A control method and system for a parallel energy storage power supply

Abstract

The present invention relates to the technical field of power control, and specifically discloses a control method and system for a parallel energy storage power supply. The method includes the following steps: S1: Calculate the maximum output power of the energy storage unit according to the aging degree score, calculate the target output power and obtain the first sorting; determine the first target sorting position, and determine the energy storage unit for supplying energy to the load and the output power according to the first target sorting position; S2: Determine the second target sorting position according to the predicted demand power; obtain the second sorting according to the first sorting position interval, and determine the third target sorting position according to the second power difference; S3: Determine the rising unit and the falling unit, and adjust the output powers of the rising unit and the falling unit. The present invention can improve the rationality of the output power distribution of the energy storage unit and avoid insufficient power supply capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of power control, and particularly relates to a control method and system for a parallel energy storage power supply. Background Art

[0002] A parallel energy storage power supply is a system that connects multiple energy storage units (such as batteries, supercapacitors, etc.) in parallel to achieve larger capacity and higher efficiency energy storage and release. In parallel energy storage, each energy storage unit can independently perform charge and discharge operations, but their output voltages and currents are aggregated together to form a unified output interface.

[0003] By precisely controlling the output power of each energy storage unit, the energy distribution of the entire system can be optimized, energy waste can be reduced, and thus the overall efficiency can be improved. For example, when the demand is low, the output power of some energy storage units can be reduced to save energy; while when the demand peaks, the output power of the energy storage units can be increased to meet the demand. However, as the usage time of the energy storage unit increases, its maximum output power will continuously decrease, and it is possible that the total output power of the parallel output power supply cannot meet the load demand. Therefore, in the process of adjusting the output power of the energy storage unit, how to optimize the output power of each energy storage unit has become an urgent problem to be solved. Summary of the Invention

[0004] The purpose of the present invention is to provide a control method and system for a parallel energy storage power supply to solve the following technical problems:

[0005] As the usage time of the energy storage unit increases, its maximum output power will continuously decrease, and it is possible that the total output power of the parallel output power supply cannot meet the load demand. Therefore, in the process of adjusting the output power of the energy storage unit, how to optimize the output power of each energy storage unit has become an urgent problem to be solved.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A control method for a parallel energy storage power supply includes the following steps:

[0008] S1: Obtain the aging degree score k of a single energy storage unit, and calculate the maximum output power of the energy storage unit , pys represents the rated output power of the energy storage unit, calculate the target output power P = 0.9p, perform an ascending order sorting on the target output power to obtain the first sorting;

[0009] Determine the first target sorting position X1 in the first sorting, and the first target sorting position X1 satisfies the constraint: and , FSJ represents the current time The actual required power of the upper load, represents the sum of the first X1 target output powers, represents the sum of the first X1 - 1 target output powers;

[0010] The energy storage units corresponding to the first X1 - 1 target output powers in the first sorting supply energy at their respective corresponding target output powers, and the energy storage unit corresponding to the X1th target output power in the first sorting supplies energy with the first power difference for the output power;

[0011] S2: Substitute the next time node adjacent to the current time into the preset fitting curve f(t) to obtain the predicted demand power FYC, where t represents time, calculate the power to be adjusted PAF = FYC - FSJ, determine the second target sorting position X2 in the first sorting, and the second target sorting position X2 satisfies the constraint: and ;

[0012] Sort the target output powers whose sorting positions in the first sorting belong to the first sorting position interval [1, X2] in descending order to obtain the second sorting, calculate the second power difference and determine the third target sorting position X3 in the second sorting based on the power difference, and the third target sorting position X3 satisfies the constraint: and ;

[0013] S3: Determine the rising unit and the falling unit respectively based on the second target sorting position X2 and the third target sorting position X3, and adjust the output powers of the rising unit and the falling unit.

