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王少伟,刘天琪,李保宏,等. 直流断线故障特性分析及一种基于控制的保护策略[J]. 科学技术与工程, 2019, 19(35): 201-207.
王少伟,et al.Analysis on Characteristic of DC Network Line Breakage Fault and a Control-based Protection Strategy[J].Science Technology and Engineering,2019,19(35):201-207.
直流断线故障特性分析及一种基于控制的保护策略
Analysis on Characteristic of DC Network Line Breakage Fault and a Control-based Protection Strategy
投稿时间:2019-04-18  修订日期:2019-09-01
DOI:
中文关键词:  模块化多电平换流器 直流环网 直流断线故障 故障特性 保护策略
英文关键词:modular multilevel converter DC loop line breakage fault fault characteristics fault protection strategy
基金项目:国家重点研发计划项目(2018YFB0904600)
           
作者单位
王少伟 School of Electrical and Information,Sichuan University
刘天琪 四川大学电气信息学院
李保宏 四川大学电气信息学院
喻悦萧 四川大学电气信息学院
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中文摘要:
      随着“直流电网”概念的形成,传输距离的增长使得架空线成为了构建直流传输网络的最佳选择。相较电缆线路,架空线故障率更高,更易发生断线故障。该文基于多端柔性直流环网拓扑结构,对直流网络中部分线路断开后换流站及相连线路的暂态特性进行了研究。阐述了故障后产生直流侧过电压以及非故障线路过电流的机理。以抑制暂态分量、加快系统恢复速度为目的,提出改进后的电流控制器模型。最后,基于PSCAD/EMTDC搭建了四端环网模型,验证了该文提出的控制策略的有效性,能够明显的抑制线路过流峰值和加快直流网络恢复速度。
英文摘要:
      With the expansion of the scale of "DC power grid" and the increase of transmission distance, overhead line has become the best choice to construct DC transmission network. Compared with cable lines, overhead lines have higher failure rate and are more prone to break down. Based on the topology of multi-terminal flexible DC loop network, the transient characteristics of converter stations and connected lines after disconnection fault are studied in this paper. The mechanism of DC side overvoltage and non-fault line overcurrent after fault is described. In order to suppress the transient components and speed up the system recovery, an improved current controller model is proposed. Finally, a four-terminal loop network model based on PSCAD/EMTDC is built to verify the effectiveness of the proposed control strategy, which can significantly suppress the peak overcurrent and improve the transient characteristics of converter station during fault.
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