摘要
无变压器的SNOP(智能软开关)能够有效减少占地面积和投资成本,紧凑化的方式更加适用于负荷较为密集的城市区域。首先在PSCAD/EMTDC内建立了一个含无变压器型SNOP的两供区仿真模型,通过对供区内经消弧线圈接地、小电阻接地、直接接地3种接地方式的组合仿真,统计分析了SNOP在无变压器情况下零序分量的相关特性。利用电路分析和序分量分解的方式,分析了无变压器情况下故障侧零序分量引发直流电压和非故障侧交流电压波动的内在机理,阐释了仿真统计结果。研究结论可为相关工程和研究人员提供技术参考。
The transformerless SNOP can effectively reduce the footprint and the investment cost. The compact design is more suitable for urban areas with the intensive load. In the PSCAD/EMTDC, a simulation model containing two supply zones embedded in a transformerless SNOP is built. Through the combination simulation of three grounding modes: the arc suppression coil grounding, the small resistance grounding and the direct grounding, the characteristics of the zero-sequence component of SNOP in the transformerless condition are analyzed statistically. By means of circuit analysis and sequence component decomposition, the intrinsic mechanism of DC voltage fluctuation and AC voltage fluctuation in the non-fault side caused by the zero-sequence component at the fault side is analyzed, and the simulation results are explained. The conclusions of this paper provide technical reference for related engineers and researchers.
作者
许烽
陆翌
裘鹏
宣晓华
江道灼
黄晓明
XU Feng;LU Yi;QIU Peng;XUAN Xiaohua;JIANG Daozhuo;HUANG Xiaoming(State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014,China;College of Electric Engineering, Zhejiang University,Hangzhou 310027,China;State Grid Huzhou Power Supply Company,Huzhou Zhejiang 313000,China)
出处
《浙江电力》
2019年第4期34-40,共7页
Zhejiang Electric Power
基金
国家重点研发计划资助(2017YFB0903100)
关键词
无变压器
智能软开关
模块化多电平换流器
零序分量
接地方式
transformerless
soft normally open point(SNOP)
modular multilevel converter(MMC)
zerosequence component
grounding mode
