Novel sensorless direct power and torque control of space vector modulated ac/dc/ac converter

A novel control strategy for PWM rectifier-inverter system is proposed. Fast controls strategies such as line voltage sensorless virtual flux (VF) based direct power-control with space vector modulator (DPC-SVM) for rectifier and direct torque control with space vector modulator (DTC-SVM) for inverter side are used. These strategies lead to good dynamic and static behaviour of the proposed control system- direct power and torque control- space vector modulated (DPT-SVM). The results obtained in simulations and experiment show good performance of the proposed system. Additional power loop from motor to PWM rectifier side improved dynamic behaviors of the power flow control. As result, better input-output energy matching allows decreasing the size of the dc-link capacitor.