直流融冰装置对贵州电网电压稳定性的影响研究

Research on the influence of DC ice-melting devices on voltage stability of Guizhou power grid

目前,国内外电网均缺乏大规模应用直流融冰装置的实践经验,随着大量融冰装置的应用,对系统电压稳定性的影响已经不能忽略,在电网遭受到大面积严重覆冰灾害时,由于大量线路覆冰严重,为保证电网安全运行,需要同步进行融冰操作。在考虑电网安全约束、分区分层原则、线路分类以及气象因素等多约束条件下,以对更多线路进行不同类型的融冰。通过研究对实时运行系统中的可投运的融冰装置节点进行电压稳定性分析,给出现有实时融冰装置节点的电压强弱排序,为下一步研究直流融冰装置的优化调度策略打下基础,提高电压水平,改善电能质量,为已投运的直流融冰装置的无功管理提供具体策略,对构建坚强的智能电网,具有十分重要的理论意义和实用价值。

At present,domestic and foreign power grids lack the practical experience of applying DC ice-melting devices in large-scale applications. With the application of a large number of DC ice-melting devices,the impact on system voltage stability cannot be ignored. When the power grid was subjected to large-scale severe ice-covering disasters,a great number of line were severely covered with ice,and in order to ensure the safe operation of the power grid,ice melting operations must be performed simultaneously. Considering the safety constraints of the power grid,the principle of stratified zoning,line classification and meteorological factors and other constraints,different types of ice melting would be carried out for more lines. Through studying the voltage stability analysis of the operational ice-melting devices nodes in the real-time running system,the voltage strength of the existing real-time ice-melting device nodes was sorted,which lays the foundation for further research on the optimal scheduling strategy of DC ice-melting devices. Improving voltage levels,ameliorating power quality,providing specific strategies for the reactive power management of DC ice-melting devices that have been put into operation. It is of great theoretical and practical value to build a strong smart grid.