摘要
以双向DC/DC变流器为研究对象,针对恒功率负荷的负阻尼问题,在研究变流器阻抗特性的基础上,提出一种基于虚拟阻抗的控制方法,通过改变变流器的输出阻抗特性来提高系统的稳定性。该虚拟阻抗由虚拟电感组成,引出自电容支路。应用阻抗理论对带恒功率负荷的双向DC/DC变流器进行稳定性分析,并通过比较输出阻抗幅频曲线来分析下垂系数对变流器输出阻抗及稳定性的影响。Simulink仿真表明理论与提出的控制器设计的合理性。
Taking the Bi-directional DC/DC converter in continuous conduction mode（CCM）as research object,aimed at resolving the question of constant power load with negative impedance characteristics,the output impedance characteristics of the converter was researched on and a virtual impedance method to improve the converter′s stability was proposed. The virtual impedance was consisted of virtual inductances,and the output capacitor branch was located.The stability of the converter was analysed by using the impedance theory. The influence that droop coefficient on the converter output impedance were discussed through the amplitude frequency characteristic analysis of output impedance. Simulink results verify the correctness of the theoretical analysis and the controller design.
作者
杨帆
刘郁权
YANG Fan, LIU Yuquan(College of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, Chin)
出处
《电气传动》
北大核心
2018年第6期23-28,共6页
Electric Drive
基金
国家自然科学基金资助项目(51407114)
上海绿色能源并网工程技术研究中心资助项目(13DZ2251900)
关键词
变流器
恒功率负荷
阻抗特性
虚拟阻抗
稳定性
converter
constant power load（CPL）
impedance characteristics
virtual impedance
stability
