基于电压–能量反比特性的避雷器型最后断路器保护优化策略研究  

Study of Improved Arrester Based Last Circuit Breaker Protection Strategy Based on Voltage-Energy Inverse Proportional Characteristics

作　　者：林湘宁[1] 何英发 谢志成[1] 李正天[1] 童重立 谭爱国[1] Muhammad Shoaib Khalid 

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),湖北省武汉市430074 [2]国网浙江省电力公司舟山供电局,浙江省舟山市316000

出　　处：《中国电机工程学报》2017年第12期3400-3408,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51277082;51577077)~~

摘　　要：最后断路器保护主要用于防止逆变站交流系统甩负荷所引起的严重过电压对系统设备造成的不良影响。除了常规型的最后断路器保护,特高压换流站还配置有避雷器型最后断路器保护作为后备保护。但是,此类保护还存在对过电压水平无法实现动作速度的适应性的问题。针对现有基于固有电压量积分方法存在的缺陷,提出了基于电压实时测量量的避雷器型最后断路器保护改进方法,并提出了基于电压–能量反比特性的避雷器型最后断路器保护动作门槛值的动态整定策略。该文参照向家坝—上海特高压直流输电系统实际参数搭建仿真模型,并通过仿真算例验证了该文方法在保证动作可靠性的前提下,可以进一步缩短系统设备承受高倍过电压的时间,更好地保护主设备。The last circuit breaker protection is used for preventing the adverse effect on equipment caused by severe over-voltage when all the AC loads in the inverter side are shedding. In addition to conventional last circuit breaker protection, UHVDC convertor station is also equipped with arrester based last circuit breaker protection as backup protection. However, problem also exists on arrester based last circuit breaker protection for its adaptability of action speed under different over-voltage factors. To cover the deficiency of the existing method, firstly, instead of constant, the power integration of arrest was obtained by using real-time voltage, which form an improved arrest-based last circuit breaker protection. Besides, in order to improve the performance of the protection, a dynamic setting strategy of threshold based on the inverse characteristic of voltage and energy was proposed. Secondly, an UHVDC simulation model was established according to the actual parameters of Xiangjiaba-Shanghai UHVDC transmission system, which meet the demand of research. A series of simulation examples show that the improved method can shorten the duration time of equipment withstanding severe over-voltage under the premise of guaranteed operating reliability, which can protect the equipment in safe.

关 键 词：最后断路器保护 实时电压 电压–能量反比特性 动态整定 

分 类 号：TM722[电气工程—电力系统及自动化]