A method, device and medium for improving the contribution rate of primary frequency regulation power

Abstract

The present application discloses a method, device and medium for improving the contribution rate of primary frequency regulation power, which relates to the technical field of thermal control in thermal power plants. By obtaining the actual frequency of the generating unit; judging whether the first frequency deviation is within a preset range, where the first frequency deviation is the difference between the actual frequency and the rated frequency; if not, obtaining the theoretical load adjustment amount, target load value, actual load value, theoretical contribution power and actual contribution power during the primary frequency regulation time of the generating unit; wherein, the target load value is the preset load value of the generating unit; obtaining a first correction amount according to the target load value and the actual load value, which is used to offset the reverse influence of the load's own change on the frequency regulation process; obtaining a second correction amount according to the actual contribution power and the theoretical contribution power, realizing the feedback control of the power contribution amount, making the actual contribution power as close as possible to the theoretical contribution power, so as to obtain the actual load adjustment amount and improve the power contribution rate during the primary frequency regulation process.

Description

Technical Field

[0001] The present application relates to the technical field of thermal control in thermal power plants, and particularly to a method, device and medium for improving the contribution rate of primary frequency regulation power. Background Technique

[0002] In the operation of the power grid, maintaining the stability of the power grid frequency is an important means to ensure the safe operation of the power grid. When the power consumption is lower than the power generation, the power grid frequency is higher than the rated frequency (50 Hz), and at this time, the power generation needs to be reduced to maintain the power grid frequency stable; when the power consumption is higher than the power generation, the power grid frequency is lower than the rated power, and at this time, the power generation needs to be increased to maintain the power grid frequency stable. Primary frequency regulation refers to the process in which when the power grid frequency exceeds the dead zone of frequency regulation, the generator set automatically adjusts its power generation to maintain the power grid frequency stable. As the proportion of renewable energy power generation in the power grid gradually increases, the intermittency and volatility of renewable energy power generation pose higher requirements for the stability of the power grid frequency, and thus higher requirements for the primary frequency regulation ability of thermal power units. An important index to examine the primary frequency regulation ability of thermal power units is the contribution rate of power, that is, the ratio of the actual contribution power of the unit during frequency regulation to the theoretical contribution power, and generally the contribution rate of power is required to be not less than 75%. At present, the reference load for calculating the actual contribution power generally selects the unit load at the start time of frequency regulation, or the average value of the unit load in the 10 seconds before the start of frequency regulation.

[0003] However, due to the irregular fluctuation of the unit load and its large fluctuation amplitude relative to the magnitude of the frequency regulation load adjustment, the deviation of the selected reference load is large, resulting in the contribution rate of primary frequency regulation power calculated finally being lower than the assessment requirements in many cases.

[0004] Based on the above problems, designing a method for improving the contribution rate of primary frequency regulation power is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of the present application is to provide a method, device and medium for improving the contribution rate of primary frequency regulation power.

[0006] To solve the above technical problems, the present application provides a method for improving the contribution rate of primary frequency regulation power, including:

[0007] Obtain the actual frequency of the generator set;

[0008] Judge whether the first frequency deviation is within a preset range, where the first frequency deviation is the difference between the actual frequency and the rated frequency;

[0009] If not, obtain the theoretical load adjustment amount, target load value, actual load value, theoretical contribution power, and actual contribution power during the primary frequency regulation of the generator set; wherein, the target load value is the preset load value of the generator set.

[0010] Obtain a first correction amount based on the target load value and the actual load value.

[0011] Obtain a second correction amount based on the theoretical contribution power and the actual contribution power.

[0012] Wherein, the first correction amount and the second correction amount represent the correction amounts for the load adjustment of the generator set.

[0013] Obtain the actual load adjustment amount based on the theoretical load adjustment amount, the first correction amount, and the second correction amount for adjusting the load of the generator set.

[0014] Preferably, obtaining the actual contribution power includes:

[0015] Obtain the reference load value of the generator set; wherein, the reference load value is set at the start of the primary frequency regulation of the generator set.

[0016] Obtain the actual contribution power based on the reference load value and the actual load value.

[0017] Preferably, before obtaining the reference load value of the generator set, it further includes:

[0018] Judge whether the first frequency deviation is within the preset range before the first preset time.

[0019] If not, enter the step of obtaining the reference load value of the generator set.

[0020] If so, set the reference load value and enter the step of obtaining the reference load value of the generator set.

[0021] Preferably, setting the reference load value includes:

[0022] When the first frequency deviation is greater than the maximum value of the preset range, set the minimum load value of the generator set within the second preset time before the primary frequency regulation as the reference load value.

[0023] When the first frequency deviation is less than the minimum value of the preset range, set the maximum load value of the generator set within the second preset time before the primary frequency regulation as the reference load value.

