A method and device for primary frequency modulation of a thermal power unit

Abstract

The application provides a primary frequency modulation method and device for a thermal power generating unit, and relates to the field of automatic control of power systems, and comprises the following steps: determining a frequency modulation output value according to a preset frequency modulation target value, a frequency modulation recovery rate, a frequency modulation response rate, and a frequency deviation between an actual frequency and a rated frequency of the thermal power generating unit; the frequency modulation output value comprises a power adjustment instruction value and a valve position adjustment instruction value; determining an actual power deviation according to an initial power deviation and the power adjustment instruction value; determining a valve position final instruction value according to an initial valve position instruction value and the valve position adjustment instruction value, and inputting the valve position final instruction value into a valve position control system to realize the primary frequency modulation of the thermal power generating unit. The application can improve the response capability and stability of the thermal power generating unit in response to continuous small frequency deviation network frequency fluctuations, and avoid the problem of low-frequency oscillation of the thermal power generating unit caused by the primary frequency modulation action.

Description

Technical Field

[0001] The present application relates to the field of power system automation control, and specifically to a primary frequency regulation method and device for a thermal power unit. Background Art

[0002] With the rapid development of new energy and ultra-high voltage technologies, frequency fluctuations in power grid operations have become increasingly prominent. As a critical component supporting grid frequency stability, the primary frequency regulation performance of thermal power units reflects their ability to regulate grid frequency. Currently, primary frequency regulation of thermal power units is accomplished by converting frequency differences into incremental openings of the turbine generator's steam control valves. This primary frequency regulation is rapid. Once the frequency difference crosses the deadband, it is immediately converted into load commands and integrated valve position commands through function calculation, thereby changing the thermal power unit's output. Once the frequency difference returns to the deadband, the incremental power output of the thermal power unit is immediately reset to zero. In this situation, when grid damping is low, small frequency difference disturbances are frequent, which can easily cause low-frequency oscillations in the grid, threatening grid security.

[0003] Specifically, when the grid frequency exceeds the dead zone, a primary frequency modulation action occurs immediately; when the grid frequency returns to within the dead zone, the primary frequency modulation action also resumes accordingly. Therefore, during the actual operation of thermal power units, the grid frequency often fluctuates frequently near the dead zone, triggering repeated primary frequency modulation actions, causing constant fluctuations in the power of the thermal power units, leading to low-frequency oscillations in the thermal power units, and threatening the safe operation of the power grid. Summary of the Invention

[0004] In response to the problems in the prior art, the present application provides a primary frequency regulation method and device for a thermal power unit, which can improve the response capability and stability of the thermal power unit to continuous small frequency difference grid frequency fluctuations, and avoid the low-frequency oscillation problem of the thermal power unit caused by the primary frequency regulation action.

[0005] To solve the above technical problems, this application provides the following technical solutions:

[0006] In a first aspect, the present application provides a primary frequency regulation method for a thermal power unit, comprising:

[0007] According to the preset frequency modulation target value X T , frequency modulation recovery rate V1, frequency modulation response rate V2 and the frequency deviation ΔF between the actual frequency and the rated frequency of the thermal power unit determine the frequency modulation output value Y T ; The frequency modulation output value Y T Including power adjustment command value P F And valve position adjustment command value H F ;

[0008] According to the initial power deviation ΔP0 and the power adjustment command value P F Determine the actual power deviation ΔP;

[0009] According to the valve position initial command value H0, the valve position adjustment command value H F The final valve position command value H is determined, and the final valve position command value H is input into the valve position control system DEH to achieve primary frequency regulation of the thermal power unit.

[0010] Furthermore, the frequency modulation target value X T Including: power target value; the frequency modulation output value Y T Including: the power adjustment command value P F According to the preset frequency modulation target value X T , frequency modulation recovery rate V1, frequency modulation response rate V2 and the frequency deviation ΔF between the actual frequency and the rated frequency of the thermal power unit determine the frequency modulation output value Y T ,include:

[0011] Determine the power target value X T a first difference between the power output value and the initial power output value;

[0012] Determine whether the frequency deviation ΔF is greater than zero, and determine the power adjustment command value P according to the first judgment result, the frequency modulation recovery rate V1, the frequency modulation response rate V2 and the first difference. F ;

[0013] Determine the power adjustment command value P F Whether the power target value is reached, if not, the power initial output value is replaced by the power adjustment instruction value, and the above steps are iterated until the power adjustment instruction value P F The power target value is achieved.

[0014] Furthermore, the first judgment result is that the frequency deviation ΔF is less than zero; the power adjustment command value P is determined based on the first judgment result, the frequency modulation recovery rate V1, the frequency modulation response rate V2 and the first difference. F ,include:

[0015] The larger of the negative value of the frequency modulation response rate V1 and the first difference is used as the first output value, the smaller of the frequency modulation response rate V2 and the first output value is used as the second output value, and the sum of the second output value and the current actual power is used as the power adjustment instruction value P F .

[0016] Furthermore, the first judgment result is that the frequency deviation ΔF is greater than zero; the power adjustment command value P is determined based on the first judgment result, the frequency modulation recovery rate V1, the frequency modulation response rate V2 and the first difference. F ,include:

[0017] the greater between the negative value of the frequency modulation response rate V2 and the first difference value as a first output value, the smaller between the frequency modulation recovery rate V1 and the first output value as a second output value, and the sum of the second output value and the current actual power as the power adjustment instruction value P F .

[0018] Further, the frequency modulation target value X T comprises a valve position target value; the frequency modulation output value Y T comprises the valve position adjustment instruction value H F ; the frequency modulation output value Y T is determined according to a preset frequency modulation target value X T , a frequency modulation recovery rate V1, a frequency modulation response rate V2, and a frequency deviation ΔF between an actual frequency and a rated frequency of the thermal power generating unit

[0019] a second difference value between the valve position target value X T and a valve position initial output value is determined;

[0020] whether the frequency deviation ΔF is greater than zero is determined, and the valve position adjustment instruction value H F is determined according to a second determination result, the frequency modulation recovery rate V1, the frequency modulation response rate V2, and the second difference value;

[0021] whether the valve position adjustment instruction value H F reaches the valve position target value is determined, and if not, the valve position adjustment instruction value H F is used to replace the valve position initial output value, and the above steps are iteratively performed until the valve position adjustment instruction value H F reaches the valve position target value.

[0022] Further, the second determination result is that the frequency deviation ΔF is less than zero; the valve position adjustment instruction value H F is determined according to a second determination result, the frequency modulation recovery rate V1, the frequency modulation response rate V2, and the second difference value, comprising:

[0023] the greater between the negative value of the frequency modulation recovery rate V1 and the second difference value as a first output value, the smaller between the frequency modulation response rate V2 and the first output value as a second output value, and the sum of the second output value and the current actual valve position as the valve position adjustment instruction value H F .

