CN112394651B - Main control feed-forward method for temperature-reducing water boiler of thermal power generating unit - Google Patents
Main control feed-forward method for temperature-reducing water boiler of thermal power generating unit Download PDFInfo
- Publication number
- CN112394651B CN112394651B CN202011111908.1A CN202011111908A CN112394651B CN 112394651 B CN112394651 B CN 112394651B CN 202011111908 A CN202011111908 A CN 202011111908A CN 112394651 B CN112394651 B CN 112394651B
- Authority
- CN
- China
- Prior art keywords
- dynamic
- water
- component
- reheater
- superheater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a main control feedforward method for a thermal power generating unit temperature reduction water boiler, which aims at different influences of superheater temperature reduction water and reheater temperature reduction water actions on main steam pressure and unit load in a unit coordination control mode, by setting the static feed-forward component and the dynamic feed-forward component of the superheater desuperheater and the reheater desuperheater respectively, according to different response trends of superheater desuperheating water and reheater desuperheating water actions to main steam pressure, different parameters are set to correct dynamic feedforward components through main steam pressure deviation, the dynamic feedforward components are superposed and enter main control feedforward of a boiler of a coordinated control system of a unit, the fuel quantity is quickly adjusted, the disturbance to the main steam pressure and the disturbance to the unit load caused by actions of superheater desuperheating water and reheater desuperheating water in the unit operation process are eliminated, and the load dynamic response performance and the stability of the load steady-state working condition of the thermal power unit are improved.
Description
Technical Field
The invention relates to the field of boiler master control feedforward of a thermal power unit coordinated control system, in particular to a feedforward method for eliminating desuperheating water action disturbance by a thermal power unit boiler master control.
Background
The main steam temperature in the thermal power generating unit is a very important operating parameter, the control of the main steam temperature is a particularly key part of the thermal power generating unit, and the thermal power generating unit generally sets a higher variable load rate for quickly responding to a load instruction of the AGC along with higher requirements of power grid dispatching on an AGC (automatic gain control) adjusting function of the thermal power generating unit. Due to inherent large delay and large inertia characteristics of boiler powder making, combustion and heat transfer processes, the combustion working condition of a boiler is rapidly changed by generally adopting modes of sharply increasing and decreasing fuel quantity, primary air quantity and the like in a boiler main control process in a rapid load changing process, so that the response speed of the boiler is improved, but the temperature of main steam is greatly fluctuated in the process, the temperature of superheater desuperheating water is rapidly changed, even reheater desuperheating water (including accident desuperheating water) frequently acts, the main steam pressure of a unit and the load of the unit are obviously fluctuated, and even the main steam pressure exceeds an alarm value due to rapid spraying of the accident desuperheating water in a high load section.
Through analyzing operation data under a unit coordination control mode, the fact that rapid change of superheater desuperheating water directly affects main steam pressure is found, rapid change of reheater desuperheating water firstly causes change of intermediate pressure cylinder inlet pressure and directly affects unit actual power, and steam turbine main control rapidly adjusts opening of a high-pressure main steam adjusting valve for eliminating load deviation, so that original energy balance of a boiler is destroyed, and fluctuation of the main steam pressure is caused. In a traditional unit coordination control system, a boiler main control is generally provided with load dynamic feedforward to improve the response requirement of a boiler on a unit load, but corresponding boiler feedforward components are not set aiming at different influences of superheater desuperheating water and reheater desuperheating water on main steam pressure and load.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a main control feedforward method for a thermal power generating unit desuperheating water boiler, which eliminates the disturbance to main steam pressure and the disturbance to unit load caused by the actions of superheater desuperheating water and reheater desuperheating water in the unit operation process, and improves the dynamic response performance of the thermal power generating unit load and the stability of the thermal power generating unit under the load steady-state working condition.
