CN116500990A - Coordinated control system and method of thermal power plant unit, thermal power plant unit and medium - Google Patents
Coordinated control system and method of thermal power plant unit, thermal power plant unit and medium Download PDFInfo
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Abstract
The invention discloses a coordination control system and method of a thermal power plant unit, the thermal power plant unit and a medium, wherein the system comprises: the unit control instruction module is used for acquiring an initial unit control signal and a target unit control signal; the load change determining module is used for determining the change amount of the control signal according to the initial unit control signal and the target unit control signal and generating a first control signal; the reference hysteresis module is used for delaying the formation time of the boiler coal quantity command to output a target unit control signal; the high selection module is used for outputting larger values in the unit control signal and the first control signal; and the air-coal ratio function module is used for generating a boiler air quantity command according to a larger value in the unit control signal and the first control signal, the boiler air quantity command is obtained through PID operation, and the time for generating the boiler air quantity command according to the first control signal is earlier than the formation time of the boiler air quantity command. The coordination control system provided by the embodiment of the invention can enable the effects of quick start and stop and quick load lifting to be better.
Description
Technical Field
The invention relates to the technical field of electric power correlation, in particular to a coordination control system and method of a thermal power plant unit, the thermal power plant unit and a medium.
Background
The key goal of the domestic thermal power flexibility transformation is to fully respond to the fluctuation change of the power system, and three goals of reducing the minimum output, quickly starting and stopping and quickly lifting the load are realized. The conventional flexibility modification of the 660MW thermal power plant unit is realized by basically adding a software logic configuration, such as adding the following logic:
(1) The output of the lowest layer 2 coal feeders A\E is added with a lower limit, the lower limit is set to be 20t/h, and when the main fuel control output is lower than 20, the load lock is reduced, so that the combustion stability of the lowest layer is ensured.
(2) When the load is lower than 40%, plasma ignition is put into the furnace, and the plasma ignition is favorable for combustion stability of the furnace.
(3) When the load is reduced to 500MW, 330MW and 280MW, the F coal mill, the C coal mill and the D coal mill are respectively stopped from top to bottom. And at the lowest load of 230MW, the lower 3 coal mills are kept to stably operate.
(4) When the load changes between 50% and 100%, the change rate is set to 10MW/min. When the load change is between 30% and 50%, the load change rate is changed to 7.3MW/min.
(5) And (5) boiler main control variable load feedforward optimization.
However, the above measures make the coordinated control configuration depth peak shaving achieve the effects of quick start-stop and quick load lifting.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a coordinated control system of a thermal power plant unit, which can enable the effects of quick start and stop and quick load lifting to be better.
The invention also provides a coordinated control method of the thermal power plant unit, a control device and a computer readable storage medium.
According to a first aspect of the embodiment of the invention, a coordination control system of a thermal power plant unit comprises:
the unit control instruction module is used for acquiring unit control signals, wherein the unit control signals comprise an initial unit control signal and a target unit control signal after the unit load changes;
the load change determining module is provided with a control signal input end and a control signal output end, the control signal input end is connected with the unit control command module, and is used for determining a control signal change amount according to the initial unit control signal and the target unit control signal and generating a first control signal according to the target unit control signal and the control signal change amount, wherein the first control signal is larger than the target unit control signal when the control signal change amount is positive, and the first control signal is smaller than the target unit control signal when the control signal change amount is negative;
The reference hysteresis module is provided with a hysteresis input end and a hysteresis output end, the hysteresis input end is connected with the unit control command module, and the reference hysteresis module is used for outputting the target unit control signal after the formation time of the boiler coal quantity command;
the high-selection module is provided with a first input end, a second input end and a high-selection output end, the first input end is connected with the hysteresis output end, the second input end is connected with the control signal output end, and the high-selection module is used for outputting larger values in the target unit control signal and the first control signal;
the input end of the wind-coal ratio function module is connected with the high-selection output end, and the wind-coal ratio function module is used for generating a boiler air volume instruction according to the target unit control signal and a larger value in the first control signal, wherein the boiler air volume instruction is obtained through PID operation, and the time for generating the boiler air volume instruction according to the first control signal is earlier than the formation time of the boiler air volume instruction.
The coordination control system of the thermal power plant unit provided by the embodiment of the invention has at least the following beneficial effects:
the unit control command module outputs a target unit control signal after the unit load changes, and the load change determining module can determine the control signal change before and after the unit load changes and generate a first control signal. The target unit control signal can be output after the formation time of the boiler coal quantity command through the reference hysteresis module. The high-selection module can output larger values in the target unit control signal and the first control signal, when the control signal variation is positive, the unit load is represented to be increased, and at the moment, the first control signal is larger than the target unit control signal, and the time for directly generating the boiler air quantity command according to the first control signal is shorter than the formation time of the boiler coal quantity command obtained through PID operation; when the control signal variation is negative, the unit load is represented to be reduced, at the moment, the first control signal is smaller than the target unit control signal, and the boiler air quantity command is generated according to the formation time of the target unit control signal lagging behind the boiler coal quantity command, so that the air charging and then the coal charging can be realized when the unit is loaded, the coal and then the air discharging can be realized when the unit is unloaded, the requirements of the variable load working condition can be rapidly tracked, and the coordination of the rapidity of the variable load can be realized. The coordination control system of the thermal power plant unit provided by the embodiment of the invention can enable the effects of quick start and stop and quick load lifting to be better.
According to some embodiments of the invention, the load change determination module comprises:
the input end of the first hysteresis module is connected with the unit control command module and is used for hysteresis output of the initial unit control signal;
the subtracter module is provided with a first subtraction input end, a second subtraction input end and a subtraction output end, wherein the first subtraction input end is used for inputting the target unit control signal, and the second subtraction input end is connected with the output end of the first hysteresis module;
the first adder module is provided with a first addition input end, a second addition input end and a first addition output end, wherein the first addition input end is used for inputting the target unit control signal, the second addition input end is connected with the subtraction output end, and the first addition output end is connected with the second input end.
According to some embodiments of the invention, further comprising:
the variable load air quantity feedforward module is used for outputting dynamic addition and subtraction, and the dynamic addition and subtraction is used for compensating air quantity instruction delay caused by action time difference of the boiler and the steam turbine in variable load;
the second adder module is provided with a third addition input end, a fourth addition input end and a second addition output end, the third addition input end is connected with the output end of the wind-coal ratio function module, the fourth addition input end is connected with the variable load air volume feedforward module, and the second adder module is used for carrying out air volume instruction compensation on the boiler air volume instruction through dynamic addition and subtraction so as to compensate air volume instruction delay caused by action time difference of the boiler and the steam turbine in variable load.
