In this paper an improved power quality buckboost converter fed permanent magnet brushless DC motor
(PMBLDCM) drive is employed for adjustable speed operation
of PMBLDCM. A single-phase, single-switch AC-DC converter
topology based on non-isolated buck-boost converter is
employed for power factor correction (PFC) and operated with
voltage follower control in discontinuous conduction mode
(DCM) operation for sensor reduction. This PFC controller
ensures near unity power factor in wide speed range of the
drive while restricting the total harmonic distortion (THD) in
AC mains current within the specified limits of the IEC
standard. The proposed control scheme with PFC converter
based PMBLDCM drive is designed, modeled and simulated in
Matlab-Simulink environment for an air conditioner
compressor driven through a 2 kW, 5.2 Nm PMBLDC motor.
The obtained results are presented to validate the effectiveness
of the proposed control scheme for power quality improvement
at AC mains.