考虑系统振荡的具备识别潮流转移能力的广域后备保护研究  

Wide Area Backup Protection Scheme with Capability of Identifying Power Flow Transfer and Consideration of Power System Oscillation

作　　者：徐岩[1] 韩平[1] 

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,河北保定071003

出　　处：《华北电力大学学报（自然科学版）》2016年第2期30-37,61,共9页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家自然科学基金资助项目(50777016)

摘　　要：为有效预防距离Ⅲ段后备保护因潮流转移引起误动冲击电网,避免连锁跳闸事故的发生,基于PMU量测信息提出了一种具备识别潮流转移能力的广域后备保护方案。该方案充分考虑了系统振荡过程,引入了能反映潮流转移与各类型短路故障的明显差别的潮流转移识别特征量(Flow transfer identification characteristic,FTIC)的概念,详细地推导了系统功角从0°到180°变化的过程中分别发生潮流转移与各类短路故障时FTIC的不同取值范围,并以此为依据设置识别判据、整定识别延时,详细阐述了方案的实施流程。该方案能够实现无论系统振荡与否,发生潮流转移时及时闭锁距离Ⅲ段后备保护,并保证发生短路故障时使距离Ⅲ段元件继续开放。通过IEEE10机系统的仿真算例验证了所提方案的可行性和有效性。In order to prevent the possible incorrect operation of zone 3 distance protection from power flow transfer to deteriorate the grid and the occurrence of cascading trips, a wide area backup protection scheme capable to identify power flow transfer is proposed, in which the process of power system oscillation is fully considered. A new concept of flow transfer identification characteristic （FTIC） that can show the significant differences between power flow transfer and short-circuit fault is introduced, and the ranges of FTIC when power flow transfer or short-circuit fault occurs with power angle changing from 0 degree to 180 degree are concluded respectively. Then the identification criteria and delay time are set on the basis of the conclusion and the implementation flowchart is stated in detail. Through the proposed scheme, zone 3 distance protection will be blocked in time when power flow transfer occurs, and its permission to trip when there is an internal fault is guaranteed. The feasibility and effectiveness of the backup protection scheme are veri- fied by simulation results of IEEE 10 - machine test system.

关 键 词：误动作 距离Ⅲ段保护 潮流转移识别特征量 系统振荡 广域后备保护 

分 类 号：TM77[电气工程—电力系统及自动化]