1. College of Electronics and Information Jiangsu University of Science and Technology Zhenjiang 212000 China; 2. State Grid Shandong Electric Power Company Ji’nan 255001 China; 3. College of Mechatronic Engineering and Automation Shanghai University Shanghai 200072 China
Abstract：Since traditional sliding mode observer has inherent chattering problem, a discrete variable gain super-twisting sliding mode observer for permanent magnet synchronous motor is proposed. Firstly, the variable gain of the observer is dynamically adjusted with the motor speed and the internal state of system, so that the sliding mode chattering suppression in a wide range of variable speed conditions is achieved. Secondly, a first-order low-pass filter is designed to improve the robustness in the transient process of the sliding mode control system, and the convergence of sliding mode trajectory in finite time is proved based on reduction to absurdity. Finally, a new vector control strategy is proposed to fully decouple the d、q axis of current loop. Based on hybrid orientation, the effective back EMF component of α、β axis is extracted from the observer output, and combine with the back EMF transformation matrix, feedforward compensation in the current loop is realized. Experimental results verify the effectiveness and practicability of the control strategy proposed in this paper.
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2018, Vol. 33 
