| 引用本文: | 李召兄,吴丽,吴兴全,等.含光伏电站的并网系统线路故障测距研究[J].电力系统保护与控制,2018,46(22):104-108.[点击复制] |
| LI Zhaoxiong,WU Li,WU Xingquan,et al.Line fault location of the grid-connected system with photovoltaic plant[J].Power System Protection and Control,2018,46(22):104-108[点击复制] |
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| 摘要: |
| 含有基于正序控制的光伏电站并网系统在发生单相短路故障时，对光伏电站外部和内部故障两种情形分别进行研究，提出了各自适应的故障测距算法。针对光伏电站外部故障，仅利用光伏电站对端系统的电气量信息，推导出了故障距离的解析表达式，该方法不受对端系统阻抗变化的影响。对于光伏电站内部汇集线路故障，利用双端系统的电气量信息，推导出故障距离的解析表达式，不存在伪根问题，计算量小，无需搜索和迭代，鲁棒性强。MATLAB仿真结果表明，在光伏电站外部和内部故障两种情况下，所提方法均能够有效定位故障点，且不受过渡电阻的影响，测距精度高。 |
| 关键词: 故障测距 正序控制 光伏电站 汇集线路 过渡电阻 |
| DOI：10.7667/PSPC171561 |
| 投稿时间：2017-10-23修订日期：2017-12-18 |
| 基金项目:国家自然科学基金面上项目资助(51577018);中国能源建设集团甘肃省电力设计院有限公司科技项目资助(G-2015-11-18-01);高等学校学科创新引智计划(“111”计划)资助项目(B08036) |
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| Line fault location of the grid-connected system with photovoltaic plant |
| LI Zhaoxiong,WU Li,WU Xingquan,LI Zheng,ZENG Yanting,LU Jiping |
| (China Energy Engineering Corporation Limited Gansu Electric Power Design Institute, Lanzhou 730050, China;State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China) |
| Abstract: |
| Aiming at the single-phase grounding short-circuit fault of photovoltaic grid-connected station based on positive-sequence control, this paper studies internal faults and external faults of photovoltaic plant respectively and proposes their adaptive fault location algorithms. For the external fault of the photovoltaic plant, this method only uses the electrical information of the opposite end system of the photovoltaic plant to get the analytical expression of the fault distance, which is not affected by the impedance change of the opposite end system. For the internal faults on the collector line of a photovoltaic plant, it uses the electrical information of the systems at both ends to obtain an analytical expression of the fault distance. The method has the advantage of no false roots and no need to search and iterate, and the calculation amount is small and the robustness is strong. The simulation results of MATLAB show that the proposed method can effectively locate the fault point in the two cases of external and internal faults of the PV power plant, is not affected by the transition resistance, and the ranging accuracy is high. This work is supported by National Natural Science Foundation of China (No. 51577018). |
| Key words: fault location positive sequence control photovoltaic plant collector line transition resistance |
