Complex Vector Synchronous Frame PI Current Regulator Development in Discrete-time Domain

Abstract

In this thesis, mathematical model for synchronous machines is developed in stationary and synchronous reference frame. Two type of vector controllers named synchronous frame PI current regulator with cross-coupling decoupling and complex vector synchronous frame PI current regulator are developed in discrete-time domain. Tuning of current controllers is also detailed in continuous as well as discrete-time domain. It is shown that complex vector type controller shows better performance and it is less sensitive to electrical parameter variation. Speed estimation algorithms are also studied which use incremental encoder output directly or indirectly. Comparative study regarding pulse width modulation strategies, is also made. It is also discussed how motor electrical parameters can be determined, if not available. A high voltage digital motor control and power factor correction kit by Texas Instruments is used as part of experimental setup. PSIM provided tool, SimCoder, is used to program the controller.