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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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

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TM351

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	Zheng Changming
	Dong Xuanxuan
	Xiao Ziyu
	Yang Jiafeng
	Gong Zheng

Cite this article:

Zheng Changming,Dong Xuanxuan,Xiao Ziyu等. Virtual Resistance Active Damping based Predictive Current Control of LC-Filtered Permanent Magnet Synchronous Motor System[J]. Transactions of China Electrotechnical Society, 0, (): 239622-239622.

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