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High efficiency motors play a key role in energy conservation around the world. Understanding the efficiency requirements of IEC and NEMA is crucial in both producing and purchasing the right type of electric motors to meet various efficiency requirements. In addition to the efficiency values, understanding the tolerances that are associated with these efficiencies is important as well. As shown in...
The rotor of an induction motor is designed to provide adequate starting torque and limit starting current when the load is being accelerated by the motor. These starting requirements on the rotor force design engineers to employ special shape rotor bars, or high resistance bars and thereby reduce motor efficiency and increase motor temperature rise. In addition to the benefits provided by an adjustable...
Power-quality phenomena such as voltage sag are observed at several substations to obtain an overview of the general network state and quality of power supply. Presently, collections of data from disturbance recorders involved long and tedious downloading process through telephone line. Usage of Internet protocols consumed bandwidth and causes traffic congestion of the wide area network. This paper...
In power utilities, grid operators monitor power-quality phenomena such as voltage sag at several substations to obtain an overview of the general network state and evolution of power quality. Collections of these huge online data from disturbance recorders involved long and tedious downloading process, usage of Internet protocols consumed bandwidth and causes traffic congestion and collisions with...
This paper focuses on the development of maximum wind power extraction strategies for variable speed constant frequency (VSCF) grid-connected wind power generation systems with a doubly fed induction generator (DFIG). A new optimal control method is proposed by controlling the generator stator active and reactive power, which is based on the condition of the system operation for not only the extracted...
This paper focuses on the development of maximum wind power extraction strategies for variable speed constant frequency (VSCF) grid-connected wind power generation systems with a doubly fed induction generator (DFIG). A new optimal control method is proposed by controlling the generator stator active and reactive power, which is based on the condition of the system operation for not only the extracted...
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