适应屋顶光伏接入的低压配电系统故障测距新方法
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国网天津电科院

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TM76

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国家电网公司总部指南项目(4000-202122070A-0-0-00).国网天津市电力公司科技创新(KJ20-1-26).


Research on Fault Location Method for Low Voltage Four Wire Distribution System with Rooftop Photovoltaic
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State Grid Tianjin Electric Power Research Institute

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    摘要:

    随着新型电力系统的不断建设,新能源大规模接入低压配网是我国能源转型的重要方向。在电网故障条件下,快速准确确定故障位置对提升新能源利用率和改善低压配网可靠性至关重要。目前,现有故障测距研究主要针对输电网和中高配电网,但对于低压四线制配电系统相关研究较少。在大规模建设屋顶光伏的背景下,低压四线制配电网是消纳新能源的重要场景。针对此,本文面向有源低压三相四线制配电系统提出一种新型故障定位方法,首先建立三相四线制系统接地故障下故障距离计算模型和屋顶光伏故障等效模型;然后,建立了屋顶光伏故障计算模型与故障线路靠近屋顶光伏端的电压关联模型。在此基础上,联合所建立的关联模型、屋顶光伏故障等值模型,以及三相四线制系统故障距离计算模型,通过迭代计算方法求解故障距离。最后,基于仿真算例对所提算法进行了验证,结果表明该算法具有良好性能,研究成果将有效提升屋顶光伏接入后的低压配网三相四线制系统故障定位水平。

    Abstract:

    With the continuous construction of new power system, large-scale access of distributed generation to low-voltage distribution network is an important development direction of energy in China. Therefore, rapid and accurate determination of fault location under power grid fault conditions is very important to improve the utilization rate of new energy and improve the reliability of low-voltage distribution network. Then, the current fault location research mainly focuses on the transmission network and medium and high distribution network, but there is little research on the low-voltage four wire distribution system, especially the scenario of distributed generation connected to the low-voltage four wire distribution system.In view of this, this paper proposes a fault location method based on impedance ranging for four wire distribution system, and gives a detailed calculation method and its acquisition method. This method overcomes the problem that most fault location methods are difficult to apply in low-voltage distribution network. The physical concept is clear and can well meet the actual operation requirements of distribution network. Finally, the proposed algorithm is verified and the simulation results show that the algorithm has good performance. The research results of this paper will help to improve the fault location level of low-voltage four wire distribution system.

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姚瑛,季大龙,傅文进,等. 适应屋顶光伏接入的低压配电系统故障测距新方法[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-12-01
  • 最后修改日期:2022-04-24
  • 录用日期:2022-04-28
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