[0024] Preferably, obtaining the theoretical load adjustment amount includes:

[0025] Obtain the second frequency deviation, and obtain the rated power, rated frequency, and speed regulation rate of the generator set;

[0026] Obtain the theoretical load adjustment amount according to the second frequency deviation, the rated power, the rated frequency, and the speed regulation rate;

[0027] Wherein, when the difference between the actual frequency and the rated frequency is not less than the maximum value of the preset range, the second frequency deviation is the sum of the difference and the minimum value of the preset range;

[0028] When the difference between the actual frequency and the rated frequency is less than the minimum value of the preset range, the second frequency deviation is the sum of the difference and the maximum value of the preset range.

[0029] Preferably, adjusting the load of the generator set includes:

[0030] Obtain a valve position adjustment command according to the characteristic relationship between the valve position and the load and the actual load adjustment amount;

[0031] Send the valve position adjustment command and the actual load adjustment amount to the generator set to adjust the load of the generator set.

[0032] Preferably, after adjusting the load of the generator set, it further includes:

[0033] Return to the step of obtaining the actual frequency of the generator set.

[0034] To solve the above technical problems, the present application also provides a device for improving the contribution rate of primary frequency regulation power, including:

[0035] A first acquisition module for acquiring the actual frequency of the generator set;

[0036] A judgment module for judging whether the first frequency deviation is within a preset range, where the first frequency deviation is the difference between the actual frequency and the rated frequency; if not, trigger the second acquisition module;

[0037] The second acquisition module is used to acquire the theoretical load adjustment amount, target load value, actual load value, theoretical contribution power, and actual contribution power during the primary frequency regulation of the generator set; wherein, the target load value is the preset load value of the generator set;

[0038] A third acquisition module for acquiring a first correction amount according to the target load value and the actual load value;

[0039] A fourth acquisition module, configured to obtain a second correction amount according to the theoretical contribution power and the actual contribution power; wherein, the first correction amount and the second correction amount represent correction amounts for load adjustment of the generator set.

[0040] A fifth acquisition module, configured to obtain an actual load adjustment amount according to the theoretical load adjustment amount, the first correction amount, and the second correction amount, so as to adjust the load of the generator set.

[0041] To solve the above technical problems, the present application further provides another device for improving the contribution rate of primary frequency modulation power, including:

[0042] A memory, configured to store a computer program;

[0043] A processor, configured to implement the steps of the method for improving the contribution rate of primary frequency modulation power described above when executing the computer program.

[0044] To solve the above technical problems, the present application further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the method for improving the contribution rate of primary frequency modulation power described above are implemented.

[0045] The method for improving the contribution rate of primary frequency modulation power provided by the present application includes: obtaining the actual frequency of the generator set; determining whether a first frequency deviation is within a preset range, where the first frequency deviation is the difference between the actual frequency and the rated frequency; if not, obtaining the theoretical load adjustment amount, the target load value, the actual load value, the theoretical contribution power, and the actual contribution power during the primary frequency modulation time of the generator set; wherein, the target load value is the preset load value of the generator set; obtaining a first correction amount according to the target load value and the actual load value, for offsetting the reverse influence of the load's own change on the frequency modulation process; obtaining a second correction amount according to the actual contribution power and the theoretical contribution power, realizing the feedback control of the power contribution amount, making the actual contribution power as close as possible to the theoretical contribution power, thereby obtaining the actual load adjustment amount and improving the contribution rate of power during the primary frequency modulation process.

[0046] In addition, the present application further provides a device and a computer-readable storage medium for improving the contribution rate of primary frequency modulation power, with the same effect. Description of the Drawings

[0047] To more clearly illustrate the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0048] Figure 1Flow chart of a method for improving the contribution rate of primary frequency regulation power in an embodiment of the present application;

[0049] Figure 2 Flow chart of another method for improving the contribution rate of primary frequency regulation power in an embodiment of the present application;

[0050] Figure 3 Structural schematic diagram of a device for improving the contribution rate of primary frequency regulation power in an embodiment of the present application;

[0051] Figure 4 Structural schematic diagram of another device for improving the contribution rate of primary frequency regulation power in an embodiment of the present application. Detailed implementation manners

[0052] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0053] The core of the present application is to provide a method, a device, and a medium for improving the contribution rate of primary frequency regulation power.

