【作者】 王楠；

【导师】 贾清泉； 韩劲松；

【作者基本信息】 燕山大学 ， 电气工程（专业学位）， 2016， 硕士

【摘要】 随着社会的快速发展以及人们生活水平的提高,用户对于供电可靠性的要求越来越高。但是由于传统的保护方案只采用单端电气量进行故障区间判断,所以具有故障切除时间长、保护配合困难以及故障后故障范围容易扩大等一系列缺点。为了解决这一难题,本文提出了一种利用多端电气量进行故障区间判定的逻辑保护方案,具体内容如下:(1)根据所需基本信息来源的不同,将现有的配电网保护方案分为点保护与面保护,并分析了面保护方案设计所必须满足的三个条件;为了便于分析,建立了配电网网络分析模型,并在此基础上利用网络无向图对开环模式下的逻辑保护方案进行了故障分析,并提出了开环模式的保护判据;利用网络有向图对闭环模式下的逻辑保护方案进行了故障分析,并提出了闭环模式下的保护判据。(2)利用配电网络中的FTU收集开关本身以及其邻接开关的故障过流信息,利用这些信息建立网络邻接状态表,根据开关的网络邻接状态表得出不同类型开关的判据向量,将判据向量与判据向量动作集做比对,从而确定故障区间,迅速将故障切除。对算例系统进行故障模拟分析,证明了逻辑保护方案的有效性。提出了分级式后备保护方案,规定了各后备保护的动作时序。最后对配电网逻辑保护方案在架空线路、电缆线路以及变电站中的应用进行了分析。(3)根据配电网逻辑保护方案的特点,选取对等式通信作为逻辑保护方案的通信方案,并对几种对等式网络协议进行了对比分析,并选取了CAN总线作为相应的网络协议,最后对CAN总线的原理与功能进行分析,进而完成了整个逻辑保护的设计。更多还原

【Abstract】 With the rapid development of society and the improvement of people’s living standards, the power supply reliability of users has become increasingly demanding. However, the traditional protection schemes only use a single terminal electrical to judge fault section which due to a series of shortcomings such as a long fault clearing time, cooperation difficulty and an expanded scope of fault. To solve above problem, this paper presents a logic protection scheme which uses multi-terminal electrical quantities to judge fault section. The details are as follows:(1) Considering the difference of required basic information sources, the existing protection scheme can be divided into point protection and side protection, and three prerequisites of side protection scheme is analyzed. The distribution network analysis model is established to make analysis easy. On the above basis, the undirected graph is used to analyze fault which happens in the open-loop mode, and the protection criterions under open-loop mode are proposed. Similarly, the directed graph is used to analyze fault which happens in the closed-loop mode, and the protection criterions under closed-loop mode are proposed.(2) The fault overcurrent information of the switch and the switch’s adjacent switch is collected by FTU in distribution network. The above information is used to establish the network adjacency state table, by which the criterion vectors of different types of switches are obtained. The fault section is determined quickly by comparing the criterion vector and action set, so the fault can be removed quickly. The effectiveness of the logic protection scheme is proved by the fault simulation analysis to example system. The hierarchical backup protection program is proposed, and each action sequence is provided. Finally, some applications of the logical protection scheme such as in overhead lines, cable lines and substation are analyzed.(3) According to the characteristics of distribution network logic protection schemes, the peer–to-peer communication is selected as the communication scheme of logic protection. Several of peer-to-peer network protocols are compared and analyzed, and the CAN bus is selected as network protocols of the logic protection scheme. Finally, the principle and function of CAN bus is analyzed and the whole logic protection design is completed.更多还原