The technical scheme adopted by the invention for solving the problems is as follows: a main control feedforward method for a desuperheating water boiler of a thermal power generating unit is characterized by comprising a reheater desuperheating water boiler feedforward component N and a superheater desuperheating water boiler feedforward component M, wherein the desuperheating water boiler main control feedforward FFW = M + N;
the feedforward component N of the reheater desuperheating water boiler is obtained through the following steps:
s01 reheater desuperheater static feedforward component N1: the total flow of reheater desuperheating water passes through a reheater desuperheating water static function F1(x) to obtain a reheater desuperheating water static feedforward component N1, wherein F1(x) = [0, 0; 0.4, 0; 2, -1; 5, -2; 8, -3; 10, -4; 20, -5 ];
s02 reheater desuperheater dynamic feedforward component N2: the reheater desuperheating water dynamic feedforward component N2= the reheater desuperheating water dynamic quantity N3 × the reheater desuperheating water dynamic coefficient K1;
s02.1 reheater desuperheated water dynamic quantity N3: obtaining a dynamic increasing component N4 and a dynamic decreasing component N5 by a differential value DF1 of the total flow of reheater desuperheating water through a dynamic feedforward function F2(x) of reheater desuperheating water, condition selection and speed limitation, wherein the dynamic amount of reheater desuperheating water N3= dynamic increasing component N4+ dynamic decreasing component N5, wherein F2(x) = [ -15, 6; -10, 4; -5, 3; -1, 1.5; -0.2, 0; 0.2, 0; 1, -1.5; 5, -3; 10, -4; 15, -6], when-0.2 < DF1 < 0.2, the dynamic increasing component N4 and the dynamic decreasing component N5 are simultaneously 0, the dynamic component N3=0, when DF1 is greater than or equal to 0.2, the dynamic increasing component N4 is an F2(x) output value, the dynamic decreasing component N5 is 0, and N4 decreases with increasing DF1 and increases with decreasing DF1 during DF1 variation, when DF1 is less than or equal to-0.2, the dynamic increasing component N4 is 0, the dynamic decreasing component N5 is an F2(x) output value, and during 1 variation, N5 increases with decreasing DF1 and decreases with increasing DF 1;
s02.2 reheater desuperheated water dynamic coefficient K1: main steam pressure deviation E = main steam pressure set value PS — main steam pressure real-time value PT, as input values of reheater water-reducing temperature-reducing coefficient function F3(x) and reheater water-reducing temperature-increasing coefficient function F4(x), and values of output values of F3(x) and F4(x) after condition selection are reheater water-reducing temperature dynamic coefficient K1, when differential value DF1 of total reheater water-reducing temperature flow is equal to or less than-0.2, K1 is an output value of F3(x), when differential value DF1 of total reheater water-reducing temperature flow is greater than-0.2, K1 is an output value of F4(x), where F3(x) = [ -0.8, 0; -0.6, 0; -0.4; 0.2; -0.2, 0.5; 0.2, 0.6; 0.4, 0.8; 0.6, 1; 0.8, 1.2], F4(x) = [ -0.8, 1.2; -0.6, 1; -0.4; 0.8; -0.2, 0.6; 0.2, 0.5; 0.4, 0.2; 0.6, 0; 0.8, 0 ];
the feedforward component M of the superheater desuperheating water boiler is obtained by the following steps:
s11 superheater desuperheater static feed-forward component M1: the total flow of the superheater attemperation water is processed by a superheater attemperation water static function F8(x) to obtain a superheater attemperation water static feedforward component M1, wherein F8(x) = [0, 0; 1, 0; 2, -1; 5, -2; 8, -3; 10, -4; 20, -5; 30, -6 ];
s12 superheater desuperheater water dynamic feed-forward component M2: the dynamic feedforward component M2 of the superheater desuperheating water = dynamic quantity M3 times dynamic coefficient K2 of the superheater desuperheating water;
s12.1, dynamic amount M3 of desuperheater water: obtaining a dynamic increasing component M4 and a dynamic decreasing component M5 by a differential value DF2 of the total flow of the superheater attemperation water through a superheater attemperation water dynamic feedforward function F7(x) and condition selection and speed limitation, wherein the superheater attemperation water dynamic amount M3= the dynamic increasing component M4+ the dynamic decreasing component M5, wherein F7(x) = [ -20, 5; -10, 3; -5, 3; -1, 1; -0.4, 0; 0.4, 0; 1, -1; 5, -2; 10, -3; 20, -5], when-0.4 < DF2 < 0.4, the dynamic increasing component M4 and the dynamic decreasing component M5 are simultaneously 0, the dynamic component M3=0, when DF2 is greater than or equal to 0.4, the dynamic increasing component M4 is an F7(x) output value, the dynamic decreasing component M5 is 0, and M4 decreases with increasing DF2 and increases with decreasing DF2 during DF2 variation, when DF2 is less than or equal to-0.4, the dynamic increasing component M4 is 0, the dynamic decreasing component M5 is an F7(x) output value, and during 2 variation, M5 increases with decreasing DF2 and decreases with increasing DF 2;
s12.2, dynamic coefficient of desuperheater water K2: main steam pressure deviation E = main steam pressure set value PS-main steam pressure real-time value PT, as input values of superheater temperature-reducing water reducing coefficient function F5(x) and superheater temperature-reducing water increasing coefficient function F6(x), values of output values of F5(x) and F6(x) after condition selection are superheater temperature-reducing water dynamic coefficient K2, when differential value DF2 of total superheater temperature-reducing water flow is greater than or equal to 0.4, K2 is the output value of F6(x), when differential value DF1 of total reheater temperature-reducing water flow is less than-0.4, K2 is the output value of F5(x), wherein F5(x) = [ -0.8, 0; -0.6, 0.1; -0.4; 0.15; -0.2, 0.4; 0.2, 0.6; 0.4, 0.7; 0.6, 0.9; 0.8, 1], F6(x) = [ -0.8, 1; -0.6, 0.9; -0.4; 0.7; -0.2, 0.6; 0.2, 0.4; 0.4, 0.15; 0.6, 0; 0.8,0].