[0014] As a further solution of the present invention: In the step S3, the process of adjusting the output powers of the rising unit and the falling unit specifically includes:

[0015] Take the energy storage units corresponding to the target output powers whose sorting positions in the first sorting belong to the second sorting position interval [X1, X2] as the rising units, calculate the average rising speed , and each of the rising units increases the output power at the first rising speed until the output power of a certain rising unit reaches the corresponding target output power, and each of the rising units increases the output power at the second rising speed where represents the total number of rising units whose output powers have not reached the corresponding target output powers. Repeat the above steps until the total output power of the rising units reaches the power to be adjusted PAF;

[0016] Take the energy storage units corresponding to the top X3 target output powers in the second sorting as the decreasing units, and each of the decreasing units decreases the output power at a first decreasing speed until the output power of a certain decreasing unit becomes 0, and then each of the decreasing units decreases the output power at a second decreasing speed to decrease the output power. Let represent the total number of decreasing units with non-zero output power, and repeat the above steps until the total decreased output power of the decreasing units reaches the to-be-adjusted power PAF.

[0017] As a further solution of the present invention: when the to-be-adjusted power PAF is less than 0, perform the following steps:

[0018] Determine the fourth target sorting position X4 in the second sorting, and the fourth target sorting position satisfies the constraint: and , and take the energy storage units corresponding to the target output powers whose sorting positions in the second sorting belong to the third sorting position interval [1, X4] as the second decreasing units;

[0019] Each of the second decreasing units decreases the output power at a target decreasing speed until the output power of a certain second decreasing unit becomes 0, and then each of the decreasing units decreases the output power at a first target decreasing speed to decrease the output power. Let represent the total number of second decreasing units with non-zero output power, and repeat the above steps until the total decreased output power of the second decreasing units reaches the absolute value of the to-be-adjusted power.

[0020] As a further solution of the present invention: in step S2, when the to-be-adjusted power is equal to 0 and / or the second power difference is equal to 0, do not perform the subsequent steps of adjusting the output powers of the increasing units and the decreasing units.

[0021] As a further solution of the present invention: in step S2, the process of determining the fitting curve specifically includes:

[0022] Set m monitoring periods, where m is a preset number, and at preset time intervals within the monitoring periods Set several time nodes, obtain the required power of the load at the time nodes, calculate the average required power of the load at the same time nodes, and generate coordinate points (a, F a ), where F a represents the average required power corresponding to the time node a, and perform fitting on the coordinate points to obtain the fitting curve f(t).

[0023] As a further solution of the present invention: in the process of calculating the average demand power of the load at the same time node, the average demand power of the load at time node b is obtained , when the demand power of the load at time node b within the Bth collection period , the demand power of the load at time node b within the Bth collection period is removed , and the average demand power of the load at time node b is calculated again, represents a preset difference threshold.

[0024] As a further solution of the present invention: in step S1, the process of determining the aging degree score specifically includes:

[0025] Collect the aging degree parameters of a single energy storage unit. The aging degree parameters include capacity attenuation, internal resistance, and charge and discharge efficiency, and calculate the aging degree score of the energy storage unit based on the technique for order preference by similarity to ideal solution (TOPSIS).

[0026] A control system for a parallel energy storage power supply, comprising:

[0027] The first energy supply module: obtains the aging degree score k of a single energy storage unit, calculates the maximum output power of the energy storage unit , pys represents the rated output power of the energy storage unit, calculates the target output power P = 0.9p, sorts the target output power in ascending order to obtain the first sorting;

[0028] Determine the first target sorting position X1 in the first sorting. The first target sorting position X1 satisfies the constraint: and , FSJ represents the actual demand power of the load at the current time on the load, represents the sum of the first X1 target output powers, represents the sum of the first X1 - 1 target output powers;

[0029] The energy storage units corresponding to the first X1 - 1 target output powers in the first sorting supply energy at their respective corresponding target output powers, and the energy storage unit corresponding to the X1th target output power in the first sorting supplies energy with a first power difference as the output power;

