A power distribution method, system, and electronic equipment for a flywheel energy storage group.

Abstract

This invention provides a power allocation method, system, and electronic device for a flywheel energy storage group, belonging to the field of flywheel energy storage. The method includes: calculating the maximum charging power, maximum discharging power, and average SOC value of each flywheel array based on real-time parameters of the flywheel energy storage group; sequentially allocating power to each flywheel array according to the overall frequency modulation power command and the average SOC value of each flywheel array to determine the charging reference power and discharging reference power of each flywheel array; determining the charging reference power of each flywheel unit in the flywheel array based on the maximum charging power of each flywheel unit in the flywheel array and the charging reference power of the flywheel array; and determining the discharging reference power of each flywheel unit in the flywheel array based on the maximum discharging power of each flywheel unit in the flywheel array and the discharging reference power of the flywheel array. This invention extends the charging and discharging time of the flywheel energy storage group and keeps the flywheel energy storage group operating at its optimal performance.

Description

Technical Field

[0001] This invention relates to the field of flywheel energy storage, and in particular to a power distribution method, system, and electronic equipment for a flywheel energy storage group used in frequency regulation. Background Technology

[0002] The traditional power system is undergoing a transformation. With a high proportion of renewable energy being integrated into the power system, significant risks have been posed to the safe and stable operation of the power grid. Currently, the power and frequency regulation tasks of the grid are undertaken by thermal power generation. However, the instability and intermittency of renewable energy generation necessitate frequent frequency regulation operations by thermal power plants. Due to the large inertia and high latency of thermal power units, their response to AGC (Automatic Generation Control) commands is slow. Furthermore, they suffer from insufficient primary frequency regulation, slow secondary frequency regulation ramp-up rates, and high operating costs. Adopting a combined energy storage and thermal power frequency regulation approach can fully utilize the rapid response capabilities of energy storage systems to compensate for deviations in the response of thermal power units, thereby improving the frequency regulation capabilities of thermal power plants.

[0003] Different types of energy storage have different response times, which can affect their performance in frequency regulation within combined thermal power units. Electromagnetic energy storage has the fastest response speed, in the millisecond range, but its storage capacity is generally small and its cost is relatively high, limiting its large-scale application. Battery energy storage has a response speed in the second range, and there are many types. Based on the different battery chemistry, energy storage batteries can be roughly divided into four types: lead-acid batteries, lithium batteries, flow batteries, and sodium-sulfur batteries. Battery energy storage is currently the most mature and reliable energy storage technology, playing an important role in grid applications. Among physical energy storage technologies, compressed air energy storage has strong endurance but long response time and low specific capacity. Flywheel energy storage, on the other hand, has the advantages of fast charging time and high power density, and therefore has the potential to be used as an energy storage device in many applications, such as power balancing, grid frequency support / control, and voltage dip mitigation.

[0004] Because individual flywheels have small capacity and short discharge time, in practice, multiple flywheels are first connected in parallel to form a flywheel array, and then multiple arrays are used to form a large-capacity flywheel energy storage group to expand the energy storage capacity, so as to achieve long-term frequency regulation tasks and flexible coordinated control of multiple units. At present, there are two power coordination strategies for flywheel energy storage arrays: equal power and equal duration allocation schemes. However, neither of these schemes takes into account the operating characteristics of individual flywheels. Under long-term charging and discharging conditions, the flywheel charge imbalance and power reduction problems are prone to occur. Summary of the Invention

[0005] The purpose of this invention is to provide a power distribution method, system, and electronic device for a flywheel energy storage group, which can extend the charging and discharging time of the flywheel energy storage group and keep the flywheel energy storage group operating at its optimal performance.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] A power allocation method for a flywheel energy storage group, wherein the flywheel energy storage group includes multiple flywheel arrays, each flywheel array includes multiple flywheel units, and the power allocation method for the flywheel energy storage group includes:

[0008] Obtain real-time parameters of the flywheel energy storage group; the real-time parameters include the frequency regulation power command, the current speed value of each flywheel unit, the maximum charging power of each flywheel unit, and the maximum discharging power of each flywheel unit.