[0054] To enable those skilled in the art to better understand the solution of the present application, the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0055] Figure 1 Flow chart of a method for improving the contribution rate of primary frequency regulation power in an embodiment of the present application. Primary frequency regulation refers to an automatic control process in which once the frequency of the power grid deviates from the rated value, the control system of the units in the power grid automatically controls the increase and decrease of the active power of the units, restricts the change of the power grid frequency, and maintains the stability of the power grid frequency. It can be understood that the units of wind power generation, thermal power generation, and hydropower generation all need to have the ability of primary frequency regulation. An important index for examining the primary frequency regulation ability of the units is the contribution rate of power, that is, the ratio of the actual contributed power of the units during the frequency regulation process to the theoretical contributed power. Generally, it is required that the contribution rate of power is not less than 75%. The method for improving the contribution rate of primary frequency regulation power in this embodiment is mainly applied to thermal power units. It should be noted that the application of the method for improving the contribution rate of primary frequency regulation power in this embodiment to thermal power units does not limit the application scenario of the method in this embodiment, and it can also be applied to wind power units and hydropower units. This embodiment is only a preferred embodiment. As Figure 1 shown, the method for improving the contribution rate of primary frequency regulation power includes:

[0056] S10: Obtain the actual frequency of the generating unit.

[0057] S11: Determine whether the first frequency deviation is within a preset range, where the first frequency deviation is the difference between the actual frequency and the rated frequency; if not, proceed to step S12.

[0058] S12: Obtain the theoretical load adjustment amount, target load value, actual load value, theoretical contribution power, and actual contribution power during the primary frequency regulation of the generator set; where the target load value is the preset load value of the generator set.

[0059] S13: Obtain the first correction amount based on the target load value and the actual load value.

[0060] S14: Obtain the second correction amount based on the theoretical contribution power and the actual contribution power; where the first correction amount and the second correction amount represent the correction amounts for the load adjustment of the generator set.

[0061] S15: Obtain the actual load adjustment amount based on the theoretical load adjustment amount, the first correction amount, and the second correction amount for adjusting the load of the generator set.

[0062] It can be understood that the method for improving the power contribution rate in this embodiment is applied to the primary frequency regulation of thermal power units. Therefore, it is first necessary to determine whether the unit is in primary frequency regulation. Specifically, obtain the actual frequency of the generator unit and determine whether the first frequency deviation is within the preset range; where the first frequency deviation is the difference between the actual frequency and the rated frequency. The actual frequency is the current frequency of the generator set, and the rated frequency is the grid rated frequency of 50 Hz. The preset range here is the dead zone range of the primary frequency regulation. For thermal power units, the preset range, i.e., the dead zone of the primary frequency regulation, generally takes ±0.033 Hz. It should be noted that the dead zones of the primary frequency regulation of wind power units and hydropower units are different from those of thermal power units, and the preset range should also be changed accordingly when the method is applied to the above two types of units.

[0063] In specific implementation, first determine the relationship between the first frequency deviation of the unit and the preset range; when the first frequency deviation is within the preset range, the current actual frequency has not exceeded the dead zone, and a new judgment will be made at the next moment. The next moment here generally refers to 200 ms after this judgment, and it can also be other time values, which are not limited in this embodiment. When the first frequency deviation is not within the preset range, that is, the frequency has exceeded the dead zone, the thermal power unit starts to perform primary frequency regulation. Obtain the theoretical load adjustment amount △P E (t), target load value P sp (t), actual load value P S (t), theoretical contribution power △Q E and actual contribution power △Q S; It should be noted that the load can be understood as the power generation power of the generator set. When the generator set adjusts its load value, it actually adjusts the power generation power of the generator set. When the generator set performs primary frequency modulation, it will adjust the load through the theoretical load adjustment amount △P E (t) to achieve the theoretical contribution power △Q E . However, in the actual frequency modulation process, due to the influence of load changes on frequency modulation, the actual contribution power △Q S of the generator set will be different from the theoretical contribution power △Q E . Therefore, in order to narrow the gap and make the actual contribution power △Q S as close as possible to the theoretical contribution power △Q E , it is necessary to correct the load adjustment amount.

[0064] It should be noted that the target load value P sp (t) is the load value preset for the generator set and is the load value set during primary frequency modulation; the actual load value P S (t) is the load value actually measured during frequency modulation; the theoretical contribution power △Q E is obtained according to the theoretical load adjustment amount △P E (t) during primary frequency modulation. For example, if t A is the starting moment of primary frequency modulation and t B is the ending moment of primary frequency modulation, then the theoretical contribution power △Q E is:

[0065]

[0066] For the acquisition method of the theoretical load adjustment amount △P E (t), it is not limited in this embodiment and depends on the specific implementation situation; if calculating the real-time theoretical contribution power △Q A from the moment t E to the moment t during the frequency modulation process, just replace t B in the above formula with t, that is, the real-time moment; for the acquisition method of the actual contribution power △Q S , it is not limited in this embodiment and depends on the specific implementation situation.

