CN112983578A - Control system and method for exhaust steam temperature of deep peak regulation low-pressure cylinder - Google Patents

Control system and method for exhaust steam temperature of deep peak regulation low-pressure cylinder Download PDF

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Publication number
CN112983578A
CN112983578A CN202110235647.2A CN202110235647A CN112983578A CN 112983578 A CN112983578 A CN 112983578A CN 202110235647 A CN202110235647 A CN 202110235647A CN 112983578 A CN112983578 A CN 112983578A
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module
value
output
input
block
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CN112983578B (en
Inventor
解世涛
谭祥帅
胥成增
刘明海
张宏元
陈景勇
段新潮
刘文仓
李春
李雪冰
刘琼伟
李佳
孙海颖
王瑾
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Jingneng Shiyan Thermoelectricity Co ltd
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Jingneng Shiyan Thermoelectricity Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
    • F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F01D21/003—Arrangements for testing or measuring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/02—Controlling, e.g. stopping or starting

Abstract

The invention discloses a control system and a control method for deep peak regulation low-pressure cylinder exhaust temperature, which relate to the technical field of thermal power generation and comprise a first acquisition module low-pressure cylinder exhaust temperature AI block, a second acquisition module low-pressure cylinder exhaust temperature AI block, a unit given load AI block, a low-pressure cylinder water spray regulating valve position feedback AI block, an AGC input instruction DI block, a generator power AI block, a first large selection module, a comparison module, a first setting module, a limiting module, a first function module, a second function module, an AND gate module, a PID calculation module, a second large selection module, a subtracter, a NOT gate module, a hysteresis module, a second setting module, an adder, a switching module and a low-pressure cylinder water spray regulating valve instruction AO block.

Description

Control system and method for exhaust steam temperature of deep peak regulation low-pressure cylinder
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a control system and a control method for exhaust steam temperature of a deep peak-shaving low-pressure cylinder.
Background
Under the guidance of carbon neutralization targets, the development of new energy industries such as wind power and photovoltaic is in a high heat. With the incorporation of a large amount of new energy into the power grid, the role of thermal power generating units is being changed from power supply bodies to basic power supplies that provide peak shaving and frequency modulation guarantees for the power grid.
In the process of deep peak regulation, steam flow of a steam turbine is inevitably reduced in a low-load stage, so that steam flow flux on blades of the steam turbine is reduced, the blades at the last stage are not cooled due to blast friction heating, so that exhaust steam temperature is increased, and a unit is stopped in severe cases.
The exhaust temperature of the low-pressure cylinder has the characteristic of large inertia hysteresis, and the effective control of the exhaust temperature of the low-pressure cylinder cannot be met by adopting the traditional closed-loop control, so that an open-loop control method is adopted during deep peak shaving, and the exhaust temperature of the low-pressure cylinder can be effectively and accurately controlled during load change at a low-load stage.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a control system and a control method for the exhaust steam temperature of a deep peak-shaving low-pressure cylinder, which can effectively solve the problems that the steam flow on a steam turbine blade is reduced due to the reduction of the steam flow of the steam turbine when the exhaust steam temperature of the low-pressure cylinder is subjected to deep peak shaving, and the exhaust steam temperature is increased due to the fact that a last-stage blade is not cooled due to blast friction heating, and ensure the operation safety of a unit during the deep peak shaving. .
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: the utility model provides a control system for degree of depth peak regulation low pressure cylinder exhaust temperature, including first collection module low pressure cylinder exhaust temperature AI piece, second collection module low pressure cylinder exhaust temperature AI piece, the unit is given load AI piece, low pressure cylinder water spray regulating valve position feedback AI piece, AGC puts into instruction DI piece, generator power AI piece, first big selection module, comparison module, first setting module, restriction module, first function module, second function module, AND gate module, PID calculation module, the big selection module of second, the subtractor, NOT gate module, hysteresis module, second setting module, the adder, switch module, low pressure cylinder water spray regulating valve instruction AO piece.