According to some embodiments of the invention, the crew control command module comprises:
the total fuel instruction module is used for outputting a total fuel control signal;
the boiler main control instruction module is used for outputting a boiler main control signal;
the conversion module is provided with a first selection end, a second selection end and a selection output end, wherein the first selection end is connected with the total fuel instruction module, the second selection end is connected with the boiler main control instruction module, the selection output end is respectively connected with the control signal input end and the hysteresis input end, and the conversion module is used for selecting one of the total fuel control signal and the boiler main control signal as a unit control signal and outputting the unit control signal through the selection output end.
According to some embodiments of the present invention, a linear module is further included between the boiler main control command module and the conversion module, and the linear module is configured to perform clipping processing on the unit control signal.
According to some embodiments of the invention, a second hysteresis module is also included between the total fuel command module and the conversion module.
According to some embodiments of the invention, a third hysteresis module is further included between the high selection module and the wind-to-coal ratio function module.
According to a second aspect of the present invention, a coordination control method for a thermal power plant unit is applied to a coordination control system for a thermal power plant unit according to the first aspect, and the coordination control method for a thermal power plant unit includes the following steps:
acquiring an initial unit control signal and a target unit control signal after unit load change;
determining a control signal variation according to the initial unit control signal and the target unit control signal;
generating a first control signal according to the target unit control signal and the control signal variation, wherein the first control signal is larger than the target unit control signal when the control signal variation is positive, and the first control signal is smaller than the target unit control signal when the control signal variation is negative;
executing an air quantity instruction generation strategy according to the target unit control signal and the first control signal, wherein the air quantity instruction generation strategy comprises a load increasing strategy and a load reducing strategy, and the load increasing strategy comprises the following steps of: generating a boiler air volume command according to the first control signal, wherein the boiler coal volume command is obtained through PID operation, and the time for generating the boiler air volume command according to the first control signal is earlier than the formation time of the boiler coal volume command; the load shedding strategy comprises the following steps: generating a boiler air quantity command according to the formation time of the target unit control signal lagging behind the boiler air quantity command, so that the air is added first and then the coal is added when the unit is loaded, and the coal is reduced first and then the air is reduced when the unit is loaded.
The coordination control method of the thermal power plant unit has at least the following beneficial effects:
the increase and decrease condition of the unit load can be judged by determining the positive and negative of the control signal variable quantity after the unit load is changed, the control signal variable quantity is positive to represent the unit load increase, and the time for directly generating the boiler air quantity command according to the first control signal is shorter than the formation time of the boiler coal quantity command obtained through PID operation; when the control signal variation is negative, the unit load is represented to be reduced, and the boiler air quantity command is generated according to the formation time of the target unit control signal lagging behind the boiler coal quantity command, so that the air charging and then the coal charging can be realized when the unit is loaded, the coal and then the air charging are realized when the unit is unloaded, the requirements of the variable load working condition can be rapidly tracked, and the coordination of the rapidity of the variable load can be realized. The coordination control method of the thermal power plant unit provided by the embodiment of the invention can enable the effects of quick start and stop and quick load lifting to be better.
According to some embodiments of the present invention, the executing an air volume command generating strategy according to the target unit control signal and the first control signal includes the following steps:
if the target unit control signal is smaller than the first control signal, executing the load increasing strategy;
And if the target unit control signal is greater than the first control signal, executing the load shedding strategy.
According to some embodiments of the present invention, the coordination control method of the thermal power plant unit further includes the following steps:
responding to a grinding starting configuration signal, and increasing a preset grinding starting coal feeding amount and a preset grinding starting water feeding amount, wherein the grinding starting configuration signal is used for representing the starting of a coal mill and a coal feeder;
and reducing the preset grinding stopping and coal feeding amount and the preset grinding stopping and water feeding amount in response to a grinding stopping configuration signal, wherein the grinding stopping configuration signal is used for representing that the coal mill or the coal feeder stops working.
According to some embodiments of the present invention, the coordination control method of the thermal power plant unit further includes the following steps:
acquiring the actual generator power of a unit;
and generating a variable load feedforward common instruction according to a preset target generator power and the actual generator power of the unit so as to correct the power deviation between the actual generator power of the unit and the target generator power.
According to some embodiments of the present invention, the coordination control method of the thermal power plant unit further includes the following steps:
acquiring actual main steam pressure of a unit;
and generating a variable load feedforward common instruction according to a preset target main steam pressure and the actual main steam pressure of the unit so as to correct the main steam pressure deviation between the actual main steam pressure of the unit and the target main steam pressure.
According to some embodiments of the present invention, the coordination control method of the thermal power plant unit further includes the following steps:
acquiring real-time actual temperature of the water-cooled wall;
if the change rate of the highest temperature in the actual temperatures of all the water-cooling walls in the water supply automation is controlled to exceed a preset normal threshold in a coordinated manner, a function relation value is obtained according to the change rate of the highest temperature according to a preset function relation and is superimposed on a water supply main control instruction, so that the water-cooling walls are prevented from bursting by adding water to reduce the sudden rise of the temperatures of the water-cooling walls, and the preset normal threshold represents that the change rate of the temperatures of the water-cooling walls exceeds a normal range.
According to some embodiments of the present invention, when the change rate of the highest temperature in the actual temperatures of all the water walls in the coordinated control input water supply automation exceeds a preset normal threshold, a function relation value is obtained according to a preset function relation according to the change rate of the highest temperature, and the function relation value is superimposed to a water supply main control instruction, the method further includes the following steps:
determining a temperature change rate according to the actual temperature of the water-cooled wall;
and if the temperature change rate exceeds a preset normal change rate range, executing the coordinated control to ensure that the change rate of the highest temperature in the actual temperatures of all the water cooling walls in the water supply automation exceeds a preset normal threshold, obtaining a functional relation value according to a preset functional relation according to the change rate of the highest temperature, and superposing the functional relation value to a water supply main control instruction.
According to some embodiments of the present invention, when the change rate of the highest temperature in the actual temperatures of all the water walls in the coordinated control input water supply automation exceeds a preset normal threshold, a function relation value is obtained according to a preset function relation according to the change rate of the highest temperature, and the function relation value is superimposed to a water supply main control instruction, the method further includes the following steps:
performing quality judgment according to the actual temperature of the water-cooled wall to obtain a quality judgment result;
and if the quality judgment result indicates that the actual temperature of the water-cooled wall is good, executing the coordination control, wherein the change rate of the highest temperature in the actual temperature of all the water-cooled walls in the water supply automation exceeds a preset normal threshold value, obtaining a functional relation value according to the change rate of the highest temperature according to a preset functional relation, and superposing the functional relation value to a water supply main control instruction.
