摘要
在风电柔性直流电网中,交流故障的快速定位和穿越是需要解决的主要问题之一。该文首先分析直流电网下不同位置及不同性质交流故障的暂态特性,提出一种新型的暂态能量转移指标——潮流转移熵。基于潮流转移熵对不同交流故障的敏感性,提出异地交流故障检测与定位方法,设计无需远距离通讯的源侧暂态能量耗散策略。进而提出故障性质判定方法,并针对永久性交流故障设计风电场和耗能电阻的协调配合控制策略。最后通过PSCAD仿真验证提出的故障诊断和穿越方法的有效性,在该方法下,系统能够在任何受端发生瞬时性或永久性交流故障均实现不间断运行。
In the HVDC wind power integration grid,rapid location and ride-through of AC faults is one of the main problems to be solved.This paper first analyzed the transient characteristics of AC faults at different locations and with different properties in the HVDC grid,and proposed a novel criterion of transient energy transfer index,i.e.power flow entropy.Based on the sensitivity of power flow transfer entropy to different AC faults,a method for off-site detecting and locating AC faults was proposed,and a source-side transient energy dissipation strategy was designed without long-distance communication.Furthermore,a method for discriminating permanent faults was proposed,and a coordinated control strategy of the wind farm and dissipation resistors was designed.Finally,the effectiveness of the proposed fault diagnosis and ride-through method was verified by PSCAD simulations.Under this method,the system can achieve uninterrupted operation in any transient or permanent AC fault in receiving terminals.
作者
曹帅
向往
左文平
张欣
文劲宇
CAO Shuai;XIANG Wang;ZUO Wenping;ZHNAG Xin;WEN Jinyu(State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei Province,China;The Department of Electronic and Electrical Engineering,University of Strathclyde,Glasgow G11XW,UK;Energy Research Institute@NTU,School of Electrical and Electronic Engineering,Nanyang Technological University,Singapore 639798,Singapore)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2021年第4期1295-1306,共12页
Proceedings of the CSEE
基金
国家重点研发计划项目(2018YFB0904600)。
关键词
潮流转移熵
柔性直流电网
交流故障定位
交流故障性质判定
不间断运行
power flow transfer entropy(PFTE)
HVDC grid
AC fault location
AC fault property identification
uninterrupted operation
