摘要
直流微电网群中的恒功率负载呈现负阻抗特性,会对直流微电网群稳定性造成不利影响,因此需对直流微网群稳定性功率界限进行分析。针对此类问题,文中采用混合势函数,对含恒功率负载的直流微电网群进行大信号稳定性分析。根据子微网间连接的DC-DC变换器特性,将直流微电网群等效成子微网与受控电流源并联的形式,以此建立直流微电网群大信号等效电路图。由混合势函数理论推导出直流微电网群大信号稳定性判据,并依据判据进行稳定性分析。通过MATLAB/Simulink进行验证,证明直流微电网群经恒功率负载突增后,若满足稳定性判据,则该直流微网群可保持稳定运行。
The constant power load in DC microgrid group presents negative impedance characteristics,which will adversely affect the stability of DC microgrid group.Therefore,it is necessary to analyze the stability power limit of DC microgrid group.In order to solve the problem,this study uses a mixed potential function to analyze the large-signal stability of a DC microgrid group with a constant power load.According to the characteristics of the DC-DC converters connected between the sub-microgrids,the DC microgrid group is equivalent to a sub-microgrid and a controlled current source in parallel,so as to establish the large signal equivalent circuit diagram of the DC microgrid group.The large-signal stability criterion of the DC microgrid group is derived from the mixed potential function theory,and the stability analysis is carried out according to the criterion.Verification by MATLAB/Simulink proves that the DC microgrid group can maintain stable operation if it meets the stability criterion after the constant power load increases.
作者
王玉梅
张子寒
王浩
WANG Yumei;ZHANG Zihan;WANG Hao(School of Electrical Engineering and Automation,Henan Polytechnic University,Jiaozuo 454003,China)
出处
《电子科技》
2022年第1期66-72,共7页
Electronic Science and Technology
基金
河南省科技攻关项目(112102210004)。
关键词
直流微电网群
DC-DC变换器等效模型
微网大信号等效模型
混合势函数模型
混合势函数判据
稳定性判据分析
恒功率负载
稳定性仿真分析
DC microgrid group
DC-DC converter equivalent model
microgrid large signal equivalent model
mixed potential function model
mixed potential function criterion
stability criterion analysis
constant power load
stability simulation analysis
