近日，华南理工大学（South China University of Technology）曾江团队以《基于光伏逆变器的电网谐波阻抗测量新技术》为题在《电机与控制应用》上发表最新研究论文，第一作者为赵本强，通信作者为曾江。
针对新型电力系统背景下电网谐波阻抗的测量需求，提出了一种基于光伏逆变器的新型电网谐波阻抗测量方法。该方法在基波下控制光伏逆变器实现正常发电功能，在谐波下控制其等效为虚拟电阻。通过改变逆变器的等效虚拟谐波电阻值，测量并网点谐波电压的幅值，并结合最小二乘法来估算系统的谐波阻抗幅值。
图1 谐波阻抗测量结构图
本文主体内容包括以下三个部分：首先，对光伏逆变器进行数学建模，然后介绍了虚拟谐波电阻的控制原理，并据此提出系统谐波阻抗测量方法，分析了本文所提方法相较于传统谐波电流注入法的优势，最后通过硬件在环仿真验证了所提策略的有效性。
本文所提方法不仅可测量系统多次谐波阻抗幅值，且能保证较高的测量精度，具有较高的应用价值。
New Technology of Grid Harmonic Impedance Measurement Based on Photovoltaic Inverter
In response to the demand for grid harmonic impedance measurement in the context of new power systems，a novel grid harmonic impedance measurement method based on photovoltaic inverter is proposed．The method controls the photovoltaic inverter to function as a normal power generator under fundamental waves and controls it to be equivalent to a virtual resistor under harmonics．By changing the equivalent virtual harmonic resistance value of the inverter，the amplitude of the harmonic voltage at the grid connection point is measured，and combined with the least squares method to estimate the harmonic impedance amplitude of the system.
The main content of this article includes the following three parts: Firstly, mathematical modeling of photovoltaic inverters is carried out. Then, the control principle of virtual harmonic resistance is introduced, and a system harmonic impedance measurement method is proposed based on this. The advantages of the proposed method compared to traditional harmonic current injection method are analyzed. Finally, the effectiveness of the proposed strategy is verified through Hardware in the loop simulation.
The method proposed in this article not only measures the amplitude of multiple harmonic impedances in the system, but also ensures high measurement accuracy and has high application value.
支持基金：
广东省自然科学基金(2021A1515012616)
Natural Science Foundation of Guangdong Province, China (2021A1515012616)
论文链接：
http://www.motor-abc.cn/djykzyy/article/abstract/20240301
推荐引用格式：
赵本强, 曾江, 谢宝平, 马海杰, 刘佩, 叶康权. 基于光伏逆变器的电网谐波阻抗测量新技术[J]. 电机与控制应用, 2024, 51(3): 1-9.
ZHAO Benqiang, ZENG Jiang, XIE Baoping, MA Haijie, LIU Pei, YE Kangquan. New Technology of Grid Harmonic Impedance Measurement Based on Photovoltaic Inverter[J]. Electric Machines & Control Application, 2024, 51(3): 1-9.
赵本强，华南理工大学电力学院硕士研究生，研究方向为电能质量分析与控制。15070028971@163.com
Zhao Benqiang is a master's candidate at the School of Electric Power, South China University of Technology, with a research focus on power quality analysis and control. 15070028971@163.com
曾江，华南理工大学电力学院副教授，硕士生导师，长期从事电力系统分析、电能质量分析与控制、智能配电网、节能技术，主持国家自然基金和多项南网重点项目，发表论文一百余篇，其中SCI收录6篇，EI收录数十篇。获中国电力发明二等奖、深圳市科技进步一等奖、南方电网科技进步一等奖、中国电力创新二等奖等多个奖项。当前研究领域跨电力系统、电力电子、控制理论等几个学科，主要方向是：1. 新能源并网技术。主要研究在新型电力系统背景下如何实现新能源并网变流器对电网的主动支撑，改善新型电力系统的电能质量和稳定性，增强电力系统的振荡阻尼。2. 电能质量分析与控制。主要研究各类电能质量问题，包括低电压、谐波和电压暂降等重大问题的分析、评估和治理技术。zengxy@scut.edu.cn
Zeng Jiang, Associate Professor and Master's Supervisor of the School of Electric Power at South China University of Technology, has been engaged in power system analysis, power quality analysis and control, intelligent distribution network, and energy-saving technology for a long time. He has led the National Natural Science Foundation of China and multiple key projects of the China Southern Power Grid, and has published over 100 papers, including 6 indexed by SCI and dozens indexed by EI. Has won multiple awards, including the Second Prize of China Electric Power Invention Award, the First Prize of Shenzhen Science and Technology Progress Award, the First Prize of China Southern Power Grid Science and Technology Progress Award, and the Second Prize of China Electric Power Innovation Award. The current research field spans several disciplines such as power systems, power electronics, and control theory, with the main directions being: 1. New energy grid connection technology. The main research focuses on how to achieve active support of new energy grid connected inverters for the power grid in the context of a new power system, improve the power quality and stability of the new power system, and enhance the oscillation damping of the power system. 2. Analysis and control of power quality. Mainly researching various types of power quality issues, including analysis, evaluation, and governance techniques for major issues such as low voltage, harmonics, and voltage transients. zengxy@scut.edu.cn
曾江老师邮箱：zengxy@scut.edu.cn
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