Comparison of Average Current Controlled PFC SEPIC and CUK Converter Feeding Current Controlled SRM

Abstract

In this paper, current control of 6/4 switched reluctance motor (SRM) fed by both power factor correction (PFC) SEPIC and CUK converter is realised and asymmetric bridge converter is used to drive SRM. Furthermore, SEPIC and CUK DC-DC converters are connected in series to diode bridge rectifier in order to build PFC converters. Average current control of PFC converters is carried out by PI algorithm and both converters are operated at continuous conduction mode (CCM). Besides, switching frequency of PFC and asymmetric bridge converters is 62, 9 kHz with 5750 W power. Studies are conducted by using MATLAB/Simulink software. Total harmonic distortions (THD)s of grid current, grid power factor (PF) and output voltages of the converters are compared. Also, THDs of grid current of each converter are compared by IEEE 519-2014 standard. In addition, current waveform and flux of SRM phases are shown. It is validated by simulations that PFC CUK converter gives better result with 9.08% THD, 0.998 PF than PFC SEPIC converter having 9.61% THD and 0.997 PF. Furthermore, both converters provide the limit defined by standards.

Keywords

• CUK
• PFC
• SEPIC
• SRM
• THD