Calculated results of inertia moment of turbo-generator rotor can be quite different by methods used in load rejection tests. In view of fluctuation features of rotor speed rise curve during load rejection tests, the ...Calculated results of inertia moment of turbo-generator rotor can be quite different by methods used in load rejection tests. In view of fluctuation features of rotor speed rise curve during load rejection tests, the measurement principle of rotor inertia moment was expounded. Based on the measured data in load rejection tests for an imported type of domestic 300-MW generating unit, the rotor speed rise curve was fitted with three kinds of functions to get initial runup rate, but the obtained results differed a lot from each other. According to analysis on the mechanism of rotor speed rise, m=2 consecutive points averaging or FFT (Fast Fourier Transform) smoothing technology was introduced to process test data, and then the initial runup rate was determined by the method of linear fitting of rotor speed in the range of governing valve closing time. Although the obtained curves had a fluctuating shape, the results of rotor inertia moment for 50% and 100% load rejection tests were of good consistency.展开更多
通过甩负荷试验测取汽轮发电机转子转动惯量的计算方法不一,结果差别较大。针对甩负荷试验转子飞升曲线波动的特点,论述了汽轮发电机转子转动惯量测取原理。以某国产引进型300 M W机组甩负荷试验的实测数据为基础,对转速飞升曲线采用3...通过甩负荷试验测取汽轮发电机转子转动惯量的计算方法不一,结果差别较大。针对甩负荷试验转子飞升曲线波动的特点,论述了汽轮发电机转子转动惯量测取原理。以某国产引进型300 M W机组甩负荷试验的实测数据为基础,对转速飞升曲线采用3类函数进行了拟合,求取转子的初始飞升速率,但结果差别很大。在对转子飞升过程机理分析的基础上,提出了采用2点邻近点平均或快速傅立叶FFT滤波(平滑)对数据进行处理,再用调节汽门延迟关闭时间范围内转速线性拟合的方式求取转速初始飞升速率。该方法得到的曲线仍然呈现波动,但对甩50%和100%负荷试验计算的转子转动惯量取得很好的一致性。展开更多
文摘Calculated results of inertia moment of turbo-generator rotor can be quite different by methods used in load rejection tests. In view of fluctuation features of rotor speed rise curve during load rejection tests, the measurement principle of rotor inertia moment was expounded. Based on the measured data in load rejection tests for an imported type of domestic 300-MW generating unit, the rotor speed rise curve was fitted with three kinds of functions to get initial runup rate, but the obtained results differed a lot from each other. According to analysis on the mechanism of rotor speed rise, m=2 consecutive points averaging or FFT (Fast Fourier Transform) smoothing technology was introduced to process test data, and then the initial runup rate was determined by the method of linear fitting of rotor speed in the range of governing valve closing time. Although the obtained curves had a fluctuating shape, the results of rotor inertia moment for 50% and 100% load rejection tests were of good consistency.
文摘通过甩负荷试验测取汽轮发电机转子转动惯量的计算方法不一,结果差别较大。针对甩负荷试验转子飞升曲线波动的特点,论述了汽轮发电机转子转动惯量测取原理。以某国产引进型300 M W机组甩负荷试验的实测数据为基础,对转速飞升曲线采用3类函数进行了拟合,求取转子的初始飞升速率,但结果差别很大。在对转子飞升过程机理分析的基础上,提出了采用2点邻近点平均或快速傅立叶FFT滤波(平滑)对数据进行处理,再用调节汽门延迟关闭时间范围内转速线性拟合的方式求取转速初始飞升速率。该方法得到的曲线仍然呈现波动,但对甩50%和100%负荷试验计算的转子转动惯量取得很好的一致性。