[0009] Based on the real-time parameters of the flywheel energy storage group, calculate the maximum charging power, the maximum discharging power, and the average SOC value of each flywheel array.

[0010] Based on the total frequency modulation power command and the average SOC value of each flywheel array, power is allocated to each flywheel array in sequence to determine the charging reference power and discharging reference power of each flywheel array.

[0011] For any flywheel array, the charging reference power of each flywheel unit in the flywheel array is determined based on the maximum charging power of each flywheel unit in the flywheel array and the charging reference power of the flywheel array; the discharge reference power of each flywheel unit in the flywheel array is determined based on the maximum discharging power of each flywheel unit in the flywheel array and the discharging reference power of the flywheel array.

[0012] Optionally, based on the real-time parameters of the flywheel energy storage group, the maximum charging power of each flywheel array, the maximum discharging power of each flywheel array, and the average SOC value of each flywheel array are calculated, specifically including:

[0013] For any single flywheel unit, calculate the current charge of the flywheel unit based on its current rotational speed and the moment of inertia of its rotor.

[0014] Calculate the current SOC value of the flywheel unit based on its current charge level and maximum charge level.

[0015] For any flywheel array, the maximum charging power of the flywheel array is calculated based on the maximum charging power of each flywheel unit in the flywheel array;

[0016] Calculate the maximum discharge power of the flywheel array based on the maximum discharge power of each individual flywheel in the flywheel array;

[0017] The average SOC value of the flywheel array is calculated based on the current SOC value of each flywheel unit in the flywheel array.

[0018] Optionally, based on the overall frequency modulation power command and the average SOC value of each flywheel array, power is sequentially allocated to each flywheel array to determine the charging reference power and discharging reference power of each flywheel array, specifically including:

[0019] If the total frequency modulation power command is greater than 0, then according to the total frequency modulation power command, the power is allocated to each flywheel array in order of increasing average SOC value to determine the charging reference power of each flywheel array.

[0020] If the total frequency modulation power command is less than 0, then according to the total frequency modulation power command, the power is allocated to each flywheel array in descending order of average SOC value to determine the discharge reference power of each flywheel array.

[0021] Optionally, the maximum charging power of each flywheel array is greater than or equal to 0;

[0022] According to the frequency modulation power command, power is allocated to each flywheel array in ascending order of average SOC value to determine the charging reference power of each flywheel array, specifically including:

[0023] The flywheel arrays are sorted in descending order of average SOC value.

[0024] When allocating power to the i-th flywheel array, determine whether the maximum charging power of the i-th flywheel array is less than or equal to the i-th remaining power command; i = N, N-1, ..., 1, where N is the total number of flywheel arrays in the flywheel energy storage group; the N-th remaining power command is the total frequency modulation power command;

[0025] If so, the charging reference power of the i-th flywheel array is the maximum charging power of the i-th flywheel array. The difference between the i-th remaining power command and the maximum charging power of the i-th flywheel array is calculated to obtain the (i-1)-th remaining power command. Power is allocated to the (i-1)-th flywheel array until power allocation stops when i=1.

[0026] Otherwise, the charging reference power of the i-th flywheel array is the i-th remaining power command, and the charging reference power of the (i-1)-th to the 1st flywheel array is 0.

[0027] Optionally, the maximum discharge power of each flywheel array is less than or equal to 0;

[0028] According to the overall frequency modulation power command, power is allocated to each flywheel array in descending order of average SOC value to determine the discharge reference power of each flywheel array, specifically including:

[0029] The flywheel arrays are sorted in descending order of average SOC value.

[0030] When allocating power to the i-th flywheel array, determine whether the maximum discharge power of the i-th flywheel array is greater than or equal to the i-th remaining power command; i = 1, 2, ..., N, where N is the total number of flywheel arrays in the flywheel energy storage group; the first remaining power command is the frequency modulation power command.

