Improvement of Power Quality in A PMBLDC Motor Drive Using a Forward Buck Converter

Solid-state switch-mode rectification converters have reached a matured level for improving power quality in terms of powerfactor correction (PFC), reduced total harmonic distortion at input ac mains and precisely regulated dc output in buck, boost, buckboost and multilevel modes with unidirectional and bidirectional power flow. In this paper, an improved power quality converter employing conventional PI based& intelligence controlled ( FLC) forward buck converter topology is used to feed a permanent magnet brushless DC motor (PMBLDCM) drive. Normally, the PMBLDCM drive consists of a three-phase voltage source inverter (VSI) and a PMBLDCM which is fed from single-phase AC mains through a diode bridge rectifier (DBR). In this proposed system a conventional pi and fuzzy logic controlled based forward buck DC-DC converter is used after the DBR and it performs power factor correction (PFC) at input AC mains and voltage control at DC link, in a single-stage. The proposed PMBLDCM drive is designed, modeled and its performance is evaluated in Matlab-Simulink environment for an air conditioner (Air-Con) load. The speed of the compressor is controlled for efficient operation of the Air-Con which results in controlling the temperature in the conditioned area at the set point, effectively. Obtained results are presented to demonstrate an improved power quality of PFC converter based PMBLDCM drive in wide range of the speed control.