[0067] Specifically, in order to correct the load adjustment amount of the unit during primary frequency modulation, it is necessary to obtain the first correction amount △P1(t) according to the target load value P sp (t) and the actual load value P S (t); the acquisition of the first correction amount △P1(t) is related to the frequency deviation △f(t) considering the dead zone of frequency modulation. For thermal power units, at the moment t during the unit frequency modulation process, if the current actual frequency is f(t) and the rated frequency of the unit is f n, then the calculation formula for the frequency deviation considering the FM dead zone is:

[0068] When f(t) - f n ≥ 0.033 Hz, △f(t) = f(t) - f n - 0.033

[0069] When f(t) - f n ≤ - 0.033 Hz, △f(t) = f(t) - f n + 0.033

[0070] When the change direction of the load itself is opposite to the load change direction required by primary frequency modulation, it is necessary to increase the frequency modulation load adjustment amount to offset the possible reverse change of the load itself; conversely, when the load change directions of the two are the same, no correction is made. When considering that the frequency deviation considering the FM dead zone is less than 0, primary frequency modulation needs to increase the unit load, that is, when △f(t) < 0:

[0071] △P1(t) = max(K1 × (P S (t) - P sp (t)), 0)

[0072] Among them, K1 is the correction coefficient, which is determined according to the unit frequency modulation characteristics. By subtracting the actual load value P S (t) from the target load value P sp (t), multiplying the result by the correction coefficient, and taking the maximum value between the result and 0 as the first correction amount.

[0073] And when considering that the frequency deviation considering the FM dead zone is greater than 0, primary frequency modulation needs to reduce the unit load, that is, when △f(t) > 0:

[0074] △P1(t) = min(K1 × (P S (t) - P sp (t)), 0)

[0075] By subtracting the actual load value P S (t) from the target load value P sp (t), multiplying the result by the correction coefficient, and taking the minimum value between the result and 0 as the first correction amount.

[0076] And the difference between the real-time theoretical contribution power △Q E and the real-time actual contribution power △Q S is used as the feedback to calculate the second correction amount. When the absolute value of the actual contribution power △Q S is less than the theoretical contribution power △Q EWhen the absolute value indicates that the frequency modulation output is insufficient, the frequency modulation load adjustment amount needs to be increased; on the contrary, when the frequency modulation output meets the frequency modulation requirements, no correction is made. When considering that the frequency deviation within the dead band of frequency modulation is less than 0, primary frequency modulation needs to increase the unit load, that is, when △f(t) < 0:

[0077] △P2(t) = max(K2 × (△Q E (t) - △Q S (t)), 0)

[0078] Among them, K2 is the correction coefficient, which is determined according to the unit's frequency modulation characteristics. By taking the difference between the theoretical contribution power △Q E and the actual contribution power △Q S and multiplying by the correction coefficient to obtain the result, taking the maximum value between the result and 0 as the second correction amount.

[0079] When considering that the frequency deviation within the dead band of frequency modulation is greater than 0, primary frequency modulation needs to reduce the unit load, that is, when △f(t) > 0:

[0080] △P2(t) = min(K2 × (△Q E (t) - △Q S (t)), 0)

[0081] By taking the difference between the theoretical contribution power △Q E and the actual contribution power △Q S and multiplying by the correction coefficient to obtain the result, taking the maximum value between the result and 0 as the second correction amount.

[0082] After obtaining the two correction amounts, adding them to the theoretical load adjustment amount △P E (t), the actual load adjustment amount can be obtained:

[0083] △P Em (t) = △P E (t) + △P1(t) + △P2(t)

[0084] Finally, by adjusting the unit load with the obtained actual load adjustment amount △P Em (t), the power contribution rate can be ultimately increased. In this embodiment, the process of specifically adjusting the unit load is not limited and depends on the specific implementation situation.

[0085] In this embodiment, the actual frequency of the generator set is obtained; it is judged whether the first frequency deviation is within a preset range, where the first frequency deviation is the difference between the actual frequency and the rated frequency; if not, the theoretical load adjustment amount, the target load value, the actual load value, the theoretical contribution power and the actual contribution power within the primary frequency regulation time of the generator set are obtained; among them, the target load value is the preset load value of the generator set; a first correction amount is obtained according to the target load value and the actual load value to offset the reverse influence of the load's own change on the frequency regulation process; a second correction amount is obtained according to the actual contribution power and the theoretical contribution power, realizing the feedback control of the power contribution amount, making the actual contribution power as close as possible to the theoretical contribution power, thereby obtaining the actual load adjustment amount and improving the power contribution rate during the primary frequency regulation process.

[0086] Figure 2 It is a flowchart of another method for improving the primary frequency regulation power contribution rate provided by the embodiment of the present application. In the above embodiment, there is no limitation on obtaining the actual contribution power △Q S It depends on the specific implementation situation. In this embodiment, as a preferred embodiment, as Figure 2 shown, obtaining the actual contribution power △Q S includes the following steps:

[0087] S16: Obtain the reference load value of the generator set; among them, the reference load value is set at the start of the primary frequency regulation of the generator set.

[0088] S17: Obtain the actual contribution power according to the reference load value and the actual load value.

