直流孤岛方式下水轮发电机组调速器精确建模研究

Research on Precise Modeling on Governor of Water-turbine Generator Unit Under DC Island Mode

孤岛运行时,由于系统容量相对单台机组较小,扰动后频率波动范围较大,现有常用调速器模型无法准确模拟水轮发电机组的响应,不能对直流孤岛工况进行正确的计算分析。为此,以楚穗直流送端大型水电厂实际机组为例,建立了调速器精确模型,并将EMTDC仿真与试验结果对比,证明该模型可精确模拟调速器各环节的响应,适用于直流孤岛运行各工况的仿真计算。

Due to system capacity being comparatively small than that of single unit at the time of island running,fluctuation range of frequency after disturbance is larger,present common governor model can not correctly simulate response of water-turbine generator unit and conduct correct calculation analysis on working condition of the DC island.Therefore,this paper takes practical unit in Chu-sui DC sending-end large water power plant as an example,establishes precise model of the governor and compares EMTDC simulation result and experimental result.It is proved that this model could accurately simulate response of each link of the governor which is applicable to simulating calculation on each working condition of DC island operation.