Hybrid energy storage frequency modulation method and system based on two-dimensional mode decomposition

Abstract

The hybrid energy storage frequency modulation method based on two-dimensional mode decomposition comprises the following steps: acquiring an original frequency modulation instruction signal; generating a primary modal subsequence according to the frequency modulation instruction signal based on a two-dimensional modal decomposition algorithm; generating a plurality of secondary modal subsequences from the undecomposed frequency modulation instruction signal based on a two-dimensional modal decomposition algorithm through loop iteration; distributing the primary modal sub-sequence and the plurality of secondary modal sub-sequences to different energy storage units in the hybrid energy storage system for power regulation and control; when the power grid frequency of the power plant fluctuates, response can be made in time, the optimal decomposition sub-sequence is obtained through the two-dimensional mode decomposition algorithm, frequency modulation instruction distribution is more accurate, the problem of inaccurate frequency modulation instruction signal distribution caused by mode aliasing is solved, the cost of an energy storage system is reduced, and the income of the power plant is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power grid frequency regulation, and in particular to a hybrid energy storage frequency regulation method and system with two-dimensional modal decomposition. Background Art

[0002] At present, in major regional power grids in my country, large hydropower and thermal power units (coal-fired units / gas-fired units) are mainly used as power grid frequency regulation power sources. The frequency regulation power output is adjusted to respond to system frequency changes. However, hydropower and thermal power units have certain limitations in frequency regulation. In recent years, the increase in the proportion of new energy power generation such as wind power and solar power has led to a large number of thermal power units bearing heavy AGC regulation tasks for a long time, resulting in a series of negative effects such as increased coal consumption for power generation and serious equipment wear. The existing power frequency regulation resources can no longer meet the demand for renewable energy access to the grid. The hybrid energy storage system with supercapacitors participates in the coordinated control of primary frequency regulation. By dividing the typical working conditions, the frequency deviation is converted to power according to the optimization decision module, and the charge / discharge control of the supercapacitor energy storage system is realized through the PCS system control module, and finally assists the traditional generator set to complete the primary frequency regulation process. Within the rated power range, the specified power output can be completed within 1s with an accuracy of more than 99%. Its comprehensive response capability fully meets the power conversion requirements within the time scale of AGC frequency regulation, which greatly exceeds the regulation capacity of conventional thermal power plants. The more urgent the system's regulation needs, the more obvious the advantages of this technology.

[0003] The hybrid energy storage system based on the above-mentioned supercapacitor energy storage usually uses VMD algorithm to realize the distribution of frequency modulation signals. The traditional frequency modulation method of hybrid energy storage (supercapacitor + lithium battery) to assist thermal power units is to pass the difference between the frequency modulation instruction and the thermal power unit to the hybrid energy storage, and use VMD decomposition technology to decompose the original signal into K subsequences IMF1 to IMFK, of which the low-frequency part is borne by the battery and the high-frequency part is borne by the supercapacitor. VMD is an adaptive, completely non-recursive modal variation and signal processing method. This technology has the advantage of being able to determine the number of modal decompositions. Its adaptability is reflected in determining the number of modal decompositions of a given sequence according to actual conditions. In the subsequent search and solution process, the optimal center frequency and limited bandwidth of each mode can be adaptively matched, and the effective separation of the intrinsic modal component (IMF) and the frequency domain division of the signal can be achieved, thereby obtaining the effective decomposition components of the given signal, and finally obtaining the optimal solution to the variation problem. The decomposition obtains a relatively stable subsequence containing multiple different frequency scales, which is suitable for non-stationary sequences. However, the traditional VMD decomposition technology has the problem of modal aliasing. For example, a modal component IMFi may contain both high-frequency components and low-frequency components, which is not conducive to the power allocation of batteries and supercapacitors. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to propose a hybrid energy storage frequency modulation method and system with two-dimensional modal decomposition.

[0005] A hybrid energy storage frequency modulation method with two-dimensional modal decomposition, characterized by comprising the steps of: S101, obtaining an original frequency modulation command signal; S102, generating a primary modal subsequence according to the frequency modulation instruction signal based on a two-dimensional modal decomposition algorithm; in the two-dimensional modal decomposition algorithm, first generating a first group of subsequences based on the frequency modulation instruction; checking two dimensional conditions of the subsequences; if the generated subsequences cannot simultaneously meet the conditions of the amplitude dimension and the frequency dimension, regenerating the first group of subsequences; rechecking the first group of subsequences until the conditions of the amplitude dimension and the frequency dimension are met; and finally generating a subsequence; S103, generating a plurality of secondary modal subsequences based on a two-dimensional modal decomposition algorithm through cyclic iteration from the undecomposed frequency modulation instruction signal; S104, allocating the primary modal subsequence and several secondary modal subsequences to different energy storage units in the hybrid energy storage system for power regulation.

[0006] Further, Assume the frequency modulation instruction is Pt=[X1,X2,X3,...,X i ,...,X N ], the first group of subsequences generated based on the frequency modulation instruction is, IMF1=[x 11 ,x 12 ,...,x 1i ,...,x 1N ], Each value in IMF1 is generated as follows:

[0007] rand() is a random function, and max() is used to find the maximum value.

[0008] Further, The first set of sequences generated must satisfy the following two conditions: Verify the amplitude dimension: ; Check frequency dimension: Let ,make , Then a frequency sequence is generated

[0009] The frequency sequence requirements are: , avg() is for finding the average value, and max() is for finding the maximum value.

[0010] Further, In step S103, Subtracting the primary modal subsequence generated by the two-dimensional modal decomposition algorithm from the original frequency modulation command signal to obtain an undecomposed frequency modulation command signal; Determining whether the undecomposed frequency modulation command signal sequence and the original frequency modulation command signal meet a predetermined condition; If the predetermined conditions are not met, a two-dimensional modal decomposition algorithm is iteratively used to generate several groups of subsequences for the undecomposed frequency modulation instruction signal, and the decomposition is stopped when the predetermined conditions are met.

[0011] Further, The undecomposed frequency modulation command signal Pt-IMF1 sequence is [X1-x 11 ,X2-x 12 ,X3-x 13 ,...,X i -x 1i ,...,X N -x 1N ]sequence; This cycle repeats until the Kth group of sequences is generated. The undecomposed frequency modulation command signal sequence is Pt-(IMF1+IMF2+...+IMF K ).

[0012] Further, Undecomposed frequency modulation command signal sequence Pt-(IMF1+IMF2+...+IMF K ) stops decomposition when the original frequency modulation command signal Pt meets the following conditions: , gelu() is the activation function.

[0013] Further, In step S104, Obtaining the primary modal subsequence and several iteratively generated secondary modal subsequences, including all K+1 subsequences generated when the decomposition is stopped; All K+1 subsequences are divided into a low-frequency part and a high-frequency part according to a predetermined ratio. The low-frequency part is allocated to the battery, and the high-frequency part is allocated to the overcapacity.

[0014] Further, The front part [30%K] of all K+1 subsequences is the low-frequency part, and the rest is the high-frequency part; [] indicates rounding.

[0015] A hybrid energy storage frequency modulation system with two-dimensional modal decomposition is also provided, characterized in that it includes: A command acquisition module, which acquires the original frequency modulation command signal; A two-dimensional modal decomposition module generates a primary modal subsequence according to the frequency modulation instruction signal based on a two-dimensional modal decomposition algorithm; in the two-dimensional modal decomposition algorithm, firstly generates a first group of subsequences based on the frequency modulation instruction; verifies two dimensional conditions of the subsequences; if the generated subsequences cannot simultaneously meet the conditions of the amplitude dimension and the frequency dimension, then regenerates the first group of subsequences; re-verifies the first group of subsequences until the conditions of the amplitude dimension and the frequency dimension are met; and finally generates a subsequence; And the undecomposed frequency modulation command signal is used to generate several secondary modal subsequences based on the two-dimensional modal decomposition algorithm through cyclic iteration; The power distribution module distributes the primary modal subsequence and several secondary modal subsequences to different energy storage units in the hybrid energy storage system for power regulation.

