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西南交通大学电气工程学院,四川省成都市 611756
魏来(1998—),男,硕士研究生,主要研究方向:直流配电网保护与控制。E-mail:Wei9889lai@126.com
李波(1996—),男,博士研究生,主要研究方向:交直流配电网保护与控制。E-mail:libo186@foxmail.com
廖凯(1989—),男,通信作者,博士,副教授,主要研究方向:城市电网保护与控制、交通能源融合。E-mail:liaokai_lk@hotmail.com
收稿:2022-11-03,
修回:2023-03-20,
网络出版:2023-10-23,
纸质出版:2023-11-25
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魏来,李波,廖凯等.基于改进Jaccard系数的柔性直流配电网纵联保护方案[J].电力系统自动化,2023,47(22):75-86.
WEI Lai,LI Bo,LIAO Kai,et al.Pilot Protection Scheme for Flexible DC Distribution Network Based on Improved Jaccard Coefficient[J].Automation of Electric Power Systems,2023,47(22):75-86.
魏来,李波,廖凯等.基于改进Jaccard系数的柔性直流配电网纵联保护方案[J].电力系统自动化,2023,47(22):75-86. DOI: 10.7500/AEPS20221103004.
WEI Lai,LI Bo,LIAO Kai,et al.Pilot Protection Scheme for Flexible DC Distribution Network Based on Improved Jaccard Coefficient[J].Automation of Electric Power Systems,2023,47(22):75-86. DOI: 10.7500/AEPS20221103004.
纵联保护具有高选择性的优势,是柔性直流配电网主要保护类型之一。然而,纵联保护对双端数据要求较高,存在可用数据有限、易受同步误差影响等问题。为此,文中提出了一种基于改进Jaccard系数的柔性直流配电网纵联保护方案,以提高数据可用率、降低对信息同步的要求。首先,通过推导区内、区外故障时两端故障电流表达式,得到两端电流绝对值交集部分的特征差异。其次,采用简化的Apollo曲线光滑算法进行预处理,利用两端电流绝对值的改进Jaccard系数量化交集特征差异,构建了保护动作判据。最后,基于PSCAD/EMTDC搭建四端环状直流配电网模型进行了仿真验证。仿真结果表明,所提纵联保护方案能够可靠判别区内、外故障,且具有较高的耐受过渡电阻、抗噪声干扰和抗同步误差能力。
The pilot protection has the advantage of high selectivity
which is one of the main protection types for the flexible DC distribution network. However
the pilot protection requires high-quality data from both ends
so there are some problems such as limited available data and susceptible to synchronization errors. In this paper
a pilot protection scheme based on the improved Jaccard coefficient for flexible DC distribution networks is proposed to improve data availability and reduce the need for information synchronization. Firstly
by deriving the expressions of fault currents at both ends with the internal and external faults
the characteristic differences of the intersection part of the absolute values of the currents at both ends are derived. Secondly
a simplified Apollo curve smoothing algorithm is used for pre-processing. The difference in intersection characteristics is quantified by using the improved Jaccard coefficients of absolute values of currents at both ends
and the protection action criterion is constructed. Finally
a four-terminal annular DC distribution network is built based on PSCAD/EMTDC for simulation and verification. The simulation results show that the proposed pilot protection scheme can reliably discriminate internal and external faults and has high resistance to transition resistance
noise interference and synchronization error.
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