Research on Parameter Design and Control Method for Current Source Inverter–Fed IM Drive Systems

In the current source inverter (CSI)-fed inductor motor (IM) drive system, DC-bus inductance and AC-filter capacitance have a direct impact on the dynamic response speed, power quality and power density. In addition, due to the addition of filter capacitors, the mathematical model formed by the IM and capacitor is a third-order system, which increases the difficulty of parameter tuning for the control loop. To solve the above problems in the CSI, a DC-bus inductance design method based on current response speed and the ripple of the DC-link current and an AC-filter capacitance design method based on current utilization and filtering characteristics are presented. Then, the analytical expressions between the open-loop cut-off frequency, phase margin and the PI controller parameters of the current loop and speed loop are derived. Finally, an experimental platform is established to validate the proposed method.