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The principle and the results of an experimental study concerning a new high power inverter drive system will be presented. One usual method of supplying large vector-controlled AC drives is by three-level inverters configured with 6-inch, 6 kV, 6 kA GTOs. These inverters can be adopted for drives that have ratings less than several thousands kW. However, in the case of drives rated more than several thousands kW, two inverters have been combined using inter-phase reactors. But inter-phase reactors have problems of acoustic noise and high losses, and in addition, are bulky and expensive. To overcome these problems, a new configuration using a wound-rotor induction motor and two current controlled PWM inverters, is proposed. In this configuration, the outputs of the two inverters are combined electro-mechanically in the machine, and as a result, novel features can be obtained.
Date of Conference: 1-3 Dec. 1998