Dynamic Performance of DC-DC-AC Boost Switched Capacitor Converter Fed Single Phase Induction Motor

Abstract

Abstract: Single phase induction motor mostly exhibits a low starting torque and also produces a significant level of torque pulsations during a steady state acceleration time. These drawbacks can be mitigated using an improved drive strategy. The drive scheme applied in this work employed a DC-DC-AC boost switched capacitor converter to drive a 0.25 horse power single phase induction motor at a regulated duty cycle of 0.5 and 0.75. The motor was simulated under steady state and transient state at a varying load torque of 0-22.5Nm. The converter topology integrates the inductive switching cell with a switched capacitor in performing a direct energy conversion at a high output voltage gain. A simulation process carried out on the complete drive model showed that an enhanced starting torque and a speed regulation values of 0.2255 and 0.9271 were obtained at 0.5 and 0.75 duty cycle under steady state whereas 0.2094 and 0.2096 were obtained under transient state. The results obtained also showed that different efficiency values of 82.86% and 76.79% were achieved at 0.75 and 0.5 duty cycle. A stable motor operation with an improved voltage gain, appreciable power output and reduced torque pulsations were achieved at 0.75 duty cycle. All simulation processes were accomplished in MATLAB/SIMULINK 2014.