DC link and dynamic performance features of PWM IGBT current source converter induction machine drives with respect to industrial requirements

When rating the IGBT PWM current source induction machine drive in relation to industrial requirements, there are some important performance features to be studied. These are especially the dynamic control performance and the size and influence of the inductance in the DC link. These subjects and their interference are evaluated here, giving a basis for rating. With a high pulse frequency of the converters, with respect to the current ripple, only a low inductivity in the DC link is necessary, leading to low weight and volume and improving the ideal basic dynamic performance, too. A high dynamic performance, comparable to PWM voltage source induction machine drives, is reached when, beneath a DC link inductance with suitable low inductivity, selected control methods as field oriented control and, as chosen here, optimal state control, are applied. The basic performance is analysed and the the results are partially verified by measurements at a 7.5 kW test drive.