[0089] It can be understood that the magnitude of the primary frequency regulation reference load P0 directly affects the calculation result of the actual contribution power. The reference load P0 needs to be set at the start of the primary frequency regulation of the generator set to obtain the actual contribution power △Q S . Specifically, the method for obtaining the actual contribution power △Q S according to the reference load value P0 and the actual load value P S (t) is as follows:

[0090]

[0091] Among them, t A represents the starting moment of the primary frequency regulation. If calculating the real-time actual contribution power △Q A from the moment t S to the moment t during the frequency regulation process, just replace t B in the above formula with t; in this embodiment, there is no limitation on the selection method of the reference load P0, which depends on the specific implementation situation.

[0092] In this embodiment, the reference load value of the generator set is obtained, and the actual contribution power is obtained according to the actual load value, so that the second correction value is obtained through the actual contribution power and the theoretical contribution power to adjust the load of the generator set.

[0093] like Figure 2 As shown, in order to ensure that the reference load value P0 can be obtained during the primary frequency modulation, before obtaining the reference load value of the generator set, that is, before step S16, the following is also included:

[0094] S18: Determine whether the first frequency deviation before the first preset time is within a preset range; if not, proceed to step S16; if yes, proceed to step S19;

[0095] S19: Set the reference load value and proceed to step S16.

[0096] In the above embodiment, it can be seen that the primary frequency modulation reference load P0 is combined with the actual load value P S (t) can obtain the actual contribution power △Q S . Before obtaining the benchmark load value P0, it is also necessary to determine whether the benchmark load value P0 exists. In the specific implementation, before obtaining the benchmark load value P0, it is first determined whether the first frequency deviation before the first preset time is within the preset range, that is, whether the actual frequency before the first preset time exceeds the dead zone range; in order to determine whether the current frequency modulation is the first time. Specifically, if the first frequency deviation before the first preset time is not within the preset range. That is, the actual frequency exceeds the dead zone, it is determined that this is not the first time that the frequency modulation is performed, and the benchmark load value P0 has been set at the beginning of the first frequency modulation, and it can be directly obtained. If the first frequency deviation before the first preset time is within the preset range. That is, the actual frequency does not exceed the dead zone, it is determined that this is the first time that the frequency modulation is performed, and the benchmark load value P0 needs to be set, and then enter the step of obtaining the benchmark load value P0.

[0097] It should be noted that, in this embodiment, the selection of the first preset time is not limited in this embodiment and depends on the specific implementation situation.

[0098] In this embodiment, by judging whether the first frequency deviation is within a preset range before the first preset time, it is determined that the current frequency modulation is being performed for the first time, so that the reference load value is set to obtain the actual contribution power by acquiring the reference load value.

[0099] Based on the above embodiments:

[0100] As a preferred embodiment, setting the reference load value includes:

[0101] When the first frequency deviation is greater than the maximum value of the preset range, set the minimum load value of the generator set within the second preset time before primary frequency modulation as the reference load value;

[0102] When the first frequency deviation is less than the minimum value of the preset range, set the maximum load value of the generator set within the second preset time before primary frequency modulation as the reference load value.

[0103] As can be seen from the above embodiments, the magnitude of the frequency modulation reference load value P0 directly affects the calculation result of the actual contribution power ΔQ S In order to improve the power contribution rate, considering the influence of load fluctuations on the selection of the reference load, select the maximum (when the frequency deviation exceeds the lower limit of the dead zone) or minimum (when the frequency deviation exceeds the upper limit of the dead zone) load within the second preset time T d before the start of frequency modulation as the primary frequency modulation reference load value P0.

[0104] Specifically, when the first frequency deviation is greater than the maximum value of the preset range, that is, the actual frequency exceeds the upper limit of the dead zone, indicating that the frequency is too high and the unit needs to reduce the load. Select the minimum value of the load within T A before the moment t d as the primary frequency modulation reference load value P0; when the first frequency deviation is less than the minimum value of the preset range, that is, the actual frequency exceeds the lower limit of the dead zone, indicating that the frequency is too low and the unit needs to increase the load. Select the maximum value of the load within T A before the moment t d as the primary frequency modulation reference load value P0. For the magnitude of the second preset time T d there is no limit in this embodiment and it depends on the specific implementation situation; preferably, T d can take 5 s or 10 s.

[0105] In this embodiment, by selecting the maximum (when the frequency deviation exceeds the lower limit of the dead zone) or minimum (when the frequency deviation exceeds the upper limit of the dead zone) load within a period of time before the start of frequency modulation as the frequency modulation reference load, it can be ensured that the final actual contribution power is not lower than the conservative contribution power when the primary frequency modulation process ends, thereby improving the primary frequency modulation power contribution rate of the unit.