[0031] If so, the discharge reference power of the i-th flywheel array is the maximum discharge power of the i-th flywheel array. The difference between the i-th remaining power command and the maximum discharge power of the i-th flywheel array is calculated to obtain the (i+1)-th remaining power command. Power is allocated to the (i+1)-th flywheel array until i = N, at which point the power allocation stops.

[0032] Otherwise, the discharge reference power of the i-th flywheel array is the i-th remaining power command, and the discharge reference power of the (i+1)-th to N-th flywheel arrays is 0.

[0033] Optionally, the charging reference power of the j-th flywheel in the i-th flywheel array is calculated using the following formula:

[0034]

[0035] in, The charging reference power for the j-th flywheel unit in the i-th flywheel array. Let be the maximum charging power of the j-th flywheel in the i-th flywheel array. Let M be the charging reference power for the i-th flywheel array, and M be the total number of flywheel units in the i-th flywheel array.

[0036] Optionally, the discharge reference power of the j-th flywheel unit in the i-th flywheel array is calculated using the following formula:

[0037]

[0038] in, Let be the discharge reference power of the j-th flywheel unit in the i-th flywheel array. The maximum discharge power of the j-th flywheel in the i-th flywheel array is given by [the value of the flywheel]. Let M be the discharge reference power of the i-th flywheel array, and M be the total number of individual flywheels in the i-th flywheel array.

[0039] To achieve the above objectives, the present invention also provides the following solution:

[0040] A power distribution system for a flywheel energy storage group includes:

[0041] The parameter acquisition unit is used to acquire the real-time parameters of the flywheel energy storage group; the real-time parameters include the frequency modulation power command, the current speed value of each flywheel unit, the maximum charging power of each flywheel unit, and the maximum discharging power of each flywheel unit.

[0042] An array parameter determination unit, connected to the parameter acquisition unit, is used to calculate the maximum charging power, the maximum discharging power, and the average SOC value of each flywheel array based on the real-time parameters of the flywheel energy storage group.

[0043] An array power allocation unit, connected to the array parameter determination unit, is used to sequentially allocate power to each flywheel array according to the frequency modulation power command and the average SOC value of each flywheel array, so as to determine the charging reference power and discharging reference power of each flywheel array.

[0044] A single-unit power distribution unit, connected to the array power distribution unit, is used to determine, for any flywheel array, the charging reference power of each flywheel unit in the flywheel array based on the maximum charging power of each flywheel unit in the flywheel array and the charging reference power of the flywheel array; and to determine the discharge reference power of each flywheel unit in the flywheel array based on the maximum discharging power of each flywheel unit in the flywheel array and the discharge reference power of the flywheel array.

[0045] To achieve the above objectives, the present invention also provides the following solution:

[0046] An electronic device includes a memory and a processor, the memory storing a computer program and the processor running the computer program to cause the electronic device to perform the power distribution method of the flywheel energy storage group described above.

[0047] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0048] This invention allocates power to each flywheel array sequentially based on the total frequency modulation power command and the average SOC value of each flywheel array. During charging, flywheel arrays with low charge will be charged first, and flywheel arrays with high charge will be discharged first, so that the flywheel group can operate at its best performance. Not every flywheel array can be allocated a power command, thus reducing the number of flywheel movements to a certain extent, maximizing the power output of the flywheel group, and extending the charging and discharging time. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments 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.

[0050] Figure 1 This is a schematic diagram of the flywheel energy storage group.

[0051] Figure 2 This is a flowchart of the power allocation method for the flywheel energy storage group of the present invention;

[0052] Figure 3 A flowchart illustrating the power distribution of the flywheel array during charging;

[0053] Figure 4 This is a schematic diagram of the power distribution system of the flywheel energy storage group of the present invention.

[0054] Symbol explanation:

[0055] Parameter acquisition unit-1, array parameter determination unit-2, array power allocation unit-3, individual unit power allocation unit-4. Detailed Implementation

[0056] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] The purpose of this invention is to provide a power distribution method for a flywheel energy storage group. The method estimates the output value of a flywheel individual based on its current charge state, thereby obtaining the maximum charging and discharging power of the flywheel array and distributing the power accordingly. This extends the charging and discharging time of the flywheel group and maintains the balance of flywheel charge as much as possible.

