应用阻尼坎的大型水电机组有功振荡抑制方法

Active power oscillation suppression method of large hydropower unit with damping sill

电力系统稳定关系电网安全,基于增设无压明渠可增大水力阻尼原理,以大型水电机组为研究对象,针对尾水渠道压力脉动引起的有功振荡问题,建立阻尼梯形坎模型,利用FLUENT软件,采用标准的k-ε模型与VOF多相流模型,进行仿真计算,其结果应用一某大型水电机组,并开展现场试验分析。结果表明:所提出的抑制方法可以显著降低有功振荡幅值,满足电网对大型水电机组稳定运行的要求。这对解决电力系统有功振荡研究有工程指导价值。

The stability of power system is related to the security of power grid.Here,based on the principle of adding non-pressure open channel being able to increase hydraulic damping,taking a large hydropower unit as the study object,aiming at the problem of active power oscillation caused by pressure fluctuation in tailrace channel,the damping trapezoidal sill model was established.The standard k-εmodel and VOF multiphase flow model were adopted,and the software FLUENT was used to do simulation calculation,and the simulation results were applied in the large hydropower unit.The field tests and analysis were performed.The results showed that the proposed suppression method can significantly reduce amplitude of active power oscillation,and meet requirements of power grid for stable operation of large hydropower unit;the study results have engineering guiding value to solve the active power oscillation problem in power system.