An embodiment of a third aspect of the invention provides a thermal power plant comprising a coordinated control system of a thermal power plant according to the embodiment of the first aspect. The thermal power plant unit adopts all the technical schemes of the coordination control system of the thermal power plant unit of the embodiment, so that the thermal power plant unit has at least all the beneficial effects brought by the technical schemes of the embodiment.
The control device according to the fourth aspect of the embodiment of the invention comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the coordination control method of the thermal power plant unit according to the second aspect of the embodiment when executing the computer program. The control device adopts all the technical schemes of the coordination control method of the thermal power plant unit of the embodiment, so that the control device has at least all the beneficial effects brought by the technical schemes of the embodiment.
According to a fifth aspect of the embodiment of the present invention, a computer-readable storage medium stores computer-executable instructions for performing the coordinated control method of a thermal power plant according to the second aspect of the embodiment. The computer readable storage medium adopts all the technical schemes of the coordination control method of the thermal power plant unit of the embodiment, so that the method has at least all the beneficial effects brought by the technical schemes of the embodiment.
Additional features and advantages of the invention will be set forth 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 foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a partial system block diagram of a coordinated control system of a thermal power plant according to an embodiment of the present invention;
fig. 2 is a flowchart of a coordination control method of a thermal power plant according to an embodiment of the present invention.
Reference numerals:
a total fuel command module 110, a boiler main control command module 120, a conversion module 130, a linear module 140, a second hysteresis module 150;
a first hysteresis module 210, a subtractor module 220, a first adder module 230;
a reference hysteresis module 300;
a high selection module 400;
a wind-coal ratio function module 500;
a variable load air volume feedforward module 610 and a second adder module 620;
a third hysteresis module 700.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, the description of first, second, etc. is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, it should be understood that the direction or positional relationship indicated with respect to the description of the orientation, such as up, down, etc., is based on the direction or positional relationship shown in the drawings, is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the apparatus 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, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be determined reasonably by a person skilled in the art in combination with the specific content of the technical solution.
The coordinated control system of a thermal power plant according to the first aspect of the present invention will be clearly and completely described with reference to fig. 1 and 2, and it is apparent that the embodiments described below are some, but not all, embodiments of the present invention.
The coordination control system of the thermal power plant unit according to the embodiment of the first aspect of the invention comprises a unit control command module, a load change determining module, a reference hysteresis module 300, a high-selection module 400 and a wind-coal ratio function module 500.
The unit control instruction module is used for acquiring unit control signals, wherein the unit control signals comprise an initial unit control signal and a target unit control signal after the unit load is changed;
the load change determining module is provided with a control signal input end and a control signal output end, the control signal input end is connected with the unit control instruction module, and is used for determining a control signal change amount according to an initial unit control signal and a target unit control signal, generating a first control signal according to the target unit control signal and the control signal change amount, wherein the first control signal is larger than the target unit control signal when the control signal change amount is positive, and is smaller than the target unit control signal when the control signal change amount is negative;
the reference hysteresis module 300 is provided with a hysteresis input end and a hysteresis output end, wherein the hysteresis input end is connected with the unit control command module, and the reference hysteresis module 300 is used for outputting a target unit control signal after the formation time of the boiler coal quantity command;
The high-selection module 400 is provided with a first input end, a second input end and a high-selection output end, wherein the first input end is connected with the hysteresis output end, the second input end is connected with the control signal output end, and the high-selection module 400 is used for outputting larger values in the target unit control signal and the first control signal;
the input end of the wind-coal ratio function module 500 is connected with the high-selection output end, and the wind-coal ratio function module 500 is used for generating a boiler air volume command according to a larger value in a target unit control signal and a first control signal, wherein the boiler air volume command is obtained through PID operation, and the time for generating the boiler air volume command according to the first control signal is earlier than the formation time of the boiler air volume command.
The unit control command modules include a total fuel command module 110, a boiler master control command module 120, and a conversion module 130. A total fuel command module 110 for outputting a total fuel control signal; the boiler main control instruction module 120 is used for outputting a boiler main control signal; the conversion module 130 has a first selection end, a second selection end and a selection output end, the first selection end is connected with the total fuel command module 110, the second selection end is connected with the boiler main control command module 120, the selection output end is respectively connected with the control signal input end and the lag input end, and the conversion module 130 is used for selecting one of the total fuel control signal and the boiler main control signal as a unit control signal and outputting through the selection output end.
The increase and decrease of the unit load can increase and decrease the total fuel control signal and the boiler main control signal, and the boiler air volume command can be generated through the total fuel control signal and the boiler main control signal, and one of the total fuel control signal and the boiler main control signal can be arbitrarily selected as a basic signal of the boiler air volume command. Whether the total fuel control signal or the boiler master signal is output is selected by setting the conversion module 130. Specifically, when the conversion module 130 is set to the OFF state, the conversion module 130 outputs a boiler main control signal, and conversely, when the conversion module 130 is set to the ON state, the conversion module 130 outputs a total fuel control signal.
The load change determination module includes a first hysteresis module 210, a subtractor module 220, and a first adder module 230. The input end of the first hysteresis module 210 is connected with the unit control command module and is used for hysteresis output of an initial unit control signal; the subtractor module 220 has a first subtracting input for inputting the target unit control signal, a second subtracting input connected to the output of the first hysteresis module 210, and a subtracting output; the first adder module 230 has a first addition input end, a second addition input end and a first addition output end, wherein the first addition input end is used for inputting a target unit control signal, the second addition input end is connected with the subtraction output end, and the first addition output end is connected with the second input end.
When the unit load changes, the conversion module 130 outputs the target unit control signal to the first hysteresis module 210 and the subtractor module 220, and at this time, the first hysteresis module 210 hysteresis outputs the initial unit control signal before the last stored unit load changes, and stores the currently input target unit control signal. The hysteresis refers to that the initial unit control signal stored before the unit load changes is delayed until the current moment of inputting the target unit control signal after the unit load changes is output to the subtractor module 220. If the unit load increases, the initial unit control signal is smaller than the target unit control signal, the output value of the subtractor module 220 is the target unit control signal minus the initial unit control signal, and is a positive number, the output value of the first adder module 230 is the target unit control signal minus the initial unit control signal plus the target unit control signal, i.e. the first control signal is greater than the target unit control signal output by the reference hysteresis module 300, and at this time, the high-selection module 400 outputs the first control signal to the air-to-coal ratio function module 500 to generate a boiler air volume command. The boiler coal quantity command is obtained through PID operation, and the time for generating the boiler air quantity command according to the first control signal is earlier than the formation time of the boiler coal quantity command, so that the air and the coal can be added firstly when the unit increases the load.
