摘要
在直流微电网中,交流负载会导致直流母线电压和源电流以交流电频率的两倍进行振荡,这些二阶振荡会影响系统的工作状态。本文提出一种虚拟阻抗整形的控制策略,用于同时供给交流和直流负载的直流微电网中,调节传播到电源输入端的电流纹波。所提出的控制方法通过一个阻抗控制回路,在2fac处调节DC/DC变换器的电感支路等效阻抗,使得节点二阶纹波电流(SRC)相对大小可调节。此外还分析了阻抗整形、元件参数变化与节点间通信延迟等情况对系统性能的影响。最后通过搭建仿真和实验平台验证了所提控制策略的有效性。
In a DC microgrid,AC loads cause the DC bus voltage and source current to oscillate at twice the frequency of the alternating current.These second-order oscillations can affect the operating state of the system.This paper proposes a virtual impedance shaping control strategy for DC microgrids that supply both AC and DC loads simultaneously,aiming to regulate the current ripple propagated to the input of the power source.The proposed control method adjusts the equivalent impedance of the inductor branch of the DC/DC converter at 2fac through an impedance control loop,enabling the relative magnitude of the second-order ripple current(SRC)at the node to be adjustable.Additionally,the impacts of impedance shaping,changes in component parameters,and communication delays between nodes on the system performance are analyzed.Finally,the effectiveness of the proposed control strategy is verified by building simulation and experimental platforms.
作者
赖俊波
刘斌
赵博涵
李俊
孙宏宇
Lai Junbo;Liu Bin;Zhao Bohan;Li Jun;Sun Hongyu(College of Information Engineering,Nanchang Hangkong University,Nanchang 330063,China;Hebei Huineng Xinyuan Electronic Technology Co.,Ltd.,Shijiazhuang 050051,China)
出处
《电力电子技术》
2025年第11期8-15,共8页
Power Electronics
基金
国家自然科学基金(61963030)
自动化教指委教改项目(202137)。
作者简介
赖俊波(2000-),男,硕士研究生,研究方向为电力电子系统的设计及控制。E-mail:453506970@qq.com。
