Design and Simulation of a Soft Switched Dc Boost Converter for Switched Reluctance Motor

Problem statement: This study presents the design and simulation of a soft switched boost converter for a switched reluctance motor with a closed loop controller. A soft switching scheme is proposed in the converter with minimum components, which reduces the switching loss and stress across the switch so that the harmonic generation is reduced in the output. The switch used in this converter switched ON at zero current and switched OFF at zero voltage. Approach: Most of the research was done on the power converter circuit of the SRM to control the speed. But in the proposed system a soft switched boost converter was designed to regulate the input voltage to SRM for any line variations and a power converter is used to control the speed of SRM. The PI controller was used as closed loop controllers, which improves the speed control of the switched reluctance motor for any load and regulates the input voltage to SRM for any line variations. The duty cycle of the switch is controlled by PI controller using PWM technique. A 500W/50KHz PWM based soft switched boost converter was designed and simulated for 6/4 pole 3 phase SRM with variable loads. The results were simulated using MATLAB SIMULINK. Results: The output of the soft switched dc converter gives a constant output voltage for any line variations, so that the input voltage to SRM is constant. The output speed of the SRM is controlled using PI controller and rotor current. Conclusion: The soft switched dc converter regulates the input supply and a power converter control the speed of Switched reluctance motor simultaneously.