A method, device and computer readable storage medium for one-time frequency modulation

Abstract

The application discloses a primary frequency modulation method, device, equipment and computer readable storage medium. The method comprises the following steps: determining the influence degree and the maximum frequency modulation capacity of each available frequency modulation strategy on a thermal power generating unit; the available frequency modulation strategies comprise steam extraction valve adjustment, heat supply steam extraction adjustment, boiler heat storage adjustment and steam turbine main steam valve adjustment; determining the frequency modulation priority of each available frequency modulation strategy according to the influence degree of each available frequency modulation strategy; the frequency modulation priority of the steam turbine main steam valve adjustment is the highest; and distributing the target frequency modulation power in the frequency modulation instruction to the available frequency modulation strategies according to the order from low to high of the frequency modulation priority and the maximum frequency modulation capacity of each available frequency modulation strategy, so as to perform primary frequency modulation. The above technical scheme disclosed by the application gives priority to adopting the steam extraction valve adjustment, the heat supply steam extraction adjustment and the boiler heat storage adjustment to perform the primary frequency modulation, so that the primary frequency modulation is realized without completely adopting the steam turbine valve adjustment, thereby reducing the throttling loss, improving the efficiency and economic performance of the unit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of primary frequency modulation, and more particularly to a primary frequency modulation method, device, equipment and computer readable storage medium. BACKGROUND

[0002] When the grid frequency exceeds the frequency dead zone (50±0.033Hz) of the thermal power frequency, the thermal power unit should automatically change the unit output through its own primary frequency modulation function to maintain the frequency stability of the grid, and this process is the primary frequency modulation.

[0003] At present, the DEH (Digital Electric Hydraulic Control System) is generally used to control the turbine main steam gate of the thermal power unit to complete the primary frequency modulation action, but in the above primary frequency modulation method, the turbine gate is throttled, that is, a certain heat storage capacity is reserved to meet the frequency modulation demand, and the existence of the throttling loss will have a certain impact on the efficiency and economic performance of the thermal power unit.

[0004] In summary, how to reduce the throttling loss of the thermal power unit to improve the efficiency and economic performance of the thermal power unit is a technical problem to be solved by the technical personnel in the field at present. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a primary frequency modulation method, device, equipment and computer readable storage medium for reducing the throttling loss of the thermal power unit to improve the efficiency and economic performance of the thermal power unit.

[0006] In order to achieve the above purpose, the present application provides the following technical solutions:

[0007] A primary frequency modulation method, comprising:

[0008] determining the influence degree and the maximum frequency modulation capacity of each available frequency modulation strategy on the thermal power unit in operation; the available frequency modulation strategy includes steam extraction gate adjustment, heat supply steam extraction adjustment, boiler heat storage adjustment and turbine main steam gate adjustment;

[0009] determining the frequency modulation priority of each available frequency modulation strategy according to the influence degree of each available frequency modulation strategy; wherein the frequency modulation priority of the turbine main steam gate adjustment is the highest;

[0010] when receiving a frequency modulation instruction, distributing the target frequency modulation power in the frequency modulation instruction to the available frequency modulation strategies in the order from low to high of the frequency modulation priority and the maximum frequency modulation capacity of each available frequency modulation strategy, to utilize the available frequency modulation strategies with the distributed frequency modulation power to perform primary frequency modulation.

[0011] Preferably, the frequency modulation priorities of the available frequency modulation strategies are determined according to the influence degrees of the available frequency modulation strategies, comprising:

[0012] According to the influence degrees of the available frequency modulation strategies, the frequency modulation priorities of the extraction valve adjustment, the heating extraction adjustment, the boiler heat storage adjustment and the main steam valve adjustment of the steam turbine are sequentially increased.

[0013] Preferably, for the case that the power of the thermal power unit needs to be increased for primary frequency modulation when the grid frequency is lower than the dead zone, the available frequency modulation strategies further comprise the supplementary valve adjustment.

[0014] Correspondingly, the frequency modulation priorities of the available frequency modulation strategies are determined according to the influence degrees of the available frequency modulation strategies, comprising:

[0015] According to the influence degrees of the available frequency modulation strategies, the frequency modulation priorities of the extraction valve adjustment, the heating extraction adjustment, the boiler heat storage adjustment, the supplementary valve adjustment and the main steam valve adjustment of the steam turbine are sequentially increased.

[0016] Preferably, after receiving the frequency modulation instruction, the method further comprises:

[0017] If it is determined that there is an available frequency modulation strategy that cannot perform primary frequency modulation, the available frequency modulation strategy that cannot perform primary frequency modulation is deleted.

[0018] Preferably, the extraction valve adjustment comprises 0th extraction valve adjustment and 1st extraction valve adjustment.

[0019] Correspondingly, the target frequency modulation power in the frequency modulation instruction is allocated to the available frequency modulation strategies, comprising:

[0020] If it is determined that the current power of the thermal power unit is below the first power, the target frequency modulation power in the frequency modulation instruction is allocated to the 0th extraction valve adjustment and other available frequency modulation strategies.

[0021] If it is determined that the current power of the thermal power unit is above the second power, the target frequency modulation power in the frequency modulation instruction is allocated to the 1st extraction valve adjustment and other available frequency modulation strategies.

[0022] Wherein, the second power is greater than the first power.