On the basis of the technical scheme, the output end of the low-pressure cylinder exhaust steam temperature AI block of the first acquisition module and the output end of the low-pressure cylinder exhaust steam temperature AI block of the second acquisition module are respectively connected with the input end of a first large selection module, the output end of the first large selection module is connected with the input end of a limiting module, and the output end of the limiting module is connected with the input end of a PID calculation module PV; the output end of the first large selection module is also connected with a first setting module T end, a first setting module OP end is connected with a PID calculation module SP input end, a PID calculation module OUT output end is connected with a switching module P1 end, and a PID calculation module NOTA output end is connected with the first setting module S input end; the output end of the first large selection module is also connected with the input end of the first function module, and the output end of the first function module is connected with the input end of the second large selection module; the output end of an AI block of the set load of the unit is connected with the input end of a second function module, the output end of the second function module is connected with the input end of a second large selection module, the output end of the second large selection module is connected with the input end of a hysteresis module, the output end of the hysteresis module is connected with the input end of an adder, the output end of the hysteresis module is connected with the input end of a subtracter, a valve position feedback AI block of the low-pressure cylinder water spray regulating valve is connected with the input end of the subtracter, the output end of the subtracter is connected with a T port of a second setting block, the output end of the second setting block OP is connected with the input end of the adder, the output end of; the output end of an AGC input instruction DI block is connected with the input end of an AND gate module, the output end of a generator power AI block is connected with a port 1 of a selection module, the output Q end of the selection module is connected with the input end of the AND gate module, the output end of the AND gate module is connected with the input end of a NAND gate, and the output end of the NOT gate module is connected with the S end of a second setting module; and the output end of the AND gate module is connected with the S end of the switching module.
On the basis of the technical scheme, the first acquisition module low-pressure cylinder exhaust steam temperature AI block and the second acquisition module low-pressure cylinder exhaust steam temperature AI block are used for dynamically acquiring the actual temperature of low-pressure cylinder exhaust steam and reflecting the numerical value of the low-pressure cylinder exhaust steam temperature in real time; the set load AI block of the unit is used for dynamically acquiring the actual load instruction of the unit and reflecting the value of the actual load instruction of the unit in real time; the valve position feedback AI block of the low-pressure cylinder water spray regulating valve is used for dynamically acquiring the actual position feedback of the functional low-pressure cylinder water spray regulating valve and reflecting the numerical value of the actual position of the low-pressure cylinder water spray regulating valve in real time; the AGC input instruction DI block is used for dynamically acquiring an AGC actual input instruction and reflecting the AGC input state in real time; the generator power AI block is used for dynamically acquiring the actual load of the unit and reflecting the numerical value of the actual load of the unit in real time; the first large selection module and the second large selection module are used for comparing two input values, and the output value is the maximum value of the two values; the comparison module compares the input numerical value with a fixed numerical value, if the input numerical value is greater than or equal to the fixed numerical value, the output is a true value, and if the input numerical value is less than the fixed numerical value, the output is a false value; the first setting module and the second setting module manually set ideal values, and the modules have a tracking function, and tracking values are input values; the limiting module limits the input numerical value to the maximum numerical value and the minimum numerical value according to the limiting requirement; the first function module and the second function module are used for correspondingly obtaining an output value according to a certain slope and an input value; the AND gate module is used for judging input values, if the input values are true values, the output value is a true value, and if any one of the input values is not a true value, the output value is a false value; the PID calculation module is used for carrying out deviation calculation on the process numerical value and the set numerical value to obtain an output numerical value; the subtracter is used for carrying out subtraction calculation on the two input numerical values, and the output value is a numerical value obtained by subtracting the two numerical values; the NOT gate module is used for judging the input value, if the input value is a true value, the output value is a false value, and if the input value is a false value, the output value is a true value; the lag module is used for carrying out inertial processing calculation on the input numerical value according to preset time, and the output numerical value is the numerical value after the inertial processing; the adder is used for performing addition calculation on the two input numerical values, and the output value is a numerical value obtained by adding the two numerical values; the switching module is used for switching two input values, when the judgment condition is a true value, the output value is a second input value, and when the judgment condition is a false value, the output value is a first input value; and the low-pressure cylinder water spray regulating valve instruction AO block is a low-pressure cylinder water spray regulating valve actual position instruction and commands the opening position of the low-pressure cylinder water spray regulating valve in real time.
