New Control Strategy for Reducing Switching Losses in Three-Phase Voltage-Source PWM Converters

다국어 초록 (Multilingual Abstract)

In this paper, a new control strategy to reduce switching losses in three-phase voltage-source PWM converters is proposed according to Modified-Period-Average-Model (MPAM). The basic concept of this strategy is aimed at calculating the phase control voltages for controlling the source currents to be sinusoidal and in phase with the source voltages, and reducing the number of switching in each period.<br/>
The phase control voltages of Period-Average-Model(PAM) is obtained according to analyzing the operation of PWM converter In order to reduce the sensitivity to system parameters in PAM, MPAM is deduced Then a square wave whose frequency is three times of utility frequency is added to the phase control voltages derived from MPAM The control strategy reduces the switching losses since there exists about one-third blanking time for every phase in one period. The theoretical derivation and the control strategy are experimentally verified on a 2.5 kW three-phase voltage source converter.

목차 (Table of Contents)

• ABSTRACT
  
• 1.INTRODUCTION
  
• 2.MPAM FOR THREE PHASE PWM CONVERTER
  
• 3.ANALYSIS OF THE MPAM
  
• 4.DYNAMIC RESPONSE ANALYSIS
  
• 5.IMPROVED CURRENT CONTROL STRATEGY WITH REDUCED SWITCHING LOSSES
  
• 6.EXPERIMENTAL RESULTS
  
• 7.CONCLUSION
  
• REFERENCES