期刊
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
卷 10, 期 2, 页码 1963-1977出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JESTPE.2021.3050805
关键词
Phase locked loops; Frequency estimation; Frequency locked loops; Synchronization; Rotors; Power electronics; Estimation error; Closed-loop flux observer; induction motor drives; open-loop synchronization (OLS); speed estimation scheme
资金
- High-Speed Railway Joint Funds of the National Natural Science Foundation of China [U1934204]
This article proposes an open-loop synchronization method for speed-sensorless control of induction motor drives. The proposed method estimates the speed using sinusoidal signals and their time-delay signals, and employs a closed-loop flux observer to handle disturbance from dc offsets. Compared to other methods, this approach can maintain system dynamics and stability margin.
Speed estimation schemes based on the closed-loop synchronization (CLS) methods for speed-sensorless control of motor drives attract much popularity due to several advantages, for example, easy implementation, high flexibility, and acceptable performance. However, most of the existing CLS-based estimation schemes may suffer from performance degradation during frequency ramps. Considering this, an attempt of the type-3 phase-locked loop (PLL)-based scheme is made. This solution, however, may adversely affect the system dynamics and stability margin. To address these issues, an open-loop synchronization (OLS) method is proposed for speed-sensorless control of induction motor drives in this article. In the proposed scheme, the estimated speed is obtained according to the sinusoidal signals and their time-delay signals, rather than increasing the system order. With this, system dynamics and stability margin are maintained. In practice, the disturbance of dc offsets is of concern in induction motor drives. Thus, a closed-loop flux observer is adopted to guarantee the estimation performance under dc offsets. The performance of the proposed OLS scheme is investigated and compared with that of the CLS schemes and the type-3 PLL scheme through experimental tests.
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