[0024] Further, the second determination result is that the frequency deviation ΔF is greater than zero; the valve position adjustment instruction value H F, comprising:

[0025] The greater one between the negative value of the frequency modulation response rate V2 and the second difference value is taken as a first output value, the smaller one between the frequency modulation recovery rate V1 and the first output value is taken as a second output value, and the sum of the second output value and the current actual valve position is taken as the valve position adjustment instruction value H F .

[0026] Further, the actual power deviation ΔP is determined according to the initial power deviation ΔP0 and the power adjustment instruction value P F .

[0027] The initial power deviation is added to the power adjustment instruction value to obtain the actual power deviation.

[0028] Further, the valve position final instruction value H is determined according to the valve position initial instruction value H0, the valve position adjustment instruction value H F .

[0029] The valve position initial instruction value is added to the valve position adjustment instruction value to obtain the valve position final instruction value.

[0030] In a second aspect, the application provides a primary frequency modulation device for a thermal power generating unit, comprising:

[0031] A frequency modulation output determination unit is configured to determine a frequency modulation output value Y T according to a preset frequency modulation target value X T , a frequency modulation recovery rate V1, a frequency modulation response rate V2, and a frequency deviation ΔF between an actual frequency and a rated frequency of the thermal power generating unit. T The frequency modulation output value Y F includes a power adjustment instruction value P F and a valve position adjustment instruction value H F .

[0032] A power deviation determination unit is configured to determine an actual power deviation ΔP according to an initial power deviation ΔP0 and the power adjustment instruction value P F .

[0033] A primary frequency modulation unit is configured to determine a valve position final instruction value H according to a valve position initial instruction value H0 and the valve position adjustment instruction value H F , and input the valve position final instruction value H to a valve position control system DEH to realize primary frequency modulation of the thermal power generating unit.

[0034] Further, the frequency modulation target value X T includes a power target value; and the frequency modulation output value Y T includes the frequency modulation output determination unit, which includes:

[0035] a first difference determination module configured to determine a first difference between the power target value X T and a power initial output value;

[0036] a power instruction adjustment module configured to determine whether the frequency deviation ΔF is greater than zero, and determine the power adjustment instruction value P F according to a first determination result, the frequency recovery rate V1, the frequency response rate V2 and the first difference;

[0037] a power target determination module configured to determine whether the power adjustment instruction value P F reaches the power target value, and replace the power initial output value with the power adjustment instruction value if the power adjustment instruction value P F does not reach the power target value, and iteratively perform the above steps until the power adjustment instruction value P

[0038] Further, the first determination result is that the frequency deviation ΔF is less than zero; and the power instruction adjustment module is specifically configured to:

[0039] determine a larger one between a negative value of the frequency recovery rate V1 and the first difference as a first output value, determine a smaller one between the frequency response rate V2 and the first output value as a second output value, and determine a sum of the second output value and a current actual power as the power adjustment instruction value P F .

[0040] Further, the first determination result is that the frequency deviation ΔF is greater than zero; and the power instruction adjustment module is specifically configured to:

[0041] determine a larger one between a negative value of the frequency response rate V2 and the first difference as a first output value, determine a smaller one between the frequency recovery rate V1 and the first output value as a second output value, and determine a sum of the second output value and a current actual power as the power adjustment instruction value P F .

[0042] Further, the frequency target value X T includes a valve position target value; and the frequency output value Y T includes the valve position adjustment instruction value H F ; and the frequency output determination unit includes:

[0043] a second difference determination module configured to determine a second difference between the valve position target value X T and a valve position initial output value;

[0044] The valve position instruction adjustment module is configured to determine whether the frequency deviation ΔF is greater than zero, and determine the valve position adjustment instruction value H according to a second determination result, the frequency recovery rate V1, the frequency response rate V2, and the second difference value F .

[0045] The valve position target determination module is configured to determine whether the valve position adjustment instruction value H reaches the valve position target value F , and if not, replace the valve position initial output value with the valve position adjustment instruction value H F , and iteratively perform the above steps until the valve position adjustment instruction value H reaches the valve position target value. F

[0046] Further, the second determination result is that the frequency deviation ΔF is less than zero; and the frequency output determination unit is specifically configured to:

[0047] determine the greater one between the negative value of the frequency recovery rate V1 and the second difference value as a first output value, determine the smaller one between the frequency response rate V2 and the first output value as a second output value, and determine the sum of the second output value and the current actual valve position as the valve position adjustment instruction value H F .

[0048] Further, the second determination result is that the frequency deviation ΔF is greater than zero; and the frequency output determination unit is specifically configured to:

[0049] determine the greater one between the negative value of the frequency response rate V2 and the second difference value as a first output value, determine the smaller one between the frequency recovery rate V1 and the first output value as a second output value, and determine the sum of the second output value and the current actual valve position as the valve position adjustment instruction value H F .

[0050] Further, the power deviation determination unit is specifically configured to:

[0051] add the initial power deviation and the power adjustment instruction value to obtain the actual power deviation.

[0052] Further, the primary frequency modulation unit is specifically configured to:

[0053] add the valve position initial instruction value and the valve position adjustment instruction value to obtain the valve position final instruction value.

[0054] In a third aspect, the present application provides an electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the primary frequency modulation method of the thermal power generating unit when executing the program.

[0055] ​In a fourth aspect, the present application provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the steps of the primary frequency modulation method of the thermal power generating unit.

[0056] In view of the problems in the prior art, the primary frequency modulation method and device of the thermal power generating unit provided by the present application can make the thermal power generating unit rapidly step action according to the load demand in the initial stage of the primary frequency modulation response, ensure the rapidity of the primary frequency modulation, and when the primary frequency modulation is in the callback action, the callback is performed at a set adjustment rate, the rate of the power callback action of the steam distribution valve and the unit is reduced, resonance between the power of the thermal power generating unit and the grid frequency is avoided, the grid frequency is normally damped and asynchronously adjusted on the power supply side, and the grid frequency oscillation caused by the primary frequency modulation action is suppressed, the response capability and the stability of the thermal power generating unit to the continuous small frequency difference grid frequency fluctuation are improved, and the problem of the low frequency oscillation of the thermal power generating unit caused by the primary frequency modulation action is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0057] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0058] Figure 1 The flow chart of the primary frequency modulation method of the thermal power generating unit in the embodiment of the present application;

[0059] Figure 2 One of the flow charts of determining the frequency modulation output value in the embodiment of the present application;

[0060] Figure 3 The second flow chart of determining the frequency modulation output value in the embodiment of the present application;

[0061] Figure 4 The structure diagram of the primary frequency modulation device of the thermal power generating unit in the embodiment of the present application;

[0062] Figure 5 One of the structure diagrams of the frequency modulation output determination unit in the embodiment of the present application;

[0063] Figure 6 The second structure diagram of the frequency modulation output determination unit in the embodiment of the present application;

[0064] Figure 7 The structure schematic diagram of the electronic device in the embodiment of the present application;

[0065] Figure 8 The logical connection diagram in the embodiment of the present application;

[0066] Figure 9A functional structure diagram in the embodiments of the present application;

