Self-adaptive pre-coal-feeding method and system applied to AGC-R mode of thermal power generating unit
阅读说明：本技术 应用于火电机组agc-r模式的自适应预投煤方法及系统 (Self-adaptive pre-coal-feeding method and system applied to AGC-R mode of thermal power generating unit ) 是由 陈超 邹毅辉 易晓坚 刘丹 于 2019-10-09 设计创作，主要内容包括：本发明公开了一种应用于火电机组AGC-R模式的自适应预投煤方法,包括以下步骤：1)计算预投煤量Y,所述预投煤量Y的计算公式为Y＝F(X)<Sub>1</Sub>*F(X)<Sub>2</Sub>*F(X)<Sub>3</Sub>,2)计算预投煤时间T,预投煤时间T的计算公式为T＝F(X)<Sub>4</Sub>；3)控制系统根据预投煤量Y和预投煤时间T进行投煤控制。还包括一种一种应用于火电机组AGC-R模式的自适应预投煤系统,包括控制系统,所述控制系统应用上述自适应预投煤方法。通过预投煤时间T和预投煤量Y的计算,使得机组在增减负荷过程中可以对增减煤量提前预判,缩短锅炉燃烧率的响应时间,提高机组协调变负荷能力,避免机组在AGC-R模式下大幅度变负荷引起机组主汽压力波动,使机组在AGC-R模式模式下各项参数安全稳定运行。(The invention discloses a self-adaptive pre-coal-feeding method applied to an AGC-R mode of a thermal power generating unit, which comprises the following steps: 1) calculating a pre-coal-feeding amount Y, wherein the calculation formula of the pre-coal-feeding amount Y is that Y is F (X) 1 *F(X) 2 *F(X) 3 And 2) calculating the pre-coal-throwing time T, wherein the pre-coal-throwing time T is calculated according to the formula of T ═ F (X) 4 (ii) a 3) And the control system performs coal feeding control according to the pre-coal feeding amount Y and the pre-coal feeding time T. The self-adaptive pre-coal-feeding system applied to the AGC-R mode of the thermal power generating unit comprises a control system, and the control system applies the self-adaptive pre-coal-feeding method. By calculating the pre-coal-feeding time T and the pre-coal-feeding quantity Y, the unit can prejudge the coal quantity increase and decrease in advance in the load increasing and decreasing process, the response time of the boiler combustion rate is shortened, the load capacity of the unit in cooperative regulation is improved, the main steam pressure fluctuation of the unit caused by large load change of the unit in an AGC-R mode is avoided, and various parameters of the unit can safely and stably run in the AGC-R mode.)
1. A self-adaptive pre-coal-feeding method applied to an AGC-R mode of a thermal power generating unit is characterized by comprising the following steps:
1) calculating a pre-coal-feeding amount Y, wherein the calculation formula of the pre-coal-feeding amount Y is that Y is F (X)1*F(X)2*F(X)3Said F (X))1The output constructed by the difference value obtained by subtracting the actual value of the load instruction after speed limit from the target value of the load instruction is a broken line function of the estimated coal injection amount, wherein F (X)2The output constructed for the difference of the main steam pressure set value minus the main steam pressure actual value is a broken line function of the first pre-coal-throwing amount correction coefficient, F (X)3The output constructed for the difference between the steam turbine energy demand value and the actual boiler calorific value is a broken line function of a second pre-coal-feeding amount correction coefficient;
2) calculating the pre-coal-throwing time T, wherein the formula of the pre-coal-throwing time T is F (X)4Said F (X)4The output constructed by subtracting the actual value of the load instruction after speed limiting from the target value of the load instruction is a broken line function of the time variable;
3) and carrying out coal feeding control according to the pre-coal feeding amount Y and the pre-coal feeding time T.
2. The adaptive pre-coal-charging method applied to the AGC-R mode of the thermal power generating unit according to claim 1, characterized by comprising the following steps: the calculation formula of the difference between the steam turbine energy demand value and the actual boiler calorific value in the step 1) is F (X)3F (Δ e), where Δ e ═ Ps [ (P1/Pt) ×]-[P1+Ck(d(Pd)/dt)](ii) a Wherein P1 is the turbine regulating stage pressure, Ps is the pressure set value Pt is the pressure process value, Pd is the drum pressure, Ck is the heat storage coefficient of the boiler, (P1/Pt) × Ps is the expected input power of the turbine, and P1+ Ck (d (Pd)/dt) is the boiler heat signal HR.
3. The adaptive pre-coal-charging method applied to the AGC-R mode of the thermal power generating unit according to claim 1, characterized by comprising the following steps: the broken line function F (X)1Is valued in a manner of
F(X)1＝-20，m＝-100；
F(X)1＝-15.1，m＝-60；
F(X)1＝-8，m＝-30；
F(X)1＝-4，m＝-10；
F(X)1＝0，m＝0；
F(X)1＝4，m＝10；
F(X)1＝5，m＝30；
F(X)1＝15.1，m＝60；
F(X)1＝20，m＝100；
Wherein m is the difference obtained by subtracting the actual value of the load instruction after speed limit from the target value of the load instruction, F (X)1The unit of the output value is t/h.
