A flywheel energy storage group power distribution method, system and electronic device

Abstract

The application provides a flywheel energy storage group power distribution method, system and electronic equipment, and belongs to the flywheel energy storage field.The power distribution method comprises the following steps: obtaining reference power, the rotating speed of each flywheel unit and the maximum output power; calculating the total rotating speed, the average rotating speed and the maximum output power of the flywheel array according to the rotating speed and the maximum output power of each flywheel unit; dividing the flywheel array into a priority charging group, a secondary charging and discharging group and a priority discharging group according to the average rotating speed of each flywheel array; determining the output power of each group according to the maximum output power of each flywheel array, the reference power and the maximum output power of each group; calculating the output power of each flywheel array according to the output power of each group, the maximum output power of each group and the maximum output power of each flywheel array; and calculating the output power of each flywheel unit according to the output power of each flywheel array, the total rotating speed and the rotating speed of each flywheel unit. The application avoids overcharging and overdischarging of the flywheel unit, and improves the utilization rate of the flywheel group.

Description

Technical Field

[0001] This invention relates to the field of flywheel energy storage, and in particular to a method, system, and electronic device for power distribution control of flywheel energy storage groups based on individual unit rotation speed. Background Technology

[0002] As the proportion of new energy sources in the power system gradually increases, the randomness, volatility, and low inertia of new energy power generation pose significant challenges to the real-time power balance of the power system. Solving the new problems arising from accurate power generation planning, dispatching, and operation control of new energy power systems under high proportions is a prominent challenge facing new energy power systems. To address these issues, energy storage systems are a suitable solution, aiming to achieve the significant characteristics of new power systems by enabling the integrated development of wind, solar, hydro, thermal, and energy storage systems, as well as the coordinated development of power generation, grid, load, and storage.

[0003] Flywheel energy storage utilizes physical methods to store energy, offering advantages over other energy storage technologies such as high energy density, high efficiency, low loss, no pollution, and ease of maintenance. Flywheel energy storage boasts a maximum charge-discharge cycle count of approximately 1.07 million, 20 times that of supercapacitors, with a charge-discharge efficiency reaching 96%, making it a highly promising energy storage method. However, flywheel energy storage systems exhibit high power density but relatively low energy density, limiting their application. Energy storage systems for frequency regulation applications typically require megawatt-level capacity, making it difficult for a single flywheel to support grid demands. Therefore, coordinated operation of flywheel energy storage arrays is necessary. Firstly, the output power of the entire flywheel energy storage system should adhere to its reference. Secondly, the energy levels of each energy storage unit should be balanced to maintain the maximum power capacity of the entire system; otherwise, energy storage units reaching critical high or low energy levels will be forced offline, thus reducing the overall power capacity of the system.

[0004] Flywheel energy storage clusters have been widely used in recent years due to their unique performance. However, in practical applications, the solution to the power distribution problem of flywheel clusters is often still the equal power distribution method, which can lead to overcharging and over-discharging of individual cells and cannot maintain the healthy operation of the flywheel cluster. 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 improve the rationality of power distribution of individual flywheels, avoid overcharging and over-discharging of individual flywheels, and improve the utilization rate of the flywheel group.

[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 the reference power of the flywheel energy storage group, the rotational speed of each flywheel unit, and the maximum output power of each flywheel unit;

[0009] For any flywheel array, the total speed, average speed, and maximum output power of the flywheel array are calculated based on the rotational speed of each flywheel unit and the maximum output power of each flywheel unit.

[0010] Based on the average rotational speed of each flywheel array, the flywheel arrays in the flywheel energy storage group are divided into a priority charging group, a secondary charging and discharging group, and a priority discharging group. The average rotational speed of the flywheel arrays in the priority charging group is between the minimum required operating speed and the lower boundary of the target speed range. The average rotational speed of the flywheel arrays in the secondary charging and discharging group is within the target speed range. The average rotational speed of the flywheel arrays in the priority discharging group is between the upper boundary of the target speed range and the maximum required operating speed.

[0011] Based on the maximum output power of each flywheel array, calculate the maximum output power of the priority charging group, the maximum output power of the secondary charging and discharging group, and the maximum output power of the priority discharging group.

[0012] Based on the reference power, the maximum output power of the priority charging group, the maximum output power of the secondary charging and discharging group, and the maximum output power of the priority discharging group, the output power of the priority charging group, the output power of the secondary charging and discharging group, and the output power of the priority discharging group are determined.

[0013] The output power of each flywheel array is calculated based on the output power of the priority charging group, the maximum output power of the priority charging group, the output power of the secondary charging and discharging group, the maximum output power of the secondary charging and discharging group, the output power of the priority discharging group, the maximum output power of the priority discharging group, and the maximum output power of each flywheel array.

[0014] Based on the output power of each flywheel array, the total rotational speed of each flywheel array, and the rotational speed of each flywheel unit in each flywheel array, the output power of each flywheel unit is calculated in order to distribute power among the flywheel units.

[0015] Optionally, the total rotational speed of flywheel array i can be calculated using the following formula:

[0016]

[0017] Where, ω i Let ω be the total rotational speed of flywheel array i, n be the number of individual flywheels in flywheel array i, and ω be the total rotational speed of flywheel array i.ij Let be the rotational speed of flywheel unit j in flywheel array i.

