Method for optimizing flow characteristics of high-regulation valve of steam turbine based on transient data of small sample
A technology of flow characteristics and optimization methods, applied in mechanical equipment, engine components, machines/engines, etc., can solve problems such as unfavorable unit safety, economic operation, fluctuation of main steam parameters, frequent vibration of high-profile doors, etc.
Inactive Publication Date: 2020-02-21
INNER MONGOLIA POWER GRP
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[0003] Unit load control is usually accomplished by the steam turbine digital electro-hydraulic control system (DEH system). The linearity deviation of the valve flow characteristic curve of the DEH system is too large, which will not only increase the response time of the unit to the load, but also easily cause The frequent oscillation of the high-profile valve leads to the deterioration of the unit load adjustment speed and adjustment accuracy performance, the fluctuation of the main steam parameters, and the fatigue damage of the valve actuator increases, which affects the assessment indicators of the two detailed rules of the power grid, which is not conducive to the safe and economical operation of the unit
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[0015] A steam turbine high-profile door flow characteristic optimization technology based on small-sample transient data described in the patent of the present invention includes the following steps:
[0016] The first step: small sample transient data collection. Utilize the historical data stored in the DCS to select the continuously variable load data segment of the unit load within the interval of 50%-100%; as shown in Table 1, the patent acquisition parameters of the present invention include: unit power, main steam flow, main steam pressure, Main steam temperature, regulating stage pressure, high pressure cylinder exhaust pressure, high pressure cylinder exhaust temperature, total valve opening, GV1 valve opening, GV2 valve opening, GV3 valve opening, GV4 valve opening.
[0017] Adoption cycle: 1 second.
[0018] The second step: Use the isolated deep forest algorithm to check and eliminate the outliers in the small sample data, and use the linear difference method to ...
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The present invention discloses a method for optimizing flow characteristics of a high-regulation valve of a steam turbine based on transient data of a small sample. The method includes the steps: sampling the transient data during the load-varying process of the steam turbine, and then cleaning and clustering collected data to obtain sample data sets under various load conditions; according to the proportional relation between the regulating-stage pressure of the steam turbine and the steam intake of the steam turbine, amending the steam intake of the steam turbine in the sample data set to obtain the steam intake of the steam turbine under the same boundary conditions; and finally using a least-square fitting algorithm to carry out linearized fitting to the steam intake flow and the mainvalve command, and amending the flow characteristic curve of the high-regulation valve of the steam turbine in combination with the relation between the original flow and the valve command, to obtainthe steam distribution curve of each high-regulation valve of the linearized steam turbine.
Description
technical field [0001] The patent of the invention belongs to the technical field of steam turbine operation optimization, and relates to a steam turbine high-profile door flow characteristic optimization technology based on small-sample transient data. Based on the transient data of a small sample of the unit, through data cleaning, cluster analysis and steam flow correction and other technologies, the linearity of the high-speed gate of the steam turbine is optimized, which can effectively improve the dynamic regulation performance of the steam turbine, improve the unit load control accuracy and primary frequency regulation Control quality. Background technique [0002] With the massive access of new energy such as wind energy and solar power, in order to ensure the stability of grid load and frequency, and to stabilize the impact of random fluctuations on grid security, conventional coal-fired generators need to frequently participate in grid peak regulation and frequency...
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IPC IPC(8): F01D17/14F01D17/24F01D21/00
CPCF01D17/145F01D17/24F01D21/00F01D21/003
Inventor 霍红岩于海存辛晓钢张谦秦成果张国斌殷建华范志强周磊郭瑞君杜荣华赵炜王立红李荣丽
Owner INNER MONGOLIA POWER GRP