Implementation of loss minimization control for high performance AC motor drives

Lu, Rong-shen (1993) Implementation of loss minimization control for high performance AC motor drives. Masters thesis, Memorial University of Newfoundland.

[English] PDF (Migrated (PDF/A Conversion) from original format: (application/pdf)) - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Download (14MB) [English] PDF - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. (Original Version)

Abstract

AC motors have been used in a wide range of power ratings to date and are playing a prominent role in drive applications. However, their highly non-linear dynamic structure with strong dynamic interactions requires more complex control schemes than dc motors. -- The conventional linear techniques can no longer satisfy the stringent requirement placed on high-performance ac motor drive applications. Modern control techniques, such as optimal control and adaptive control, are applied in motor drive systems. But the realization of these techniques is generally difficult because of large time-critical computation requirements. Typical field-oriented control of ac motors uses current loop sampling rates of 5 to 10 KHz. This implies that the controller must process the control algorithms within 100 to 200 μs. Thus, for high-performance ac drives, some powerful microcomputers, such as Transputers, and parallel processing techniques are used in ac motor drive systems. On the other hand, reducing the energy losses in adjustable-speed electric motor drives is becoming increasingly important due to the high cost of energy. -- Transputer-based parallel processing of high performance ac motor drives can be a good solution for fast dynamic calculation, flexible architecture and interactive control in order to achieve both requirements of high performance and loss minimization of ac motor drives. -- The purpose of this study is to investigate and apply multiple Transputers in parallel processing of indirect field-oriented vector control employing loss minimization for high performance ac motor drives. A new scheme is proposed based on the use of multiple Transputers for real-time parallel processing implementation of the indirect field-oriented control scheme incorporating the loss minimization strategy. Losses in ac motor drives are studied and verified by experiments. Computer simulation results of trials using five Transputers and experimental results of using four Transputers for parallel processing are presented in the thesis. It is shown that high performance as well as significant energy savings for ac motor drives can be achieved by the proposed scheme.

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