项目名称: 基于参数识别原理的特高压输电线路纵联差动保护研究
项目编号: No.50877061
项目类型: 面上项目
立项/批准年度: 2009
项目学科: 金属学与金属工艺
项目作者: 康小宁
作者单位: 西安交通大学
项目金额: 36万元
中文摘要: 特高压输电线路对继电保护的动作性能提出了更高的要求,目前基于工频电气量的保护受分布电容电流,数据同步、并联补偿支路的影响,动作灵敏度不足,不能满足特高压输电线路的保护要求。基于故障暂态信号的行波保护和暂态量保护易受干扰影响,可靠性差。本项目从网络分析理论出发,通过建立网络响应和网络参数之间的数学模型,利用网络的全响应信号,采用模型参数识别的方法得到故障网络的故障参数信息构成保护原理。参数识别的保护原理动作判据直接反映线路结构和参数的变化,不受分布电容和并联补偿支路运行方式变化的影响。基于参数识别的综合阻抗差动判据无需双端数据同步,通过与现有纵联保护的配合可以大大提高纵联保护的动作灵敏度。该项目的研究成功将为纵差保护原理研究开拓新的思路,为解决特高压输电线路纵联保护应用的众多技术难题提供方案。
中文关键词: 参数识别;纵联保护;特高压输电线路
英文摘要: With the development and application of EHV/UHV transmission lines, it becomes more important to improve the performance of protective relayings. At present, the pilot protection, mainly based on fundamental frequency component, has low sensitivity due to the affection of capacitive currents, data synchronism and parallel compensation branch. Meanwhile, the transient based protection is with lower reliability. Both of them can not satisfy the demand of power system operation.Based on linear circuit theory, this project analyzes the relationship between network response and net work parameter. Using the full response and parametr identification method, it can obtain fault information such as fault location, fault type et al. All these fault information can be used in protection relaying. The parameter identification based protection technique use the change of network topology and component parameter as fault detection criterion, is immune to capacitive current and parallel compensation branch. The idea proposed by this project provide a new path to solve the practical problem of pilot protection for EHV/UHV transmission lines.
英文关键词: Parameter identification; Pilot protection; EHV/UHV transmission lines