摘要
针对直流微电网接入单相交流负荷引起直流母线产生二倍频电压脉动问题,文章从阻抗建模的角度出发,提出了基于阻抗模型的直流微电网二次纹波协调控制策略。首先,分析了直流微电网二次纹波电压的起源,建立直流微电网各单元的阻抗模型,比较分析了传统控制策略下各变换器在100 Hz处的阻抗大小及功率分配关系。在此基础上,通过引入带通和带阻滤波器,重塑各关键变换器在100 Hz处的输入输出阻抗,实现储能变换器对二次纹波电流的有效抑制。为进一步降低二次纹波功率对接入直流母线单元的影响,引入有源电容变换器,通过调节有源电容器虚拟电容实现对二次纹波功率的主动控制,从而达到抑制直流母线二次纹波电压的效果;其次,通过绘制Bode图,分析了基于阻尼阻抗控制的各变换器的稳定性;最后,利用仿真验证了文章所提控制策略的有效性。
To address the double-frequency voltage pulsation issue in DC bus caused by single-phase AC loads integration in DC microgrids,this paper proposes an impedance model based coordinated control strategy for secondary ripple mitigation from the perspective of impedance modeling.Firstly,this paper analyzes the origin of the secondary ripple voltage of the DC microgrid,establishes the impedance model of each unit of the DC microgrid,and compares and analyzes the impedance and power distribution relationship of each converter at 100 Hz under the traditional control strategy.On this basis,the paper introduces band-pass and band stop filters to reshape the output impedance of each key converter at 100 Hz,so as to realize the effective suppression of secondary ripple current by energy storage converter.In order to further reduce the influence of DC bus secondary ripple voltage on uncontrollable converter and ensure the voltage quality of DC bus.The active capacitor converter is introduced to actively control the secondary ripple power by adjusting the virtual capacitance of the active capacitor,so as to suppress the secondary ripple voltage of the DC bus;Then,by drawing Bode diagram,the stability of each converter based on damping impedance control is analyzed;Finally,the effectiveness of the control strategy proposed in this paper is verified by simulation.
作者
樊斌
李学进
赫亚鹏
李欣芪
任春光
韩肖清
Fan Bin;Li Xuejin;He Yapeng;Li Xinqi;Ren Chunguang;Han Xiaoqing(Shanxi Key Lab of Power System Operation and Control,Taiyuan University of Technology,Taiyuan 030024,China;China Energy Engineering Group Investment Co.Ltd.,Shanxi Branch,Taiyuan 030001,China)
出处
《可再生能源》
北大核心
2025年第6期794-803,共10页
Renewable Energy Resources
基金
国家自然科学基金(51807130)
山西省重点研发计划(202102060301012)。
关键词
直流微电网
二次纹波
有源电容变换器
虚拟阻抗
DC microgrid
secondary ripple
active capacitor converter
virtual impedance