If the unit load decreases, the initial unit control signal is greater than the target unit control signal, the output value of the subtractor module 220 is the target unit control signal minus the initial unit control signal, and is a negative number, the output value of the first adder module 230 is the target unit control signal minus the initial unit control signal plus the target unit control signal, that is, the first control signal is less than the target unit control signal output by the reference hysteresis module 300, at this time, the high selection module 400 outputs the target unit control signal output by the reference hysteresis module 300 to the air-coal ratio function module 500 to generate a boiler air volume command, and the reference hysteresis module 300 delays the formation time of the boiler air volume command to output the target unit control signal, thereby realizing that the coal is firstly subtracted and then the air is subtracted when the unit is in load reduction.
The conventional coal-air crossing limiting loop is realized by a coal-air crossing function, and the defect of the design is that when the unit is in a change of a variable load working condition, due to improper setting of the crossing function, when the unit is in coordination control and the load is greatly changed, the set value of coal feeding and the set value of air quantity of the unit cannot track the requirement of the variable load working condition, and the rapidity of coordination and load change is affected. The coordination control system of the thermal power plant unit can realize that the wind is firstly added and then the coal is added when the unit increases the load, and the coal is firstly reduced and then the wind is reduced when the unit decreases the load, can rapidly track the requirement of the variable load working condition, realizes the coordination of the rapidity of the variable load, and can ensure that the rapid start and stop and rapid load lifting effects are better.
It should be noted that, the boiler coal quantity command is obtained through PID operation, and the time consumption is longer than the time for generating the boiler air quantity command through the unit control command module, the load change determining module, the high selection module 400 and the air-coal ratio function module 500, and the specific time consumption time of the two is proved by experiments, so that the method has the basis of practical evidence, and the PID operation process is relatively more complex and takes longer time, which is known to those skilled in the art.
The process how the wind-coal ratio function module 500 generates the boiler air quantity command according to the first control signal or the target unit control signal is not described in detail herein, the working principle of the wind-coal ratio function module 500 is the prior art known to those skilled in the art, and the specific functionalization processing procedure can be implemented by selecting the prior art according to the actual situation, which is not limited herein.
In the embodiment of the present invention, the specific modules mentioned above are all common modules in the DCS system of the thermal power plant, and the specific working principle is the prior art known to those skilled in the art, and will not be described herein.
According to the coordinated control system of the thermal power plant unit, the unit control command module outputs the target unit control signal after the unit load changes, and the load change determining module can determine the control signal change before and after the unit load changes and generate the first control signal. The target unit control signal may be output by the reference hysteresis module 300 to be delayed from the formation time of the boiler coal level command. The high selection module 400 can output larger values of the target unit control signal and the first control signal, and when the control signal variation is positive, the unit load is represented to be increased, and the first control signal is larger than the target unit control signal, the time for directly generating the boiler air quantity instruction according to the first control signal is shorter than the formation time of the boiler coal quantity instruction obtained through PID operation; when the control signal variation is negative, the unit load is represented to be reduced, at the moment, the first control signal is smaller than the target unit control signal, and the boiler air quantity command is generated according to the formation time of the target unit control signal lagging behind the boiler coal quantity command, so that the air charging and then the coal charging can be realized when the unit is loaded, the coal and then the air discharging can be realized when the unit is unloaded, the requirements of the variable load working condition can be rapidly tracked, and the coordination of the rapidity of the variable load can be realized. The coordination control system of the thermal power plant unit provided by the embodiment of the invention can enable the effects of quick start and stop and quick load lifting to be better.
In some embodiments of the present invention, referring to FIG. 1, a variable load air volume feed forward module 610 and a second adder module 620 are also included. The variable load air volume feedforward module 610 is used for outputting dynamic addition and subtraction, and the dynamic addition and subtraction is used for compensating air volume command time delay caused by action time difference of the boiler and the steam turbine in variable load; the second adder module 620 has a third adding input end, a fourth adding input end and a second adding output end, the third adding input end is connected with the output end of the wind-coal ratio function module 500, the fourth adding input end is connected with the variable load wind volume feedforward module 610, and the second adder module 620 is used for performing wind volume command compensation on a boiler wind volume command through dynamic addition and subtraction so as to compensate wind volume command delay caused by action time difference between a boiler and a steam turbine in variable load. The variable load air volume feedforward module 610 can compensate the air volume command of the boiler through dynamic addition and subtraction, and overcomes the air volume command time delay caused by the action time difference between the boiler and the steam turbine in variable load.
In some embodiments of the present invention, referring to fig. 1, a linear module 140 is further included between the boiler main control command module 120 and the conversion module 130, where the linear module 140 is configured to perform clipping processing on the unit control signal. The clipping processing of the unit control signals can prevent the overload of the unit control signals and ensure the signal quality of the unit control signals. The operation principle of the linear module 140 is known to those skilled in the art, and will not be described herein. The specific model of the linear module 140 may be selected according to actual needs, and is not limited herein.
In some embodiments of the present invention, referring to FIG. 1, a second hysteresis module 150 is also included between the total fuel command module 110 and the conversion module 130. The second hysteresis module 150 is configured to hysteresis the output total fuel control signal, so that the total fuel control signal can be smoother, and the signal quality of the total fuel control signal can be ensured.
In some embodiments of the invention, referring to FIG. 1, a third hysteresis module 700 is also included between the high selection module 400 and the wind-to-coal ratio function module 500. The third hysteresis module 700 is configured to hysteresis and output the target unit control signal or the first control signal, so that the target unit control signal or the first control signal is smoother, and the signal quality of the target unit control signal or the first control signal is ensured.
In some embodiments of the invention, an economizer feed water bypass line is provided adjacent the feed water line, and an electrically actuated shut-off valve, an electrically actuated regulator valve, a flow measurement device, a flow transmitter, and a thermocouple are provided on the economizer feed water bypass line. The electric shutoff valve has the function of switching on and off the water supply of the water supply bypass pipeline of the economizer under low load, and the electric regulating valve has the function of regulating the water supply flow under low load. The flow measuring device, the flow transmitter and the thermocouple are used for detecting the water supply flow and the temperature on the water supply bypass pipeline of the economizer.
