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| Virtual Resistance Active Damping Based Predictive Current Control of LC-Filtered Permanent Magnet Synchronous Motor System |
| Zheng Changming, Dong Xuanxuan, Xiao Ziyu, Yang Jiafeng, Gong Zheng |
| School of Electrical Engineering China University of Mining and Technology Xuzhou 221116 China |
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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 cables 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, complicating the structure and parameter tuning of the conventional linear control method. Therefore, 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, 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 according to the filter capacitor parallel virtual resistance is designed to ensure the system stability. Finally, the discrete closed-loop transfer function of the current loop 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 when conventional deadbeat predictive current control is used under the rated load condition, the stator current has 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 the 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 causes no resonance phenomenon during the PMSM starting process, and the speed can quickly reach its reference value. Also, when the system suddenly transitions from a rated load to a 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.
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Received: 01 May 2023
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2023, Vol. 38 
