摘要
随着模块化多电平换流器(Modula Multi-Level Converter,MMC)不断发展,未来电网会形成含MMC的多直流母线、多直流电源和多直流负荷的交直流混合网络。首先分析了MMC的拓扑结构、模型等效处理,然后详细阐述了含MMC直流电网电压下垂控制策略,在此基础上推导出了基于电压下垂控制的含MMC直流电网潮流计算方法。以7端MMC-MTDC(MMC Multi-Terminal HVDC)直流系统为例,分别求解同一系统给定条件下电压下垂控制的稳态潮流和系统发生波动后的稳态潮流,通过两种运行状态稳态潮流结果的比较分析,得出电压下垂控制策略是有效的,从而验证了所提基于电压下垂控制的含MMC直流电网潮流计算方法的正确性。
With the development of modular Multi-Level Converters （MMCs）, the power grid will form an ac-dc hybrid network containing MMC multi-dc bus, multi-dc power supply and multi-dc load in the future. In this paper, firstly, the topology of MMC and the equivalent model are analyzed. Then the voltage droop control strategy with MMC is described in detail. On the basis of this, the power flow calculation method based on voltage droop control is proposed. Taking a 7-terminal MMC-MTDC DC system as an example, the steady-state tidal current under voltage droop control and the steady-state tidal current after system fluctuation are solved respectively under the given conditions of the same system. By comparing the steady-state tidal current results at two operating states, the voltage droop control strategy is proved to be effective, which verifies the correctness of the power flow calculation method based on droop control with MMC in this paper.
作者
张朝学
邹晓松
余梦天
朱余林
高志鹏
李芷萧
ZHANG Chaoxue;ZOU Xiaosong;YU Mengtian;ZHU Yulin;GAO Zhipeng;LI Zhixiao(College of Electrical Engineering,Guizhou University,Guiyang 550025,China)
出处
《电力科学与工程》
2018年第11期1-7,共7页
Electric Power Science and Engineering
基金
国家自然科学基金(51667007)
中国南方电网有限责任公司终点科技项目(GZKJQQ00000417)
贵州省科技创新人才团队项目([2018]5615)
关键词
模块化多电平换流器
交直流混合电网
电压下垂控制
潮流计算
modular multi-level converter
AC and DC hybrid power grid
voltage droop control
trend calculation
