| 引用本文: | 贾焦心,杨耀辉,贾凯旋,颜湘武,邵晨.基于叠加定理的有源配电网等值阻抗测量方法[J].电力自动化设备,2025,45(6):57-63. |
| JIA Jiaoxin,YANG Yaohui,JIA Kaixuan,YAN Xiangwu,SHAO Chen.Equivalent impedance measurement method of active distribution network based on superposition theorem[J].Electric Power Automation Equipment,2025,45(6):57-63. |
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| 摘要: |
| 针对主动测量方法构建有源配电网等值模型时易对电力系统产生额外干扰的问题，开展了适用于跟网型和构网型逆变器场景下的有源配电网等值模型计算研究。通过分析现有电网阻抗计算方法存在的不足，提出了基于叠加定理的电网等值模型被动构建方法，即通过系统自身微小扰动，结合叠加定理计算配电网的等值阻抗和开路电压，进而将复杂配电网络简化为含有独立电压源和阻抗串联的单口网络模型。MATLAB/Simulink仿真结果和含高渗透率分布式电源的配电网算例分析均表明，所提方法在保证系统稳定性的同时，可在多种工况下准确计算出系统等值模型，避免了主动计算方法中频率波动和谐波干扰带来的问题，计算结果精度和速度均优于现有方法。 |
| 关键词: 电网等值模型 电网等值阻抗 分布式电源 叠加定理 配电网 |
| DOI：10.16081/j.epae.202503004 |
| 分类号:TM744 |
| 基金项目:国家自然科学基金资助项目(52207102)；中央高校基本科研业务费专项资金资助项目(2024MS110);2023年度河北省高等学校科学研究项目(ZC2023047)；保定市科技计划项目(2211ZG015) |
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| Equivalent impedance measurement method of active distribution network based on superposition theorem |
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JIA Jiaoxin1, YANG Yaohui1, JIA Kaixuan1, YAN Xiangwu1, SHAO Chen2
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1.Key Laboratory of Distributed Energy Storage and Microgrid of Hebei Province, North China Electric Power University, Baoding 071003, China;2.College of Mechatronical & Electrical Engineering, Hebei Agricultural University, Baoding 071006, China
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| Abstract: |
| In order to solve the problem that the active measurement method is easy to cause extra interfe-rence to the power system when constructing the active distribution network equivalent model, the calculation of the active distribution network equivalent model is carried out in the scenario of grid-forming and grid-following inverter. Based on the analysis of the shortcomings of the existing impedance calculation methods, a passive construction method of the grid equivalent model based on the superposition theorem is proposed, that is, the equivalent impedance and open circuit voltage of the distribution network are calculated through the small disturbance of the system itself and by combining the superposition theorem, and then the complex distribution network is simplified into a single-port network model with independent voltage source and impedance in series. The results of MATLAB/Simulink simulation and the analysis of the distribution network with high permeability distributed power supply show that the proposed method can accurately calculate the equivalent model of the system under various working conditions while ensuring the stability of the system. The problems caused by frequency fluctuation and harmonic interference in the active calculation method are avoided, and the accuracy and speed of the calculation results are better than those of the existing methods. |
| Key words: grid equivalent model equivalent impedance of grid distributed power supply superposition theorem distribution network |