When the unit runs under low load, in order to reduce the heat absorption capacity of water passing through the economizer, the electric shutoff valve of the main circuit is closed, the electric shutoff valve of the economizer water supply bypass pipeline is opened, and meanwhile, the water supply flow is controlled in real time through the electric regulating valve of the economizer water supply bypass pipeline, and the flow measuring device, the flow transmitter and the thermocouple on the economizer water supply bypass pipeline can detect the water supply flow and the temperature on the economizer water supply bypass pipeline in real time. Most of the water supply and the flue gas exchange heat through the economizer, and when the water supply does not pass through the economizer, most of the heat of the flue gas cannot be taken away by the water supply, so that the temperature of the flue gas at the denitration inlet cannot be reduced along with the reduction of the load, and the denitration effect can be improved.
In some embodiments, the low main fuel trip protection condition and set point for the feed water flow in the inlet pipe of the economizer is deleted and the low main fuel trip protection for the feed water flow in the outlet pipe of the economizer is increased because the feed water does not pass through the economizer.
In some embodiments of the invention, a dynamic and static separator of the coal mill, a lubricating oil pump motor of the separator of the coal mill, a cooling fan of the motor of the separator of the coal mill and a frequency converter of the dynamic and static separator of the coal mill are arranged in the coal mill of the boiler. The dynamic-static separator is a controllable centrifugal separator. The motor lubrication system of the dynamic and static separator of the coal mill consists of a dry oil pump, a motor, an oil storage tank and a pipeline and is used for lubricating a bearing in a driving device. The cooling fan of the separator motor of the coal mill is used for cooling the lubricating oil pump motor of the separator of the coal mill. The dynamic and static separator driving device of the coal mill is connected with the variable frequency motor through a belt and is used for realizing the rotation of the rotary impeller. The dynamic and static separator frequency converter of the coal mill has the function of adjusting the rotation speed of the rotating impeller, the rotation speed of the impeller is adjustable in the whole operation process, and the fineness of the coal powder has a functional relation with the rotation speed of the separator blades. The optimum operating speed of the rotating impeller should be determined by performance experiments.
Raw coal is ground into coal powder by a grinding roller, dried by primary hot air and then conveyed into a dynamic-static separator of a coal mill along with airflow. Stationary blades arranged outside the coal dust separation core area uniformly distribute coal dust and gas mixtures containing particles with different sizes and enter the coal dust separation core area of the dynamic-static separator of the coal mill tangentially. The rotating impeller of the separator is positioned at the inner side of the pulverized coal separation core area, the rotating direction is consistent with the tangential airflow direction, and a key centrifugal force is provided for realizing the pulverized coal selection function of the dynamic and static separator of the coal mill. The magnitude of the centrifugal force can be controlled by adjusting the frequency of the frequency converter of the dynamic and static separator of the coal mill. The pulverized coal with different sizes of particles in the pulverized coal separation core area is subjected to centrifugal force with different sizes due to different self masses (particle sizes), the pulverized coal with large particles moves outwards under the action of the centrifugal force, impacts on stationary blades and returns to a millstone for secondary grinding through a powder return cone under the action of gravity, and the pulverized coal with qualified fineness passes through the rotating impeller blades and enters a boiler for combustion through a pulverized coal pipeline through a powder outlet pipe of a distributor.
In order to meet the stable combustion technology under low load, a dynamic and static separator of the coal mill is added, the dynamic and static separator has better uniformity and finer coal powder than the coal powder of the static separator, is more beneficial to the full combustion of the coal powder in a boiler furnace, can improve the combustion efficiency of the boiler under low load and reduce NO x CO and CO 2 Is beneficial to environmental protection.
In some embodiments of the invention, the primary air temperature equipment is additionally provided with the electric gate valve from three sections of steam extraction to the inlet of the heater, the regulating valve from three sections of steam extraction to the inlet of the heater, the electric gate valve from three sections of steam extraction to the outlet of the heater and the electric gate for regulating the primary air inlet of the heater, so that the primary air temperature under low load can be improved, and the combustion working condition effect can be improved.
The electric gate valve from the three-section steam extraction to the inlet of the heater has the function of controlling the on-off of the steam from the three-section steam extraction to the steam used by the heater through a switch valve. The inlet regulating valve of the three-section steam extraction to air heater has the function of controlling the steam consumption of the three-section steam extraction to air heater by regulating the opening of the valve. The electric gate valve from the three-section steam extraction to the outlet of the heater is used for controlling the on-off of the return of the steam from the heater to the three-section steam extraction. The primary air inlet of the air heater is used for adjusting the electric door, and the primary air quantity of the air heater is determined by adjusting the valve.
The electric gate valve is connected with the air inlet of the air heater, and the air inlet regulating valve is connected with the air inlet of the air heater; the primary air quantity can be regulated by regulating an electric door through a primary air inlet of the air heater, and three sections of steam extraction are performed to an inlet regulating valve of the air heater to automatically regulate the primary air temperature under low load.
In some embodiments of the invention, a variable frequency vacuum pump is added on the basis of the original three vacuum pumps of the unit, and the variable frequency vacuum pump comprises a main vacuum pump variable frequency, a secondary vacuum pump variable frequency and a tertiary vacuum pump variable frequency corresponding to the original three vacuum pumps, so that a low-pressure cylinder can adjust a vacuum set value under low load.
In some embodiments of the invention, the superheat degree of the unit is increased when the load is changed, and the heat-reducing water flow for the heat-reducing water is used for correcting the feedforward configuration of the main control of the boiler so as to achieve the purposes of reducing the heat-reducing water and reducing the main control output of the boiler at the same time, thereby maintaining the superheat degree within a reasonable range. It should be noted that the specific configuration may be set according to practical situations, and is not limited herein.
The coordinated control system of the thermal power plant unit improves the effect of unit depth peak shaving by adding corresponding equipment, integrally applies all equipment to the same thermal power plant unit, has a guiding effect on flexible modification of other thermal power plant units, improves the wide load denitration effect of the boiler side, improves the low load stable combustion effect of the boiler side, improves the vacuum condition under the condition of depth peak shaving, and has more obvious effects of reducing minimum output, quick start-stop, quick load lifting and the like under the condition of depth peak shaving.
A coordinated control method of a thermal power plant according to a second aspect of the present invention will be clearly and completely described with reference to fig. 1 and 2, and it is apparent that the embodiments described below are some, but not all, embodiments of the present invention.