[0067] Figure 10 An algorithm logic diagram in the embodiments of the present application;

[0068] Figure 11 An algorithm effect diagram in the embodiments of the present application. DETAILED DESCRIPTION

[0069] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0070] In an embodiment, referring to Figure 1 , in order to improve the response ability and stability performance of a thermal power generating unit in response to continuous small frequency difference network frequency fluctuation, and avoid the problem of low frequency oscillation of the thermal power generating unit caused by primary frequency modulation action, the present application provides a primary frequency modulation method of a thermal power generating unit, comprising:

[0071] S101: determining a frequency modulation output value Y according to a preset frequency modulation target value X, a frequency modulation recovery rate V1, a frequency modulation response rate V2, and a frequency deviation ΔF between an actual frequency and a rated frequency of the thermal power generating unit; T T ; the frequency modulation output value Y T includes a power adjustment instruction value P F and a valve position adjustment instruction value H F ;

[0072] S102: determining an actual power deviation ΔP according to an initial power deviation ΔP0 and the power adjustment instruction value P F ;

[0073] S103: determining a valve position final instruction value H according to an initial valve position instruction value H0 and the valve position adjustment instruction value H F , and inputting the valve position final instruction value H to a valve position control system DEH to realize primary frequency modulation of the thermal power generating unit.

[0074] ​It can be understood that the existing primary frequency modulation optimization technology improves the frequency modulation performance of the thermal power unit by enhancing the local speed inequality or increasing the additional compensation. When the existing primary frequency modulation optimization technology is used for frequency modulation, the primary frequency modulation of the thermal power unit is immediately activated after the grid frequency exceeds the dead zone, and the frequency modulation action is immediately restored after the grid frequency recovers to the dead zone. Therefore, in the actual operation of the thermal power unit, the grid frequency often fluctuates frequently near the dead zone, which causes the repeated action of the primary frequency modulation of the thermal power unit, causes the continuous change of the power of the thermal power unit, and easily leads to the low-frequency oscillation problem of the thermal power unit. Especially for the thermal power unit that has been optimized for primary frequency modulation, because the primary frequency modulation performance of the thermal power unit is strong, small fluctuations in the grid frequency can cause large swings in the load of the thermal power unit, and the low-frequency oscillation problem is more likely to occur, which threatens the safe operation of the power grid.

[0075] To solve the above problems, the present application provides a primary frequency modulation method for a thermal power unit, which can also be called a grid-source regulation low-frequency oscillation suppression method for a thermal power unit, which can improve the response capability and stability of the thermal power unit to continuous small frequency difference grid frequency fluctuations and avoid the low-frequency oscillation problem caused by primary frequency modulation.

[0076] Referring to Figure 8 and Figure 9 , the primary frequency modulation method for a thermal power unit or the grid-source regulation low-frequency oscillation suppression method for a thermal power unit provided by the present application can logically include a power grid frequency transmitter (or a steam turbine speed measurement probe), a unit power generation power transmitter, a low-frequency oscillation suppression control cabinet, a thermal power unit DEH control system, a thermal power unit CCS control system, and a thermal power unit steam distribution regulating valve. The power generation power transmitter is connected to the CCS control system through a signal cable, the frequency transmitter is connected to the low-frequency oscillation suppression control cabinet through a signal cable, the low-frequency oscillation suppression algorithm (provided by the present application) is embedded in an independent control cabinet and connected to the DEH control system and the CCS control system through a signal cable, the CCS control system is connected to the DEH control system through a signal cable, and the DEH control system is connected to the steam distribution regulating valve through an electro-hydraulic servo control system. The DEH control system is used to control the steam admission amount of the steam turbine generator; the CCS control system is used to control the steam admission pressure of the steam turbine generator and the actual power generation power of the steam turbine generator; and the low-frequency oscillation suppression control cabinet is used to output a frequency modulation instruction, which will be described in detail below.

[0077] From the above description, the primary frequency modulation method of the thermal power generating unit provided by the application can make the thermal power generating unit rapidly step action according to the load demand in the initial stage of the primary frequency modulation response, guarantee the rapidity of the primary frequency modulation, and when the primary frequency modulation is in the callback action, the callback is performed at the set adjustment rate, the rate of the power callback action of the distribution valve and the unit is reduced, resonance between the power of the thermal power generating unit and the network frequency is avoided, the network frequency is normally damped and asynchronously adjusted on the power supply side, and the frequency oscillation problem of the thermal power generating unit caused by the primary frequency modulation action is inhibited.

[0078] In an embodiment, referring to Figure 2 , the frequency modulation target value X T comprises a power target value; the frequency modulation output value Y T comprises the power adjustment instruction value P F ; the frequency modulation output value Y T is determined according to the preset frequency modulation target value X T , the frequency modulation recovery rate V1, the frequency modulation response rate V2, and the frequency deviation ΔF between the actual frequency and the rated frequency of the thermal power generating unit.

[0079] S201: determining a first difference value between the power target value X T and a power initial output value (initial Y T );

[0080] S202: judging whether the frequency deviation ΔF is greater than zero, and determining the power adjustment instruction value P F according to the first judgment result, the frequency modulation recovery rate V1, the frequency modulation response rate V2, and the first difference value;

[0081] S203: judging whether the power adjustment instruction value P F reaches the power target value, if not, replacing the power initial output value with the power adjustment instruction value, and iteratively performing the above steps until the power adjustment instruction value P F reaches the power target value.

[0082] It can be understood that the above steps S201 to S203 can be seen from Figure 10 . The so-called first judgment result can correspond to the two "ΔF < 0" judgment boxes on the left side in Figure 10 .

[0083] In an embodiment, referring to Figure 10 , the first judgment result is that the frequency deviation ΔF is less than zero; the power adjustment instruction value P F, the greater between the negative value of the frequency modulation response rate V2 and the first output value is taken as a second output value, and the sum of the second output value and the current actual power is taken as the power adjustment instruction value P F .

[0084] In an embodiment, referring to Figure 10 , the first judgment result is that the frequency deviation ΔF is greater than zero; and the power adjustment instruction value P F is determined according to the first judgment result, the frequency modulation response rate V1, the frequency modulation response rate V2 and the first difference value, and includes: taking the greater between the negative value of the frequency modulation response rate V1 and the first difference value as a first output value, taking the smaller between the frequency modulation response rate V2 and the first output value as a second output value, and taking the sum of the second output value and the current actual power as the power adjustment instruction value P F .

[0085] It should be noted that, in the embodiments of the present application, referring to Figure 10 , X T is an oscillation suppression algorithm input, i.e., a frequency modulation instruction target value, Y T is an algorithm output value, V1 is a response rate, and V2 is a response rate. Among them, -V1 and -V2 are deceleration rates, and V1 and V2 are acceleration rates. According to the positive and negative of the frequency deviation ΔF, the frequency modulation process can be divided into two categories: deceleration instruction (X T <0) and acceleration instruction (X T >0). Each type of instruction can be divided into a fast response and a limited speed recovery process.

