The upgrade of a pumped-storage power plant (PSPP) to allow variable speed operation offer several advantages in pumping and generating modes. However, in pumping mode at part load, both pressure and torque pulsations develop in the pump turbine runner. This paper evaluates the risk of fatigue damage in the penstock of a variable-speed PSPP due to the propagation of the pressure pulsations developing in the pump turbine runner at partial load in pumping mode. For that purpose, a simulation model of a variable-speed PSPP has been developed. The pressure and torque pulsations are generated each from a different set of sinusoidal functions calibrated from the results of a Computational Fluid Dynamic model, which was in turn validated from experimental data. A Monte Carlo simulation has been performed considering different temporal gaps between the sinusoidal functions reproducing the pressure pulsations in one and another pump turbine. The number of stress cycles that may cause fatigue damage in the penstock has been obtained from the results of the simulations and the fatigue curves defined in the Eurocode, and then transformed into the maximum number of hours per year the PSPP can operate at partial load in pumping mode to avoid fatigue damages.

中文翻译：

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在抽水模式下变速运行的抽水蓄能发电厂的压力管道疲劳风险

抽水蓄能电站 (PSPP) 的升级以允许变速运行在抽水和发电模式方面具有多项优势。然而，在部分负载的泵送模式下，泵涡轮中会产生压力和扭矩脉动。本文评估了变速 PSPP 压力管道中疲劳损坏的风险，因为压力脉动在泵送模式下部分负载下在泵涡轮转轮中产生。为此，开发了变速 PSPP 的仿真模型。压力和扭矩脉动分别由一组不同的正弦函数生成，这些正弦函数根据计算流体动力学模型的结果进行校准，该模型又从实验数据中得到验证。考虑到再现一个和另一个泵涡轮中的压力脉动的正弦函数之间的不同时间间隙，已经执行了蒙特卡罗模拟。从模拟结果和欧洲规范中定义的疲劳曲线中得到可能导致压力管道疲劳损坏的应力循环次数，然后转化为 PSPP 在部分负载下每年可以运行的最大小时数泵送模式，以避免疲劳损坏。