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TEACHING POWER ELECTRONICS AT MONASH UNIVERSITY IN AN AUSTRALIAN CONTEXT
Peter Freere 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
A summary is given of conventional electrical engineering university education and a description of the employment scene for the graduates. The training requirements of graduates for three different industrial employers are given and the steps taken to meet some of these requirements are explained in detail. The steps taken include two training programmes, one an undergraduate final year course and the other a graduate training programme. The final year course teaches to design and construct a real product to specifications, whereas the graduate training programme employs a new graduate or postgraduate student on industrial projects which can be closely supervised for maximum benefit. Both programmes are described in detail and the conclusion developed as to future requirements.<br/>
Effect of AC Inductance on a Phase Shifted DC-DC Bridge Converter
Peter Freere,Wang Kong,Donald Grahame Holmes 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
Phase shifted DC-DC converters are a well established topology for producing an isolated DC output supply. However, the conventional topology with a DC output LC filter has some practical difficulties when issues such as diode reverse recovery effects, diode voltage ratings for wide ranging input voltages, and common mode EMI caused by the switched transformer output are considered. In many applications, these difficulties can be mitigated by moving the output filter inductor to the AC side before the bridge rectifier. However, this leads to alternative constraints of increased filter series voltage drop and higher filter capacitor current ripple. This paper presents design equations and a design process to determine which of these alternative filter arrangements better suits a particular DC-DC converter application.
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.
Taek il Oh,Peter Freere 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
This paper investigates the optimum configuration of a single phase induction motor to operate as a self excited generator. A single phase induction machine has two windings called the main and auxiliary winding. If those two windings are combined, the machine can produce up to its rated power at rated voltage when operating as a generator. This paper models a single phase induction machine as a generator. The experimental results support the computer simulation results and the modeling of a single phase induction generator. The optimal configuration was investigated.
Rotor Position Sensing Method for Switched Reluctance Motors Using an Indirect Sensor
Shin Duck-Shick,Yang Hyong-Yeol,Lim Young-Cheol,Freere Peter,Gurung Krishna The Korean Institute of Power Electronics 2005 JOURNAL OF POWER ELECTRONICS Vol.5 No.3
In this paper, a very low cost and robust sensing method for the rotor position of a TSRM(Toroidal Switched Reluctance Motors) is described. Position information of the rotor is essential for SRM drives. The rotor position sensor such as an opto-interrupter or high performance encoder is generally used for the estimation of rotor position. However, these discrete position sensors not only add complexity and cost to the system but also tend to reduce the reliability of the drive system. In order to solve these problems, in the proposed method, rotor position detection is achieved using voltage waveforms induced by the time varying flux linkage in the search coils, and then the appropriate phases are excited to drive the SRM. But the search coil's EMF is generated only when the motor rotates. Therefore the rotor position sensing method using squared Euclidean distance at a standstill is also examined. The simulation and experimental results are presented to verify the performance of the proposed method in this paper.
Rotor Position Sensing Method for Switched Reluctance Motors Using an Indirect Sensor
Duck-Shick Shin,Hyong-Yeol Yang,Young-Cheol Lim,Peter Freere,Krishna Gurung 전력전자학회 2005 JOURNAL OF POWER ELECTRONICS Vol.5 No.3
In this paper, a very low cost and robust sensing method for the rotor position of a TSRM(Toroidal Switched Reluctance Motors) is described. Position information of the rotor is essential for SRM drives. The rotor position sensor such as an opto-interrupter or high performance encoder is generally used for the estimation of rotor position. However, these discrete position sensors not only add complexity and cost to the system but also tend to reduce the reliability of the drive system.<br/> In order to solve these problems, in the proposed method, rotor position detection is achieved using voltage waveforms induced by the time varying flux linkage in the search coils, and then the appropriate phases are excited to drive the SRM.<br/> But the search coil’s EMF is generated only when the motor rotates. Therefore the rotor position sensing method using squared Euclidean distance at a standstill is also examined. The simulation and experimental results are presented to verify the performance of the proposed method in this paper.