[0023] Preferably, after receiving the frequency modulation instruction, the method further comprises:

[0024] It is determined whether the thermal power unit is currently in the heating season, and if not, the heating extraction adjustment is deleted.

[0025] A primary frequency modulation device, comprising:

[0026] The first determining module is configured to determine an influence degree and a maximum frequency modulation capacity of each available frequency modulation strategy on the thermal power generating unit at runtime, wherein the available frequency modulation strategies include steam extraction valve adjustment, heat supply and steam extraction adjustment, boiler heat storage adjustment, and turbine main steam valve adjustment.

[0027] The second determining module is configured to determine a frequency modulation priority of each available frequency modulation strategy according to the influence degree of each available frequency modulation strategy, wherein the frequency modulation priority of the turbine main steam valve adjustment is the highest.

[0028] The allocating module is configured to, when receiving a frequency modulation instruction, allocate a target frequency modulation power in the frequency modulation instruction to the available frequency modulation strategies according to the frequency modulation priority from low to high and the maximum frequency modulation capacity of each available frequency modulation strategy, so as to perform primary frequency modulation by using the available frequency modulation strategies to which the frequency modulation power is allocated.

[0029] Preferably, the second determining module comprises:

[0030] The first determining unit is configured to determine that the frequency modulation priority of the steam extraction valve adjustment, the heat supply and steam extraction adjustment, the boiler heat storage adjustment, and the turbine main steam valve adjustment is sequentially increased according to the influence degree of each available frequency modulation strategy.

[0031] The primary frequency modulation device comprises:

[0032] The memory is configured to store a computer program.

[0033] The processor is configured to implement the steps of the primary frequency modulation method according to any one of the above when executing the computer program.

[0034] A computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the steps of the primary frequency modulation method according to any one of the above.

[0035] The present application provides a primary frequency modulation method, device, equipment and computer readable storage medium, wherein the method comprises: determining an influence degree and a maximum frequency modulation capacity of each available frequency modulation strategy on a thermal power generating unit at runtime; the available frequency modulation strategies include steam extraction valve adjustment, heat supply and steam extraction adjustment, boiler heat storage adjustment, and turbine main steam valve adjustment; determining a frequency modulation priority of each available frequency modulation strategy according to the influence degree of each available frequency modulation strategy, wherein the frequency modulation priority of the turbine main steam valve adjustment is the highest; when receiving a frequency modulation instruction, allocating a target frequency modulation power in the frequency modulation instruction to the available frequency modulation strategies according to the frequency modulation priority from low to high and the maximum frequency modulation capacity of each available frequency modulation strategy, so as to perform primary frequency modulation by using the available frequency modulation strategies to which the frequency modulation power is allocated.

[0036] The above technical solution disclosed in the application determines the frequency modulation priority of each available frequency modulation strategy according to the influence degree of the determined steam extraction gate adjustment, heat supply steam extraction adjustment, boiler heat storage adjustment and steam turbine main steam gate adjustment on the operation of the thermal power generating unit, wherein the frequency modulation priority of the steam turbine main steam gate is the highest, and when the frequency modulation instruction is received, the target frequency modulation power in the frequency modulation instruction is distributed to the available frequency modulation strategies in the order from low to high of the frequency modulation priority and the determined maximum frequency modulation capacity of each available frequency modulation strategy, so that the available frequency modulation strategies distributed with the frequency modulation power are used for primary frequency modulation. Since the frequency modulation priority of the steam turbine main steam gate adjustment is higher than that of the steam extraction gate adjustment, heat supply steam extraction adjustment and boiler heat storage adjustment, the steam extraction gate adjustment, heat supply steam extraction adjustment and boiler heat storage adjustment are preferentially used for primary frequency modulation when primary frequency modulation is performed, so that the primary frequency modulation is realized by using the steam turbine gate adjustment as much as possible, thereby minimizing the throttling loss and facilitating the improvement of the efficiency and economic performance of the thermal power generating unit. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0038] Figure 1 A flowchart of a primary frequency modulation method provided for the embodiments of the present application;

[0039] Figure 2 A flowchart of another primary frequency modulation method provided for the embodiments of the present application;

[0040] Figure 3 A structural schematic diagram of a primary frequency modulation device provided for the embodiments of the present application;

[0041] Figure 4 A structural schematic diagram of a primary frequency modulation device provided for the embodiments of the present application. DETAILED DESCRIPTION

[0042] When the grid frequency exceeds the dead zone (50±0.033Hz) of the thermal power frequency, the thermal power generating unit should automatically change the unit output through its primary frequency modulation function to maintain the stability of the grid frequency, and this process is the primary frequency modulation. The primary frequency modulation function of the thermal power generating unit belongs to the basic auxiliary service that must be provided by the thermal power generating unit when connected to the grid.

[0043] At present, because the new energy power production represented by wind power and solar energy has the characteristics of poor stability and strong time variation, therefore, the continuous input of new energy leads to the continuous aggravation of the load peak and valley of the power grid, and this brings adverse effects to the active balance of the power system, so the frequency and intensity of the primary frequency modulation of the power grid are also enhanced.

