电压源型并网变流器状态监测与故障诊断方法综述

Review of Condition Monitoring and Fault Diagnosis Methods for Grid-connected VSC

电压源型变流器(Voltage source converter,VSC)广泛应用于分布式发电和储能单元等并网领域中,VSC系统严重影响并网系统的稳定运行。开发并网VSC潜在故障的健康状态监测和早期观测识别,对于保证变流器持续安全稳定可靠运行具有重要意义。首先,对并网VSC的主电路结构及常见电气故障进行了总结和分析,包括DC-link电容故障、绝缘栅双极型晶体管(Insulated gate bipolar transistor,IGBT)故障、滤波电感故障、交流侧电流传感器和电压传感器故障等,并阐明了故障发生机理与故障特性;其次,以并网VSC状态监测和故障诊断方法为核心,对国内外学者的相关研究进行了分类和归纳,对比总结了不同状态监测和故障诊断方法的优点和不足;最后,对并网VSC状态检测和故障诊断技术未来的研究方向进行了展望。

Voltage source converter(VSC)is widely used in grid-connected areas such as distributed generation and energy storage units,and the VSC system seriously affects the stable operation of grid-connected system.The development of health state monitoring and early observation and identification of potential faults in grid-connected VSCs is of great significance to ensure the continuous safe,stable and reliable operation of the converter.First,the main circuit structure and common electrical faults of the grid-connected VSC are summarized and analyzed,including DC-link capacitor faults,insulated gate bipolar transistor(IGBT)faults,filter inductor faults,AC-side current and voltage sensor faults,etc.The fault occurrence mechanisms and fault characteristics are also explained.Secondly,with the grid-connected VSC condition monitoring and fault diagnosis methods as the core,the relevant researches of scholars at home and abroad are classified and summarized,and the advantages and shortcomings of different condition monitoring and fault diagnosis methods are compared and summarized.Finally,the future research direction of the grid-connected VSC condition detection and fault diagnosis technology is prospected.