CN110865536A - Primary frequency modulation optimization control method, system and medium for thermal power generating unit - Google Patents
Primary frequency modulation optimization control method, system and medium for thermal power generating unit Download PDFInfo
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Abstract
The invention discloses a primary frequency modulation optimal control method, a primary frequency modulation optimal control system and a primary frequency modulation optimal control medium for a thermal power generating unit, wherein the method comprises the steps of generating an additional pressure set value according to primary frequency modulation actions and input conditions; and superposing the additional pressure set value to a main steam pressure set value to obtain a new main steam pressure set value, and outputting the new main steam pressure set value as a main steam pressure set value parameter of a primary frequency modulation control system of the thermal power generating unit. The invention properly increases the main steam pressure on the basis of normal sliding pressure or constant pressure operation by flexibly designing the additional set value of the main steam pressure, quickly acts on fuel, water supply and air quantity control through frequency difference to achieve the purposes of heat storage and quick heat load release, maintains the stability of the main steam pressure while meeting the quick response of primary frequency modulation, and can effectively improve the primary frequency modulation capability of the thermal power generating unit.
Description
Technical Field
The invention relates to a control and measurement engineering technology of a thermal power generating unit, in particular to a method, a system and a medium for optimally controlling primary frequency modulation of a thermal power generating unit.
Background
China is a coal-electricity big country, and although the installed capacity rises year by year due to rapid development of new energy power generation such as wind power and photovoltaic, the proportion of coal electricity in the total installed capacity still exceeds 50% due to the natural endowment of resources in China and incomparable stability of coal-fired power generation. An electric power structure which mainly comprises coal power and is formed by a plurality of distributed new energy power generation is a trend of electric power development for a period of time in the future. With the continuous increase of the installed capacity of the new energy generating set and the further improvement of the consumption proportion of clean energy, the peak regulation and frequency modulation properties of the thermal power generating set are more and more obvious. The method is limited to the intermittence and instability of wind and light resources, and the grid-connected operation of wind power generation and solar power generation not only increases the operation peak-valley difference of the thermal power generating unit, but also puts higher requirements on the peak regulation performance and the frequency regulation performance of the thermal power generating unit. The method is characterized by comprising the following two aspects: 1) the peak regulation depth is further enlarged, the requirement for rapidity of load response is further increased, and 2) the frequency modulation frequency is increased, and the frequency difference change is more diversified. AGC and primary frequency modulation assessment become important factors which are not negligible in operation of many thermal power plants.
The current primary frequency modulation control generally adopts a frequency difference signal to be converted into a load instruction through function change, and is directly superposed on a gate adjusting instruction by being assisted with a feed-forward quantity so as to meet the requirement of the frequency modulation quantity and the quick response requirement of the primary frequency modulation. The strategy lays a basic framework of primary frequency modulation control, and can meet the requirement of primary frequency modulation under the condition of large frequency difference. However, in the actual operation process, the action condition of small frequency difference is relatively large. In order to enable the primary frequency modulation action to reach the standard under the working condition of small frequency difference, a part of power plants modify the corresponding relation between the frequency difference and the load requirement or strengthen the regulation effect of a main control PID (proportion integration differentiation) of the steam turbine, improve the response characteristic of the primary frequency modulation to a certain extent, increase the power oscillation risk and be particularly obvious when the flow characteristic of a valve is poor. The corresponding relation between the frequency difference and the load is modified by the power plant through phase change in modes of modifying feedforward and the like, which are not allowed by scheduling.
Therefore, how to improve the response characteristic of the primary frequency modulation under the working condition of small frequency difference not only meets the requirement of frequency modulation action amount and the requirement of frequency modulation action time, but also avoids the hidden trouble of causing power oscillation, and does not violate the relevant management regulations, which becomes a key technical problem to be solved urgently.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems in the prior art, the invention provides a primary frequency modulation optimization control method, a primary frequency modulation optimization control system and a primary frequency modulation optimization control medium for a thermal power generating unit.
