| 引用本文: | 李练兵,张晓娜,张家安,等.基于电流行波的微电网保护策略[J].电力系统保护与控制,2014,42(18):94-100. |
| LI Lian-bing,ZHANG Xiao-na,ZHANG Jia-an,et al.Protection scheme of microgrid based on current traveling wave[J].Power System Protection and Control,2014,42(18):94-100 |
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| 摘要: |
| 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 |
| 关键词: DG 微电网保护 故障特性 SVPWM 电流行波 小波变换 |
| DOI： |
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| Protection scheme of microgrid based on current traveling wave |
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LI Lian-bing, ZHANG Xiao-na, ZHANG Jia-an, SUN Lu-bin
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Control Science and Engineering, Hebei University of Technology, Tianjin 300130, China
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| Abstract: |
| 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. |
| Key words: DG microgrid protection failure characteristics SVPWM current traveling wave wavelet transform |
