直流系统继电误动作半实物仿真平台设计与分析

变电站直流系统中接地故障引起的继电器误动作会造成安全隐患。利用计算机半实物仿真技术,在eMEGAsim实时仿真器中搭建了用于分析直流系统继电器误动作的仿真平台,通过替代原理将实物继电器取代其在RT-LAB软件中的仿真模块,并保持原仿真模型整体电气特性不变,实现仿真模型和工程实物的有效联接。利用搭建的半实物仿真平台,分别分析了不同接地电阻值和系统分布电容对继电器误动的影响。相对于离线仿真,该半实物仿真平台能够有效提高仿真分析速度,真实展现开关实物动作过程,分析结果对实际调试有一定的参考意义。

Design of HILS platform and Analysis on the DC system relay misoperation

In substation DC system, the relay mis-operation caused by ground fault may lead to hidden danger for the power system.Based on computer HILS ( hardware in-the-loop simulation) technology, a simulation platform with eMEGAsim real-time simulator is built to analyze the relay mis-operation of DC system.In the platform, through the substitution principle, the relay model block in the RT-LAB software is replaced by a real object, and the whole elec-trical characteristics of original simulation model keeps unchanged, which could realize the effective connection be-tween the mathematical model and the engineering object.The influences of different resistance values and the system cable capacitance on the relay mis-operation are analyzed through the platform.Compared with off-line simulation, the HILS platform can effectively improve the speed of simulation analysis, show the real switching action process, and the analysis results have reference significance to the actual debugging.