Abstract
High torque ripple in Switch Reluctance Machines (SRMs) increases the ripple in the dc input current which eventually increases the required capacitor size on the inverter. The amount of capacitors used in the drive have a significant impact on the overall volumetric power density of the drive. This paper investigates the DC link current ripple in SRM drives and proposes a control algorithm to achieve an acceptable range of DC link ripple without affecting the machine performance. As a result, higher volumetric power density (kW/L) and more compact packaging design can be achieved. The proposed algorithm acquires the ripple component of the dc link current by processing through a high pass filter. The ripple current is processed through a closed loop controller to shape the reference phase currents for each phase. The proposed algorithm is able to suppress the DC link ripple significantly at wide speed range of operation. Simulation results are provided to prove the effectiveness of the proposed control technique.
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