[0016] The beneficial effects of the present invention are: The present disclosure provides a hybrid energy storage frequency modulation method and system with two-dimensional modal decomposition, which can respond in time when the power plant grid frequency fluctuates, obtain the optimal decomposition subsequence through a two-dimensional modal algorithm, and thus make the frequency modulation instruction allocation more accurate, solve the problem of inaccurate frequency modulation instruction signal allocation caused by modal aliasing, reduce the cost of the energy storage system, and improve the power plant's revenue. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A diagram of the method steps.

[0018] Figure 2 This is a flow chart of FM signal decomposition and distribution.

[0019] Figure 3 This is the flow chart of the two-dimensional mode decomposition algorithm. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] It should be understood that the step numbers used in this document are only for convenience of description and are not intended to limit the order in which the steps are executed.

[0022] It should be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0023] The terms “include” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0024] The term "and / or" means and includes any and all possible combinations of one or more of the associated listed items.

[0025] The present disclosure provides a hybrid energy storage frequency modulation method with two-dimensional modal decomposition, such as Figure 1 As shown, including: S101, obtaining an original frequency modulation command signal; S102, generating a primary modal subsequence according to the frequency modulation instruction signal based on a two-dimensional modal decomposition algorithm; in the two-dimensional modal decomposition algorithm, first generating a first group of subsequences based on the frequency modulation instruction; checking two dimensional conditions of the subsequences; if the generated subsequences cannot simultaneously meet the conditions of the amplitude dimension and the frequency dimension, regenerating the first group of subsequences; rechecking the first group of subsequences until the conditions of the amplitude dimension and the frequency dimension are met; and finally generating a subsequence; S103, generating a plurality of secondary modal subsequences based on a two-dimensional modal decomposition algorithm through cyclic iteration from the undecomposed frequency modulation instruction signal; S104, allocating the primary modal subsequence and several secondary modal subsequences to different energy storage units in the hybrid energy storage system for power regulation.

[0026] The frequency modulation method based on supercapacitor energy storage provided by the embodiment of the present disclosure uses new supercapacitors and lithium batteries as energy storage devices and modulates the frequency of the power grid in the power plant when the frequency fluctuates. The state of the power grid of the power plant is monitored in real time. When the power supply frequency in the power grid of the power plant fluctuates, a corresponding frequency modulation command signal is generated. After the signal is obtained, the frequency of the power grid of the power plant is modulated by obtaining the modal subsequences of each level through the two-dimensional modal decomposition algorithm.

[0027] In another embodiment provided by the present disclosure, Figure 3As shown, the above step "S102, generating a primary modal subsequence according to the frequency modulation instruction signal based on a two-dimensional modal decomposition algorithm; in the two-dimensional modal decomposition algorithm, first generating a first group of subsequences based on the frequency modulation instruction; checking two dimensional conditions of the subsequences; if the generated subsequences cannot simultaneously meet the conditions of the amplitude dimension and the frequency dimension, regenerating the first group of subsequences; rechecking the first group of subsequences until the conditions of the amplitude dimension and the frequency dimension are met; and finally generating a subsequence;" includes: Step 1: Assume the frequency modulation command is Pt=[X1,X2,X3,...,X i ,...,X N ], the present application adopts the two-dimensional decomposition method, and the first group of subsequences generated based on the frequency modulation instruction is, IMF1=[x 11 ,x 12 ,...,x 1i ,...,x 1N ], Each value in IMF1 is generated as follows: .

[0028] Where rand() is a random function.

[0029] Step 2: Verify the two-dimensional conditions of the subsequence The first set of sequences generated must meet the following two conditions: Verify the amplitude dimension formula 1): ; When checking the first set of sequences, the denominator X i That is X1, and the numerator is for x 11 ,x 12 ,...,x 1i ,...,x 1N All verifications must be calculated.

[0030] Check frequency dimension formula 2): Let ,make , The x i 、x i+1 The frequency modulation instruction Pt=[X1,X2,X3,...,X i ,...,X N ] in the command values.

[0031] Then a frequency sequence is generated

[0032] The frequency sequence requirements are: , where avg() is for finding the average value and max() is for finding the maximum value.

[0033] Step 3: If the generated subsequence cannot satisfy the conditions of amplitude dimension and frequency dimension at the same time, IMF1 is regenerated; Each value in IMF1 is generated as follows: .

