Abstract
Problem statement: This study presents the design and simulation of a soft switched boost converter for a switched reluctance motor with a cl osed 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 i s 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 c ontrol 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 out put 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 co nverter control the speed of Switched reluctance motor simultaneously.
Highlights
Switched Reluctance Motor Drives (SRD) are become popular compared to conventional ac or dc motor drives due to their simple construction, robustness, high efficiency and high power density
The function of flux linkage depending on phase current and rotor position represents the key characteristic of the Switched Reluctance Motors (SRM) and it is difficult to describe such a relationship due to the effects of magnetic saturation and double saliency of the construction
Two PI controllers are designed and simulated to regulate the input voltage fed to srm and control the speed of srm
Summary
Switched Reluctance Motor Drives (SRD) are become popular compared to conventional ac or dc motor drives due to their simple construction, robustness, high efficiency and high power density. The function of flux linkage depending on phase current and rotor position represents the key characteristic of the Switched Reluctance Motors (SRM) and it is difficult to describe such a relationship due to the effects of magnetic saturation and double saliency of the construction. In order to improve its performance some advanced control strategies have been proposed, such as current or flux linkage profile control. To achieve these strategies the motor phase current or phase flux linkage should be controlled precisely. All these require increasing the switching frequency of converter to upgrade stability and dynamic response speed. The higher switching frequency may cause the higher switching losses, higher Electro-Magnetic Interference (EMI) and the lower overall efficiency
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