[0086] Taking a 350 MW thermal power generating unit as an example, referring to Table 1 (350 MW thermal power generating unit frequency deviation load function) and Table 2 (350 MW thermal power generating unit frequency deviation valve position function) below. When the frequency deviation ΔF <0, i.e., the acceleration instruction (X T >0), the deceleration rate is selected as -V1, the acceleration rate is selected as V2, the difference between X T -Y T and -V1 is taken as a large value, and the large values of the two are taken as V2. Taking the oscillation suppression of the frequency modulation load instruction as an example, V1 is usually set to a small value, for example, 1, and V2 is set to a large value, for example, 1000. Assuming that the frequency deviation ΔF =-0.2133 at this time, the frequency modulation load instruction X T =28. Assuming that the initial value of Y T is 0, X T -Y T =28 is taken as the greater result of -V1 =-1. 28 and V2 =1000 are taken as the smaller, and the selected result is 28. Y T+1 =Y T+28=28, at this time the oscillation suppression algorithm output is 28. When the frequency difference recovers to the dead zone -0.033, X T =0, at this time Y T =28, the deceleration rate is still -V1, and the acceleration rate is still V2, X T -Y T =-28 and the large election result of -V1=-1 is -1, and the small election result of -1 and V2=1000 is -1, Y T+1 =Y T -1=27, at this time the oscillation suppression algorithm output is calculated by reducing 1 per iteration until the target value, i.e. 0. The acceleration instruction oscillation suppression process is as shown in Figure 11 .

[0087] As can be seen from Figure 11 , after the method described in the present application is used, the response speed in the fast response process of the frequency modulation instruction is not affected; when the frequency difference exceeds the dead zone, the algorithm output immediately coincides with the target instruction; when the frequency difference returns to the dead zone, in the speed limiting recovery process, the target instruction returns to 0, but the oscillation suppression output slowly decreases to 0 at a preset rate, avoiding the immediate return of the frequency modulation instruction output to 0 when the frequency difference returns to 0, thereby suppressing the oscillation caused by the reciprocating fluctuation of the frequency difference.

[0088] As can be seen from the above description, the primary frequency modulation method for the thermal power generating unit provided in the present application can determine the frequency modulation output value Y T according to the preset frequency modulation target value X T , the frequency modulation recovery rate V1, the frequency modulation response rate V2, and the frequency deviation ΔF between the actual frequency and the rated frequency of the thermal power generating unit.

[0089] In an embodiment, referring to Figure 3 , the frequency modulation target value X T includes a valve position target value; the frequency modulation output value Y T includes the valve position adjustment instruction value H F ; and the determination of the frequency modulation output value Y T according to the preset frequency modulation target value X T , the frequency modulation recovery rate V1, the frequency modulation response rate V2, and the frequency deviation ΔF between the actual frequency and the rated frequency of the thermal power generating unit includes:

[0090] S301: determining a second difference value between the valve position target value X T and the valve position initial output value (initial Y T );

[0091] S302: judging whether the frequency deviation ΔF is greater than zero, and determining the valve position adjustment instruction value H F according to the second judgment result, the frequency modulation recovery rate V1, the frequency modulation response rate V2, and the second difference value.

[0092] S303: judging the valve position adjustment instruction value H F whether the valve position target value is reached, if not, using the valve position adjustment instruction value H F replacing the valve position initial output value, and iterating the above steps until the valve position adjustment instruction value H F the valve position target value is reached.

[0093] It can be understood that the above steps S301 to S303 can be seen from Figure 10 . The so-called first judgment result can correspond to Figure 10 two "ΔF < 0" judgment boxes on the left side in the figure.

[0094] In an embodiment, the second judgment result is that the frequency deviation ΔF is less than zero; and the determination of the valve position adjustment instruction value H F according to the second judgment result, the frequency recovery rate V1, the frequency response rate V2 and the second difference value includes: taking the larger one between the negative value of the frequency recovery rate V1 and the second difference value as a first output value, taking the smaller one between the frequency response rate V2 and the first output value as a second output value, and taking the sum of the second output value and the current actual valve position as the valve position adjustment instruction value H F .

[0095] In an embodiment, the second judgment result is that the frequency deviation ΔF is greater than zero; and the determination of the valve position adjustment instruction value H F according to the second judgment result, the frequency recovery rate V1, the frequency response rate V2 and the second difference value includes: taking the larger one between the negative value of the frequency response rate V2 and the second difference value as a first output value, taking the smaller one between the frequency recovery rate V1 and the first output value as a second output value, and taking the sum of the second output value and the current actual valve position as the valve position adjustment instruction value H F .

[0096] The above valve position calculation control method is similar to the power adjustment control method, and specific examples are as follows.

[0097] Taking a 350 MW thermal power unit as an example, referring to Table 2 (350 MW thermal power unit frequency difference valve position function) below. When the frequency difference ΔF < 0, i.e. the increase instruction (X T > 0), the deceleration rate is selected-V1, the acceleration rate is selected V2, X T - Y TThe difference between V1 and -V1 is the larger value, and the larger value is the smaller value between them and V2. Taking the frequency modulation valve position command oscillation suppression as an example, V1 is usually set to a smaller value, such as 0.5, and V2 is set to a larger value, such as 1000. Assuming that the frequency difference ΔF = -0.2133, the frequency modulation load command X T =8. Let Y T The initial value is 0, then X T -Y T =8 and -V1=-0.5, the general election result is 8. 8 and V2=1000, the small election result is 8. T+1 =Y T +8=8, at this time the oscillation suppression algorithm output is 8. When the frequency difference recovers to the dead zone -0.033, X T =0, then Y T =8, the deceleration rate is still -V1, the acceleration rate is still V2, X T -Y T = -8 and -V1 = -0.5, the general election result is -0.5, -0.5 and V2 = 1000, the small election result is -0.5, Y T+1 =Y T -0.5=7.5. At this time, the output of the oscillation suppression algorithm decreases by 0.5 at each iteration until the target value is 0.

[0098] From the above description, it can be seen that the primary frequency regulation method of the thermal power unit provided by this application can be used according to the preset frequency regulation target value X. T , frequency modulation recovery rate V1, frequency modulation response rate V2 and the frequency deviation ΔF between the actual frequency and the rated frequency of the thermal power unit determine the frequency modulation output value Y T .

[0099] In one embodiment, the power adjustment instruction value P is adjusted according to the initial power deviation ΔP0 and the power adjustment instruction value P F Determine the actual power deviation ΔP, including:

[0100] The initial power deviation ΔP0 is compared with the power adjustment instruction value P F Add them together to obtain the actual power deviation ΔP.

[0101] In one embodiment, the valve position initial command value H0, the valve position adjustment command value H F Determine the final valve position command value H, including:

[0102] The valve position initial instruction value H0 and the valve position adjustment instruction value H F Add them together to obtain the final valve position command value.