And directly adding the main control feedforward FFW of the reduced-temperature water boiler and feedforward components of other boilers to form the main control feedforward of the boiler of the unit coordination control system, and sending the main control feedforward of the boiler to the main control of the boiler to control the fuel quantity.
Compared with the prior art, the invention has the following advantages and effects: according to different influences of the superheater desuperheating water and the reheater desuperheating water on main steam pressure and load of the unit, the main control feedforward of the desuperheating water boiler is divided into a superheater desuperheating water feedforward component and a reheater desuperheating water boiler main control feedforward component, disturbance of the main steam pressure and unit load caused by actions of the superheater desuperheating water and the reheater desuperheating water in the running process of the unit is eliminated, and dynamic response performance of the load of the thermal power unit and stability of the steady-state working condition of the load are improved.
Drawings
Fig. 1 is a control principle framework diagram in the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
A main control feedforward method for a desuperheating water boiler of a thermal power generating unit is characterized in that a main control feedforward FFW of the desuperheating water boiler is added in a main control feedforward of the boiler of a coordinated control system of the thermal power generating unit, and the calculation method comprises the following steps:
increasing a main control feedforward FFW of the desuperheating water boiler, wherein the main control feedforward FFW of the desuperheating water boiler comprises a reheater desuperheating water boiler feedforward component N and a superheater desuperheating water boiler feedforward component M, and the main control feedforward FFW = M + N;
the feedforward component N of the reheater desuperheating water boiler is obtained by the following steps:
s01 reheater desuperheater static feedforward component N1: the flow of reheater desuperheating water (including side a accident desuperheating water, side B accident desuperheating water, side a trace desuperheating water and side B trace desuperheating water) passes through a reheater desuperheating water static function F1(x) to obtain a reheater desuperheating water static feedforward component N1, wherein F1(x) = [0, 0; 0.4, 0; 2, -1; 5, -2; 8, -3; 10, -4; 20, -5 ];
s02 reheater desuperheater dynamic feedforward component N2: the reheater desuperheating water dynamic feedforward component N2= the reheater desuperheating water dynamic quantity N3 × the reheater desuperheating water dynamic coefficient K1;
s02.1 reheater desuperheated water dynamic quantity N3: obtaining a dynamic increasing component N4 and a dynamic decreasing component N5 by a differential value DF1 of the total flow of reheater desuperheating water through a dynamic feedforward function F2(x) of reheater desuperheating water, condition selection and speed limitation, wherein the dynamic amount of reheater desuperheating water N3= dynamic increasing component N4+ dynamic decreasing component N5, wherein F2(x) = [ -15, 6; -10, 4; -5, 3; -1, 1.5; -0.2, 0; 0.2, 0; 1, -1.5; 5, -3; 10, -4; 15, -6] when-0.2 < DF1 < 0.2, the dynamic increasing component N4 and the dynamic decreasing component N5 are simultaneously 0, the dynamic component N3=0, when DF1 is ≧ 0.2, the dynamic increasing component N4 is the F2(x) output value, the dynamic decreasing component N5 is 0, and during DF1 variation, N4 decreases with increasing DF1, increasing with decreasing DF1 at a rate of 0.6/s, when DF1 is ≦ 0.2, the dynamic increasing component N4 is 0, the dynamic decreasing component N5 is the F2(x) output value, and during DF1 variation, N5 increases with decreasing DF1, decreasing with increasing DF1 at a rate of-0.6/s;
s02.2 reheater desuperheated water dynamic coefficient K1: main steam pressure deviation E = main steam pressure set value PS — main steam pressure real-time value PT, as input values of reheater water-reducing temperature-reducing coefficient function F3(x) and reheater water-reducing temperature-increasing coefficient function F4(x), and values of output values of F3(x) and F4(x) after condition selection are reheater water-reducing temperature dynamic coefficient K1, when differential value DF1 of total reheater water-reducing temperature flow is equal to or less than-0.2, K1 is an output value of F3(x), when differential value DF1 of total reheater water-reducing temperature flow is greater than-0.2, K1 is an output value of F4(x), where F3(x) = [ -0.8, 0; -0.6, 0; -0.4; 0.2; -0.2, 0.5; 0.2, 0.6; 0.4, 0.8; 0.6, 1; 0.8, 1.2], F4(x) = [ -0.8, 1.2; -0.6, 1; -0.4; 0.8; -0.2, 0.6; 0.2, 0.5; 0.4, 0.2; 0.6, 0; 0.8, 0 ];
