由于新型静止无功发生装置（ＡＳＶＧ）的主回路拓扑结构复杂，如何迅速、有效地进行在线监测和故障定位成了ＡＳＶＧ的一个重要问题。文章针对由电压型逆变器多重化构成的ＡＳＶＧ系统，提出了一个诊断电力电子装置开关管或续流管开路故障的新方案（参考模型法）。通过研究特征函数ＣＦＦ，即实际系统与参考模型特征输出量的差，进行故障诊断。应用参考模型法进行故障诊断具有输入量少而且判据简单的特点。利用电力电子仿真软件ＰＳＩＭ对３００ｋｖａｒＡＳＶＧ系统的仿真计算验证了应用参考模型法诊断故障是可行的，而且是有效的。 Due to the complexity of the main loop topology of the new static var generator (ASVG), how to quickly and effectively perform on-line monitoring and fault location is an important issue for ASVG. Aiming at the ASVG system composed of multiple voltage inverters, a new scheme to diagnose the open circuit fault of switchgear or free-wheeling tubes in power electronic devices is proposed. (Reference model method). Through the study of the characteristic function CFF, that is, the difference between the actual system and the reference model feature output, fault diagnosis. Application of reference model method for fault diagnosis with less input and the criterion is simple. The simulation calculation of 300kvarASVG system using power electronic simulation software PSIM verifies that it is feasible and effective to diagnose the fault by using reference model method.