Study of Hydraulic Disturbance of Pumped Storage Unit

Li, Gaohui; Wu, Xumin; Cui, Weijie; Qiu, WeiXin; Zhou, Tianchi

doi:10.1088/1755-1315/768/1/012010

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“…The dynamic response process of the pump-turbine was studied by using the nonlinear dynamic characteristics such as time domain diagram and phase trajectory diagram obtained from simulation [22][23][24][25][26]. By comparing and analyzing the dynamic responses for linear model and nonlinear model under load disturbance [27][28][29][30], the dynamic change law and characteristics of the system are further analyzed, which provides theoretical basis and scientific guidance for further research on nonlinear model of pump-turbine [9]. The establishment of a mathematical model for a hydraulic turbine generally has the following steps.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Modeling of Dynamic Characteristics of Pump-Turbine

2022

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Hydropower is a kind of clean energy, which can effectively reduce the consumption of fossil energy and is one of the main fields of new energy development. Pumped storage power station not only provides a solution for storing electric energy and generating excess, but also is a clean, efficient, economical and safe power system regulation method with high quality. Accurate modeling of a pump-turbine, as the core equipment of a pumped storage unit, is the key to safe and stable operation of the pumped storage unit. At present, a method of simplifying the external characteristics of a pump-turbine into a first-order linear model is widely used, which cannot effectively and accurately reveal the nonlinear dynamic characteristics of the unit in transition process. In order to meet the demand of high-precision simulation of the unit, a new method of identifying Taylor series expansion considering nonlinearity based on the torque characteristic formula and the flow characteristic formula is proposed, which is applied to the pump-turbine external characteristic model, and retains the second derivative term, making the model a second-order nonlinear model, and thus, the pump-turbine model becomes a nonlinear model. The nonlinear model established is used to simulate the load increase and load rejection of the unit, and the results are compared with those for the linear model. The comparison shows that the nonlinear model established for the pump-turbine can reveal the dynamic response of the unit more effectively and accurately than the linear model, and provide a further guarantee for the safe and stable operation of pumped-storage units, which is of great significance to hydropower energy development.

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