| 引用本文: | 李祺平,李保宏,张英敏,等.考虑大规模多类型馈入源的配电网三相短路故障稳态电流实用计算方法[J].电力系统保护与控制,2025,53(20):11-22. |
| LI Qiping,LI Baohong,ZHANG Yingmin,et al.A practical method for steady-state current calculation of three-phase short-circuit faults in distribution networks considering large-scale multi-type feeding sources[J].Power System Protection and Control,2025,53(20):11-22 |
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| 摘要: |
| 随着大规模新能源场站和感应电动机等馈入源接入配电网，其对配电网短路电流特性的影响日益显著。现有的短路电流计算方法难以准确反映二者共同作用下的短路电流特性，因此提出了一种大规模多类型馈入源的配电网三相短路故障稳态电流计算方法。该方法首先对故障期间感应电动机馈入的三相短路电流进行波形拟合，进而建立配电网详细模型与等值模型之间的等效关系。其次通过仿真验证表明等值模型在稳态和暂态特性上与详细模型具有较高的一致性。最后在新能源场站和感应电动机大规模接入配电网的情况下，将新能源场站与配电网等值模型统一等效为压控电流源来计算三相短路故障稳态电流。仿真结果表明，该方法具有较高的计算精度和工程实用性。 |
| 关键词: 新能源场站 感应电动机 波形拟合 压控电流源 故障稳态电流 |
| DOI：10.19783/j.cnki.pspc.241715 |
| 分类号: |
| 基金项目:四川省自然科学基金项目资助(2025NSFSC2037) |
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| A practical method for steady-state current calculation of three-phase short-circuit faults in distribution networks considering large-scale multi-type feeding sources |
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LI Qiping1, LI Baohong1, ZHANG Yingmin1, JIANG Qin1, WANG Xi2, CHEN Liang3
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1. College of Electrical Engineering, Sichuan University, Chengdu 610065, China; 2. Electric Power Science Research
Institute, State Grid Sichuan Electric Power Company, Chengdu 610095, China; 3. Meishan Power Supply Company,
State Grid Sichuan Electric Power Company, Meishan 610058, China
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| Abstract: |
| With the large-scale integration of new energy stations and induction motors into distribution networks, their impact on the short-circuit current characteristics of the network has become increasingly significant. Existing short-circuit current calculation methods are difficult to accurately reflect the combined effects of these diverse feeding sources. Therefore, this paper proposes a steady-state current calculation method for three-phase short-circuit faults in distribution networks with large-scale multi-type feeding sources. First, the waveform of the three-phase short-circuit current fed by induction motors during faults is fitted through waveform modelling, and an equivalent relationship is established between a detailed distribution network model and its equivalent model. Then, simulation results verify that the equivalent model has high consistency with the detailed model in both steady-state and transient characteristics. Finally, under conditions of large-scale integration of new energy stations and induction motors, the equivalent models of new energy stations and distribution networks are jointly represented as voltage-controlled current sources for calculating the steady-state current of three-phase short-circuit faults. Simulation results show that the proposed method has high computational accuracy and strong engineering practicality. |
| Key words: new energy station induction motor waveform fitting voltage-controlled current source fault steady-state current |
