感应电机低采样频率的磁链观测器离散化模型研究

doi:10.19595/j.cnki.1000-6753.tces.180416

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Abstract Aiming at the limitations of themodelof the Full-order observer using first-order Euler withfull speed range, that is, the discretizationmodel is unstable when operating at high speed, an improved discrete observer model based on different reference frame is proposed. The model is based on the rotor equation in the rotor reference frame,with the stator equation in the stationary reference frame.Considering the stator flux and rotor flux as the state variable, a discretized state matrix is used to convert the equations by designing the feedback matrix for pole placement, thus the stable observation of flux can be realized. The stability of theimproved discrete observation model can be proved by the stability theory of discrete domain. The root locus plot of the model is in the stable region to achievestability within the whole-speed range. Finally, both the simulation and experiment results demonstrate thecorrectnessandeffectivenessof theproposedmethod.

Key words： Induction motor flux observer low sampling frequency model discretization poles

Received: 27 March 2018 Published: 13 August 2019

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TM343

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	Li Jie
	Zhan Rong
	Song Wenxiang

Cite this article:

Li Jie,Zhan Rong,Song Wenxiang. Improved Discrete Observer Model of Induction Motor at Low Sampling Frequency[J]. Transactions of China Electrotechnical Society, 2019, 34(15): 3136-3146.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.180416 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/I15/3136

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