期刊
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
卷 55, 期 4, 页码 3770-3780出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIA.2019.2908342
关键词
Current limit; deadbeat-direct torque and flux control (DB-DTFC); field-oriented control (FOC); flux observer; flux weakening; self-sensing; voltage limit
资金
- Wisconsin Electric Machines and Power Electronics Consortium, University of Wisconsin-Madison
- Toshiba Mitsubishi-Electric Industrial Systems Corporation, Tokyo, Japan
Flux weakening techniques have been developed for field-oriented control (FOC) drives to achieve the maximum torque capability above the base speed. Deadbeat-direct torque and flux control (DB-DTFC) has the advantages of precise torque and flux control and reduced parameter sensitivity compared to FOC, thus it has the benefit of more consistently achieving the maximum torque capability in the flux weakening region more accurately. This paper introduces a flux weakening strategy for DB-DTFC. Considering voltage and current limits, a simple solution to the optimal trajectory for the stator flux magnitude is derived to achieve the maximum feasible torque over the entire operating range. Results show that the speed control is extended to a significantly higher range beyond the base speed. Torque control is less sensitive to machine parameters and has better dynamics in the flux weakening region compared with the traditional FOC drives. Self-sensing is also investigated in the flux weakening region. Challenges of self-sensing are addressed to significantly extend the high-speed operating range.
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