[0103] In order to better illustrate the method described in this application, an embodiment is now given for illustration.

[0104] ① After the local transmitter measures the actual power P of the unit, it is sent to Figure 8 The CCS control system shown in the figure compares the actual power P of the unit with the power setting value P s Compare and get the initial power deviation, ΔP0=PP S .

[0105] ② After the local transmitter measures the actual frequency F of the unit, it is sent to Figure 8 The low-frequency oscillation suppression control cabinet shown compares the actual frequency F with the rated frequency F0 to obtain a frequency deviation, ΔF=F-F0, where F0=50Hz.

[0106] ③In Figure 8 In the low-frequency oscillation suppression control cabinet shown in the figure, the frequency difference is converted into a frequency modulation load instruction (also called power adjustment instruction value) P by using the function module and the frequency difference load function. F Taking a 350MW thermal power unit as an example, the frequency difference load function can be seen in Table 1.

[0107] Table 1 Frequency difference load function of 350MW thermal power unit

[0108] ΔF (Hz) -0.2133 -0.033 0.033 0.2133 P F (MW) 28 0 0 -28

[0109] Frequency regulation load instruction (also called power adjustment instruction value) P F After the frequency modulation oscillation suppression algorithm (corresponding to the above steps S201 to S203 and the embodiments described later), it is transmitted to the CCS system through the signal cable. The instruction is superimposed on the power setting value to calculate the final power deviation ΔP. Wherein, ΔP=ΔP0+P F =P F +PP S .

[0110] ④ Power deviation ΔP as Figure 8 The input of the steam turbine master control in the CCS system shown is calculated by the PID controller to obtain the initial value H0 of the comprehensive valve position instruction, and the initial value H0 of the comprehensive valve position instruction is transmitted to the DEH system through the signal cable.

[0111] ⑤In Figure 8 In the low-frequency oscillation suppression control cabinet shown in the figure, the frequency difference is converted into the frequency modulation valve position instruction H by using the function module and the frequency difference valve position function. F Taking a 350MW thermal power unit as an example, the frequency difference valve position function can be seen in Table 2.

[0112] Table 2 Frequency difference valve position function of 350MW thermal power unit

[0113] ΔF (Hz) -0.2133 -0.033 0.033 0.2133 H F (%)]] 8 0 0 -8

[0114] Frequency modulation valve position command H F After the frequency modulation oscillation suppression algorithm (corresponding to the above steps S301 to S303 and the embodiments described later), the frequency modulation valve position command H Figure 8 is sent to the DEH system as shown in the figure. The frequency modulation valve position command H F is superimposed on the initial value H0 of the integrated valve position command, and the final integrated valve position command H can be calculated, wherein H = H0 + H F . The final integrated valve position command H is sent to the electro-hydraulic servo system. The electro-hydraulic servo system can adjust the steam distribution valve according to the integrated valve position command H to change the unit power, thereby realizing the primary frequency modulation response of the unit.

[0115] Based on the same inventive concept, the embodiment of the present application also provides a primary frequency modulation device of a thermal power generating unit, which can be used to realize the method described in the above embodiments, as described in the following embodiments. Since the principle of solving the problem of the primary frequency modulation device of the thermal power generating unit is similar to that of the primary frequency modulation method of the thermal power generating unit, the implementation of the primary frequency modulation device of the thermal power generating unit can be referred to the implementation of the method of determining the software performance benchmark, and the repeated parts will not be described herein. The term "unit" or "module" used below can be a combination of software and / or hardware that realizes a predetermined function. Although the system described in the following embodiments is preferably realized in software, the implementation of hardware or a combination of software and hardware is also possible and is conceived.

[0116] In an embodiment, referring to Figure 4 , in order to improve the response ability and stability performance of the thermal power generating unit in response to continuous small frequency difference network frequency fluctuations, and to avoid the problem of low frequency oscillation of the thermal power generating unit caused by primary frequency modulation action, the present application provides a primary frequency modulation device of a thermal power generating unit, comprising: a frequency modulation output determination unit 401, a power deviation determination unit 402, and a primary frequency modulation unit 403.

[0117] The frequency modulation output determination unit 401 is configured to determine a frequency modulation output value Y T according to a preset frequency modulation target value X T , a frequency modulation recovery rate V1, a frequency modulation response rate V2, and a frequency deviation ΔF between the actual frequency and the rated frequency of the thermal power generating unit. T The frequency modulation output value Y F includes a power adjustment instruction value P F and a valve position adjustment instruction value H F ;

[0118] The power deviation determination unit 402 is configured to determine an actual power deviation ΔP according to an initial power deviation ΔP0 and the power adjustment instruction value P F .

[0119] The primary frequency modulation unit 403 is configured to determine a valve position final instruction value H according to the valve position initial instruction value H0, the valve position adjustment instruction value H F and input the valve position final instruction value H to a valve position control system DEH to implement primary frequency modulation of the thermal power generating unit.

[0120] In an embodiment, referring to Figure 5 , the frequency modulation target value X T comprises a power target value; and the frequency modulation output value Y T comprises the frequency modulation output determination unit 401, which comprises a first difference determination module 501, a power instruction adjustment module 502 and a power target determination module 503.

[0121] The first difference determination module 501 is configured to determine a first difference between the power target value X T and a power initial output value initial Y T .

[0122] The power instruction adjustment module 502 is configured to determine whether the frequency deviation ΔF is greater than zero, and determine the power adjustment instruction value P F according to a first determination result, the frequency modulation recovery rate V1, the frequency modulation response rate V2 and the first difference.

[0123] The power target determination module 503 is configured to determine whether the power adjustment instruction value P F reaches the power target value, and if not, replace the power initial output value with the power adjustment instruction value and iterate the above steps until the power adjustment instruction value P F reaches the power target value.

[0124] In an embodiment, the first determination result is that the frequency deviation ΔF is less than zero; and the power instruction adjustment module is specifically configured to:

[0125] determine a larger one between a negative value of the frequency modulation recovery rate V1 and the first difference as a first output value, determine a smaller one between the frequency modulation response rate V2 and the first output value as a second output value, and determine a sum of the second output value and a current actual power as the power adjustment instruction value P F .

[0126] In an embodiment, the first determination result is that the frequency deviation ΔF is greater than zero; and the power instruction adjustment module is specifically configured to:

[0127] determine a larger one between a negative value of the frequency modulation response rate V2 and the first difference as a first output value, determine a smaller one between the frequency modulation recovery rate V1 and the first output value as a second output value, and determine a sum of the second output value and a current actual power as the power adjustment instruction value PF .

[0128] In one embodiment, referring to Figure 6 , the frequency modulation target value X T includes: a valve position target value; the frequency modulation output value Y T includes: the valve position adjustment instruction value H F ; the frequency modulation output determination unit 401 includes: a second difference determination module 601, a valve position instruction adjustment module 602, and a valve position target determination module 603.

[0129] The second difference determination module 601 is configured to determine a second difference between the valve position target value X T and the valve position initial output value initial Y T .