[0018] Optionally, the average rotational speed of flywheel array i can be calculated using the following formula:

[0019]

[0020] Where, ω iave Let be the average rotational speed of flywheel array i.

[0021] Optionally, the maximum output power of flywheel array i can be calculated using the following formula:

[0022]

[0023] Among them, P i P represents the maximum output power of flywheel array i, n represents the number of individual flywheels in flywheel array i, and P represents the maximum output power of flywheel array i. ij Let be the maximum output power of flywheel unit j in flywheel array i.

[0024] Optionally, the output power of the priority charging group, the output power of the secondary charging and discharging group, and the output power of the priority discharging group are determined based on the reference power, the maximum output power of the priority charging group, the maximum output power of the secondary charging and discharging group, and the maximum output power of the priority discharging group, specifically including:

[0025] The charging and discharging state of the flywheel energy storage group is determined based on the reference power; if the reference power is positive, the flywheel energy storage group is charged, and if the reference power is negative, the flywheel energy storage group is discharged.

[0026] Calculate the absolute value of the reference power to obtain the absolute value of the reference power;

[0027] When the flywheel energy storage group is charging, it is determined whether the maximum output power of the priority charging group is greater than or equal to the absolute value of the reference power. If so, the output power of the priority charging group is the absolute value of the reference power, and the output power of the secondary charging and discharging group and the output power of the priority discharging group are both 0.

[0028] Otherwise, calculate the difference between the absolute value of the reference power and the maximum output power of the priority charging group to obtain the first-level charging power value;

[0029] Determine whether the maximum output power of the secondary charge and discharge group is greater than or equal to the first-stage charging power value. If so, the output power of the priority charging group is the maximum output power of the priority charging group, the output power of the secondary charge and discharge group is the first-stage charging power value, and the output power of the priority discharging group is 0.

[0030] Otherwise, calculate the difference between the first-stage charging power value and the maximum output power of the second-stage charging and discharging group to obtain the second-stage charging power value;

[0031] Determine whether the maximum output power of the priority discharge group is greater than or equal to the secondary charging power value. If so, the output power of the priority charging group is the maximum output power of the priority charging group, the output power of the secondary charge and discharge group is the maximum output power of the secondary charge and discharge group, and the output power of the priority discharge group is the secondary charging power value.

[0032] Otherwise, the output power of the priority charging group is the maximum output power of the priority charging group, the output power of the secondary charging and discharging group is the maximum output power of the secondary charging and discharging group, and the output power of the priority discharging group is the maximum output power of the priority discharging group.

[0033] When the flywheel energy storage group is discharging, it is determined whether the maximum output power of the priority discharge group is greater than or equal to the absolute value of the reference power. If so, the output power of the priority discharge group is the absolute value of the reference power, and the output power of the secondary charge and discharge group and the output power of the priority charge group are both 0.

[0034] Otherwise, calculate the difference between the absolute value of the reference power and the maximum output power of the priority discharge group to obtain the first-level discharge power value;

[0035] Determine whether the maximum output power of the secondary charge and discharge group is greater than or equal to the first-stage discharge power value. If so, the output power of the priority discharge group is the maximum output power of the priority discharge group, the output power of the secondary charge and discharge group is the first-stage discharge power value, and the output power of the priority charging group is 0.

[0036] Otherwise, calculate the difference between the first-stage discharge power value and the maximum output power of the second-stage charge-discharge group to obtain the second-stage discharge power value;

[0037] Determine whether the maximum output power of the priority charging group is greater than or equal to the secondary discharge power value. If so, the output power of the priority discharge group is the maximum output power of the priority discharge group, the output power of the secondary charge and discharge group is the maximum output power of the secondary charge and discharge group, and the output power of the priority charging group is the secondary discharge power value.

[0038] Otherwise, the output power of the priority discharge group is the maximum output power of the priority charging group, the output power of the secondary charge and discharge group is the maximum output power of the secondary charge and discharge group, and the output power of the priority charging group is the maximum output power of the priority discharge group.

[0039] Optionally, the output power of each flywheel array is calculated based on the output power of the priority charging group, the maximum output power of the priority charging group, the output power of the secondary charging and discharging group, the maximum output power of the secondary charging and discharging group, the output power of the priority discharging group, the maximum output power of the priority discharging group, and the maximum output power of each flywheel array. Specifically, this includes:

[0040] The output power of each flywheel array in the priority charging group is calculated based on the output power of the priority charging group, the maximum output power of each flywheel array in the priority charging group, and the maximum output power of the priority charging group.

[0041] Calculate the output power of each flywheel array in the secondary charge and secondary amplifier group based on the output power of the secondary charge and secondary amplifier group, the maximum output power of each flywheel array in the secondary charge and secondary amplifier group, and the maximum output power of the secondary charge and secondary amplifier group.

[0042] The output power of each flywheel array in the priority discharge group is calculated based on the output power of the priority discharge group, the maximum output power of each flywheel array in the priority discharge group, and the maximum output power of the priority discharge group.

[0043] Optionally, the output power of the flywheel array k in the priority charging group can be calculated using the following formula:

[0044]

[0045] Among them, P kout P represents the output power of the flywheel array k in the priority charging group. fcharout For the output power of the priority charging group, P k P represents the maximum output power of the flywheel array k in the priority charging group. fchar This is the maximum output power of the priority charging group.

