中国电机工程学报2024，Vol.44Issue(4)：1608-1617,中插30,11.DOI:10.13334/j.0258-8013.pcsee.222349
基于差模开关振荡的变频电机绕组相端绝缘状态特征提取与解耦
Feature Extraction and Decoupling of Line-end Coil Insulation for Inverter-fed Machine Using High-frequency Differential Mode Switching Oscillation
摘要
Abstract
The line-end coil insulation of inverter-fed machine is more prone to deteriorate due to the high-frequency(HF)pulse width modulation(PWM)switching transient overvoltage.The switching oscillation resonance effect has the potential to sensitively indicate the small insulation state change.However,the condition features are HF coupled by multi-factors.To address the problem,this paper proposes a novel feature extraction and decoupling method of line-end coil insulation using the high-frequency differential-mode(HFDM)switching oscillation.First,the multi-modal switching oscillation in the inverter-fed machine system is analyzed and the HFDM is selected as the sensitive mode to exclude the influence of distributed capacitance of inverter side power devices.Then,the variational mode decomposition(VMD)algorithm is employed to extract the HFDM frequency from multi-modal switching oscillation,and the effect of the dynamic switching time of power devices under different transient operating conditions is decoupled.Finally,the amplitude ratio of HFDM current between the inverter side and machine side is utilized to decouple the influence of cable HF parameters.Experimental study on a 380V/3kW permanent magnet motor drive system is conducted to verify the effectiveness.The results show that the proposed method can sensitively indicate the health state of line-end coil insulation.Moreover,the effects of an inverter,cable and operating conditions can be effectively decoupled.关键词
变频电机/绕组绝缘/开关振荡/特征提取/解耦Key words
inverter-fed machine/line-end coil insulation/switching oscillation/feature extraction/decoupling分类
信息技术与安全科学引用本文复制引用
李豪,刘静宇,向大为,顾奕..基于差模开关振荡的变频电机绕组相端绝缘状态特征提取与解耦[J].中国电机工程学报,2024,44(4):1608-1617,中插30,11.基金项目
国家自然科学基金项目(52177190,51907116) （52177190,51907116）
上海市自然科学基金项目(22ZR1425400). Project Supported by National Natural Science Foundation of China(52177190,51907116) （22ZR1425400）
The Natural Science Foundation of Shanghai(22ZR1425400). （22ZR1425400）