[0044] At present, the DEH control turbine main steam control valve is generally used to complete the primary frequency modulation action of the thermal power unit, however, the primary frequency modulation through the control of the turbine main steam control valve will have throttling loss, and when the grid frequency frequently changes, the turbine control valve needs to be adjusted frequently, which will cause serious throttling loss, thereby causing the efficiency and economic performance of the thermal power unit to greatly decrease.

[0045] Therefore, the present application provides a primary frequency modulation technical scheme for reducing the throttling loss of the thermal power unit to improve the efficiency and economic performance of the thermal power unit.

[0046] In order to make the person skilled in the art more clearly understand the technical scheme, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor are within the scope of protection of the present application.

[0047] Referring to Figure 1 which shows a flow chart of a primary frequency modulation method provided by the embodiments of the present application, the primary frequency modulation method provided by the embodiments of the present application can include:

[0048] S11: determining the influence degree and the maximum frequency modulation capacity of each available frequency modulation strategy on the thermal power unit in operation; the available frequency modulation strategy includes steam extraction control valve adjustment, heating steam extraction adjustment, boiler heat storage adjustment, and turbine main steam control valve adjustment.

[0049] In the primary frequency modulation method provided by the present application, in order to make the primary frequency modulation method proceed smoothly, the following preparation work can be done in advance:

[0050] First step: on-site equipment modification

[0051] The on-site equipment of the thermal power unit can be modified in advance, which specifically includes the following contents:

[0052] 1) increase the steam extraction adjustment door for adjusting the steam extraction amount of each section;

[0053] 2) calculate the safety reinforcement cost of the support hanger due to the pipe vibration problem caused by the change of the No. 1 steam extraction amount and the heating steam extraction amount, and modify according to the demand;

[0054] 3) Control system equipment hardware optimization, installation, configuration modification, logic modification and optimization, online testing, etc. Complete the optimization process.

[0055] Second step: control strategy optimization

[0056] The main role of control strategy optimization is to enhance the response of the thermal system when performing primary frequency modulation action. After calling the valve action, the system's other responses are more reasonable. For example, when calling the No. 1 high-pressure heater extraction valve, the valve logic, other valves on the extraction pipe, and the water level of the high-pressure heater need to be optimized to ensure that the system remains relatively stable when the No. 1 extraction valve is called for primary frequency modulation action.

[0057] The specific optimization content of control strategy optimization includes:

[0058] 1) No. 1 high-pressure heater extraction valve control logic

[0059] 2) No. 1 high-pressure heater extraction pipe valve control logic (such as electric door, check door)

[0060] 3) No. 1 high-pressure heater water level control

[0061] 4) Heating extraction auxiliary frequency modulation logic

[0062] 5) Water-coal ratio fast response compliance control optimization

[0063] 6) Main steam valve fine frequency modulation optimization

[0064] 7) Multiple heat storage mode coordinated frequency modulation main control strategy optimization

[0065] Third step: field test part

[0066] Make full use of the heat balance diagram provided by the turbine manufacturer under various working conditions to calculate the limit frequency modulation capacity of the extraction valve under various working conditions, and conduct tests at different load points to obtain the basic proportional relationship between the No. 0 extraction valve (if any), No. 1 extraction valve, heating extraction valve opening and load change, as well as load response time and other parameters.

[0067] Through the supplementary valve characteristic test, the action characteristics of the supplementary valve are analyzed, especially the unit vibration caused by the load change of the supplementary valve, and the frequency modulation capacity of the supplementary valve is fully utilized.

[0068] Through the boiler heat storage capacity test, the influence characteristics of the boiler heat storage capacity on the unit load, pressure, and steam temperature under various load sections in the direct current state are tested, as well as the boundary conditions of heat storage capacity utilization. In order to reasonably utilize the boiler heat storage for primary frequency modulation and even AGC auxiliary adjustment under the premise of safety, improve the performance of primary frequency modulation and AGC.

[0069] Fourth step: logic modification and parameter optimization part

[0070] Add a primary frequency extraction frequency factor loop in the on-site DCS, modify the No. 1 extraction valve, heating extraction automatic regulation logic, add override logic to the original single extraction pressure regulation, that is, the function corresponding to the No. 1 extraction valve and the heating extraction valve action amplitude of the calculated speed conversion is calculated during primary frequency regulation, and load correction is performed. According to the data of the wisdom energy storage extraction frequency regulation pre-experiment, fill in the respective primary frequency regulation initial parameters.

[0071] After the above preparation work is completed, each frequency regulation strategy can be controlled to be put into the thermal power generating unit to determine whether each frequency regulation strategy is available, wherein the frequency regulation strategy mentioned here can specifically include extraction valve regulation, heating extraction regulation, boiler heat storage regulation, and steam turbine main steam valve regulation, and whether available contains whether it causes the emergency break of the power generating unit, the damage of the equipment, the temperature and pressure exceeding the automatic protection limit, and the like. If none of the foregoing situations occurs when the control strategy is put into the thermal power generating unit, it is determined that the control strategy is available.

