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Steam turbine model modification method taking main steam pressure influences into consideration

A main steam pressure, model correction technology, applied in simulators, instruments, control/regulation systems, etc., to achieve high-precision results

Inactive Publication Date: 2015-07-29
ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD +2
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Problems solved by technology

[0005] Purpose of the invention: In order to solve the problem of the influence of the main steam pressure on the simulation of the steam turbine model in the current method, and to realize the accuracy of the simulation results of the steam turbine model under low-frequency oscillation research, the present invention proposes a steam turbine considering the influence of the main steam pressure Model Correction Method

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] In practice, the actual system structure is complex, modeling is the process of abstracting the actual structure into a mathematical model, there must be some simplification, as long as the established mathematical model can meet the corresponding research purpose, then the established model is accurate, that is In other words, to study the low-frequency oscillation problem of the power system, the frequency of the low-frequency oscillation of the power grid is generally in the range of 0.1Hz to 2.5Hz. The model accuracy requirement is very low.

[0029] The inertial time constant of the boiler is generally above 100s, which is far beyond the frequency fluctuation range of the low-frequency oscillation. Therefore, when studying the low-frequency oscillation problem, the dynamic pair of the scale of the boiler can be ignored; however, when the steam turbine valve...

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Abstract

The invention discloses a steam turbine model medication method taking main steam pressure influences into consideration, which is characterized by comprising the steps of establishing a traditional steam turbine model and a steam turbine model taking influences imposed on a system by main steam pressure, drawing Bode diagrams of the two models respectively, carrying out frequency-domain analysis on the two models, acquiring the amplitudes k1, k2 corresponding to any frequency of amplitude-frequency characteristics of the two models in a range of 0.1-2.5Hz, acquiring a main steam pressure modification factor k2=10<(K2-K1) / 20>, and acquiring a transfer function, which is shown in the description, of the steam turbine model after the main steam pressure factor is added. According to the invention, the main steam pressure modification factor is introduced, a problem that the main steam pressure causes influences for the steam turbine model is solved, the modified steam turbine model is ensured to have high precision in a low-frequency oscillation problem, and the accuracy of a simulation result of the steam turbine model under low-frequency oscillation research is realized.

Description

technical field [0001] The invention relates to the technical field of generators, in particular to a steam turbine model correction method considering the influence of main steam pressure. Background technique [0002] In the power system, when the generator sets run in parallel through the transmission line, the relative swing between the generator rotors will occur under the disturbance, and cause continuous oscillation in the absence of damping. At this time, the power on the transmission line will also oscillate correspondingly, because of its oscillation frequency Low, generally 0.1 ~ 2.5Hz, so it is called low frequency oscillation. The phenomenon of low frequency oscillation is one of the main manifestations of small disturbance stability. With the expansion of the grid interconnection scale, the widespread adoption of high-magnification fast excitation technology, and the operation of the grid under the influence of economical and environmental factors is closer to...

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Application Information

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IPC IPC(8): G05B17/02
Inventor 刘金福邓彤天李小军赵鑫宇刘娇王家胜钟晶亮
Owner ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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