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基于SVG两相电流注入的配电网单相接地故障消弧方法
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1. 重庆大学电气工程学院, 重庆市 400044; 2. 云南电力试验研究院(集团)有限公司, 云南省昆明市 650217;3. 广州智光电气股份有限公司, 广东省广州市 510700

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Single-phase-to-ground Fault Arc-extinguishing Method for Distribution Network Based on SVG Two-phase Current Injection
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Affiliation:

1. School of Electrical Engineering, Chongqing University, Chongqing 400044, China; 2. Yunnan Electric Power Research Institute(Group)Co. Ltd., Kunming 650217, China; 3. Guangzhou Zhiguang Electric Co. Ltd., Guangzhou 510700, China

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    摘要:

    针对中压配电网单相接地故障,研究了基于级联H桥静止无功发生器(SVG)两相电流注入的有源消弧方法。当配电网正常运行时,SVG工作于无功补偿模式;当配电网发生单相接地故障时,SVG中性点接地,SVG两个非接地相桥臂向配电网中注入消弧补偿电流,从而减小接地点的故障电流,通过复用已有的SVG设备,替代了传统的消弧线圈。文中讨论了SVG消弧电流注入方式与SVG直流侧电压平衡控制之间的关系,并详细分析了SVG两相电流注入消弧的工作模式和消弧控制器的设计方法。基于MATLAB/Simulink环境的10 kV仿真平台以及380 V三相四级联的低压SVG样机进行仿真和实验验证,仿真和实验结果验证了所提方法的正确性和可行性。

    Abstract:

    According to the single phase-to-ground fault in the medium-voltage distribution networks, a two-phase current injection method based on the cascaded H-bridge static var generator(SVG)is studied. When the distribution network is operating normally, the SVG works in the reactive compensation mode. When single-phase-to-ground fault occurs, the neutral point of SVG is grounded and the arc suppression currents are injected into the distribution network from the other two non-grounded phases bridge of SVG, so that the fault current at the grounded point is reduced, and the traditional arc suppression coil is replaced by reusing the existing SVG equipment. This paper discusses the relationship between current injection method of SVG arc suppression and the voltage balance control of SVG DC side and the working mode of two-phase current injection of SVG arc suppression and the design method of arc suppression controller are analyzed in detail. Then, its operation mode and the controller design process are discussed in detail. A 10 kV simulation model based on MATLAB/Simulink and an experimental prototype with 380 V three-phase four-cascade low-voltage SVG are constructed for simulation and experimental verification. The simulation and experimental results verify the correctness and feasibility of the proposed scheme.

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周兴达,陆帅,陈杨明,等.基于SVG两相电流注入的配电网单相接地故障消弧方法[J].电力系统自动化,2019,43(10):142-149. DOI:10.7500/AEPS20180811005.
ZHOU Xingda, LU shuai, CHEN Yangming,et al.Single-phase-to-ground Fault Arc-extinguishing Method for Distribution Network Based on SVG Two-phase Current Injection[J].Automation of Electric Power Systems,2019,43(10):142-149. DOI:10.7500/AEPS20180811005.

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  • 收稿日期:2018-08-11
  • 最后修改日期:2019-03-24
  • 录用日期:2019-01-25
  • 在线发布日期: 2019-03-26
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