Modeling of the Power Factor Correction of 8/6 Poles Switched Reluctance Motors

Abstract:

In the traditional power topology structure of switched reluctance motor (SRM), the ideal DC bus voltage is supplied by the circuit which is composed by a rectifier bridge and a filter capacitor. The capacitor is usually large to reduce the torque ripple, so the conducting time of AC source is very short and the power factor is reductive. A novel power topology structure of SRM is presented in this paper, and it is applied to the traditional split-phase structure to carry out power factor correction (PFC). This paper sets up the two-phase simultaneous excitation of four phases 8/6 poles SRD based on MATLAB/SIMULINK, and analyzes the current, voltage, torque etc. of two-phase excitation. The simulation results proves that the novel topology is not only improving the power factor but also optimizing the motor starting performance and efficiency, and it provides a feasible way for the study of energy conservation and efficient SRM.

• Periodical: Advanced Materials Research (Volume 505)
• Pages: 209-215
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.505.209
• Online since: April 2012
• Authors: Jie Gao, He Xu Sun, Bing Gao, Lin He, Yan Dong
• Keywords: Power Factor Correction (PFC), Simulink, Single-Phase Excitation, Switched Reluctance Motor (SRM), Two-Phase Excitation

References

[7] The role of VC tube in Fig. 4 is in order to achieve a new form of compensation. Fig.7 shows compensation schematic, VC is to choose voltage for the power winding, when VC turns on each phase is powered by a capacitor otherwise by AC power supply. The relationship between the source voltage and capacitance voltage is shown in Fig. 6, when the supply voltage is 0, the phase voltage is provided entirely by the capacitor voltage, so (2) Where θd is conduction angle, so (3) Simulation Results This compensation not only reduces the torque ripple due to the voltage fluctuation, but also improves the power factor of control system. Fig.8 shows the simulation curve based on MATLAB/SIMULINK that SRM operated on dual closed loop control, and considering the two-phase excitation mode power factor correction. And the speed is given as 2000rpm, SRM load torque is 7N.m. Fig. 8 The input voltage, input current, trigger logic per phase, VC compensator logic, output current and bus voltage of two-phase excitation SRM under PFC AC input voltage is the sine curve with amplitude of 310V, while the input side of the current curve from the traditional single-pulse envelope curve to the form of multi-pulse which improves voltage phase to follow the sine curve, the average value is the same as cycle single pulse. The third screen in Fig.7 shows in the initial turn-on time of each phase, VC is always conducting and its amplitude is decided by initial phase of conduction time, the conduction time can be calculated by the above formula. Phase current during normal operation is shown in screen 4. By way of compensation, the phase voltage is approximately the average DC as shown in screen 5. Conclusion This paper focuses on the traditional rectifier filter mode in SRM power topology power supply side current distortion in the serious problem of low power factor, based on two-phase SRM excitation mode of the time, switched reluctance motor drive circuit of the power topology of the power factor correction. Topology through the work of the new power mode of presentation, combined with the capacitor voltage of each phase voltage compensation analysis, making the supply side of the current waveform envelope of a sine wave burst approximation, which greatly improved the power factor [10]. At the same time as the input AC side of the case directly, through the compensation capacitor voltage has been more stable phase voltage, reducing the torque ripple and improve the system stability. Refernces

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