In order to solve the technical problems, the invention adopts the technical scheme that:
a thermal power generating unit primary frequency modulation optimization control method comprises the following implementation steps:
generating an additional pressure set value according to the primary frequency modulation action and the input condition; superposing the additional pressure set value to a main steam pressure set value to obtain a new main steam pressure set value, and outputting the new main steam pressure set value as a main steam pressure set value parameter of a primary frequency modulation control system of the thermal power generating unit;
and generating theoretical demand quantities of fuel, water supply and total air volume of the primary frequency modulation control system according to the frequency difference signal, and respectively superposing the theoretical demand quantities into setting values of boiler main control, water supply main control and total air volume control. .
Optionally, the detailed step of generating the additional pressure set value according to the primary frequency modulation action and the input condition includes: setting a plurality of candidate values; and selecting a candidate value according to the primary frequency modulation action and the input condition and generating an additional pressure set value.
Optionally, the set plurality of candidate values includes three candidate values a1，A2And A3Selecting the candidate value according to the primary frequency modulation action and the input condition specifically includes: setting a condition 1 and a condition 2 according to the primary frequency modulation action and the input condition, wherein the condition 1 is as follows: performing primary frequency modulation action, wherein the frequency modulation requires load reduction and the signal is disconnected after 2min of delay; the condition 2 is as follows: primary frequency modulation is input; and selects the candidate value a when condition 2 is satisfied and condition 1 is satisfied1Selecting a candidate value A when condition 2 is satisfied and condition 1 is not satisfied2Selecting candidate value A when condition 2 is not satisfied3。
Optionally, the three candidate values a1，A2And A3Respectively 0, 0.3-0.5 MPa and 0.
Optionally, the generating the additional pressure setting value refers to gradually switching from the original additional pressure setting value to a newly selected candidate value according to a set switching change rate when the selected candidate value changes from the original additional pressure setting value.
Optionally, when the original set value of the additional pressure is gradually switched to the newly selected candidate value according to the set switching change rate, if the condition 2 is satisfied and the condition 1 changes from being satisfied to being unsatisfied, the original set value of the additional pressure is gradually switched to the newly selected candidate value according to the first switching change rate; if the condition 2 is met and the condition 1 is changed from not met to met, gradually switching from the original set value of the additional pressure to a newly selected candidate value according to a second switching change rate; if the condition 2 is changed from satisfaction to non-satisfaction, gradually switching from the original set value of the additional pressure to a newly selected candidate value according to a third switching change rate; if the condition 2 is changed from unsatisfied to satisfied, the original additional pressure set value is gradually switched to the newly selected candidate value according to a fourth switching change rate.
Optionally, the first switching change rate is 0.05MPa/s, the second switching change rate is 5MPa/s, the third switching change rate is 0.05MPa/s, and the fourth switching change rate is 0.1 MPa/s.
Optionally, the detailed step of generating theoretical demands of fuel, feed water and total air volume of the primary frequency modulation control system according to the frequency difference signal comprises:
s1) subtracting 50Hz from the current frequency measurement value of the unit to obtain a frequency difference signal;
s2) mapping the frequency difference signal through a preset function F (x) to obtain a theoretical demand quantity of frequency-modulated fuel, and then superposing the theoretical demand quantity of the frequency-modulated fuel to a main control set value of the boiler to be used as a set value parameter of a primary frequency-modulated control system of the thermal power generating unit; mapping the frequency difference signal by a preset function G (x) to obtain a theoretical demand of frequency-modulated water supply, and then superposing the theoretical demand to a set value of a water supply main control to be used as a set value parameter of a primary frequency-modulated control system of the thermal power generating unit; and mapping the frequency difference signal by a preset function H (x) to obtain theoretical demand of frequency modulation total air volume, and then superposing the theoretical demand into a set value of the total air volume to be used as a set value parameter of a primary frequency modulation control system of the thermal power generating unit.