the feedforward component M of the superheater desuperheating water boiler is obtained by the following steps:
s11 superheater desuperheater static feed-forward component M1: the total flow of superheater desuperheating water (including first-stage A side superheater desuperheating water, first-stage B side superheater desuperheating water, second-stage A side superheater desuperheating water and second-stage B side superheater desuperheating water) is processed by a superheater desuperheating water static function F8(x) to obtain a superheater desuperheating water static feedforward component M1, wherein F8(x) = [0, 0; 1, 0; 2, -1; 5, -2; 8, -3; 10, -4; 20, -5; 30, -6 ];
s12 superheater desuperheater water dynamic feed-forward component M2: the dynamic feedforward component M2 of the superheater desuperheating water = dynamic quantity M3 times dynamic coefficient K2 of the superheater desuperheating water;
s12.1, dynamic amount M3 of desuperheater water: obtaining a dynamic increasing component M4 and a dynamic decreasing component M5 by a differential value DF2 of the total flow of the superheater attemperation water through a superheater attemperation water dynamic feedforward function F7(x) and condition selection and speed limitation, wherein the superheater attemperation water dynamic amount M3= the dynamic increasing component M4+ the dynamic decreasing component M5, wherein F7(x) = [ -20, 5; -10, 3; -5, 3; -1, 1; -0.4, 0; 0.4, 0; 1, -1; 5, -2; 10, -3; 20, -5] when-0.4 < DF2 < 0.4, the dynamic increasing component M4 and the dynamic decreasing component M5 are simultaneously 0, the dynamic component M3=0, when DF2 is ≧ 0.4, the dynamic increasing component M4 is the F7(x) output value, the dynamic decreasing component M5 is 0, and during DF2 variation, M4 decreases with increasing DF2, increases with decreasing DF2 at a rate of 0.8/s, when DF2 is ≦ 0.4, the dynamic increasing component M4 is 0, the dynamic decreasing component M5 is the F7(x) output value, and during DF2 variation, M5 increases with decreasing DF2, decreases with increasing DF2 at a rate of-0.8/s;
s12.2, dynamic coefficient of desuperheater water K2: main steam pressure deviation E = main steam pressure set value PS-main steam pressure real-time value PT, as input values of superheater temperature-reducing water reducing coefficient function F5(x) and superheater temperature-reducing water increasing coefficient function F6(x), values of output values of F5(x) and F6(x) after condition selection are superheater temperature-reducing water dynamic coefficient K2, when differential value DF2 of total superheater temperature-reducing water flow is greater than or equal to 0.4, K2 is the output value of F6(x), when differential value DF1 of total reheater temperature-reducing water flow is less than-0.4, K2 is the output value of F5(x), wherein F5(x) = [ -0.8, 0; -0.6, 0.1; -0.4; 0.15; -0.2, 0.4; 0.2, 0.6; 0.4, 0.7; 0.6, 0.9; 0.8, 1], F6(x) = [ -0.8, 1; -0.6, 0.9; -0.4; 0.7; -0.2, 0.6; 0.2, 0.4; 0.4, 0.15; 0.6, 0; 0.8,0].
And directly adding the main control feedforward FFW of the reduced-temperature water boiler and feedforward components of other boilers to form the main control feedforward of the boiler of the unit coordination control system, and sending the main control feedforward of the boiler to the main control of the boiler to control the fuel quantity.
Specifically, referring to fig. 1, the method includes collecting set values of primary a-side superheater attemperation water flow, primary B-side superheater attemperation water flow, secondary a-side superheater attemperation water flow, secondary B-side superheater attemperation water flow, a-side accident attemperation water flow, B-side accident attemperation water flow, a-side micro attemperation water flow, B-side micro attemperation water flow, main steam pressure, and main steam pressure as input variables. The main control feed-forward method of the temperature-reducing water boiler of the fire-electric generating set in the embodiment is mainly divided into two parts: a feedforward component M of the superheater desuperheating water boiler and a feedforward component N of the reheater desuperheating water boiler.
