一种改进的磁悬浮轴承开关功率放大器数字单周期控制

doi:10.19595/j.cnki.1000-6753.tces.181580

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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.

Key words： Magnetic bearings switching power amplifier digital one-cycle control current control

Received: 28 September 2018 Published: 17 January 2020

PACS:

TN722.7

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	Li Shiwen
	Deng Zhiquan
	Cao Xin
	Liu Chengzi
	Li Kexiang

Cite this article:

Li Shiwen,Deng Zhiquan,Cao Xin等. An Improved Digital One-Cycle Control Algorithm for Switching Power Amplifier in Magnetic Bearings[J]. Transactions of China Electrotechnical Society, 2020, 35(2): 274-283.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.181580 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I2/274

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