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Newton, Christopher
Languages: English
Types: Unknown
This thesis describes an investigation of three and five level diode clamped inverters for motor drive applications. The work was completed as a PhD project at the University of Nottingham with funding from EPSRC and Heenan Drives Ltd. \ud \ud The investigation of the three level converter describes the design, development, control and operation of an 11kW prototype. Included in the design is a review of typical switching strategies employed for control of the output voltage. New improvements to the sub-harmonic pulse width modulation method are presented which allow an improved output waveform to be obtained. The problem of DC link capacitor voltage balancing (Neutral Point Control) is addressed and a novel balancing control method is presented based on the addition of a DC offset to the modulation pattern. This method is verified through mathematical analysis and experimental operation. The operational limits of the control are analysed. Improvements to the technique are presented to expand its operating limits. \ud \ud The development of a prototype five level converter is then described. The design again features improvements to the sub-harmonic modulation strategy to provide enhanced output waveform generation, particularly for transient operation. The current demands on the DC link capacitors for the five level arrangement are analysed and it is concluded that the capacitors cannot be regulated by simple modifications to the output switching pattern. \ud \ud A novel circuit is presented to achieve capacitor balancing within the DC link. The circuit behaviour is described and analysed. Operation is confirmed through simulation and experimental implementation. High dynamic performance is demonstrated via the use of a vector controlled induction motor. Neutral point control is successfully achieved through a similar method to that used for the three level inverter. \ud \ud Having demonstrated the principle of operation of the three and five level inverters on low voltage prototypes, the thesis concludes with a review of the main considerations required to implement the configurations as medium voltage drives.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • A2.4 References
    • [1] "Matlab Reference Guide", The Math Works Inc., 1992.
    • [2] "Simulink User's Guide", The Math Works Inc., 1992.
    • [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] A. I. Alolah, L. N. Hulley, W. Shepherd, "A Three-Phase Neutral Point Clamped Inverter for Motor Control", IEEE Transactions on Power Electronics, Vol. 3 No. 4, Oct. 1988, pp 399-405.
    • K. Oguchi, Y. Maki, Y. Sunaga, "Three-Phase Multilevel Voltage Source Converters with Low Switching Frequencies and Less-Distorted Input Voltages", IEEE Conference Proceedings IAS'93, 1993, pp 870-878.
    • [44] K. Oguchi, Y. MaId, Y. Sunaga, "Three-Phase Multilevel-Voltage Source Converters with Low Switching Frequencies and Less Distorted Input Voltages", IEEE Transactions on Industry Applications, Vo!. 30, No. 5, Sept.lOct. 1994, pp 1156-1165.
    • [45] F. Z. Peng, J.-S. Lai, J. McKeever, J. VanCoevering, "A Multilevel Voltage-Source Inverter with Separate DC Sources for Static Var Generation", IEEE Conference Proceedings IAS'95, 1995, pp 2541 -2548.
    • [46] F. Z. Peng, 1.-S. Lai, J. McKeever, J. VanCoevering, "A Multilevel Voltage-Source Converter System with Balanced DC Voltages", IEEE Conference Proceedings PESC'95, 1995, pp 1144-1150.
    • [59] 1. K. Steinke, "Switching Frequency Optimal PWM Control of a Three-Level Inverter" , IEEE Transactions on Power Electronics, Vol. 7, No. 3, July 1992, pp 487-496.
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