Development of high-performance control and parallel processor implementation for induction motor drives

Li, Wali (1992) Development of high-performance control and parallel processor implementation for induction motor drives. Masters thesis, Memorial University of Newfoundland.

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Abstract

Implementations of the most popular scheme of indirect field-oriented control for AC induction motor drives still suffer from difficulties due to the sensitivity of rotor parameters in decoupling torque and flux and control algorithm complexity in meeting real-time control requirements. -- This thesis presents solutions to some of these problems. A new parameter adaptation control scheme, named rotor flux orientation control, is proposed and verified by digital simulations which show a very good result in dynamically correcting the mismatched value in the slip frequency calculator that usually occur when temperature rises or flux saturates. This method is base on the principle of feedback control which uses the detected rotor flux orientation as a feedback control signal. -- For processing complex control algorithms in real-time, a new parallel processor architecture, using T800 Transputers, is proposed. Implementation results show that with this parallel processing controller complex control algorithms such as field-oriented control and parameter adaptive control together can be handled in very short processing times thus meeting fast dynamic control demands. -- In addition, the design of indirect field-oriented control of AC induction motor is studied. A design method for linear control of AC induction motor control based on the indirect field-oriented control scheme is proposed. Decoupling of torque current and flux current is achieved by applying feed-forward controllers. -- A new control scheme, named extended indirect field-oriented control, is proposed and verified by simulation results which show an excellent control performance that cannot be achieved by a linear control scheme. -- Furthermore the incorporation of fault tolerance for Transputer communication link failures and processor failures is studied and some simulation tests have been carried out. As a result of the fault tolerance mechanisms incorporated, control system reliability is improved.

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