[0106] Based on the above embodiments:

[0107] As a preferred embodiment, obtaining the theoretical load adjustment amount includes:

[0108] Obtain the second frequency deviation, and obtain the rated power, rated frequency and speed regulation rate of the generator set;

[0109] Obtain the theoretical load adjustment amount according to the second frequency deviation, rated power, rated frequency and speed regulation rate;

[0110] Wherein, when the difference between the actual frequency and the rated frequency is not less than the maximum value of the preset range, the second frequency deviation is the sum of the difference and the minimum value of the preset range;

[0111] When the difference between the actual frequency and the rated frequency is less than the minimum value of the preset range, the second frequency deviation is the sum of the difference and the maximum value of the preset range.

[0112] In the above embodiment, there is no limitation on the obtaining method of the theoretical load adjustment amount △P E (t), which is determined according to the specific implementation situation. In this embodiment, as a preferred embodiment, first obtain the second frequency deviation, and obtain the rated power P N 、rated frequency f n (i.e., 50 Hz) and speed regulation rate δ; the speed regulation rate δ is the percentage of the difference between the no-load speed and the full-load speed to the rated speed when the steam turbine operates alone. Generally, 5% is taken for thermal power and gas turbine units, and 3% is generally taken for hydroelectric units. The second frequency deviation is the frequency deviation △f(t) considering the dead zone of frequency modulation at time t during the unit frequency modulation process:

[0113] When f(t) - f n ≥0.033 Hz, △f(t) = f(t) - f n - 0.033

[0114] When f(t) - f n ≤ - 0.033 Hz, △f(t) = f(t) - f n + 0.033

[0115] Specifically, according to the second frequency deviation, rated power P N 、rated frequency f n and speed regulation rate δ, the obtaining method of the theoretical load adjustment amount △P E (t) is as follows:

[0116]

[0117] It should be noted that the theoretical load adjustment amount △P E (t) also needs to meet the following conditions:

[0118] |△P E (t)| ≤ K P ×P N

[0119] Where K P represents the maximum load limit of the unit.

[0120] In this embodiment, by obtaining the second frequency deviation and calculating the theoretical load adjustment amount based on the rated power, rated frequency, and speed regulation rate of the generator set, the theoretical adjustment of the unit load is carried out.

[0121] Based on the above embodiment:

[0122] As a preferred embodiment, adjusting the load of the generator set includes:

[0123] Obtaining a valve position adjustment command according to the characteristic relationship between the valve position and the load and the actual load adjustment amount;

[0124] Sending the valve position adjustment command and the actual load adjustment amount to the generator set to adjust the load of the generator set.

[0125] Based on the above embodiment, there is no limitation on the specific adjustment process of the generator set load, which depends on the specific implementation situation. In this embodiment, as a preferred embodiment, when adjusting the generator set load, first, according to the actual load adjustment amount △P Em (t) and the characteristic relationship between the valve position of the regulating valve participating in primary frequency modulation and the load, calculate the valve position adjustment command of this regulating valve. It can be understood that the characteristic relationship between the valve position of the regulating valve and the load is a known corresponding relationship in the process of primary frequency modulation of the unit. When one of the quantities is known, the value of the other quantity can be determined according to the characteristic relationship. Add the obtained valve position adjustment command to the original valve position command of this regulating valve to adjust the gas flow of the steam valve of the steam turbine; and add the actual load adjustment amount △P Em (t) to the command of the unit load, thereby realizing the adjustment of the unit load.

[0126] In this embodiment, the valve position adjustment command of the regulating valve is obtained through the obtained actual load adjustment amount and the characteristic relationship between the valve position of the regulating valve and the load, thereby adjusting the gas flow of the steam valve; at the same time, the unit load is adjusted according to the actual load adjustment amount, realizing the improvement of the contribution rate of primary frequency modulation power.

[0127] As Figure 2 shown, in order to realize the real-time monitoring of the improvement of the contribution rate of primary frequency modulation power, after adjusting the load of the generator set, it further includes:

[0128] Returning to the step of obtaining the actual frequency of the generator set.

[0129] It can be understood that the above embodiment is a complete primary frequency modulation process, and then enter the step of obtaining the actual frequency of the generator set to start the frequency deviation judgment at the next moment until the frequency deviation returns to the dead zone range at time t B moment. So far, from time t A moment to time t BA complete primary frequency regulation process ends at a moment. After that, the actual frequency of the generating unit is continuously obtained to judge the frequency deviation, and wait for the start of the next primary frequency regulation process.

[0130] In this embodiment, after adjusting the load of the generating unit, it returns to the step of obtaining the actual frequency of the generating unit, and judges whether the frequency exceeds the dead zone again after a complete primary frequency regulation process, realizing the real-time monitoring of improving the contribution rate of primary frequency regulation power.