[0072] If it is determined that each frequency regulation strategy is available, each available frequency regulation strategy is determined as an available frequency regulation strategy. After determining each available frequency regulation strategy, the influence degree of each available frequency regulation strategy on the thermal power generating unit when put into the thermal power generating unit can be determined, and the maximum frequency regulation capacity corresponding to each available frequency regulation strategy when put into the thermal power generating unit can be determined. The influence degree of each available frequency regulation strategy on the thermal power generating unit when running can be determined by the change of the running parameter of the thermal power generating unit caused by each available calling strategy when running, specifically, the extraction valve regulation will cause the wall temperature fluctuation amplitude of the high-pressure heater to increase, the heating extraction regulation will cause the heating temperature fluctuation amplitude to increase, the boiler heat storage regulation will cause the wall temperature fluctuation amplitude of the boiler to increase, and the steam turbine main steam valve regulation will cause throttling loss, thereby causing the economy to be lost. For details, see Table 1, which shows the change of the running parameter caused by each available frequency regulation strategy when running:

[0073] Table 1 Change of running parameter caused by each available frequency regulation strategy when running

[0074]

[0075] The importance of the unit economy, the boiler wall temperature, the heat supply temperature, and the wall temperature of the high-pressure heater decreases in turn, and correspondingly, the influence of the turbine main steam regulating, the boiler heat storage regulating, the heat supply steam extraction regulating, and the steam extraction valve regulating on the thermal power unit decreases in turn.

[0076] S12: Determine the frequency modulation priority of each available frequency modulation strategy according to the influence degree of each available frequency modulation strategy; wherein, the frequency modulation priority of the turbine main steam regulating is the highest.

[0077] After step S11 is executed, the frequency modulation priority of each available frequency modulation strategy can be determined according to the influence degree of each available frequency modulation strategy, specifically, the priority of each available frequency modulation strategy can be determined according to the influence degree of each available frequency modulation strategy on the thermal power unit in turn decreases. When determining the priority, the determined frequency modulation priority of the turbine main steam regulating is the highest.

[0078] S13: When receiving the frequency modulation instruction, the target frequency modulation power in the frequency modulation instruction is allocated to the available frequency modulation strategies in the order from low to high of the frequency modulation priority and the maximum frequency modulation capacity of each available frequency modulation strategy, so as to utilize the available frequency modulation strategies allocated with the frequency modulation power to perform frequency modulation.

[0079] When the frequency modulation of the power grid is needed, the frequency modulation instruction of the power grid or the user can be received, wherein, the target frequency modulation power is contained in the frequency modulation instruction. After receiving the frequency modulation instruction, the target frequency modulation power in the frequency modulation instruction can be allocated to the available frequency modulation strategies in the order from low to high of the frequency modulation priority of each available frequency modulation strategy, combined with the maximum frequency modulation capacity of each available frequency modulation strategy, specifically, the maximum frequency modulation capacity of the available frequency modulation strategy with the lowest frequency modulation priority is used to allocate the frequency modulation power first, wherein, if the target frequency modulation power is less than or equal to the maximum frequency modulation capacity of the available frequency modulation strategy with the lowest frequency modulation priority, the target frequency modulation power is allocated to the available frequency modulation strategy with the lowest frequency modulation priority completely, if the target frequency modulation power is greater than the maximum frequency modulation capacity of the available frequency modulation strategy with the lowest frequency modulation priority, after allocating the frequency modulation power equal to the corresponding maximum frequency modulation capacity to the available frequency modulation strategy with the lowest frequency modulation priority, the remaining target frequency modulation power is allocated to other available frequency modulation strategies in the same way as the available frequency modulation strategy with the lowest frequency modulation priority, until the allocation of the target frequency modulation power is completed, so as to utilize the available frequency modulation strategies allocated with the frequency modulation power to perform frequency modulation.

[0080] Since the frequency modulation priority of the turbine main steam control valve is the highest, the above process is to allocate the frequency modulation power to the available frequency modulation strategies whose frequency modulation priorities are lower than that of the turbine main steam control valve, and since the available frequency modulation strategies whose frequency modulation priorities are lower than that of the turbine main steam control valve do not need to adjust the turbine control valve, specifically, the extraction steam control valve adjustment, the heat extraction steam adjustment and the boiler heat storage adjustment are all adjustments from the steam extraction of the turbine and the adjustment of the heat storage capacity of the boiler at the boiler position, therefore, compared with the prior art which completely relies on the turbine main steam control valve for primary frequency modulation, the mode of the present application which preferentially utilizes the extraction steam control valve adjustment, the heat extraction steam adjustment and the boiler heat storage adjustment for primary frequency modulation with lower frequency modulation priorities than the turbine main steam control valve can minimize throttling loss, thereby improving the efficiency and economic performance of the thermal power unit.

[0081] The above technical solution disclosed in the present application determines the frequency modulation priorities of the available frequency modulation strategies according to the determined influence degrees of the extraction steam control valve adjustment, the heat extraction steam adjustment, the boiler heat storage adjustment and the turbine main steam control valve adjustment on the thermal power unit in operation, wherein the frequency modulation priority of the turbine main steam control valve is the highest, and when receiving the frequency modulation instruction, the target frequency modulation power in the frequency modulation instruction is allocated to the available frequency modulation strategies in order of the frequency modulation priorities from low to high and the determined maximum frequency modulation capacity of each available frequency modulation strategy, so as to utilize the available frequency modulation strategies allocated with the frequency modulation power for primary frequency modulation, and since the frequency modulation priority of the turbine main steam control valve is higher than those of the extraction steam control valve adjustment, the heat extraction steam adjustment and the boiler heat storage adjustment, the extraction steam control valve adjustment, the heat extraction steam adjustment and the boiler heat storage adjustment will be preferentially utilized for primary frequency modulation to avoid the complete utilization of the turbine control valve adjustment for primary frequency modulation, thereby minimizing throttling loss and facilitating the improvement of the efficiency and economic performance of the thermal power unit.

