Microprocessor Implementation of a State Feedback Control Strategy for a Current Source Inverter-Fed Induction Motor Drive

The realization of a microprocessor-based controller which implements a complete state feedback control strategy for a current source inverter-fed induction motor drive is reported. The controller design is based on the application of the pole assignment technique of multivariable system regulation theory to a d-, q-axis state-space linearized model of the drive and includes a reduced-order observer to achieve fast regulation and stability. The observer is designed to reconstruct the inaccessible states such as d-, q-axis rotor currents from the knowledge of the system inputs and outputs. The hardware and software implementation of the controller around an inexpensive 8085-based microprocessor kit is discussed, and typical test results are presented, along with the digital simulation results, to show its performance.