不同接地方式下无变压器型SNOP的交流故障特性分析
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摘要
无变压器的SNOP(智能软开关)能够有效减少占地面积和投资成本,紧凑化的方式更加适用于负荷较为密集的城市区域。首先在PSCAD/EMTDC内建立了一个含无变压器型SNOP的两供区仿真模型,通过对供区内经消弧线圈接地、小电阻接地、直接接地3种接地方式的组合仿真,统计分析了SNOP在无变压器情况下零序分量的相关特性。利用电路分析和序分量分解的方式,分析了无变压器情况下故障侧零序分量引发直流电压和非故障侧交流电压波动的内在机理,阐释了仿真统计结果。研究结论可为相关工程和研究人员提供技术参考。
The transformerless SNOP can effectively reduce the footprint and the investment cost. The compact design is more suitable for urban areas with the intensive load. In the PSCAD/EMTDC, a simulation model containing two supply zones embedded in a transformerless SNOP is built. Through the combination simulation of three grounding modes: the arc suppression coil grounding, the small resistance grounding and the direct grounding, the characteristics of the zero-sequence component of SNOP in the transformerless condition are analyzed statistically. By means of circuit analysis and sequence component decomposition, the intrinsic mechanism of DC voltage fluctuation and AC voltage fluctuation in the non-fault side caused by the zero-sequence component at the fault side is analyzed, and the simulation results are explained. The conclusions of this paper provide technical reference for related engineers and researchers.
The transformerless SNOP can effectively reduce the footprint and the investment cost. The compact design is more suitable for urban areas with the intensive load. In the PSCAD/EMTDC, a simulation model containing two supply zones embedded in a transformerless SNOP is built. Through the combination simulation of three grounding modes: the arc suppression coil grounding, the small resistance grounding and the direct grounding, the characteristics of the zero-sequence component of SNOP in the transformerless condition are analyzed statistically. By means of circuit analysis and sequence component decomposition, the intrinsic mechanism of DC voltage fluctuation and AC voltage fluctuation in the non-fault side caused by the zero-sequence component at the fault side is analyzed, and the simulation results are explained. The conclusions of this paper provide technical reference for related engineers and researchers.
引文
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[5]李智诚,吴建中,和敬涵,等.软常开点的双闭环控制及其在配电网中的应用[J].智能电网,2013,1(1):49-55.
[6]姜田贵,谢晔源,李洪涛,等.中性点经消弧线圈接地系统中柔性环网控制装置接地故障分析[J].电力建设,2016,37(5):146-152.
[7]高凯,阳岳希,张艳军,等.适用于城市电网的柔性环网控制器拓扑方案研究[J].电网技术,2016,40(1):78-85.
[8]张艳军,周季,高凯,等.柔性环网控制器原理及紧凑化研究[J].智能电网,2017,5(5):434-441.
[9]尹昌新,李蕴,陈平,等.分区互联装置桥臂闪络故障保护策略设计[J].电力建设,2017,38(2):100-105.
[10]王辉.10 kV配电网中性点接地方式的研究[D].天津:天津大学,2007.
[11]侯义明,于辉,王喜伟.交流配电系统的接地方式及过电压保护[M].北京:中国电力出版社,2015.
[12]苏继锋.配电网中性点接地方式研究[J].电力系统保护与控制,2013,41(8):141-148.
[13]薛永端,郭丽伟,张林利,等.有源配电网中性点接地方式的选择问题[J].电力系统自动化,2015,39(13):129-136.
[14]蒋心泽,徐永生.中性点经小电阻接地系统接地保护方案探讨[J].上海电力学院学报,1998,14(2):6-11.
[15]徐政,屠卿瑞,管敏渊,等.柔性直流输电系统[M].北京:机械工业出版社,2013.