According to a second aspect of the present invention, a coordination control method for a thermal power plant unit is applied to the coordination control system for a thermal power plant unit according to the first aspect, and the coordination control method for a thermal power plant unit includes the following steps:
acquiring an initial unit control signal and a target unit control signal after unit load change;
determining a control signal variation according to the initial unit control signal and the target unit control signal;
generating a first control signal according to the target unit control signal and the control signal variation, wherein the first control signal is larger than the target unit control signal when the control signal variation is positive, and the first control signal is smaller than the target unit control signal when the control signal variation is negative;
executing an air quantity instruction generation strategy according to a target unit control signal and a first control signal, wherein the air quantity instruction generation strategy comprises a load increasing strategy and a load reducing strategy, and the load increasing strategy comprises the following steps of: generating a boiler air volume command according to the first control signal, wherein the boiler coal volume command is obtained through PID operation, and the time for generating the boiler air volume command according to the first control signal is earlier than the formation time of the boiler coal volume command; the load shedding strategy comprises the following steps: generating a boiler air quantity command according to the forming time of a target unit control signal lagging behind the boiler coal quantity command, so that the air is added first and then the coal is added when the unit is loaded, and the coal is reduced first and then the air is reduced when the unit is loaded.
Executing an air quantity instruction generation strategy according to a target unit control signal and a first control signal, wherein the method comprises the following steps of: if the target unit control signal is smaller than the first control signal, executing a load increasing strategy; and if the target unit control signal is greater than the first control signal, executing a load shedding strategy.
When the unit load changes, the conversion module 130 outputs the target unit control signal to the first hysteresis module 210 and the subtractor module 220, and at this time, the first hysteresis module 210 hysteresis outputs the initial unit control signal before the last stored unit load changes, and stores the currently input target unit control signal. The hysteresis refers to that the initial unit control signal stored before the unit load changes is delayed until the current moment of inputting the target unit control signal after the unit load changes is output to the subtractor module 220. If the unit load increases, the initial unit control signal is smaller than the target unit control signal, the output value of the subtractor module 220 is the target unit control signal minus the initial unit control signal, and is a positive number, the output value of the first adder module 230 is the target unit control signal minus the initial unit control signal plus the target unit control signal, i.e. the first control signal is greater than the target unit control signal output by the reference hysteresis module 300, and at this time, the high-selection module 400 outputs the first control signal to the air-to-coal ratio function module 500 to generate a boiler air volume command. The boiler coal quantity command is obtained through PID operation, and the time for generating the boiler air quantity command according to the first control signal is earlier than the formation time of the boiler coal quantity command, so that the air and the coal can be added firstly when the unit increases the load.
If the unit load decreases, the initial unit control signal is greater than the target unit control signal, the output value of the subtractor module 220 is the target unit control signal minus the initial unit control signal, and is a negative number, the output value of the first adder module 230 is the target unit control signal minus the initial unit control signal plus the target unit control signal, that is, the first control signal is less than the target unit control signal output by the reference hysteresis module 300, at this time, the high selection module 400 outputs the target unit control signal output by the reference hysteresis module 300 to the air-coal ratio function module 500 to generate a boiler air volume command, and the reference hysteresis module 300 delays the formation time of the boiler air volume command to output the target unit control signal, thereby realizing that the coal is firstly subtracted and then the air is subtracted when the unit is in load reduction.
The conventional coal-air crossing limiting loop is realized by a coal-air crossing function, and the defect of the design is that when the unit is in a change of a variable load working condition, due to improper setting of the crossing function, when the unit is in coordination control and the load is greatly changed, the set value of coal feeding and the set value of air quantity of the unit cannot track the requirement of the variable load working condition, and the rapidity of coordination and load change is affected. The coordination control system of the thermal power plant unit can realize that the wind is firstly added and then the coal is added when the unit increases the load, and the coal is firstly reduced and then the wind is reduced when the unit decreases the load, can rapidly track the requirement of the variable load working condition, realizes the coordination of the rapidity of the variable load, and can ensure that the rapid start and stop and rapid load lifting effects are better.
According to the coordination control method of the thermal power plant unit, provided by the embodiment of the invention, the increase and decrease condition of the unit load can be judged by determining the positive and negative of the control signal variation after the unit load is changed, the control signal variation is positive to represent the unit load increase, and the time for directly generating the boiler air quantity instruction according to the first control signal is shorter than the formation time of the boiler coal quantity instruction obtained through PID operation; when the control signal variation is negative, the unit load is represented to be reduced, and the boiler air quantity command is generated according to the formation time of the target unit control signal lagging behind the boiler coal quantity command, so that the air charging and then the coal charging can be realized when the unit is loaded, the coal and then the air charging are realized when the unit is unloaded, the requirements of the variable load working condition can be rapidly tracked, and the coordination of the rapidity of the variable load can be realized. The coordination control method of the thermal power plant unit provided by the embodiment of the invention can enable the effects of quick start and stop and quick load lifting to be better.
In some embodiments of the present invention, the coordination control method of the thermal power plant unit further includes the following steps:
responding to a grinding starting configuration signal, and increasing a preset grinding starting coal feeding amount and a preset grinding starting water feeding amount, wherein the grinding starting configuration signal is used for representing the starting of the coal mill and the coal feeder;
And reducing the preset grinding stopping and coal feeding amount and the preset grinding stopping and water feeding amount in response to a grinding stopping configuration signal, wherein the grinding stopping configuration signal is used for representing that the coal mill or the coal feeder stops working.
In the process of deep peak regulation and load lifting of the unit, the speed of load change is influenced by the opening degree of the gas turbine regulating valve on one hand, and is greatly dependent on the change of coal feeding and water feeding, namely the change of the coal feeding and water feeding quantity under the condition that the water-coal ratio is kept unchanged, especially in the process of starting and stopping the coal mill aiming at deep peak regulation. The coal mill and the coal feeder operate simultaneously to generate a mill starting configuration signal, and when any one of the operation signals of the coal mill and the coal feeder does not exist, the operation signals cannot be considered as mill starting. The stop-grinding configuration signal may be non-start-grinding configuration signal. When the coal mill and the coal feeder are started and stopped, the effect of quickly adding and subtracting the coal feeding of the start-stop coal mill can be achieved by adding and subtracting a certain amount of coal feeding and water feeding in advance, so that the quick lifting load is realized.
The time constant pulse module can set the time for adding and subtracting coal and water supply, and the preset starting and grinding coal feeding amount and the preset starting and grinding water feeding amount can be output to the fuel main control module through the adder module. The pulse time and the magnitude of the addition and subtraction of the feed water and the feed water are finally obtained by the on-site actual test effect, and are not particularly limited herein.
