Deadbeat direct torque control for induction motor drives considering voltage limits of inverters

A novel deadbeat direct torque control (DB-DTC) technique for induction motor drives was proposed. Based on the discrete model of induction motors, the control law of the DB-DTC with space vector modulation was obtained by using the stator and rotor flux linkage as the state variables in the stator flux oriented synchronous reference frame. By employing a graphical analysis method, the physical meanings of the voltage vector solutions were explained clearly. And the implementation problems of DB-DTC were discussed in details under the output voltage limits of the voltage source inverter. The three available schemes of the optimal voltage solutions of DB-DTC for various operation points were presented and evaluated. On the basis of the theoretical analysis, the simulation and experimental tests were carried out. The simulation and experimental results show that the proposed method achieves the fast torque and flux response and the driving system possesses excellent control performance.