Current space vector control of doubly fed twin stator induction machine drive

The doubly fed twin stator induction machine (DFTSIM) is of interest as a variable speed drive, as it combines the advantages of a brushless drive with the potential for high voltage, high power, and limited speed range applications. This study presents the simulated and the test results of a laboratory DFTSIM drive using a `current space vector control´ scheme. Whilst the magnitude of the control winding current space vector is dynamically controlled to obtain the desired torque in a speed control loop, its position is regulated to operate the machine in synchronous mode. The results indicate good dynamic and steady state performance of the drive. While the reduction in the converter VA rating with the DFTSIM drive is similar to that achievable with a slip power recovery drive, the brushless DFTSIM drive has a greater potential for applications requiring high reliability and low maintenance