Supplying a Brushless DC Motor by z-source PV power inverter with FLC-IC MPPT by DTC drive

Abstract

This paper describes the optimal operation performance of a Brushless DC Motor (BLDC) fed by a z-source inverter accompanying with photovoltaic (PV) system, driving a water pumping system. The proposed system employs a Z-Source Inverter (ZSI) to extract the Maximum Power from a Photovoltaic array to supply the BLDC motor simultaneously. Utilizing the ZSI provides some advantages such as high efficiency and low cost. In order to achieve an accurate Maximum Power Point Tracking (MPPT) of the PV array, fuzzy logic controller(FLC) is applied to attain an appropriate variable step size in incremental conductance method. Direct torque control (DTC) has some benefits such as faster torque response and reduced torque ripple for driving the BLDC motor. Because of ignoring stator flux linkage of DTC in constant torque region, driving of BLDC motor is not complicated. The effectiveness of proposed system is evaluated by simulation results.