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

The technology of one-type hydraulic turbine and regulating system is applied in the direction of control/regulation system, general control system, adaptive control, etc. It can solve the problem that the mechanical power accuracy of the hydraulic turbine needs to be improved, and achieve short modeling time, strong practicability, and high practicability. Well-defined effects of intrinsic parameters

Active Publication Date: 2015-11-18
WUHAN UNIV
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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

Method used

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

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Embodiment Construction

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] first of all, yes Figure 2-Figure 4 The meanings of each unit module and symbols in the module are explained:

[0046] figure 2 In the model, the deviation between the output of the governor model and the opening of the guide vane is controlled by the PID (proportional-integral-derivative) control of the auxiliary loop and the speed limiting link, amplitude limiting link and integral action of the guide vane servomotor to realize the control of the guide vane opening. degree of control; image 3 In the above, after the guide vane opening value passes through the measurement link and the associated relationship between the guide vane opening and the blade opening, the deviation between it and the blade opening is passed through the proportional control and the speed limiting link of the blade servomotor, The limiting link a...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
Inventor 赵洁王力刘涤尘王骏赵语刘田
Owner WUHAN UNIV
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