Research On The Control Technique Of The Auxiliary Inverter For Subway Vehicle

Unlike inverters for general purpose,auxiliary inverters of subway vehicle have the characters of high power,wide range of high DC input voltage,entirely sealed electronic units and natural cooling. Single pulse width modulation (PWM) technology is found to be optimal by comparing several different high power inverter technologies and is utilized in the 2-channel staircase inverter discussed in this thesis. The feasibility of the scheme as well as the digital control system is validated on a small power prototype.Furthermore,the method of improving the quality of output voltage and increasing the utilization ratio of the DC input voltage through adding channels is analyzed and experimentally verified. At last,optimal design methodology of the multi-channel PWM staircase inverter is shown.