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P. Freere 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
This paper looks at aspects of the torque, switching frequency, minimum transistor conduction state times when using hysteresis current control to drive a vector controlled permanent magnet synchronous motor. Implications of the zero voltage vector on the switching frequency is considered. For a motor with little ability to flux weaken, a phase advance method of increasing high speed performance is demonstrated.
Experimental and Simulation Results for Sliding Mode Dynamic Wind Turbine Control using a DC Chopper
G.Riahy,P.Freere,D.G.Holmes 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
Wind speeds can vary rapidly and wind turbines cannot easily follow these variations because of their inertia and aerodynamic characteristics. For maximum energy extraction, the turbine blades should operate at their optimum tip speed ratio, but with rapid changes in wind speed, this is usually not possible. To improve the energy extraction from turbulent wind, it is necessary to establish an effective measure of the high frequency component of the wind, and then to use this measure to optimise the operation of the turbine controller for maximum energy extraction. This paper presents an approach for combining readings from three anemometers into a composite wind speed measurement, and using this signal to control the operation of a permanent magnet generator to achieve maximum energy extraction. The method combines simulation and experimental investigations into a heuristic algorithm, and demonstrates its effectiveness with field trials.<br/>
K. Gurung,P. Freere 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
This paper addresses the effect of low power factor load on the voltage regulation of a three phase self excited induction generator feeding a single phase load. The steady state model of an induction generator based on symmetrical component and rotating field theories has been used for the purpose of analysis and comparison. The simulated results are supported by experimental results.