摘要
针对与有源系统相联的混合直流输电系统,以全桥子模块和半桥子模块混合的模块化多电平换流器(MMC)为例,详细分析了其预充电启动过程,给出了每个阶段直流电压的一般数学表达式,从数学上证明了其与半桥子模块或全桥子模块构成的MMC的内在联系。分析了基于全桥子模块和半桥子模块混合的MMC在不同混合比例下其预充电过程中可能存在的过压或欠压问题,提出了5种解决措施。同时就混合直流输电系统运用于向无源系统供电和作为"黑启动"电源的应用场合,分析了其预充电启动过程,并提出了具体实现方法。最后通过PSCAD/EMTDC对相关分析进行了仿真验证。
For a hybrid high voltage direct current （HVDC） transmission system connected to the active power grid, the pre charging and start up process of the half-bridge sub module and full-bridge sub module based hybrid modular muhilevel converter （MMC） is analyzed in detail. The general mathematical expressions of DC voltage in each stage are derived, and the internal relation between the hybrid MMC and the MMC composed of half-bridge sub module or the full-bridge sub module is justified mathematically. The over-voltage and under-voltage problems in the pre-charging process for the hybrid MMC under the different mix proportions are analyzed, and five feasible measures are proposed. Meanwhile, for the hybrid HVDC applied to the passive system and the application for black start, the pre charging and start-up process are analyzed, and the concrete implementation method is proposed. Finally, the proposed strategy is verified by PSCAD/EMTDC simulation.
作者
赵文强
高得力
马云龙
杨建明
王永平
卢宇
ZHAO Wenqiang1, GAO Deli2, MA Yunlong3, YANG j＇ianming1 , WANG Yongping1 , LU Yu(1. NR Electric Co. Ltd., Nanjing 211102, China; 2. State Grid Economic and Technological Research Institute Co. Ltd., Beijing 100052, China; 3. DC Construction Branch of State （;-rid Corporation of China, Beijing 100052, China; 4. NARI Group Corporation （State Grid Electric Power Research Institute, Nanjing 211106, China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2018年第7期62-70,共9页
Automation of Electric Power Systems
基金
国家电网公司科技项目"适应全球能源互联网发展的混合型直流输电及其规划技术研究"~~
关键词
半桥子模块
全桥子模块
模块化多电平换流器
预充电
高压直流输电
half.-bridge sub-module
full-bridge sub-module
modular multilevel converter （MMC）
pre charging
high voltagedirect current （HVDC）