A first part: adding the side A accident desuperheating water flow, the side B accident desuperheating water flow, the side A trace desuperheating water flow and the side B trace desuperheating water flow to obtain a total reheater desuperheating water flow, and obtaining a reheater desuperheating water static feedforward component N1 through F1(x), wherein F1(x) = [0, 0; 0.4, 0; 2, -1; 5, -2; 8, -3; 10, -4; 20-5, obtaining unit operation historical data and test data by obtaining and properly weakening the unit operation historical data and the test data, specifically, calculating the influence of main steam pressure of the unit caused by unit flow change under different reheater attemperation water flows, eliminating the coal amount required to change by main steam pressure deviation, and finally obtaining a coal amount instruction function corresponding to attemperation water flow;
obtaining an output quantity of the reheater desuperheating water during dynamic change through F2(x) by a differential value DF1 of the total flow of the reheater desuperheating water, obtaining a dynamic increasing quantity N4 and a dynamic decreasing quantity N5 after condition selection and speed limitation, wherein the dynamic reheater desuperheating water amount N3= a dynamic increasing quantity N4+ a dynamic decreasing quantity N5, wherein F2(x) = [ -15, 6; -10, 4; -5, 3; -1, 1.5; -0.2, 0; 0.2, 0; 1, -1.5; 5, -3; 10, -4; 15, -6] when-0.2 < DF1 < 0.2, the dynamic increasing component N4 and the dynamic decreasing component N5 are simultaneously 0, the dynamic component N3=0, when DF1 is ≧ 0.2, the dynamic increasing component N4 is the F2(x) output value, the dynamic decreasing component N5 is 0, and during DF1 variation, N4 decreases with increasing DF1, increasing with decreasing DF1 at a rate of 0.6/s, when DF1 is ≦ 0.2, the dynamic increasing component N4 is 0, the dynamic decreasing component N5 is the F2(x) output value, and during DF1 variation, N5 increases with decreasing DF1, decreasing with increasing DF1 at a rate of-0.6/s;
main steam pressure deviation E = main steam pressure set value PS — main steam pressure real-time value PT, as input values of reheater water-reducing temperature-reducing coefficient function F3(x) and reheater water-reducing temperature-increasing coefficient function F4(x), and values of output values of F3(x) and F4(x) after condition selection are reheater water-reducing temperature dynamic coefficient K1, when differential value DF1 of total reheater water-reducing temperature flow is equal to or less than-0.2, K1 is an output value of F3(x), when differential value DF1 of total reheater water-reducing temperature flow is greater than-0.2, K1 is an output value of F4(x), where F3(x) = [ -0.8, 0; -0.6, 0; -0.4; 0.2; -0.2, 0.5; 0.2, 0.6; 0.4, 0.8; 0.6, 1; 0.8, 1.2], F4(x) = [ -0.8, 1.2; -0.6, 1; -0.4; 0.8; -0.2, 0.6; 0.2, 0.5; 0.4, 0.2; 0.6, 0; 0.8, 0 ];
the reheater reduced temperature water dynamic feedforward component N2= reheater reduced temperature water dynamic quantity N3 multiplied by a reheater reduced temperature water dynamic coefficient K1, that is, when the reheater reduced temperature water is increased, the reheater reduced temperature water dynamic feedforward component is reduced, under the unit under-pressure working condition, the dynamic feedforward component reduction is weakened, under the unit over-pressure working condition, the dynamic feedforward component reduction is strengthened, when the reheater reduced temperature water is reduced, the reheater reduced temperature water dynamic feedforward component is increased, under the unit under-pressure working condition, the dynamic feedforward component increase is weakened, and under the unit over-pressure working condition, the dynamic feedforward component increase is strengthened.