[0034] Where rand() is a random function.

[0035] Recheck IMF1 until the conditions of amplitude dimension and frequency dimension are met.

[0036] Finally, the subsequence IMF1 is generated; IMF1=[x 11 ,x 12 ,...,x 1i ,...,x 1N ] In another embodiment provided by the present disclosure, Figure 2 As shown, the above step "S103, generating a plurality of secondary modal subsequences based on a two-dimensional modal decomposition algorithm through cyclic iteration of the undecomposed frequency modulation instruction signal" includes: Step 1: Obtain an undecomposed frequency modulation command signal. Subtract the generated subsequence IMF1 from the original frequency modulation command signal to obtain an undecomposed frequency modulation command signal Pt-IMF1 sequence. That is, [X1-x 11 ,X2-x 12 ,X3-x 13 ,...,X i -x 1i ,...,X N -x 1N ]sequence.

[0037] Step 2: Continue to use the two-dimensional decomposition method to generate the second group of subsequences for the Pt-IMF1 sequence. IMF2=[x 21 ,x 22 ,...,x 2i ,...,x 2N ], which also needs to verify the conditions of amplitude dimension and frequency dimension.

[0038] When checking the amplitude dimension and frequency dimension, use [X1-x 11 ,X2-x 12 ,X3-x 13 ,...,X i -x 1i,...,X N -x 1N ] sequence instead of the original [X1,X2,X3,...,X i ,...,X N ]Substitute the instruction values ​​of the sequence into formula 1) and formula 2) for verification operation.

[0039] Step 3: Iteratively obtain the undecomposed frequency modulation command signal and generate several groups of sequences.

[0040] Continue to obtain the sequence of undecomposed frequency modulation command signals Pt-IMF1-IMF2, That is, [X1-x 11 -x 21 ,X2-x 12 -x 22 ,X3-x 13 -x 23 ,...,X i -x 1i -x 2i ,...,X N -x 1N -x 2N ]sequence.

[0041] The two-dimensional decomposition method is continued to be used for the Pt-IMF1-IMF2 sequence to generate the third group of subsequences and perform two-dimensional verification.

[0042] This cycle repeats until the Kth group of sequences is generated. The undecomposed frequency modulation command signal sequence Pt-(IMF1+IMF2+...+IMF K ) stops decomposition when the original frequency modulation command signal Pt meets the following conditions: , gelu() is the activation function.

[0043] Among them, for [X1,X2,X3,...,X i ,...,X N ]All instruction values ​​in the sequence are calculated and verified.

[0044] In another embodiment provided by the present disclosure, the above step “S104, allocating the primary modal subsequence and the plurality of secondary modal subsequences to different energy storage units in the hybrid energy storage system for power regulation” includes: Step 1: Obtain the primary modal subsequence and several iteratively generated secondary modal subsequences, including all K+1 subsequences generated when the decomposition is stopped. IMF1,IMF2,IMF3,...,IMF K , Pt-(IMF1+IMF2+...+IMF K ).

[0045] Step 2: All K+1 subsequences are proportionally distributed.

[0046] All K+1 subsequences are divided into a low-frequency part and a high-frequency part according to a predetermined ratio. The low-frequency part is allocated to the battery, and the high-frequency part is allocated to the overcapacity.

[0047] The first part [30%K] of all K+1 subsequences is the low-frequency part, and the rest is the high-frequency part. [] indicates rounding.

[0048] With the above Figure 1 Corresponding to the method shown, the embodiment of the present disclosure also provides a hybrid energy storage frequency modulation system with two-dimensional modal decomposition, including: A command acquisition module, which acquires the original frequency modulation command signal; A two-dimensional modal decomposition module generates a primary modal subsequence according to the frequency modulation instruction signal based on a two-dimensional modal decomposition algorithm; in the two-dimensional modal decomposition algorithm, firstly generates a first group of subsequences based on the frequency modulation instruction; verifies two dimensional conditions of the subsequences; if the generated subsequences cannot simultaneously meet the conditions of the amplitude dimension and the frequency dimension, then regenerates the first group of subsequences; re-verifies the first group of subsequences until the conditions of the amplitude dimension and the frequency dimension are met; and finally generates a subsequence; And the undecomposed frequency modulation command signal is used to generate several secondary modal subsequences based on the two-dimensional modal decomposition algorithm through cyclic iteration; The power distribution module distributes the primary modal subsequence and several secondary modal subsequences to different energy storage units in the hybrid energy storage system for power regulation.

