摘要
针对孤岛型微电网并联逆变系统,分析功率分配特性及并联逆变器引发的环流问题,研究其环流产生的机理,并据此进行相应的数学建模。提出增强型鲁棒电压下垂控制方案,重点将改进的比例积分(PI)控制器应用于有功-电压(P-E)和无功-频率(Q-ω)控制中,并对系统功耗进行优化,减小母线电压损失,消除阻抗影响,通过设置虚拟复阻抗消感增阻,达到抑制环流的目的。最后利用Matlab/Simulink仿真软件与微网新能源实验平台进行仿真实验验证,综合二者结果得出:所提控制方案合理、有效,对工程实际具有理论指导意义。
Aiming at the island-type microgrid parallel inverter system,this article analyzes the power distribution characteristics and the circulating current problems caused by the parallel loop,and studies the mechanism of circulating current generation. Based on this,the corresponding mathematical modeling is developed,and an enhanced robust voltage droop control scheme is proposed. The scheme focuses on the improved proportional integral(PI)controller applied to active-voltage(P-E)and reactive-frequency(Q-ω)control,and optimizes system power consumption to reduce bus voltage loss. Also,eliminate the impact of impedance,set up virtual complex impedance to eliminate inductance and increase resistance,so as to achieve the purpose of suppressing the circulation current. Finally using the Matlab/Simulink simulation and the micro-energy network integrated experimental,the proposed control scheme is verified to be reasonable and effective which has theoretical guiding significance for engineering practice.
作者
张继红
宋广宇
熊伟
冀伟成
Zhang Jihong;Song Guangyu;Xiong Wei;Ji Weicheng(Inner Mongolia Autonomous Region Key Laboratory of CSP and Wind Energy Generation,College of Information Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China;The First Military Generation Office of the Army Equipment Department in Baotou Area,Baotou 014030,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2021年第12期401-409,共9页
Acta Energiae Solaris Sinica
基金
内蒙古自治区关键技术攻关项目(2019GG319)。
关键词
并联逆变器
虚拟复阻抗
微电网
功率均衡
鲁棒下垂
环流抑制
parallel inverter
virtual complex impedance
microgrid
power sharing
robust droop
circulation current suppression