[0130] The valve position instruction adjustment module 602 is configured to determine whether the frequency deviation ΔF is greater than zero, and determine the valve position adjustment instruction value H F according to a second determination result, the frequency modulation recovery rate V1, the frequency modulation response rate V2, and the second difference.

[0131] The valve position target determination module 603 is configured to determine whether the valve position adjustment instruction value H F reaches the valve position target value, and if not, replace the valve position initial output value with the valve position adjustment instruction value H F , and iteratively perform the above steps until the valve position adjustment instruction value H F reaches the valve position target value.

[0132] In one embodiment, the second determination result is that the frequency deviation ΔF is less than zero; and the frequency modulation output determination unit 401 is specifically configured to:

[0133] determine the greater one between the negative value of the frequency modulation recovery rate V1 and the second difference as a first output value, determine the smaller one between the frequency modulation response rate V2 and the first output value as a second output value, and determine the sum of the second output value and the current actual valve position as the valve position adjustment instruction value H F .

[0134] In one embodiment, the second determination result is that the frequency deviation ΔF is greater than zero; and the frequency modulation output determination unit 401 is specifically configured to:

[0135] determine the greater one between the negative value of the frequency modulation response rate V2 and the second difference as a first output value, determine the smaller one between the frequency modulation recovery rate V1 and the first output value as a second output value, and determine the sum of the second output value and the current actual valve position as the valve position adjustment instruction value H F .

[0136] In one embodiment, the power deviation determining unit 402 is specifically configured to:

[0137] The initial power deviation is added to the power adjustment instruction value to obtain the actual power deviation.

[0138] In one embodiment, the primary frequency modulation unit 403 is specifically configured to:

[0139] The valve position initial instruction value and the valve position adjustment instruction value are added to obtain the valve position final instruction value.

[0140] From a hardware perspective, in order to improve the responsiveness and stability of thermal power units to continuous small-frequency grid frequency fluctuations and avoid the problem of low-frequency oscillation of thermal power units caused by primary frequency modulation, the present application provides an embodiment of an electronic device for implementing all or part of the primary frequency modulation method of the thermal power unit. The electronic device specifically includes the following:

[0141] A processor, a memory, a communications interface, and a bus; wherein the processor, memory, and communications interface communicate with each other via the bus; the communications interface is used to transmit information between the primary frequency regulation device of the thermal power unit and related devices such as the core business system, user terminals, and related databases; the logic controller can be a desktop computer, a tablet computer, a mobile terminal, etc., but this embodiment is not limited thereto. In this embodiment, the logic controller can be implemented with reference to the embodiments of the primary frequency regulation method for a thermal power unit and the embodiments of the primary frequency regulation device for a thermal power unit in the embodiments, the contents of which are incorporated herein and repeated parts are not repeated.

[0142] It is understandable that the user terminal may include a smart phone, a tablet electronic device, a network set-top box, a portable computer, a desktop computer, a personal digital assistant (PDA), a vehicle-mounted device, a smart wearable device, etc. Among them, the smart wearable device may include smart glasses, a smart watch, a smart bracelet, etc.

[0143] In practical applications, portions of the primary frequency regulation method for a thermal power unit can be performed on the electronic device side as described above, or all operations can be performed on the client device. The specific method can be selected based on the processing capabilities of the client device and the limitations of the user's usage scenario. This application does not impose any restrictions on this. If all operations are performed on the client device, the client device may also include a processor.

[0144] The client device may include a communication module (i.e., a communication unit) that can establish a communication connection with a remote server to implement data transmission with the server. The server may include a server on the task scheduling center side, and in other implementation scenarios, may also include a server on an intermediate platform, such as a server on a third-party server platform that has a communication link with the task scheduling center server. The server may include a single computer device, a server cluster consisting of multiple servers, or a server structure of a distributed device.

[0145] Figure 7 Schematic block diagram of the system structure of the electronic device 9600 according to an embodiment of the present application. Figure 7 As shown, the electronic device 9600 may include a central processing unit 9100 and a memory 9140; the memory 9140 is coupled to the central processing unit 9100. It is worth noting that the Figure 7 is exemplary; other types of structures may also be used to supplement or replace this structure to implement telecommunication functions or other functions.

[0146] In one embodiment, the primary frequency regulation method function of the thermal power unit can be integrated into the central processing unit 9100. The central processing unit 9100 can be configured to perform the following control:

[0147] S101: According to the preset frequency modulation target value X T , frequency modulation recovery rate V1, frequency modulation response rate V2 and the frequency deviation ΔF between the actual frequency and the rated frequency of the thermal power unit determine the frequency modulation output value Y T ; The frequency modulation output value Y T Including power adjustment command value P F And valve position adjustment command value H F ;

[0148] S102: Adjust the power command value P according to the initial power deviation ΔP0 and the power F Determine the actual power deviation ΔP;

[0149] S103: According to the valve position initial instruction value H0, the valve position adjustment instruction value H F The final valve position command value H is determined, and the final valve position command value H is input into the valve position control system DEH to achieve primary frequency regulation of the thermal power unit.

[0150] From the above description, the primary frequency modulation method of the thermal power generating unit provided by the application can make the thermal power generating unit rapidly step action according to the load demand in the initial stage of the primary frequency modulation response, ensure the rapidity of the primary frequency modulation, and when the primary frequency modulation is in the callback action, the callback is performed at a set adjustment rate, the rate of the power callback action of the distribution valve and the unit is reduced, resonance of the thermal power generating unit power and the network frequency is avoided, the network frequency is normally damped asynchronously regulated on the power supply side, and the power grid frequency oscillation is inhibited, the response capability and the stability performance of the thermal power generating unit in response to the continuous small frequency difference network frequency fluctuation are improved, and the problem of the low frequency oscillation of the thermal power generating unit caused by the primary frequency modulation action is avoided.

[0151] In another embodiment, the primary frequency modulation device of the thermal power generating unit can be configured separately from the central processor 9100, for example, the data composite transmission device primary frequency modulation device of the thermal power generating unit can be configured as a chip connected with the central processor 9100, and the function of the primary frequency modulation method of the thermal power generating unit is realized through the control of the central processor.

[0152] As shown in Figure 7 , the electronic device 9600 can further include a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It should be noted that the electronic device 9600 does not necessarily include all the components shown in Figure 7 ; in addition, the electronic device 9600 can further include components not shown in Figure 7 , which can be referred to the prior art.

[0153] As shown in Figure 7 , the central processor 9100 is also sometimes referred to as a controller or an operation control, which can include a microprocessor or other processor device and / or a logic device, the central processor 9100 receives input and controls the operation of each component of the electronic device 9600.

[0154] The memory 9140, for example, can be one or more of a cache, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, or other suitable device. The information related to the failure can be stored, and in addition, programs for executing the related information can be stored. The central processor 9100 can execute the programs stored in the memory 9140 to realize information storage or processing, etc.