A second part: adding the desuperheating water flow of the primary A-side superheater, the desuperheating water flow of the primary B-side superheater, the desuperheating water flow of the secondary A-side superheater and the desuperheating water flow of the secondary B-side superheater to obtain the total desuperheating water flow of the superheaters, and obtaining a static feedforward component M1 of the desuperheating water through F8(x), wherein F8(x) = [0, 0 ]; 1, 0; 2, -1; 5, -2; 8, -3; 10, -4; 20, -5; 30-6, obtaining the operation historical data and the test data of the unit by obtaining and properly weakening, specifically calculating the main steam pressure influence of the unit caused by unit flow change under different superheater attemperation water flows, eliminating the coal amount required to change by main steam pressure deviation, and finally obtaining a coal amount instruction function corresponding to the attemperation water flow;
obtaining a dynamic increasing component M4 and a dynamic decreasing component M5 by a differential value DF2 of the total flow of the superheater attemperation water through a superheater attemperation water dynamic feedforward function F7(x) and condition selection and speed limitation, wherein the superheater attemperation water dynamic amount M3= the dynamic increasing component M4+ the dynamic decreasing component M5, wherein F7(x) = [ -20, 5; -10, 3; -5, 3; -1, 1; -0.4, 0; 0.4, 0; 1, -1; 5, -2; 10, -3; 20, -5] when-0.4 < DF2 < 0.4, the dynamic increasing component M4 and the dynamic decreasing component M5 are simultaneously 0, the dynamic component M3=0, when DF2 is ≧ 0.4, the dynamic increasing component M4 is the F7(x) output value, the dynamic decreasing component M5 is 0, and during DF2 variation, M4 decreases with increasing DF2, increases with decreasing DF2 at a rate of 0.8/s, when DF2 is ≦ 0.4, the dynamic increasing component M4 is 0, the dynamic decreasing component M5 is the F7(x) output value, and during DF2 variation, M5 increases with decreasing DF2, decreases with increasing DF2 at a rate of-0.8/s;
main steam pressure deviation E = main steam pressure set value PS-main steam pressure real-time value PT, as input values of superheater temperature-reducing water reducing coefficient function F5(x) and superheater temperature-reducing water increasing coefficient function F6(x), values of output values of F5(x) and F6(x) after condition selection are reheater temperature-reducing water dynamic coefficient K2, when differential value DF2 of total superheater temperature-reducing water flow is greater than or equal to 0.4, K2 is the output value of F6(x), when differential value DF1 of total reheater temperature-reducing water flow is less than-0.4, K2 is the output value of F5(x), wherein F5(x) = [ -0.8, 0; -0.6, 0.1; -0.4; 0.15; -0.2, 0.4; 0.2, 0.6; 0.4, 0.7; 0.6, 0.9; 0.8, 1], F6(x) = [ -0.8, 1; -0.6, 0.9; -0.4; 0.7; -0.2, 0.6; 0.2, 0.4; 0.4, 0.15; 0.6, 0; 0.8, 0 ];
the dynamic feedforward component M2= the dynamic quantity M3 times the dynamic coefficient K2 of the desuperheater, namely when the desuperheater is increased, the dynamic feedforward component of the desuperheater is reduced, the dynamic feedforward component is reduced under the condition of unit under-pressure, the dynamic feedforward component is enhanced under the condition of unit overpressure, when the desuperheater of the reheater is reduced, the dynamic feedforward component of the desuperheater of the reheater is increased, the dynamic feedforward component is reduced under the condition of unit under-pressure, and the dynamic feedforward component is enhanced under the condition of unit overpressure.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (2)
1. A main control feedforward method for a desuperheating water boiler of a thermal power generating unit is characterized by comprising a reheater desuperheating water boiler feedforward component N and a superheater desuperheating water boiler feedforward component M, wherein the desuperheating water boiler main control feedforward FFW = M + N;
the feedforward component N of the reheater desuperheating water boiler is obtained through the following steps:
s01 reheater desuperheater static feedforward component N1: the total flow of reheater desuperheating water passes through a reheater desuperheating water static function F1(x) to obtain a reheater desuperheating water static feedforward component N1, wherein F1(x) = [0, 0; 0.4, 0; 2, -1; 5, -2; 8, -3; 10, -4; 20, -5 ];
s02 reheater desuperheater dynamic feedforward component N2: the reheater desuperheating water dynamic feedforward component N2= the reheater desuperheating water dynamic quantity N3 × the reheater desuperheating water dynamic coefficient K1;
