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| Optimal Tracking Control of Servo Motor Speed Based on Online Supplementary Q-Learning |
| Zou Xiaomin1, Xiao Xi1, He Qi2, Shkodyrev Vyacheslav3 |
1. Department of Electrical Engineering Tsinghua University Beijing 100084 China;
2. AVIC Shaanxi Aero Electric Co. Ltd Xi’an 710077 China;;
3. Peter the Great St. Petersburg Polytechnic University St. Petersburg 195251 Russia |
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Abstract This paper combined online Q-learning with supplementary control and discussed its application to the optimal tracking control problem of servo motor speed. Firstly, the problem to be solved was defined in the framework of linear quadratic tracking. Then, the iterative algorithm of policy evaluation and policy improvement for online supplementary Q-learning was given. In the simulation test, for the motor speed tracking problem in servo system, the traditional PI controller was firstly designed, and then the supplementary controller proposed in this paper was connected to it in parallel to form a new speed controller. The simulation results showed that the additional controller significantly improves the dynamic response characteristics of motor speed tracking, and has the adaptive ability to automatically adjust when parameters of the controlled system changes. When the nonlinear system can be locally linearized under certain conditions, the proposed method can also be applied to obtain better control performance.
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Received: 30 November 2017
Published: 21 March 2019
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2019, Vol. 34 
