Phase Collaborative Interleaving Method to Reduce DC-Link Current Ripple in Switched Reluctance Machine Drive

An interleaved fixed switching frequency predictive current control method is proposed to reduce the amount of dc link capacitors for switched reluctance motor (SRM) drives. The proposed interleaving technique ensures a reduction of the dominant harmonic content of the dc-link current, concentrated around twice switching frequency $(2f_{sw})$, which in turn reduces the dc-link capacitor requirement significantly. Therefore, it also enables lowering the switching frequency of the converter for achieving higher system efficiency while maintaining significantly low dc-link capacitor requirement. The proposed method does not require phase current shaping which ensures no additional current stress on the inverter switches and the motor phase windings. Furthermore, no additional hardware requirement makes this approach very cost effective. Simulation results are provided to support the effectiveness of the proposed control technique.