D.A. Grant

Publications (3)0 Total impact

• Conference Proceeding: A theoretical and practical consideration of optimised input filter design for a low loss matrix converter

  P.W. Wheeler, H. Zhang, D.A. Grant
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  ABSTRACT: The paper reports the construction and testing of a matrix converter in which novel switching methods are employed to minimise the losses in the switching devices. A mixture of hard and soft commutation is used during each cycle of the output waveform. This permits losses to be reduced to a minimum while waveform quality is enhanced. IGBTs are used as the switching devices and a microcontroller generates the switching waveforms and provides control. The problems associated with input current filtering to comply with existing and possible future European EMC regulations are investigated. The paper compares disturbance voltage results from mathematical theory, computer simulation, and practical measurements from a power level converter under microprocessor control. Possible designs for an input filter to meet the European standards are considered. The relationship between the converter switching frequency and the cost of the input filter is explored
  Electromagnetic Compatibility, 1994., Ninth International Conference on; 10/1994
• Conference Proceeding: A low loss matrix converter for AC variable-speed drives

  P.W. Wheeler, D.A. Grant
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  ABSTRACT: This paper reports the construction and testing of a matrix power convertor in which novel switching methods are employed to minimise the losses in the switching devices. A mixture of hard and soft commutation is used during each cycle of the output waveform. This permits losses to be reduced to a minimum while waveform quality is enhanced. It is demonstrated that at elevated switching frequencies the efficiency of a matrix power converter can be comparable to that of traditional inverter drives. IGBTs are used as the switching devices and a microcontroller is used to generate the switching waveforms and provide control. Reactive components have been minimised so that the matrix converter is now approaching an all-silicon solution to AC-AC power conversion. Practical results are presented
  Power Electronics and Applications, 1993., Fifth European Conference on; 10/1993
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  Conference Proceeding: Reducing the semiconductor losses in a matrix converter

  P.W. Wheeler, D.A. Grant
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  ABSTRACT: The authors look at the implementation of a matrix converter switching strategy under microprocessor control and using IGBTs. The effects of different switching methodologies for the converter are investigated. The power losses in the switching devices of a matrix converter are analysed and quantified. The effects of different switching frequencies and approaches to PWM generation are considered. Comparisons are drawn with a conventional inverter in terms of efficiency and relative cost. The conduction losses in the matrix converter are higher than the conduction losses in a standard inverter. Methods of reducing the switching losses in a matrix converter are proposed. The implementation of these methods means that the total losses in the matrix converter can be less than those in an inverter drive at high switching frequencies. It is shown that even at lower switching frequencies the losses in the matrix converter are not significantly greater than those in an inverter drive
  Variable Speed Drives and Motion Control, IEE Colloquium on; 12/1992