Optionally, the function f (x) corresponds to frequency differences of-0.1, -0.05, -0.033, 0.05, 0.1, respectively, (a × Pe)/(3000 × σ), 0; the function g (x) has values of (b × Pe)/(3000 × σ), 0 corresponding to the frequency difference-0.1, -0.05, -0.033, 0.05, 0.1, respectively; the function H (x) has values of (c & ltx & gt Pe)/(3000 & ltx & gt), 0 and 0 corresponding to the frequency difference-0.1, -0.05, -0.033, 0.033 and 0.1 respectively; where Pe is the rated load of the thermal power generating unit, σ is the unequal ratio, and a, b, and c are coefficients set according to the unit characteristics.
In addition, the invention also provides a thermal power generating unit primary frequency modulation optimization control system, which comprises a computer device, wherein the computer device is programmed or configured to execute the steps of the thermal power generating unit primary frequency modulation optimization control method, or a computer program which is programmed or configured to execute the thermal power generating unit primary frequency modulation optimization control method is stored in a memory of the computer device.
In addition, the invention also provides a computer readable storage medium, and the computer readable storage medium stores a computer program which is programmed or configured to execute the primary frequency modulation optimization control method of the thermal power generating unit.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the heat storage capacity of the thermal power generating unit is improved by adding a proper additional pressure set value on the main steam pressure set value in normal operation. When the load required by the primary frequency modulation action is increased, the primary frequency modulation requirement can be quickly responded by releasing the stored heat. When the load required by the primary frequency modulation action is reduced, the invention is provided with a loop for reducing the set value of the main steam pressure in a step mode, so that the purpose of rapidly reducing the load can be achieved without being influenced by the main steam pressure when the opening degree of the steam turbine regulating valve is reduced.
2. The invention generates the additional pressure set value according to the primary frequency modulation action and the input condition, so that a flexible selection mechanism for generating the additional pressure set value can be designed according to the requirement, different additional pressure set values are selected according to different operation conditions, the additional pressure set value has a heat storage function when the primary frequency modulation is input, and the additional pressure set value operates according to a sliding pressure curve or a constant pressure mode when the primary frequency modulation is quitted.
3. According to the invention, the switching rate of the additional pressure set value is designed according to different working conditions, so that the main steam pressure set value is slowly changed without causing step disturbance when the primary frequency modulation is normally put in and taken out, and when the load reduction is required by the primary frequency modulation, the main steam pressure is changed in a step manner, the heat load is rapidly reduced, and the load reduction action is smoothly completed. The stability and the practicality of frequency modulation control are promoted.
4. According to the invention, the theoretical demand of frequency-modulated water supply, the demand of frequency-modulated fuel and the demand of frequency-modulated total air volume are directly obtained according to the frequency difference signal, and compared with the technical scheme that a load instruction is generated through the frequency difference and then the water supply, the fuel and the total air volume are adjusted through the load instruction, the time is saved, the frequency-modulated compensation precision is improved, the dependence on the adjustment quality of a coordinated control system is reduced, and the frequency-modulated response characteristic is integrally improved.
5. According to the heat storage characteristics of the thermal power generating unit, different frequency modulation water supply theoretical demand, frequency modulation fuel demand and frequency modulation total air volume demand are adopted when the load is increased according to the frequency modulation requirement and the load is decreased according to the frequency modulation requirement, and when the load is increased according to the frequency modulation requirement, the heat storage released by frequency modulation is supplemented through the rapid action of water supply, fuel and total air volume; when the load reduction is required by frequency modulation, the feed-forward control of water supply, fuel and total air volume required by the frequency modulation action is set to be 0, and the rapid reduction of the heat load is realized through the step reduction of the main steam pressure so as to prevent the main steam pressure from being pulled down to influence the normal operation of the unit.
Drawings
FIG. 1 is a schematic diagram of a basic flow of a method according to an embodiment of the present invention.
