• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

电力建设 ›› 2018, Vol. 39 ›› Issue (5): 38-.doi: 10.3969/j.issn.1000-7229.2018.05.005

• 智能电网 • 上一篇    下一篇

  一种改进的模块化多电平换流器电压均衡控制策略 

 张天1,2,姜斌2,龚雁峰2    

  1. (1.国网济南供电公司,济南市 250012;2.华北电力大学, 北京市 102206)  
     
  • 出版日期:2018-05-01
  • 基金资助:
     

 An Improved Voltage Balancing Method for Modular Multilevel Converter 

 ZHANG Tian1,2, JIANG Bin2, GONG Yanfeng2 

 
  

  1.  (1.Jinan Power Supply Company, Jinan, 250012;2.North China Electric Power University, Beijing, 102206) 
     
  • Online:2018-05-01
  • Supported by:
     

摘要:  摘要:模块化多电平换流器(modular multilevel converter, MMC)以其优越的整体性能在大规模电网互联等领域具有广泛的应用前景。文章首先分析了MMC系统的工作原理,并结合一种冗余配置方法来确定MMC桥臂级联子模块的最优数量。基于最近电平逼近调制(nearest level modulation, NLM)算法,提出一种冗余子模块优先充电的MMC电容电压均衡控制策略,确保冗余子模块电压水平能够保持最低允许值,从而实现与故障子模块的平稳切换。最后,基于PSCAD/EMTDC平台搭建MMC仿真系统,验证了文章提出的改进的电容电压均衡控制策略的有效性。 

 

关键词:  , 关键词:模块化多电平换流器(MMC), 冗余配置, 电容电压均衡策略, 最近电平逼近(NLM), 子模块冗余保护 

Abstract:  ABSTRACT: Because of the preferable performance, modular multilevel converters (MMCs) have a wide application prospect in some fields including large-scale interconnection of power grids. Firstly, this paper analyzes the operational principle of MMC system, and combines the method of redundant configuration to design the optimal quantity of sub-modules on MMC arms. And then, based on the nearest level modulation (NLM) algorithm, an improved control strategy for capacitor voltage balancing of MMC is proposed, in which redundant sub-module has the charging priority to ensure its voltage stay at the level higher than the lowest standard, so that failure sub-module may be replaced smoothly. Finally, the effectiveness of the proposed control strategy is verified through simulation in PSCAD/EMTDC. 

 

Key words:  KEYWORDS:  modular multilevel converter, redundant configuration, capacitor voltage balancing strategy, nearest level modulation, redundancy protection of sub-module  

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