智能变电站保护功能自动校验研究

Research on Automatic Checking of Protection Functions for Smart Substation

智能变电站架构及其功能分布的变化,使保护功能的监测及校验范围不再局限于单套装置,需要从系统的角度,对功能实现的各个环节进行周密监视及测试。为此对智能变电站保护功能自动校验进行了研究,设计了自动校验实现的方案。通过在智能变电站保护系统的设备应用软件实现中附加各种校验手段,对保护系统的各个功能实现环节进行校验及检测,利用基于证据理论的专家系统实时配置校验方案,并对校验信息进行实时分析,得出校验结论。该方案提升了智能变电站保护系统的自诊断、自监测能力,充分利用了智能变电站的数字化采集和信息交互优势,可应用于现场调试校验,部分功能也可以在运行中对保护进行在线监测。

The considerable variability of architecture and function realization of smart substations, which differ from traditional substations, makes the range of protection function check no longer restricted to one device, so it is necessary to carry out thorough monitoring and testing for various links of functional implementation. For this purpose, the automatic checking of protection functions for smart substation is researched, and a scheme for the implementation of the automatic checking is designed. By means of adding various checking manners to application software implementation of the devices of protection system for smart substation, the checking and detection of various function implementation links of the protection system are performed, and by use of the expert system based on Dempster-Shafer theory a real-time virtual checking scheme is configured and through real-time analysis on checking information the conclusion of the checking is obtained. The proposed scheme enhances the self-diagnosis and self-monitoring ability of protection system for smart substation and gives full play to the superiority in digital information acquisition and information interaction of digital substation, so it can be used to the checking during on-site commissioning, besides, partial functions can be also used to perform on-line monitoring of protections being operated.