基于开关函数模型的逆变器开路故障诊断方法  

Diagnosis Method for Inverter Open-circuit Fault Based on Switching Function Model

作　　者：安群涛[1] 孙力[1] 赵克[1] 刘超[1] 于丽娜[1] 

机构地区：[1]哈尔滨工业大学电气工程系,黑龙江省哈尔滨市150001

出　　处：《中国电机工程学报》2010年第6期1-6,共6页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50477009);黑龙江省自然科学基金项目(E200625)~~

摘　　要：逆变器的安全性和可靠性直接关系到电机驱动系统的正常运行。在研究逆变器在正常和故障状态下开关函数模型的基础上,提出一种功率管开路故障快速简易诊断方法。该方法根据故障和正常态器件承受电压的不同,采用简单的硬件电路来诊断和定位器件的开路故障。为保障诊断的有效性和可靠性,提出采用开关信号上升沿延时的方法来避免因IGBT开通和关断延迟造成的误诊断,并给出延时时间的确定方法。在搭建的感应电机变频调速(variable voltage and variable frequency,VVVF)控制和永磁同步电动机矢量控制系统中进行实验验证,实验结果表明,所提故障诊断方法能有效诊断逆变器单管和桥臂的开路故障。The normal operations of motor drive systems are directly related to the safety and reliability of inverters. Based on the analysis of switching function model for inverter under both normal and fault statuses,a novel simplified rapid diagnosis approach for component failures was proposed in this paper. Due to the different voltages endured by an IGBT under normal and fault modes,the simple hardware circuit was adopted to detect and locate open-circuit faults. To ensure effectiveness and reliability of the proposed diagnosis method,the raise edges＇ delays of switching signals were used to avoid false diagnosis,and the delay durations were determined considering various factors. The presented diagnosis approach was validated by induction motor variable voltage and variable frequency （VVVF） control system as well as permanent magnet synchronous motor field-orientation vector control system. The experimental results demonstrate the efficiency of the proposed method for diagnosing single component and arm open-circuit faults.

关 键 词：电压源逆变器 故障诊断 开路故障 开关函数 快速诊断 

分 类 号：TM464[电气工程—电器]