| 引用本文: | 陈晓龙,余联课,裴东锋,等.一种基于故障支路判定和迭代计算的单回T型输电线路
故障测距新方法[J].电力系统保护与控制,2022,50(20):1-11.[点击复制] |
| CHEN Xiaolong,YU Lianke,PEI Dongfeng,et al.A new fault location method for single-circuit three-terminal transmission lines based onfault branch determination and iterative calculation[J].Power System Protection and Control,2022,50(20):1-11[点击复制] |
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| 摘要: |
| 针对单回T型输电线路，根据其在故障情况下的正序网络提出了一种基于集中参数模型的故障测距新方法。该方法包括故障支路判定和故障测距两部分。在故障支路判定阶段，为简化故障支路判定函数，在不考虑线路对地电容作用的情况下，推导并设计了故障支路判定函数，根据该函数在各支路首末端函数值是否异号的特征，即可实现故障支路判定。另外，为保证支路首端附近和T节点附近发生故障时故障支路判定的准确性，给出了故障支路判据。在故障测距阶段，为保证测距精度，计及了输电线路对地电容作用，给出了基于正序分量和正序故障分量的故障距离解析表达式，根据该表达式只需数次迭代即可求解出故障距离。所提方法适用于各种故障类型，在T节点附近发生高阻故障时故障支路判别不存在死区，且计算量小、易于编程实现。理论分析和仿真测试表明，该方法的有效性和准确性不受故障位置、过渡电阻以及T接位置等因素的影响。 |
| 关键词: T型输电线路 故障支路判定 故障测距 迭代计算 |
| DOI：DOI:?10.19783/j.cnki.pspc.226430 |
| 投稿时间：2021-12-02修订日期：2022-05-24 |
| 基金项目:国家自然科学基金委员会-国家电网公司智能电网联合基金项目资助(U2066210)；国网河北省电力有限公司科技项目资助-高压输电线路故障先兆诊断与智慧处置技术研究(kj2021-042) |
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| A new fault location method for single-circuit three-terminal transmission lines based onfault branch determination and iterative calculation |
| CHEN Xiaolong,YU Lianke,PEI Dongfeng,YUAN Shu,XUE Shuguang,JIANG Yanfeng,LI Shuwang |
| (1. Key Laboratory of Smart Grid of Ministry of Education (Tianjin University), Tianjin 300072, China;
2. Handan Power Supply Branch, State Grid Hebei Electric Power Co., Ltd., Handan 056000, China) |
| Abstract: |
| From the positive-sequence network, a new fault location method based on a lumped parameter model is proposed for single-circuit three-terminal transmission lines. This method includes two stages, including fault branch determination and fault position calculation. At the fault branch determination stage, the fault branch determination function is deduced and designed without considering the line-to-ground capacitance – this to simplify this function. From the opposite signs between the function values at both ends of each branch, the fault branch can be determined. In addition, to ensure the accuracy of fault branch determination when faults occur near the branch head-end and T-node, the fault branch criterion is also given. At the fault position calculation stage, the effect of the line-to-ground capacitance is considered to ensure the accuracy of the calculation. Then, an analytical expression of fault distance is given based on positive-sequence component and positive-sequence fault component. Based on this expression, the fault distance can be solved by only several iterations. The proposed method is applicable to various types of faults, and it is suitable for high-resistance faults near the T-node without dead zone. Moreover, the method has low computational overhead, which makes it easy for programming. Theoretical analysis and simulation tests show that the effectiveness and accuracy of the proposed method are not affected by fault location, transition resistance or T-junction position.
This work is supported by the Joint Project of Commission of National Natural Science Foundation of China-Smart Grid of State Grid Corporation of China (No. U2066210). |
| Key words: three-terminal transmission lines fault branch determination fault location iterative computation |