[0049] In order to further verify the advantages of the present invention, the present invention respectively adopts the two-dimensional decomposition method of the present invention and the VMD direct decomposition prediction method to predict the frequency modulation sequence, and the results are as follows. The performance of the present invention is better.

[0050]

[0051] Four evaluation indicators:

[0052] N represents the sample size, and Represent the actual value and predicted value at time n respectively.

[0053] An embodiment of the present disclosure provides a computer device, including: a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the computer device is running, the processor and the memory communicate via the bus, and when the machine-readable instructions are executed by the processor, the steps provided in any embodiment of the present disclosure are performed.

[0054] The computer device provided in the embodiment of the present application includes a processor, a memory, and a bus. The memory is used to store execution instructions, including internal memory and external memory; the internal memory here is also called internal memory, which is used to temporarily store the operation data in the processor and the data exchanged with the external memory such as the hard disk. The processor exchanges data with the external memory through the internal memory. When the electronic device is running, the processor and the memory communicate through the bus, so that the processor executes the following instructions: Obtaining the original frequency modulation command signal; Generate a primary modal subsequence according to the frequency modulation instruction signal based on a two-dimensional modal decomposition algorithm; in the two-dimensional modal decomposition algorithm, first generate a first group of subsequences based on the frequency modulation instruction; check the two dimensional conditions of the subsequence; if the generated subsequence cannot simultaneously meet the conditions of the amplitude dimension and the frequency dimension, regenerate the first group of subsequences; recheck the first group of subsequences until the conditions of the amplitude dimension and the frequency dimension are met; and finally generate a subsequence; The undecomposed frequency modulation command signal is used to generate several secondary modal subsequences based on a two-dimensional modal decomposition algorithm through cyclic iteration; The primary modal subsequence and several secondary modal subsequences are allocated to different energy storage units in the hybrid energy storage system for power regulation.

[0055] The embodiment of the present disclosure provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps provided in any embodiment of the present disclosure are executed. The storage medium may be a volatile or non-volatile computer-readable storage medium.

[0056] Through the description of the above implementation methods, those skilled in the art can clearly understand that the embodiments of the present disclosure can be implemented by hardware, or by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the embodiments of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a read-only CD, a USB flash drive, a mobile hard disk, etc.), including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present disclosure.

[0057] Those skilled in the art will appreciate that the accompanying drawings are merely schematic diagrams of a preferred embodiment, and the modules or processes in the accompanying drawings are not necessarily required for implementing the present disclosure.

[0058] Those skilled in the art can understand that the modules in the device in the embodiment can be distributed in the device in the embodiment according to the description of the embodiment, or can be changed accordingly and located in one or more devices different from the present embodiment. The modules in the above embodiment can be combined into one module, or can be further divided into multiple sub-modules.

[0059] The serial numbers of the above-mentioned embodiments of the present disclosure are only for description and do not represent the advantages or disadvantages of the embodiments.

[0060] Obviously, those skilled in the art can make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is also intended to include these modifications and variations.

[0061] Finally, it should be noted that the above description is only an explanation of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail, those skilled in the art can still modify the technical solutions described above or replace some of the technical features with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hybrid energy storage frequency modulation method with two-dimensional modal decomposition, characterized in that: Includes steps: S101, obtaining an original frequency modulation command signal; S102, generating a primary modal subsequence according to the frequency modulation instruction signal based on a two-dimensional modal decomposition algorithm; in the two-dimensional modal decomposition algorithm, first generating a first group of subsequences based on the frequency modulation instruction; checking two dimensional conditions of the subsequences; if the generated subsequences cannot simultaneously meet the conditions of the amplitude dimension and the frequency dimension, regenerating the first group of subsequences; rechecking the first group of subsequences until the conditions of the amplitude dimension and the frequency dimension are met; and finally generating a subsequence; S103, generating a plurality of secondary modal subsequences based on a two-dimensional modal decomposition algorithm through cyclic iteration from the undecomposed frequency modulation instruction signal; S104, allocating the primary modal subsequence and several secondary modal subsequences to different energy storage units in the hybrid energy storage system for power regulation.