[0082] The one-time frequency modulation method provided by the embodiment of the present application determines the frequency modulation priorities of the available frequency modulation strategies according to the influence degrees of the available frequency modulation strategies, which can include:

[0083] According to the influence degrees of the available frequency modulation strategies, the frequency modulation priorities of the extraction steam control valve adjustment, the heat extraction steam adjustment, the boiler heat storage adjustment and the turbine main steam control valve adjustment are sequentially increased.

[0084] In determining the frequency modulation priority of each available frequency modulation strategy according to the influence degree of each available frequency modulation strategy, the frequency modulation priority of the turbine main steam gate adjustment, the boiler heat storage adjustment, the heating extraction steam adjustment, and the extraction steam gate adjustment can be determined to be sequentially decreased according to the situation that the influence degree of the turbine main steam gate adjustment, the boiler heat storage adjustment, the heating extraction steam adjustment, and the extraction steam gate adjustment on the thermal power generating unit is sequentially decreased, that is, the frequency modulation priority of the extraction steam gate adjustment, the heating extraction steam adjustment, the boiler heat storage adjustment, and the turbine main steam gate adjustment is sequentially increased, so as to allocate the target frequency modulation power according to the order of the frequency modulation priority.

[0085] Specifically, for the case that the power grid frequency is higher than the dead zone and the power generation power of the thermal power generating unit needs to be reduced, or the power grid frequency is lower than the dead zone and the power generation power of the thermal power generating unit needs to be increased, each available frequency modulation strategy can act in the following manner:

[0086] 1) The extraction steam gate adjustment is first used for frequency modulation;

[0087] 2) If the extraction steam gate adjustment is still insufficient to meet the frequency modulation demand according to the maximum frequency modulation capacity, the heating extraction steam adjustment is used for frequency modulation;

[0088] 3) If the heating extraction steam adjustment is still insufficient to meet the frequency modulation demand according to the maximum frequency modulation capacity, the boiler heat storage adjustment is used for frequency modulation;

[0089] 4) If the above strategies are still insufficient to meet the frequency modulation demand, the turbine main steam gate adjustment is used for frequency modulation.

[0090] The one-time frequency modulation method provided in the embodiment of the application can further include the steam supplement valve adjustment for the case that the power grid frequency is lower than the dead zone and the power generation power of the thermal power generating unit needs to be increased.

[0091] Correspondingly, determining the frequency modulation priority of each available frequency modulation strategy according to the influence degree of each available frequency modulation strategy can include:

[0092] According to the influence degree of each available frequency modulation strategy, the frequency modulation priority of the extraction steam gate adjustment, the heating extraction steam adjustment, the boiler heat storage adjustment, the steam supplement valve adjustment, and the turbine main steam gate adjustment is sequentially increased.

[0093] In the present application, for the case that the power grid frequency is lower than the dead zone and the power of the thermal power unit needs to be increased, in addition to the above-mentioned adjustment of the extraction steam valve, the heat extraction steam valve, the boiler heat storage, and the main steam valve of the steam turbine, the supplementary steam valve adjustment can also be added to the available frequency modulation strategies. The supplementary steam valve adjustment specifically refers to supplementing steam to the steam turbine, which will cause the vibration amplitude of the unit to increase when put into operation. The importance of the supplementary steam valve adjustment is higher than that of the boiler wall temperature, but lower than that of the unit economy. Therefore, the influence of the supplementary steam valve adjustment on the thermal power unit is higher than that of the boiler heat storage adjustment and lower than that of the main steam valve adjustment of the steam turbine. Thus, when the frequency modulation priorities of the available frequency modulation strategies are determined according to the influence of each available frequency modulation strategy, the frequency modulation priorities of the extraction steam valve adjustment, the heat extraction steam valve adjustment, the boiler heat storage adjustment, the supplementary steam valve adjustment, and the main steam valve adjustment of the steam turbine are sequentially increased, so that the above-mentioned frequency modulation priorities can be used for one-time frequency modulation when the power grid frequency is lower than the dead zone.

[0094] Specifically, for the case that the power grid frequency is lower than the dead zone and the power of the thermal power unit needs to be increased, each available frequency modulation strategy can act in the following manner:

[0095] 1) First, the extraction steam valve adjustment is used for one-time frequency modulation;

[0096] 2) If the extraction steam valve adjustment is still insufficient to meet the frequency modulation demand even after the maximum frequency modulation capacity is used, the heat extraction steam valve adjustment is used for one-time frequency modulation;

[0097] 3) If the heat extraction steam valve adjustment is still insufficient to meet the frequency modulation demand even after the maximum frequency modulation capacity is used, the boiler heat storage adjustment is used for one-time frequency modulation;

[0098] 4) If the boiler heat storage adjustment is still insufficient to meet the frequency modulation demand even after the maximum frequency modulation capacity is used, the supplementary steam valve adjustment is used for one-time frequency modulation;

[0099] 5) If the above strategies are still insufficient to meet the frequency modulation demand even after the maximum frequency modulation capacity is used, the main steam valve adjustment of the steam turbine is used for one-time frequency modulation.

