Power distribution method and device for flywheel energy storage participating in primary frequency modulation, terminal and storage medium

Abstract

The application provides a power distribution method and device for flywheel energy storage participating in primary frequency modulation, a terminal and a storage medium. The method comprises the following steps: determining the basic distribution power and frequency modulation time of each flywheel energy storage unit based on the residual energy of the flywheel energy storage unit in the flywheel energy storage array and the frequency modulation power; regarding the flywheel energy storage unit with the basic distribution power less than the minimum power limit value in the flywheel energy storage array as a second flywheel energy storage unit and eliminating the second flywheel energy storage unit; regarding the flywheel energy storage unit with the basic distribution power greater than the maximum power limit value in the updated flywheel energy storage array as a third flywheel energy storage unit, regarding the maximum power limit value as the distribution power of each third flywheel energy storage unit, and eliminating the third flywheel energy storage unit; and determining the distribution power of each flywheel energy storage unit in the updated flywheel energy storage array. The application ensures that each flywheel energy storage unit operates in a reasonable power range by dynamically adjusting the power distribution, prevents equipment damage caused by overload, and improves the overall frequency modulation efficiency.

Description

Technical Field

[0001] This invention relates to the field of flywheel energy storage technology, and in particular to a power distribution method, device, terminal and storage medium for flywheel energy storage participating in primary frequency regulation. Background Technology

[0002] Flywheel energy storage is an electromechanical energy conversion and storage technology that uses a high-speed rotating flywheel rotor to convert electrical energy into kinetic energy for storage, and then converts the kinetic energy back into electrical energy for output when needed by decelerating.

[0003] In power systems, flywheel energy storage is particularly suitable for primary frequency regulation, i.e., rapid power compensation when the grid frequency fluctuates due to imbalances in generation and load. As the first line of defense for frequency control, flywheel energy storage effectively smooths out random fluctuations in new energy sources through high-frequency, short-duration charging and discharging, alleviates equipment wear and energy efficiency degradation in thermal power units caused by frequency regulation, and significantly improves grid stability.

[0004] However, in current frequency regulation practices, a fixed-time frequency regulation control strategy is usually adopted for all flywheel energy storage devices. This approach is very likely to cause overload of flywheel energy storage devices, accelerate equipment wear, shorten service life, and even cause failures. Summary of the Invention

[0005] This invention provides a power allocation method, device, terminal, and storage medium for flywheel energy storage participating in primary frequency regulation, in order to solve the problem of overload damage of flywheel energy storage when participating in primary frequency regulation in the prior art.

[0006] In a first aspect, embodiments of the present invention provide a power allocation method for flywheel energy storage participating in primary frequency regulation, comprising:

[0007] Obtain the frequency modulation power carried by the frequency modulation power command;

[0008] Based on the remaining energy of the flywheel energy storage units in the flywheel energy storage array and the frequency modulation power, the basic allocated power and frequency modulation time of each flywheel energy storage unit are determined;

[0009] The flywheel energy storage unit in the flywheel energy storage array whose basic allocated power is less than the minimum power limit is designated as the second flywheel energy storage unit; the second flywheel energy storage unit is removed from the flywheel energy storage array.

[0010] In the updated flywheel energy storage array, flywheel energy storage units with a basic allocated power greater than the maximum power limit are designated as third flywheel energy storage units, and the maximum power limit is used as the allocated power of each third flywheel energy storage unit. The third flywheel energy storage units are then removed from the flywheel energy storage array.

[0011] Determine the allocated power for each flywheel energy storage unit in the updated flywheel energy storage array.

[0012] Secondly, embodiments of the present invention provide a power distribution device for flywheel energy storage participating in primary frequency regulation, comprising:

[0013] The frequency modulation power acquisition module is used to acquire the frequency modulation power carried by the frequency modulation power command;

[0014] The basic allocation module is used to determine the basic allocation power and frequency modulation time of each flywheel energy storage unit based on the remaining energy of the flywheel energy storage units in the flywheel energy storage array and the frequency modulation power.

[0015] The low-power flywheel rejection module is used to designate flywheel energy storage units in the flywheel energy storage array whose basic allocated power is less than the minimum power limit as second flywheel energy storage units; and to reject the second flywheel energy storage units from the flywheel energy storage array.

[0016] A high-power flywheel limiting module is used to designate flywheel energy storage units in the updated flywheel energy storage array whose basic allocated power is greater than the maximum power limit as third flywheel energy storage units, and to use the maximum power limit as the allocated power of each third flywheel energy storage unit, thereby removing the third flywheel energy storage unit from the flywheel energy storage array.

[0017] The secondary power allocation module is used to determine the allocated power for each flywheel energy storage unit in the updated flywheel energy storage array.

[0018] Thirdly, embodiments of the present invention provide a terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the power allocation method for flywheel energy storage participating in primary frequency regulation as described in any possible implementation of the first aspect above.

[0019] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the power allocation method for flywheel energy storage participating in primary frequency regulation as described in any possible implementation of the first aspect above.

[0020] This invention provides a power allocation method, apparatus, terminal, and storage medium for flywheel energy storage participating in primary frequency regulation. The method determines the base allocation power and frequency regulation time for each flywheel energy storage unit based on its remaining energy and frequency regulation power in the flywheel energy storage array. Then, flywheel energy storage units in the array with base allocation power less than a minimum power limit are designated as second flywheel energy storage units. These second flywheel energy storage units are then removed from the array. Next, flywheel energy storage units in the updated array with base allocation power greater than a maximum power limit are designated as third flywheel energy storage units, and the maximum power limit is used as the allocation power for each third flywheel energy storage unit. These third flywheel energy storage units are then removed from the array. Finally, the allocation power for each flywheel energy storage unit in the updated array is determined. This embodiment dynamically adjusts the power allocation to ensure that each flywheel energy storage unit operates within a reasonable power range, preventing equipment damage due to overload and improving overall frequency regulation efficiency. In addition, this method can optimize the output of the remaining flywheel energy storage units, further improve the accuracy of frequency regulation response, enable the flywheel energy storage array to participate in grid frequency regulation more evenly, extend equipment life and reduce operation and maintenance costs. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a flowchart illustrating the implementation of the power allocation method for flywheel energy storage participating in primary frequency regulation provided in this embodiment of the invention.

[0023] Figure 2 This is a schematic diagram of the structure of the power distribution device for flywheel energy storage participating in primary frequency regulation provided in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the terminal provided in an embodiment of the present invention. Detailed Implementation

[0025] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0026] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0027] Primary frequency regulation refers to the adjustment process in a power system used for rapid response to frequency deviations, stabilizing the system frequency by adjusting generation or load power. When flywheel energy storage units participate in primary frequency regulation, traditional strategies use a fixed power allocation ratio. When the grid frequency fluctuates continuously, some flywheel energy storage units, due to their higher allocation weights, frequently output full power. For example, a flywheel energy storage unit might be forced to discharge even when its State of Charge (SOC) is below 20%, causing its energy to be depleted in a short time and triggering overload protection shutdown. After the overloaded unit exits, the remaining units must momentarily bear additional power, creating a chain reaction. Conversely, if the frequency deviation is small, a fixed strategy may keep the flywheel units in a low-load state for extended periods, failing to fully utilize their rapid response potential and resulting in wasted frequency regulation resources.

[0028] To avoid the above problems, this embodiment provides a power allocation method for flywheel energy storage to participate in primary frequency regulation. The execution subject of this method can be the control terminal of the flywheel energy storage system. The flywheel energy storage system includes a flywheel energy storage array, which includes multiple flywheel energy storage units connected in parallel. Each flywheel energy storage unit can be connected to the power grid through a grid-connected inverter after being connected in parallel, and participate in the primary frequency regulation of the power grid.

[0029] See Figure 1 The diagram illustrates the implementation flowchart of the power allocation method for flywheel energy storage participating in primary frequency regulation provided by an embodiment of the present invention, which is described in detail below:

[0030] S101: Obtain the frequency modulation power carried by the frequency modulation power command.

[0031] Specifically, the frequency regulation power command is issued by the power system control center, carrying the required frequency regulation power. When the frequency regulation power value is positive, the flywheel energy storage unit needs to perform a discharge operation to provide power support to the grid in response to a decrease in grid frequency; when the frequency regulation power value is negative, the flywheel energy storage unit needs to perform a charging operation to absorb excess power from the grid in response to an increase in grid frequency.

[0032] S102: Based on the remaining energy of the flywheel energy storage units in the flywheel energy storage array and the frequency modulation power, determine the basic allocated power and frequency modulation time of each flywheel energy storage unit.

[0033] In this embodiment, the control terminal combines the remaining energy of each flywheel energy storage unit in the flywheel energy storage array with the acquired frequency modulation power to determine the basic allocated power of each flywheel energy storage unit and the frequency modulation time required for this frequency modulation, so that the initial power allocation can take into account the energy reserve of each flywheel energy storage unit.

[0034] Specifically, the control terminal first determines the charging and discharging state of the flywheel energy storage array based on the frequency modulation power carried in the power frequency modulation command. Then, based on the charging / discharging state and the remaining energy of each flywheel energy storage unit, it determines the basic allocated power and frequency modulation time of each flywheel energy storage unit.

[0035] Before determining the base power allocation and frequency modulation time, the method provided in this embodiment further includes:

[0036] The flywheel energy storage unit in the flywheel energy storage array whose schedulable energy is less than a first preset energy is designated as the first flywheel energy storage unit; the first flywheel energy storage unit is removed from the flywheel energy storage array; wherein, in the charging state, the schedulable energy is the difference between the full-scale energy and the remaining energy of the flywheel energy storage unit, and in the discharging state, the schedulable energy is the remaining energy of the flywheel energy storage unit.

[0037] Specifically, when the flywheel energy storage unit needs to discharge to provide power support to the grid, the control terminal monitors the remaining energy of each flywheel energy storage unit and determines whether the remaining energy is less than a first preset energy. If the remaining energy is less than the first preset energy, the flywheel energy storage unit is designated as the first flywheel energy storage unit and removed from the grid. When the flywheel energy storage unit needs to charge to absorb excess power from the grid, the control terminal monitors the rechargeable energy of each flywheel energy storage unit, which is the value of full-scale energy minus the remaining energy. Then, the flywheel energy storage unit with rechargeable energy less than the first preset energy is designated as the first flywheel energy storage unit and removed from the grid.

[0038] In this embodiment, the first preset energy can be adaptively adjusted based on the frequency modulation power. The larger the absolute value of the frequency modulation power, the larger the first preset energy; the smaller the absolute value of the frequency modulation power, the smaller the first preset energy.

[0039] Specifically, the remaining energy mentioned in this embodiment can be the SOC value, and the first preset energy can be 5% to 15%.

[0040] As can be seen from the above embodiments, in traditional fixed-time frequency regulation strategies, if flywheel energy storage units with nearly depleted energy are still forced to participate in frequency regulation, they may rapidly enter a deep discharge / overcharge state, accelerating equipment aging or even causing failure. This embodiment can ensure the continuous stability of primary frequency regulation, avoiding situations where the flywheel energy storage units participating in frequency regulation are unable to continue providing or absorbing power due to insufficient dispatchable energy, preventing frequency regulation interruptions from causing aggravated grid frequency fluctuations, ensuring the continuous and stable completion of the primary frequency regulation task, and maintaining the stable operation of the grid frequency. Secondly, the method provided in this embodiment can also improve the effectiveness and rationality of power allocation. After removing flywheel energy storage units with insufficient energy, when determining the basic allocation power and frequency regulation time based on the remaining energy and frequency regulation power, it is no longer necessary to consider the impact of these energy-deficient units, reducing invalid power allocation calculations, and making the preliminary allocation results more consistent with the actual energy carrying capacity of each flywheel energy storage unit. This lays a good foundation for further optimization of power allocation and avoids the problem of overall power allocation imbalance caused by the presence of energy-deficient units, which could lead to increased losses due to excessively low power in some units or risks of exceeding limits due to excessively high power.

[0041] In one possible implementation, the specific implementation process of S102 includes:

[0042] According to the formula Determine the base power allocation for each flywheel energy storage unit;

[0043] According to the formula Determine the frequency modulation time;

[0044] in, Indicates the first i The basic power distribution of each flywheel energy storage unit in the discharge state. Indicates the first i Dispatchable energy of each flywheel energy storage unit; This indicates the frequency modulation power. N This indicates the number of flywheel energy storage units in the flywheel energy storage array; t The frequency modulation time is indicated; wherein, in the charging state, the schedulable energy is the difference between the full-scale energy and the remaining energy of the flywheel energy storage unit, and in the discharging state, the schedulable energy is the remaining energy of the flywheel energy storage unit.

[0045] Specifically, the implementation process of S102 above includes:

[0046] In the discharge state, according to the formula Determine the base power allocation for each flywheel energy storage unit;

[0047] According to the formula Determine the frequency modulation time;

[0048] in, Indicates the first i The basic power distribution of each flywheel energy storage unit in the discharge state. Indicates the first i The remaining energy of each flywheel energy storage unit; This indicates the frequency modulation power. N This indicates the number of flywheel energy storage units in the flywheel energy storage array; t This indicates the frequency modulation time.

[0049] Specifically, during discharge, the base power allocation is distributed according to the proportion of remaining energy in each flywheel energy storage unit, ensuring a more balanced remaining energy distribution among the flywheel energy storage units after power frequency regulation. The frequency regulation time is determined by the ratio of total remaining energy to total frequency regulation power, reflecting the time the system can continuously provide frequency regulation power.

[0050] In this embodiment, when calculating the remaining energy of each flywheel energy storage unit, the control terminal can determine the weight of the flywheel energy storage unit based on its service life, then multiply its remaining energy by the weight to obtain the actual remaining energy of the flywheel energy storage unit, and finally calculate the aforementioned frequency regulation time and basic power allocation based on the actual remaining energy. The service life of the flywheel energy storage unit is negatively correlated with its weight; that is, the longer the service life, the smaller the weight.

[0051] Specifically, it can be based on the formula ;in, n Indicates the service life. Indicates weight, This represents the benchmark weight, which is usually 1. k The unit value can be 0.01 to 0.05.

[0052] In this embodiment, after calculating the frequency modulation time, the control terminal can also adjust the frequency modulation time based on the frequency change trend of the power grid. If the difference between the power grid frequency and the rated power grid frequency continues to increase, the frequency modulation time is extended to ensure that frequency fluctuations are adequately suppressed; if the difference between the power grid frequency and the rated power grid frequency continues to decrease, the frequency modulation time is appropriately shortened to avoid unnecessary energy consumption.

[0053] In one possible implementation, during the charging state, according to the formula Determine the base power allocation for each flywheel energy storage unit;

[0054] According to the formula Determine the frequency modulation time;

[0055] in, Indicates the firsti The basic power distribution of each flywheel energy storage unit in the discharge state. Indicates the first i The remaining energy of each flywheel energy storage unit; This indicates the frequency modulation power. N This indicates the number of flywheel energy storage units in the flywheel energy storage array; t Indicates the frequency modulation time; E max This indicates the maximum capacity of the flywheel energy storage unit.

[0056] Specifically, during charging, the base power allocation is distributed according to the proportion of rechargeable energy in each flywheel energy storage unit, ensuring a more balanced remaining energy in each flywheel energy storage unit after power frequency regulation. The frequency regulation time is determined by the ratio of total rechargeable energy to total frequency regulation power, reflecting the time the system can continuously absorb frequency regulation power.

[0057] S103: Select the flywheel energy storage unit in the flywheel energy storage array whose basic allocated power is less than the minimum power limit as the second flywheel energy storage unit; remove the second flywheel energy storage unit from the flywheel energy storage array.

[0058] In this embodiment, the control terminal selects the second flywheel energy storage unit whose basic allocated power is less than the minimum power limit and removes it from the array participating in frequency modulation, so as to avoid the increased loss due to frequent switching of flywheel energy storage units caused by excessively low power.

[0059] Specifically, the minimum power limit can be 5% to 15% of the rated power of the flywheel energy storage unit, preferably 10% of the rated power of the flywheel energy storage unit.

[0060] In one possible implementation, prior to S103, the method provided in this embodiment further includes:

[0061] The minimum power limit is determined based on the frequency modulation time; and the frequency modulation time is positively correlated with the minimum power limit.

[0062] In this embodiment, before removing the second flywheel energy storage unit, the minimum power limit is determined based on the predetermined frequency regulation time, and it is clearly stated that the frequency regulation time and the minimum power limit are positively correlated. When the frequency regulation time is long, the flywheel energy storage unit needs to maintain a certain power operation for a longer period of time. If the power is too low, the power of the flywheel energy storage unit will frequently fall below the minimum effective power value and be switched off. Frequent switching operations will significantly increase the loss of the flywheel energy storage device and shorten its service life. Therefore, it is necessary to increase the minimum power limit to ensure that the flywheel energy storage unit operates at a relatively high power during the longer frequency regulation time and reduce equipment loss. When the frequency regulation time is short, even if the power of the flywheel energy storage unit falls to the minimum effective power value and is switched off, the loss generated in a short period of time is within an acceptable range. At this time, the minimum power limit can be appropriately reduced to avoid too many flywheel energy storage units being removed due to the limit being too high, which would affect the satisfaction of the total frequency regulation power. By dynamically determining the minimum power limit based on the frequency regulation time, the minimum power limit setting is made more in line with actual operating requirements. This can effectively avoid the loss problems caused by low power operation, and maximize the preservation of flywheel energy storage units that can participate in frequency regulation, thus ensuring the smooth completion of the frequency regulation task.

[0063] Specifically, the frequency modulation time and the minimum power limit have a positive linear relationship, which can be expressed by the formula... ;in, t This indicates the frequency modulation time, in minutes or hours. Indicates the minimum power limit. This indicates the initial minimum power limit, which can be 3% to 7% of the rated power. j Indicates the unit adjustable power value. j The value can range from 0.5% to 2%.

[0064] In one possible implementation, this embodiment can determine the minimum power limit based on parameters such as frequency modulation time, operating temperature of the flywheel energy storage unit, and degree of aging.

[0065] Specifically, in this embodiment, the minimum power limit is first determined based on the frequency modulation time, and the frequency modulation time and the minimum power limit are positively correlated. After determining the basic minimum power limit, an adjustment coefficient for the minimum power limit is determined based on the operating temperature and aging degree. The operating temperature and adjustment coefficient are negatively correlated. Since a higher minimum power limit reduces the number of power-sharing entities, under the premise that the total frequency regulation power demand of the grid remains unchanged, the remaining flywheel energy storage units can only make up for the total demand by undertaking a larger power share. This requires the remaining flywheel energy storage units to maintain higher power operation. When the operating temperature is high, it indicates that core components such as the flywheel rotor and motor are already in a high-loss state. If the adjustment coefficient is too large at this time, it will lead to a higher minimum power limit, requiring the remaining flywheel energy storage units to continue to maintain higher power operation, further aggravating heat generation, potentially triggering overheat protection shutdown, or even accelerating component aging. Therefore, this embodiment sets the operating temperature and adjustment coefficient to be negatively correlated. When the operating temperature is low, the adjustment coefficient is adjusted to maintain a higher minimum power limit; when the operating temperature is high, the adjustment coefficient is adjusted to reduce the minimum power limit, preventing the temperature of the operating flywheel energy storage units from continuously rising. The operating temperature mentioned in this embodiment can be the average operating temperature of all flywheel energy storage units.

[0066] Secondly, the degree of aging is negatively correlated with the adjustment coefficient. Since a higher minimum power limit requires the remaining flywheel energy storage units to maintain higher operating power, and flywheel energy storage units with greater aging exhibit significantly reduced tolerance to high-power operation, if the adjustment coefficient is too large, resulting in a high minimum power limit, aging flywheel energy storage units will need to maintain high power operation for extended periods. This will further exacerbate mechanical wear and electrical losses, shorten their remaining service life, and may even lead to failure. Low-power operation is safer than high-power operation. Therefore, when the aging degree of flywheel energy storage units is high, the adjustment coefficient can be reduced to lower the minimum power limit, allowing more flywheel energy storage units to participate in frequency regulation and thus reducing the operating power of each individual flywheel energy storage unit. Here, the aging degree can be considered as the average aging degree of all flywheel energy storage units.

[0067] In this embodiment, the aging degree and operating temperature are normalized, and then a weighted summation formula is used. Determine the weighted sum of aging degree and operating temperature, where Q represents the weighted sum, a and b represent the weights, and a + b = 1. A normalized value representing the degree of aging. This represents the normalized value of the operating temperature. A weighted summation is used to determine the corresponding adjustment coefficient, and the weighted summation is negatively correlated with the adjustment coefficient. For example, the weighted summation and adjustment coefficient can be inversely proportional. Alternatively, a formula can be used... ;in, F This represents the adjustment factor corresponding to the current weighted sum value.F 0 represents the initial adjustment factor, and F 0 can be 1; z This represents the unit adjustment value, which can range from 0.1 to 0.5.

[0068] Specifically, the adjustment factor is a value between 0 and 1. The updated minimum power limit is obtained by multiplying the minimum power limit by the adjustment factor.

[0069] As can be seen from the above embodiments, this embodiment can achieve dynamic optimization matching of the minimum power limit, avoiding the problem of unreasonable limits that may occur under different frequency regulation times when using a fixed minimum power limit. When the frequency regulation time is long, increasing the minimum power limit effectively prevents the flywheel energy storage unit from experiencing a significant increase in losses due to prolonged low-power operation, reducing unnecessary wear and tear on the equipment, extending the service life of the flywheel energy storage unit, and reducing equipment maintenance and replacement costs. When the frequency regulation time is short, appropriately reducing the minimum power limit avoids the mistaken elimination of a large number of units that can still effectively participate in frequency regulation in a short time due to an excessively high limit, ensuring that the number of units participating in frequency regulation is sufficient to meet the total frequency regulation power demand, ensuring the smooth operation of the first frequency regulation, and preventing a frequency regulation power gap due to insufficient number of units, which would affect the stability of the power grid frequency.

[0070] S104: Select the flywheel energy storage units in the updated flywheel energy storage array whose basic allocated power is greater than the maximum power limit as the third flywheel energy storage units, and use the maximum power limit as the allocated power of each third flywheel energy storage unit, and remove the third flywheel energy storage units from the flywheel energy storage array.

[0071] In this embodiment, for the updated flywheel energy storage array, a third flywheel energy storage unit with a basic allocated power greater than the maximum power limit is selected. The maximum power limit is set as the allocated power of the third flywheel energy storage unit. That is, the third flywheel energy storage unit is controlled to participate in the primary frequency regulation with the maximum power limit, and they are removed from the flywheel energy storage array to prevent the risk of exceeding the limit due to excessive power.

[0072] Specifically, the maximum power limit can be the rated power of the flywheel energy storage unit.

[0073] In this embodiment, the maximum power limit can be adaptively adjusted based on the frequency modulation time, and the frequency modulation time is negatively correlated with the maximum frequency limit. That is, the longer the frequency modulation time, the smaller the maximum power limit, thus avoiding long-term overload leading to efficiency degradation.

[0074] S105: Determine the allocated power of each flywheel energy storage unit in the updated flywheel energy storage array.

[0075] In this embodiment, the base allocated power of each flywheel energy storage unit in the updated flywheel energy storage array can be used as the final allocated power for charging and discharging operations. Furthermore, if the sum of the base allocated power of each flywheel energy storage unit in the updated flywheel energy storage array is less than the unallocated power, the difference between the unallocated power and the remaining power is allocated to the battery device. The unallocated power is the frequency modulation power minus the sum of the allocated power of all third flywheel energy storage units, and the remaining power is the sum of the allocated power of each flywheel energy storage unit in the updated flywheel energy storage array.

[0076] In one possible implementation, the specific implementation process of S105 includes:

[0077] Based on formula Determine the allocated power of the remaining flywheel energy storage units;

[0078] in, Indicating the updated flywheel energy storage array, the first... j The power distribution of each flywheel energy storage unit Indicates the first j The dispatchable energy of each flywheel energy storage unit; t represents the frequency modulation time;

[0079] In the charging state, the dispatchable energy is the difference between the full-scale energy and the remaining energy of the flywheel energy storage unit; in the discharging state, the dispatchable energy is the remaining energy of the flywheel energy storage unit.

[0080] In this embodiment, if the allocated power determined based on the above formula is greater than the maximum power limit, the maximum power limit is used to restrict the allocated power, and the restricted allocated power is used as the final allocated power of the corresponding flywheel energy storage unit.

[0081] In one possible implementation, after S105, the method provided in this embodiment further includes:

[0082] The sum of the distributed power after limiting of the remaining flywheel energy storage units is calculated as the remaining power;

[0083] If the remaining power is less than the unallocated power, the remaining power is subtracted from the unallocated power to obtain the power borne by the battery system; the unallocated power is the value obtained by subtracting the allocated power from the frequency modulation power; the allocated power is the product of the maximum power limit and the number of third flywheel energy storage units.

[0084] In this embodiment, when the remaining power is greater than or equal to the unallocated power, the flywheel energy storage array is directly used to perform primary frequency regulation of the power grid. If the remaining power is less than the unallocated power, the flywheel energy storage array and battery system are required to perform primary frequency regulation of the power grid.

[0085] This embodiment adopts a collaborative mode with the flywheel as the main component and the battery as the auxiliary component, which not only meets the rapid response requirements of primary frequency regulation, but also solves the problem of short flywheel duration, making it suitable for complex frequency regulation scenarios in the power grid.

[0086] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0087] The following are device embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0088] Figure 2 A schematic diagram of a power distribution device for flywheel energy storage participating in primary frequency regulation, provided in an embodiment of the present invention, is shown. For ease of explanation, only the parts relevant to the embodiment of the present invention are shown, and are described in detail below:

[0089] like Figure 2 As shown, the flywheel energy storage power distribution device 100 participating in primary frequency regulation includes:

[0090] Frequency modulation power acquisition module 110 is used to acquire the frequency modulation power carried by the frequency modulation power command;

[0091] The basic allocation module 120 is used to determine the basic allocation power and frequency modulation time of each flywheel energy storage unit based on the remaining energy of the flywheel energy storage units in the flywheel energy storage array and the frequency modulation power.

[0092] The low-power flywheel rejection module 130 is used to identify flywheel energy storage units in the flywheel energy storage array whose basic allocated power is less than the minimum power limit as second flywheel energy storage units; and to reject the second flywheel energy storage units from the flywheel energy storage array.

[0093] The high-power flywheel limiting module 140 is used to identify flywheel energy storage units in the updated flywheel energy storage array whose basic allocated power is greater than the maximum power limit as third flywheel energy storage units, and to use the maximum power limit as the allocated power of each third flywheel energy storage unit, thereby removing the third flywheel energy storage unit from the flywheel energy storage array.

[0094] The secondary power distribution module 150 is used to determine the power distribution for each flywheel energy storage unit in the updated flywheel energy storage array.

[0095] In one possible implementation, the flywheel energy storage power distribution device 100 participating in primary frequency regulation further includes:

[0096] The low-energy flywheel elimination module is used to identify flywheel energy storage units in the flywheel energy storage array whose schedulable energy is less than a first preset energy as first flywheel energy storage units; and to eliminate the first flywheel energy storage units from the flywheel energy storage array.

[0097] In one possible implementation, the basic allocation module 120 includes:

[0098] According to the formula Determine the base power allocation for each flywheel energy storage unit;

[0099] According to the formula Determine the frequency modulation time;

[0100] in, Indicates the first i The basic power distribution of each flywheel energy storage unit in the discharge state. Indicates the first i Dispatchable energy of each flywheel energy storage unit; This indicates the frequency modulation power. N This indicates the number of flywheel energy storage units in the flywheel energy storage array; t The frequency modulation time is indicated; wherein, in the charging state, the schedulable energy is the difference between the full-scale energy and the remaining energy of the flywheel energy storage unit, and in the discharging state, the schedulable energy is the remaining energy of the flywheel energy storage unit.

[0101] In one possible implementation, the flywheel energy storage power distribution device 100 participating in primary frequency regulation further includes:

[0102] The minimum power limit determination module is used to determine the magnitude of the minimum power limit based on the frequency modulation time; and the frequency modulation time is positively correlated with the minimum power limit.