4. The adaptive pre-coal-charging method applied to the AGC-R mode of the thermal power generating unit according to claim 1, characterized by comprising the following steps: the broken line function F (X)2Is valued in a manner of
F(X)2＝1.3，n＝-2；
F(X)2＝1.3，n＝-1；
F(X)2＝1.2，n＝-0.6；
F(X)2＝1.1，n＝-0.3；
F(X)2＝1，n＝-0.2；
F(X)2＝1，n＝0；
F(X)2＝1，n＝0.2；
F(X)2＝1.1，n＝0.3；
F(X)2＝1.2，n＝0.6；
F(X)2＝1.3，n＝1；
F(X)2＝1.3，n＝2；
Wherein n is the difference obtained by subtracting the actual value of the main steam pressure from the set value of the main steam pressure, and the unit of n is MPa.
5. The adaptive pre-coal-charging method applied to the AGC-R mode of the thermal power generating unit according to claim 1, characterized by comprising the following steps: the broken line function F (X)3Is valued in a manner of
F(X)3＝1.2，△e＝-0.15；
F(X)3＝1.19，△e＝-0.12；
F(X)3＝1.14，△e＝-0.1；
F(X)3＝1.08，△e＝-0.08；
F(X)3＝1.05，△e＝-0.05；
F(X)3＝1，△e＝0；
F(X)3＝1.05，△e＝0.05；
F(X)3＝1.08，△e＝0.08；
F(X)3＝1.14，△e＝0.1；
F(X)3＝1.19，△e＝0.12；
F(X)3＝1.2，△e＝0.15；
Wherein, delta e is the difference between the steam turbine energy demand value and the actual boiler calorific value, and the unit of delta e is MPa.
6. The adaptive pre-coal-charging method applied to the AGC-R mode of the thermal power generating unit according to claim 1, characterized by comprising the following steps: the broken line function F (X)4Is valued in a manner of
F(X)4＝260，m＝-200；
F(X)4＝260，m＝-100；
F(X)4＝225，m＝-70；
F(X)4＝50，m＝-10；
F(X)4＝30，m＝-5；
F(X)4＝0，m＝0；
F(X)4＝35，m＝5；
F(X)4＝56，m＝10；
F(X)4＝228，m＝70；
F(X)4＝260，m＝100；
F(X)3＝260，m＝200；
Wherein m is the load instruction target value minus the actual value of the load instruction after speed limiting, F (X)4The output value has the unit of s.
7. An adaptive pre-coal-feeding system applied to an AGC-R mode of a thermal power generating unit, which is characterized by comprising a control system, wherein the control system carries out adaptive pre-coal-feeding by applying the method of any one of claims 1-6.
Technical Field
The invention relates to the field of pre-coal-feeding control of a thermal power generating unit, in particular to a self-adaptive pre-coal-feeding method and a self-adaptive pre-coal-feeding system applied to an AGC-R mode of the thermal power generating unit.
Background
In recent years, in order to better consume clean energy such as wind power, photovoltaic and the like, a series of compensation assessment measurement methods and AGC service compensation provisions are successively provided for a power grid, and AGC of a unit running on the power grid is specified to be divided into three modes, namely an AGC normal mode, namely an AGC (automatic gain control) mode, an AGC support mode, namely an A (SCHEA) mode, and an AGC load tracking mode, namely an O (SCHEO) mode. The AGC-R mode has the highest input standard, the highest compensation and the highest load response requirement on the unit, the load of the unit can be adjusted frequently and greatly affects various parameters of the unit in the AGC-R mode, and if the coordination control adjustment of the unit is not timely and the adjustment quality is not good, the important operation parameters of the unit can fluctuate greatly, the unit equipment can be damaged seriously, the unit can trip, and the stability of a power grid is greatly affected.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a self-adaptive pre-coal-charging method and a self-adaptive pre-coal-charging system applied to an AGC-R mode of a thermal power generating unit, which can quickly respond to load change, adapt to the large-amplitude frequent load change of the unit and ensure that all parameters of the unit can safely and stably run in the AGC-R mode.
The self-adaptive pre-coal-feeding method applied to the AGC-R mode of the thermal power generating unit comprises the following steps:
1) calculating a pre-coal-feeding amount Y, wherein the calculation formula of the pre-coal-feeding amount Y is that Y is F (X)1*F(X)2*F(X)3Said F (X)1The output constructed by the difference value obtained by subtracting the actual value of the load instruction after speed limit from the target value of the load instruction is a broken line function of the estimated coal injection amount, wherein F (X)2The output constructed for the difference of the main steam pressure set value minus the main steam pressure actual value is a broken line function of the first pre-coal-throwing amount correction coefficient, F (X)3The output constructed for the difference between the steam turbine energy demand value and the actual boiler calorific value is a polyline function of the second pre-coal-feeding amount correction coefficient.