[0046] Optionally, the output power of individual flywheel j in flywheel array i can be calculated using the following formula:

[0047]

[0048] Among them, P ijout P represents the output power of individual flywheel j in flywheel array i. iout ω represents the output power of the flywheel array i. i Let ω be the total rotational speed of flywheel array i. ij Let be the rotational speed of flywheel unit j in flywheel array i.

[0049] To achieve the above objectives, the present invention also provides the following solution:

[0050] A power distribution system for a flywheel energy storage group includes:

[0051] The data acquisition unit is used to acquire the reference power of the flywheel energy storage group, the rotational speed of each flywheel unit, and the maximum output power of each flywheel unit.

[0052] An array data determination unit, connected to the data acquisition unit, is used to calculate the total rotational speed, average rotational speed, and maximum output power of any flywheel array based on the rotational speed of each flywheel unit in the flywheel array and the maximum output power of each flywheel unit.

[0053] A grouping unit, connected to the array data determination unit, is used to divide the flywheel arrays in the flywheel energy storage group into a priority charging group, a secondary charging and discharging group, and a priority discharging group based on the average rotational speed of each flywheel array. The average rotational speed of the flywheel arrays in the priority charging group is between the minimum required operating speed and the lower boundary of the target speed region; the average rotational speed of the flywheel arrays in the secondary charging and discharging group is within the target speed region; and the average rotational speed of the flywheel arrays in the priority discharging group is between the upper boundary of the target speed region and the maximum required operating speed.

[0054] The maximum power determination unit is connected to the grouping unit and the array data determination unit respectively, and is used to calculate the maximum output power of the priority charging group, the maximum output power of the secondary charging and discharging group and the maximum output power of the priority discharging group based on the maximum output power of each flywheel array.

[0055] A group output power determination unit, connected to the group maximum power determination unit, is used to determine the output power of the priority charging group, the output power of the secondary charging and discharging group, and the output power of the priority discharging group based on the reference power, the maximum output power of the priority charging group, the maximum output power of the secondary charging and discharging group, and the maximum output power of the priority discharging group.

[0056] An array output power determination unit, connected to the group output power determination unit, is used to calculate the output power of each flywheel array based on the output power of the priority charging group, the maximum output power of the priority charging group, the output power of the secondary charging and discharging group, the maximum output power of the secondary charging and discharging group, the output power of the priority discharging group, the maximum output power of the priority discharging group, and the maximum output power of each flywheel array.

[0057] A single-unit output power determination unit, connected to the array output power determination unit, is used to calculate the output power of each flywheel unit based on the output power of each flywheel array, the total rotational speed of each flywheel array, and the rotational speed of each flywheel unit in each flywheel array, so as to allocate power to each flywheel unit.

[0058] To achieve the above objectives, the present invention also provides the following solution:

[0059] 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.

[0060] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0061] This invention optimizes the rotational speed of individual flywheels within the flywheel energy storage group during operation, ensuring the highest output efficiency for each flywheel. As more flywheels operate within this optimal range, the overall output power of the flywheel energy storage group increases, thus optimizing its operation and maintaining it at maximum power, thereby improving its utilization rate. Furthermore, the invention ensures consistent rotational speeds among the flywheels within the array. By dividing the flywheel array into priority charging, secondary charging / discharging, and priority discharging groups, a small signal will not trigger all flywheels to operate, reducing the number of flywheel actions and thus minimizing unnecessary losses. This improves the rationality of power allocation among flywheels and prevents overcharging and over-discharging. Attached Figure Description

[0062] 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.

[0063] Figure 1 This is a schematic diagram of the flywheel energy storage group.

[0064] Figure 2 This is a flowchart of the power allocation method for the flywheel energy storage group of the present invention;

[0065] Figure 3 A flowchart illustrating the output power allocation for each priority group;

[0066] Figure 4 This is a schematic diagram of the power distribution system of the flywheel energy storage group of the present invention.

[0067] Symbol explanation:

[0068] Data acquisition unit-1, array data determination unit-2, grouping unit-3, group maximum power determination unit-4, group output power determination unit-5, array output power determination unit-6, individual unit output power determination unit-7. Detailed Implementation

[0069] 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.

[0070] The purpose of this invention is to provide a power allocation method, system, and electronic device for a flywheel energy storage group. The flywheel energy storage group power allocation logic based on the average array rotation speed allocates the reference power of the flywheel energy storage group and plans the energy level of the flywheel from the perspective of group control to avoid overcharging and over-discharging of individual units, thereby maintaining the healthy operation of the flywheel group.

[0071] 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.

[0072] like Figure 1 As shown, the flywheel energy storage group consists of m flywheel arrays, where each flywheel array contains n flywheel units. The flywheel unit is the smallest unit.

[0073] Example 1

[0074] like Figure 2 As shown, this embodiment provides a power allocation method for a flywheel energy storage group, including:

[0075] S1: Obtain the reference power of the flywheel energy storage group, the rotational speed of each flywheel unit, and the maximum output power of each flywheel unit. Specifically, the reference power of the flywheel group is obtained separately through the DCS (Distributed Control System), denoted as P. ref The rotational speed and current output power of each individual flywheel in the flywheel array are obtained and denoted as ω. ij P ij Where ω ij P represents the rotational speed of individual flywheel j within flywheel array i. ij This represents the output power (maximum output power) of individual flywheel j within flywheel array i.