[0030] The analysis module: substitutes the next time node adjacent to the current time into the preset fitting curve f(t) to obtain the predicted demand power FYC, t represents time, calculates the power to be adjusted PAF = FYC - FSJ, determines the second target sorting position X2 in the first sorting. The second target sorting position X2 satisfies the constraint: and ;

[0031] Descendingly sort the target output powers whose sorting positions in the first sorting belong to the first sorting position interval [1, X2] to obtain a second sorting, and calculate the second power difference , determine the third target sorting position X3 in the second sorting based on the power difference, and the third target sorting position X3 satisfies the constraint: and ;

[0032] The second power supply module: respectively determine the rising unit and the falling unit based on the second target sorting position X2 and the third target sorting position X3, and adjust the output powers of the rising unit and the falling unit.

[0033] Advantages of the present invention: In this solution, first calculate the maximum available output power p of the energy storage unit according to the aging degree and rated power of the energy storage unit, and determine the target output power P. By considering the aging score k, factorize the maximum output power of the energy storage unit to ensure that each unit outputs power within its safety and capacity range, thereby extending the unit life and improving the overall reliability of the system. Then, ascendingly sort the target output powers of all energy storage units to find the minimum number of units X1 that meets the actual demand power FSJ at the current moment, which can minimize waste and redundant output in the supply-demand matching; afterwards, according to the predicted load power FYC at the next moment, by using the predicted power FYC to pre-deploy the adjustment plan (PAF) at the current moment, the system can layout in advance for the upcoming power change, so as to achieve output adjustment more quickly and gently at the next moment; calculate the power PAF that needs to be adjusted, PAF = FYC - FSJ. On the premise of meeting the PAF increment demand, by finding the second target sorting position X2 in the first sorting, first satisfy the current power through X1, and then expand the supply capacity through X2, laying a foundation for the flexible scheduling of the subsequent rising and falling powers. Quadratically sort (descendingly) the first X2 target output power units to find the units that are most potential or easiest to allocate when increasing / decreasing power, making the regulation more refined; re-sort the target output powers in the interval [1, X2] in descending order, and finally determine the units that need to partially reduce power according to the power difference and X3, and make the regulation more refined by subdividing the power unit sorting and precisely quantifying the adjustment , it can avoid severe output fluctuations caused by sudden demand changes at the next moment and ensure the stable operation of the system. Finally, a phased power change rate control is applied to the rising unit and the falling unit. By gradually increasing the output power of the rising unit and gradually decreasing the output power of the falling unit, the final power adjustment can smoothly transition to the required predicted power level. By setting the average rising speed and the rising and falling speed strategies for multiple stages, fine-grained control of the output power is achieved. First, the power is distributed at a single balanced rising speed, and then the rising speed is dynamically adjusted according to the number of units that have not reached the target power. When a unit reaches the target power or a falling unit drops to 0, the speed is redistributed again to ensure that the overall adjustment process is stable and orderly. This progressive increase and decrease in power reduces the transient stress on the energy storage unit, reduces component wear, heat generation, and efficiency loss caused by sudden severe power changes, and helps to extend the life of the energy storage unit and improve energy utilization efficiency. Through continuous dynamic optimization and balance of power according to the aging situation and load prediction, this solution provides a practical idea for how to utilize the remaining capacity of existing energy storage units (even if they are aging) to meet the demand in actual engineering, and helps to improve the rationality and effectiveness of overall power distribution in the context of aging. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below with reference to the accompanying drawings.

[0035] Figure 1 is a schematic flowchart of a control method for a parallel energy storage power supply according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0037] Please refer to Figure 1 shown, the present invention is a control method for a parallel energy storage power supply, including the following steps:

[0038] S1: Obtain the aging degree score k of a single energy storage unit, and calculate the maximum output power of the energy storage unit , pys represents the rated output power of the energy storage unit, calculate the target output power P = 0.9p, and perform an ascending order sorting on the target output power to obtain the first sorting;

[0039] In a preferred embodiment of the present invention, the process of determining the aging degree score specifically includes:

[0040] Collect the aging degree parameters of a single energy storage unit. The aging degree parameters include capacity attenuation, internal resistance, and charge-discharge efficiency, and calculate the aging degree score of the energy storage unit based on the Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS).

