智能变电站继电保护可靠性研究

发布时间：2018-04-02 11:14

本文选题：智能变电站　切入点：继电保护　出处：《广东工业大学》2014年硕士论文

【摘要】：基于IEC61580标准的智能变电站保护控制体系构筑在网络通信基础上,信息网络化传输可以实现高度信息共享,但是其实时性、安全性和可靠性直接决定了保护控制决策的有效性。而且智能变电站继电保护将原来独立继电保护装置的功能分解在不同的IED(intelligent electronics device)中实现,从而使得影响继电保护可靠性的因素和环节更加复杂和多元化。这些变化使得智能变电站的继电保护系统从系统结构和元件构成较传统变电站有很大的差异。如何对智能变电站继电保护系统进行准确的可靠性评估,发现系统中的薄弱环节并加以改正,提高保护的可靠性,具有较大的理论和实际价值。本文首先对智能变电站进行了简单的介绍,在此基础上分析了其继电保护系统组成,然后以国电南自的广东电网220kV智能变电站方案中过程层网络接线方式为原型,采用可靠性框图构建了智能变电站在SV和GOOSE报文分网传输的结构可靠性模型,最后采用最小路集和不交化算法,研究实际变电站主变保护、110kV线路保护、220kV线路保护和母线保护的可靠性。结果表明,在报文分网传输方式下,线路保护和主变保护的可靠性相当,母线保护的可靠性很低。紧接着论文深入到元件层面,将元件重要度分析引入到智能变电站继电保护系统中。选择Birnbaum重要度、参数敏感性和关键重要度三个指标用于评测智能变电站继电保护系统的元件重要度,并对结果进行了分析,通过Birnbaum重要度和参数敏感性可以帮助设计工作者定位系统中的薄弱元件,更好进行系统的前期规划和设计：关键重要度用于系统运行阶段帮助检修人员合理分配维修资源以提高检修效率。最后论文针对母线保护可靠性过低的问题,采用了环型网络结构的以太网冗余技术,并且构建了新方案下母线保护的可靠性框图,通过计算结果对比发现改进方案母线保护的各可靠性指标都有比较明显的提升本论文受到国家自然科学基金项目(51377026)的资助。
[Abstract]:The intelligent substation protection control system based on IEC61580 standard is built on the basis of network communication. The safety and reliability directly determine the effectiveness of the protection control decision, and the function of the original independent relay protection device is decomposed into different IED(intelligent electronics device by intelligent substation relay protection. As a result, the factors and links affecting the reliability of relay protection are more complex and diversified. These changes make the relay protection system of intelligent substation more different from the traditional substation in terms of system structure and component composition. How to evaluate the reliability of intelligent substation relay protection system accurately, It is of great theoretical and practical value to find the weak links in the system and correct them to improve the reliability of the protection. This paper first introduces the intelligent substation, then analyzes its relay protection system composition, and then takes the process layer network connection mode in the 220kV smart substation scheme of Guangdong power grid as the prototype. The reliability block diagram is used to construct the structural reliability model of intelligent substation transmission in SV and GOOSE packet separation networks. Finally, the minimum path set and disjoint algorithm are adopted. The reliability of line protection and bus protection for 110kV line protection and bus protection in substation is studied. The results show that the reliability of line protection and main transformer protection is equal to that of main transformer protection under packet separation transmission mode, but the reliability of bus protection is very low. Then the paper goes deep into the component level and introduces the component importance analysis into the intelligent substation relay protection system. Select the Birnbaum importance. Three indexes of parameter sensitivity and critical importance are used to evaluate the component importance of intelligent substation relay protection system, and the results are analyzed. Through Birnbaum importance and parameter sensitivity, the designer can help to locate the weak components in the system. Better pre-planning and design of the system: the key importance degree is used to help the maintenance personnel to allocate the maintenance resources to improve the maintenance efficiency. Finally, aiming at the low reliability of busbar protection, the Ethernet redundancy technology of ring network structure is adopted, and the reliability block diagram of bus protection under the new scheme is constructed. By comparing the calculation results, it is found that the reliability indexes of the improved bus protection are obviously improved. This paper is supported by the National Natural Science Foundation of China (51377026).
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM63;TM77

【引证文献】