[0076] S2: For any flywheel array, calculate the total speed, average speed and maximum output power of the flywheel array based on the rotational speed of each flywheel unit and the maximum output power of each flywheel unit.

[0077] Specifically, the total rotational speed of flywheel array i is calculated using the following formula:

[0078]

[0079] The average rotational speed of flywheel array i is calculated using the following formula:

[0080]

[0081] The maximum output power of flywheel array i is calculated using the following formula:

[0082]

[0083] Where, ω i Let ω be the total rotational speed of flywheel array i, n be the number of individual flywheels in flywheel array i, and ω be the total rotational speed of flywheel array i. ij Let ω be the rotational speed of flywheel j in flywheel array i. iave Let P be the average rotational speed of flywheel array i. i P represents the maximum output power of flywheel array i, n represents the number of individual flywheels in flywheel array i, and P represents the maximum output power of flywheel array i. ij Let be the maximum output power of flywheel unit j in flywheel array i.

[0084] S3: Based on the average rotational speed of each flywheel array, the flywheel arrays in the flywheel energy storage group are divided into priority charging group, secondary charging and secondary discharging group and priority discharging group.

[0085] In the priority charging group, the average rotational speed of the flywheel array is between the minimum required operating speed and the lower boundary of the target speed range. In the secondary charging / discharging group, the average rotational speed of the flywheel array is within the target speed range. In the priority discharging group, the average rotational speed of the flywheel array is between the upper boundary of the target speed range and the maximum required operating speed.

[0086] The energy calculation for flywheel energy storage is as follows:

[0087]

[0088] Where E is the energy stored in the flywheel, J is the moment of inertia of the flywheel rotor, and ω is the rotational speed of the flywheel.

[0089] Therefore, the flywheel energy level can be represented by its rotational speed. The current flywheel state is determined by the rotational speed. When the current flywheel speed is between the minimum required operating speed and the lower boundary of the target speed range, the flywheel is defined as being in a priority charging state. In this state, the flywheel can respond to a larger proportion of power when receiving a charging command, meaning it receives priority in allocating total power. When the flywheel is within the target speed range, its state is defined as being in a secondary charging / discharging state. In this state, regardless of whether a charging or discharging command is received, power is allocated only after the flywheel in the corresponding priority state has been fully allocated. When the current flywheel speed is between the upper boundary of the target speed range and the flywheel's maximum operating speed, its state is defined as being in a priority discharging state. In this state, the flywheel responds to the discharging signal first and then the charging signal last. Table 1 shows the states corresponding to the average rotational speed of the array, where ω... low For the minimum required operating speed, ω a ω is the lower bound of the target speed range. b ω is the upper bound of the target speed range. high This is the highest required operating speed.

[0090] Table 1 Array Status Table

[0091] Average speed range <![CDATA[ω low <ω iave <ω a ]]> <![CDATA[ω a <ω iave <ω b ]]> <![CDATA[ω b <ω iave <ω high ]]> Array state Priority charging state Second charge and second discharge state Preferred discharge state

[0092] S4: Based on the maximum output power of each flywheel array, calculate the maximum output power of the priority charging group, the maximum output power of the secondary charging and discharging group, and the maximum output power of the priority discharging group.

[0093] Specifically, the maximum output power of each flywheel group in the same state is summed to obtain the maximum output power P of the priority charging group. fchar The maximum output power P of the charge-discharge group mid and the maximum output power P of the priority discharge group fdisc .

[0094] S5: Determine the output power of the priority charging group, the output power of the secondary charging and discharging group, and the output power of the priority discharging group based on the reference power, the maximum output power of the priority charging group, the maximum output power of the secondary charging and discharging group, and the maximum output power of the priority discharging group.

[0095] Furthermore, due to the reference power P of the flywheel energy storage group ref The values ​​can be positive or negative. A positive value indicates that the flywheel energy storage group needs to absorb energy from the grid, while a negative value indicates that the flywheel energy storage group needs to release energy back to the grid. Energy absorption and energy release represent charging and discharging behaviors, respectively, and therefore need to be determined based on the reference power P. ref The sign of the slash determines the priority order for each group to participate in the allocation. For example... Figure 3 As shown, step S5 includes:

[0096] S501: Determine the charging / discharging state of the flywheel energy storage group based on the reference power. If the reference power is positive, the flywheel energy storage group is charged; if the reference power is negative, the flywheel energy storage group is discharged.

[0097] S502: Calculate the absolute value of the reference power to obtain the absolute value of the reference power.

[0098] S511: When the flywheel energy storage group is charging, determine whether the maximum output power of the priority charging group is greater than or equal to the absolute value of the reference power.

[0099] S512: If so, the output power of the priority charging group is the absolute value of the reference power, and the output power of the secondary charging and discharging group and the output power of the priority discharging group are both 0.

[0100] S513: Otherwise, calculate the difference between the absolute value of the reference power and the maximum output power of the priority charging group to obtain the first-level charging power value.

[0101] S514: Determine whether the maximum output power of the secondary charge / discharge group is greater than or equal to the primary charging power value.

[0102] S515: If so, the output power of the priority charging group is the maximum output power of the priority charging group, the output power of the secondary charging and discharging group is the first-level charging power value, and the output power of the priority discharging group is 0.

