An Improved Digital One-Cycle Control Algorithm for Switching Power Amplifier in Magnetic Bearings
Li Shiwen1, Deng Zhiquan1, Cao Xin1, Liu Chengzi2, Li Kexiang1
1. College of Automation Nanjing University of Aeronautics and Astronautic Nanjing 211106 China; 2. College of Automation Nanjing University of Posts and Telecommunications Nanjing 210023 China
Abstract：An improved digital one-cycle control algorithm for switching power amplifier in magnetic bearings is proposed. Digital one-cycle control has the advantages of simple structure, easy realization and rapid response. However, the traditional one-cycle algorithm has some problems such as unbalanced switching frequency, obvious distortion of current amplitude, and some switching cycles cannot achieve tracking targets. In this paper, nine switching states of single-phase full-bridge circuit were analyzed, and the switching logic was optimized. The principle of one-cycle control was analyzed with the consideration of resistance voltage drop, and the judgment criterion of charge and discharge period is optimized for more precise control. Simulation and experiments were carried out. The results show that the actual current can accurately track the given current under the control of the improved one-cycle algorithm, which proves the feasibility of the algorithm. The proposed algorithm can realize the switching frequency equalization of four switches, and has smaller distortion of actual current and higher control accuracy.
李诗文, 邓智泉, 曹鑫, 刘程子, 李克翔. 一种改进的磁悬浮轴承开关功率放大器数字单周期控制[J]. 电工技术学报, 2020, 35(2): 274-283.
Li Shiwen, Deng Zhiquan, Cao Xin, Liu Chengzi, Li Kexiang. An Improved Digital One-Cycle Control Algorithm for Switching Power Amplifier in Magnetic Bearings. Transactions of China Electrotechnical Society, 2020, 35(2): 274-283.
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2020, Vol. 35 