s02.1 reheater desuperheated water dynamic quantity N3: obtaining a dynamic increasing component N4 and a dynamic decreasing component N5 by a differential value DF1 of the total flow of reheater desuperheating water through a dynamic feedforward function F2(x) of reheater desuperheating water, condition selection and speed limitation, wherein the dynamic amount of reheater desuperheating water N3= dynamic increasing component N4+ dynamic decreasing component N5, wherein F2(x) = [ -15, 6; -10, 4; -5, 3; -1, 1.5; -0.2, 0; 0.2, 0; 1, -1.5; 5, -3; 10, -4; 15, -6], when-0.2 < DF1 < 0.2, the dynamic increasing component N4 and the dynamic decreasing component N5 are simultaneously 0, the dynamic component N3=0, when DF1 is greater than or equal to 0.2, the dynamic increasing component N4 is an F2(x) output value, the dynamic decreasing component N5 is 0, and N4 decreases with increasing DF1 and increases with decreasing DF1 during DF1 variation, when DF1 is less than or equal to-0.2, the dynamic increasing component N4 is 0, the dynamic decreasing component N5 is an F2(x) output value, and during 1 variation, N5 increases with decreasing DF1 and decreases with increasing DF 1;
s02.2 reheater desuperheated water dynamic coefficient K1: main steam pressure deviation E = main steam pressure set value PS — main steam pressure real-time value PT, as input values of reheater water-reducing temperature-reducing coefficient function F3(x) and reheater water-reducing temperature-increasing coefficient function F4(x), and values of output values of F3(x) and F4(x) after condition selection are reheater water-reducing temperature dynamic coefficient K1, when differential value DF1 of total reheater water-reducing temperature flow is equal to or less than-0.2, K1 is an output value of F3(x), when differential value DF1 of total reheater water-reducing temperature flow is greater than-0.2, K1 is an output value of F4(x), where F3(x) = [ -0.8, 0; -0.6, 0; -0.4; 0.2; -0.2, 0.5; 0.2, 0.6; 0.4, 0.8; 0.6, 1; 0.8, 1.2], F4(x) = [ -0.8, 1.2; -0.6, 1; -0.4; 0.8; -0.2, 0.6; 0.2, 0.5; 0.4, 0.2; 0.6, 0; 0.8, 0 ];
the feedforward component M of the superheater desuperheating water boiler is obtained by the following steps:
s11 superheater desuperheater static feed-forward component M1: the total flow of the superheater attemperation water is processed by a superheater attemperation water static function F8(x) to obtain a superheater attemperation water static feedforward component M1, wherein F8(x) = [0, 0; 1, 0; 2, -1; 5, -2; 8, -3; 10, -4; 20, -5; 30, -6 ];
s12 superheater desuperheater water dynamic feed-forward component M2: the dynamic feedforward component M2 of the superheater desuperheating water = dynamic quantity M3 times dynamic coefficient K2 of the superheater desuperheating water;
s12.1, dynamic amount M3 of desuperheater water: obtaining a dynamic increasing component M4 and a dynamic decreasing component M5 by a differential value DF2 of the total flow of the superheater attemperation water through a superheater attemperation water dynamic feedforward function F7(x) and condition selection and speed limitation, wherein the superheater attemperation water dynamic amount M3= the dynamic increasing component M4+ the dynamic decreasing component M5, wherein F7(x) = [ -20, 5; -10, 3; -5, 3; -1, 1; -0.4, 0; 0.4, 0; 1, -1; 5, -2; 10, -3; 20, -5], when-0.4 < DF2 < 0.4, the dynamic increasing component M4 and the dynamic decreasing component M5 are simultaneously 0, the dynamic component M3=0, when DF2 is greater than or equal to 0.4, the dynamic increasing component M4 is an F7(x) output value, the dynamic decreasing component M5 is 0, and M4 decreases with increasing DF2 and increases with decreasing DF2 during DF2 variation, when DF2 is less than or equal to-0.4, the dynamic increasing component M4 is 0, the dynamic decreasing component M5 is an F7(x) output value, and during 2 variation, M5 increases with decreasing DF2 and decreases with increasing DF 2;
s12.2, dynamic coefficient of desuperheater water K2: main steam pressure deviation E = main steam pressure set value PS-main steam pressure real-time value PT, as input values of superheater temperature-reducing water reducing coefficient function F5(x) and superheater temperature-reducing water increasing coefficient function F6(x), values of output values of F5(x) and F6(x) after condition selection are superheater temperature-reducing water dynamic coefficient K2, when differential value DF2 of total superheater temperature-reducing water flow is greater than or equal to 0.4, K2 is the output value of F6(x), when differential value DF1 of total reheater temperature-reducing water flow is less than-0.4, K2 is the output value of F5(x), wherein F5(x) = [ -0.8, 0; -0.6, 0.1; -0.4; 0.15; -0.2, 0.4; 0.2, 0.6; 0.4, 0.7; 0.6, 0.9; 0.8, 1], F6(x) = [ -0.8, 1; -0.6, 0.9; -0.4; 0.7; -0.2, 0.6; 0.2, 0.4; 0.4, 0.15; 0.6, 0; 0.8,0].