[0103] S516: Otherwise, calculate the difference between the first-level charging power value and the maximum output power of the second-level charging and discharging group to obtain the second-level charging power value.

[0104] S517: Determine whether the maximum output power of the priority discharge group is greater than or equal to the secondary charging power value.

[0105] S518: If so, the output power of the priority charging group is the maximum output power of the priority charging group, the output power of the secondary charging and discharging group is the maximum output power of the secondary charging and discharging group, and the output power of the priority discharging group is the secondary charging power value.

[0106] S519: Otherwise, the output power of the priority charging group is the maximum output power of the priority charging group, the output power of the secondary charging and discharging group is the maximum output power of the secondary charging and discharging group, and the output power of the priority discharging group is the maximum output power of the priority discharging group.

[0107] S521: When the flywheel energy storage group is discharging, determine whether the maximum output power of the priority discharge group is greater than or equal to the absolute value of the reference power.

[0108] S522: If so, the output power of the priority discharge group is the absolute value of the reference power, and the output power of the secondary charge and discharge group and the output power of the priority charge group are both 0.

[0109] S523: Otherwise, calculate the difference between the absolute value of the reference power and the maximum output power of the priority discharge group to obtain the first-level discharge power value.

[0110] S524: Determine whether the maximum output power of the secondary charge / discharge group is greater than or equal to the primary discharge power value.

[0111] S525: If so, the output power of the priority discharge group is the maximum output power of the priority discharge group, the output power of the secondary charge and discharge group is the first-level discharge power value, and the output power of the priority charge group is 0.

[0112] S526: Otherwise, calculate the difference between the first-stage discharge power value and the maximum output power of the secondary charge-discharge group to obtain the second-stage discharge power value.

[0113] S527: Determine whether the maximum output power of the priority charging group is greater than or equal to the secondary discharge power value.

[0114] S528: If so, the output power of the priority discharge group is the maximum output power of the priority discharge group, the output power of the secondary charge and discharge group is the maximum output power of the secondary charge and discharge group, and the output power of the priority charge group is the secondary discharge power value.

[0115] S529: Otherwise, the output power of the priority discharge group is the maximum output power of the priority charging group, the output power of the secondary charge and discharge group is the maximum output power of the secondary charge and discharge group, and the output power of the priority charging group is the maximum output power of the priority discharge group.

[0116] To better understand the logic of this invention, the power allocation process of each group will be further explained below in conjunction with specific embodiments.

[0117] When the reference power is positive, the priority charging group is designated as Group I, the secondary charging and discharging group as Group II, and the priority discharging group as Group III. When the reference power is negative, the priority discharging group is designated as Group I, the secondary charging and discharging group as Group II, and the priority charging group as Group III. The maximum output power of Group I is denoted as P. α The maximum output power of group II is denoted as P. β The maximum output power of group III is denoted as P. γ .

[0118] The power allocation logic follows the order of groups I, II, and III, allocating power values ​​accordingly, with each group maximizing the allocated reference power. Allocation logic: The absolute value of the reference power is first compared with that of group I. If group I can fully meet the reference power requirement, i.e., P... α Greater than the reference power P ref The absolute value of the total reference power output requirement is then independently borne by Group I, and the output power P allocated to Group I is... αout For reference power P ref The absolute value of P, the output power allocated to groups II and III is 0. α Less than the reference power P ref The absolute value of the power reference value is then obtained by subtracting the maximum output power of Group I from the absolute value of the power reference value, and then comparing it with the maximum output power of Group II, and so on. Finally, the output power P allocated to Groups I, II, and III is obtained. αout P βout P γout .

[0119] According to the reference power P ref The sign of the reference power P determines the output power allocated to the three groups, restoring the power output of each priority group. ref When the value is positive, it means that the flywheel energy storage group needs to be charged, and the output power P allocated to group I will be [value missing]. αout Output power P allocated to the priority charging group fcharout The output power P allocated to group II βout The output power P allocated to the secondary charge and discharge group midout The output power P allocated to group III γout Output power P allocated to the priority discharge group fdiscout When the reference power P ref When the value is negative, it means the flywheel energy storage group needs to discharge. Note that the output power allocated to groups I, II, and III is positive; in this case, it needs to be multiplied by -1 to become negative. The output power P allocated to group I... αout The negative number is the output power P allocated to the priority discharge group. fdiscout The output power P allocated to group II βout The opposite of the value is the output power P allocated to the charge and discharge group. midout The output power P allocated to group III γout The negative number is the output power P allocated to the priority charging group. fcharout .

[0120] In step 5, the allocation of reference power ensures that a small signal will not cause all flywheel units to participate in the action, thus reducing the number of flywheel actions and consequently reducing unnecessary losses.

[0121] S6: Calculate the output power of each flywheel array based on the output power of the priority charging group, the maximum output power of the priority charging group, the output power of the secondary charging and discharging group, the maximum output power of the secondary charging and discharging group, the output power of the priority discharging group, the maximum output power of the priority discharging group, and the maximum output power of each flywheel array.

[0122] Since each priority group consists of many flywheel arrays, it is necessary to allocate the power of the priority group to each flywheel array. Here, the ratio of the maximum output power of each flywheel array to the maximum output power within the group is selected as a coefficient for allocation.

