基于动态权重修正D-S证据理论的最后断路器多判据保护跳闸策略  

Tripping Strategy of Multi Criteria of Last Breaker Protections Based on Dynamic Weight Correction D-S Evidence Theory

作　　者：林湘宁[1] 刘畅 汪致洵 谢志成 何英发 李正天[1] 童重立 邓科 黄景光[5] LIN Xiangning;LIU Chang;WANG Zhixun;XIE Zhicheng;HE Yingfa;LI Zhengtian;TONG Chongli;DENG Ke;HUANG Jingguang(State Key Laboratory of Advanced Electromagnetic Engineering and Technology （School of Electrical and Electronic Engineering, Huazhong University of Science and Technology）, Wuhan 430074, Hubei Province, China;Extra-High Voltage Transmission Company of CSC~ Guangzhou 510663, Guangdong Province, China;Zhoushan Power Supply Bureau, Zhoushan 316000, Zhejiang Province, China;State Grid Hubei Electric Power Company Overhaul Branch, Wuhan 430050, Hubei Province, China;College of Electrical Engineering ＆ New Energy, China Three Gorges University, Yichang 443000, Hubei Province, China)

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学电气与电子工程学院),湖北省武汉市430074 [2]中国南方电网有限责任公司超高压输电公司,广东省广州市510663 [3]国网浙江省电力公司舟山供电局,浙江省舟山市316000 [4]国网湖北省电力公司检修公司,湖北省武汉市430050 [5]三峡大学电气与新能源学院,湖北省宜昌市443000

出　　处：《中国电机工程学报》2018年第9期2609-2621,共13页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51477090,515770777);中央高校基本科研业务费专项资金资助(HUST:2014QNRC042);国家电网公司科技项目(SGTYHT/15-JS-191)~~

摘　　要：最后断路器保护是高压直流输电系统中所配置的重要保护之一,由于直流系统的运行场景复杂多样,单一的最后断路器保护并非适用所有场景。实际应用时通常使用＂3取2＂的表决策略进行多保护判据融合,然而在某些场景下可能存在多数单一判据判断错误,进而导致＂3取2＂策略的正判率不高。提出2种改进的避雷器型最后断路器保护方案,并结合现有常规型最后断路器保护方案,设计一种基于动态权重修正D-S证据理论的最后断路器多判据保护跳闸策略。基于动态临近历史数据的判断结果,根据上两次保护动作情况融合得到的权重系数,通过使用D-S证据理论对本次结果冲突的各项判据进行融合,以提高保护在各种场景下的正判率。最后根据±800k V向家坝—上海特高压直流输电系统构建仿真模型,在1000种随机场景及12例单一判据连续交替判断正确的情况下对比所提策略与其他多种方法的判断结果,其中该文策略的正判率分别达到98.5%及50%,均优于其他几种策略,以此验证该策略的有效性及优越性。The last breaker protection is one of the most important protection of high voltage direct current（HVDC） transmission system. Due to various operation scenarios of HVDC, single criterion of last breaker protection cannot suit every scenario. The ＂2-out-of-3＂ voting strategy is often used in practice to integrate multiple protection criteria, however, it is possible that the majority of criteria make mistakes in some scenarios, which may reduce the correct-judgement rate of ＂2-out-of-3＂ voting strategy. Combining with the existing arrester based last circuit breaker protection and two kinds of improved protections, a tripping strategy of arrester based last breaker protections based on dynamic weight correction D-S evidence theory was designed to integrate different results in this paper. According to the weight coefficient obtained by previous two protection actions, D-S evidence theory was used to integrate the results of different criteria, so as to improve thecorrect rate of protection in various scenarios. At last, by constructing a simplified simulation model of ±800 k V ＂Xiangjiaba-Shanghai＂ ultra high voltage direct current（UHVDC） transmission system, the accuracy of the proposed strategy and other combining methods were compared in 1000 cases and other 12 cases, the accuracy rates are 98.5% and 50% respectively, both of them are the highest among all the methods, thus the effectiveness and superiority of the proposed strategy are verified.

关 键 词：特高压直流输电系统 最后断路器保护 信息融合 动态权重修正 D-S证据理论 

分 类 号：TM77[电气工程—电力系统及自动化]