高电压大容量实验基地接入电网的电压暂降影响研究

Research on Voltage Sags Influence of High Voltage Level and Bulk Experiment Base Access to Power System

目前,国内接入电压等级最高的电器实验基地将接入甘肃天水330 kV电网,开展开关电器动热稳定实验和变压器短路等实验项目,实验期间持续性的短路将引起甘肃电网严重的电压暂降。为了评估电压暂降给系统带来的影响,先对电网考核实验基地接入的标准进行了筛选,并以甘肃电网数据为基础,仿真计算了不同实验项目和不同实验容量的电压暂降幅值,最终根据仿真结果和国家标准分析了电压暂降对继电保护、发电厂辅机、周边敏感负荷设备等的影响。研究结论可用于支撑大容量开关电器短路实验基地接入系统的安全性评估。

An electric switch experimental study base, which operates on the highest voltage level domestically, will access to Gansu 330 kV Tianshui power grid. The main experiments in the base are switch dynamic and thermal current experiments and transformer short circuit experiments. During experiments, the continuous short circuit will cause severe voltage sags of Gansu power system. In order to evauiate effects of voltage sags to power system, appropriate standard is first selected to check experiment base accessing. Based on actual data of Gansu power grid, simulation of voltage sag value is performed for different experiment projects and experiment capacities. The impacts of voltage sags to power system protection settings, power plant auxiliary machine and surrounding sensitive load equipment are analyzed according to simulation results and national standard. The results can be used to support security assessment of large-capacity switch electrical short-circuit experiment base accessing to system.