直流微电网中DC-DC变换器的切换控制方法研究  

Switching control strategy of DC-DC converter in the DC microgrid

作　　者：卢自宝[1,2] 龚莉 赵传超 郑睿 Lu Zibao;Gong Li;Zhao Chuanchao;Zheng Rui(College of Physics and Electronic Information,Anhui Normal University,Wuhu 241002,China;Anhui Provincial Engineering Laboratory on Information Fusion and Control of Intelligent Robot,Wuhu 241002,China)

机构地区：[1]安徽师范大学物理与电子信息学院,芜湖241002 [2]安徽省智能机器人信息、融合与控制工程实验室,芜湖241002

出　　处：《仪器仪表学报》2021年第8期202-209,共8页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(61503003);安徽省自然科学基金(2008085MF199,1908085MF216);安徽省高校协同创新项目(GXXT-2019-031)资助。

摘　　要：本文针对直流微电网中的DC-DC变换器进行了研究,以变换器的开关动作为切换信号建立线性切换系统模型,基于PWM波的特性提出一种新的切换控制方法用于DC-DC变换器网络。该切换控制方法既与时间有关又与系统状态有关,首先通过系统状态误差信号来确定每一周期内的切换时间且在周期的端点处必须切换,然后将周期内对应子系统的激活时间累加得到该周期的占空比。通过仿真和实验对比,可以看出该方法限定每个开关周期只进行一次切换,能够降低系统的切换频率,在负载需求波动时能够快速响应并将输出电压稳定在期望值的±1%内,验证了该切换控制方法的优越性。该方法的实施将在一定程度上降低直流微电网的损耗和提高其稳定性。In this paper,the stability of DC-DC converter in the DC microgrid is studied.A linear switching system model is formulated,which is based on the switching action of the converter.A new switching control method based on the characteristics of PWM wave is proposed,which depends both on time and system state.First,the switching time within each period is determined by the system state error.The switching system must be switched at the end of the period.Then,the duty cycle of the period is achieved by summing the activation time of the subsystems within the period.Simulation and experiment comparison show that this method limits each switching cycle to only one switching,which can reduce the switching frequency of the system.It can respond quickly when the load demand fluctuates.The output voltage is stabilized at the desired value within the ±1%.The superiority of the switching control method is evaluated.The implementation of this method could reduce the loss of the DC microgrid to a certain extent and improve its stability.

关 键 词：直流微电网 DC-DC变换器 线性切换系统 切换控制方法 

分 类 号：TH-3[机械工程] TM712[电气工程—电力系统及自动化]