[0058] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0059] like Figure 1 As shown, the flywheel energy storage group consists of N flywheel arrays, and each flywheel array contains M flywheel units.

[0060] Example 1

[0061] like Figure 2As shown, this embodiment provides a power allocation method for a flywheel energy storage group, including:

[0062] S1: Obtain real-time parameters of the flywheel energy storage group. Real-time parameters include the overall frequency regulation power command, the current rotational speed of each flywheel unit, the maximum charging power of each flywheel unit, and the maximum discharging power of each flywheel unit.

[0063] Specifically, relevant parameters of the flywheel energy storage group can be obtained through the distributed control system, including the total frequency regulation power command P of the flywheel energy storage group. * The current rotational speed ω of each flywheel unit i,j SOC values ​​of each flywheel unit i,j Maximum charging power of each flywheel unit Maximum discharge power of each flywheel unit

[0064] S2: Based on the real-time parameters of the flywheel energy storage group, calculate the maximum charging power of each flywheel array, the maximum discharging power of each flywheel array, and the average SOC value of each flywheel array.

[0065] Furthermore, S2 specifically includes:

[0066] (1) For any single flywheel unit, based on the current rotational speed of the flywheel unit and the moment of inertia of the flywheel unit rotor, the formula is used. Calculate the current charge of the flywheel unit. Here, E(t) is the current charge of the flywheel unit, J is the moment of inertia of the flywheel unit rotor, ω(t) is the rotor speed of the flywheel unit (current speed value), and t represents the current time.

[0067] (2) Based on the current charge level and the maximum charge level of the flywheel unit, the formula is used. Calculate the current SOC value of the flywheel unit. Where SOC(t) is the current SOC value of the flywheel unit, and E... max This represents the maximum charge capacity of a single flywheel unit.

[0068] (3) For any flywheel array, calculate the maximum charging power of the flywheel array based on the maximum charging power of each individual flywheel in the array. Specifically, the maximum charging power of the i-th flywheel array is calculated using the following formula:

[0069]

[0070] in, The maximum charging power of the i-th flywheel array. M represents the maximum charging power of the j-th flywheel unit in the i-th flywheel array, and M represents the total number of flywheel units in the i-th flywheel array.

[0071] (4) Calculate the maximum discharge power of the flywheel array based on the maximum discharge power of each individual flywheel in the flywheel array. Specifically, the maximum discharge power of the i-th flywheel array is calculated using the following formula:

[0072]

[0073] in, The maximum discharge power of the i-th flywheel array is... It represents the maximum discharge power of the j-th flywheel unit in the i-th flywheel array.

[0074] (5) Calculate the average SOC value of the flywheel array based on the current SOC value of each flywheel unit in the flywheel array. Specifically, the average SOC value of the i-th flywheel array is calculated using the following formula:

[0075]

[0076] Among them, SOC i Let s be the average SOC value of the i-th flywheel array. i,j Let be the current SOC value of the j-th flywheel unit in the i-th flywheel array.

[0077] To enable the flywheel energy storage group to respond to frequency-modulated power commands for an extended period, flywheel arrays with high average State of Charge (SOC) should be prioritized during discharge, as flywheels with high SOC can respond for a sufficiently long time under the rated power command. Based on the characteristics of individual flywheels, when their rotational speed falls below a certain value, the output power cannot reach the commanded value. Therefore, this invention employs a prioritization method, prioritizing the discharge of flywheel arrays with high average SOC to ensure sufficient remaining charge to maintain power and reduce the number of operations by flywheel arrays with low SOC. Conversely, during charging, flywheel arrays with low SOC are prioritized to respond to charging power commands, ensuring sufficient charging margin and reducing the number of operations by these flywheel arrays.

[0078] S3: Based on the total frequency modulation power command and the average SOC value of each flywheel array, power is allocated to each flywheel array in sequence to determine the charging reference power and discharging reference power of each flywheel array.