FIG. 2 is a schematic flow chart illustrating the details of generating additional pressure set points according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the implementation steps of the primary frequency modulation optimization control method for the thermal power generating unit in this embodiment include:
generating an additional pressure set value according to the primary frequency modulation action and the input condition; superposing the additional pressure set value to the main steam pressure set value to obtain a new main steam pressure set value, and outputting the new main steam pressure set value as a main steam pressure set value parameter of a primary frequency modulation control system of the thermal power generating unit;
and generating theoretical demand quantities of fuel, water supply and total air volume of the primary frequency modulation control system according to the frequency difference signal, and respectively superposing the theoretical demand quantities into setting values of boiler main control, water supply main control and total air volume control.
In this embodiment, the detailed steps of generating the set additional pressure value according to the primary frequency modulation operation and the input condition include: setting a plurality of candidate values; and selecting a candidate value according to the primary frequency modulation action and the input condition and generating an additional pressure set value.
In this embodiment, the multiple candidate values include three candidate values a1，A2And A3Selecting a candidate value according to the primary frequency modulation action and the input condition specifically means that: setting conditions 1 and 2 according to the primary frequency modulation action and the input condition, wherein the condition 1 is as follows: primary frequency modulation action and frequency modulation requirement load reduction and signalThe signal is disconnected after 2 min; the condition 2 is: primary frequency modulation is input; and selects the candidate value a when condition 2 is satisfied and condition 1 is satisfied1Selecting a candidate value A when condition 2 is satisfied and condition 1 is not satisfied2Selecting candidate value A when condition 2 is not satisfied3. In this example, A1，A2And A3Respectively 0, 0.3-0.5 MPa and 0.
In this embodiment, the generation of the additional pressure setting value means that the selected candidate value is gradually switched from the original additional pressure setting value to the newly selected candidate value at the set switching change rate when the selected candidate value is changed from the original additional pressure setting value. In the embodiment, the flexible and reliable switching change rate is designed when the additional pressure set value is selected, and the additional pressure set value is switched from the current value to the target value at a slower rate when the primary frequency modulation is input and quit, so that the disturbance of the main steam pressure control is reduced. When the primary frequency modulation requires load reduction, the additional pressure set value is instantly switched to 0, and is matched with the action of a steam turbine regulating valve, and after the primary frequency modulation load reduction action is finished, the additional pressure set value is switched to a target value at a slower speed, so that the purpose of heat storage is achieved.
In this embodiment, when the original set value of the additional pressure is gradually switched to the newly selected candidate value according to the set switching change rate, if the condition 2 is satisfied and the condition 1 changes from being satisfied to being unsatisfied, the original set value of the additional pressure is gradually switched to the newly selected candidate value according to the first switching change rate; if the condition 2 is met and the condition 1 is changed from not met to met, gradually switching from the original set value of the additional pressure to a newly selected candidate value according to a second switching change rate; if the condition 2 is changed from satisfaction to non-satisfaction, gradually switching from the original set value of the additional pressure to a newly selected candidate value according to a third switching change rate; if the condition 2 is changed from unsatisfied to satisfied, the original additional pressure set value is gradually switched to the newly selected candidate value according to a fourth switching change rate.
In this embodiment, the first switching rate is 0.05MPa/s, the second switching rate is 5MPa/s, the third switching rate is 0.05MPa/s, and the fourth switching rate is 0.1 MPa/s.
As shown in fig. 2, in this embodiment, the module corresponding to condition 1 is the selection module 1, the module corresponding to condition 2 is the selection module 2, and the judgment order of the first condition 1 and the second condition 2 is adopted, or other judgment methods may be adopted as needed as long as the foregoing conditions can be achieved (the candidate value a is selected when condition 2 is satisfied and condition 1 is satisfied)1Selecting a candidate value A when condition 2 is satisfied and condition 1 is not satisfied2Selecting candidate value A when condition 2 is not satisfied3) All can be used.