In some embodiments of the present invention, the coordination control method of the thermal power plant unit further includes the following steps:
acquiring the actual generator power of the unit and the actual main steam pressure of the unit;
and generating a variable load feedforward common instruction according to the preset target generator power and the preset target main steam pressure and the preset actual main steam pressure of the unit so as to correct the power deviation between the actual generator power of the unit and the target generator power and the main steam pressure deviation between the actual main steam pressure of the unit and the target main steam pressure.
The load-variable feedforward common instruction is a loop for achieving water supply instruction, fuel instruction, total air quantity instruction, primary air pressure instruction, feedforward of temperature-reducing water regulating door at each stage and feedforward of hot air regulating door of coal mill. After the machine set command is changed, the respective regulating command is changed in advance by the water supply, fuel, total air quantity, primary air pressure, temperature reduction water regulating valve and hot air regulating valve of the coal mill, and meanwhile, the boiler combustion efficiency is changed rapidly by the coordinated action, so that the dynamic energy balance of the machine set is maintained. The configuration of the conventional variable load feedforward common instruction generally takes the differential quantity of the load instruction as a reference quantity, and the slope of the target power of the unit and the amplitude of the load are subjected to specific logic operation to obtain the advanced acceleration value regulated by the dynamic process, but the accuracy is not very high yet. According to the coordination control method of the thermal power plant unit, the variable load feedforward common instruction accuracy obtained by correcting the power deviation between the actual generator power of the unit and the target generator power and correcting the main steam pressure deviation between the actual main steam pressure of the unit and the target main steam pressure is high, the boiler can be better dynamically accelerated to adapt to different operation conditions, the boiler output, the pressure and the temperature reaction time are shortened, and the coordination work with a steam turbine is better, so that the aim of rapidly lifting the load is fulfilled.
In some embodiments, the variable load feed forward common command output is zero if the power deviation is less than a preset normal power deviation range and the main vapor pressure deviation is less than a preset normal main vapor pressure range.
It should be noted that, the power deviation and the main steam pressure deviation may be corrected by the multiplier module, and the specific principle is the prior art known to those skilled in the art, and will not be described herein. In addition, other function modules may be employed to correct the power bias and the main vapor pressure bias and are not to be construed as limiting the invention.
In some embodiments of the present invention, the coordination control method of the thermal power plant unit further includes the following steps:
acquiring real-time actual temperature of the water-cooled wall;
if the change rate of the highest temperature in the actual temperatures of all the water-cooling walls in the water supply automation is controlled to exceed a preset normal threshold in a coordinated manner, a function relation value is obtained according to the change rate of the highest temperature according to a preset function relation and is superimposed on a water supply main control instruction, so that the water-cooling walls are prevented from bursting by adding water to reduce the sudden rise of the temperature of the water-cooling walls, and the preset normal threshold represents that the change rate of the temperature of the water-cooling walls exceeds a normal range.
In the process of changing load, the water-cooled wall temperature is often too high, so that the possibility of tube explosion of the boiler is caused, and the coordinated control method of the thermal power plant unit reduces the temperature of the water-cooled wall by adding water, improves the safety protection effect of the water-cooled wall of the coal-fired unit in deep peak regulation, and has a guiding effect on the safety protection of the water-cooled wall of other coal-fired units.
In some embodiments of the present invention, when the rate of change of the highest temperature in the actual temperatures of all water walls in the automatic water supply input coordinated control exceeds a preset normal threshold, a functional relation value is obtained according to a preset functional relation according to the rate of change of the highest temperature, and the functional relation value is superimposed to the water supply main control instruction, the method further includes the following steps:
determining the temperature change rate according to the actual temperature of the water-cooled wall;
if the temperature change rate exceeds the preset normal change rate range, executing coordinated control to ensure that the change rate of the highest temperature in the actual temperatures of all water-cooled walls in the water supply automation exceeds a preset normal threshold value, obtaining a function relation value according to a preset function relation according to the change rate of the highest temperature, and superposing the function relation value to a water supply main control instruction.
If the temperature change rate is not within the preset normal change rate range, the temperature change is abnormal, and accidents such as pipe explosion and the like of the thermodynamic system can occur, so that the water supply control needs to be adjusted in time.
In some embodiments of the present invention, when the rate of change of the highest temperature in the actual temperatures of all water walls in the automatic water supply input coordinated control exceeds a preset normal threshold, a functional relation value is obtained according to a preset functional relation according to the rate of change of the highest temperature, and the functional relation value is superimposed to the water supply main control instruction, the method further includes the following steps:
Judging the quality according to the actual temperature of the water-cooled wall to obtain a quality judgment result;
if the quality judgment result indicates that the actual temperature of the water-cooled wall is good, performing coordinated control to ensure that the change rate of the highest temperature in the actual temperatures of all the water-cooled walls in the water supply automation exceeds a preset normal threshold, obtaining a functional relation value according to a preset functional relation according to the change rate of the highest temperature, and superposing the functional relation value to a water supply main control instruction.
If the quality judgment result indicates that the actual temperature of the water-cooled wall is a dead point, the temperature is abnormal, the thermal temperature measuring element fails, and the point does not participate in the comparison of the highest temperature in the temperature of the water-cooled wall. It should be noted that, the quality judgment is implemented by the quality judgment module, and the specific working principle is the prior art known to those skilled in the art, and will not be described herein.
In some embodiments, the maximum value of the actual temperature of the water-cooled wall is finally obtained after the actual temperature of the water-cooled wall is subjected to temperature change rate judgment and quality judgment. When the change rate of the highest temperature of the actual temperature of the water-cooled wall is larger than a preset normal threshold value in the automatic water supply in the deep peak regulation process, the value is directly overlapped to a water supply main control instruction after the function limiting, so that the change rate of the temperature of the water-cooled wall is overhigh, the temperature of the water-cooled wall is lowered by adding water, and the safety protection of the temperature overtemperature of the water-cooled wall under the deep peak regulation is realized.
A thermal power plant according to an embodiment of a third aspect of the present invention includes the coordination control system of the thermal power plant according to the embodiment of the first aspect. The thermal power plant unit adopts all the technical schemes of the coordination control system of the thermal power plant unit of the embodiment, so that the thermal power plant unit has at least all the beneficial effects brought by the technical schemes of the embodiment.
In addition, an embodiment of the fourth aspect of the present invention further provides a control device, including: memory, a processor, and a computer program stored on the memory and executable on the processor. The processor and the memory may be connected by a bus or other means.
The memory, as a non-transitory computer readable storage medium, may be used to store non-transitory software programs as well as non-transitory computer executable programs. In addition, the memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory optionally includes memory remotely located relative to the processor, the remote memory being connectable to the processor through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The non-transitory software program and instructions required to implement the coordinated control method of a thermal power plant of the above embodiment are stored in the memory, and when executed by the processor, the coordinated control method of a thermal power plant of the above embodiment is executed.
