【目的】永磁同步电机(PMSM)驱动系统输出端常接LC滤波器用于消除高频电压脉冲。然而加入LC输出滤波器后易引起固有谐振,导致控制系统不稳定。为了解决带LC输出滤波器PMSM的谐振抑制问题,本文提出了一种基于电容电流有源阻尼的谐振抑制策略。【方法】首先建立了带LC输出滤波器的PMSM控制系统数学模型,通过分析控制系统传递函数和伯德图定位了谐振产生的原因。然后设计了一种基于电容电流有源阻尼的控制方法,并从频域的角度分析并确认了该方法的有效性,并针对所提控制方法开展了电流环控制器参数设计。为验证所提方法的有效性,将其和传统的矢量控制方法及无源阻尼控制方法进行了对比。【结果】本文所提控制策略,相比传统矢量控制方法超调小、响应快,稳定性更优;相比无源阻尼方法,在不增加硬件的情况下解决了控制电路谐振问题,在负载突变时表现出优秀的抗干扰能力。【结论】研究表明,针对带LC输出滤波器的PMSM控制系统,本文提出的电容电流有源阻尼策略可实现对电机转速的平稳控制并解决了该控制系统谐振问题。

Abstract: [Objective] The output terminal of the permanent magnet synchronous motor (PMSM) drive system is often connected to an LC filter, which is used to eliminate high-frequency voltage pulse. However, the introduction of an LC output filter can induce inherent resonance, leading to instability in the PMSM control system. In order to suppress the resonant caused by LC output filter in permanent magnet synchronous motors drive system, a resonance suppression strategy based on active damping via capacitor current feedback is proposed at the paper. [Methods] Firstly, a mathematical model of the PMSM control system with LC output filter was established. Meanwhile, the causes of resonance were analyzed and located by analyzing the transfer function and Bode diagram of the control system. Then, a control method based on active damping of capacitive current was designed. The effectiveness of the method was analyzed and confirmed by the frequency domain perspective. Subsequently, in order to ensure the stability of the control system, the parameter design of the current regulator and the design of the active damping coefficient was carried out. To verify the effectiveness of the proposed method, it was compared with traditional vector control methods and passive damping control methods. [Results] Compared with traditional vector control methods, the capacitor current active damping control strategy proposed in this paper has a small overshoot and response time, which exhibited better stability. Compared with passive damping control methods, the proposed strategy achieved a good solution to the resonance problem of the control circuit without increasing hardware, which showed good anti-interference ability in the case of sudden load loading and unloading.[Conclusion] The above work indicates that, for PMSM control systems with LC output filters, the capacitor current active damping method proposed in this paper can achieve smooth control of motor speed and effectively solve the problem of control system resonance.

国家自然科学基金(U2267206);中国国家原子能机构稳定支持项目(WDZC-2023-05-03-04)