智能变电站二次系统的可靠性及风险评估

发布时间：2018-03-10 22:18

本文选题：智能变电站　切入点：二次系统　出处：《西南交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：在国网公司的倡导下,基于IEC61850的智能变电站得到快速的发展与应用,基于新理念和新技术的新设备大量涌现,智能变电站二次设备的信号输入输出方式、通信架构、系统集成度及智能化水平等方面都发生了很大的变革,在坚强智能电网的背景下,研究二次系统的可靠性具有重要意义。随着对智能变电站二次系统可靠性研究的不断深入,传统的可靠性研究方法和指标已经不能全面反映二次系统的运行状况,对二次系统的实时可靠性和风险评估逐渐为人们所关注。本文从保护系统的风险评估和二次系统的实时可靠性两个方面展开研究,具有较好的理论意义。本文研究了智能变电站保护系统的可靠性及不同失效情景对电力一次系统的影响。根据Markov状态转移图,得到各二次装置的可用度。结合分布式保护系统的组成,获得保护系统的稳态误动率、稳态拒动率和稳态可用度。针对保护系统的误动、拒动及断路器的拒动,定性地分析其对电力一次设备运行的影响范围,定量地研究了保护系统不同失效情景对一次系统供电可靠性的影响。本文研究了智能变电站保护系统的运行风险。针对保护系统的不同失效情景,分析了各间隔的保护系统的失效后果,以失负荷量和电力一次系统实时故障频率的相对值综合表示保护系统的失效后果,结合不同失效情景的发生概率,得到保护系统的运行风险,包括基准风险、实时风险及智能变电站整个保护系统的综合风险。对220kV智能变电站的研究结果表明,220kV母线保护系统和主变保护系统的基准风险最大。对于双重化配置的保护系统,在一套保护已经停运的前提下,各类保护系统的实时风险大幅提高,保护系统拒动的实时风险占据了主导地位。本文研究了智能变电站二次系统的实时可靠性。依据IEC61850,将二次系统分解成不同类型分布式功能集合。对各分布式功能分类,由专家为各类功能打分排序,采用结构熵权法,获得各分布式功能的权重。给出了逻辑节点故障时的扰动度和二次系统完整度的定义及其计算公式。针对220kV智能变电站,分析了由于逻辑节点故障导致失效的子功能集合、二次设备故障导致失效的子功能集合。计算了逻辑节点和二次设备的扰动度和二次系统的实时完整度。
[Abstract]:At the initiative of the national network company, intelligent substation based on IEC61850 has been rapidly developed and applied, new equipment based on new idea and new technology has emerged in large numbers, signal input and output mode of secondary equipment in intelligent substation, communication structure, Great changes have taken place in the aspects of system integration and intelligent level. Under the background of strong smart grid, it is of great significance to study the reliability of secondary system. The traditional reliability research methods and indexes can no longer fully reflect the running status of the secondary system. People pay more and more attention to the real-time reliability and risk assessment of the secondary system. In this paper, the risk assessment of the protection system and the real-time reliability of the secondary system are studied. This paper studies the reliability of intelligent substation protection system and the influence of different failure scenarios on the primary power system. According to the Markov state transition diagram, The availability of each secondary device is obtained. Combined with the composition of the distributed protection system, the steady-state misoperation rate, steady-state rejection rate and steady-state availability of the protection system are obtained. Qualitatively analyzing its influence on the operation of power primary equipment, The influence of different failure scenarios of protection system on the reliability of primary power supply is studied quantitatively. The operational risk of intelligent substation protection system is studied. The failure consequences of the protection system at different intervals are analyzed. The relative values of the loss of load and the real time fault frequency of the primary power system are used to comprehensively express the failure consequences of the protection system, and combined with the occurrence probability of different failure scenarios. Operational risks, including baseline risks, of protected systems, The research results of 220kV intelligent substation show that the reference risk of 220kV busbar protection system and main transformer protection system is the greatest. Under the premise that a set of protection has been shut down, the real-time risk of various protection systems has been greatly increased. In this paper, the real-time reliability of the secondary system of intelligent substation is studied. According to IEC 61850, the secondary system is decomposed into different types of distributed function sets. The weight of each distributed function is obtained by using the structure entropy weight method. The definition and calculation formula of disturbance degree and secondary system integrity degree in the fault of logic node are given, and the calculation formula for 220 kV intelligent substation is given. In this paper, the set of subfunctions caused by the failure of logic node and the set of sub-functions caused by failure of secondary equipment are analyzed, and the disturbance degree of logic node and secondary equipment and the real-time integrity of secondary system are calculated.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM63;TM76

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