2. The main control feed-forward method of the reduced-temperature water boiler of the thermal power generating unit as claimed in claim 1, wherein the main control feed-forward FFW of the reduced-temperature water boiler is directly added with feed-forward components of other boilers to be used as a main control feed-forward of the boiler main control of the unit coordination control system, and the main control feed-forward is sent to the boiler main control to control the fuel quantity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011111908.1A CN112394651B (en) | 2020-10-16 | 2020-10-16 | Main control feed-forward method for temperature-reducing water boiler of thermal power generating unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011111908.1A CN112394651B (en) | 2020-10-16 | 2020-10-16 | Main control feed-forward method for temperature-reducing water boiler of thermal power generating unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112394651A CN112394651A (en) | 2021-02-23 |
| CN112394651B true CN112394651B (en) | 2021-10-08 |
Family
ID=74595582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011111908.1A Active CN112394651B (en) | 2020-10-16 | 2020-10-16 | Main control feed-forward method for temperature-reducing water boiler of thermal power generating unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112394651B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113325690B (en) * | 2021-04-29 | 2022-11-11 | 华电电力科学研究院有限公司 | Safety control method for main steam pressure abnormal working condition of thermal power generating unit coordinated control system |
| CN113391615B (en) * | 2021-05-10 | 2024-04-02 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Variable time pulse algorithm for probability statistics |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104238520B (en) * | 2014-09-18 | 2016-09-28 | 安徽新力电业科技咨询有限责任公司 | Super critical boiler fire coal calorific value self-balancing controls loop scattered control system implementation method |
| US10387775B2 (en) * | 2015-09-09 | 2019-08-20 | Emerson Process Management Power & Water Solutions, Inc. | Model-based characterization of pressure/load relationship for power plant load control |
| CN106094740B (en) * | 2016-05-09 | 2019-05-21 | 国网江西省电力科学研究院 | A kind of fired power generating unit duty control method based on superheater accumulation of heat feedforward |
| CN109189022B (en) * | 2018-09-13 | 2020-12-08 | 华电电力科学研究院有限公司 | Thermal power factory thermal automation system integral framework |
| CN110360540B (en) * | 2019-07-22 | 2020-08-07 | 国网吉林省电力有限公司电力科学研究院 | Boiler main steam temperature control method for power grid AGC load instruction frequent fluctuation |
| CN111399448B (en) * | 2020-02-26 | 2021-09-14 | 华电电力科学研究院有限公司 | Coal-fired unit primary frequency modulation control method in steam turbine following mode |
| CN111708333A (en) * | 2020-06-01 | 2020-09-25 | 王铁军 | Intelligent prediction coordination control system of power plant |
-
2020
- 2020-10-16 CN CN202011111908.1A patent/CN112394651B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112394651A (en) | 2021-02-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103557511B (en) | All-process control method for main steam temperature of utility boiler | |
| Tan et al. | Multivariable robust controller design for a boiler system | |
| CN112394651B (en) | Main control feed-forward method for temperature-reducing water boiler of thermal power generating unit | |
| WO2019165839A1 (en) | Boiler superheated steam temperature control method, device and system | |
| De Mello | Boiler models for system dynamic performance studies | |
| EP2395284B1 (en) | Single Loop Attemperation Control | |
| CN114089795B (en) | Fuzzy neural network temperature control system and method based on event triggering | |
| CA2747921C (en) | Dynamic matrix control of steam temperature with prevention of saturated steam entry into superheater | |
| CN104865925B (en) | A kind of generated output instruction feed forward control method of fired power generating unit coordinated control system | |
| EP2606206B1 (en) | Method for controlling a short-term increase in power of a steam turbine | |
| US6766646B1 (en) | Rapid power producing system and method for steam turbine | |
| CN111765447B (en) | Power generation boiler main steam temperature control method and system based on multivariable decoupling | |
| CN104200121A (en) | Valve flow function optimization method based on unit operation data | |
| CN112039091B (en) | Primary frequency modulation control method based on zero number high-order addition | |
| Darwish et al. | Advanced boiler control system for steam power plants using modern control techniques | |
| EP2616643B1 (en) | Method for regulating a short-term power increase of a steam tubine | |
| CN105387449B (en) | A kind of control method that second-order differential is used in boiler steam temperature control | |
| Alamoodi et al. | Nonlinear decoupling control with deadtime compensation for multirange operation of steam power plants | |
| CN115808876A (en) | Self-adaptive control method and device for engine tail jet pipe actuating mechanism | |
| Li et al. | Reheated steam temperature control in thermal power plant using integral-linear active disturbance rejection control | |
| DE102014004287A1 (en) | Method for power regulation of gas and steam cogeneration plants with counter-pressure steam turbine (s) for full participation in the primary and secondary control while controlling the heat load | |
| CN111365703A (en) | Reheat steam temperature composite control method based on humanoid intelligent control | |
| JP4637943B2 (en) | Control method of pressurized fluidized bed boiler | |
| CN113283098B (en) | Calculation method for steam temperature feedforward control signal of superheater/reheater of thermal power generating unit | |
| Fang et al. | Output tracking control of a nonlinear boiler-turbine unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |