基于虚拟电阻有源阻尼的LC滤波型永磁同步电机系统预测电流控制

doi:10.19595/j.cnki.1000-6753.tces.230582

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摘要

LC滤波型永磁同步电机驱动系统（LC-PMSM）因具有固有谐振峰而易引起电流环谐振失稳问题。且LC滤波器增大了系统阶数,导致常规线性控制方法结构和参数整定复杂。为解决上述问题,本文提出了一种基于虚拟电阻有源阻尼的无差拍预测电流控制策略。考虑到逆变器侧电感电流可由控制器直接控制,首先设计了一种结构简单的电感电流无差拍预测控制器,其能够实现对定子电流的间接矢量控制。其次,为了抑制系统固有谐振,进一步提出了一种基于滤波电容并联虚拟电阻的有源阻尼控制策略。最后,给出了系统的闭环稳定性分析及参数设计准则,并通过实验验证了所提控制方法的有效性。

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关键词 ：永磁同步电机, LC滤波器, 预测控制, 虚拟电阻, 有源阻尼

Abstract：

To achieve efficient and reliable production and transportation for underground coal mine applications, permanent magnet synchronous motors (PMSMs) are usually placed underground and inverters are deployed above the mine, connected by long power cables. However, long power cable will aggravate motor overvoltage, bearing damage and insulation aging. Therefore, it is necessary to install LC filters on the output side of the inverter to form an LC-filtered PMSM drive system (LC-PMSM). However, due to the inherent resonance peak of the system, it is easy to cause the resonance instability of the current loop. Moreover, the LC filter increases the system order, which makes the structure and parameter tuning of the conventional linear control method complicated. To solve the above problems, this paper proposes a deadbeat predictive current control strategy based on virtual resistance active damping.
Firstly, a deadbeat predictive controller of inductor current with a simple structure is designed to realize the indirect control of motor stator current. Then, in order to suppress the instability of the current loop caused by the inherent resonance of the LC-PMSM system, based on the deadbeat predictive control, an active damping control strategy based on the filter capacitor parallel virtual resistance is designed to ensure the system stability. Finally, the discrete closed-loop transfer function of the current loop of the proposed predictive current control method is constructed and the LC filter parameters are designed. The stability of the system is also theoretically analyzed.
Experiments were carried out based on the LC-PMSM system. The experimental results show that under the rated load condition, when conventional deadbeat predictive current control is used, the stator current have significant resonance oscillations under different speed values. In contrast, the proposed control strategy does not cause significant resonance instability, and the stator current distortion rate is maintained at a desired level. In addition, the stator current harmonics of the proposed control strategy are concentrated near the switching frequency and its integer multiples, which achieves a fixed switching frequency and facilitates the design of the output LC filter. The dynamic response experiment shows that the proposed method cause no resonance phenomenon during the PMSM starting process, and the speed can quickly reach its reference value. Also, when the system suddenly unloads the rated load to the no-load condition, the speed fluctuation is small and can quickly return to its reference using the proposed method.
The following conclusions can be drawn through the experimental analysis: 1) The proposed deadbeat predictive current control strategy based on virtual resistance active damping can effectively suppress the system resonance and ensure the stability of the system. 2) The proposed control strategy also has good dynamic performance in following the reference speed and resisting load disturbance. 3) The theoretical stability analysis of the system is given and verified.

Key words： Permanent magnet synchronous motor LC filter predictive control virtual resistance active damping

PACS:

TM351

基金资助:

国家自然科学基金面上项目（52277205）,国家自然科学基金青年科学基金项目（51907196,52107217）资助

通讯作者: 公铮男,1990年生,副教授,博士生导师,研究方向为大容量功率变换拓扑及控制与柔性直流输配电系统控制及保护。E-mail：zgo@cumt.edu.cn

作者简介: 郑长明男,1991年生,讲师,硕士生导师,研究方向为永磁同步电机驱动控制与新能源发电系统。E-mail：jsxzzcm@126.com

引用本文:

郑长明, 董萱萱, 肖子语, 阳佳峰, 公铮. 基于虚拟电阻有源阻尼的LC滤波型永磁同步电机系统预测电流控制[J]. 电工技术学报, 0, (): 239622-239622. Zheng Changming, Dong Xuanxuan, Xiao Ziyu, Yang Jiafeng, Gong Zheng. Virtual Resistance Active Damping based Predictive Current Control of LC-Filtered Permanent Magnet Synchronous Motor System. Transactions of China Electrotechnical Society, 0, (): 239622-239622.

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