带LC滤波器的高速永磁同步电机的滤波器主动阻尼方法比较评估和控制器参数设计OA

The small stator inductance of a high-speed permanent magnet synchronous motor(PMSM)results in significant phase current ripple due to pulse width modulation(PWM).Installing an LC filter at the inverter output can effectively suppress this adverse effect,forming an LC-filtered PMSM drive system(LC-PMSM).However,the LC filter and stator inductance can cause LCL resonance,which significantly affects system stability.Active damping is necessary to suppress resonance and stabilize the system. The filter-based active damping method is widely used due to its simple structure and ease of parameter design.However,there is a lack of criteria for selecting,evaluating,and designing active damping filters.This paper proposes a general graphical method to assess the resonance-suppression performance of active damping filters for inverter-side current feedback in LC-PMSM systems.The robustness to resonance-frequency drift and the stability regions of the traditional notch filter(NF),low-pass filter(LPF),delay filter(DF),and all-pass filter(APF)are compared.Thus,the influence of filter-based active damping on system resonance phenomena is revealed.APF has the widest stability region and does not alter the system's amplitude-frequency characteristics,making it the most suitable for inverter-side current feedback control.Accordingly,this paper proposes a resonance suppression method by reshaping the phase-frequency characteristic.Furthermore,using a discrete-domain transfer function model and stability margin indices,a detailed parameter design approach for the APF is presented. Simulations and experiments were conducted.Simulation results show that compared with NF,LPF,and DF active damping,the proposed APF active damping method maintains stability across the whole speed range under parameter variations.Experimental results show that the proposed APF active damping method maintains stability under large-scale speed variations.It exhibits better harmonic current suppression at the resonant frequency than existing filter-based active damping methods,with lower total harmonic distortion(THD)and lower current ripple.Multi-parameter robustness analysis shows that the unstable system rapidly stabilizes after APF active damping and remains stable across the speed range when multiple LC-PMSM parameters are simultaneously varied.The tolerating individual deviations are±50%in motor inductance and±20%in LC filter parameters.Moreover,it can simultaneously accommodate combined variations of±15%in LC filter parameters and(-30%to+50%)in motor inductance parameters. The following conclusions can be drawn.(1)For inverter side current feedback,the proposed general graphical method effectively evaluates the robustness to resonance frequency drift and stability regions of different active damping filters.(2)The proposed resonance suppression method based on APF phase-frequency characteristic reshaping requires no additional sensors and effectively suppresses LCL resonance by adjusting the APF parameters only.(3)At the whole speed range,the proposed method exhibits good parameter robustness,tolerating simultaneous variations in multiple system parameters.