[0131] In the above embodiment, the method for improving the contribution rate of primary frequency regulation power is described in detail. The present application also provides an embodiment corresponding to the device for improving the contribution rate of primary frequency regulation power. It should be noted that the present application describes the embodiments of the device part from two perspectives, one is from the perspective of functional modules, and the other is from the perspective of hardware structure.

[0132] Figure 3 It is a schematic structural diagram of a device for improving the contribution rate of primary frequency regulation power provided by an embodiment of the present application. As Figure 3 shown, the device for improving the contribution rate of primary frequency regulation power includes:

[0133] The first acquisition module 10 is used to acquire the actual frequency of the generating unit.

[0134] The judgment module 11 is used to judge whether the first frequency deviation is within a preset range, where the first frequency deviation is the difference between the actual frequency and the rated frequency; if not, trigger the second acquisition module 12.

[0135] The second acquisition module 12 is used to acquire the theoretical load adjustment amount, target load value, actual load value, theoretical contribution power and actual contribution power within the primary frequency regulation time of the generating unit; wherein, the target load value is the preset load value of the generating unit.

[0136] The third acquisition module 13 is used to acquire the first correction amount according to the target load value and the actual load value.

[0137] The fourth acquisition module 14 is used to acquire the second correction amount according to the theoretical contribution power and the actual contribution power; wherein, the first correction amount and the second correction amount represent the correction amounts for the load adjustment of the generating unit.

[0138] The fifth acquisition module 15 is used to acquire the actual load adjustment amount according to the theoretical load adjustment amount, the first correction amount and the second correction amount, so as to adjust the load of the generating unit.

[0139] Since the embodiments of the device part correspond to the embodiments of the method part, for the embodiments of the device part, please refer to the description of the embodiments of the method part, which will not be elaborated here.

[0140] Figure 4 This is a schematic structural diagram of another device for improving the contribution rate of primary frequency regulation power in the embodiments of this application. As Figure 4 shown, the device for improving the contribution rate of primary frequency regulation power includes:

[0141] A memory 20, configured to store a computer program.

[0142] A processor 21, configured to implement the steps of the method for improving the contribution rate of primary frequency regulation power as mentioned in the above embodiments when executing the computer program.

[0143] The device for improving the contribution rate of primary frequency regulation power provided in this embodiment may include, but is not limited to, a smart phone, a tablet computer, a laptop computer, a desktop computer, etc.

[0144] Among them, the processor 21 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 21 may be implemented in at least one of the following hardware forms: DSP (Digital Signal Processor), FPGA (Field-Programmable Gate Array), PLA (Programmable Logic Array). The processor 21 may also include a main processor and a coprocessor. The main processor is a processor for processing data in the wake state, also known as the CPU (Central Processing Unit); the coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor 21 may integrate a GPU (Graphics Processing Unit), and the GPU is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor 21 may further include an AI (Artificial Intelligence) processor, and the AI processor is used to process computational operations related to machine learning.

[0145] The memory 20 may include one or more computer-readable storage media, which may be non-transitory. The memory 20 may further include high-speed random access memory, as well as non-volatile memory, such as one or more disk storage devices and flash storage devices. In this embodiment, the memory 20 is at least used to store the following computer program 201. After being loaded and executed by the processor 21, the computer program can implement the relevant steps of the method for improving the contribution rate of primary frequency regulation power in any of the foregoing embodiments. In addition, the resources stored in the memory 20 may further include an operating system 202 and data 203, etc., and the storage method may be transient storage or permanent storage. Among them, the operating system 202 may include Windows, Unix, Linux, etc. The data 203 may include, but is not limited to, the data involved in the method for improving the contribution rate of primary frequency regulation power.

[0146] In some embodiments, the device for improving the contribution rate of primary frequency regulation power may further include a display screen 22, an input / output interface 23, a communication interface 24, a power supply 25, and a communication bus 26.

[0147] Those skilled in the art can understand that Figure 4 the structure shown in does not constitute a limitation on the device for improving the contribution rate of primary frequency regulation power, and may include more or fewer components than those shown in the figure.

[0148] Finally, the present application also provides an embodiment corresponding to a computer-readable storage medium. A computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps recorded in the foregoing method embodiment are implemented.

[0149] It can be understood that if the method in the above embodiments is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and executes all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs, etc., which can store program codes.

[0150] The above has introduced in detail a method, device, and medium for improving the contribution rate of primary frequency regulation power. The various embodiments in the specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts among the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of this application, several improvements and modifications can still be made to this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0151] It should also be noted that in this specification, relational 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 actual relationship or order between these entities or operations. Moreover, the term "comprising", "including", or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article, or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article, or device including the said element.

