New medium voltage PWM inverter topologies for adjustable speed AC motor drive systems

In this paper new PWM voltage source inverter topologies suitable for adjustable speed operation of medium voltage (690 V, 2300 V, 3300 V, 4160 V) induction motor drives are introduced. The new inverter topologies are derived from an optimum combination of several three phase and single phase PWM inverter modules. These modules employ low voltage high current IGBT devices and can be viewed as power electronic building blocks (PEBBs). The proposed medium voltage inverters exhibit high quality PWM output with low dv/dt, modular construction with built-in redundancy, lower DC-link capacitive energy storage compared to other structures and are flexible for different medium voltage ASD applications. A method to eliminate bulky input transformers is shown. Issues of input current quality are also addressed. Simulation results are presented to validate the concepts.

[1]  Chanan Singh,et al.  Reliability analysis of electric supply including standby generators and uninterruptible power supply system , 1993, Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting.

[2]  P. W. Hammond.  A new approach to enhance power quality for medium voltage drives , 1995, Industry Applications Society 42nd Annual Petroleum and Chemical Industry Conference.

[3]  Shirish P. Mehta,et al.  Transforming transformers ~superconducting windings\ , 1997 .

[4]  P.K. Steimer,et al.  IGCT-a new emerging technology for high power, low cost inverters , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.