On the basis of the technical scheme, the first function module and the second function module are binary linear equations, namely output values are correspondingly obtained according to input values according to a certain slope.
On the basis of the technical scheme, the PID calculation module performs deviation calculation on the process numerical value and the set numerical value, and the deviation value is subjected to proportional multiplication calculation, integral calculation and differential calculation simultaneously to obtain an output numerical value.
The invention also provides a control method based on the system, which comprises the following steps: step 1: the output dynamic numerical value of the low-pressure cylinder exhaust steam temperature AI block of the first acquisition module and the output dynamic numerical value of the low-pressure cylinder exhaust steam temperature AI block of the second acquisition module are connected with the input end of the first large selection module to obtain the maximum value of the two numerical values, the output value of the first large selection module is connected with the input end of the limiting module to obtain the numerical value after numerical value limitation, and the output array of the limiting module is connected with the input end of the PV port of the process value of the PID calculation module; step 2: the output value of the first large selection module is connected with the input value of the T end of the first setting module, the output value of the OP end of the first setting module is connected with the SP end of the set value of the PID calculation module, the output value of the OUT end of the PID calculation module is connected with the input value P1 end of the switching module, and meanwhile, the output value of the NOTA end of the PID calculation module is connected with the input value S end of the first setting module; and step 3: the output value of the first large selection module is connected with the input end of the first function module to obtain the output value of which the input value is calculated according to a certain slope, and the output value of the first function module is connected with the input end of the second large selection module; and 4, step 4: the output dynamic numerical value of the set load AI block is connected with the input end of a second function module to obtain an output value of which the input value is calculated according to a certain slope, the output value of the second function module is connected with the input end of a second big selection module to obtain the maximum value of the two numerical values, the output value of the second big selection module is connected with the input end of a lag module to obtain an inertia calculation value according to preset time, the output value of the lag module is connected with the first input end of an adder, the output value of the OP end of a second setting block is connected with the second input end of the adder, and the first input numerical value and the second input numerical value of the adder are added to obtain an output numerical value of the adder; the output value of the adder is connected with the port P2 of the input value of the switching module; and 5: the output value of the hysteresis module is connected with a first input end of a subtracter, the output dynamic value of a valve position feedback AI block of the low-pressure cylinder water spray regulating valve is connected with a second input end of the subtracter, the output value of the subtracter is obtained after the subtraction of the first input value and the second input value of the subtracter, and the output value of the subtracter is connected with an input value T port of a second setting block; step 6: the output state value of an AGC input instruction DI block is connected with a first input end of an AND gate module, the output dynamic numerical value of a generator power AI block is connected with an input value port of a selection module and is compared with a fixed numerical value of the selection module to obtain an output value, an output value Q end of the selection module is connected with a second input end of the AND gate module to obtain an output value, the output value of the AND gate module is connected with an input end of a non-gate module to obtain an output value, and the output value of the non-gate module is connected with an input value S end of a second setting module; and 7: and the output value of the AND gate module is connected with the input value S end of the switching module, and the output value of the switching module is connected with the input end of the low-pressure cylinder water spray regulating valve instruction AO block to obtain the opening position of the low-pressure cylinder water spray regulating valve.
The invention has the beneficial effects that:
in the deep peak regulation process, when the low-pressure cylinder water spray control valve is automatically controlled, the actual preset value of the opening degree of the low-pressure cylinder water spray control valve is the preset value set by the low-pressure cylinder exhaust steam temperature, and the preset value set by the unit load instruction is used as the limit value of the low-pressure cylinder water spray control valve.
Drawings
Fig. 1 is a schematic diagram of a control system according to an embodiment of the present invention.
