半月刊

ISSN 1000-1026

CN 32-1180/TP

+高级检索 English
基于故障高频电压稀疏量测的直流配电网双极短路故障定位
作者:
作者单位:

新能源电力系统国家重点实验室,华北电力大学,北京市 102206

作者简介:

贾科(1986—),男,通信作者,博士,副教授,主要研究方向:配电网保护和故障定位。E-mail:ke.jia@ncepu.edu.cn
冯涛(1993—),男,硕士研究生,主要研究方向:柔性直流配电网保护。E-mail:ft940130@163.com
赵其娟(1994—),女,硕士研究生,主要研究方向:柔性直流配电网保护。E-mail:zhaoqijuanzqj@163.com

通讯作者:

基金项目:

国家重点研发计划资助项目(2018YFB0904100);国家电网公司科技项目(SGHB0000KXJS1800685)。


Bipolar Short-circuit Fault Location for DC Distribution Network Based on Sparse Measurement of Fault High-frequency Voltage
Author:
Affiliation:

State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University, Beijing 102206, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2018YFB0904100) and State Grid Corpration of China (No. SGHB0000KXJS1800685).

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
    摘要:

    直流配电网分支密集,支持数据高速通信的测点相对较少,同时故障特性受配电网中电力电子设备控制策略的影响较大,导致传统配电网的故障定位方法难以适用于直流配电网。基于此,文中提出一种适用于直流配电网的双极短路故障定位新算法。基于暂态高频电流回路构建了不受控制策略影响的模块化多电平换流器和DC/DC换流器高频阻抗等值模型,然后,利用小波变换提取稀疏测点处的暂态高频电压形成节点高频电压方程。最后,将节点高频电压方程与基于贝叶斯算法的压缩感知理论相结合,求解节点高频电流稀疏向量,实现基于稀疏量测的准确故障定位。所提算法对测点数量要求低,同时不受换流器控制策略的影响,无需数据严格同步测量,理论上不受过渡电阻和负荷变化的影响。在PSCAD中搭建32节点直流配电网的仿真模型,测试数据验证了所提算法的定位效果。

    Abstract:

    DC distribution networks have many intensive branches and few measuring points that support data high-speed communication. Meanwhile, the fault characteristics are greatly affected by the control strategy of power electronic equipment, which makes the fault location method of the traditional distribution network difficult to be applied to DC distribution network. Based on this, the paper proposes a new bipolar short-circuit fault location algorithm for DC distribution networks. According to the transient high-frequency current loop, the high-frequency impedance equivalent models of modular multilevel converter and DC/DC converter not affected by the control strategy are constructed. Then, the wavelet transform is used to extract the fault high-frequency voltage of the sparse measurement point, which is used to form the node high-frequency voltage equation. Finally, combining the equation with the Bayesian algorithm based compressed sensing theory, the node high-frequency current sparse vector is solved and fault location is achieved accurately based on sparse voltage measurement. The proposed algorithm has low requirements on the number of measuring points and is not affected by the control strategy of converters. It does not need strict data synchronization measurement and is not theoretically affected by the transition resistance. The simulation model of the 32-node DC distribution network is built in PSCAD and the location effectiveness of the proposed algorithm is verified by the test data.

    表 3 含过渡电阻定位结果分析Table 3 Analysis of location results
    表 2 含噪声定位结果分析Table 2 Analysis of location results with noise
    表 5 线路参数变化定位结果分析Table 5 Analysis of location results when lineparameters change
    表 4 负荷变化定位结果分析Table 4 Analysis of location results withload changing
    图1 MMC高频阻抗模型Fig.1 High-frequency impedance model of MMC
    图2 DC/DC换流器高频阻抗模型Fig.2 High frequency impedance model
    图3 不同控制策略下MMC高频阻抗等值模型仿真验证Fig.3 Simulation verification of high frequency impedance model for MMC with different
    图4 不同控制策略下DC/DC换流器高频阻抗等值模型仿真验证Fig.4 Simulation verification of high frequencyimpedance model for DC/DC converter withdifferent control strategies
    图5 节点13故障定位结果示意图Fig.5 Schematic diagram of fault location
    图6 支路13故障定位结果示意图Fig.6 Schematic diagram of fault location
    表 1 含分布电容的定位结果分析Table 1 Analysis of location results with distributed capacitance
    参考文献
    相似文献
    引证文献
引用本文

贾科,冯涛,赵其娟,等.基于故障高频电压稀疏量测的直流配电网双极短路故障定位[J].电力系统自动化,2020,44(1):142-151. DOI:10.7500/AEPS20190121003.
JIA Ke,FENG Tao,ZHAO Qijuan,et al.Bipolar Short-circuit Fault Location for DC Distribution Network Based on Sparse Measurement of Fault High-frequency Voltage[J].Automation of Electric Power Systems,2020,44(1):142-151. DOI:10.7500/AEPS20190121003.

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2019-01-21
  • 最后修改日期:2019-06-10
  • 录用日期:
  • 在线发布日期: 2020-01-04
  • 出版日期: