Energy storage capacity determination method and device based on multi-region frequency modulation, equipment and medium

Abstract

The invention discloses an energy storage capacity determination method, device and equipment based on multi-region frequency modulation and a medium, and relates to the technical field of power grid frequency adjustment. The method comprises the steps of obtaining an abnormal region frequency and other region frequencies in the multi-control region system under the condition that the multi-control region system has disturbance power, and determining a target steady-state frequency according to the abnormal region frequency, a preset frequency deviation standard frequency and a preset frequency drift limit; determining an abnormal frequency deviation and other frequency deviations according to the abnormal region frequency, the other region frequencies and the target steady-state frequency; and determining the frequency deviation power of each control region according to the abnormal frequency deviation, other frequency deviation, a preset frequency drift limit and the frequency deviation constant of each control region, and determining the energy storage capacity of each control region based on the frequency deviation power. Accurate determination of the energy storage capacity of the control area in the frequency modulation process is realized; meanwhile, by setting the preset frequency drift limit, the flexibility of frequency adjustment is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid frequency regulation, and in particular to a method, device, equipment and medium for determining energy storage based on multi-region frequency regulation. Background Art

[0002] For decades, researchers have been interested in renewable energy resources (RER) for environmental reasons. With the recent technological advances in this field, the levelized cost of renewable energy production has become economically competitive with conventional technologies, and renewable energy will contribute a significant portion of total power generation in the coming years. The variability of most RERs poses some well-known operational challenges. Other challenges of RER integration include reducing system inertia, frequency regulation capacity, cross-mission capacity violations, reserve requirements, voltage instability, and small signal instability.

[0003] Frequency is considered to be one of the main indicators of power system stability. By balancing power generation and load, the frequency is maintained at a fixed value for a long time. The limits of frequency deviation and regional control error must be met by load standards. However, the increasing penetration of low-inertia renewable energy has posed challenges to frequency stability. In order to solve the problems associated with renewable energy, many solutions have been applied, such as energy storage, virtual synchronous generators, virtual energy storage (VES) systems, improved energy storage system control, etc., which makes it suitable for assisting the integration of RER into the main power grid, but the control effect on frequency is not ideal. At present, molten salt thermal energy storage has the advantages of large energy storage scale, high energy storage density, and high safety performance. The whole process does not produce pollution emissions and is very popular, but it is impossible to flexibly determine the storage capacity for multi-regional frequency modulation. Therefore, how to use molten salt thermal energy storage to improve the new energy absorption capacity of the power grid, stabilize the frequency of the power grid, and accurately determine the storage capacity for multi-regional control system frequency modulation has become a problem that needs to be solved urgently. Summary of the invention

[0004] The present invention provides a method, device, equipment and medium for determining energy storage capacity based on multi-region frequency modulation, so as to solve the problem that in the prior art, molten salt heat storage and energy storage are used to improve the new energy absorption capacity of the power grid, but the energy storage capacity of multi-region frequency modulation cannot be accurately determined.

[0005] According to one aspect of the present invention, a method for determining energy storage capacity based on multi-region frequency modulation is provided, wherein the method comprises:

[0006] In the case where there is disturbance power in the multi-control area system, the abnormal area frequency and other area frequencies in the multi-control area system are obtained, and the target steady-state frequency is determined according to the abnormal area frequency, the deviation of the preset frequency from the standard frequency, and the preset frequency drift limit;

[0007] Determine abnormal frequency deviation and other frequency deviations according to the abnormal area frequency, the other area frequencies and the target steady-state frequency;

[0008] The frequency deviation power of each control area is determined according to the abnormal frequency deviation, the other frequency deviations, the preset frequency drift limit and the frequency offset constant of each control area, and the energy storage capacity of each control area is determined based on the frequency deviation power.

[0009] According to another aspect of the present invention, a device for determining energy storage based on multi-region frequency modulation is provided, wherein the device comprises:

[0010] A frequency determination module, used for obtaining abnormal area frequencies and other area frequencies in the multi-control area system when there is disturbance power in the multi-control area system, and determining a target steady-state frequency according to the abnormal area frequency, the deviation of a preset frequency from a standard frequency, and a preset frequency drift limit;

[0011] A deviation determination module, used to determine abnormal frequency deviation and other frequency deviations according to the abnormal area frequency, the other area frequencies and the target steady-state frequency;

[0012] The energy storage determination module is used to determine the frequency deviation power of each control area according to the abnormal frequency deviation, the other frequency deviations, the preset frequency drift limit and the frequency offset constant of each control area, and determine the energy storage capacity of each control area based on the frequency deviation power.

[0013] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0014] at least one processor; and

[0015] a memory communicatively connected to the at least one processor; wherein,

[0016] The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute a method for determining energy storage based on multi-region frequency modulation as described in any embodiment of the present invention.

[0017] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement a method for determining energy storage capacity based on multi-region frequency modulation as described in any embodiment of the present invention when executed.

[0018] The technical solution of the embodiment of the present invention obtains the abnormal area frequency and other area frequencies in the multi-control area system when there is disturbance power in the multi-control area system, determines the target steady-state frequency according to the abnormal area frequency, the preset frequency deviation from the standard frequency and the preset frequency drift limit, determines the frequency deviation power of each control area according to the abnormal frequency deviation, other frequency deviations, the preset frequency drift limit and the frequency offset constant of each control area, determines the energy storage capacity of each control area based on the frequency deviation power, and realizes accurate determination of the energy storage capacity of each control area in the process of using molten salt heat storage and energy storage to participate in frequency modulation; at the same time, by setting the preset frequency drift limit, the flexibility of frequency regulation of the multi-control area system is guaranteed.

[0019] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 is a flow chart of a method for determining energy storage capacity based on multi-region frequency modulation according to Embodiment 1 of the present invention;

[0022] Figure 2 This is a schematic diagram of a structure of a multi-control area system provided according to Embodiment 1 of the present invention;

[0023] Figure 3 is a flow chart of a method for determining energy storage capacity based on multi-region frequency modulation according to Embodiment 2 of the present invention;

[0024] Figure 4 is a structural schematic diagram of a preset load frequency control model provided according to Embodiment 3 of the present invention;

[0025] Figure 5 is a structural schematic diagram of a device for determining energy storage based on multi-region frequency modulation according to a fourth embodiment of the present invention;

[0026] Figure 6 It is a structural schematic diagram of an electronic device for implementing a method for determining energy storage capacity based on multi-region frequency modulation according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] Embodiment 1

[0030] Figure 1 This is a flow chart of a method for determining energy storage based on multi-region frequency modulation according to the first embodiment of the present invention. This embodiment can be applied to the situation where molten salt thermal energy storage is used to determine the energy storage of multi-region frequency modulation after a large number of new energy sources are connected to the power grid. The method can be executed by an energy storage determination device based on multi-region frequency modulation. The energy storage determination device based on multi-region frequency modulation can be implemented in the form of hardware and / or software. The energy storage determination device based on multi-region frequency modulation can be configured in an electronic device. Figure 1 As shown, the method includes:

[0031] S110. In the case where a disturbance power exists in the multi-control area system, the frequency of the abnormal area and other area frequencies in the multi-control area system are obtained, and the target steady-state frequency is determined according to the frequency of the abnormal area, the deviation of the preset frequency from the standard frequency, and the preset frequency drift limit.

[0032] The multi-control area system refers to a system that divides a large power grid into multiple control areas, each of which has an independent control center for management and regulation, and each control area can help stabilize other control areas. Figure 2 1 is a schematic diagram of a structure of a multi-control area system provided according to the first embodiment of the present invention. Figure 2 As shown, it is a multi-control area system composed of 3 control areas, each of which is connected by a connecting line. At the same time, each control area is equipped with an independent control center, which is responsible for the grid operation monitoring, dispatching control, safety and stability analysis, etc. in the control area to ensure the stable operation of each control area. In the actual operation process, when the load of control area 1 decreases, the frequency of the multi-control area system increases. The regional frequency of control area 1 can be assisted by the regional frequency of control area 2 and control area 3. The difference between the energy consumed by each area when the preset frequency deviates from the standard frequency and the preset frequency drift pole is the energy stored in the control area.

[0033] The disturbance power can be understood as the power change that occurs in the multi-control area system and affects the stability of the system. In one embodiment, the disturbance power can be caused by the absorption or consumption of rotational kinetic energy in the traditional generator, the transformer failure or the generator failure. The abnormal area frequency can be understood as the regional frequency corresponding to the control area where the disturbance power is generated, and the other regional frequencies can be understood as the regional frequencies of other control areas other than the control area where the disturbance power is generated. The preset frequency deviation from the standard frequency refers to the frequency that is pre-set in the multi-control area system and is allowed to deviate. For example, the preset frequency deviation from the standard frequency can include but is not limited to 50Hz, 55Hz or 60Hz, etc., and can be set based on the power grid demand. The preset frequency drift limit can be understood as the limit of allowing the frequency to drift up and down based on the preset frequency deviation from the standard frequency, which can improve the flexibility of the power grid frequency regulation. For example, the preset frequency drift limit can be set according to the power grid demand. For example, the preset frequency drift limit can include but is not limited to 1Hz, 2Hz or 3Hz, etc.

[0034] In an embodiment, the regional frequencies of the multi-control region system can be monitored in real time. When it is determined that the multi-control region system has a disturbance power, the regional frequencies of each control region are determined, and the regional frequencies corresponding to the regional frequencies with the disturbance power are used as abnormal regional frequencies, and the regional frequencies corresponding to other regional frequencies are used as other regional frequencies. Then, the difference between the abnormal regional frequency and the preset frequency deviating from the standard frequency is determined, and a method for determining the target steady-state frequency is selected based on the difference. In summary of the actual operation process, when it is determined that the difference is greater than the preset frequency drift limit, the target steady-state frequency can be determined as the sum of the preset frequency deviation from the standard frequency and the preset frequency drift limit; when it is determined that the difference is less than the inverse of the preset frequency drift limit, the target steady-state frequency can be determined as the difference between the preset frequency deviation from the standard frequency and the preset frequency drift limit; when it is determined that the frequency of the abnormal area is less than the preset frequency drift limit and greater than the inverse of the preset frequency drift limit, the load damping coefficient of the control area where the disturbance power exists can be extracted, and the ratio of the disturbance power to the load damping coefficient of the control area where the disturbance power exists can be determined, and the difference between the preset frequency deviation from the standard frequency and the ratio is used as the target steady-state frequency, so as to reasonably determine the target steady-state frequency according to the difference between the frequency of the abnormal area and the preset frequency deviation from the standard frequency.

[0035] S120, determining abnormal frequency deviation and other frequency deviations according to the abnormal area frequency, other area frequencies and the target steady-state frequency.

[0036] Among them, the abnormal frequency deviation can be understood as the frequency deviation of the control area with disturbance power after and before regional frequency modulation, that is, the frequency change of the area; other frequency deviations can be understood as the frequency deviation of the control area with disturbance power after and before regional frequency modulation, that is, the frequency change of other areas.

[0037] In an embodiment, after determining the abnormal region frequency, other region frequencies and target steady-state frequency, the difference between the abnormal region frequency and the target steady-state frequency can be determined as the abnormal frequency deviation; the difference between the other region frequency and the target steady-state frequency can be determined as the other frequency deviation.

[0038] S130, determining the frequency deviation power of each control area according to the abnormal frequency deviation, other frequency deviations, the preset frequency drift limit and the frequency offset constant of each control area, and determining the energy storage capacity of each control area based on the frequency deviation power.

[0039] Among them, the frequency offset constant is a parameter used to describe the degree of frequency offset. Generally speaking, the frequency offset constant is the ratio of abnormal frequency deviation and other frequency deviation to a certain reference quantity. In the actual operation process, after renewable energy is connected to the multi-control area system of the power grid, the renewable energy is intermittent, and certain types of renewable energy generation can provide partial inertia to support the power grid by occupying some advanced control standards. However, this partial inertia is limited by the available output and the type of renewable energy generator. When renewable energy gradually replaces traditional generators, the total system inertia decreases, while the equivalent regulation constant increases. This leads to a decrease in the regional frequency response characteristics. It can be determined that the partial inertia contributed by renewable energy to the power grid and the inertia reduced due to replacing conventional power generation determine the frequency offset constant after the access to renewable energy. The frequency deviation power can be understood as the deviation power generated by the influence of the preset frequency drift limit. For example, if the partial inertia contributed by renewable energy to the power grid is r w , then the inertia reduced by replacing conventional power generation is r r , then the new inertia constant is H i =H old,i (1+r w -r r ), where H old,i is the inertia constant of the control area i without adding renewable energy; due to the existence of renewable energy, the equivalent regulation constant will also be affected, Among them, R old,i is the equivalent regulation constant of the i control area without adding renewable energy; due to the increase of the equivalent regulation constant, the updated regional frequency response characteristics are as follows Among them, D i is the load damping constant of the i control area.

[0040] In the embodiment, the magnitude relationship between the abnormal frequency deviation and other frequency deviations and the preset frequency drift limit is determined, and the frequency offset constant of each control area is determined. When the frequency of the abnormal area is greater than the preset frequency drift limit, the frequency deviation power is determined to be the product of the preset frequency drift limit and the frequency offset constant of the control area corresponding to the abnormal frequency deviation, and the time integral of the frequency deviation power is used as the energy storage of the control area; when the frequency of the abnormal area is less than the inverse of the preset frequency drift limit, the inverse of the product of the preset frequency drift limit and the frequency offset constant of the control area corresponding to the abnormal frequency deviation is used as the frequency deviation power, and the time integral of the frequency deviation power is used as the energy storage of the control area; when the frequency of the abnormal area is less than the preset frequency drift limit and greater than the inverse of the preset frequency drift limit, the product of the abnormal frequency deviation and the frequency offset constant of the control area corresponding to the abnormal frequency deviation is determined, and the product is used as the frequency deviation power, and the time integral of the frequency deviation power is used as the energy storage of the control area.

[0041] Similarly, when the frequency of other areas is greater than the preset frequency drift limit, the frequency deviation power can be determined as the product of the preset frequency drift limit and the frequency offset constant of the control area corresponding to the other frequency deviation, and the time integral of the frequency deviation power is used as the energy storage capacity of the control area; when the frequency of other areas is less than the inverse of the preset frequency drift limit, the inverse of the product of the preset frequency drift limit and the frequency offset constant of the control area corresponding to the other frequency deviation can be used as the frequency deviation power, and the time integral of the frequency deviation power is used as the energy storage capacity of the control area; when the frequency of other areas is less than the preset frequency drift limit and greater than the inverse of the preset frequency drift limit, the product of the other frequency deviation and the frequency offset constant of the control area corresponding to the other frequency deviation is determined, the product is used as the frequency deviation power, and the time integral of the frequency deviation power is used as the energy storage capacity of the control area.

[0042] In an embodiment of the present invention, when there is disturbance power in the multi-control area system, the frequency of the abnormal area and other area frequencies in the multi-control area system are obtained, the target steady-state frequency is determined according to the frequency of the abnormal area, the deviation of the preset frequency from the standard frequency and the preset frequency drift limit, the frequency deviation power of each control area is determined according to the abnormal frequency deviation, other frequency deviations, the preset frequency drift limit and the frequency offset constant of each control area, the energy storage capacity of each control area is determined based on the frequency deviation power, and the accurate determination of the energy storage capacity of each control area in the process of using molten salt heat storage and energy storage to participate in frequency modulation is achieved; at the same time, by setting the preset frequency drift limit, the flexibility of frequency regulation of the multi-control area system is guaranteed.

[0043] In one embodiment, the method for determining energy storage capacity based on multi-region frequency modulation further includes:

[0044] Obtaining the tie line power deviation of each control area, the current energy storage capacity of each control area, the frequency offset constant of each control area, and the current regional frequency of each control area;

[0045] Determine the regional control error according to the target steady-state frequency, the frequency offset constant, the current regional frequency, the preset frequency drift limit and the tie line power deviation;

[0046] Determine the power to be adjusted based on the regional control error and the current energy storage capacity;

[0047] Based on the power to be adjusted, each control area in the multi-control area system is adjusted to the target steady-state frequency through a preset load frequency control model.

[0048] Among them, the interconnection line power deviation refers to the deviation between the interconnection line power at the current moment and the preset interconnection line power threshold value of the power transmitted on the interconnection line connecting two different control areas; the current regional frequency may include abnormal regional frequency and other regional frequencies; the current energy storage refers to the energy storage situation of each control area at the current moment; the power to be adjusted refers to the power required after removing the current energy storage of the control area, which is used to adjust the power of generators, loads and other equipment to control the regional frequency; the regional control error is an important indicator for measuring the control performance of the regional power grid, and the regional control error may include frequency difference and interconnection line power deviation. The preset load frequency control model can be a pre-constructed model for regional frequency regulation. In one embodiment, the preset load frequency control model includes at least: a turbine governor and a load frequency control controller.

[0049] In an embodiment, the tie-line power of each control area can be monitored in real time by the power monitoring system, the difference between the tie-line power and the preset tie-line power threshold can be determined, the difference can be used as the tie-line power deviation, and the current energy storage capacity of each control area, the frequency bias constant of each control area, and the current regional frequency of each control area can be determined. The regional control error is determined by the target steady-state frequency, the frequency bias constant, the current regional frequency, the preset frequency drift limit, and the tie-line power deviation, and the difference between the regional control error and the current energy storage capacity is used as the power to be adjusted, and the frequency of each control area in the multi-control area system is adjusted to the target steady-state frequency by the preset load frequency control model. In the actual operation process, the power to be adjusted can be distributed to m turbine governors through the load frequency control controller of the preset load frequency control model, first adjusted by the regulator, that is, the equivalent adjustment coefficient, and the data is output to the turbine governor after adjustment, and the adjustment output is summed, and the rotating mass and load damping are adjusted, and finally the target steady-state frequency is obtained. In one embodiment, the preset load frequency control model action consists of four main stages: inertial response, primary control, secondary control, and tertiary control. Among them, the kinetic energy of the rotating mass during the inertial response is immediately discharged or absorbed by the synchronous generator to resist the change in frequency. Primary control is called in the first few seconds after the disturbance, relying on governor action and load damping to stabilize the frequency. Once the governors sense the frequency deviation, they adjust the output of the generator accordingly by adjusting the input of the prime mover. On the other hand, load damping is the speed change of the motor load proportional to the frequency deviation, which helps to resist frequency disturbances by changing the power consumption of the motor load. The purpose of secondary control is to further stabilize the frequency through automatic generation control (AGC). AGC determines the most practical output of each generator based on regional control errors and economic dispatch, and then changes the governor set value accordingly. Tertiary control is the final level of frequency control. Its purpose is to restore the reserve for secondary control after the completion of secondary control. The generator is rescheduled for future supervision. Tertiary control is not automatic. It is performed according to the requirements of the grid operator. This application is to perform frequency regulation actions using a preset load frequency control model.

[0050] In one embodiment, determining the regional control error according to the target steady-state frequency, the frequency offset constant, the current regional frequency, the preset frequency drift limit, and the tie line power deviation includes:

[0051] Determine the difference between the current region frequency and the target steady-state frequency as the frequency difference;

[0052] When it is determined that the frequency difference is greater than the preset frequency drift limit, the difference between the frequency difference and the preset frequency drift limit is determined as the first difference, the product of the first difference and the frequency offset constant of the control area is determined as the first product, and the difference between the tie line power deviation and the first product is used as the area control error;

[0053] When it is determined that the frequency difference is less than the inverse of the preset frequency drift limit, the sum of the frequency difference and the preset frequency drift limit is determined as a first sum, the product of the first sum and the frequency offset constant of the control area is determined as a second product, and the difference between the tie line power deviation and the second product is used as the area control error;

[0054] When it is determined that the frequency difference is less than the preset frequency drift limit and greater than the inverse of the preset frequency drift limit, the tie line power deviation is determined as the regional control error.

[0055] The frequency difference refers to the difference between the current region frequency and the target steady-state frequency, that is, the adjustment value of the current region deviation.

[0056] In an embodiment, the difference between the current regional frequency and the target steady-state frequency can be determined as the frequency difference, and the determination strategy of the regional control error can be determined according to the magnitude relationship between the frequency difference and the preset frequency drift limit. In the actual operation process, when it is determined that the frequency difference is greater than the preset frequency drift limit, the difference between the frequency difference and the preset frequency drift limit can be determined as the first difference, and then the product of the first difference and the frequency bias constant of the control area is determined as the first product, and the difference of the tie line power deviation minus the first product is used as the regional control error; when it is determined that the frequency difference is less than the opposite of the preset frequency drift limit, the sum of the frequency difference and the preset frequency drift limit can be determined as the first sum, and then the product of the first sum and the frequency bias constant of the control area is determined as the second product, and the difference between the tie line power deviation and the second product is used as the regional control error; when it is determined that the frequency difference is less than the preset frequency drift limit and greater than the opposite of the preset frequency drift limit, the tie line power deviation is determined as the regional control error. A strategy for determining the regional control error according to the frequency difference and the preset frequency drift limit is implemented to ensure the accuracy of the regional control error.

[0057] Embodiment 2

[0058] Figure 3 1 is a flow chart of a method for determining energy storage based on multi-region frequency modulation according to Embodiment 2 of the present invention. This embodiment is a further description of a method for determining energy storage based on multi-region frequency modulation based on the above embodiment. Figure 2 As shown, the method includes:

[0059] S201. In the case where disturbance power exists in a multi-control area system, obtain abnormal area frequencies and other area frequencies in the multi-control area system.

[0060] S202: Determine the difference between the abnormal area frequency and the preset frequency and the standard frequency.

[0061] In an embodiment, after it is determined that the abnormal region frequency deviates from the preset frequency from the standard frequency, a difference between the abnormal region frequency and the preset frequency deviating from the standard frequency may be determined.

[0062] S203: When it is determined that the difference is greater than the preset frequency drift limit, determine the target steady-state frequency as the sum of the preset frequency deviation from the standard frequency and the preset frequency drift limit.

[0063] In an embodiment, after determining the difference, the magnitude relationship between the difference and the preset frequency drift limit can be determined to determine whether the difference belongs to a certain threshold interval. When the difference is greater than the preset frequency drift limit, the sum of the preset frequency deviation from the standard frequency and the preset frequency drift limit can be determined, and the sum is taken as the target steady-state frequency. Exemplarily, when the preset frequency drift limit is 0.2, if the difference is 0.3, the target steady-state frequency can be determined to be the sum of the preset frequency deviation from the standard frequency and the preset frequency drift limit.

[0064] S204: When it is determined that the difference is less than the inverse of the preset frequency drift limit, determine the target steady-state frequency as the difference between the preset frequency deviation from the standard frequency and the preset frequency drift limit.

[0065] In an embodiment, when each difference is less than the inverse of the preset frequency drift limit, the difference between the preset frequency deviation from the standard frequency and the preset frequency drift limit can be determined, and the difference is used as the target steady-state frequency. Exemplarily, when the preset frequency drift limit is 0.2, if the difference is -0.3, it can be determined that the inverse of the preset frequency drift limit is -0.2. At this time, the target steady-state frequency can be determined to be the sum of the preset frequency deviation from the standard frequency and the preset frequency drift limit.

[0066] S205. When it is determined that the frequency of the abnormal area is less than the preset frequency drift limit and greater than the inverse of the preset frequency drift limit, determine the ratio of the disturbance power to the load damping coefficient of the control area where the disturbance power exists, and use the difference between the preset frequency deviation from the standard frequency and the ratio as the target steady-state frequency.

[0067] The load damping coefficient refers to the proportional relationship between the resistance generated by various damping factors and the load movement speed in the system. Generally speaking, the load damping coefficient is related to the inertia time constant and the turbine governor parameters.

[0068] In an embodiment, when the frequency of the abnormal region is less than the preset frequency drift limit and greater than the opposite of the preset frequency drift limit, the damping coefficient of the control region where the disturbance power exists can be determined, and after determining the ratio of the disturbance power to the damping coefficient, the difference between the preset frequency and the standard frequency minus the ratio is determined as the target steady-state frequency. For example, when the preset frequency drift limit is 0.2, if the difference is -0.1, it can be determined that the opposite of the preset frequency drift limit is -0.2, and the ratio of the disturbance power to the damping coefficient of the control region where the disturbance power exists is Among them, ΔP L,i is the disturbance power of the i control area, D i is the load damping coefficient of the i control area.

[0069] S206: Determine the difference between the abnormal region frequency and the target steady-state frequency as the abnormal frequency deviation.

[0070] In an embodiment, the difference between the frequency of the abnormal region and the target steady-state frequency may be determined, and the difference may be used as the abnormal frequency deviation, that is, the frequency variation of the region.

[0071] S207: Determine the difference between the frequency of other regions and the target steady-state frequency as other frequency deviations.

[0072] In an embodiment, the difference between the frequency of other regions and the target steady-state frequency may be determined, and the difference may be used as the other frequency deviation, that is, the frequency variation of the region.

[0073] S208: Determine the magnitude relationship between the abnormal frequency deviation / other frequency deviation and the preset frequency drift limit, and extract the frequency offset constant of each control area.

[0074] In an embodiment, the magnitude relationships between the abnormal frequency deviation and other frequency deviations and the preset frequency drift limit may be determined respectively, and the frequency offset constant of each control area may be determined.

[0075] S209: When the abnormal region frequency / other frequency deviation is greater than the preset frequency drift limit, determine the frequency deviation power as the product of the preset frequency drift limit and the frequency offset constant of the control region corresponding to the abnormal frequency deviation / other frequency deviation.

[0076] In an embodiment, when it is determined that the frequency of the abnormal area is greater than the preset frequency drift limit, the product of the preset frequency drift limit and the frequency offset constant of the control area corresponding to the abnormal frequency deviation can be determined, and the product is used as the frequency deviation power; when it is determined that the frequency of other areas is greater than the preset frequency drift limit, the product of the preset frequency drift limit and the frequency offset constant of the control area corresponding to the other frequency deviations can be determined, and the product is used as the frequency deviation power.

[0077] S210. When the abnormal frequency deviation / other frequency deviation is less than the inverse of the preset frequency drift limit, determine the frequency deviation power as the inverse of the product of the preset frequency drift limit and the frequency offset constant of the control area corresponding to the abnormal frequency deviation / other frequency deviation.

[0078] In an embodiment, when the abnormal frequency deviation is less than the inverse of the preset frequency drift limit, the product of the preset frequency drift limit and the frequency offset constant of the control area corresponding to the abnormal frequency deviation can be determined, and the inverse of the product is determined as the frequency deviation power. When other frequency deviations are less than the inverse of the preset frequency drift limit, the product of the preset frequency drift limit and the frequency offset constant of the control area corresponding to the other frequency deviations can be determined, and the inverse of the product is determined as the frequency deviation power.

[0079] S211. When the abnormal frequency deviation / other frequency deviation is less than the preset frequency drift limit and greater than the inverse of the preset frequency drift limit, determine the frequency deviation power as the product of the abnormal frequency deviation / other frequency deviation and the frequency offset constant of the control area corresponding to the abnormal frequency deviation / other frequency deviation.

[0080] In an embodiment, when the abnormal frequency deviation is less than the preset frequency drift limit and greater than the inverse of the preset frequency drift limit, the product of the abnormal frequency deviation and the frequency offset constant of the control area corresponding to the abnormal frequency deviation can be used as the frequency deviation power; correspondingly, when other frequency deviations are less than the preset frequency drift limit and greater than the inverse of the preset frequency drift limit, the product of other frequency deviations and the frequency offset constant of the control area corresponding to other frequency deviations can be used as the frequency deviation power.

[0081] S212, determining the time integral of the frequency deviation power as the energy storage capacity of the control area.

[0082] In an embodiment, after the frequency deviation power is determined, the integral of the frequency deviation power within a period of time may be determined as the energy storage capacity of the control area during the period of time. In actual operation, the energy storage capacity may be a positive number, a negative number, or zero.

[0083] According to an embodiment of the present invention, when there is disturbance power in a multi-control area system, the frequency of an abnormal area and other area frequencies in the multi-control area system are obtained, the difference between the abnormal area frequency and the preset frequency and the standard frequency is determined, and a calculation method of a target steady-state frequency is determined according to a size relationship between the difference and a preset frequency drift limit, thereby ensuring the rationality of the determination of the target steady-state frequency; by determining the difference between the abnormal area frequency and the target steady-state frequency as the abnormal frequency deviation, determining the difference between the frequencies of other areas and the target steady-state frequency as other frequency deviations, determining a method for determining the frequency deviation power according to a size relationship between the abnormal frequency deviation, other frequency deviations and the preset frequency drift limit, and then determining the time integral of the frequency deviation power as the energy storage amount of the control area, thereby ensuring the accuracy of the energy storage amount.

[0084] Embodiment 3

[0085] Figure 4 is a schematic diagram of a structure of a preset load frequency control model provided according to the third embodiment of the present invention. Figure 4 As shown in the figure, the preset load frequency control model is the load frequency control (LFC) model, which is applied to Figure 2 The multi-control zone system shown in FIG. A dead zone is embedded in the preset load frequency control model to allow for frequency drift. The parameters of the described LFC model are as follows:

[0086] ΔP C is a supplementary control; ΔP P is the primary control power; K(s) is the LFC controller; ΔP load It is a non-frequency sensitive load change; ΔP L is the disturbance power; T ij is the synchronous torque coefficient between area i and area j; T ji is the synchronous torque coefficient between area j and area i; H is the equivalent inertia constant of area i; Δf is the abnormal frequency deviation; D i is the load damping constant; G Tki (s) is the turbine speed governor; Tg is the time constant; T t is the time delay of the turbine model; ΔP tie,i is the power transmission between control area i and other areas through the connecting line (interconnection line power); β i is the frequency deviation factor (frequency offset constant) of control region i; It's a regulator.

[0087] Assuming that the generator in the LFC model includes a no-reheat turbine and a reheat turbine, the turbine governor dynamics model is expressed as:

[0088]

[0089] in, It is the non-reheat turbine governor dynamics model; is the reheat turbine governor dynamics model; T t,i is the time delay of the turbine model; T g,i is the time constant of the turbine model; T HF,i is the time constant of the turbine no longer being heated; T RH,i is the time constant of the reheat turbine.

[0090] The dynamic model for the state space control region i in the LFC model, including the steam turbine generator in the presence of wind power generation, can be presented as follows:

[0091] in, It is the non-reheat turbine governor dynamics model; is the reheat turbine governor dynamics model; T t,i is the time delay of the turbine model; T g,i is the time constant of the turbine model.

[0092] The state space of the LFC dynamic model for control area i, including the reheat steam turbine generator in the presence of wind power, can be shown as follows:

[0093]

[0094] y i =D i x i +Im i ;

[0095] Based on this formula, the frequency deviation and the energy storage capacity of the control area can be determined.

[0096] Where: x i =[Df i ΔP ti ΔP gi ΔP tie,i ΔP RHi ] T , ΔP RHi is the intermediate thermal power signal, Δf i is the frequency deviation of control area i; ΔP ti is the load power; ΔP gi is the generator power; ΔP tie,i It is the amount of power transmitted between control area i and other areas through connecting lines (interconnection line power).

[0097] ΔP ti =[DPt1i ΔP t2i ...ΔP tmi ];

[0098] ΔP gi =[DP g1i ΔP g2i ...ΔP gmi ];

[0099] ΔP RHi =[DP RH1i ΔP RH2i ...ΔP RHmi ];

[0100] y i =[Df i ACE i ] T ;

[0101] u i =[DP C1i ΔP C2i ...ΔP Cmi ε] T ;

[0102] n i Represents the external input matrix, including frequency changes and load changes;

[0103] m i =[0-εβ] T ;

[0104] A i ,B i ,C i ,D i The four matrices are represented as follows:

[0105]

[0106] Among them, the four matrices Ai, Bi, Ci, and Di are all derived from the parameters of the LFC model.

[0107] The state variables of the non-reheat turbine are similar to those of the reheat turbine and are related to ΔP RHi The dead zone will filter the frequency deviation generated when a load disturbance occurs. The filtered frequency deviation and the tie line power signal are captured as feedback in the control system to generate the Area Control Error (ACE).

[0108] The filter frequency deviation is determined according to the following dead zone mathematical model:

[0109]

[0110] Among them, -ε is the lower limit of the dead zone (the opposite of the preset frequency drift limit), ε is the upper limit of the dead zone (the preset frequency drift limit), and u is the filter frequency deviation, that is, the output signal of the dead zone. Finally, under the regulation of the LFC model, the target steady-state deviation frequency is:

[0111]

[0112] Where Δf i,ss is the target steady-state deviation frequency, which is the sum of the target steady-state frequency and the preset frequency deviation from the standard frequency; ΔP L,i is the disturbance power of the i control area, D i is the load damping coefficient of the i control area; when the frequency deviation exceeds the upper drift limit, it will eventually adjust to the upper drift limit in steady state. When the frequency deviation is lower than the lower drift limit, it will eventually adjust to the lower drift limit in steady state. It means that for the case where the frequency deviation is within the drift limit, it will eventually stabilize the target steady-state deviation frequency to

[0113] In the actual operation process, the full-cycle integral calculation of the frequency deviation is the output power used to adjust the frequency, and then the energy storage power is subtracted to obtain ACE. The power to be adjusted can be distributed to m turbine governors through the load frequency control controller of the preset load frequency control model. First, it is adjusted through the regulator, that is, the equivalent adjustment coefficient. After adjustment, the data is output to the turbine governor, the adjustment output is summed, the rotating mass and load damping are adjusted, and finally the target steady-state frequency is obtained.

[0114] Among them, after controlling the system, ACE and frequency drift limit ε of area i, the energy storage can be expressed as follows:

[0115]

[0116] f i,a is the current actual frequency of control area i; f i,s is the nominal frequency (the preset frequency deviates from the standard frequency); B i is the frequency offset constant of control area i, unit: MW / 0.1Hz; E i is the capacity of energy storage in control area i; ACE i The regional control error of control area i. When the actual frequency of control area i is lower (or higher) than the predetermined frequency, the energy storage of control area i is discharged (or charged).

[0117] Embodiment 4

[0118] Figure 5Schematic diagram of a device for determining energy storage based on multi-region frequency modulation according to Embodiment 4 of the present invention. Figure 5 As shown, the device includes: a frequency determination module 51, a deviation determination module 52 and an energy storage determination module 53.

[0119] Among them, the frequency determination module 51 is used to obtain the abnormal area frequency and other area frequencies in the multi-control area system when there is disturbance power in the multi-control area system, and determine the target steady-state frequency according to the abnormal area frequency, the deviation of the preset frequency from the standard frequency and the preset frequency drift limit.

[0120] The deviation determination module 52 is used to determine abnormal frequency deviation and other frequency deviations according to the abnormal area frequency, other area frequencies and the target steady-state frequency.

[0121] The energy storage determination module 53 is used to determine the frequency deviation power of each control area according to abnormal frequency deviation, other frequency deviations, preset frequency drift limit and the frequency offset constant of each control area, and determine the energy storage capacity of each control area based on the frequency deviation power.

[0122] In an embodiment of the present invention, when a disturbance power exists in a multi-control area system, a frequency determination module is used to obtain the frequency of an abnormal area and other area frequencies in the multi-control area system; a deviation determination module determines a target steady-state frequency according to the frequency of the abnormal area, a preset frequency deviation from a standard frequency, and a preset frequency drift limit; an energy storage determination module determines the frequency deviation power of each control area according to the abnormal frequency deviation, other frequency deviations, a preset frequency drift limit, and a frequency offset constant of each control area; and the energy storage capacity of each control area is determined based on the frequency deviation power, thereby realizing accurate determination of the energy storage capacity of each control area in the process of utilizing molten salt heat storage and energy storage to participate in frequency modulation; at the same time, by setting a preset frequency drift limit, the flexibility of frequency regulation of the multi-control area system is ensured.

[0123] In one embodiment, a device for determining energy storage based on multi-region frequency modulation further includes:

[0124] A regional frequency determination module is used to obtain the tie line power deviation of each control area, the current energy storage capacity of each control area, the frequency offset constant of each control area, and the current regional frequency of each control area;

[0125] An error determination module, for determining a regional control error according to a target steady-state frequency, a frequency offset constant, a current regional frequency, a preset frequency drift limit, and a tie line power deviation;

[0126] The power determination module is used to determine the power to be adjusted based on the regional control error and the current energy storage;

[0127] The frequency adjustment module is used to adjust the frequency of each control area in the multi-control area system to a target steady-state frequency through a preset load frequency control model based on the power to be adjusted.

[0128] In one embodiment, the frequency determination module 51 includes:

[0129] A difference determination unit, used to determine the difference between the abnormal area frequency and the preset frequency and the standard frequency;

[0130] A first difference judgment unit, configured to determine, when it is determined that the difference is greater than a preset frequency drift limit, that the target steady-state frequency is the sum of a preset frequency deviation from a standard frequency and a preset frequency drift limit;

[0131] A second difference judgment unit is used to determine the target steady-state frequency as the difference between the preset frequency deviation from the standard frequency and the preset frequency drift limit when the difference is determined to be less than the inverse of the preset frequency drift limit;

[0132] The third difference judgment unit is used to determine the ratio of the disturbance power to the load damping coefficient of the control area where the disturbance power exists when it is determined that the frequency of the abnormal area is less than the preset frequency drift limit and greater than the inverse of the preset frequency drift limit, and take the difference between the preset frequency deviation from the standard frequency and the ratio as the target steady-state frequency.

[0133] In one embodiment, the deviation determination module 52 includes:

[0134] A first deviation determination unit, used to determine a difference between the abnormal region frequency and the target steady-state frequency as an abnormal frequency deviation;

[0135] The second deviation determining unit is used to determine the difference between the frequency of other regions and the target steady-state frequency as the other frequency deviation.

[0136] In one embodiment, the energy storage determination module 53 includes:

[0137] A constant extraction unit, used to determine the magnitude relationship between the abnormal frequency deviation / other frequency deviation and the preset frequency drift limit, and to extract the frequency offset constant of each control area;

[0138] A first deviation determination unit, for determining the frequency deviation power as the product of the preset frequency drift limit and the frequency offset constant of the control area corresponding to the abnormal frequency deviation / other frequency deviation when the abnormal area frequency / other frequency deviation is greater than the preset frequency drift limit;

[0139] A second deviation determination unit, for determining the frequency deviation power as the inverse of the product of the preset frequency drift limit and the frequency offset constant of the control area corresponding to the abnormal frequency deviation / other frequency deviation when the abnormal frequency deviation / other frequency deviation is less than the inverse of the preset frequency drift limit;

[0140] A third deviation determination unit, configured to determine, when the abnormal frequency deviation / other frequency deviation is less than a preset frequency drift limit and greater than the inverse of the preset frequency drift limit, the frequency deviation power as the product of the abnormal frequency deviation / other frequency deviation and the frequency offset constant of the control area corresponding to the abnormal frequency deviation / other frequency deviation;

[0141] The energy storage determining unit is used to determine the time integral of the frequency deviation power as the energy storage of the control area.

[0142] In one embodiment, the preset load frequency control model at least includes: a turbine speed governor and a load frequency control controller.

[0143] In one embodiment, the error determination module is specifically configured to:

[0144] Determine the difference between the current region frequency and the target steady-state frequency as the frequency difference;

[0145] When it is determined that the frequency difference is greater than the preset frequency drift limit, the difference between the frequency difference and the preset frequency drift limit is determined as the first difference, the product of the first difference and the frequency offset constant of the control area is determined as the first product, and the difference between the tie line power deviation and the first product is used as the area control error;

[0146] When it is determined that the frequency difference is less than the inverse of the preset frequency drift limit, the sum of the frequency difference and the preset frequency drift limit is determined as a first sum, the product of the first sum and the frequency offset constant of the control area is determined as a second product, and the difference between the tie line power deviation and the second product is used as the area control error;

[0147] When it is determined that the frequency difference is less than the preset frequency drift limit and greater than the inverse of the preset frequency drift limit, the tie line power deviation is determined as the regional control error.

[0148] The energy storage determination device based on multi-region frequency modulation provided in the embodiment of the present invention can execute the energy storage determination method based on multi-region frequency modulation provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0149] Embodiment 5

[0150] Figure 6It is a structural schematic diagram of an electronic device for implementing a method for determining energy storage based on multi-region frequency modulation according to an embodiment of the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0151] like Figure 6 As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0152] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0153] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as a method for determining energy storage based on multi-region frequency modulation.

[0154] In some embodiments, a method for determining energy storage based on multi-regional frequency modulation may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the method for determining energy storage based on multi-regional frequency modulation described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform a method for determining energy storage based on multi-regional frequency modulation in any other appropriate manner (e.g., by means of firmware).

[0155] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0156] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0157] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0158] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0159] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0160] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0161] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0162] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for determining energy storage capacity based on multi-region frequency modulation, characterized in that: include: In the case where there is disturbance power in the multi-control area system, the abnormal area frequency and other area frequencies in the multi-control area system are obtained, and the target steady-state frequency is determined according to the abnormal area frequency, the deviation of the preset frequency from the standard frequency, and the preset frequency drift limit; Determine abnormal frequency deviation and other frequency deviations according to the abnormal area frequency, the other area frequencies and the target steady-state frequency; The frequency deviation power of each control area is determined according to the abnormal frequency deviation, the other frequency deviations, the preset frequency drift limit and the frequency offset constant of each control area, and the energy storage capacity of each control area is determined based on the frequency deviation power.

2. The method according to claim 1, characterized in that The method further comprises: Obtaining the tie line power deviation of each control area, the current energy storage capacity of each control area, the frequency offset constant of each control area, and the current regional frequency of each control area; Determining a regional control error according to the target steady-state frequency, the frequency offset constant, the current regional frequency, the preset frequency drift limit, and the tie line power deviation; Determine the power to be adjusted based on the regional control error and the current amount of stored energy; Based on the power to be adjusted, each control area in the multi-control area system is frequency-adjusted to a target steady-state frequency through a preset load frequency control model.

3. The method according to claim 1, characterized in that: The step of determining the target steady-state frequency according to the abnormal region frequency, the deviation of the preset frequency from the standard frequency, and the preset frequency drift limit includes: Determine the difference between the abnormal area frequency and the preset frequency and the standard frequency; When it is determined that the difference is greater than the preset frequency drift limit, determining the target steady-state frequency as the sum of the preset frequency deviation from the standard frequency and the preset frequency drift limit; When it is determined that the difference is less than the inverse of the preset frequency drift limit, determining the target steady-state frequency as the difference between the preset frequency deviation from the standard frequency and the preset frequency drift limit; When it is determined that the frequency of the abnormal area is less than the preset frequency drift limit and greater than the inverse of the preset frequency drift limit, the ratio of the disturbance power to the load damping coefficient of the control area where the disturbance power exists is determined, and the difference between the preset frequency deviation from the standard frequency and the ratio is used as the target steady-state frequency.

4. The method according to claim 1, characterized in that: The determining of abnormal frequency deviation and other frequency deviations according to the abnormal region frequency, the other region frequencies and the target steady-state frequency includes: Determine a difference between the abnormal region frequency and the target steady-state frequency as an abnormal frequency deviation; A difference between the other region frequency and the target steady-state frequency is determined as the other frequency deviation.

5. The method according to claim 1, characterized in that The method of determining the frequency deviation power of each control area according to the abnormal frequency deviation, the other frequency deviations, the preset frequency drift limit and the frequency offset constant of each control area, and determining the energy storage capacity of each control area based on the frequency deviation power includes: Determine the magnitude relationship between the abnormal frequency deviation / the other frequency deviation and the preset frequency drift limit, and extract the frequency offset constant of each control area; When the abnormal region frequency / the other frequency deviation is greater than the preset frequency drift limit, determining the frequency deviation power as the product of the preset frequency drift limit and the frequency offset constant of the control region corresponding to the abnormal frequency deviation / the other frequency deviation; When the abnormal frequency deviation / the other frequency deviation is less than the inverse of the preset frequency drift limit, determining the frequency deviation power as the inverse of the product of the preset frequency drift limit and the frequency offset constant of the control area corresponding to the abnormal frequency deviation / the other frequency deviation; When the abnormal frequency deviation / the other frequency deviation is less than the preset frequency drift limit and greater than the inverse of the preset frequency drift limit, determining the frequency deviation power as the product of the abnormal frequency deviation / the other frequency deviation and the frequency offset constant of the control area corresponding to the abnormal frequency deviation / the other frequency deviation; The time integral of the frequency deviation power is determined as the energy storage capacity of the control area.

6. The method according to claim 1, characterized in that The preset load frequency control model at least includes: a turbine speed governor and a load frequency control controller.

7. The method according to claim 2, characterized in that The determining of the regional control error according to the target steady-state frequency, the frequency offset constant, the current regional frequency, the preset frequency drift limit and the tie line power deviation includes: Determine a difference between the current region frequency and the target steady-state frequency as a frequency difference; When it is determined that the frequency difference is greater than the preset frequency drift limit, the difference between the frequency difference and the preset frequency drift limit is determined as a first difference, the product of the first difference and the frequency offset constant of the control area is determined as a first product, and the difference between the tie line power deviation and the first product is used as a regional control error; When it is determined that the frequency difference is less than the inverse of a preset frequency drift limit, determining the sum of the frequency difference and the preset frequency drift limit as a first sum, determining the product of the first sum and the frequency offset constant of the control area as a second product, and taking the difference between the tie line power deviation and the second product as an area control error; When it is determined that the frequency difference is smaller than the preset frequency drift limit and larger than the inverse of the preset frequency drift limit, the tie line power deviation is determined as the regional control error.

8. A device for determining energy storage capacity based on multi-region frequency modulation, characterized in that: include: A frequency determination module, used for obtaining the abnormal area frequency and other area frequencies in the multi-control area system when there is disturbance power in the multi-control area system, and determining the target steady-state frequency according to the abnormal area frequency, the deviation of the preset frequency from the standard frequency, and the preset frequency drift limit; A deviation determination module, used for determining abnormal frequency deviation and other frequency deviations according to the abnormal area frequency, the other area frequencies and the target steady-state frequency; The energy storage determination module is used to determine the frequency deviation power of each control area according to the abnormal frequency deviation, the other frequency deviations, the preset frequency drift limit and the frequency offset constant of each control area, and determine the energy storage capacity of each control area based on the frequency deviation power.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute a method for determining energy storage based on multi-region frequency modulation as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement a method for determining energy storage capacity based on multi-region frequency modulation according to any one of claims 1 to 7 when executed.

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