[0041] Among them, the capacity attenuation represents the ratio of the current capacity to the rated capacity, the charge-discharge efficiency represents the ratio of the discharge capacity to the charge capacity, and the Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS) is a commonly used multi-index decision-making analysis method. This method transforms the multi-dimensional and multi-attribute decision-making problem into an easily comparable comprehensive evaluation problem by simultaneously considering the distances between each scheme and the ideal optimal scheme (positive ideal solution) and the worst scheme (negative ideal solution). Since the application of the Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS) is relatively mature, it will not be described in detail here;

[0042] Determine the first target sorting position X1 in the first sorting. The first target sorting position X1 satisfies the constraint: And , where FSJ represents the actual demand power of the load at the current time of the load, represents the sum of the first X1 target output powers, represents the sum of the first X1 - 1 target output powers;

[0043] The energy storage units corresponding to the first X1 - 1 target output powers in the first sorting supply energy at their respective corresponding target output powers, and the energy storage unit corresponding to the X1th target output power in the first sorting supplies energy at the first power difference as the output power;

[0044] It should be noted that by sorting the target output powers of all energy storage units in ascending order, the minimum number of units X1 that meets the actual demand power FSJ at the current moment is found, which can minimize waste and redundant output in the supply-demand matching.

[0045] S2: Substitute the next time node adjacent to the current time into the preset fitting curve f(t) to obtain the predicted demand power FYC, where t represents time, calculate the power to be adjusted PAF = FYC - FSJ, and determine the second target sorting position X2 in the first sorting. The second target sorting position X2 satisfies the constraint: And ;

[0046] In a preferred embodiment of the present invention, the process of determining the fitting curve specifically includes:

[0047] Set m monitoring periods, where m is a preset number, and at a preset time interval Set a number of time nodes, obtain the required power of the load at the time nodes, calculate the average required power of the load at the same time node, and generate coordinate points (a, F a ), F a represents the average required power corresponding to the time node a, and fit the coordinate points to obtain a fitting curve f(t);

[0048] In a preferred case of this embodiment, during the process of calculating the average required power of the load at the same time node, obtain the average required power of the load at the time node b , when the required power of the load at the time node b in the Bth acquisition period , remove the required power of the load at the time node b in the Bth acquisition period , and recalculate the average required power of the load at the time node b, represents a preset difference threshold;

[0049] When calculating the average required power at the same time node, if the required power of the load in a certain acquisition period deviates too much from the average value (exceeding the preset threshold ), it indicates that this data point may be an atypical value caused by special events, faults, sudden anomalies, etc. By removing these abnormal data points and recalculating the average value, the influence of noise and outliers on the average result can be effectively reduced, so that the finally obtained fitting curve is smoother, more accurate and representative.

[0050] In a preferred embodiment of the present invention, when the power PAF to be adjusted is less than 0, the following steps are performed:

[0051] Determine the fourth target sorting position X4 in the second sorting, and the fourth target sorting position satisfies the constraint: and , and use the energy storage units corresponding to the target output power whose sorting positions in the second sorting belong to the third sorting position interval [1, X4] as the second descending units;

[0052] Each of the second descending units reduces the output power at a target descending speed , until the output power of a certain second descending unit is 0, and each descending unit reduces the output power at a first target descending speed to reduce the output power, represents the total number of second descending units with non-zero output power, and repeat the above steps until the total descending output power of the second descending units reaches the absolute value of the power to be adjusted;