Reference numerals:
the system comprises a first acquisition module low-pressure cylinder exhaust steam temperature AI block, a second acquisition module low-pressure cylinder exhaust steam temperature AI block, a set load AI block for a unit 3, a low-pressure cylinder water spray regulating valve position feedback AI block for a unit 4, an AGC input instruction DI block for a unit 5, a generator power AI block for a unit 6, a first selection module for a unit 7, a comparison module for a unit 8, a first setting module for a unit 9, a limiting module for a unit 10, a first function module for a unit 11, a second function module for a unit 12, an AND gate module for a unit 13, a PID calculation module for a unit 14, a second selection module for a unit 15, a subtractor for a unit 16, a NOT gate module for a unit 17, a hysteresis module for a unit 18, a second setting module for a unit 19, an adder for a unit 20, a switching module for a unit 21, and a low-pressure.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout.
The technical scheme and the beneficial effects of the invention are clearer and clearer by further describing the specific embodiment of the invention with the accompanying drawings of the specification. The embodiments described below are exemplary and are intended to be illustrative of the invention, but are not to be construed as limiting the invention.
Referring to fig. 1, an embodiment of the present invention provides a control system for deep peak shaving low-pressure cylinder exhaust temperature, including a first acquisition module low-pressure cylinder exhaust temperature AI block 1, a second acquisition module low-pressure cylinder exhaust temperature AI block 2, a unit given load AI block 3, a low-pressure cylinder water spray regulating valve position feedback AI block 4, an AGC switch instruction DI block 5, a generator power AI block 6, a first large selection module 7, a comparison module 8, a first setting module 9, a limiting module 10, a first function module 11, a second function module 12, an and gate module 13, a PID calculation module 14, a second large selection module 15, a subtractor 16, a non-gate module 17, a hysteresis module 18, a second setting module 19, an adder 20, a switching module 21, and a low-pressure cylinder water spray regulating valve instruction AO block 22.
Specifically, the output end of a first acquisition module low-pressure cylinder exhaust steam temperature AI block 1 and the output end of a second acquisition module low-pressure cylinder exhaust steam temperature AI block 2 are respectively connected with the input end of a first large selection module 7, the output end of the first large selection module 7 is connected with the input end of a limiting module 10, and the output end of the limiting module 10 is connected with the input end of a PID calculation module 14 PV;
the output end of the first large selection module 7 is also connected with a first setting module 9T end, a first setting module 9OP end is connected with an input end of a PID calculation module 14SP, an output end of the PID calculation module 14OUT is connected with a switching module 21P1 end, and an output end of the PID calculation module 14NOTA is connected with an input end of the first setting module 9S;
the output end of the first large selection module 7 is also connected with the input end of a first function module 11, and the output end of the first function module 11 is connected with the input end of a second large selection module 15; the output end of the unit given load AI block 3 is connected with the input end of a second function module 12, the output end of the second function module 12 is connected with the input end of a second large selection module 15, the output end of the second large selection module 15 is connected with the input end of a hysteresis module 18, the output end of the hysteresis module 18 is connected with an adder 20, the output end of the hysteresis module 18 is connected with the input end of a subtracter 16, a low-pressure cylinder water spray regulating valve position feedback AI block 4 is connected with the input end of the subtracter 16, the output end of the subtracter 16 is connected with a second setting block T port, the output OP end of the second setting block is connected with the input end of the adder 20, the output end of the adder 20 is connected with a switching module 21P2 port, and the output;
the output end of an AGC input instruction DI block 5 is connected with the input end of an AND gate module 13, the output end of a generator power AI block 6 is connected with a port 1 of a selection module, the output Q end of the selection module is connected with the input end of the AND gate module, the output end of the AND gate module 13 is connected with the input end of a NAND gate, and the output end of a NOT gate module 17 is connected with an end 19S of a second setting module; and the output end of the and gate module 13 is connected with the end of the switching module 21S.
