基于大信号稳定的直流微电网Buck变换器自适应无源控制策略  

An adaptive passivity-based control of buck converter for direct current microgrids with large-signal stability

作　　者：郑城市 刘洋 李健 翟波 王盼宝[2] ZHENG Chengshi;LIU Yang;LI Jian;ZHAI Bo;WANG Panbao(State Grid Henan Electric Power Company Jiyuan Power Supply Company,Jiyuan 459000,China;School of Electrical Engineering and Automation,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]国网河南省电力公司济源供电公司,河南济源459000 [2]哈尔滨工业大学电气工程及自动化学院,黑龙江哈尔滨150001

出　　处：《安徽大学学报(自然科学版)》2025年第2期56-67,共12页Journal of Anhui University(Natural Science Edition)

基　　金：国网河南省电力公司科技合作项目(5217D0230001);国家自然科学基金资助项目(52377173)。

摘　　要：恒功率负载因其所具有的负阻抗特性而成为威胁直流微电网系统稳定运行的主要因素之一。为了消除恒功率负载负阻抗特性以及源荷端不确定性对直流微电网中Buck变换器稳定运行的影响,该文提出一种自适应无源控制策略,即以无源控制理论为基础,通过虚拟阻抗技术对系统阻抗进行重新优化调整以使得整个系统处于无源稳定状态。针对因系统不确定性致使偏离额定工作状态而造成的稳态误差,该文设计了高阶扰动观测器对源荷端不确定性所造成的稳态误差进行前馈补偿,从而保证系统在扰动以及不确定性状况下的稳定无误差运行此外,为了确保所提控制策略的大信号稳定,该文采用混合势函数理论进行稳定性分析并给出参数选取准则.另外,该文还通过Matlab/Simulink仿真平台对所提控制策略的有效性和优越性进行了仿真验证.Due to the negative impedance characteristic of constant power load,the constant power load becomes one of the main factors threatening the stable operation of direct current microgrid system.To eliminate the negative impedance characteristics of constant power load and the source-load uncertainty to the stable operation of buck converter for direct current microgrid,an adaptive passivity based control strategy is proposed in this article,which is based on the passive control theory,and the virtual impedance technique is used to optimize and adjust the impedance of the system so that the whole system is in a passive and stable state.For the steady-state error caused by the deviation from the rated operating state due to the uncertainty of the system,this article designed higher-order disturbance observer to feed-forward compensate the steady-state error caused by the uncertainty at the sourceload,thus ensuring the stable and error-free operation of the system under the disturbance and uncertainty conditions.In addition,to ensure the large-signal stability of proposed control strategy,the mixed potential theory is used for stability analysis and parameter selection criteria are provided.Moreover,the article also verified the effectiveness and superiority of proposed control strategy is simulated by Matlab/Simulink simulation platform.

关 键 词：直流微电网 恒功率负载 BUCK变换器 无源控制 大信号稳定 

分 类 号：TM46[电气工程—电器]