Sliding pressure setting curve real-time optimization method considering back pressure correction and optimal valve position
A technology of setting curve and optimization method, applied in the direction of comprehensive factory control, electrical program control, comprehensive factory control, etc., can solve the problems of rising coal consumption and declining unit operation economy, so as to reduce the coal consumption of power supply, realize comprehensive optimization, Realize the effect of valve management
Pending Publication Date: 2022-07-01
国家电投集团江西电力有限公司
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During the operation of the unit, the original sliding pressure curve will not be the optimal sliding pressure curve due to various reasons such as the back pressure deviates from the design working condition. Decrease, increase in coal consumption
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[0014] The real-time optimization value ΔP of the sliding pressure setting curve of thermal power units consists of two parts, one part is the back pressure correction value ΔP obtained from the difference between the current actual back pressure of the unit and the back pressure of the design condition. 1 , the other part is calculated by the optimal valve position holding controller to obtain the valve position correction amount ΔP 2 , and finally ΔP=f(MWD)·ΔP 1 +ΔP 2 , where f represents a functional relationship, and MWD represents the current load command of the unit.
[0015] The back pressure correction amount ΔP 1 Calculate according to the following method: the first step, according to the experimental data of different load sections, fit ΔP 1 with ΔP b The quantitative relationship of (g(.) is a proportional function), the fitting result is ΔP 1 =0.131ΔP b ; The second step, determine the load command correction coefficient f (MWD), see Table 1. How to use Tab...
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The invention discloses a sliding pressure setting curve real-time optimization method considering back pressure correction and an optimal valve position. The real-time optimization quantity delta P of the sliding pressure setting curve of the thermal power generating unit is composed of two parts, one part obtains the back pressure correction quantity delta P1 through the difference value between the current actual back pressure of the unit and the back pressure of the design working condition, the other part obtains the valve position correction quantity delta P2 through calculation of the optimal valve position keeping controller, the real-time optimization quantity delta P is equal to f (MWD) * delta P1 + delta P2, the function relation is represented, and the function relation is a function relation. The MWD represents a current load instruction of the unit; firstly, a corresponding back pressure correction value is obtained according to the difference value between the current actual back pressure of a unit and the back pressure of the design working condition, then the valve position correction value is obtained based on steam turbine optimal valve position feedback control, comprehensive optimization of steam turbine valve management is achieved through real-time optimization of a sliding pressure setting curve, and on the premise that daily production requirements are met, the optimal valve position correction value is obtained. And the power supply coal consumption of the unit is effectively reduced.
Description
technical field [0001] The invention relates to automatic control of thermal power units, in particular to a real-time optimization method for a sliding pressure setting curve considering back pressure correction and optimal valve position, and belongs to the field of thermal control. Background technique [0002] At present, most thermal power units operate in a "fixed-slid-fixed" compound sliding pressure mode, and the sliding pressure setting value is an interpolation function of the load command. During the operation of the unit, the original sliding pressure curve will not be the optimal sliding pressure curve due to various reasons such as the deviation of the back pressure from the design conditions. decreased, coal consumption increased. Therefore, it is necessary to consider the influence of the back pressure change on the optimal sliding pressure setting value. At the same time, the main steam pressure of the unit affects its thermal cycle efficiency, and the two...
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IPC IPC(8): G05B19/418
CPCG05B19/41865G05B2219/32252Y02P90/02
Inventor 权星军夏立国郑辉朱继涛凌学超熊辉石晓玲俞艳霞高佳黄静
Owner 国家电投集团江西电力有限公司