永磁同步电机矢量控制系统扩展频域模型及其在谐振抑制中的应用

Extended spectral-domain model of permanent magnet synchronous motor vector control system and its application in resonance suppression

原矢量控制系统频域模型在直接用于高速、带载系统运行性能分析时存在较大的误差,对其构建理论及过程进行了重新分析。在指出误差产生根源的基础上,通过在系统数学模型中引入反电势和负载的作用,并削弱直轴电流对系统误差的影响,从而提出可以直接用于永磁同步电机矢量控制系统性能分析的扩展频域模型。此外,还研究了扩展频域模型在系统谐振抑制中的应用技术,给出了基于解析方法的系统谐振抑制前后的带宽以及谐振点与反谐振点的计算结果。通过验证,进一步利用超前校正网络技术,对抑制后的带宽进行恢复和扩展。研究表明:该扩展模型不仅性能分析误差小,而且可以用解析法直接获取系统的频率响应特性,克服了原模型在获取高速、带载条件下系统频率响应特性时依赖扫频试验方法的局限性。

Addressing at the problem that the spectral-domain model of the original vector control system has a significant error when directly employed for the performance analysis of high-speed and on-load system,the construction theory and process are reanalyzed.By identifying the root cause of the error,an extended spectral-domain model is proposed that can be directly used for the performance analysis of the permanent magnet synchronous motor vector control system.This is achieved by incorporating the role of back electromotive force and load into the system’s mathematical model and weakening the influence of the direct axis current on the system error.In addition,the application technology of the extended spectral-domain model in the system resonance suppression is also studied.The bandwidth before and after the system resonance suppression based on the analytical method and the calculation results of the resonance point and the anti-resonance point are given.Based on passing verification,the advanced correction network technology is further used to restore and expand the suppressed bandwidth.The research shows that the extended model not only has small error in performance analysis,but also can directly obtain the frequency response characteristics of the system by analytical method,which overcomes the limitations that the spectral-domain model of the original vector control system needs to use the frequency sweep experiment method to obtain the frequency response characteristics of the system under high speed and load.