Abstract：For many years, the instability problem of the induction motor speed sensorless vector control system in the low synchronous speed range has not been solved. It results from the unobservable system state variables, the unstable pole distribution and the poor robustness of the motor parameters. If and only if the three problems are solved simultaneously, the instability problem in the low synchronous speed range can be solved. In this paper, a virtual voltage injection method is adopted based on the classical closed-loop flux observer to improve its stability in the low speed range. Different from the traditional high frequency/low frequency signal injection method, the virtual voltage is injected into the observer rather than the motor. It can solve the observability of the system state variables, the stability of the pole distribution and the robustness of the motor parameters at the same time. Finally, the stable operation of the system can be achieved in the low synchronous speed range.
王震宇, 孙伟, 蒋栋. 基于虚拟电压注入的闭环磁链观测器的感应电机无速度传感器矢量控制系统[J]. 电工技术学报, 2022, 37(2): 332-343.
Wang Zhenyu, Sun Wei, Jiang Dong. Induction Motor Speed Sensorless Vector Control System Based on Closed-Loop Flux Observer with Virtual Voltage Injection. Transactions of China Electrotechnical Society, 2022, 37(2): 332-343.
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