基于状态空间拆分重组的牵引异步电机闭环离散全阶转子磁链观测器

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Abstract The flux observer with 1st-order forward Euler discretization approach shows large discretization error and divergent result, under the low switching-frequency range of traction converter. This paper presents a novel discretized closed-loop full-order rotor flux observer, which is based on the re-organization of state space and models according to the asynchronous motor itself. In the observer, the coefficient array is constructed between a dynamic coefficient array, which is related to synchronous frequency and slip frequency array, and a constant coefficient array, which is merely derived out of the motor parameters. The coefficient array is then applied into the re-organization of state space. With locally accurate discretization approach, a novel discretized observer is derived, whose output is stator current, taking the error between actual and observed currents as a value for feedback compensation. By designing carefully the feedback compensation array, an accurate observation of the rotor flux is achieved. Simulated and experimental results testify the validity of the approach and model proposed, which shows excellent stability through the overall velocity range, with less discretized observation error and higher convergence rate.

Key words： Full-order rotor flux observer discretization error dynamic coefficient matrix constant coefficient matrix feedback compensation matrix

Received: 01 May 2013 Published: 25 March 2014

PACS:

U213.8

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	Articles by authors
	Zhao Leiting
	Diao Lijun
	Dong Kan
	Liu Zhigang

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Zhao Leiting,Diao Lijun,Dong Kan等. A Novel Discretized Closed-Loop Full-Order Rotor Flux Observer for Induction Motor Based on Re-Organization of State Space[J]. Transactions of China Electrotechnical Society, 2013, 28(10): 103-112.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2013/V28/I10/103

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