Specifically, the first acquisition module low-pressure cylinder exhaust steam temperature AI block 1 and the second acquisition module low-pressure cylinder exhaust steam temperature AI block 2 are used for dynamically acquiring the actual temperature of the low-pressure cylinder exhaust steam and reflecting the numerical value of the low-pressure cylinder exhaust steam temperature in real time;
the set load AI block 3 of the unit is used for dynamically acquiring the actual load instruction of the unit and reflecting the value of the actual load instruction of the unit in real time;
the valve position feedback AI block 4 of the low-pressure cylinder water spray regulating valve is used for dynamically acquiring the actual position feedback of the functional low-pressure cylinder water spray regulating valve and reflecting the value of the actual position of the low-pressure cylinder water spray regulating valve in real time;
an AGC input instruction DI block 5 is used for dynamically acquiring an AGC actual input instruction and reflecting the AGC input state in real time;
the generator power AI block 6 is used for dynamically acquiring the actual load of the unit and reflecting the numerical value of the actual load of the unit in real time;
the first large selection module 7 and the second large selection module 15 are used for comparing two input numerical values, and the output value is the maximum value of the two numerical values;
the comparison module 8 compares the input value with a fixed value, and outputs a true value if the input value is greater than or equal to the fixed value, and outputs a false value if the input value is less than the fixed value;
the first setting module 9 and the second setting module 19 are used for manually setting an ideal numerical value, and meanwhile, the modules have a tracking function, and the tracking value is an input value;
the limiting module 10 limits the input numerical value to the maximum numerical value and the minimum numerical value according to the limiting requirement;
the first function module 11 and the second function module 12 are used for obtaining an output value according to a certain slope and the input value correspondingly;
the and gate module 13 is configured to determine input values, where an output value is a true value if the input values are true values, and the output value is a false value if any one of the input values is not a true value;
the PID calculation module 14 is used for performing deviation calculation on the process value and the set value to obtain an output value;
the subtracter 16 is used for performing subtraction calculation on the two input numerical values, and the output value is a numerical value obtained by subtracting the two numerical values;
the not gate module 17 is configured to determine an input value, and if the input value is a true value, the output value is a false value, and if the input value is a false value, the output value is a true value;
the lag module 18 is used for performing inertial processing calculation on the input numerical value according to preset time, and the output numerical value is the numerical value after the inertial processing;
the adder 20 is configured to add two input values, and an output value is a value obtained by adding the two input values;
the switching module 21 is configured to switch two input values, where when the determination condition is a true value, the output value is a second input value, and when the determination condition is a false value, the output value is a first input value;
the low-pressure cylinder water spray regulating valve command AO block 22 is a low-pressure cylinder water spray regulating valve actual position command, and commands the opening position of the low-pressure cylinder water spray regulating valve in real time.
Specifically, the first function module 11 and the second function module 12 are binary linear equations, that is, output values are obtained according to a certain slope and input values.
Specifically, the PID calculation module 14 performs deviation calculation on the process value and the set value, and performs proportional multiplication, integral calculation, and differential calculation on the deviation value at the same time to obtain an output value.
The embodiment of the invention also provides a control method based on the system, which is characterized by comprising the following steps:
step 1: the output dynamic numerical value of the first acquisition module low-pressure cylinder exhaust steam temperature AI block 1 and the output dynamic numerical value of the second acquisition module low-pressure cylinder exhaust steam temperature AI block 2 are connected with the input end of a first large selection module 7 to obtain the maximum value of the two numerical values, the output value of the first large selection module 7 is connected with the input end of a limiting module 10 to obtain the numerical value after numerical value limitation, and the output array of the limiting module 10 is connected with the input end of a process value PV port of a PID calculation module 14;
