站域保护构成方案及算法研究

发布时间：2018-05-26 19:45

本文选题：站域保护 + 站域电流差动　；参考：《华北电力大学》2014年硕士论文

【摘要】：随着计算机、通信等技术的不断进步,电网发展对继电保护提出更高的要求,基于多源信息的站域保护能够克服传统保护仅获取本地信息的先天性不足,已成为当前研究的热点。木文在研究站域保护的功能和构成模式的基础上,根据所需信息类型,提出了两种站域保护方案：一种是利用站域范围内电气量信息、基于电流差动原理的站域保护方案,一种是利用站域范围内保护动作冗余信息、基于保护信息融合的站域保护方案,最后以贵州都匀实际工程为依托实现并测试了站域保护功能。利用各电流采样值信息,提出了一种基于电流差动原理的站域保护方案,首先定义了四类差动区,并对各差动区内故障进行分析,然后设定了各差动区的动作方案,站域范围内各类元件故障时的动作结果表明,通过四类差动区之间协调配合,该方案可以有选择性的快速切除站域范围内的故障,有效地改善并提升保护的整体性能。利用就地保护的动作信息,提出了一种基于保护信息融合的站域保护方案。首先根据保护对各元件的有效保护范围计算出保护对元件故障识别的支撑度,然后将其作为保护动作的权重,构建站域电流保护融信度函数以及融信度期望函数,最后根据二者比值即融信因子识别故障元件。结果表明该方案能正确快速识别故障元件,且能够应对信息缺失及错误的情况,具有良好的适应性以及一定的容错能力。基于贵州都匀地区实际电网模型,选取其中最具代表性的变电站新寨变作为站域保护的测试对象,首先在RTDS仿真平台中搭建了系统模型并配置相应的站域保护模块,然后对站域保护功能进行了测试,测试结果验证了所提站域保护方案的正确性及可行性。
[Abstract]:With the development of computer, communication and other technologies, the development of power grid has put forward higher requirements for relay protection. The station area protection based on multi-source information can overcome the congenital deficiency of traditional protection which only obtains local information. It has become the hot spot of current research. On the basis of the function and structure mode of station domain protection, according to the type of information needed, this paper puts forward two kinds of station domain protection schemes: one is to use the electric quantity information in the station domain, and the other is to protect the station area based on the principle of current differential operation. One is to utilize the redundant information of protection action within the station area, and the protection scheme based on the protection information fusion. Finally, based on the actual project of Guizhou Duyun, the protection function of the station domain is realized and tested. Based on the information of each current sampling value, a protection scheme based on the principle of current differential is proposed. Firstly, four kinds of differential regions are defined, and the faults in each differential region are analyzed, then the action schemes of each differential region are set up. The operation results of various components in the station range show that the scheme can selectively and quickly remove the faults in the station area by coordinating the four kinds of differential regions and effectively improve and enhance the overall performance of the protection. Based on the action information of local protection, a protection scheme based on protection information fusion is proposed. Firstly, according to the effective protection range of each component, the support degree of the protection to the component fault identification is calculated, and then as the weight of the protection action, the reliability function and the expected function of the fusion reliability of the current protection in the station domain are constructed. Finally, the fault elements are identified according to the ratio of the two, that is, the fusion factor. The results show that the proposed scheme can identify fault components correctly and quickly, and can deal with the situation of missing and wrong information. The scheme has good adaptability and fault tolerance. Based on the actual power network model of Duyun area in Guizhou province, the most representative substation Xinzhai transformer is selected as the test object of the station area protection. Firstly, the system model is built in the RTDS simulation platform and the corresponding station protection module is configured. Then the station domain protection function is tested and the test results verify the correctness and feasibility of the proposed protection scheme.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM77

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