[0123] Specifically, (1) the output power of each flywheel array in the priority charging group is calculated based on the output power of the priority charging group, the maximum output power of each flywheel array in the priority charging group and the maximum output power of the priority charging group.

[0124] The output power of flywheel array k in the priority charging group is calculated using the following formula:

[0125]

[0126] Among them, P kout P represents the output power of the flywheel array k in the priority charging group. fcharout For the output power of the priority charging group, P k P represents the maximum output power of the flywheel array k in the priority charging group. fchar This is the maximum output power of the priority charging group.

[0127] (2) Calculate the output power of each flywheel array in the secondary charge and secondary amplifier group based on the output power of the secondary charge and secondary amplifier group, the maximum output power of each flywheel array in the secondary charge and secondary amplifier group and the maximum output power of the secondary charge and secondary amplifier group.

[0128] (3) Calculate the output power of each flywheel array in the priority discharge group based on the output power of the priority discharge group, the maximum output power of each flywheel array in the priority discharge group and the maximum output power of the priority discharge group.

[0129] The calculation formulas for the output power of each flywheel array in the secondary charge / discharge group and the priority discharge group are similar to those for the output power of flywheel array k in the priority charging group, and will not be repeated here.

[0130] S7: Based on the output power of each flywheel array, the total rotational speed of each flywheel array, and the rotational speed of each flywheel unit in each flywheel array, calculate the output power of each flywheel unit to allocate power to each flywheel unit. That is, generate power commands based on the allocated output power of each flywheel unit, and send the power commands to the controllers corresponding to each flywheel unit through the DCS to complete the control of the flywheel unit.

[0131] Specifically, the power distribution within the flywheel array follows a proportional distribution principle based on rotational speed. Flywheels with higher rotational speeds receive more power. This distribution method ensures that the rotational speeds within the flywheel array are more consistent, leading to more accurate judgment of the flywheels during array status assessment. The average rotational speed of the flywheel array is closer to the actual rotational speed of each individual flywheel.

[0132] The output power of individual flywheel j in flywheel array i is calculated using the following formula:

[0133]

[0134] Among them, P ijout P represents the output power of individual flywheel j in flywheel array i. iout ω represents the output power of the flywheel array i. i Let ω be the total rotational speed of flywheel array i. ij Let be the rotational speed of flywheel unit j in flywheel array i.

[0135] In step 7, the array output power is allocated according to the rotational speed ratio of each flywheel unit in the flywheel array, so that the rotational speed of each flywheel unit in the flywheel array tends to be consistent.

[0136] This invention plans the rotational speed to the optimal range when the flywheel energy storage group is running. Within this range, the flywheel output efficiency is the highest. Therefore, as the number of flywheels in the optimal speed range increases, the overall output power of the flywheel group increases. This optimizes the operating state of the flywheel energy storage group, keeps it at its maximum power as much as possible, and improves the utilization rate of the flywheel energy storage group.

[0137] Example 2

[0138] 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.

[0139] like Figure 4 As shown, this embodiment provides a power distribution system for a flywheel energy storage group, including: a data acquisition unit 1, an array data determination unit 2, a grouping unit 3, a group maximum power determination unit 4, a group output power determination unit 5, an array output power determination unit 6, and a single-unit output power determination unit 7.

[0140] Data acquisition unit 1 is used to acquire the reference power of the flywheel energy storage group, the rotational speed of each flywheel unit, and the maximum output power of each flywheel unit.

[0141] The array data determination unit 2 is connected to the data acquisition unit 1. The array data determination unit 2 is used to calculate the total speed, average speed and maximum output power of any flywheel array based on the speed of each flywheel unit in the flywheel array and the maximum output power of each flywheel unit.

[0142] Grouping unit 3 is connected to array data determination unit 2. Grouping unit 3 is used to divide the flywheel arrays in the flywheel energy storage group into priority charging group, secondary charging and discharging group, and priority discharging group according to the average rotational speed of each flywheel array. The average rotational speed of the flywheel arrays in the priority charging group is between the minimum required operating speed and the lower boundary of the target speed range. The average rotational speed of the flywheel arrays in the secondary charging and discharging group is within the target speed range; the average rotational speed of the flywheel arrays in the priority discharging group is between the upper boundary of the target speed range and the maximum required operating speed.

[0143] The maximum power determination unit 4 is connected to the grouping unit 3 and the array data determination unit 2 respectively. The maximum power determination unit 4 is used to calculate the maximum output power of the priority charging group, the maximum output power of the secondary charging and discharging group and the maximum output power of the priority discharging group based on the maximum output power of each flywheel array.

[0144] The group output power determination unit 5 is connected to the group maximum power determination unit 4. The group output power determination unit 5 is used to determine the output power of the priority charging group, the output power of the secondary charging and discharging group, and the output power of the priority discharging group based on the reference power, the maximum output power of the priority charging group, the maximum output power of the secondary charging and discharging group, and the maximum output power of the priority discharging group.

[0145] The array output power determination unit 6 is connected to the group output power determination unit 5. The array output power determination unit 6 is used to calculate the output power of each flywheel array based on the output power of the priority charging group, the maximum output power of the priority charging group, the output power of the secondary charging and discharging group, the maximum output power of the secondary charging and discharging group, the output power of the priority discharging group, the maximum output power of the priority discharging group, and the maximum output power of each flywheel array.

