面向智能变电站的广域保护系统研究

发布时间：2018-06-13 15:32

本文选题：智能电网 + 智能变电站　；参考：《沈阳工程学院》2015年硕士论文

【摘要】：近年来,随着国家经济的快速发展,尤其是在大力发展智能电网的大环境下,电力系统的电压等级也随之越来越高,超高压、特高压输电线路的投运,使得区域电网之间的联系越来越密切,电网规模不断的扩大,交换容量不断增加,出现故障和不稳定的几率也大大增加,继电保护系统作为安全稳定运行的"第一道防线",对继电保护系统的要求也越来越高。传统的继电保护只能做到对元件内部进行保护,而忽略了对系统整体的考虑,电力系统本质上是一个广域系统,系统中各电气元件是互相关联的一个整体,所以更应该从全局的角度来考虑保护的问题。本文提出一种面向智能电网的基于广域差动原理的广域继电保护系统,采用区域集中式结构,保证了通信系统的可靠性;基于基尔霍夫定律的差动原理保证了广域保护的可靠性,三级保护区的分区策略及保护IED与保护区关联矩阵的建立使广域保护算法得以顺利实现。该继电保护系统以智能变电站为支撑,将继电保护系统由原来的"点"保护升级到现在的"面"保护,不仅能够实现发生故障后,快速、准确、可靠地切除故障区域,而且能够对故障隔离后的电网进行在线实时安全分析,以确定是否会有发生大范围停电的可能性,并在必要时采取适当的措施以防止系统大规模停电事故的发生。本文针对辽宁朝阳地区66kV实际区域电网利用RTDS进行了仿真验证,利用RTDS建模与广域保护系统构成闭环仿真系统,仿真结果表明:广域保护系统能快速、准确地对各类故障进行判别与动作,能准确地切除故障区域,而且不会扩大故障影响范围,能有效地保护电网安全可靠运行。
[Abstract]:In recent years, with the rapid development of national economy, especially in the great environment of developing smart grid, the voltage level of power system becomes higher and higher, and the UHV transmission line is put into operation. The connection between the regional power grid is getting closer and closer, the scale of the network is expanding, the exchange capacity is increasing, and the probability of failure and instability is also greatly increased. As the first line of defense for the safe and stable operation of relay protection system, the requirement of relay protection system is becoming higher and higher. The traditional relay protection can only protect the components inside, but neglects the consideration of the whole system. The power system is essentially a wide area system, and the electrical components in the system are interrelated as a whole. Therefore, we should consider the problem of protection from the overall perspective. In this paper, a wide area relay protection system based on wide area differential principle for smart grid is proposed, which adopts the regional centralized structure to ensure the reliability of the communication system. The principle of differential protection based on Kirchhoff's law ensures the reliability of wide area protection. The relay protection system is supported by intelligent substation, and the relay protection system is upgraded from the original "point" protection to the present "surface" protection. It can not only realize the quick, accurate and reliable removal of the fault area after the fault occurs. Furthermore, the on-line real-time security analysis can be carried out on the power grid after fault isolation to determine whether there is a possibility of large-scale power outages, and to take appropriate measures to prevent large-scale power outages if necessary. In this paper, the RTDS is used to simulate 66 kV actual area power network in Chaoyang area of Liaoning province. The simulation system is composed of RTDS modeling and wide area protection system. The simulation results show that the wide area protection system can be used quickly. The fault area can be removed accurately and the influence area of the fault will not be enlarged, so it can effectively protect the power grid operation safely and reliably.
【学位授予单位】：沈阳工程学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM77;TM63;TM76

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