
水力发电机组甩负荷过渡过程的参数敏感性分析
谢卓健, 闫懂林, 肖汉, 麦先春, 王峻峰, 陈启卷
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.
水力发电机组 / 甩负荷 / 全局敏感性 / 扩展傅里叶幅度检验法 {{custom_keyword}} /
hydroelectric generating set / load shedding / global sensitivity / Extended Fourier Amplitude Sensitivity Test {{custom_keyword}} /
表1 仿真参数Tab.1 Simulation parameters |
参数 | 符号 | 值 |
---|---|---|
机组飞轮力矩/(t·m2) | GD 2 | 65 000 |
调压室阻抗孔面积/m2 | As 1 | 58.205 |
调压室第一段面积/m2 | As 2 | 801.975 |
调压室第二段面积/m2 | As 3 | 2 280.975 |
调压室第三段面积/m2 | As 4 | 2 562 |
调压室流入系数 | r 1 | 3.564e-5 |
调压室流出系数 | r 2 | 3.564e-5 |
引水隧洞波速/(m·s-1) | a 1 | 1 100 |
引水隧洞摩擦系数 | f 1 | 0.03 |
引水隧洞面积/m2 | A 1 | 162.163 9 |
调压井至钢管下平段首波速/(m·s-1) | a 2 | 1 166.667 |
调压井至钢管下平段首摩擦系数 | f 2 | 0.02 |
调压井至钢管下平段首面积/m2 | A 2 | 74.365 2 |
钢管下平段首至机组段波速/(m·s-1) | a 3 | 1 065 |
钢管下平段首至机组段摩擦系数 | f 3 | 0.005 |
钢管下平段首至机组段面积/m2 | A 3 | 52.738 9 |
尾水管段波速/(m·s-1) | a 4 | 1 025 |
尾水管段摩擦系数 | f 4 | 0.01 |
尾水管段面积/m2 | A 4 | 62.841 1 |
尾水管延伸段波速/(m·s-1) | a 5 | 1 107.33 |
尾水管延伸段摩擦系数 | f 5 | 0.044 |
尾水管延伸段面积/m2 | A 5 | 141.761 8 |
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