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In this paper, a novel low-cost digital controller to drive a buck converter fed voltage source inverter (VSI) based brushless DC (BLDC) machine has been proposed. This controller is designed to be implemented solely in digital platforms and has multiple numbers of predefined discrete duty ratios. In conjunction with buck converter fed VSI, the controller is beneficial to enhance the speed and resultant torque profile of BLDC motor drive as compared to conventional bang-bang or on-off controller. The controller also incorporates a current limiter to avoid the over-current loading of the motor. The sampling time and the design of the current limiter are mathematically derived in the paper. The working efficiency of the developed controller for the BLDC motor drive has been examined for various vital and steady-state conditions. The speed ripples, settling time, tolerance to the commanded speed, and load variations are validated and presented in this paper. The proposed controller has been performed and implemented in the field-programmable gate array platform and compared to generic pre-existing controllers to validate the cost-effectiveness of the controller.

This paper presents the current control of selfexcited induction generator(SEIG).The self excited induction generator is an isolated power source whose terminal voltage and frequency are controlling by the excitation capacitance or the load impedance this is calculating the minimum excitation capacitance using the equivalent circuit for analyze the steady state operation of self-excited induction generator. A new method based on hybrid active filter for controlling the current and power quality of the self excited induction generator. The Hybrid active power filter was implemented using a shunt active power filter and connected to the wind generator and loads in order to compensate the current harmonics and reactive power. A hybrid filter which is a combination of series active filter and shunt passive filter. Among the various available combinations, active-passive combination is effective as it has the advantages of both active and passive filters. The characteristics of the passive filter are improved avoiding the problems of series and parallel resonances. The series APF with a shunt connected passive filter is widely used due to the above advantages. Thus, the control of series APF with shunt connected passive filter is studied and analyzed the current control. This paper presents a new control strategy based on hybrid active power filter for controlling the current of selfexcited induction generator when generator is connected to a nonlinear load. This paper also represents the analysis and modeling of dynamic model of SEIG. Basically a strategy based on an active power filter (APF) for controlling the current and power quality of the self-excited induction generator (SEIG) has been presented in this paper.

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