[0079] In this embodiment, the maximum charging power of each flywheel array is greater than or equal to 0. The maximum discharging power of each flywheel array is less than or equal to 0. The flywheel arrays are sorted in descending order of their average SOC values. Let the average SOC ranking of the flywheel arrays be: SOC1>SOC2>...>SOC N .

[0080] First, set the charging reference power and discharging reference power of all flywheel arrays, as well as the charging reference power and discharging reference power of all individual flywheels, to 0, and then start allocating power.

[0081] A total FM power command greater than zero indicates charging, and less than zero indicates discharging. For a single flywheel unit, a charging operation is performed when the received power command is greater than zero; a discharging operation is performed when the received power command is less than zero. That is: P * <0: The flywheel energy storage group is discharging as a whole; P * >0: The flywheel energy storage group is fully charged.

[0082] If the total frequency modulation power command is greater than 0, then according to the total frequency modulation power command, power is allocated to each flywheel array in ascending order of average SOC value to determine the charging reference power for each flywheel array. The order of power allocation during charging is shown in Table 1.

[0083] Table 1 Power distribution sequence during charging

[0084]

[0085] Specifically, when allocating power to the i-th flywheel array, it is determined whether the maximum charging power of the i-th flywheel array is less than or equal to the i-th remaining power command; i = N, N-1, ..., 1, where N is the total number of flywheel arrays in the flywheel energy storage group; the N-th remaining power command is the total frequency modulation power command. If yes, the charging reference power of the i-th flywheel array is the maximum charging power of the i-th flywheel array, and the difference between the i-th remaining power command and the maximum charging power of the i-th flywheel array is calculated to obtain the (i-1)-th remaining power command. Power is then allocated to the (i-1)-th flywheel array until i = 1, at which point power allocation stops. Otherwise, the charging reference power of the i-th flywheel array is the i-th remaining power command, and the charging reference power from the (i-1)-th flywheel array to the 1st flywheel array is 0.

[0086] To better understand the solution of the present invention, the following is combined with... Figure 3 This section further explains the power distribution process during charging.

[0087] Starting from number N, for SOC N The corresponding Nth flywheel array is allocated by first comparing the total frequency modulation power command P. * With the maximum charging power of the Nth flywheel array The size, if Let the charging reference power of the Nth flywheel array be... Remaining power command like make Next, the (N-1)th flywheel array corresponding to number N-1 is allocated by first comparing the remaining power command p. sy With the maximum charging power of the (N-1)th flywheel array ,like Let the charging reference power of the (N-1)th flywheel array like make

[0088] The charging section allocates power to each flywheel array in reverse order of SOC sorting until all power commands are allocated or all flywheel arrays have received non-zero power commands. Remaining power command P sy The allocation process is subject to change.

[0089] If the total frequency modulation power command is less than 0, then according to the total frequency modulation power command, the power is allocated to each flywheel array in descending order of average SOC value to determine the discharge reference power of each flywheel array. The power allocation order during discharge is shown in Table 2.

[0090] Table 2 Power Distribution Sequence During Discharge

[0091]

[0092] Specifically, when allocating power to the i-th flywheel array, it is determined whether the maximum discharge power of the i-th flywheel array is greater than or equal to the i-th remaining power command; i = 1, 2, ..., N, where N is the total number of flywheel arrays in the flywheel energy storage group; the first remaining power command is the total frequency modulation power command. If so, the discharge reference power of the i-th flywheel array is the maximum discharge power of the i-th flywheel array, and the difference between the i-th remaining power command and the maximum discharge power of the i-th flywheel array is calculated to obtain the (i+1)-th remaining power command. Power is then allocated to the (i+1)-th flywheel array until power allocation stops when i = N. Otherwise, the discharge reference power of the i-th flywheel array is the i-th remaining power command, and the discharge reference power of the (i+1)-th to N-th flywheel arrays is 0.

[0093] To better understand the solution of the present invention, the power distribution process during discharge is further described below.

