近日，华南理工大学（South China University of Technology）曾江团队以《基于改进一阶LADRC光伏逆变器母线电压控制》为题在《电机与控制应用》上发表最新研究论文，第一作者为谢宝平，通信作者为曾江。
光伏并网逆变器在新型电力系统中渗透率逐渐提高，而光伏并网逆变器的发电功率易受到光照强度、温度等环境因素的影响，对系统供电稳定性带来了一定的挑战。为了改善逆变器的控制性能，提升直流母线电压的抗扰性，提出了一种基于改进一阶线性自抗扰（LADRC）的光伏逆变器母线电压控制策略。
图1 一阶改进LADRC结构框图
本文主体内容包括以下四部分：首先对光伏逆变器进行数学建模；然后针对电压控制外环设计了一阶传统LADRC控制器，并对其中的线性扩张状态观测器进行改进，减小了观测误差，据此提出了基于一阶改进LADRC的控制策略；其次，在频域上对传统LADRC和改进LADRC进行对比分析，可知改进LADRC控制策略下的系统带宽增大，动态跟踪能力增强，在中低频段具有更小的扰动增益；最后通过离线仿真和实验验证了所提出策略的有效性。
本文提出的方法具有较好的实用价值，使得直流母线电压外环具有更短的调节时间，抗扰性增强，系统动态性能具有较好的提升。
Bus Voltage Control of Photovoltaic Inverter Based on Improved First-Order LADRC
The penetration rate of photovoltaic grid connected inverter in the new power system is gradually increasing, and the power generation of photovoltaic grid connected inverter is easily affected by environmental factors such as light intensity and temperature, which brings certain challenges to the stability of power supply of the system. In order to improve the control performance of the inverter and the immunity of the DC bus voltage, a photovoltaic inverter bus voltage control strategy based on improved first-order linear active disturbance rejection (LADRC) is proposed.
The main content of this paper includes the following four parts: firstly, the mathematical model of photovoltaic inverter is established; Then a first-order traditional LADRC controller is designed for the voltage control outer loop, and the linear extended state observer is improved to reduce the observation error. Based on this, a control strategy based on the first-order improved LADRC is proposed; Secondly, the traditional LADRC and the improved LADRC are compared and analyzed in the frequency domain. The results show that the improved LADRC control strategy can increase the system bandwidth, enhance the dynamic tracking ability, and have smaller disturbance gain in the medium and low frequency band; Finally, the effectiveness of the proposed strategy is verified by off-line simulation and experiments.
The method proposed in this paper has great practical value, making the DC bus voltage outer loop have shorter regulation time, enhanced immunity, and better improvement of system dynamic performance.
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/20240401
推荐引用格式：
谢宝平, 曾江, 刘佩, 赵本强, 马海杰, 叶康权. 基于改进一阶LADRC光伏逆变器母线电压控制[J]. 电机与控制应用, 2024, 51(4): 1-11.
XIE Baoping, ZENG Jiang, LIU Pei, ZHAO Benqiang, MA Haijie, YE Kangquan. Bus Voltage Control of Photovoltaic Inverter Based on Improved First-Order LADRC[J]. Electric Machines & Control Application, 2024, 51(4): 1-11.
谢宝平，华南理工大学电力学院硕士研究生，研究方向为光伏并网逆变器控制技术。19866793959@163.com
Xie Baoping, graduate student of the school of electric power, South China University of Technology, majoring in photovoltaic grid connected inverter control technology. 19866793959@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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