As shown in fig. 2, the specific steps of adopting the judgment sequence of the first condition 1 and the second condition 2 include: when the condition 1 is satisfied, selecting A1As the output value of the selection module 1, otherwise, selecting A2As the output value of the selection module 1; when the condition 2 is met, the output value of the selection module 1 is selected as the output value of the selection module 2, otherwise, A is selected3As the output value of the selection module 2, the output value of the selection module 2 is the additional pressure set value. It should be noted that, when the selected candidate value changes from the original additional pressure setting value according to the set change rate of switching, the step of gradually switching from the original additional pressure setting value to the newly selected candidate value may be directly implemented in the selection module 1 and the selection module 2, so that the adjustment of the change rate of the additional pressure setting value while selecting may be implemented, for example, in this embodiment: when the judgment condition of the selection module 1 is changed from YES to NO, the output value of the selection module 1 is changed from A1Change to A at a rate of 0.05MPa/s2When the judgment condition of the selection module 1 is changed from NO to YES, the output value of the selection module 1 is changed from A2Change A at a rate of 5MPa/s1(ii) a When the judgment condition of the selection module 2 is changed from YES to NO, the output value of the selection module 1 is changed from the output value of the selection module 2 to A at the rate of 0.05MPa/s3When the judgment condition of the selection module 1 is changed from NO to YES, the output value of the selection module 1 is changed from A3The output value to the selection module 1 is changed at a rate of 0.1 MPa/s. It is of course also possible to add a switching rate of change adjustment module separately downstream of this, so that the additional pressure is adjusted after the final candidate value has been selectedRate of change of force set point value.
The detailed steps of generating the theoretical demand of the fuel, the feed water and the total air volume of the primary frequency modulation control system according to the frequency difference signal in the embodiment comprise:
s1) subtracting 50Hz from the current frequency measurement value of the unit to obtain a frequency difference signal;
s2) mapping the frequency difference signal through a preset function F (x) to obtain a theoretical demand quantity of frequency-modulated fuel, and then superposing the theoretical demand quantity of the frequency-modulated fuel to a main control set value of the boiler to be used as a set value parameter of a primary frequency-modulated control system of the thermal power generating unit; mapping the frequency difference signal by a preset function G (x) to obtain a theoretical demand of frequency-modulated water supply, and then superposing the theoretical demand to a set value of a water supply main control to be used as a set value parameter of a primary frequency-modulated control system of the thermal power generating unit; and mapping the frequency difference signal by a preset function H (x) to obtain theoretical demand of frequency modulation total air volume, and then superposing the theoretical demand into a set value of the total air volume to be used as a set value parameter of a primary frequency modulation control system of the thermal power generating unit. In the embodiment, the fuel, the water supply and the total air volume control signal are directly generated through the frequency difference signal, and the change of the main steam pressure is quicker through the direct and quick adjustment of the heat load, so that the main steam pressure is more tacitly matched with the action of the steam turbine regulating valve. Compared with a control mode of only passing a load instruction, the technical scheme adopted by the invention saves time and enables the response to be faster.
In this embodiment, the values of the function f (x) corresponding to the frequency differences-0.1, -0.05, -0.033, 0.05, 0.1 are (a × Pe)/(3000 × σ), 0, respectively; the function g (x) has values of (b × Pe)/(3000 × σ), 0 corresponding to the frequency difference-0.1, -0.05, -0.033, 0.05, 0.1, respectively; the function h (x) has values of (c × Pe)/(3000 × σ), 0 corresponding to the frequency difference-0.1, -0.05, -0.033, 0.05, 0.1, respectively; where Pe is the rated load of the thermal power generating unit, σ is the unequal ratio, and a, b, and c are coefficients set according to the unit characteristics. The mapping relationships of the functions F (x), G (x) and H (x) are shown in Table 1.
