虚拟复阻抗下垂控制的多逆变器并联小信号建模  

Multi-inverter parallel small-signal modeling based on virtual complex impedance droop control

作　　者：张继红[1,2] 王娟 张自雷[1,2] 杨培宏[1,2] 吴振奎[1,2] 冀伟成 ZHANG Jihong;WANG Juan;ZHANG Zilei;YANG Peihong;WU Zhenkui;JI Weicheng(Inner Mongolia Key Laboratory of Solar and Wind Power,Inner Mongolia University of Science and Technology,Baotou 014010,China;School of Information Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学内蒙古自治区光热与风能发电重点实验室,内蒙古包头014010 [2]内蒙古科技大学信息工程学院,内蒙古包头014010

出　　处：《中国测试》2023年第1期145-154,共10页China Measurement & Test

基　　金：内蒙古自治区关键技术攻关项目(2019GG319);内蒙古自然科学基金项目(2021MS05039);内蒙古自治区高等学校科学研究项目(NJZY21379)。

摘　　要：多逆变器并联是解决光伏等分布式发电扩容、备用、保护的重要手段。针对传统下垂控制方法抗扰能力弱、环流现象严重以及容易产生振荡等不足,文章提出基于虚拟复阻抗的改进下垂控制策略,建立并网模式的传统下垂控制与改进下垂控制逆变器并联小信号数学模型,分析系统特征根的分布对于有功下垂系数、无功下垂系数的影响问题,通过引入虚拟复阻抗增强低频域环境的特征根阻尼,解决逆变器并联运行的振荡难题,研究元件参数对于系统稳定性的影响,为并联逆变器参数选型提供理论依据。最后通过Matlab/Simulink建立数学模型、设置相应参数、验证所提控制策略的合理性与可行性。The parallel connection of multiple inverters is an important means to solve the expansion,backup and protection of distributed power generation such as photovoltaics.Aiming at the disadvantages of traditional droop control methods such as weak anti-disturbance ability,serious circulation phenomenon and easy oscillation,the article proposes an improved droop control strategy based on virtual complex impedance,and establishes a parallel connection mode of traditional droop control and improved droop control inverters in parallel The small-signal mathematical model analyzes the influence of the distribution of system characteristic roots on the active droop coefficient and reactive power droop coefficient.By introducing virtual complex impedance,the characteristic root damping of the low-frequency domain environment is enhanced,and the oscillation problem of parallel operation of inverters is solved.Studied the influence of component parameters on system stability,and provided a theoretical basis for the parameter selection of parallel inverters.Finally,a mathematical model is established through Matlab/Simulink,and the corresponding parameters are set to verify the rationality and feasibility of the proposed control strategy.

关 键 词：分布式发电 逆变器 下垂控制 小信号分析 虚拟复阻抗 

分 类 号：TM9[电气工程—电力电子与电力传动]