[0103] In one possible implementation, the secondary power distribution module 150 includes:

[0104] Based on formula Determine the allocated power of the remaining flywheel energy storage units;

[0105] in, Indicates the first j The power distribution of each flywheel energy storage unit Indicates the first j The dispatchable energy of each flywheel energy storage unit; t represents the frequency modulation time;

[0106] In the charging state, the dispatchable energy is the difference between the full-scale energy and the remaining energy of the flywheel energy storage unit; in the discharging state, the dispatchable energy is the remaining energy of the flywheel energy storage unit.

[0107] In one possible implementation, the flywheel energy storage power distribution device 100 participating in primary frequency regulation further includes a battery-powered module for:

[0108] Calculate the sum of the allocated power of each flywheel energy storage unit in the updated flywheel energy storage array, and use it as the remaining power;

[0109] If the remaining power is less than the unallocated power, the remaining power is subtracted from the unallocated power to obtain the power borne by the battery system; the unallocated power is the value obtained by subtracting the allocated power from the frequency modulation power; the allocated power is the product of the maximum power limit and the number of third flywheel energy storage units.

[0110] Figure 3 This is a schematic diagram of a terminal provided in an embodiment of the present invention. Figure 3 As shown, the terminal 3 in this embodiment includes: a processor 30, a memory 31, and a computer program 32 stored in the memory 31 and executable on the processor 30. When the processor 30 executes the computer program 32, it implements the steps in the above embodiments of the power allocation method for flywheel energy storage participating in primary frequency regulation, for example... Figure 1 Steps S101 to S105 are shown. Alternatively, when the processor 30 executes the computer program 32, it implements the functions of each module / unit in the above-described device embodiments, for example... Figure 2 The functions of modules 110 to 150 are shown.

[0111] For example, the computer program 32 can be divided into one or more modules / units, which are stored in the memory 31 and executed by the processor 30 to complete the present invention. The one or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program 32 in the terminal 3.

[0112] The terminal 3 can be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal 3 may include, but is not limited to, a processor 30 and a memory 31. Those skilled in the art will understand that... Figure 3 This is merely an example of terminal 3 and does not constitute a limitation on terminal 3. It may include more or fewer components than shown, or combine certain components, or different components. For example, the terminal may also include input / output devices, network access devices, buses, etc.

[0113] The processor 30 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0114] The memory 31 can be an internal storage unit of the terminal 3, such as a hard disk or memory of the terminal 3. The memory 31 can also be an external storage device of the terminal 3, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc., equipped on the terminal 3. Furthermore, the memory 31 can include both internal storage units and external storage devices of the terminal 3. The memory 31 is used to store the computer program and other programs and data required by the terminal. The memory 31 can also be used to temporarily store data that has been output or will be output.

[0115] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0116] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0117] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0118] In the embodiments provided by this invention, it should be understood that the disclosed devices / terminals and methods can be implemented in other ways. For example, the device / terminal embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0119] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0120] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0121] If the integrated module / unit is implemented as 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, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of the above embodiments of the power allocation method for each flywheel energy storage participating in primary frequency regulation. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0122] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A power distribution method for flywheel energy storage participating in primary frequency regulation, characterized in that, include: Obtain the frequency modulation power carried by the frequency modulation power command; Based on the remaining energy of the flywheel energy storage units in the flywheel energy storage array and the frequency modulation power, the basic allocated power and frequency modulation time of each flywheel energy storage unit are determined; The flywheel energy storage unit in the flywheel energy storage array whose basic allocated power is less than the minimum power limit is designated as the second flywheel energy storage unit. Remove the second flywheel energy storage unit from the flywheel energy storage array; In the updated flywheel energy storage array, flywheel energy storage units with a basic allocated power greater than the maximum power limit are designated as third flywheel energy storage units, and the maximum power limit is used as the allocated power of each third flywheel energy storage unit. The third flywheel energy storage units are then removed from the flywheel energy storage array. Determine the allocated power for each flywheel energy storage unit in the updated flywheel energy storage array; The flywheel energy storage unit in the flywheel energy storage array whose basic allocated power is less than the minimum power limit is designated as the second flywheel energy storage unit. Before removing the second flywheel energy storage unit from the flywheel energy storage array, the method further includes: The minimum power limit is determined based on the frequency modulation time; and the frequency modulation time is positively correlated with the minimum power limit. Determining the minimum power limit based on the frequency modulation time includes: Through formula Calculate the minimum power limit; where, t Indicates the frequency modulation time. Indicates the minimum power limit. Indicates the initial minimum power limit; j This indicates the unit adjustable power value.

