特高压直流输电线路雷击暂态过程与行波保护响应特性分析

发布时间：2018-03-10 04:17

本文选题：特高压直流系统　切入点：雷击暂态过程　出处：《电网技术》2015年10期 　论文类型：期刊论文

【摘要】：针对实际工程中特高压直流输电线路雷击事件,采用电磁暂态仿真软件PSCAD/EMTDC实现雷击特高压线路的小步长仿真,解决了目前仿真方法未能与保护分析工作相适应的问题。主要分析了发生非故障性绕击、故障性绕击以及反击时保护安装处电压、电流的暂态过程,描述各电气暂态量在雷击极与非雷击极的主要特征及区别。结合实际行波保护模型的动作情况,对比非故障性绕击、故障性绕击以及反击下d U/dt判据、DU判据、DI判据在雷击极与非雷击极的响应结果,梳理雷击特高压直流输电线路行波保护判据的响应特性,指出在故障性绕击、反击场景下非雷击极行波保护误动情况是由于线路耦合导致在雷电流波头上升阶段出现非雷击极保护的DU、DI判据满足整定值造成的。最后给出了提高特高压直流系统行波保护雷击可靠性的优化思路。
[Abstract]:Aiming at lightning stroke events of UHVDC transmission lines in actual engineering, the electromagnetic transient simulation software PSCAD/EMTDC is used to realize the small step size simulation of UHV lines. This paper solves the problem that the current simulation method can not adapt to the protection analysis work. The transient process of the voltage and current in the protection installation is mainly analyzed. This paper describes the main characteristics and differences of the electric transient values between the lightning stroke pole and the non-lightning stroke pole. Combined with the operation of the actual traveling wave protection model, the non-fault wound failure is compared. The response results of DU criterion and DU criterion in lightning stroke and non-lightning strike are analyzed, and the response characteristics of traveling wave protection criterion for UHVDC transmission line are analyzed. The misoperation of non-lightning pole traveling wave protection in counterattack scene is caused by the DUGDI criterion of non-lightning pole protection which occurs during the rising stage of lightning current wave head due to line coupling. Finally, the improvement of UHV DC system is given. Optimization of Lightning strike Reliability of traveling Wave Protection system.
【作者单位】：中国南方电网科学研究院有限责任公司;华南理工大学电力学院;
【分类号】：TM863

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