[0053] When the power to be adjusted PAF is less than 0, it indicates that the load demand in subsequent moments will decrease, and the output power of the energy storage unit needs to be correspondingly reduced. By determining the fourth target sorting position X4 and selecting the energy storage units within the corresponding interval as the "second decreasing units", a group of units with power reduction capabilities can be accurately found, and their total reducible power just reaches the magnitude to meet the demand change (|PAF|);

[0054] When the power of a unit has dropped to 0, by recalculating the decreasing speed and distributing it to the remaining units with power reduction space, it can be ensured that during the decreasing process, each unit is in a relatively balanced power reduction state. This can not only ensure the flexibility of regulation but also avoid the situation of excessive wear or impact on the load of individual units;

[0055] Perform a descending sort on the target output powers with sorting positions within the first sorting position interval [1, X2] in the first sort to obtain the second sort, and calculate the second power difference , determine the third target sorting position X3 in the second sort based on the power difference, and the third target sorting position X3 satisfies the constraint: and ;

[0056] In another preferred embodiment of the present invention, when the power to be adjusted is equal to 0 and / or the second power difference is equal to 0, the subsequent steps of adjusting the output powers of the increasing units and decreasing units are not executed;

[0057] It can be understood that when the power to be adjusted is equal to 0 and / or the second power difference is equal to 0, it means that the current power distribution has reached the expected target and there is no need to further fine-tune the output power;

[0058] S3: Determine the increasing units and decreasing units respectively based on the second target sorting position X2 and the third target sorting position X3, and adjust the output powers of the increasing units and decreasing units;

[0059] In a preferred embodiment of the present invention, the process of adjusting the output powers of the increasing units and decreasing units specifically includes:

[0060] Take the energy storage units corresponding to the target output powers with sorting positions within the second sorting position interval [X1, X2] in the first sort as the increasing units, and calculate the average increasing speed , and each of the increasing units increases the output power at the first increasing speed until the output power of a certain increasing unit reaches the corresponding target output power, and then each of the increasing units increases the output power at the second increasing speed ; The total number of rising units whose output power does not reach the corresponding target output power, repeating the above steps until the total output power of the rising units reaches the power to be adjusted PAF;

[0061] The energy storage units corresponding to the first X3 target output powers in the second ranking are used as descending units, and each descending unit descends at a first descending speed. The output power is reduced until the output power of a certain decreasing unit is 0, and the single decreasing unit is reduced at the second decreasing speed. Reduce output power, Indicates the total number of decreasing units whose output power is not 0, repeating the above steps until the total decreasing output power of the decreasing units reaches the power to be adjusted PAF;

[0062] By setting the average rising speed and the rising and falling speed strategies for multiple stages, fine-grained control of the output power is achieved. The power is first allocated at a single balanced rising speed, and then the rising speed is dynamically adjusted according to the number of units that have not reached the target power. When a unit reaches the target power or a declining unit drops to 0, the speed is redistributed to ensure that the overall adjustment process is smooth and orderly. This gradual increase and decrease in power reduces the transient stress on the energy storage unit, reduces component wear, heat and efficiency loss caused by instantaneous and drastic power changes, and helps to extend the life of the energy storage unit and improve energy utilization efficiency.

[0063] A control system for parallel energy storage power supplies, comprising:

[0064] The first energy supply module: obtains the aging degree score k of a single energy storage unit and calculates the maximum output power of the energy storage unit , pys represents the rated output power of the energy storage unit, calculates the target output power P=0.9p, and sorts the target output power in ascending order to obtain a first sort;

[0065] Determine a first target sorting position X1 in the first sorting, and the first target sorting position X1 satisfies the constraint: and , FSJ represents the current time The actual power demand of the load, represents the sum of the output powers of the first X1 targets, It represents the sum of the output powers of the first X1-1 targets;

[0066] The energy storage units corresponding to the first X1-1 target output powers in the first ranking supply energy at their respective corresponding target output powers, and the energy storage unit corresponding to the X1th target output power in the first ranking supplies energy at the first power difference. Providing energy for output power;

