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采用状态空间法对某尾水管道在室后交汇布置形式的水电站进行了水力机械系统小波动稳定性分析,同时利用考虑水体弹性的特征线法对相同工况进行数值模拟,两者相互验证结果基本一致。随后在保证系统稳定的条件下,针对小波动,研究阻抗孔面积对系统调节品质的影响。结果表明,对于该类布置形式的电站系统,随着尾水调压室阻抗孔面积的减小,机组转速的调节时间减少,调压室涌浪波动振幅呈降低趋势;在满足大波动调节保证要求的条件下,适当减小阻抗孔面积,有利于改善系统调节品质。
The state space method was used to analyze the small-wave stability of hydropower system in a hydropower station with a tail-water pipe intersecting at the back of the room. Simultaneously, the same working conditions were numerically simulated by using the characteristic line method which considers the elasticity of water body. Basically the same. Subsequently, under the condition of ensuring system stability, the influence of impedance hole area on the quality of system adjustment was studied for small fluctuations. The results show that with the reduction of the impedance hole area of the tailrace surge chamber, the adjustment time of the unit speed decreases and the surge amplitude of the surge chamber decreases. In the power plant system of this type, The requirements of the conditions, the appropriate reduction of the impedance hole area is conducive to improving the system adjustment quality.