drops are shorter in duration and the number of interruptions is limited to the level that guarantees reliable operation of the air-conditioning unit.

DC power supplies ; capacitive energy storage ; catenary supplies

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