直流线路行波保护解析整定方法  

Analytical Method for Travelling Wave Protection Setting of HVDC Transmission Line

作　　者：梁益[1] 蔡泽祥[1] 田得良 李晓华[1] 李书勇[2] 

机构地区：[1]华南理工大学电力学院,广东省广州市510640 [2]中国南方电网科学研究院有限责任公司,广东省广州市510080

出　　处：《电网技术》2017年第1期298-304,共7页Power System Technology

基　　金：国家自然科学基金项目(51377059)~~

摘　　要：直流线路行波暂态过程存在色散衰减、双极耦合等问题,导致故障量难以解析;保护装置采样具有随机性,进一步增加了判据特征量定量计算的难度,因此行波保护仍缺乏统一、有效的整定方法。从选择性、灵敏性要求出发分析了行波保护整定需求,针对关键故障位置建立了可用于整定计算的故障量解析模型。为消除保护采样随机性,提出了保护判据特征量解析计算方法。最后结合保护特征量随过渡电阻、雷击扰动幅值变化的特性曲线求取保护定值,该定值具有最优的抗过渡电阻能力和抗雷击扰动能力。与实际直流线路保护定值及保护边界的对比分析验证了所提解析整定方法的有效性。Some problems exist in travelling wave transient process of HVDC transmission line, such as chromatic dispersion attenuation and bipolar coupling, making it difficult to analyze fault quantities. In addition, protection device sampling is stochastic, further increasing difficulty of quantitative analysis of criterion characteristic parameters. Therefore, a unified and effective setting method is absent in travelling wave protection. This paper analyzed demand of travelling wave setting from perspective of selectivity and sensitivity, and established a fault quantity analytical model for setting calculation based on key fault locations. In order to eliminate protection sampling randomness, an analytical calculation method of criterion characteristic parameters was proposed. According to characteristic curve demonstrating characteristic parameter changes due to transition resistances and lightning disturbances, protection setting was calculated. This setting has extraordinary ability against transition resistance and lightning disturbance. Comparative analysis of protection setting of actual HVDC transmission line and protection boundary verified validity of the proposed analytical setting method.

关 键 词：高压直流 行波保护 故障解析 保护整定 

分 类 号：TM72[电气工程—电力系统及自动化]