[0067] Analysis module: Substitute the next time node adjacent to the current time into the preset fitting curve f(t) to obtain the predicted demand power FYC, where t represents time, calculate the power to be adjusted PAF = FYC - FSJ, and determine the second target sorting position X2 in the first sorting. The second target sorting position X2 satisfies the constraint: and and ;

[0068] Descendingly sort the target output powers in the first sorting whose sorting positions belong to the first sorting position interval [1, X2] to obtain the second sorting, and calculate the second power difference , and determine the third target sorting position X3 in the second sorting based on the power difference. The third target sorting position X3 satisfies the constraint: and ;

[0069] Second energy supply module: Determine the rising unit and the falling unit respectively based on the second target sorting position X2 and the third target sorting position X3, and adjust the output powers of the rising unit and the falling unit.

[0070] The above has described an embodiment of the present invention in detail, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the present invention application shall still fall within the scope covered by the patent of the present invention.

Claims

1. A control method for parallel energy storage power supply, characterized in that: The following steps are involved: S1: Obtain the aging score k of a single energy storage unit and calculate the maximum output power of the energy storage unit , pys represents the rated output power of the energy storage unit, calculates the target output power P=0.9p, and sorts the target output power in ascending order to obtain a first sort; Determine a first target sorting position X1 in the first sorting, and the first target sorting position X1 satisfies the constraint: and , FSJ represents the current time The actual power demand of the load, represents the sum of the output powers of the first X1 targets, It represents the sum of the output powers of the first X1-1 targets; The energy storage units corresponding to the first X1-1 target output powers in the first ranking supply energy at their respective corresponding target output powers, and the energy storage unit corresponding to the X1th target output power in the first ranking supplies energy at the first power difference. Providing energy for output power; S2: will be with the current time The next adjacent time node Substitute the preset fitting curve The predicted demand power FYC is obtained, t represents time, the power to be adjusted PAF=FYC-FSJ is calculated, and the second target sorting position X2 in the first sorting is determined. The second target sorting position X2 satisfies the constraint: ; The target output powers whose sorting positions in the first sorting are within the first sorting position interval [1, X2] are sorted in descending order to obtain a second sorting, and the second power difference is calculated. , based on the second power difference, a third target sorting position X3 in the second sorting is determined, and the third target sorting position X3 satisfies the constraint: and ; S3: determining an ascending unit and a descending unit based on the second target sorting position X2 and the third target sorting position X3 respectively, adjusting the output power of the ascending unit to increase, and adjusting the output power of the descending unit to decrease; The energy storage unit corresponding to the target output power whose sorting position in the first sorting belongs to the second sorting position interval [X1, X2] is used as the rising unit; The energy storage units corresponding to the first X3 target output powers in the second ranking are used as descending units.

2. A control method for parallel energy storage power supply according to claim 1, characterized in that: In the step S3, the process of adjusting the output power of the increasing unit to increase and adjusting the output power of the decreasing unit to decrease specifically includes: Calculate average ascent speed , the single ascending unit rises at a first ascending speed Increase the output power until the output power of a certain rising unit reaches the corresponding target output power, and the remaining rising units increase the output power at the second rising speed. Increase output power, The total number of rising units whose output power does not reach the corresponding target output power, repeating the above steps until the total output power of the rising units reaches the power to be adjusted PAF; The single descending unit descends at a first speed. The output power is reduced until the output power of a certain decreasing unit is 0, and the output power of the remaining decreasing units is reduced at the second decreasing speed. Reduce output power, The total number of decreasing units whose output power is not 0 is represented, and the above steps are repeated until the total decreasing output power of the decreasing units reaches the power to be adjusted PAF.