Table 1: the frequency difference corresponds to fuel, feedwater, and total air volume demand values.
| Frequency difference (Hz) | -0.1 | -0.05 | -0.033 | 0.033 | 0.05 | 0.1 |
| F (x) takes on the value | (a*Pe)/(3000*σ) | (a*Pe)/(3000*σ) | 0 | 0 | 0 | 0 |
| G (x) takes on the value | (b*Pe)/(3000*σ) | (b*Pe)/(3000*σ) | 0 | 0 | 0 | 0 |
| H (x) takes on the value | (c*Pe)/(3000*σ) | (c*Pe)/(3000*σ) | 0 | 0 | 0 | 0 |
In the above table, Pe is the rated load of the thermal power generating unit, σ is the unequal ratio, and a, b, and c are coefficients set according to the unit characteristics. In this embodiment, by designing the mapping relationship among the functions f (x), g (x), and h (x), the corresponding relationships among different frequency difference signal segments, fuel, water supply, and total air volume control signals are different, so that the dual purposes of sensitive thermal load response under small frequency difference disturbance and stable thermal load control under large frequency difference disturbance are achieved. In this embodiment, Pe takes a value of 620MW, σ takes a value of 5%, and a, b, and c take values of 4, 30, and 38, respectively.
In summary, in the primary frequency modulation optimization control method for the thermal power generating unit, the main steam pressure is properly increased on the basis of normal sliding pressure or constant pressure operation by flexibly designing the main steam pressure additional set value, the purposes of heat storage and rapid heat load release are achieved by rapidly acting the frequency difference on fuel, water supply and air volume control, the primary frequency modulation rapid response is met, the stability of the main steam pressure is maintained, and the primary frequency modulation capability of the thermal power generating unit can be effectively improved. According to the embodiment, the response characteristic of primary frequency modulation is improved by a method of storing heat and quickly reducing heat load, the stability of the main steam pressure is maintained while the primary frequency modulation performance is met, and the qualification rate of primary frequency modulation action under small frequency difference disturbance can be effectively improved.
In addition, the embodiment also provides a thermal power generating unit primary frequency modulation optimization control system, which includes a computer device programmed or configured to execute the steps of the thermal power generating unit primary frequency modulation optimization control method, or a computer program programmed or configured to execute the thermal power generating unit primary frequency modulation optimization control method is stored in a memory of the computer device.
In addition, the present embodiment also provides a computer readable storage medium, which stores thereon a computer program programmed or configured to execute the aforementioned primary frequency modulation optimization control method for a thermal power generating unit.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. A primary frequency modulation optimization control method for a thermal power generating unit is characterized by comprising the following implementation steps:
generating an additional pressure set value according to the primary frequency modulation action and the input condition, superposing the additional pressure set value to a main steam pressure set value to obtain a new main steam pressure set value, and outputting the new main steam pressure set value to be used as a main steam pressure set value parameter of a primary frequency modulation control system of the thermal power generating unit;
and generating theoretical demand quantities of fuel, water supply and total air volume of the primary frequency modulation control system according to the frequency difference signal, and respectively superposing the theoretical demand quantities into setting values of boiler main control, water supply main control and total air volume control.
2. The thermal power generating unit primary frequency modulation optimization control method according to claim 1, wherein the detailed step of generating the additional pressure set value according to the primary frequency modulation action and the input condition comprises the following steps: setting a plurality of candidate values; and selecting a candidate value according to the primary frequency modulation action and the input condition and generating an additional pressure set value.
3. The thermal power generating unit primary frequency modulation optimization control method according to claim 2, wherein the set candidate values comprise three candidate values A1，A2And A3Selecting the candidate value according to the primary frequency modulation action and the input condition specifically includes: setting a condition 1 and a condition 2 according to the primary frequency modulation action and the input condition, wherein the condition 1 is as follows: performing primary frequency modulation action, wherein the frequency modulation requires load reduction and the signal is disconnected after 2min of delay; the condition 2 is as follows: primary frequency modulation is input; and selects the candidate value a when condition 2 is satisfied and condition 1 is satisfied1In the presence ofSelecting candidate value A when condition 2 is not satisfied and condition 1 is not satisfied2Selecting candidate value A when condition 2 is not satisfied3。
4. The thermal power generating unit primary frequency modulation optimization control method according to claim 3, wherein the three candidate values A1，A2And A3Respectively 0, 0.3-0.5 MPa and 0.
