分布参数电路模型及其在特高压线路保护中的应用研究-电气工程专业论文.docx

重庆大学 重庆大学硕士学位论文 英文摘要 PAGE PAGE IV At last, based on the proposed distributed parameter circuit model, a transient based ultra-high-speed protection algorithm for UHV transmission line is presented. When the line is in a normal or external fault operation state, the current and voltage of one terminal calculated by the distributed parameter circuit model are almost equal to the sampled dates; when the line is in an internal fault operation state, the distributed parameter circuit model is broken with the influence of the fault branch and the calculated current and voltage dates are quite different from the sample ones. So, the Model-Protection takes product of the mean absolute error between the calculation currents and sampling currents of one terminal within a very short time after fault occurring and the mean absolute error between the calculation voltages and sampling voltages of the same terminal at the same period time as the protection operation component to distinguish internal fault from external fault. Using current and voltage multiplication joint judgment make the fault features more obvious which improves the senility of the protection. ATP is used to build a 1000kv UHV transmission line model to simply research the performance of Model-Protection for common breakdown types. Simulation results showed that the proposed Model-Protection algorithm have good reliability, senility, rapidity and fault phase selection capability. Keywords: ultra-high voltage, distributed capacitive current, the distributed parameter circuit model, transient based protection 重庆大学 重庆大学硕士学位论文 目 录 目 录 中文摘要I 英文摘要 II 1 绪 论 1 1.1 课题研究的背景及意义 1 1.2 特高压线路保护研究的历史和现状 2 1.2.1 纵联差动保护 2 1.2.2 行波保护 4 1.2.3 自适应保护 5 1.2.4 人工智能保护 5 1.3 存在的问题 5 1.4 本文研究的主要工作 6 2 线路分布参数电路模型的研究 8 2.1 现有线路模型 8 2.1.1 集中参数线路模型 8 2.1.2 现有分布参数线路模型 9 2.2 现有线路模型的不足 16 2.3 线路分布参数电路模型的推导和完善 16 2.4 多相线路的模量分析理论 23 2.4.1 对称分量变换 23 2.4.2 时域下的模变换矩阵 24 2.5 本章小结 25 3 分布参数电路模型的仿真验证及对比分析 26 3.1 仿真技术简介 26 3.2 单相分布参数电路