兆瓦级NBI加热系统弧流电源故障诊断方法探究

针对中国环流器2号A(HL-2A)装置弧流电源的特点，以及弧流电源故障诊断的条件与现状，提出了结合中性束注入(NBI)控制系统的相关功能模块与基于Matlab/Simulink仿真技术构建的故障字典，以实现弧流电源运行状态的在线监测及其故障模式的诊断。NBI控制系统在监测到弧流电源故障状态后，调用存储的弧流电源输出信号进行分析，提取信号的特征值，然后通过查找弧流电源故障字典以诊断出可能的故障模式。结合实验数据论证了该故障诊断法对弧流电源简单故障定位准确，对复杂故障能缩小定位范围，具有原理简单、可操作性强等优点。

New advances in fault diagnosis method of arc power supply for MW neutral beam injector heating system

According to the characteristics of arc power supply (APS) on HL-2A tokamak and the conditions and present status of the fault diagnosis of APS, this paper proposes a scheme which combines the relevant functional modules of the NBI control system and the fault dictionary constructed based on the Matlab/Simulink simulation technology so as to realize the on-line monitoring for the real time state and diagnosis of fault mode of APS. After monitoring the fault of APS, the NBI control system would call the stored output signals of APS for analysis, extracting eigenvalues of signals, and then diagnosing the possible fault modes by APS fault dictionary lookup. Finally, this paper combines experimental data to demonstrate that the fault diagnosis method is accurate for the simple fault location of APS, and can narrow the positioning range for complex faults. It has the advantages of simple principle and strong operability.