step 2: the output value of the first large selection module 7 is connected with the T-end input value of the first setting module 9, the OP-end output value of the first setting module 9 is connected with the set value SP end of the PID calculation module 14, the OUT-end output value of the PID calculation module 14 is connected with the input value P1 end of the switching module 21, and the NOTA-end output value of the PID calculation module 14 is connected with the input value S end of the first setting module 9;
and step 3: the output value of the first large selection module 7 is connected with the input end of the first function module 11 to obtain the output value of which the input value is calculated according to a certain slope, and the output value of the first function module 11 is connected with the input end of the second large selection module 15;
and 4, step 4: the output dynamic numerical value of the unit given load AI block 3 is connected with the input end of the second function module 12 to obtain an output value of which the input value is calculated according to a certain slope, the output value of the second function module 12 is connected with the input end of the second big selection module 15 to obtain the maximum value of the two numerical values, the output value of the second big selection module 15 is connected with the input end of the lag module 18 to obtain an inertia calculation value according to preset time, the output value of the lag module 18 is connected with the first input end of the adder 20, the output value of the OP end of the second setting block is connected with the second input end of the adder 20, and the first input numerical value and the second input numerical value of the adder 20 are added to obtain an output numerical value of the adder 20; the output value of the adder 20 is connected to the port P2 of the input value of the switching module 21;
and 5: the output value of the hysteresis module 18 is connected with a first input end of a subtracter 16, the dynamic value output by the low-pressure cylinder water spray regulating valve position feedback AI block 4 is connected with a second input end of the subtracter 16, the output value of the subtracter 16 is obtained after the subtraction of the first input value and the second input value of the subtracter 16, and the output value of the subtracter 16 is connected with an input value T port of a second setting block;
step 6: the output state value of the AGC input instruction DI block 5 is connected with the first input end of the AND gate module 13, the output dynamic value of the generator power AI block 6 is connected with the input value port of the selection module, and is compared with the fixed value of the selection module to obtain an output value, the output value Q end of the selection module is connected with the second input end of the AND gate module to obtain an output value, the output value of the AND gate module 13 is connected with the input end of the NAND gate module 17 to obtain an output value, and the output value of the NOT gate module 17 is connected with the input value S end of the second setting module 19;
and 7: the output value of the and gate module 13 is connected with the input value S end of the switching module 21, and the output value of the switching module 21 is connected with the input end of the low pressure cylinder water spray regulating valve instruction AO block 22 to obtain the opening position of the low pressure cylinder water spray regulating valve.
When the low-pressure cylinder water spray control valve is automatically controlled, the actual preset value of the opening degree of the low-pressure cylinder water spray control valve is a preset value set by the low-pressure cylinder exhaust steam temperature, and the preset value set by the unit load instruction is used as a limit value of the low-pressure cylinder water spray control valve.
In the description of the specification, reference to the description of "one embodiment", "preferably", "an example", "a specific example" or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention, and schematic representations of the terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.

Claims (6)

1. A control system for deep peaking low pressure cylinder exhaust temperature, characterized by: the low-pressure cylinder exhaust steam temperature acquisition system comprises a first acquisition module low-pressure cylinder exhaust steam temperature AI block (1), a second acquisition module low-pressure cylinder exhaust steam temperature AI block (2), a set given load AI block (3), a low-pressure cylinder water spray regulating valve position feedback AI block (4), an AGC input instruction DI block (5), a generator power AI block (6), a first large selection module (7), a comparison module (8), a first setting module (9), a limiting module (10), a first function module (11), a second function module (12), an AND gate module (13), a PID calculation module (14), a second large selection module (15), a subtracter (16), a NOT gate module (17), a hysteresis module (18), a second setting module (19), an adder (20), a switching module (21) and a low-pressure cylinder water spray regulating valve instruction AO block (22).
