Generator Operation of Switched Reluctance Machine Drives for Electric Vehicles | ||||||
Author(s) | R. B. Inderka; M. Menne; R. W. De Doncker | |||||
Abstract | This contribution deals with the stringent control requirements of switched reluctance generators for electric vehicle (EV) applications. In EV aplications, switched reluctance machines have to operate in generating mode over a wide torque-speed range, i.e. in the current controlled chopping mode at low speed as well as in the voltage controlled single-pulse operation at high speed. In addition, the d.c.-bus voltage varies with the load as a function of the energy source. This voltage variation requires continuous variable adaptation when a wide speed range is required. Furthermore, a novel control strategy to implement a three-level hysteresis current regulator for generating mode is presented. This technique improves drive efficiency up to 8% over a wide operating area. In addition, the problem of uncontrollable overcurrents due to excessive back-EMF voltage during generating mode is discussed. Therefore, the variables, which are necessary to control the switched reluctance drive, and the resulting efficiency characteristics are presented. |
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Type | Members Only | |||||
Date | Last modified 2006-04-19 by System | |||||
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