湖南大学学报（自然科学版）2024，Vol.51Issue(2)：33-44,12.DOI:10.16339/j.cnki.hdxbzkb.2024224
一种适用于混合双极直流输电的纵联方向保护方法
A Pilot Directional Protection Method for Hybrid Bipolar DC Transmission
摘要
Abstract
DC transmission lines usually take large inductance and DC filters as the boundary.When a fault traveling wave undergoes refraction and reflection at the boundary,its traveling wave energy will also be absorbed due to the inductance and DC filters,resulting in the difference of high-frequency traveling wave energy within and outside the region.When the positive direction fault occurs,the energy of the high-frequency forward traveling wave is less than that of the high-frequency backward traveling wave.When the opposite direction fault occurs,the energy of the high-frequency forward traveling wave is greater than that of the high-frequency backward traveling wave.Based on this feature,a pilot directional protection based on the difference of high-frequency energy of forward and backward traveling waves is proposed that uses the wavelet packet transform algorithm to extract the high-frequency energy of the traveling wave,and uses the difference of the high-frequency energy of the forward and backward traveling waves to distinguish the faults inside and outside the area.The simulation results show that the protection can quickly and accurately identify faults,and is not affected by fault type,transition resistance,fault location distance,and noises.It has certain practicability.关键词
行波保护/混合直流输电/高频行波能量/小波包变换/纵联方向保护Key words
traveling wave protection/hybrid DC transmission/high frequency traveling wave energy/wavelet packet transform/pilot directional protection分类
动力与电气工程引用本文复制引用
高淑萍,李元泽,宋国兵,左俊杰,吕宇星,沈渠旺..一种适用于混合双极直流输电的纵联方向保护方法[J].湖南大学学报（自然科学版）,2024,51(2):33-44,12.基金项目
国家自然科学基金资助项目(51777166),National Natural Science Foundation of China(51777166) （51777166）
国家自然科学基金国际合作与交流项目(52061635105),National Natural Science Foundation of China(NSFC-UKRI_EPSRC)(52061635105) （52061635105）
国家电网有限公司总部科技项目(52094020006U),Science and Technology Project of State Grid Corporation of China(52094020006U) （52094020006U）
