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This paper describes a novel operation performance of a brushless DC motor (BLDC), fed by a Hybrid Distributed Generation System (HDGS). The HDGS is accompanied with photovoltaic (PV) array, fuel cell stacks and a battery to supply a fixed power for driving a BLDC motor. The HDGS employs a novel multi-input DC boost converter for utilizing DG sources in a unified structure. In this structure each switching cycle of proposed boost converter is divided into five switching periods that introduce five different duty ratios. Utilizing these duty ratios result in regulating the PV/FC/Battery powers. Hence, a fixed electrical power for the BLDC motor is achieved. Due to fixed power capability of the system in different environmental conditions, the BLDC motor will be able to run at its nominal power, particle swarm optimization (PSO) has been used to regulate the PID parameter of speed controller in order to realize better dynamic response. Reducing the torque ripple and improving current control capability of BLDC motor, hysteresis current control with current shaping is applied. The proposed system is suitable in remote areas for applications such as cooling fan, agricultural water pumping systems and related home applications.
Date of Conference: 8-11 May 2011