[0094] Starting from number 1, the first flywheel array corresponding to SOC1 is allocated. First, the total frequency modulation power command P is compared. * With the maximum discharge power of the first flywheel array The size, if Let the discharge reference power of the first flywheel array be... Remaining power command like make p sy =0; secondly, allocate power to the second flywheel array corresponding to number 2, first comparing the remaining power command p. sy With the maximum discharge power of the second flywheel array like Let the discharge reference power of the second flywheel array be... like make Then, the third flywheel array corresponding to number 3 is allocated.

[0095] The discharge section allocates power to each flywheel array according to the ascending order of the SOC sorting results, until the power command allocation is completed or all flywheel arrays have been allocated a non-zero power command. In the power allocation scheme during discharge, P * p sy and All are numbers less than 0.

[0096] S4: For any flywheel array, determine the charging reference power of each flywheel unit in the flywheel array based on the maximum charging power of each flywheel unit in the flywheel array and the charging reference power of the flywheel array. Determine the discharge reference power of each flywheel unit in the flywheel array based on the maximum discharging power of each flywheel unit in the flywheel array and the discharging reference power of the flywheel array.

[0097] Specifically, within the flywheel array, the power is allocated to each flywheel unit according to the principle of maximum output ratio. The charging reference power of the j-th flywheel unit in the i-th flywheel array is calculated using the following formula:

[0098]

[0099] in, The charging reference power for the j-th flywheel unit in the i-th flywheel array. Let be the maximum charging power of the j-th flywheel in the i-th flywheel array. Let M be the charging reference power for the i-th flywheel array, and M be the total number of flywheel units in the i-th flywheel array.

[0100] The discharge reference power of the j-th flywheel in the i-th flywheel array is calculated using the following formula:

[0101]

[0102] in, Let be the discharge reference power of the j-th flywheel unit in the i-th flywheel array. The maximum discharge power of the j-th flywheel in the i-th flywheel array is given by [the value of the flywheel]. Let M be the discharge reference power of the i-th flywheel array, and M be the total number of individual flywheels in the i-th flywheel array.

[0103] The obtained flywheel reference power command is sent to the controller of the flywheel energy storage group through the DCS (Distributed Control System), which enables the flywheel to charge or discharge according to the requirements of the frequency regulation command, and the total output power of the flywheel group can meet the requirements of the frequency regulation command.

[0104] This invention optimizes the flywheel power distribution strategy, maximizing the power output of the flywheel group and extending the discharge time. During charging, flywheel arrays with low charge are charged first, while flywheel arrays with high charge are discharged first, ensuring the flywheel group operates at optimal performance.

[0105] Furthermore, the present invention allocates power to the flywheel arrays according to the order of the average SOC value and the maximum charging power or maximum discharging power of each flywheel array. Not every flywheel array can be allocated a power command, thus reducing the number of flywheel movements to a certain extent.

[0106] Example 2

[0107] In order to implement the method corresponding to Embodiment 1 above and achieve the corresponding functions and technical effects, a power distribution system for a flywheel energy storage group is provided below.

[0108] like Figure 4 As shown, the power distribution system of the flywheel energy storage group provided in this embodiment includes: parameter acquisition unit 1, array parameter determination unit 2, array power distribution unit 3 and individual power distribution unit 4.

[0109] The parameter acquisition unit 1 is used to acquire the real-time parameters of the flywheel energy storage group. The real-time parameters include the frequency regulation power command, the current rotational speed of each flywheel unit, the maximum charging power of each flywheel unit, and the maximum discharging power of each flywheel unit.

[0110] The array parameter determination unit 2 is connected to the parameter acquisition unit 1. The array parameter determination unit 2 is used to calculate the maximum charging power of each flywheel array, the maximum discharging power of each flywheel array, and the average SOC value of each flywheel array based on the real-time parameters of the flywheel energy storage group.

[0111] The array power allocation unit 3 is connected to the array parameter determination unit 2. The array power allocation unit 3 is used to allocate power to each flywheel array in sequence according to the frequency modulation power command and the average SOC value of each flywheel array, so as to determine the charging reference power and discharging reference power of each flywheel array.