2. The control system for deep peaking low pressure cylinder exhaust steam temperature of claim 1, wherein: the output end of a first acquisition module low-pressure cylinder exhaust steam temperature AI block (1) and the output end of a second acquisition module low-pressure cylinder exhaust steam temperature AI block (2) are respectively connected with the input end of a first large selection module (7), the output end of the first large selection module (7) is connected with the input end of a limiting module (10), and the output end of the limiting module (10) is connected with the PV input end of a PID calculation module (14);
the output end of the first large selection module (7) is also connected with a T end of a first setting module (9), an OP end of the first setting module (9) is connected with an SP input end of a PID calculation module (14), an OUT output end of the PID calculation module (14) is connected with a P1 end of a switching module (21), and an NOTA output end of the PID calculation module (14) is connected with an S input end of the first setting module (9);
the output end of the first large selection module (7) is also connected with the input end of a first function module (11), and the output end of the first function module (11) is connected with the input end of a second large selection module (15); the output end of the set load AI block (3) is connected with the input end of a second function module (12), the output end of the second function module (12) is connected with the input end of a second large selection module (15), the output end of the second large selection module (15) is connected with the input end of a hysteresis module (18), the output end of the hysteresis module (18) is connected with an adder (20), the output end of the hysteresis module (18) is connected with the input end of a subtracter (16), a low-pressure cylinder water spray regulating valve position feedback AI block (4) is connected with the input end of the subtracter (16), the output end of the subtracter (16) is connected with a second setting block T port, the output end OP of the second setting block is connected with the input end of the adder (20), the output end of the adder (20) is connected with a switching module (21) P2 port, and the output end of the switching module (21) is connected with;
the output end of an AGC input instruction DI block (5) is connected with the input end of an AND gate module (13), the output end of a generator power AI block (6) is connected with a port 1 of a selection module, the output Q end of the selection module is connected with the input end of the AND gate module, the output end of the AND gate module (13) is connected with the input end of a NAND gate, and the output end of a NOT gate module (17) is connected with the S end of a second setting module (19); the output end of the AND gate module (13) is connected with the S end of the switching module (21).
3. The control system for deep peaking low pressure cylinder exhaust steam temperature of claim 2, wherein: the first acquisition module low-pressure cylinder exhaust steam temperature AI block (1) and the second acquisition module low-pressure cylinder exhaust steam temperature AI block (2) are used for dynamically acquiring the actual temperature of low-pressure cylinder exhaust steam and reflecting the numerical value of the low-pressure cylinder exhaust steam temperature in real time;
the set load AI block (3) of the unit dynamically collects the actual load instruction of the unit and reflects the value of the actual load instruction of the unit in real time;
the valve position feedback AI block (4) of the low-pressure cylinder water spray regulating valve is used for dynamically acquiring the actual position feedback of the functional low-pressure cylinder water spray regulating valve and reflecting the numerical value of the actual position of the low-pressure cylinder water spray regulating valve in real time;
an AGC input instruction DI block (5) is used for dynamically acquiring an AGC actual input instruction and reflecting the AGC input state in real time;
the generator power AI block (6) dynamically acquires the actual load of the unit and reflects the value of the actual load of the unit in real time;
the first large selection module (7) and the second large selection module (15) are used for comparing two input numerical values, and the output value is the maximum value of the two numerical values;
the comparison module (8) compares the input numerical value with a fixed numerical value, if the input numerical value is greater than or equal to the fixed numerical value, the output is a true value, and if the input numerical value is less than the fixed numerical value, the output is a false value;
the first setting module (9) and the second setting module (19) are used for manually setting an ideal numerical value, and meanwhile, the modules have a tracking function, and the tracking value is an input value;
the limiting module (10) limits the input numerical value to the maximum numerical value and the minimum numerical value according to the limiting requirement;
the first function module (11) and the second function module (12) are used for correspondingly obtaining an output value according to an input value according to a certain slope;
the AND gate module (13) is used for judging input values, if the input values are true values, the output value is a true value, and if any one of the input values is not a true value, the output value is a false value;
the PID calculation module (14) is used for carrying out deviation calculation on the process numerical value and the set numerical value to obtain an output numerical value;
the subtracter (16) is used for carrying out subtraction calculation on the two input numerical values, and the output value is a numerical value obtained by subtracting the two numerical values;
the NOT gate module (17) is used for judging the input value, if the input value is a true value, the output value is a false value, and if the input value is a false value, the output value is a true value;
the hysteresis module (18) is used for carrying out inertial processing calculation on the input numerical value according to preset time, and the output numerical value is the numerical value after the inertial processing;
the adder (20) is used for carrying out addition calculation on the two input numerical values, and the output value is a numerical value obtained by adding the two numerical values;
the switching module (21) is used for switching two input values, when the judgment condition is a true value, the output value is a second input value, and when the judgment condition is a false value, the output value is a first input value;
and the low-pressure cylinder water spray regulating valve instruction AO block (22) is a low-pressure cylinder water spray regulating valve actual position instruction and commands the opening position of the low-pressure cylinder water spray regulating valve in real time.