[0155] The input unit 9120 provides input to the central processor 9100. The input unit 9120 is, for example, a key or a touch input device. The power supply 9170 is used to provide power to the electronic device 9600. The display 9160 is used to display display objects such as images and text. The display can be, for example, an LCD display, but is not limited thereto.

[0156] The memory 9140 can be a solid state memory such as a read only memory (ROM), a random access memory (RAM), a SIM card, or the like. It can also be a memory that retains information even when power is off, can be selectively erased, and is provided with more data, an example of which is sometimes referred to as an EPROM or the like. The memory 9140 can also be some other type of device. The memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 can include an application / function storage 9142 for storing application programs and function programs or for storing a flow for executing an operation of the electronic device 9600 by the central processing unit 9100.

[0157] The memory 9140 can also include a data storage 9143 for storing data such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. A driver storage 9144 of the memory 9140 can include various drivers of the electronic device for a communication function and / or for performing other functions of the electronic device such as a messaging application, a phonebook application, and the like.

[0158] The communication module 9110 is a transmitter / receiver 9110 that transmits and receives signals via an antenna 9111. The communication module (transmitter / receiver) 9110 is coupled to the central processing unit 9100 to provide input signals and receive output signals, which can be the same as in the case of a conventional mobile communication terminal.

[0159] Based on different communication technologies, a plurality of communication modules 9110 such as a cellular network module, a Bluetooth module, and / or a wireless local area network module, and the like can be provided in the same electronic device. The communication module (transmitter / receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide audio output via the speaker 9131 and receive audio input from the microphone 9132, thereby implementing a conventional telecommunication function. The audio processor 9130 can include any suitable buffer, decoder, amplifier, and the like. In addition, the audio processor 9130 is also coupled to the central processing unit 9100, thereby enabling recording on the local device through the microphone 9132 and enabling playing of a sound stored on the local device through the speaker 9131.

[0160] The embodiment of the present application further provides a computer readable storage medium capable of realizing all steps of the primary frequency modulation method of the thermal power generating unit with the execution subject being the server or the client in the above-mentioned embodiment, and the computer program is stored on the computer readable storage medium, and when the processor executes the computer program, all steps of the primary frequency modulation method of the thermal power generating unit with the execution subject being the server or the client in the above-mentioned embodiment are realized, for example, the following steps are realized when the processor executes the computer program:

[0161] S101: determining a frequency modulation output value Y according to a preset frequency modulation target value X, a frequency modulation recovery rate V1, a frequency modulation response rate V2 and a frequency deviation ΔF between the actual frequency and the rated frequency of the thermal power generating unit T ; T ; the frequency modulation output value Y T includes a power adjustment instruction value P F and a valve position adjustment instruction value H F ;

[0162] S102: determining an actual power deviation ΔP according to an initial power deviation ΔP0 and the power adjustment instruction value P F ;

[0163] S103: determining a valve position final instruction value H according to an initial valve position instruction value H0, the valve position adjustment instruction value H F , and inputting the valve position final instruction value H into a valve position control system DEH to realize the primary frequency modulation of the thermal power generating unit.

[0164] As known from the above description, the primary frequency modulation method of the thermal power generating unit provided by the present application can make the thermal power generating unit rapidly step action according to the load demand in the initial primary frequency modulation response stage, and ensure the rapidity of the primary frequency modulation; when the primary frequency modulation is in the callback action, the callback is performed at a set adjustment rate, the rate of the power callback action of the steam distribution valve and the unit is reduced, the resonance between the power of the thermal power generating unit and the grid frequency is avoided, the grid frequency is normally damped and asynchronously adjusted on the power supply side, and the grid frequency oscillation is inhibited; the response capability and the stability performance of the thermal power generating unit in response to the continuous small frequency deviation grid frequency fluctuation are improved, and the problem of the low frequency oscillation of the thermal power generating unit caused by the primary frequency modulation action is avoided.

[0165] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a device or a computer program product. Therefore, the present application can adopt a completely hardware embodiment, a completely software embodiment or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) containing computer usable program codes.

[0166] The computer program instructions can 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 Figure 1 one or more functions specified in the flowchart or multiple flows and / or blocks. Figure 1 one or more functions specified in the flowchart or multiple flows and / or blocks.

[0167] These computer program instructions can 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 an instruction device that implements the functions specified in the flowchart Figure 1 one or more functions specified in the flowchart or multiple flows and / or blocks. Figure 1 one or more functions specified in the flowchart or multiple flows and / or blocks.

[0168] These computer program instructions can 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 Figure 1 one or more functions specified in the flowchart or multiple flows and / or blocks. Figure 1 Figure 1 one or more functions specified in the flowchart or multiple flows and / or blocks.

[0169] The principles and implementation manners of the present application are described in the specific embodiments, and the above embodiment descriptions are only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges can be changed, and the above description should not be understood as the limitation of the present application.

Claims

1. A primary frequency modulation method for a thermal power generating unit, characterized in that, The method comprises the following steps: determining a frequency output value according to a preset frequency modulation target value, a frequency modulation recovery rate, a frequency modulation response rate, and a frequency deviation between an actual frequency and a rated frequency of the thermal power generating unit; the frequency output value comprises a power adjustment instruction value and a valve position adjustment instruction value; determining an actual power deviation according to an initial power deviation and the power adjustment instruction value; determining a valve position final instruction value according to an initial valve position instruction value and the valve position adjustment instruction value, and inputting the valve position final instruction value into a valve position control system to realize primary frequency modulation of the thermal power generating unit; wherein the frequency modulation target value comprises a power target value; the frequency output value comprises the power adjustment instruction value; and the step of determining the frequency output value according to the preset frequency modulation target value, the frequency modulation recovery rate, the frequency modulation response rate, and the frequency deviation between the actual frequency and the rated frequency of the thermal power generating unit comprises: determining a first difference value between the power target value and a power initial output value; judging whether the frequency deviation is greater than zero, and determining the power adjustment instruction value according to a first judgment result, the frequency modulation recovery rate, the frequency modulation response rate, and the first difference value; judging whether the power adjustment instruction value reaches the power target value, and if not, replacing the power initial output value with the power adjustment instruction value, and iteratively performing the above steps until the power adjustment instruction value reaches the power target value; wherein the frequency modulation target value comprises a valve position target value; the frequency output value comprises the valve position adjustment instruction value; and the step of determining the frequency output value according to the preset frequency modulation target value, the frequency modulation recovery rate, the frequency modulation response rate, and the frequency deviation between the actual frequency and the rated frequency of the thermal power generating unit comprises: determining a second difference value between the valve position target value and a valve position initial output value; judging whether the frequency deviation is greater than zero, and determining the valve position adjustment instruction value according to a second judgment result, the frequency modulation recovery rate, the frequency modulation response rate, and the second difference value; judging whether the valve position adjustment instruction value reaches the valve position target value, and if not, replacing the valve position initial output value with the valve position adjustment instruction value, and iteratively performing the above steps until the valve position adjustment instruction value reaches the valve position target value.