The above described apparatus embodiments are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
Further, the fifth aspect of the present invention provides a computer-readable storage medium storing computer-executable instructions that are executed by a processor or a controller, for example, by a processor of the control apparatus, so that the processor performs the coordinated control method of the thermal power plant in the above embodiment.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.
Claims (10)
1. The coordination control system of the thermal power plant unit is characterized by comprising the following steps of:
the unit control instruction module is used for acquiring unit control signals, wherein the unit control signals comprise an initial unit control signal and a target unit control signal after the unit load changes;
the load change determining module is provided with a control signal input end and a control signal output end, the control signal input end is connected with the unit control command module, and is used for determining a control signal change amount according to the initial unit control signal and the target unit control signal and generating a first control signal according to the target unit control signal and the control signal change amount, wherein the first control signal is larger than the target unit control signal when the control signal change amount is positive, and the first control signal is smaller than the target unit control signal when the control signal change amount is negative;
The reference hysteresis module is provided with a hysteresis input end and a hysteresis output end, the hysteresis input end is connected with the unit control command module, and the reference hysteresis module is used for outputting the target unit control signal after the formation time of the boiler coal quantity command;
the high-selection module is provided with a first input end, a second input end and a high-selection output end, the first input end is connected with the hysteresis output end, the second input end is connected with the control signal output end, and the high-selection module is used for outputting larger values in the target unit control signal and the first control signal;
the input end of the wind-coal ratio function module is connected with the high-selection output end, and the wind-coal ratio function module is used for generating a boiler air volume instruction according to the target unit control signal and a larger value in the first control signal, wherein the boiler air volume instruction is obtained through PID operation, and the time for generating the boiler air volume instruction according to the first control signal is earlier than the formation time of the boiler air volume instruction.
2. The coordinated control system of a thermal power plant according to claim 1, wherein the load change determination module comprises:
The input end of the first hysteresis module is connected with the unit control command module and is used for hysteresis output of the initial unit control signal;
the subtracter module is provided with a first subtraction input end, a second subtraction input end and a subtraction output end, wherein the first subtraction input end is used for inputting the target unit control signal, and the second subtraction input end is connected with the output end of the first hysteresis module;
the first adder module is provided with a first addition input end, a second addition input end and a first addition output end, wherein the first addition input end is used for inputting the target unit control signal, the second addition input end is connected with the subtraction output end, and the first addition output end is connected with the second input end.
3. The coordinated control system of a thermal power plant according to claim 1, further comprising:
the variable load air quantity feedforward module is used for outputting dynamic addition and subtraction, and the dynamic addition and subtraction is used for compensating air quantity instruction delay caused by action time difference of the boiler and the steam turbine in variable load;
the second adder module is provided with a third addition input end, a fourth addition input end and a second addition output end, the third addition input end is connected with the output end of the wind-coal ratio function module, the fourth addition input end is connected with the variable load air volume feedforward module, and the second adder module is used for carrying out air volume instruction compensation on the boiler air volume instruction through dynamic addition and subtraction so as to compensate air volume instruction delay caused by action time difference of the boiler and the steam turbine in variable load.
4. The coordinated control system of a thermal power plant according to claim 1, wherein the plant control instruction module includes:
the total fuel instruction module is used for outputting a total fuel control signal;
the boiler main control instruction module is used for outputting a boiler main control signal;
the conversion module is provided with a first selection end, a second selection end and a selection output end, wherein the first selection end is connected with the total fuel instruction module, the second selection end is connected with the boiler main control instruction module, the selection output end is respectively connected with the control signal input end and the hysteresis input end, and the conversion module is used for selecting one of the total fuel control signal and the boiler main control signal as a unit control signal and outputting the unit control signal through the selection output end.
5. A coordinated control method of a thermal power plant unit, characterized by being applied to the coordinated control system of a thermal power plant unit according to any one of claims 1 to 4, the coordinated control method of a thermal power plant unit comprising the steps of:
acquiring an initial unit control signal and a target unit control signal after unit load change;
determining a control signal variation according to the initial unit control signal and the target unit control signal;
Generating a first control signal according to the target unit control signal and the control signal variation, wherein the first control signal is larger than the target unit control signal when the control signal variation is positive, and the first control signal is smaller than the target unit control signal when the control signal variation is negative;
executing an air quantity instruction generation strategy according to the target unit control signal and the first control signal, wherein the air quantity instruction generation strategy comprises a load increasing strategy and a load reducing strategy, and the load increasing strategy comprises the following steps of: generating a boiler air volume command according to the first control signal, wherein the boiler coal volume command is obtained through PID operation, and the time for generating the boiler air volume command according to the first control signal is earlier than the formation time of the boiler coal volume command; the load shedding strategy comprises the following steps: generating a boiler air quantity command according to the formation time of the target unit control signal lagging behind the boiler air quantity command, so that the air is added first and then the coal is added when the unit is loaded, and the coal is reduced first and then the air is reduced when the unit is loaded.
6. The coordinated control method of a thermal power plant according to claim 5, wherein the executing an air volume instruction generating strategy according to the target plant control signal and the first control signal comprises the steps of:
If the target unit control signal is smaller than the first control signal, executing the load increasing strategy;
and if the target unit control signal is greater than the first control signal, executing the load shedding strategy.
7. The coordinated control method of a thermal power plant according to claim 5, characterized in that the coordinated control method of a thermal power plant further comprises the steps of:
responding to a grinding starting configuration signal, and increasing a preset grinding starting coal feeding amount and a preset grinding starting water feeding amount, wherein the grinding starting configuration signal is used for representing the starting of a coal mill and a coal feeder;
and reducing the preset grinding stopping and coal feeding amount and the preset grinding stopping and water feeding amount in response to a grinding stopping configuration signal, wherein the grinding stopping configuration signal is used for representing that the coal mill or the coal feeder stops working.
8. The coordinated control method of a thermal power plant according to claim 5, characterized in that the coordinated control method of a thermal power plant further comprises the steps of:
acquiring the actual generator power of a unit;
and generating a variable load feedforward common instruction according to a preset target generator power and the actual generator power of the unit so as to correct the power deviation between the actual generator power of the unit and the target generator power.
9. A thermal power plant comprising a coordinated control system of a thermal power plant according to any one of claims 1 to 4.
10. A computer-readable storage medium storing computer-executable instructions for performing the coordinated control method of a thermal power plant according to any one of claims 5 to 8.
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