变电站二次系统故障闭环定位技术研究

Research on Closed-Loop Fault Location Technology of Substation Secondary System

变电站二次系统联调可以测试各系统单元的性能及其互操作性,验证二次系统的可靠性和安全性,测试系统对标准、规程的执行情况。提出一种基于闭环自动验证模型的变电站二次系统高效联调及故障智能诊断定位技术。创新性地构建了闭环自动验证模型,并借助实时数字仿真(RTDS)设计了高效联调方案。利用RTDS平台构建一次系统(电源、断路器、变压器、线路、负荷)仿真模型,并对仿真模型进行离散化。通过设置故障求解闭环测试过程所需要的电压和电流值,生成测试项目。模拟二次系统故障诊断过程。通过计算故障发生概率,准确分析故障诊断结果并精确定位故障节点。所提方案具备联调高效、智能故障诊断准确、故障定位精确等功能,对提高变电站,特别是智能变电站的安全、稳定、经济运行具有重要的借鉴意义。

The joint commissioning of the substation secondary system can test the performance and interoperability of various system units,verify the reliability and safety of the secondary system,and test the system’s implementation of standards and regulations.An efficient joint debugging and intelligent fault diagnosis and location technology for substation secondary systems based on a closed-loop automatic verification model is proposed. A closed-loop automatic verification model is innovatively constructed,and an efficient joint debugging scheme is designed with the help of real time digital simulation(RTDS). By using the RTDS platform, a simulation model of the primary system (power supply, lircuit braker, transformer,line,load) is built, and the simulation model is discreetizedct. By setting the voltage and current values required for the closed-loop test process of fault solving,generate test items. The secondary system fault diagnosis process is simmlated. By calculateing the probability of fault occurrence, the fault diagnosis results are accurately analyzed, and the fault nodes are accurately located.The proposed programme has the functions of efficient joint debugging,accurate intelligent fault diagnosis,and accurate fault location,has important reference significance for improving the safe,stable,and economic operation of substations,especially intelligent substations.