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.
赵雷廷, 刁利军, 董侃, 刘志刚. 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[J]. 电工技术学报, 2013, 28(10): 103-112.
Zhao Leiting, Diao Lijun, Dong Kan, Liu Zhigang. A Novel Discretized Closed-Loop Full-Order Rotor Flux Observer for Induction Motor Based on Re-Organization of State Space. Transactions of China Electrotechnical Society, 2013, 28(10): 103-112.
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