[0112] Individual power allocation unit 4 is connected to the array power allocation unit 3. Individual power allocation unit 4 is used to determine the charging reference power of each flywheel unit in the flywheel array based on the maximum charging power of each flywheel unit in the flywheel array and the charging reference power of the flywheel array for any flywheel array; and to determine the discharge reference power of each flywheel unit in the flywheel array based on the maximum discharge power of each flywheel unit in the flywheel array and the discharge reference power of the flywheel array.

[0113] Compared to the prior art, the power distribution system of the flywheel energy storage group provided in this embodiment has the same beneficial effects as the power distribution method of the flywheel energy storage group provided in Embodiment 1, and will not be repeated here.

[0114] Example 3

[0115] This embodiment provides an electronic device, including a memory and a processor. The memory is used to store computer programs, and the processor runs the computer programs to enable the electronic device to execute the power distribution method of the flywheel energy storage group in Embodiment 1.

[0116] Alternatively, the aforementioned electronic device may be a server.

[0117] In addition, embodiments of the present invention also provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the power allocation method for the flywheel energy storage group of Embodiment 1.

[0118] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0119] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A power distribution method for a flywheel energy storage group, wherein the flywheel energy storage group includes multiple flywheel arrays, and each flywheel array includes multiple flywheel units, characterized in that, The power allocation method of the flywheel energy storage group includes: Obtain real-time parameters of the flywheel energy storage group; the real-time parameters include the frequency regulation power command, the current speed value of each flywheel unit, the maximum charging power of each flywheel unit, and the maximum discharging power of each flywheel unit. Based on the real-time parameters of the flywheel energy storage group, calculate the maximum charging power, the maximum discharging power, and the average SOC value of each flywheel array. Based on the total frequency modulation power command and the average SOC value of each flywheel array, power is allocated to each flywheel array in sequence to determine the charging reference power and discharging reference power of each flywheel array. For any flywheel array, the charging reference power of each flywheel unit in the flywheel array is determined based on the maximum charging power of each flywheel unit in the flywheel array and the charging reference power of the flywheel array; the discharge reference power of each flywheel unit in the flywheel array is determined based on the maximum discharging power of each flywheel unit in the flywheel array and the discharging reference power of the flywheel array.

2. The power distribution method for the flywheel energy storage group according to claim 1, characterized in that, Based on the real-time parameters of the flywheel energy storage group, the maximum charging power, maximum discharging power, and average SOC value of each flywheel array are calculated, specifically including: For any single flywheel unit, calculate the current charge of the flywheel unit based on its current rotational speed and the moment of inertia of its rotor. Calculate the current SOC value of the flywheel unit based on its current charge level and maximum charge level. For any flywheel array, the maximum charging power of the flywheel array is calculated based on the maximum charging power of each flywheel unit in the flywheel array; Calculate the maximum discharge power of the flywheel array based on the maximum discharge power of each individual flywheel in the flywheel array; The average SOC value of the flywheel array is calculated based on the current SOC value of each flywheel unit in the flywheel array.

3. The power allocation method for the flywheel energy storage group according to claim 1, characterized in that, Based on the overall frequency modulation power command and the average SOC value of each flywheel array, power is allocated sequentially to each flywheel array to determine the charging reference power and discharging reference power of each flywheel array, specifically including: If the total frequency modulation power command is greater than 0, then according to the total frequency modulation power command, the power is allocated to each flywheel array in order of increasing average SOC value to determine the charging reference power of each flywheel array. If the total frequency modulation power command is less than 0, then according to the total frequency modulation power command, the power is allocated to each flywheel array in descending order of average SOC value to determine the discharge reference power of each flywheel array.