2) Calculating the pre-coal-throwing time T, wherein the formula of the pre-coal-throwing time T is F (X)4Said F (X)4For load instructionsAnd the output constructed by subtracting the actual value of the load instruction after speed limiting from the target value is a broken line function of the time variable.
3) And coal is fed according to the pre-coal feeding amount Y and the pre-coal feeding time T.
The self-adaptive pre-coal-feeding method applied to the AGC-R mode of the thermal power generating unit, provided by the embodiment of the invention, at least has the following technical effects: by calculating the pre-coal-feeding time T and the pre-coal-feeding quantity Y, the unit can prejudge the coal quantity increase and decrease in advance in the load increasing and decreasing process, the response time of the boiler combustion rate is shortened, the load capacity of the unit in cooperative regulation is improved, the main steam pressure fluctuation of the unit caused by the large-amplitude load change of the unit in an AGC-R mode is avoided, the unit can adapt to the large-amplitude frequent load change, and various parameters of the unit can run safely and stably in the AGC-R mode.
According to some embodiments of the present invention, the difference between the turbine energy demand value and the actual boiler calorific value in the step 1) is calculated by F (X)3F (Δ e), where Δ e ═ Ps [ (P1/Pt) ×]-[P1+Ck(d(Pd)/dt)](ii) a Wherein P1 is the turbine regulating stage pressure, Ps is the pressure set value Pt is the pressure process value, Pd is the drum pressure, Ck is the heat storage coefficient of the boiler, (P1/Pt) × Ps is the expected input power of the turbine, and P1+ Ck (d (Pd)/dt) is the boiler heat signal HR.
According to an embodiment of the present invention, the polyline function F (X)1Is valued in a manner of
F(X)1＝-20，m＝-100；
F(X)1＝-15.1，m＝-60；
F(X)1＝-8，m＝-30；
F(X)1＝-4，m＝-10；
F(X)1＝0，m＝0；
F(X)1＝4，m＝10；
F(X)1＝5，m＝30；
F(X)1＝15.1，m＝60；
F(X)1＝20，m＝100；
Wherein m is the difference obtained by subtracting the actual value of the load instruction after speed limit from the target value of the load instructionValue, F (X)1The unit of (2) is t/h.
According to some embodiments of the invention, the polyline function is F (X)2Is valued in a manner of
F(X)2＝1.3，n＝-2；
F(X)2＝1.3，n＝-1；
F(X)2＝1.2，n＝-0.6；
F(X)2＝1.1，n＝-0.3；
F(X)2＝1，n＝-0.2；
F(X)2＝1，n＝0；
F(X)2＝1，n＝0.2；
F(X)2＝1.1，n＝0.3；
F(X)2＝1.2，n＝0.6；
F(X)2＝1.3，n＝1；
F(X)2＝1.3，n＝2；
Wherein n is the difference obtained by subtracting the actual value of the main steam pressure from the set value of the main steam pressure, and the unit of n is MPa.
According to some embodiments of the invention, the polyline function is F (X)3Is valued in a manner of
F(X)3＝1.2，△e＝-0.15；
F(X)3＝1.19，△e＝-0.12；
F(X)3＝1.14，△e＝-0.1；
F(X)3＝1.08，△e＝-0.08；
F(X)3＝1.05，△e＝-0.05；
F(X)3＝1，△e＝0；
F(X)3＝1.05，△e＝0.05；
F(X)3＝1.08，△e＝0.08；
F(X)3＝1.14，△e＝0.1；
F(X)3＝1.19，△e＝0.12；
F(X)3＝1.2，△e＝0.15；
Wherein, delta e is the difference between the steam turbine energy demand value and the actual boiler calorific value, and the unit of delta e is MPa.
According to some embodiments of the invention, the polyline function is F (X)4Is valued in a manner of
F(X)4＝260，m＝-200；
F(X)4＝260，m＝-100；
F(X)4＝225，m＝-70；
F(X)4＝50，m＝-10；
F(X)4＝30，m＝-5；
F(X)4＝0，m＝0；
F(X)4＝35，m＝5；
F(X)4＝56，m＝10；
F(X)4＝228，m＝70；
F(X)4＝260，m＝100；
F(X)3＝260，m＝200；
Wherein m is the load instruction target value minus the actual value of the load instruction after speed limiting, F (X)4The output value has the unit of s.
The adaptive pre-coal-feeding system applied to the AGC-R mode of the thermal power generating unit comprises a control system, wherein the control system applies any one of the methods to carry out adaptive pre-coal-feeding.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic flow chart of an adaptive pre-coal injection method according to an embodiment of the present invention;
fig. 2 is a working schematic diagram of an adaptive pre-coal-feeding system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the present number, and larger, smaller, inner, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
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