[0100] In addition, it should be noted that when the supplementary steam valve adjustment is needed for one-time frequency modulation, it needs to meet the basic requirements of full opening of the main steam valve and the current power of the thermal power unit being above a preset power (which can be 75% Pn, Pn being the rated power of the thermal power unit) before participating in one-time frequency modulation.

[0101] The one-time frequency modulation method provided in the present application can further include the following steps after receiving the frequency modulation instruction:

[0102] If it is determined that there is an available frequency modulation strategy that cannot be used for one-time frequency modulation, the available frequency modulation strategy that cannot be used for one-time frequency modulation is deleted.

[0103] After receiving the frequency modulation instruction, it can be determined whether each available frequency modulation strategy can normally perform one-time frequency modulation. If it is determined that there is an available frequency modulation strategy that cannot perform one-time frequency modulation, the available frequency modulation strategy that cannot perform one-time frequency modulation is deleted to avoid the available frequency modulation strategy that cannot perform one-time frequency modulation affecting the one-time frequency modulation process. At the same time, one-time frequency modulation can be performed in combination with the remaining available frequency modulation strategies.

[0104] The one-time frequency modulation method provided by the embodiment of the application can include 0th steam extraction gate adjustment and 1st steam extraction gate adjustment.

[0105] Correspondingly, the target frequency modulation power in the frequency modulation instruction can be allocated to the available frequency modulation strategies, which can include:

[0106] If it is determined that the current power of the thermal power generating unit is below the first power, the target frequency modulation power in the frequency modulation instruction is allocated to the 0th steam extraction gate adjustment and other available frequency modulation strategies.

[0107] If it is determined that the current power of the thermal power generating unit is above the second power, the target frequency modulation power in the frequency modulation instruction is allocated to the 1st steam extraction gate adjustment and other available frequency modulation strategies.

[0108] The second power is greater than the first power.

[0109] In the application, the steam extraction gate adjustment can include 0th steam extraction gate adjustment and 1st steam extraction gate adjustment. When the frequency modulation priority of the steam extraction gate adjustment is the lowest, the process of allocating the target frequency modulation power in the frequency modulation instruction to the available frequency modulation strategies is specifically: if it is determined that the current power of the thermal power generating unit is below the first power, the target frequency modulation power in the frequency modulation instruction is allocated to the 0th steam extraction gate adjustment and other available frequency modulation strategies; if it is determined that the current power of the thermal power generating unit is above the second power, the target frequency modulation power in the frequency modulation instruction is allocated to the 1st steam extraction gate adjustment and other available frequency modulation strategies. The second power is greater than the first power. Specifically, the first power can be 75% Pn, and the second power can be 80% Pn.

[0110] The above process can avoid the situation that the 0th steam extraction gate adjustment and the 1st steam extraction gate adjustment are called at the same time. It should be noted that for the adjustment condition not containing the 0th steam extraction gate adjustment, the 1st steam extraction gate adjustment still participates in the one-time frequency modulation work only when the current power of the thermal power generating unit is above the second power. For the adjustment condition not containing the 0th steam extraction gate adjustment, please refer to Figure 2 FIG. 2 shows a flowchart of another one-time frequency modulation method provided by the embodiment of the application.

[0111] The one-time frequency modulation method provided by the embodiment of the application can further include:

[0112] determining whether the thermal power unit is currently in the heating season, and if not, deleting the heating extraction regulation.

[0113] In the present application, after receiving the frequency regulation instruction, it can be determined whether the thermal power unit is currently in the heating season, and if not, the heating extraction regulation is deleted to avoid the extraction of steam from the steam turbine without the need for heating, which causes energy waste, and if it is the heating season, the heating extraction regulation can be put into operation in the whole period.

[0114] In addition, for the boiler heat storage regulation and the steam turbine main steam regulating valve regulation, both can be put into operation in the whole period when needed, which can be seen from Table 2 and Table 3, wherein Table 2 shows the basic input requirement table of each available frequency regulation strategy in the process of increasing power when the grid frequency is lower than the dead zone, and Table 3 shows the basic input requirement table of each available frequency regulation strategy in the process of reducing power when the grid frequency is higher than the dead zone:

[0115] Table 2 Basic input requirement table of each available frequency regulation strategy in the process of increasing power

[0116]

[0117] Table 3 Basic input requirement table of each available frequency regulation strategy in the process of reducing power

[0118]

[0119]

[0120] From Table 2 and Table 3, it can be seen that when receiving the frequency regulation instruction and having available frequency regulation strategies participating in the primary frequency regulation, it can be determined whether the current environment meets the basic input requirement of the available frequency regulation strategy corresponding to the primary frequency regulation, and if it meets the basic input requirement, the subsequent corresponding steps are executed to participate in the primary frequency regulation, so as to facilitate the rationality of the primary frequency regulation.

[0121] The present application also provides a primary frequency regulation device, which is shown in Figure 3 which shows the structure diagram of the primary frequency regulation device provided by the present application, which can include:

[0122] The first determination module 21 is configured to determine the influence degree and the maximum frequency regulation capacity of each available frequency regulation strategy on the thermal power unit during operation; the available frequency regulation strategy can include the extraction regulating valve regulation, the heating extraction regulation, the boiler heat storage regulation, and the steam turbine main steam regulating valve regulation.