Claims

1. A method for improving the contribution rate of primary frequency regulation power, characterized in that Including: Obtain the actual frequency of the generating unit; Judge whether the first frequency deviation is within a preset range, where the first frequency deviation is the difference between the actual frequency and the rated frequency; If not, obtain the theoretical load adjustment amount, target load value, actual load value, theoretical contribution power, and actual contribution power during the primary frequency regulation time of the generating unit; wherein, the target load value is the preset load value of the generating unit; Obtain a first correction amount according to the target load value and the actual load value; Obtain a second correction amount according to the theoretical contribution power and the actual contribution power; Wherein, the first correction amount and the second correction amount represent the correction amounts for the load adjustment of the generating unit; Obtain the actual load adjustment amount according to the theoretical load adjustment amount, the first correction amount, and the second correction amount, so as to adjust the load of the generating unit; Obtaining the theoretical load adjustment amount includes: Obtain a second frequency deviation, and obtain the rated power, rated frequency, and speed regulation rate of the generating unit; Obtain the theoretical load adjustment amount according to the second frequency deviation, the rated power, the rated frequency, and the speed regulation rate; Wherein, when the difference between the actual frequency and the rated frequency is not less than the maximum value of the preset range, the second frequency deviation is the sum of the difference and the minimum value of the preset range; When the difference between the actual frequency and the rated frequency is less than the minimum value of the preset range, the second frequency deviation is the sum of the difference and the maximum value of the preset range.

2. The method for improving the contribution rate of primary frequency regulation power according to claim 1, wherein Obtaining the actual contribution power includes: Obtain the reference load value of the generating unit; wherein, the reference load value is set at the start of the primary frequency regulation of the generating unit; Obtain the actual contribution power according to the reference load value and the actual load value.

3. The method for improving the contribution rate of primary frequency regulation power according to claim 2, wherein Before obtaining the reference load value of the generating unit, it further includes: Judge whether the first frequency deviation was within the preset range before the first preset time; If not, enter the step of obtaining the reference load value of the generating unit; If so, set the reference load value and enter the step of obtaining the reference load value of the generating unit.

4. The method for increasing the contribution rate of primary frequency regulation power according to claim 3, characterized in that, The setting of the reference load value includes: When the first frequency deviation is greater than the maximum value of the preset range, set the minimum load value of the generating unit within the second preset time before primary frequency regulation as the reference load value; When the first frequency deviation is less than the minimum value of the preset range, set the maximum load value of the generating unit within the second preset time before primary frequency regulation as the reference load value.

5. The method for improving the contribution rate of primary frequency regulation power according to claim 1, wherein Adjusting the load of the generating unit includes: Obtain a valve position adjustment command according to the characteristic relationship between the valve position and the load and the actual load adjustment amount; Send the valve position adjustment command and the actual load adjustment amount to the generating unit to adjust the load of the generating unit.

6. The method for improving the contribution rate of primary frequency regulation power according to any one of claims 1 to 5, characterized in that After adjusting the load of the generating unit, it further includes: Return to the step of obtaining the actual frequency of the generating unit.

7. A device for improving the contribution rate of primary frequency regulation power, characterized in that, Including: A first acquisition module for obtaining the actual frequency of the generating unit; A judgment module, configured to judge whether a first frequency deviation is within a preset range, where the first frequency deviation is the difference between the actual frequency and the rated frequency; if not, trigger a second acquisition module; The second acquisition module is configured to acquire a theoretical load adjustment amount, a target load value, an actual load value, a theoretical contribution power amount, and an actual contribution power amount during the primary frequency modulation of the generator set; wherein, the target load value is the load value preset for the generator set; A third acquisition module, configured to acquire a first correction amount according to the target load value and the actual load value; A fourth acquisition module, configured to acquire a second correction amount according to the theoretical contribution power amount and the actual contribution power amount; wherein, the first correction amount and the second correction amount represent correction amounts for the load adjustment of the generator set; A fifth acquisition module, configured to acquire an actual load adjustment amount according to the theoretical load adjustment amount, the first correction amount, and the second correction amount, so as to adjust the load of the generator set; The second acquisition module is specifically configured to acquire a second frequency deviation, and acquire the rated power, the rated frequency, and the speed regulation rate of the generator set; acquire the theoretical load adjustment amount according to the second frequency deviation, the rated power, the rated frequency, and the speed regulation rate; wherein, when the difference between the actual frequency and the rated frequency is not less than the maximum value of the preset range, the second frequency deviation is the sum of the difference and the minimum value of the preset range; when the difference between the actual frequency and the rated frequency is less than the minimum value of the preset range, the second frequency deviation is the sum of the difference and the maximum value of the preset range.

8. A device for improving the contribution rate of primary frequency regulation power, characterized in that Comprising: A memory, configured to store a computer program; A processor, configured to implement the steps of the method for improving the contribution rate of primary frequency modulation power as described in any one of claims 1 to 6 when executing the computer program.

9. A computer-readable storage medium, characterized in that, A computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method for improving the contribution rate of primary frequency modulation power as described in any one of claims 1 to 6 are implemented.

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