2. The hybrid energy storage frequency modulation method with two-dimensional modal decomposition according to claim 1 is characterized in that: Assume the frequency modulation instruction is Pt=[X1,X2,X3,...,X i ,...,X N ], the first group of subsequences generated based on the frequency modulation instruction is, IMF1=[x 11 ,x 12 ,...,x 1i ,...,x 1N ], Each value in IMF1 is generated as follows: ， rand() is a random function, and max() is used to find the maximum value.

3. The hybrid energy storage frequency modulation method with two-dimensional modal decomposition according to claim 2 is characterized in that: The first set of sequences generated must satisfy the following two conditions: Verify the amplitude dimension: ; Check frequency dimension: Let ,make , Then a frequency sequence is generated The frequency sequence requirements are: , avg() is for finding the average value, and max() is for finding the maximum value.

4. The hybrid energy storage frequency modulation method with two-dimensional modal decomposition according to claim 2 is characterized in that: In step S103, Subtracting the primary modal subsequence generated by the two-dimensional modal decomposition algorithm from the original frequency modulation command signal to obtain an undecomposed frequency modulation command signal; Determining whether the undecomposed frequency modulation command signal sequence and the original frequency modulation command signal meet a predetermined condition; If the predetermined conditions are not met, a two-dimensional modal decomposition algorithm is iteratively used to generate several groups of subsequences for the undecomposed frequency modulation instruction signal, and the decomposition is stopped when the predetermined conditions are met.

5. The hybrid energy storage frequency modulation method with two-dimensional modal decomposition according to claim 4 is characterized in that: The undecomposed frequency modulation command signal Pt-IMF1 sequence is [X1-x 11 ,X2-x 12 ,X3-x 13 ,...,X i -x 1i ,...,X N -x 1N ]sequence; This cycle repeats until the Kth group of sequences is generated. The undecomposed frequency modulation command signal sequence is Pt-(IMF1+IMF2+...+IMF K ).

6. The hybrid energy storage frequency modulation method with two-dimensional modal decomposition according to claim 5 is characterized in that: Undecomposed frequency modulation command signal sequence Pt-(IMF1+IMF2+...+IMF K ) stops decomposition when the original frequency modulation command signal Pt meets the following conditions: , gelu() is the activation function.

7. The hybrid energy storage frequency modulation method with two-dimensional modal decomposition according to claim 1 is characterized in that: In step S104, Obtaining the primary modal subsequence and several iteratively generated secondary modal subsequences, including all K+1 subsequences generated when the decomposition is stopped; All K+1 subsequences are divided into a low-frequency part and a high-frequency part according to a predetermined ratio. The low-frequency part is allocated to the battery, and the high-frequency part is allocated to the overcapacity.

8. The hybrid energy storage frequency modulation method with two-dimensional modal decomposition according to claim 7 is characterized in that: The front part [30%K] of all K+1 subsequences is the low-frequency part, and the rest is the high-frequency part; [] indicates rounding.

9. A hybrid energy storage frequency modulation system with two-dimensional modal decomposition, characterized in that: include: A command acquisition module, which acquires the original frequency modulation command signal; A two-dimensional modal decomposition module generates a primary modal subsequence according to the frequency modulation instruction signal based on a two-dimensional modal decomposition algorithm; in the two-dimensional modal decomposition algorithm, firstly generates a first group of subsequences based on the frequency modulation instruction; verifies two dimensional conditions of the subsequences; if the generated subsequences cannot simultaneously meet the conditions of the amplitude dimension and the frequency dimension, then regenerates the first group of subsequences; re-verifies the first group of subsequences until the conditions of the amplitude dimension and the frequency dimension are met; and finally generates a subsequence; And the undecomposed frequency modulation command signal is used to generate several secondary modal subsequences based on the two-dimensional modal decomposition algorithm through cyclic iteration; The power distribution module distributes the primary modal subsequence and several secondary modal subsequences to different energy storage units in the hybrid energy storage system for power regulation.

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