The paper presents an efficient speed control of brushless DC (BLDC) motor drive for photo-voltaic (PV) system fed system. A high-gain DC-DC converter is employed in the system to boost the PV system low output voltage to a level required for the drive system. High-gain DC-DC converter is operated in closed-loop mode to attain accurate and steady output. The converter (VSI) for BLDC is switched at fundamental frequency and thus reducing high frequency switching losses. Internal current control method is developed and employed for the speed control of PV fed BLDC motor. The appropriateness of the internal current controller for the speed control of PV fed BLDC motor is verified for increamental speed with fixed torque and decreamental speed with fixed torque operating conditions. The system is developed and results are developed using MATLAB/SIMULINK software. Keyword: BLDC motor INTRODUCTIONDevelopment in power electronic section of electrical engineering has led to developments in special machines and one such kind is brushless DC (BLDC) motor. The construction of brushless DC motor is quiet similar to that of conventional DC motor but the absence of brush-commutator assembly makes BLDC motor more efficient in operation. The BLDC motor is electrically commutated by power switches instead of brushes. Compared with a brushed DC motor or an induction motor, the BLDC motor has many advantages: Higher efficiency and reliability, Lower acoustic noise, Smaller and lighter construction, Greater dynamic response, Better speed versus torque characteristics, higher speed range, longer life. A rotor consists of a shaft and a hub with permanent magnets arranged to form between two to eight pole pairs that alternate between north and south poles [1], [2]. There are multiple magnet materials, such as ferrous mixtures and rare-earth alloys. Ferrite magnets are traditional and relatively inexpensive, though rare-earth alloy magnets are becoming increasingly popular because of their high magnetic density. The higher density helps to shrink rotors while maintaining high relative torque when compared to similar ferrite magnets.BLDC motor consists of an internal shaft position sensor which initiates the control of phase excitation and time of energization. Conventional DC motor employs mechanical commutator but BLDC motor instead uses electronic commutator for its commutation making BLDC a maintenance-free motor. The two types of BLDC motor are classified based on their shape of back-EMF viz., trapezoidal and sinusoidal motors [3], [4]. The back EMF of trapezoidal BLDC motor is trapezoidal in shape and to obtain trapezoidal

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This paper presents a comparative analysis of three control algorithms for a wind turbine generator using a variable speed permanent magnet synchronous generator (PMSG). The design methodologies of the conventional PI based controller, the Taylor

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