2. The power allocation method for flywheel energy storage participating in primary frequency regulation according to claim 1, characterized in that, Before determining the base allocated power and frequency modulation time of each flywheel energy storage unit based on the remaining energy of the flywheel energy storage units in the flywheel energy storage array and the frequency modulation power, the method further includes: The flywheel energy storage unit in the flywheel energy storage array whose schedulable energy is less than a first preset energy is designated as the first flywheel energy storage unit; the first flywheel energy storage unit is removed from the flywheel energy storage array; wherein, in the charging state, the schedulable energy is the difference between the full-scale energy and the remaining energy of the flywheel energy storage unit, and in the discharging state, the schedulable energy is the remaining energy of the flywheel energy storage unit.

3. The power allocation method for flywheel energy storage participating in primary frequency regulation according to claim 1, characterized in that, The determination of the basic allocated power and frequency modulation time for each flywheel energy storage unit based on the remaining energy of the flywheel energy storage units in the flywheel energy storage array and the frequency modulation power includes: According to the formula Determine the base power allocation for each flywheel energy storage unit; According to the formula Determine the frequency modulation time; in, Indicates the first i The basic power distribution of each flywheel energy storage unit in the discharge state. Indicates the first i Dispatchable energy of each flywheel energy storage unit; This indicates the frequency modulation power. N This indicates the number of flywheel energy storage units in the flywheel energy storage array; t The frequency modulation time is indicated; wherein, in the charging state, the schedulable energy is the difference between the full-scale energy and the remaining energy of the flywheel energy storage unit, and in the discharging state, the schedulable energy is the remaining energy of the flywheel energy storage unit.

4. The power allocation method for flywheel energy storage participating in primary frequency regulation according to claim 1, characterized in that, The determination of the allocated power for each flywheel energy storage unit in the updated flywheel energy storage array includes: Based on formula Determine the allocated power of the remaining flywheel energy storage units; in, Indicating the updated flywheel energy storage array, the first... j The power distribution of each flywheel energy storage unit Indicates the first j The dispatchable energy of each flywheel energy storage unit; t represents the frequency modulation time; In the charging state, the dispatchable energy is the difference between the full-scale energy and the remaining energy of the flywheel energy storage unit; in the discharging state, the dispatchable energy is the remaining energy of the flywheel energy storage unit.

5. The power allocation method for flywheel energy storage participating in primary frequency regulation according to claim 4, characterized in that, After determining the allocated power of each flywheel energy storage unit in the updated flywheel energy storage array, the method further includes: Calculate the sum of the allocated power of each flywheel energy storage unit in the updated flywheel energy storage array, and use it as the remaining power; If the remaining power is less than the unallocated power, the unallocated power is subtracted from the remaining power to obtain the power borne by the battery system; the unallocated power is the value obtained by subtracting the allocated power from the frequency modulation power; the allocated power is the product of the maximum power limit and the number of third flywheel energy storage units.

6. A power distribution device for flywheel energy storage participating in primary frequency regulation, characterized in that, include: The frequency modulation power acquisition module is used to acquire the frequency modulation power carried by the frequency modulation power command; The basic allocation module is used to determine the basic allocation power and frequency modulation time of each flywheel energy storage unit based on the remaining energy of the flywheel energy storage units in the flywheel energy storage array and the frequency modulation power. The low-power flywheel rejection module is used to designate flywheel energy storage units in the flywheel energy storage array whose basic allocated power is less than the minimum power limit as second flywheel energy storage units; and to reject the second flywheel energy storage units from the flywheel energy storage array. A high-power flywheel limiting module is used to designate flywheel energy storage units in the updated flywheel energy storage array whose basic allocated power is greater than the maximum power limit as third flywheel energy storage units, and to use the maximum power limit as the allocated power of each third flywheel energy storage unit, thereby removing the third flywheel energy storage unit from the flywheel energy storage array. The secondary power allocation module is used to determine the allocated power of each flywheel energy storage unit in the updated flywheel energy storage array; Flywheel energy storage power distribution devices participating in primary frequency regulation also include: A minimum power limit determination module is used to determine the magnitude of the minimum power limit based on the frequency modulation time; and the frequency modulation time is positively correlated with the minimum power limit. The minimum power limit determination module is specifically used for: Through formula Calculate the minimum power limit; where, t Indicates the frequency modulation time. Indicates the minimum power limit. Indicates the initial minimum power limit; j This indicates the unit adjustable power value.

7. The power distribution device for flywheel energy storage participating in primary frequency regulation according to claim 6, characterized in that, The device further includes: The low-energy flywheel elimination module is used to identify flywheel energy storage units in the flywheel energy storage array whose schedulable energy is less than a first preset energy as first flywheel energy storage units; and to eliminate the first flywheel energy storage units from the flywheel energy storage array.

8. A terminal comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the power distribution method for flywheel energy storage participating in primary frequency regulation as described in any one of claims 1 to 5.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the power distribution method for flywheel energy storage participating in primary frequency regulation as described in any one of claims 1 to 5.

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