The analysis of hydraulic disturbance is an important part of the analysis of the hydraulic transient process of a hydropower station. This paper introduces the relationship between the grid-connected operation mode of the power station and the hydraulic disturbance by the power station system, and performs simulation calculations under the same boundary conditions according to the hydraulic disturbance test cases, and predicts the extreme control conditions which provides the basis for the safe operation of the power station. It also provides reference for the design and calculation of similar projects.
This paper used the state space method to establish a stability analysis model of a hydroturbine governing system (HTGS) coupled with a water diversion system. The stability characteristics of different regulating regions (RRs) were studied according to the eigenvalues of the system, and they were verified by numerical simulations in the time domain. The dynamic system responses and dominating factors were analyzed for governor parameters selected in different domains of the RRs. In addition, an intermediate unstable RR was discovered and its influencing factors were investigated. The results show that the unstable RR occurs because of the interaction between the oscillations in the HTGS and surge tanks and indicate that the system performance varies in different domains of the RR, with better performance observed in domain II. Then, a comprehensive critical stable area is observed in the surge tank based on the effect of the turbine, governor and water inertia, and a specific instance of the traditional Thoma stable area is observed in the proposed area. Either reducing the cross-sectional area of the surge tank and head loss coefficients of the headrace tunnel or increasing the water inertia of the water diversion system can increase the unstable RRs.
Accurate simulation of hydraulic transients is crucial and complicated in the design of hydropower station and pumped storage power station. In this paper, key technologies for hydraulic transient simulation calculation in complex water conveyance system were studied. The structural matrix method with advantages of high accuracy and fast speed for numerical calculation was introduced. Complicated elements in the conveyance system were refined, such as high precision simulation of differential surge chamber, simulation of long and narrow upper chamber, new interpolation method for characteristic curve of pumped storage unit. Based on Jinping II hydropower station with special long headrace system and differential surge chamber, Baihetan hydropower station with complex tailrace system and large surge chamber and Xianyou pumped storage power station with complex unit characteristics and various working conditions, the application of the simulation software HYSIM in field test and inversion calculation was illustrated. The paper providing references for the design of similar projects.
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