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A Prediction of the Transient Phenomena by the Load Rejection for a 50MW Francis Hydropower Plant
조태영,고성호,조 용,배강호 한국유체기계학회 2022 한국유체기계학회 논문집 Vol.25 No.2
Generally, hydropower operates in a steady state when generating power. However, transient operations such as start-up and shut-down operations can trigger unsteadiness, which may cause accidents in severe cases. Therefore, hydropower plants include a protection device, such as a surge tank, and verifies the opening time of the guide vane at the design stage. To replace parts, such as runners for increasing the performance of the hydropower plant, sufficient verification is required. This study involves various transient operations in a Francis hydropower plant modeled using the 1-D Analysis (SIMSEN) software, which was developed for the simulations of hydraulic systems. During the simulations, the safety at power plants was examined by assessing the changes in the water level of a surge tank. Via simulations, it was verified that it operates stably even when an emergency shutdown occurs while the reservoir level is increased to the maximum. In addition, the surge tank reduced the maximum value of the head at the penstock before the turbine by 31.6% compared to that without a surge tank.