电力系统保护与控制2024，Vol.52Issue(16)：120-131,12.DOI:10.19783/j.cnki.pspc.246017
基于长周期暂态信号分析的电机驱动变换器直流母线电容在线状态监测
Online monitoring of a DC-link capacitor for a motor drive converter based on long period transient signal analysis
摘要
Abstract
DC-link capacitors,as some of the most vulnerable components in motor drive inverters,are crucial for online monitoring for aging.Their deterioration increases the probability of system failure.However,existing monitoring methods suffer from issues such as poor economic efficiency,high sampling frequencies,and interference with normal system operation.Therefore,a capacitor online monitoring method based on long-period transient signal analysis is proposed.This is used to estimate the equivalent series capacitance(ESC)of DC-link capacitors in motor drive inverters.Initially,a common-node admittance-capacitance equivalent transient model is established based on the system load switching process,and the characteristics of long-period transient signals is analyzed.Subsequently,an online monitoring model based on such signals is derived,and the criteria for initiating the monitoring process are determined.Then a polynomial reconstruction-based capacitor current baseline calibration method is proposed to eliminate the influence of sensor drift and to enhance monitoring accuracy.Finally,simulation and experiments show that the monitoring accuracy of the proposed method meets the requirements of capacitance monitoring.关键词
电机驱动变换器/电容器老化/等值串联电容/在线监测/长周期暂态信号Key words
converters of motor driven/capacitor aging/equivalent series capacitance/online monitoring/long period transient signal引用本文复制引用
王要强,李锐,陈天锦,聂福全,赖锦木,梁军..基于长周期暂态信号分析的电机驱动变换器直流母线电容在线状态监测[J].电力系统保护与控制,2024,52(16):120-131,12.基金项目
This work is supported by the National Natural Science Foundation of China(No.52307148). 国家自然科学基金项目资助(52307148) （No.52307148）
中央引导地方科技发展资金项目资助(2022ZY0134) （2022ZY0134）