[0123] The second determining module 22 is configured to determine a frequency modulation priority of each available frequency modulation strategy according to an influence degree of each available frequency modulation strategy; and the frequency modulation priority of the turbine main steam valve adjustment is the highest.

[0124] The distribution module 23 is configured to, when receiving the frequency modulation instruction, distribute target frequency modulation power in the frequency modulation instruction to the available frequency modulation strategies in order of the frequency modulation priority from low to high and maximum frequency modulation capacity of each available frequency modulation strategy, so as to perform one-time frequency modulation by using the available frequency modulation strategies distributed with the frequency modulation power.

[0125] The one-time frequency modulation device provided by the embodiment of the present application can further comprise:

[0126] The first determining unit is configured to determine that the frequency modulation priority of the extraction steam valve adjustment, the heating extraction steam adjustment, the boiler heat storage adjustment, and the turbine main steam valve adjustment is sequentially increased.

[0127] The one-time frequency modulation device provided by the embodiment of the present application can further comprise:

[0128] Correspondingly, the second determining module 22 can comprise:

[0129] The second determining unit is configured to determine that the frequency modulation priority of the extraction steam valve adjustment, the heating extraction steam adjustment, the boiler heat storage adjustment, the extraction steam valve adjustment, and the turbine main steam valve adjustment is sequentially increased.

[0130] The one-time frequency modulation device provided by the embodiment of the present application can further comprise:

[0131] The first deleting module is configured to, after receiving the frequency modulation instruction, if it is determined that there is an available frequency modulation strategy that cannot perform one-time frequency modulation, delete the available frequency modulation strategy that cannot perform one-time frequency modulation.

[0132] The one-time frequency modulation device provided by the embodiment of the present application can further comprise:

[0133] Correspondingly, the distribution module 23 can comprise:

[0134] The first distribution unit is configured to, if it is determined that the current power of the thermal power generating unit is below the first power, distribute the target frequency modulation power in the frequency modulation instruction to the 0th extraction steam valve adjustment and other available frequency modulation strategies.

[0135] The second distribution unit is configured to, if it is determined that the current power of the thermal power generating unit is above the second power, distribute the target frequency modulation power in the frequency modulation instruction to the 1st extraction steam valve adjustment and other available frequency modulation strategies.

[0136] wherein the second power is greater than the first power.

[0137] The primary frequency modulation device provided by the embodiment of the present application can further comprise:

[0138] The second deleting module is configured to determine whether the thermal power generating unit is currently in the heating season after receiving the frequency modulation instruction, and delete the heating extraction steam regulation if not.

[0139] The embodiment of the present application further provides a primary frequency modulation device, referring to Figure 4 which shows a structural schematic diagram of the primary frequency modulation device provided by the embodiment of the present application, and can comprise:

[0140] The memory 31 is configured to store the computer program.

[0141] The processor 32 is configured to implement the following steps when executing the computer program stored in the memory 31.

[0142] The influence degree and the maximum frequency modulation capacity of each available frequency modulation strategy on the thermal power generating unit during operation are determined, the available frequency modulation strategies include the extraction steam valve regulation, the heating extraction steam regulation, the boiler heat storage regulation and the steam turbine main steam valve regulation, the frequency modulation priorities of the available frequency modulation strategies are determined according to the influence degree of each available frequency modulation strategy, the frequency modulation priority of the steam turbine main steam valve regulation is the highest, and the target frequency modulation power in the frequency modulation instruction is distributed to the available frequency modulation strategies according to the order from low to high of the frequency modulation priorities and the maximum frequency modulation capacity of each available frequency modulation strategy when receiving the frequency modulation instruction, so that the primary frequency modulation is performed by using the available frequency modulation strategies to which the frequency modulation power is distributed.

[0143] The embodiment of the present application further provides a computer readable storage medium, and the computer readable storage medium stores a computer program, and the computer program can implement the following steps when executed by a processor.

[0144] The influence degree and the maximum frequency modulation capacity of each available frequency modulation strategy on the thermal power generating unit during operation are determined, the available frequency modulation strategies include the extraction steam valve regulation, the heating extraction steam regulation, the boiler heat storage regulation and the steam turbine main steam valve regulation, the frequency modulation priorities of the available frequency modulation strategies are determined according to the influence degree of each available frequency modulation strategy, the frequency modulation priority of the steam turbine main steam valve regulation is the highest, and the target frequency modulation power in the frequency modulation instruction is distributed to the available frequency modulation strategies according to the order from low to high of the frequency modulation priorities and the maximum frequency modulation capacity of each available frequency modulation strategy when receiving the frequency modulation instruction, so that the primary frequency modulation is performed by using the available frequency modulation strategies to which the frequency modulation power is distributed.

[0145] The computer readable storage medium can include a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media capable of storing program codes.

[0146] The description of the one-time frequency adjustment device, the equipment and the related part of the computer readable storage medium provided in the embodiments of the present application can refer to the detailed description of the corresponding part in the one-time frequency adjustment method provided in the embodiments of the present application, which will not be repeated here.