4. The power distribution method for the flywheel energy storage group according to claim 3, characterized in that, The maximum charging power of each flywheel array is greater than or equal to 0; According to the frequency modulation power command, power is allocated to each flywheel array in ascending order of average SOC value to determine the charging reference power of each flywheel array, specifically including: The flywheel arrays are sorted in descending order of average SOC value. When allocating power to the i-th flywheel array, determine whether the maximum charging power of the i-th flywheel array is less than or equal to the i-th remaining power command; i = N, N-1, ..., 1, where N is the total number of flywheel arrays in the flywheel energy storage group; the N-th remaining power command is the total frequency modulation power command; If so, the charging reference power of the i-th flywheel array is the maximum charging power of the i-th flywheel array. The difference between the i-th remaining power command and the maximum charging power of the i-th flywheel array is calculated to obtain the (i-1)-th remaining power command. Power is allocated to the (i-1)-th flywheel array until power allocation stops when i=1. Otherwise, the charging reference power of the i-th flywheel array is the i-th remaining power command, and the charging reference power of the (i-1)-th to the 1st flywheel array is 0.

5. The power distribution method for the flywheel energy storage group according to claim 3, characterized in that, The maximum discharge power of each flywheel array is less than or equal to 0; According to the overall frequency modulation power command, power is allocated to each flywheel array in descending order of average SOC value to determine the discharge reference power of each flywheel array, specifically including: The flywheel arrays are sorted in descending order of average SOC value. When allocating power to the i-th flywheel array, determine whether the maximum discharge power of the i-th flywheel array is greater than or equal to the i-th remaining power command; i = 1, 2, ..., N, where N is the total number of flywheel arrays in the flywheel energy storage group; the first remaining power command is the frequency modulation power command. If so, the discharge reference power of the i-th flywheel array is the maximum discharge power of the i-th flywheel array. The difference between the i-th remaining power command and the maximum discharge power of the i-th flywheel array is calculated to obtain the (i+1)-th remaining power command. Power is allocated to the (i+1)-th flywheel array until i = N, at which point the power allocation stops. Otherwise, the discharge reference power of the i-th flywheel array is the i-th remaining power command, and the discharge reference power of the (i+1)-th to N-th flywheel arrays is 0.

6. The power allocation method for the flywheel energy storage group according to claim 1, characterized in that, The charging reference power of the j-th flywheel in the i-th flywheel array is calculated using the following formula: in, The charging reference power for the j-th flywheel unit in the i-th flywheel array. Let be the maximum charging power of the j-th flywheel in the i-th flywheel array. Let M be the charging reference power for the i-th flywheel array, and M be the total number of flywheel units in the i-th flywheel array.

7. The power allocation method for the flywheel energy storage group according to claim 1, characterized in that, The discharge reference power of the j-th flywheel in the i-th flywheel array is calculated using the following formula: in, Let be the discharge reference power of the j-th flywheel unit in the i-th flywheel array. The maximum discharge power of the j-th flywheel in the i-th flywheel array is given by [the value of the flywheel]. Let M be the discharge reference power of the i-th flywheel array, and M be the total number of individual flywheels in the i-th flywheel array.

8. A power distribution system for a flywheel energy storage group, characterized in that, The power distribution system of the flywheel energy storage group includes: The parameter acquisition unit is used to acquire the real-time parameters of the flywheel energy storage group; the real-time parameters include the frequency modulation power command, the current speed value of each flywheel unit, the maximum charging power of each flywheel unit, and the maximum discharging power of each flywheel unit. An array parameter determination unit, connected to the parameter acquisition unit, is used to calculate the maximum charging power, the maximum discharging power, and the average SOC value of each flywheel array based on the real-time parameters of the flywheel energy storage group. An array power allocation unit, connected to the array parameter determination unit, is used to sequentially allocate power to each flywheel array according to the frequency modulation power command and the average SOC value of each flywheel array, so as to determine the charging reference power and discharging reference power of each flywheel array. A single-unit power distribution unit, connected to the array power distribution unit, is used to determine, for any flywheel array, the charging reference power of each flywheel unit in the flywheel array based on the maximum charging power of each flywheel unit in the flywheel array and the charging reference power of the flywheel array; and to determine the discharge reference power of each flywheel unit in the flywheel array based on the maximum discharging power of each flywheel unit in the flywheel array and the discharge reference power of the flywheel array.

9. An electronic device, characterized in that, It includes a memory and a processor, the memory being used to store a computer program, and the processor running the computer program to cause the electronic device to perform the power distribution method of the flywheel energy storage group according to any one of claims 1 to 7.

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