基于Brayton-Moser模型的直流微电网Buck变换器控制策略  

Control strategy of Buck converter in DC microgrid based on Brayton-Moser model

作　　者：张梦壕 王久和[1] 张玲[2] 张雅静 李建国 ZHANG Menghao;WANG Jiuhe;ZHANG Ling;ZHANG Yajing;LI Jianguo(School of Automation,Beijing Information Science and Technology University,Beijing 100192,China;School of Architecture,Yanching Institute of Technology,Sanhe,Hebei 065201,China)

机构地区：[1]北京信息科技大学自动化学院,北京100192 [2]燕京理工学院建筑学院,河北三河065201

出　　处：《燕山大学学报》2023年第1期35-42,共8页Journal of Yanshan University

基　　金：国家自然科学基金资助项目(51777012);北京市自然科学基金-教委联合资助项目(KZ201911232045)。

摘　　要：为解决直流微电网Buck变换器对低压直流母线电压调节能力弱的问题,本文提出了一种新的控制策略。该策略通过建立带等效恒功率负载的Buck变换器的Brayton-Moser模型,构建Buck变换器系统混合势函数,设计功率成形控制器。同时,针对等效恒功率负载的负载功率未知问题,设计了功率观测器实现对恒功率负载的负载功率进行实时观测。仿真结果表明,与PI双闭环控制、外环PI内环无源控制策略相比,本文所提出的控制策略能更好地提升Buck变换器对低压直流母线电压的动态与稳态调节性能。To solve the problem that the Buck converter in DC microgrid is weak in regulating the voltage of low voltage DC bus,a new control strategy is proposed in this paper.By establishing the Brayton-Moser model of Buck converter with equivalent constant power load in this strategy,the mixed potential function of the Buck converter system is constructed,and the power forming controller is designed.At the same time,a power observer is designed to observe the unknown load power of equivalent constant power load power in real time.The simulation results show that compared with PI double closed-loop control and PI inner loop passivity-based control strategy,the control strategy proposed in this paper can improve the dynamic and steady adjusting performance of Buck converter to low voltage DC bus voltage better.

关 键 词：BUCK变换器 恒功率负载 混合势函数 Brayton-Moser模型 功率成形控制器 功率观测器 

分 类 号：TM46[电气工程—电器]