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华北电力大学电气与电子工程学院,河北省保定市 071003
戴志辉(1980—),男,通信作者,博士,教授,博士生导师,主要研究方向:电力系统保护与控制。E-mail:daihuadian@163.com
秦昊宇(1998—),男,硕士研究生,主要研究方向:电力系统保护与控制。E-mail:1636565080@qq.com
李杭泽(1999—),男,硕士研究生,主要研究方向:电力系统保护与控制。E-mail:925449790@qq.com
收稿日期:2022-08-26,
修回日期:2023-02-18,
网络出版日期:2023-04-25,
纸质出版日期:2023-06-10
移动端阅览
戴志辉,秦昊宇,李杭泽等.基于反射系数和模型匹配的柔性直流电网单端量线路保护[J].电力系统自动化,2023,47(11):101-109.
DAI Zhihui,QIN Haoyu,LI Hangze,et al.Single-end Line Protection Based on Reflection Coefficient and Model Matching in Flexible DC Power Grid[J].Automation of Electric Power Systems,2023,47(11):101-109.
戴志辉,秦昊宇,李杭泽等.基于反射系数和模型匹配的柔性直流电网单端量线路保护[J].电力系统自动化,2023,47(11):101-109. DOI: 10.7500/AEPS20220826008.
DAI Zhihui,QIN Haoyu,LI Hangze,et al.Single-end Line Protection Based on Reflection Coefficient and Model Matching in Flexible DC Power Grid[J].Automation of Electric Power Systems,2023,47(11):101-109. DOI: 10.7500/AEPS20220826008.
针对柔性直流电网线路保护区内远端高阻故障拒动、雷击干扰误动的问题,提出一种基于反射系数和模型匹配的单端量线路保护。首先,根据电压行波反射系数构成方向判据,避免反方向故障或雷击下保护误动;其次,利用电压行波传递函数解析区内短路故障,以及正方向区外故障或正方向雷击下保护处故障电压首行波满足的函数模型,根据故障首行波与基准函数模型之间匹配程度的不同,设计了一种基于模型匹配的识别判据;然后,结合启动判据和选极判据形成完整的单端量线路保护方案;最后,PSCAD仿真结果验证了所提保护方案可靠性高,能耐受500 Ω过渡电阻和20 dB噪声。
A single-end line protection based on reflection coefficient and model matching is proposed to address the issues of internal remote high-resistance fault rejection and lightning interference misoperation of line protection in flexible DC power grid. First
based on the reflection coefficient of voltage traveling waves
a directional criterion is constructed to avoid protection misoperation under backward faults or lightning stroke. Secondly
using the voltage traveling wave transfer function to analyze internal short-circuit faults
as well as the function model satisfied by the initial traveling wave of fault voltage at the protection point under forward external faults or forward lightning strikes
a recognition criterion based on model matching is designed according to the different matching degrees between the first traveling wave of fault and the reference function model. Then
a complete single-end line protection scheme is constructed by combining the starting criterion and pole-selection criterion. Finally
the PSCAD simulation results verify that the proposed protection scheme has high reliability and can withstand 500 Ω transition resistance and 20 dB noise
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