二滩水电站机组无功功率波动分析

基于电力系统普叙线路发生的一次瞬时故障跳闸,从理论上分析了系统故障后发电机组无功功率大幅波动的现象。分析发现,二滩水电站在枯水季节机组进相运行时,运行功角越大的机组越易受系统影响而不稳定,从而提出远离低励限制曲线运行、在励磁系统建模试验时增加低励限制与电力系统稳定器（PSS）功能环节配合试验等保障发电机安全稳定运行的改善措施。

Analysis of Reactive Power Fluctuation in Ertan Hydropower Station

Based on a transient fault trip of Pu-Xu transmission line, the phenomenon that the reactive power of generators fluctuated sharply after the system fault is analyzed in theory. It is found that the larger the power angle is, the more vulnerable the unit will be when generators are in leading phase operation in Ertan Hydropower Station in dry season. Thus some improvement methods are put forward in order that the generators can operate more safe and more stable, including keeping the generator operating far away from the under excitation limit （UEL） curve and adding the coordination test between UEL and power system stabilizer.