2. The method for primary frequency regulation of a thermal power unit according to claim 1, characterized in that, the first judgment result is that the frequency deviation is less than zero; and the step of determining the power adjustment instruction value according to the first judgment result, the frequency modulation recovery rate, the frequency modulation response rate, and the first difference value comprises: taking the greater one between a negative value of the frequency modulation recovery rate and the first difference value as a first output value, taking the smaller one between the frequency modulation response rate and the first output value as a second output value, and taking the sum of the second output value and a current actual power as the power adjustment instruction value.

3. The method for primary frequency regulation of a thermal power unit according to claim 1, characterized in that, the first judgment result is that the frequency deviation is greater than zero; and the step of determining the power adjustment instruction value according to the first judgment result, the frequency modulation recovery rate, the frequency modulation response rate, and the first difference value comprises: The greater one between the negative value of the frequency recovery rate and the second difference value is taken as a first output value, the smaller one between the frequency response rate and the first output value is taken as a second output value, and the sum of the second output value and the current actual valve position is taken as the valve position adjustment instruction value.

4. The method of primary frequency regulation of a thermal power unit according to claim 1, characterized in that, The second judgment result is that the frequency deviation is greater than zero; and the determination of the valve position adjustment instruction value according to the second judgment result, the frequency recovery rate, the frequency response rate and the second difference value comprises: The greater one between the negative value of the frequency recovery rate and the second difference value is taken as a first output value, the smaller one between the frequency response rate and the first output value is taken as a second output value, and the sum of the second output value and the current actual valve position is taken as the valve position adjustment instruction value.

5. The method of primary frequency regulation of a thermal power unit according to claim 1, characterized in that, The second judgment result is that the frequency deviation is greater than zero; and the determination of the valve position adjustment instruction value according to the second judgment result, the frequency recovery rate, the frequency response rate and the second difference value comprises: The greater one between the negative value of the frequency recovery rate and the second difference value is taken as a first output value, the smaller one between the frequency response rate and the first output value is taken as a second output value, and the sum of the second output value and the current actual valve position is taken as the valve position adjustment instruction value.

6. The method of primary frequency regulation of a thermal power unit according to claim 1, characterized in that, The determination of the actual power deviation according to the initial power deviation and the power adjustment instruction value comprises: The actual power deviation is obtained by adding the initial power deviation and the power adjustment instruction value.

7. The method of primary frequency regulation of a thermal power unit according to claim 1, characterized in that, The determination of the valve position final instruction value according to the valve position initial instruction value and the valve position adjustment instruction value comprises: The valve position final instruction value is obtained by adding the valve position initial instruction value and the valve position adjustment instruction value.

8. A primary frequency modulation device for a thermal power generating unit, characterized in that, It comprises: A frequency modulation output determination unit is configured to determine a frequency modulation output value according to a preset frequency modulation target value, a frequency recovery rate, a frequency response rate and a frequency deviation between an actual frequency and a rated frequency of a thermal power generating unit. A power deviation determination unit is configured to determine an actual power deviation according to an initial power deviation and the power adjustment instruction value. A primary frequency modulation unit is configured to determine a valve position final instruction value according to a valve position initial instruction value and the valve position adjustment instruction value, and input the valve position final instruction value to a valve position control system to realize primary frequency modulation of the thermal power generating unit. The frequency modulation target value comprises a power target value; and the frequency modulation output determination unit comprises: A first difference value determination module is configured to determine a first difference value between the power target value and a power initial output value. A power instruction adjustment module is configured to determine whether the frequency deviation is greater than zero, and determine the power adjustment instruction value according to a first judgment result, the frequency recovery rate, the frequency response rate and the first difference value. A power target determination module is configured to determine whether the power adjustment instruction value reaches the power target value, and replace the power initial output value with the power adjustment instruction value if the power adjustment instruction value does not reach the power target value, and iteratively perform the above steps until the power adjustment instruction value reaches the power target value. The frequency modulation target value comprises a valve position target value; the frequency modulation output value comprises the valve position adjustment instruction value; the frequency modulation output determination unit comprises: A second difference determination module is configured to determine a second difference between the valve position target value and a valve position initial output value; A valve position instruction adjustment module is configured to determine whether the frequency deviation is greater than zero, and determine the valve position adjustment instruction value according to a second determination result, the frequency modulation recovery rate, the frequency modulation response rate and the second difference; A valve position target determination module is configured to determine whether the valve position adjustment instruction value reaches the valve position target value, and replace the valve position initial output value with the valve position adjustment instruction value if the valve position adjustment instruction value does not reach the valve position target value, and iteratively perform the above steps until the valve position adjustment instruction value reaches the valve position target value.

9. The device for primary frequency modulation of a thermal power unit according to claim 8, characterized in that The first determination result is that the frequency deviation is less than zero; and the power instruction adjustment module is specifically configured to: Determine the greater one between the negative value of the frequency modulation recovery rate and the first difference as a first output value, determine the smaller one between the frequency modulation response rate and the first output value as a second output value, and determine the sum of the second output value and a current actual power as the power adjustment instruction value.

10. The device for primary frequency modulation of a thermal power unit according to claim 8, characterized in that The first determination result is that the frequency deviation is greater than zero; and the power instruction adjustment module is specifically configured to: Determine the greater one between the negative value of the frequency modulation response rate and the first difference as a first output value, determine the smaller one between the frequency modulation recovery rate and the first output value as a second output value, and determine the sum of the second output value and a current actual power as the power adjustment instruction value.

11. The device for primary frequency modulation of a thermal power unit according to claim 8, characterized in that The second determination result is that the frequency deviation is less than zero; and the frequency modulation output determination unit is specifically configured to: Determine the greater one between the negative value of the frequency modulation recovery rate and the second difference as a first output value, determine the smaller one between the frequency modulation response rate and the first output value as a second output value, and determine the sum of the second output value and a current actual valve position as the valve position adjustment instruction value.

12. The device for primary frequency modulation of a thermal power unit according to claim 8, characterized in that The second determination result is that the frequency deviation is greater than zero; and the frequency modulation output determination unit is specifically configured to: Determine the greater one between the negative value of the frequency modulation response rate and the second difference as a first output value, determine the smaller one between the frequency modulation recovery rate and the first output value as a second output value, and determine the sum of the second output value and a current actual valve position as the valve position adjustment instruction value.

13. The device for primary frequency modulation of a thermal power unit according to claim 8, characterized in that The power deviation determination unit is specifically configured to: Add the initial power deviation and the power adjustment instruction value to obtain the actual power deviation.

14. The device for primary frequency modulation of a thermal power unit according to claim 8, characterized in that The primary frequency modulation unit is specifically configured to: Add the valve position initial instruction value and the valve position adjustment instruction value to obtain the valve position final instruction value.

15. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to implement the steps of the primary frequency modulation method of the thermal power generating unit according to any one of claims 1 to 7.

16. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the primary frequency modulation method of the thermal power generating unit according to any one of claims 1 to 7.

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