Abstract
In this paper a Piecewise Direct Instantaneous Energy Control (PDIEC) strategy is proposed for torque ripple and DC-link capacitor reduction in Switched Reluctance Motor (SRM) drive systems. DC-link energy flow in a conventional SRM drive system contains high frequency switching harmonics, as well as commutation induced low frequency harmonics, which are caused by magnetization of the incoming phase and demagnetization of the outgoing phase during a commutation period. If the SRM drive is controlled to produce constant output torque, the question of how to reduce the low frequency ripple of the input energy is equivalent to that of how to eliminate the low frequency harmonics in the stored field energy of the SRM. Therefore, based on the Direct Instantaneous Torque Control (DITC) technique, a new control technique is proposed to control the stored field energy and the instantaneous torque at the same time.
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