[0146] The individual output power determination unit 7 is connected to the array output power determination unit 6. The individual output power determination unit 7 is used to calculate the output power of each flywheel unit based on the output power of each flywheel array, the total rotation speed of each flywheel array, and the rotation speed of each flywheel unit in each flywheel array, so as to allocate power to each flywheel unit.

[0147] 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.

[0148] Example 3

[0149] This embodiment provides an electronic device, including a memory and a processor. The memory stores a computer program, and the processor runs the computer program to enable the electronic device to execute the power distribution method of the flywheel energy storage group in Embodiment 1.

[0150] Alternatively, the aforementioned electronic device may be a server.

[0151] 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.

[0152] 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.

[0153] 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 the reference power of the flywheel energy storage group, the rotational speed of each flywheel unit, and the maximum output power of each flywheel unit; For any flywheel array, the total speed, average speed, and maximum output power of the flywheel array are calculated based on the rotational speed of each flywheel unit and the maximum output power of each flywheel unit. Based on the average rotational speed of each flywheel array, the flywheel arrays in the flywheel energy storage group are divided into a priority charging group, a secondary charging and discharging group, and a priority discharging group. The average rotational speed of the flywheel arrays in the priority charging group is between the minimum required operating speed and the lower boundary of the target speed range. The average rotational speed of the flywheel arrays in the secondary charging and discharging group is within the target speed range. The average rotational speed of the flywheel arrays in the priority discharging group is between the upper boundary of the target speed range and the maximum required operating speed. Based on the maximum output power of each flywheel array, calculate the maximum output power of the priority charging group, the maximum output power of the secondary charging and discharging group, and the maximum output power of the priority discharging group. Based on the reference power, the maximum output power of the priority charging group, the maximum output power of the secondary charging and discharging group, and the maximum output power of the priority discharging group, the output power of the priority charging group, the output power of the secondary charging and discharging group, and the output power of the priority discharging group are determined. The output power of each flywheel array is calculated based on the output power of the priority charging group, the maximum output power of the priority charging group, the output power of the secondary charging and discharging group, the maximum output power of the secondary charging and discharging group, the output power of the priority discharging group, the maximum output power of the priority discharging group, and the maximum output power of each flywheel array. Based on the output power of each flywheel array, the total rotational speed of each flywheel array, and the rotational speed of each flywheel unit in each flywheel array, the output power of each flywheel unit is calculated in order to distribute power among the flywheel units. Specifically, determining the output power of the priority charging group, the output power of the secondary charging and discharging group, and the output power of the priority discharging group based on the reference power, the maximum output power of the priority charging group, the maximum output power of the secondary charging and discharging group, and the maximum output power of the priority discharging group includes: The charging and discharging state of the flywheel energy storage group is determined based on the reference power; if the reference power is positive, the flywheel energy storage group is charged, and if the reference power is negative, the flywheel energy storage group is discharged. Calculate the absolute value of the reference power to obtain the absolute value of the reference power; When the flywheel energy storage group is charging, it is determined whether the maximum output power of the priority charging group is greater than or equal to the absolute value of the reference power. If so, the output power of the priority charging group is the absolute value of the reference power, and the output power of the secondary charging and discharging group and the output power of the priority discharging group are both 0. Otherwise, calculate the difference between the absolute value of the reference power and the maximum output power of the priority charging group to obtain the first-level charging power value; Determine whether the maximum output power of the secondary charge and discharge group is greater than or equal to the first-stage charging power value. If so, the output power of the priority charging group is the maximum output power of the priority charging group, the output power of the secondary charge and discharge group is the first-stage charging power value, and the output power of the priority discharging group is 0. Otherwise, calculate the difference between the first-stage charging power value and the maximum output power of the second-stage charging and discharging group to obtain the second-stage charging power value; Determine whether the maximum output power of the priority discharge group is greater than or equal to the secondary charging power value. If so, the output power of the priority charging group is the maximum output power of the priority charging group, the output power of the secondary charge and discharge group is the maximum output power of the secondary charge and discharge group, and the output power of the priority discharge group is the secondary charging power value. Otherwise, the output power of the priority charging group is the maximum output power of the priority charging group, the output power of the secondary charging and discharging group is the maximum output power of the secondary charging and discharging group, and the output power of the priority discharging group is the maximum output power of the priority discharging group. When the flywheel energy storage group is discharging, it is determined whether the maximum output power of the priority discharge group is greater than or equal to the absolute value of the reference power. If so, the output power of the priority discharge group is the absolute value of the reference power, and the output power of the secondary charge and discharge group and the output power of the priority charge group are both 0. Otherwise, calculate the difference between the absolute value of the reference power and the maximum output power of the priority discharge group to obtain the first-level discharge power value; Determine whether the maximum output power of the secondary charge and discharge group is greater than or equal to the first-stage discharge power value. If so, the output power of the priority discharge group is the maximum output power of the priority discharge group, the output power of the secondary charge and discharge group is the first-stage discharge power value, and the output power of the priority charging group is 0. Otherwise, calculate the difference between the first-stage discharge power value and the maximum output power of the second-stage charge-discharge group to obtain the second-stage discharge power value; Determine whether the maximum output power of the priority charging group is greater than or equal to the secondary discharge power value. If so, the output power of the priority discharge group is the maximum output power of the priority discharge group, the output power of the secondary charge and discharge group is the maximum output power of the secondary charge and discharge group, and the output power of the priority charging group is the secondary discharge power value. Otherwise, the output power of the priority discharge group is the maximum output power of the priority charging group, the output power of the secondary charge and discharge group is the maximum output power of the secondary charge and discharge group, and the output power of the priority charging group is the maximum output power of the priority discharge group.