5. The thermal power generating unit primary frequency modulation optimization control method as claimed in claim 4, wherein the generating of the additional pressure setting value is to gradually switch from an original additional pressure setting value to a newly selected candidate value according to a set switching change rate when the selected candidate value changes from the original additional pressure setting value.
6. The thermal power generating unit primary frequency modulation optimization control method according to claim 5, wherein when the original additional pressure setting value is gradually switched to the newly selected candidate value according to the set switching change rate, if the condition 2 is satisfied and the condition 1 changes from being satisfied to being unsatisfied, the original additional pressure setting value is gradually switched to the newly selected candidate value according to the first switching change rate; if the condition 2 is met and the condition 1 is changed from not met to met, gradually switching from the original set value of the additional pressure to a newly selected candidate value according to a second switching change rate; if the condition 2 is changed from satisfaction to non-satisfaction, gradually switching from the original set value of the additional pressure to a newly selected candidate value according to a third switching change rate; if the condition 2 is changed from unsatisfied to satisfied, the original additional pressure set value is gradually switched to the newly selected candidate value according to a fourth switching change rate.
7. The thermal power generating unit primary frequency modulation optimization control method according to claim 1, wherein the detailed step of generating theoretical demands of fuel, water supply and total air volume of the primary frequency modulation control system according to the frequency difference signal comprises:
s1) subtracting 50Hz from the current frequency measurement value of the unit to obtain a frequency difference signal;
s2) mapping the frequency difference signal through a preset function F (x) to obtain a theoretical demand quantity of frequency-modulated fuel, and then superposing the theoretical demand quantity of the frequency-modulated fuel to a main control set value of the boiler to be used as a set value parameter of a primary frequency-modulated control system of the thermal power generating unit; mapping the frequency difference signal by a preset function G (x) to obtain a theoretical demand of frequency-modulated water supply, and then superposing the theoretical demand to a set value of a water supply main control to be used as a set value parameter of a primary frequency-modulated control system of the thermal power generating unit; and mapping the frequency difference signal by a preset function H (x) to obtain theoretical demand of frequency modulation total air volume, and then superposing the theoretical demand into a set value of the total air volume to be used as a set value parameter of a primary frequency modulation control system of the thermal power generating unit.
8. The thermal power generating unit primary frequency modulation optimization control method according to claim 7, wherein the function F (x) corresponds to frequency differences of-0.1, -0.05, -0.033, 0.05, 0.1, respectively, (a Pe)/(3000 σ), 0; the function g (x) has values of (b × Pe)/(3000 × σ), 0 corresponding to the frequency difference-0.1, -0.05, -0.033, 0.05, 0.1, respectively; the function H (x) has values of (c & ltx & gt Pe)/(3000 & ltx & gt), 0 and 0 corresponding to the frequency difference-0.1, -0.05, -0.033, 0.033 and 0.1 respectively; where Pe is the rated load of the thermal power generating unit, σ is the unequal ratio, and a, b, and c are coefficients set according to the unit characteristics.
9. A primary frequency modulation optimization control system of a thermal power generating unit, comprising a computer device, wherein the computer device is programmed or configured to execute the steps of the primary frequency modulation optimization control method of the thermal power generating unit according to any one of claims 1 to 8, or a memory of the computer device has stored thereon a computer program programmed or configured to execute the primary frequency modulation optimization control method of the thermal power generating unit according to any one of claims 1 to 8.
10. A computer-readable storage medium, wherein the computer-readable storage medium stores thereon a computer program programmed or configured to execute the thermal power generating unit primary frequency modulation optimization control method according to any one of claims 1 to 8.
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