Power Factor Correction of BL-CSC Converter with fuzzy logic controller Fed BLDC Motor Drive

Abstract

The proposed BL-CSC converter operating in a discontinuous inductor current mode is used to achieve a unity power factor at the AC mains using a single voltage sensor. The speed of BLDC motor is controlled by varying the DC bus voltage of the voltage source inverter (VSI) feeding BLDC motor via a PFC converter. Therefore, the BLDC motor is electronically commutated such that the VSI operates in fundamental frequency switching for reduced switching losses. Moreover, the bridgeless configuration of CSC converter offers low conduction losses due to partial elimination of diode bridge rectifier at the front end. The switching losses in the VSI have been reduced by the use of fundamental frequency switching by electronically commutating the BLDC motor. Moreover the use of front end CSC improves the power factor at AC mains. a design methodology is introduced that blends the classical PI and the fuzzy controllers in an intelligent way and thus a new intelligent controller has been achieved. Basically, in this design methodology, the classical PID and fuzzy controller have been combined by a blending mechanism that depends on a certain function of actuating error. Moreover, an intelligent switching scheme is induced on the blending mechanism that makes a decision upon the priority of the two controller parts; namely, the classical PID and the fuzzy constituents. The simulations done on various processes using the new fuzzy is PID controller provides ‘better’ system responses in terms of transient and steady-state performances when compared to the pure classical PID or the pure fuzzy controller applications. The performance graph has been plotted for the total harmonic distortion (THD) and the power factor (PF). A front end Canonical switching cell converter operating in Discontinuous Inductor Current Mode (DICM) is proposed for PFC operation at AC mains. Fuzzy logic is introduced in order to suppress the chattering and enhancing the robustness of the PFC control system. The performance has been evaluated using Matlab-Simulink.