摘要
设计了一种基于模块化多电平型固态变压器(modular multilevel converter-solid state transformer,MMC-SST)的新型直流微网架构,可最大限度地适应新能源的接入,提高系统的电能质量,真正实现能量的双向按需传输和动态平衡使用。首先,详细分析了基于MMC-SST的新型直流微网的系统结构,并给出了MMC-SST主电路拓扑;然后,对MMC-SST各级的控制策略和直流微网子系统能量管理算法进行了优化设计,使MMC-SST能够按照给定的功率因数运行,并具有比传统控制方式更快的瞬态响应速度和更强的鲁棒性,实现了直流微网子系统的灵活、经济、可靠运行;最后,通过搭建基于MMC-SST的新型直流微网子系统的简化计算机仿真平台,进行综合仿真验证了提出的架构和控制策略的可行性和有效性。
A new DC microgrid architecture based on modular multilevel converter type solid state transformer（MMC-SST） is proposed in this paper.It can accommodate renewable energy in maximum extent, improve power quality and realize bi-directional demand-dependent transmission and dynamic balanced energyutilization. Firstly, new DC microgridsystem structure based on MMC-SST is analyzed in detail.Its main circuittopology of MMC-SST is given. Secondly, optimization design is performed for MMC-SST control strategy and energy management algorithm in DC microgrid subsystem, making MMC-SST run under given power factor with faster transient response and stronger robustness than traditional mode.It canalso realize flexible, economical and reliable operation of DC microgrid system. Finally, a simplified simulation platform of new DC microgrid subsystem based on MMC-SST is established.Comprehensive simulationresults verify feasibility and effectiveness of the proposed structure and its control strategy.
出处
《电网技术》
EI
CSCD
北大核心
2016年第3期733-740,共8页
Power System Technology
基金
国家自然科学基金项目(51377050
51377001
61233008)
科技部国际合作项目(2015DFR70850)~~
关键词
模块化多电平变流器
固态变压器
直流微网
新能源
控制策略
modular multilevel converter
solid state transformer
DCmicrogrid
renewable energy
control strategy
