水力发电机组甩负荷过渡过程的参数敏感性分析

Parameter Sensitivity Analysis of Transition Process for Hydraulic Generating Set

以国内某水电站为对象,在不确定框架下构建了水力发电机组甩负荷过渡过程的数学模型。并以此模型为基础,引入扩展傅里叶幅度检验法量化输入参数对系统响应的影响,获得了机组在甩负荷过渡过程中输入参数相对于转速、水击压力以及调压室涌浪的敏感性特性。可以得到飞轮力矩对转速最大上升值的影响最为显著。同时,也可以发现各参数的不确定度会明显影响对水击压力的敏感性,而不会影响对调压室涌浪的敏感性。

Taking a hydropower station in China as an example,a mathematical model of load rejection process of hydroelectric generating units is constructed under the uncertain framework.Based on this model,an Extended Fourier Amplitude Sensitivity Test is introduced to quantify influences of input parameters on the system response,and sensitivity characteristics of input parameters relative to the rotational speed,water hammer pressure and surge in the surge-chamber during the load rejection transition are obtained.It can be concluded that the flywheel torque has the most significant effect on the maximum speed appreciation.At the same time,it can be found that the uncertainty of each parameter will obviously affect the sensitivity to the water hammer pressure,but will not affect the sensitivity to the surge in the surge chamber.