A new overmodulation strategy for induction motor drive using space vector PWM

In the overmodulation region, the operation of the three phase induction motor with a current controller is characterized by a rapid deterioration of the motor torque and speed. It is desirable to use the overmodulation strategy that can extend the normal operating range even in this case. In this paper, a new overmodulation strategy is proposed for the high performance motor drive and a comparison study with two conventional strategies are also described. In the proposed strategy, considering the motor dynamics, a suitable voltage vector is selected in order to extend the stable operating range in the overmodulation region. With this advanced algorithm, the normal operating range can be extended without any extra hardware. From the experimental results, it is verified that the proposed strategy provided the improved performance over the conventional strategies