DB-DTFC for PMSM in the Stationary Reference Frame Using Reference Flux Vector Calculator

The direct torque and flux control scheme in the $\alpha - \beta$ reference frame (DTFC-AB) is easy to implement since the manipulated input in the $\alpha - \beta$ reference frame can be directly obtained by using a deadbeat stator flux controller. Generally, a PI controller is used for the torque control. The integrator in the PI controller causes windup problem and thus anti-windup method should be employed, which complicates the algorithm and deteriorates the system dynamic performance. To this end, a deadbeat torque controller is designed for the DTFC-AB (DBDTFC-AB) scheme. The digital stator flux observer and the digital stator current observer for the prediction are given in detail, and various experiments are conducted on a test bench based on the dSPACE MicroLabBox to validate the proposed DB-DTFC-AB scheme.