智能配电网继电保护研究与应用

发布时间：2019-01-17 19:01

【摘要】：继电保护是电力网的“安全卫士”,任何设备都不允许无保护运行。而配电网又是最末端电网,保护配合问题相当困难,基本无级差。目前配电网保护均是依靠变电所10kV出线保护。当配电网发生故障时,均直接跳开变电所出线,引起整条线路用户停电。停电面积大,影响范围广,给用户直接带来的经济损失不可估量。本文研究的智能配电网继电保护是在综合了集中式馈线自动化和智能分布式馈线自动化优点的前提下,基于EPON通信网络,提出了一种全新的配电网保护控制方法。该保护控制方法在系统组织架构上提出了时间维与空间维的概念。通过两者协调配合,提升配电网继电保护性能和快速恢复非故障区域供电能力。空间维度主要分为主站层、区域层与终端层,通过分层、分布、开放的网络系统,实现系统各层次的协调。时间维度上主要构筑了智能配电网的三层保护防线,实现了配电网继电保护无级差配合。在保护动作原理方面,首先对配电网进行了网架区域划分,根据线路故障时,各区域不同的特点,研究了保护故障区域判据,且能适应配电网开环、闭环、分布式电源接入等各种运行方式。确定了智能配电网保护通信网络,终端层智能终端经过EPON网络互联,通过利用IEC61850 GOOSE技术与各相邻智能终端之间横向通信,不依赖于主站层,实现配电网故障点的快速定位与隔离。在故障成功隔离后,通过区域层控制子站的控制,主要研究了非故障区域怎样恢复供电,实现智能配电网的一个自愈功能。针对自愈功能的研究,主要探讨了区域备投策略优先级原则、区域备投实现方式以及区域备投充放电条件等。且能够适应分布式电源的接入,自适应电网运行方式的调整。通过对网络拓扑保护装置与区域控制子站GOOSE通信测试表明,该保护控制系统能精确定位故障范围并迅速隔离,且能通过区域控制子站备投功能实现非故障区域的持续供电,对提高系统供电可靠性意义重大。
[Abstract]:Relay protection is the "security guard" of the power network, and no equipment is allowed to operate without protection. Distribution network is the most terminal network, protection coordination problem is very difficult, basically no differential. At present, distribution network protection is dependent on substation 10kV line protection. When the distribution network breaks down, they all jump directly out of the substation and cause the power failure of the whole line. The power cut area is large, the influence scope is wide, the direct economic loss that brings to the user is inestimable. On the premise of integrating the advantages of centralized feeder automation and intelligent distributed feeder automation, the intelligent distribution network relay protection is studied in this paper. Based on EPON communication network, a new control method of distribution network protection is proposed. In this method, the concepts of time dimension and space dimension are put forward in the system organization framework. Through the coordination of the two, the performance of relay protection and the ability of fast recovery of power supply in non-fault area can be improved. The spatial dimension is mainly divided into main station layer, area layer and terminal layer. The coordination of all levels of the system is realized through hierarchical, distributed and open network system. In time dimension, the three-layer protection defense line of smart distribution network is constructed, and no differential coordination of relay protection in distribution network is realized. In the aspect of protection operation principle, first of all, the distribution network is divided into the grid area. According to the different characteristics of each region, the protection fault zone criterion is studied, and it can adapt to the distribution network open loop and closed loop. Distributed power access and other modes of operation. The intelligent distribution network protection communication network is determined. The terminal layer intelligent terminal is interconnected through the EPON network. By using IEC61850 GOOSE technology to communicate horizontally with each adjacent intelligent terminal, it does not depend on the master layer. The fast location and isolation of distribution network fault points are realized. After the successful isolation of the fault, through the control of the sub-station of the area layer control, the paper mainly studies how to restore the power supply in the non-fault area and realize a self-healing function of the intelligent distribution network. Based on the research of self-healing function, this paper mainly discusses the priority principle of regional standby strategy, the implementation mode of regional standby, and the conditions of regional standby charging and discharging. And can adapt to the access of distributed power supply, adaptive power grid operation mode adjustment. The GOOSE communication test between the network topology protection device and the regional control sub-station shows that the protection control system can accurately locate the fault range and isolate rapidly, and can realize the continuous power supply in the non-fault area through the regional control sub-station backup function. It is of great significance to improve the reliability of power supply system.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM76;TM77

【共引文献】