Power quality of electric bus battery chargers
- Enerpro Inc., Goleta, CA (United States)
Successful demonstration programs in Santa Barbara, California and elsewhere point to the possibility of substantial fleets of battery powered buses. Batteries are usually charged simultaneously during off-peak hours so that the charger input rectifier becomes the dominant component of the transit bus facility electrical load. In the future, total harmonic distortion (THD) of the three-phase rectifier current will become a primary charger selection factor as more electrical utilities adopt the power quality recommendations of IEEE Standard 519. This paper describes a power quality measurement survey of three charger types performed at the Santa Barbara Municipal Transportation District`s electric bus facility. These chargers were: 6-pulse thyristor rectifier, 12-pulse thyristor rectifier and 6-pulse diode rectifier/transistor PWM chopper. Power quality testing showed that the 6-thyristor rectifier and the 6-diode rectifier/transistor chopper have THDs that exceed IEEE 519 limits by a wide margin. Only the 12-thyristor rectifier provides a low THD with little or no filtering of the AC input current. As an additional benefit, the 12-pulse thyristor rectifier produces smooth battery current with a relatively small DC choke. 4 refs.
- OSTI ID:
- 418637
- Report Number(s):
- CONF-9409454-; ISBN 0-931033-53-5; TRN: IM9703%%33
- Resource Relation:
- Conference: Mass transit system compatibility `94, Dallas, TX (United States), 17-22 Sep 1994; Other Information: PBD: 1994; Related Information: Is Part Of Proceedings of mass transit system cmpatibility `94; PB: 419 p.
- Country of Publication:
- United States
- Language:
- English
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