Kaplan turbine adjusting system dynamic model suitable for electric power system analysis

Abstract

The invention discloses a Kaplan turbine adjusting system dynamic model suitable for electric power system analysis, which comprises a speed governor model, a guide vane control system model, a blade control system model, a water turbine model and a water diversion system model, wherein the guide vane control system model and the blade control system model forms a Kaplan turbine dual adjusting system, the blade control system model takes a combined relationship existing between guide vane opening degrees and blade opening degrees into account, and the combined relationship is obtained by adopting a quintic polynomial curve fitting method; and the water turbine model takes the correction function of blade angles on water turbine efficiency into account on the basis of analyzing non-linear models, the mechanical power output of the water turbine model is affected by the guide vane opening degrees and blade opening degrees together, and the nonlinearity between the guide vane opening degrees and the mechanical power is metered and is described by adopting cubic polynomial fitting. The Kaplan turbine adjusting system dynamic model is exquisite and clear in structure, has distinct and easily-obtained model parameter meanings, is fast and efficient in modeling process, and has high practicability.

Description

technical field [0001] The invention relates to the technical field of hydroelectric power generation and electric system modeling, in particular to a dynamic model of a paddle water turbine regulating system suitable for electric system analysis. Background technique [0002] The establishment of prime mover and governor models that can represent the actual characteristics of the speed control system is an important basis for improving the accuracy of power grid security and stability analysis and system operation guidance. The paddle turbine adopts double regulation of guide vane and blade to improve power generation efficiency. It is one of the common forms of water turbine in my country and occupies an important position in hydropower generation. The accuracy of the description of the dynamic behavior of the paddle turbine in the calculation of the power system will have a certain impact on the analysis results of the power system. [0003] In the existing power system ...

AI Technical Summary

Problems solved by technology

In the existing research, the motion law of the guide vanes and blades of the double-adjusting turbine when they are associated and non-associated is modeled using modularization; the relationship between the guide vanes and blades is calculated using polynomial interpolation and fitting, neural network and other methods; the associated characteristics between guide vanes and blades can be characterized by a linear relationship, and the turbine model uses an analytical nonlinear model, but the accuracy of the turbine output mechanical power needs to be improved

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