2. The power distribution method for the flywheel energy storage group according to claim 1, characterized in that, The flywheel array is calculated using the following formula. i Total speed: ； in, ω i flywheel array i Total rotational speed, n flywheel array i The number of individual flywheel units, ω ij flywheel array i Mid-flywheel unit j The rotational speed.

3. The power distribution method for the flywheel energy storage group according to claim 2, characterized in that, The flywheel array is calculated using the following formula. i Average rotational speed: ； in, ω iave flywheel array i The average rotational speed.

4. The power distribution method for the flywheel energy storage group according to claim 1, characterized in that, The flywheel array is calculated using the following formula. i Maximum output power: ； in, P i flywheel array i Maximum output power n flywheel array i The number of individual flywheel units, P ij flywheel array i Mid-flywheel unit j Maximum output power.

5. The power distribution method for the flywheel energy storage group according to claim 1, characterized in that, Based on the output power of the priority charging group, the maximum output power of the priority charging group, the output power of the secondary charging and discharging group, the maximum output power of the secondary charging and discharging group, the output power of the priority discharging group, the maximum output power of the priority discharging group, and the maximum output power of each flywheel array, the output power of each flywheel array is calculated, specifically including: The output power of each flywheel array in the priority charging group is calculated based on the output power of the priority charging group, the maximum output power of each flywheel array in the priority charging group, and the maximum output power of the priority charging group. Calculate the output power of each flywheel array in the secondary charge and secondary amplifier group based on the output power of the secondary charge and secondary amplifier group, the maximum output power of each flywheel array in the secondary charge and secondary amplifier group, and the maximum output power of the secondary charge and secondary amplifier group. The output power of each flywheel array in the priority discharge group is calculated based on the output power of the priority discharge group, the maximum output power of each flywheel array in the priority discharge group, and the maximum output power of the priority discharge group.

6. The power distribution method for the flywheel energy storage group according to claim 5, characterized in that, The flywheel array in the priority charging group is calculated using the following formula. k Output power: ； in, P kout flywheel array in priority charging group k 'output power' P fcharout For the output power of the priority charging group, P k flywheel array in priority charging group k Maximum output power P fchar This is the maximum output power of the priority charging group.

7. The power allocation method for the flywheel energy storage group according to claim 1, characterized in that, The flywheel array is calculated using the following formula. i Mid-flywheel unit j Output power: ； in, P ijout flywheel array i Mid-flywheel unit j 'output power' P iout flywheel array i 'output power' ω i flywheel array i Total rotational speed, ω ij flywheel array i Mid-flywheel unit j The rotational speed.

8. A power distribution system for a flywheel energy storage group, applied to the power distribution method of the flywheel energy storage group according to any one of claims 1-7, characterized in that, The power distribution system of the flywheel energy storage group includes: The data acquisition unit is used to acquire the reference power of the flywheel energy storage group, the rotational speed of each flywheel unit, and the maximum output power of each flywheel unit. An array data determination unit, connected to the data acquisition unit, is used to calculate the total rotational speed, average rotational speed, and maximum output power of any flywheel array based on the rotational speed of each flywheel unit in the flywheel array and the maximum output power of each flywheel unit. A grouping unit, connected to the array data determination unit, is used to divide the flywheel arrays in the flywheel energy storage group into a priority charging group, a secondary charging and discharging group, and a priority discharging group based on the average rotational speed of each flywheel array. The average rotational speed of the flywheel arrays in the priority charging group is between the minimum required operating speed and the lower boundary of the target speed region; the average rotational speed of the flywheel arrays in the secondary charging and discharging group is within the target speed region; and the average rotational speed of the flywheel arrays in the priority discharging group is between the upper boundary of the target speed region and the maximum required operating speed. The maximum power determination unit is connected to the grouping unit and the array data determination unit respectively, and is used to calculate the maximum output power of the priority charging group, the maximum output power of the secondary charging and discharging group and the maximum output power of the priority discharging group based on the maximum output power of each flywheel array. A group output power determination unit, connected to the group maximum power determination unit, is used to determine the output power of the priority charging group, the output power of the secondary charging and discharging group, and the output power of the priority discharging group based on the reference power, the maximum output power of the priority charging group, the maximum output power of the secondary charging and discharging group, and the maximum output power of the priority discharging group. An array output power determination unit, connected to the group output power determination unit, is used to calculate the output power of each flywheel array based on the output power of the priority charging group, the maximum output power of the priority charging group, the output power of the secondary charging and discharging group, the maximum output power of the secondary charging and discharging group, the output power of the priority discharging group, the maximum output power of the priority discharging group, and the maximum output power of each flywheel array. A single-unit output power determination unit, connected to the array output power determination unit, is used to calculate the output power of each flywheel unit based on the output power of each flywheel array, the total rotational speed of each flywheel array, and the rotational speed of each flywheel unit in each flywheel array, so as to allocate power to each flywheel unit.

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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