On continuous control of PWM inverters in the overmodulation range including the six-step mode

The power output and the dynamic performance of pulse width modulation (PWM)-controlled AC motor drives can be improved by increasing the inverter output voltage through overmodulation. Two different solutions are proposed to increase the output voltage in a continuously controllable fashion up to the maximum possible value, which is reached in the six-step mode. The solutions differ in their approach. A space vector strategy is used for high dynamics performance high switching frequency drives, while a field-oriented PWM method is used for low switching frequency high power inverters. The methods are described and analyzed, and experimental results are presented.<<ETX>>

[1]  Toshihiko Noguchi,et al.  A New Quick-Response and High-Efficiency Control Strategy of an Induction Motor , 1986, IEEE Transactions on Industry Applications.

[2]  Joachim Holtz,et al.  Optimal pulsewidth modulation for AC servos and low-cost industrial drives , 1992, Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting.

[3]  Hirofumi Akagi,et al.  A Novel Control Scheme for Current-Controlled PWM Inverters , 1986, IEEE Transactions on Industry Applications.

[4]  Joachim Holtz,et al.  High-Speed Drive System with Ultrasonic MOSFET PWM Inverter and Single-Chip Microprocessor Control , 1987, IEEE Transactions on Industry Applications.

[5]  X. Xu,et al.  Bus utilization of discrete CRPWM inverters for field oriented drives , 1989, Conference Record of the IEEE Industry Applications Society Annual Meeting,.

[6]  Joachim Holtz,et al.  Field-Oriented Control by Forced Motor Currents in a Voltage Fed Inverter Drive , 1983 .

[7]  T.G. Habetler,et al.  Performance characterization of a new discrete pulse modulated current regulator , 1988, Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting.

[8]  J. Holtz,et al.  Field-oriented asynchronous pulsewidth modulation for high performance AC machine drives operating at low switching frequency , 1988, Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting.

[9]  Joachim Holtz.  Pulsewidth modulation-a survey , 1992, IEEE Trans. Ind. Electron..