长引水式水电站小波动影响因素分析

摘要

基于一维瞬变流理论,采用考虑水体弹性的特征线法对长引水式水电站小波动过渡过程的影响因素进行了数值模拟.结合某一具体的工程算例,分析了调压室面积、阻抗孔面积、电网负荷自调节系数以及调速器参数对小波动特性的影响.相应的计算结果表明:对于长引水式水电站,调压室面积越大,小波动稳定性越好,满足小波动稳定性所需调压室断面积应大于托马临界稳定断面;阻抗口面积越小,越有利于改善小波动的调节品质;电网负荷特性能显著改善小波动稳定性及调节品质;在满足小波动稳定性的前提下,调速器参数取值越小,小波动调节品质越好.%Based on the one-dimensional transient flow theory,a numerical simulation of the influence factors of the small fluctuation of long diversion hydropower stations is conducted by using the characteristic line method which considers the water elasticity.The effects of the area of surge chamber,the area of impedance hole,the self regulating coefficient of power network load and the parameters of the governor on the small fluctuation are analyzed by using a specific engineering case study.The corresponding calculation results show that the larger the area of surge chamber,the better the stability of small fluctuations;The area of surge chamber meeting the stability of small fluctuations should be larger than Thomas stability section The smaller the impedance hole area is,the more conducive to improving the quality of small fluctuations.The grid load properties can improve the stability and the regulation quality of small fluctuation notablely.The smaller governor parameteris,the better regulation quality of small fluctuation under the premise of satisfying the small fluctuation stability.