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中文摘要：
水电站实际运行中的小波动过渡过程稳定性关系到整个系统过渡过程品质,对小波动过渡过程采用单一的频率调节模式有很大的局限性。本文在不考虑人工死区的前提下推导得到包含压力管道水流惯性的频率调节、功率调节、开度调节下的描述调节系统的线性常系数齐次微分方程,分析三种调节模式的稳定条件,并结合实际算例对比分析不同因素对三种调节模式稳定域的影响。结果表明：频率调节和功率调节都是有条件稳定的,并且前者的稳定域远小于后者,而开度调节则是无条件稳定的。功率调节的稳定性品质明显优于频率调节。
英文摘要：
Small fluctuation stability in a hydropower station＇s actual operation concems the quality of transient process, and it would have great limitation if we use a single frequency regulation mode for small fluctuations. On the premise of artificial dead band not considered, a homogeneous differential equation that contains pressure pipeline＇s water flow inertia of frequency regulation mode, power regulation mode, and servomotor stroke regulation mode, are derived in this paper. Then, stability conditions for these three regulation modes are analyzed and impacts of different factors on the stability domain of each regulation mode are demonstrated through an engineering case study. The results show that frequency regulation mode and power regulation mode are both conditionally stable and the former has a stability domain much smaller than the latter, but servomotor stroke regulation mode is unconditionally unstable. The quality of power regulation mode stability is obviously better than that of frequency regulation mode.
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