Pressure conduit circuit equivalence analogy method in course of hydropower station transition

Abstract

The invention relates to a circuit equivalent simulation method for a pressure conduit in an electric system hydraulic power station, belonging to the hydraulic power station water power system modeling field. The method comprises the following steps that: an unsteady flow transfer matrix is obtained through analysis and calculation of an unsteady flow equation in the pressure conduit, and the transfer matrix is the same with a forward transmission equation of a uniform transmission facility which ignores the conductance to earth, thereby a pi-shaped equivalent circuit model of the uniform pressure conduit can be established according to the two-port theory. Pressure diversion conduits with different lengths are equivalent by adoption of one or a plurality of pi-shaped circuit models, thereby an equivalent point network model of the whole diversion conduit is obtained. The circuit equivalent simulation method can be used for quick modeling of the pressure conduit and is convenient for a system researcher to establish a model of a whole water power system so as to research interaction between hydroelectric power and electromechanical power during the transient process of the hydraulic power station. Moreover, water hammers of different types and pressure steel pipes of different lengths during the transient process of the hydraulic power station are simulated by adoption of the method, and both principle analysis and simulation indicate that the method is correct and effective.

Description

Technical field [0001] The invention relates to a circuit equivalent simulation method of a pressure pipeline in a power system hydropower station, and belongs to the field of hydropower system modeling of a hydropower station. Background technique [0002] my country has numerous rivers and river runoffs, and has abundant hydropower resources. With the rapid growth of national demand for electricity, the development of hydropower stations in my country is quite rapid. At present, a number of large hydropower stations are under construction or are about to start on the main and tributary streams of the upper and middle reaches of the Yangtze and Yellow Rivers. Due to the rapid start-up, fast output adjustment, and flexible operation of the hydro-generator set, it is the best peak, frequency, and accident backup power supply in the power system [1] . At the same time, due to its significant advantages, the development process of hydropower stations will continue to accelerate. [...

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Problems solved by technology

However, literature [10-11] analyzed different water hammer models and pointed out that if the pressure pipe water hammer model is used improperly, it will not be able to correctly reflect the actual situation of the system.

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