摘要
链式拓扑用于混合储能系统(hybrid energy storage system,HESS)时,储能元件类型及电压的不对称以及各链节交流测电流耦合的特点,导致传统调制方法难以实现各链节独立功率控制,因而无法适用于链式HESS复杂的工作模式。该文提出不对称链式HESS的混合载波层叠调制技术(hybrid level shifted PWM,HLS-PWM)。首先,按照超级电容器链节的输出功率方向与HESS输出功率方向的关系划分成同向及反向2种基本模式。然后,利用这2种模式实现在单位功率因数及非单位功率因数下超级电容器充放电控制,进而提出基于HLS-PWM的链式HESS的5种工作模式及功率控制方法。最后,利用仿真与实验对所提调制方法及控制策略进行验证。
When the cascaded H-bridge topology is used in the hybrid energy storage system(HESS),the asymmetry of the energy storage components’types and voltages and the coupled AC current makes it difficult for the traditional modulation methods to realize independent power control of each energy storage unit.Thus,these methods can not be applied to the realization of the complex working modes of HESS.Therefore,this paper proposed an asymmetric cascaded HESS hybrid level shifted PWM(HLS-PWM)modulation technique.According to the direction of supercapacitors’output power and the total output power of the energy storage system,the HLS-PWM was divided into the two fundamental modes-the same(MP)and opposite(MN)modes.And then the supercapacitor charge and discharge control under unit power factor and non-unit power factor was analyzed based on the two modes.Furthermore,the five operation modes and power control method of HESS was implemented through the charge and discharge control of the supercapacitor.Finally,simulation and experimental results verify that the proposed HLS-PWM can realize the power control of asymmetric cascaded HESS.
作者
蒋玮
薛帅
JIANG Wei;XUE Shuai(School of Electrical Engineering,Southeast University,Nanjing 210096,Jiangsu Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2020年第13期4266-4276,共11页
Proceedings of the CSEE
基金
国家自然科学基金项目(51877041)。
关键词
混合储能系统
不对称链式拓扑
载波层叠PWM
功率控制
hybrid energy storage system
asymmetry cascaded H-bridge
level shifted PWM
power control
