| 引用本文: | 洪嘉乐,石 晶,陈红坤,等.考虑电网强度的大型光伏电站并网系统谐波耦合建模与分析[J].电力系统保护与控制,2026,54(04):142-153.[点击复制] |
| HONG Jiale,SHI Jing,CHEN Hongkun,et al.Modeling and analysis of harmonic coupling in large-scale photovoltaic grid-connected systems considering grid strength[J].Power System Protection and Control,2026,54(04):142-153[点击复制] |
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| 摘要: |
| 针对大型光伏电站中大量电力电子变流器在不同系统工况下呈现出的复杂谐波耦合特性，提出了一种基于谐波状态空间法的建模及分析方法。首先，计及大型光伏电站中多发电单元间的电气联系，建立模块化且具备可扩展性的光伏电站并网系统谐波状态空间降阶模型。然后，应用所建模型揭示了并网系统谐波耦合的交互过程机理。考虑光伏电站实际规划运行中电网强度变化，研究不同规模光伏电站并网系统在不同电网强度下的谐波耦合特性，表明并网系统谐波耦合的交互强度主要取决于谐波源对并网公共母线电压的影响程度。最后，搭建了大型光伏电站并网系统的时域仿真模型，仿真结果验证了所建谐波状态空间模型的准确性及其对谐波耦合特性分析的适用性。 |
| 关键词: 大型光伏电站并网系统 谐波状态空间模型 谐波耦合特性 电网强度 |
| DOI：10.19783/j.cnki.pspc.250719 |
| 投稿时间：2025-07-19修订日期：2025-12-15 |
| 基金项目:国家自然科学基金项目资助(U23B20117) |
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| Modeling and analysis of harmonic coupling in large-scale photovoltaic grid-connected systems considering grid strength |
| HONG Jiale,SHI Jing,CHEN Hongkun,CHEN Lei |
| (School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China)) |
| Abstract: |
| To address the complex harmonic coupling characteristics exhibited by a large number of power electronic converters in large-scale photovoltaic power plants under different operating conditions, a harmonic state-space-based modeling and analysis method is proposed. First, considering the electrical connections among multiple generation units in large PV power plants, a modular and scalable reduced-order harmonic state-space model of the grid-connected PV system is established. The proposed model is then used to analyze the interaction mechanisms of harmonic coupling in the grid-connected system. By accounting for variations in grid strength during the practical planning and operation of PV power plants, the harmonic coupling characteristics of grid-connected PV power plants under different grid strengths are investigated. The results indicate that the interaction strength of harmonic coupling mainly depends on the degree to which harmonic sources affect the voltage at the point-of-common-coupling. Finally, a time-domain simulation model of a large-scale photovoltaic grid-connected system is developed, and the simulation results verify the accuracy of the harmonic state-space model and its applicability for harmonic coupling analysis. |
| Key words: large-scale photovoltaic grid-connected system harmonic state-space model harmonic coupling characteristics grid strength |
