基于电流行波的微电网保护策略

针对微电网的故障电流小、潮流双向性等特性,提出了适合微电网的保护策略并进行了仿真。传统的基于过电流的电网保护技术对于微电网的保护受到一定限制,因而需要对新的技术进行探索。在对这些因素分析的基础上,提出了微电网的保护策略：通过小波变换对电流行波进行分析判断故障位置,母线电压确定故障发生与否及扰动电压判断故障类型。利用SVPWM控制原理在Matlab/Simulink中使用SimPowerSystems搭建微电网的模型,并对孤岛运行模式下微电网不同的故障类型进行仿真分析,仿真结果表明所提出的保护策略在孤岛运行的方式下是有效的。...

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Bibliographic Details
Published in电力系统保护与控制 Vol. 42; no. 18; pp. 94 - 100
Main Author 李练兵 张晓娜 张家安 孙鲁滨
Format Journal Article
LanguageChinese
Published 河北工业大学控制科学与工程学院,天津,300130 2014
Subjects
DG
SVPWM
小波变换
微电网保护
故障特性
电流行波
电流行波
failure characteristics
小波变换
DG
wavelet transform
故障特性
SVPWM
current traveling wave
微电网保护
microgrid protection
Online AccessGet full text
ISSN1674-3415

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Summary:针对微电网的故障电流小、潮流双向性等特性,提出了适合微电网的保护策略并进行了仿真。传统的基于过电流的电网保护技术对于微电网的保护受到一定限制,因而需要对新的技术进行探索。在对这些因素分析的基础上,提出了微电网的保护策略：通过小波变换对电流行波进行分析判断故障位置,母线电压确定故障发生与否及扰动电压判断故障类型。利用SVPWM控制原理在Matlab/Simulink中使用SimPowerSystems搭建微电网的模型,并对孤岛运行模式下微电网不同的故障类型进行仿真分析,仿真结果表明所提出的保护策略在孤岛运行的方式下是有效的。
Bibliography:Based on the characteristics of microgrid, for example small fault current, the bidirectional powerflow, etc, a protection scheme is proposed and simulated. The traditional protection scheme based on overcurrent has some restrictions on the microgrid protection, thus a novel protection needs to be explored. Based on the analysis of the above factors, a microgrid protection scheme is proposed. Wavelet transform is used in analyzing current traveling waves to identify faulted location, the bus bar voltages are used to determine whether a fault happened or not, and disturbance voltages are used to determine fault types. A microgrid model is established using SVPWM with SimPowerSystems in Matlab/Simulink, and different faults in the islanded microgrid are simulated, and the result shows that the proposed protection is valid in an islanded operating mode.
41-1401/TM
LI Lian-bing, ZHANG Xiao-na, ZHANG Jia-an, SUN Lu-bin （Control Science and Engineering, Hebei University of Technology, Tianjin 300130, China）
DG; microg
ISSN:1674-3415