3. A control method for parallel energy storage power supply according to claim 1, characterized in that: In the step S2, when the power to be adjusted PAF is less than 0, the following steps are performed: Determine a fourth target sorting position X4 in the second sorting, and the fourth target sorting position satisfies the constraint: , taking the energy storage unit corresponding to the target output power whose sorting position in the second sorting belongs to the third sorting position interval [1, X4] as the second descending unit; The second descending unit is arranged at a target descending speed. The output power is reduced until the output power of a second decreasing unit is 0, and the output power of the remaining decreasing units is reduced at the first target decreasing speed. Reduce output power, The total number of second decreasing units whose output power is not 0 is represented, and the above steps are repeated until the total decreased output power of the second decreasing units reaches the absolute value of the power to be adjusted.

4. A control method for parallel energy storage power supply according to claim 1, characterized in that: In the step S2, when the power to be adjusted is equal to 0, the subsequent steps of adjusting the output power of the increasing unit to increase and the steps of adjusting the output power of the decreasing unit to decrease are not executed; when the second power difference is equal to 0, only the subsequent steps of adjusting the output power of the increasing unit to increase are executed.

5. A control method for parallel energy storage power sources according to claim 1, characterized in that: In step S2, the process of determining the fitting curve specifically includes: Set m monitoring cycles, where m is a preset number, and within the monitoring cycle, at preset time intervals Set several time nodes, obtain the required power of the load at the time nodes, calculate the average required power of the load at the same time nodes, and generate coordinate points , represents the average required power corresponding to the time node a, and the coordinate points are fitted to obtain the fitting curve f(t).

6. A control method for parallel energy storage power sources according to claim 5, characterized in that: In the process of calculating the average power demand of the load at the same time node, the average power demand of the load at time node b is obtained , when the required power of the load on node b during the Bth monitoring period When the power demand of the load on node b in the Bth monitoring period is removed, , and calculate the average required power of the load at time node b again, Indicates the preset difference threshold.

7. A control method for parallel energy storage power sources according to claim 1, characterized in that: In the step S1, the process of determining the aging degree score specifically includes: The aging degree parameters of a single energy storage unit are collected, wherein the aging degree parameters include capacity attenuation, internal resistance and charge and discharge efficiency, and the aging degree score of the energy storage unit is calculated based on the superior and inferior solution distance method.

8. A control system for parallel energy storage power sources, characterized in that: include: The first energy supply module: obtains the aging degree score k of a single energy storage unit and calculates the maximum output power of the energy storage unit , pys represents the rated output power of the energy storage unit, calculates the target output power P=0.9p, and sorts the target output power in ascending order to obtain a first sort; Determine a first target sorting position X1 in the first sorting, and the first target sorting position X1 satisfies the constraint: , FSJ represents the current time The actual power demand of the load, represents the sum of the output powers of the first X1 targets, It represents the sum of the output powers of the first X1-1 targets; The energy storage units corresponding to the first X1-1 target output powers in the first ranking supply energy at their respective corresponding target output powers, and the energy storage unit corresponding to the X1th target output power in the first ranking supplies energy at the first power difference. Providing energy for output power; Analysis module: will be with the current time The next adjacent time node Substitute the preset fitting curve f(t) to obtain the predicted demand power FYC, t represents time, calculate the power to be adjusted PAF=FYC-FSJ, and determine the second target sorting position X2 in the first sorting. The second target sorting position X2 satisfies the constraint: ; The target output powers whose sorting positions in the first sorting are within the first sorting position interval [1, X2] are sorted in descending order to obtain a second sorting, and the second power difference is calculated. , based on the second power difference, a third target sorting position X3 in the second sorting is determined, and the third target sorting position X3 satisfies the constraint: ; The second energy supply module determines the ascending unit and the descending unit based on the second target sorting position X2 and the third target sorting position X3, respectively, and adjusts the output power of the ascending unit to increase, and adjusts the output power of the descending unit to decrease; The energy storage unit corresponding to the target output power whose sorting position in the first sorting belongs to the second sorting position interval [X1, X2] is used as the rising unit; The energy storage units corresponding to the first X3 target output powers in the second ranking are used as descending units.

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