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本文对四个水电站的调节稳定曲线进行了计算,考虑了水轮机特性和调压井断面积的影响,以及电站的各种布置.布置包括了不设井的单机单管、对称并联、和设有调压井的情况.计算取负荷自调节系数为1和0,取水轮机为真实的和理想的,并取判定条件式为高阶及低阶的.对由此所得到的各种稳定曲线进行了比较研究.指出当应用理想水轮机作为简化计算的假设时,必须特别小心.当用于有调压井的情形,它可能有大的错误,即调压井面积越大,系统越不稳定.但对真实水轮机计算结果则反是,符合实际.当用于无调压井的情形,理想水轮机的假设仅在机组对管道时间常数之比为大值时误差不大,为可行的.文中还指出稳定曲线与曲线之间变化很大,影响稳定性的因素很多,应按照具体条件并作全面考虑,对稳定曲线进行计算,所得结果才能准确.为此给出了计算通式,包含了14个或11个影响参量,是稳定曲线的精确解式.
In this paper, the regulation stability curves of four hydropower stations are calculated, considering the characteristics of turbines and the influence of surge pipe cross-section area, and the various layout of power station.The arrangement includes the single pipe without wells, symmetrical parallel connection, Surge case: The calculation of load self-regulation coefficients of 1 and 0 and the take-up turbine is true and ideal, and the judgment condition is high order and low order. The stability curves thus obtained are subjected to A comparative study shows that extreme caution must be exercised when applying ideal turbines as a simplifying calculation, and when used in a surge tank, there may be a big mistake that the larger the surge tank area, the more unstable the system. However, the calculation results of the actual turbine are in accordance with the actual situation.When used in the case of no surge shaft, the assumption of the ideal turbine is feasible only when the ratio of the unit to the pipeline time constant is not large. It is pointed out that there are many factors that affect the stability of the stable curve and the curve, and the stability curve should be calculated according to the specific conditions and fully considered, and the result obtained is accurate. A 11 influencing variables, exact solutions are stable curve formula.