[0147] It should be noted that, in this paper, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment inherent in the process, method, article or equipment including a series of elements. Without more limitations, the element defined by the sentence "including one" does not exclude the presence of other identical elements in the process, method, article or equipment including the element. In addition, the above technical solutions provided in the embodiments of the present application and the corresponding technical solution implementation principles in the prior art are not described in detail to avoid excessive repetition.

[0148] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of frequency modulation, characterized in that, The method comprises the following steps: determining the influence degree and the maximum frequency modulation capacity of each available frequency modulation strategy on the thermal power unit at runtime; the available frequency modulation strategies include steam extraction valve adjustment, heat supply steam extraction adjustment, boiler heat storage adjustment, and turbine main steam valve adjustment; determining the frequency modulation priority of the steam extraction valve adjustment, the heat supply steam extraction adjustment, the boiler heat storage adjustment, and the turbine main steam valve adjustment in turn according to the influence degree of each available frequency modulation strategy; when receiving a frequency modulation instruction, distributing the target frequency modulation power in the frequency modulation instruction to the available frequency modulation strategies according to the order from low to high of the frequency modulation priority and the maximum frequency modulation capacity of each available frequency modulation strategy, so as to perform primary frequency modulation by using the available frequency modulation strategies to which the frequency modulation power is distributed; for the case of primary frequency modulation of increasing the power of the thermal power unit when the grid frequency is lower than the dead zone, the available frequency modulation strategies further include steam supply valve adjustment; correspondingly, determining the frequency modulation priority of each available frequency modulation strategy according to the influence degree of each available frequency modulation strategy comprises: determining the frequency modulation priority of the steam extraction valve adjustment, the heat supply steam extraction adjustment, the boiler heat storage adjustment, the steam supply valve adjustment, and the turbine main steam valve adjustment in turn according to the influence degree of each available frequency modulation strategy; the steam extraction valve adjustment includes 0th steam extraction valve adjustment and 1st steam extraction valve adjustment; correspondingly, distributing the target frequency modulation power in the frequency modulation instruction to the available frequency modulation strategies comprises: if it is determined that the current power of the thermal power unit is below a first power, distributing the target frequency modulation power in the frequency modulation instruction to the 0th steam extraction valve adjustment and other available frequency modulation strategies; if it is determined that the current power of the thermal power unit is above a second power, distributing the target frequency modulation power in the frequency modulation instruction to the 1st steam extraction valve adjustment and other available frequency modulation strategies; wherein the second power is greater than the first power.

2. The method of claim 1, wherein, after receiving the frequency modulation instruction, the method further comprises: if it is determined that there is an available frequency modulation strategy that cannot perform primary frequency modulation, deleting the available frequency modulation strategy that cannot perform primary frequency modulation.

3. The method of claim 1, wherein, after receiving the frequency modulation instruction, the method further comprises: determining whether the thermal power unit is currently in the heating season, and if not, deleting the heat supply steam extraction adjustment.

4. A frequency modulation device, characterized by comprising: The method comprises the following steps: a first determining module is configured to determine the influence degree and the maximum frequency modulation capacity of each available frequency modulation strategy on the thermal power unit at runtime; the available frequency modulation strategies include steam extraction valve adjustment, heat supply steam extraction adjustment, boiler heat storage adjustment, and turbine main steam valve adjustment; The second determining module is configured to determine, according to the influence degree of each of the available frequency modulation strategies, that the frequency modulation priority of the extraction valve adjustment, the heating extraction adjustment, the boiler heat storage adjustment and the main steam valve adjustment of the steam turbine increases in turn; for a case that the power of the thermal power generating unit needs to be increased for primary frequency modulation when the grid frequency is lower than a dead zone, the available frequency modulation strategies further include a steam supplement valve adjustment; accordingly, according to the influence degree of each of the available frequency modulation strategies, the frequency modulation priority of the extraction valve adjustment, the heating extraction adjustment, the boiler heat storage adjustment, the steam supplement valve adjustment and the main steam valve adjustment of the steam turbine increases in turn; The distribution module is configured to, when receiving a frequency modulation instruction, distribute target frequency modulation power in the frequency modulation instruction to the available frequency modulation strategies in order of the frequency modulation priority from low to high and the maximum frequency modulation capacity of each of the available frequency modulation strategies, so as to perform primary frequency modulation by using the available frequency modulation strategies to which the frequency modulation power is distributed; wherein the extraction valve adjustment includes 0th extraction valve adjustment and 1st extraction valve adjustment; accordingly, the distribution of the target frequency modulation power in the frequency modulation instruction to the available frequency modulation strategies includes: if it is determined that the current power of the thermal power generating unit is below a first power, distributing the target frequency modulation power in the frequency modulation instruction to the 0th extraction valve adjustment and other available frequency modulation strategies; if it is determined that the current power of the thermal power generating unit is above a second power, distributing the target frequency modulation power in the frequency modulation instruction to the 1st extraction valve adjustment and other available frequency modulation strategies; wherein the second power is greater than the first power.

5. A frequency modulation device, characterized by The computer readable storage medium stores a computer program, and the computer program is executed by the processor to implement the steps of the primary frequency modulation method according to any one of claims 1 to 3. The computer readable storage medium stores a computer program, and the computer program is executed by the processor to implement the steps of the primary frequency modulation method according to any one of claims 1 to 3. ​ 6. A computer-readable storage medium, characterized in that, ​

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