Thesis (M.Sc.) - Cairo University - Faculty of Engineering - Department of Electrical Power and Machines

DTC of AC drives is considered one of the most important high performance control techniques nowadays. PMSMs are now replacing IMs in wide applications due to their high efficiency and compact size. DTC offers high dynamic responses for torque and flux better than that of FOC with simple control architecture and less parameter sensitivity. Comparisons between DTC and FOC are made via simulations to verify the high dynamics of DTC over FOC. Flux estimation techniques, various switching tables, and the effect of varying the hysteresis bands are studied via simulations to compare between them and show their effects on the drive performance. Torque/Flux ripples and variable switching frequency problems can be solved using SVM, Duty Ratio Control, or model predictive control but complexity will be increased so trade off studies should be done to select the most suitable method according to the used application. The complete description of the experimental DTC-PMSM system is discussed. DSP programming using CACSD is discussed and experimental implementation of six step operation as well as open loop V/F control of PMSM are made and the results are presented and discussed

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