计及频率耦合的单相光伏变流器谐波潮流分析模型  

Analysis model of harmonic power flow for single‑phase photovoltaic converters considering frequency coupling

作　　者：高波 何福长 韩建 李泽文 余勇祥 GAO Bo;HE Fuchang;HAN Jian;LI Zenwen;YU Yongxiang(School of Electrical and Automation Engineering,East China Jiaotong University,Nanchang 330000,China;State Key Laboratory for Performance Monitoring and Guarantee of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330000,China)

机构地区：[1]华东交通大学电气与自动化工程学院,江西南昌330000 [2]华东交通大学省部共建轨道交通基础设施性能监测与保障国家重点实验室,江西南昌330000

出　　处：《电力科学与技术学报》2024年第5期216-225,共10页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金(52367015);江西省自然科学基金(20232BAB214065)。

摘　　要：单相光伏逆变器被广泛应用于配电系统,研究其谐波模型对于谐波潮流分析、谐波交互影响与电力系统稳定具有重要意义。首先,通过分析电网与逆变器的交互机理与逆变器交直流侧的谐波传导,推导出单相光伏逆变器在不同谐波下的阻抗公式;其次,分析谐波阻抗的频率耦合机制并结合控制环节,建立不同谐波下单相逆变器的谐波耦合阻抗矩阵模型与等效戴维南电路;再次,基于所提模型对系统进行谐波分析,极大地简化单相逆变器的谐波潮流分析,提高系统谐波潮流的计算精度,并能有效评估单相逆变器的接入对电能质量的影响;最后,通过时域仿真验证了所建立模型的正确性和有效性。Single-phase photovoltaic inverters are widely used in distribution systems,and studying their harmonic models is of great significance for harmonic power flow analysis,harmonic interaction effects,and power system stability.Firstly,by analyzing the interaction mechanism between the grid and the inverter,as well as the harmonic conduction on the AC-and DC-side of the inverter,the impedance formulas of the single-phase photovoltaic inverter under different harmonics are derived.Secondly,the frequency coupling mechanism of harmonic impedance is analyzed in conjunction with the control loop,and the harmonic coupling impedance matrix model and equivalent Thévenin circuit of the single-phase inverter under different harmonics are established.Furthermore,based on the proposed model,a harmonic analysis of the system is conducted,revealing that the model significantly simplifies the harmonic power flow analysis of the single-phase inverter,improves the calculation accuracy of the system's harmonic power flow,and can effectively assess the impact of connecting the single-phase inverter on power quality.Finally,timedomain simulations are conducted to verify the correctness and effectiveness of the established model.

关 键 词：单相逆变器 谐波阻抗模型 光伏发电系统 谐波潮流分析 谐波耦合 

分 类 号：TM712[电气工程—电力系统及自动化]