4. The control system for deep peaking low pressure cylinder exhaust steam temperature of claim 3, wherein: the first function module (11) and the second function module (12) are binary linear equations, namely output values are correspondingly obtained according to input values according to a certain slope.
5. The control system for deep peaking low pressure cylinder exhaust steam temperature of claim 3, wherein: and the PID calculation module (14) performs deviation calculation on the process numerical value and the set numerical value, and the deviation value is subjected to proportional multiplication calculation, integral calculation and differential calculation at the same time to obtain an output numerical value.
6. A control method based on the system of claims 1-5, characterized by comprising the following steps:
step 1: the output dynamic numerical value of the first acquisition module low-pressure cylinder exhaust steam temperature AI block (1), the output dynamic numerical value of the second acquisition module low-pressure cylinder exhaust steam temperature AI block (2) and the input end of a first large selection module (7) are connected to obtain the maximum value of the two numerical values, the output value of the first large selection module (7) is connected with the input end of a limiting module (10) to obtain the numerical value after numerical value limitation, and the output array of the limiting module (10) is connected with the input end of a process value PV port of a PID calculation module (14);
step 2: the output value of the first large selection module (7) is connected with the T-end input value of the first setting module (9), the OP-end output value of the first setting module (9) is connected with the SP-end set value of the PID calculation module (14), the OUT-end output value of the PID calculation module (14) is connected with the P1-end input value of the switching module (21), and the NOTA-end output value of the PID calculation module (14) is connected with the S-end input value of the first setting module (9);
and step 3: the output value of the first large selection module (7) is connected with the input end of the first function module (11) to obtain the output value of which the input value is calculated according to a certain slope, and the output value of the first function module (11) is connected with the input end of the second large selection module (15);
and 4, step 4: the output dynamic numerical value of the set load AI block (3) is connected with the input end of a second function module (12) to obtain an output value of which the input value is calculated according to a certain slope, the output value of the second function module (12) is connected with the input end of a second big selection module (15) to obtain the maximum value of the two numerical values, the output value of the second big selection module (15) is connected with the input end of a lag module (18) to obtain an inertia calculation value according to preset time, the output value of the lag module (18) is connected with the first input end of an adder (20), the output value of the OP end of a second setting block is connected with the second input end of the adder (20), and the first input numerical value and the second input numerical value of the adder (20) are added to obtain the output numerical value of the adder (20); the output value of the adder (20) is connected with the port P2 of the input value of the switching module (21);
and 5: the output value of the hysteresis module (18) is connected with a first input end of a subtracter (16), the dynamic value output by the low-pressure cylinder water spray regulating valve position feedback AI block (4) is connected with a second input end of the subtracter (16), the output value of the subtracter (16) is obtained after the first input value and the second input value of the subtracter (16) are subtracted, and the output value of the subtracter (16) is connected with an input value T port of a second setting block;
step 6: the output state value of an AGC input instruction DI block (5) is connected with a first input end of an AND gate module (13), the output dynamic numerical value of a generator power AI block (6) is connected with an input value port of a selection module, and is compared with the fixed numerical value of the selection module to obtain an output value, the output value Q end of the selection module is connected with a second input end of the AND gate module to obtain an output value, the output value of the AND gate module (13) is connected with the input end of a NOT gate module (17) to obtain an output value, and the output value of the NOT gate module (17) is connected with the input value S end of a second setting module (19);
and 7: the output value of the AND gate module (13) is connected with the input value S end of the switching module (21), and the output value of the switching module (21) is connected with the input end of the low-pressure cylinder water spray regulating valve instruction AO block (22) to obtain the opening position of the low-pressure cylinder water spray regulating valve.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08121708A (en) * 1994-10-25 1996-05-17 Babcock Hitachi Kk Water spray controlling device of reheat steam system temperature decreasing device
US20120191427A1 (en) * 2010-09-20 2012-07-26 GM Global Technology Operations LLC System for diagnosing error conditions of a gas flow control system for turbocharged engines
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