摘要
直流配电网具备线损较低、可靠性高的优势,便于分布式电源、储能与直流负荷接入。针对分布式能源接入直流配电网的场景,提出了一种便于分布式风电接入直流配电网的新型多重化换流器拓扑结构,通过数学关系推导和分析系统电压/电流谐波特性,详细设计了系统功率控制、子模块电压控制和有源滤波控制等策略,对子模块电容值进行理论设计。在PSCAD/EMTDC仿真平台搭建了风电接入中压直流配电网系统的模型,并对所提控制策略进行了仿真验证。仿真结果表明,该多重化换流器在降低成本和占用空间的同时,可以有效削减注入整个系统的谐波含量,使得交流侧具有较高的电能质量,对分布式能源的消纳和配电网的稳定性提高具有重要意义。
The DC distribution network has advantages such as low line loss,high reliability,and easy access to distributed power sources,energy storage,and DC loads.For the scenario of distributed energy access to DC distribution networks,this paper proposes a multiplex converter topology structure suitable for wind power access.The system voltage/current harmonic characteristics are derived and analyzed from mathematical relationships.Detailed control strategies including system power control,submodule voltage control,and active filter control are designed,and the submodule capacitance value is theoretically designed.Building a wind power connected to a medium voltage direct current distribution network system on the PSCAD/EMTDC simulation platform to simulate and verify the control strategy proposed in this paper.The simulation results show that this multiple converter can effectively improve the harmonic characteristics of the AC side of the system while reducing costs and occupying space,resulting in high power quality on the AC side.It is of great significance for the consumption of distributed energy and improving the stability of the distribution network.
作者
母雪东
孙家兴
MU Xuedong;SUN Jiaxing(Su Neng(Xilin Gol)Power Generation Co.,Ltd.,Xilin Gol 026321,China)
出处
《电气应用》
2025年第6期68-74,共7页
Electrotechnical Application
关键词
直流配电网
多重化换流器
子模块
比例谐振控制器
分布式电源
DC distribution network
multiplex converter
submodule
proportional resonance controller
distributed generation
