Comprehensive control method and apparatus for power fluctuation-stabilizing energy storage system, and device

Abstract

A comprehensive control method and apparatus for a power fluctuation-stabilizing energy storage system, and a device, which relate to the technical field of energy storage systems and are applied to an integrated energy storage system of new energy power transmission. The integrated energy storage system of new energy power transmission comprises an integrated energy storage module. In the method, stabilizing power is calculated by means of empirical mode decomposition, so that the energy storage rated power requirement and the operational burden of the integrated energy storage system of new energy power transmission can be reduced in the operation of grid-connected power corresponding to the stabilizing power. An energy storage integrated control mode is used to control the integrated energy storage module to operate at an optimal depth of discharge, so that the cycle life of the integrated energy storage module is fully utilized, and the service life of the integrated energy storage module is prolonged, thereby solving the technical problems of low system operational efficiency and short service life of energy storage elements thereof in power fluctuation stabilizing processes of existing new energy power transmission systems.

Description

Comprehensive control method, device and equipment for smoothing power fluctuation energy storage system

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 8, 2023, with application number 202311157852.7 and invention name “Comprehensive control method, device and equipment for smoothing power fluctuation energy storage system”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of energy storage systems, and in particular to a comprehensive control method, device, and apparatus for smoothing power fluctuation energy storage systems. Background Art

[0003] Against the backdrop of achieving carbon peak and carbon neutrality, renewable energy, particularly wind power, has experienced rapid growth in recent years. Due to the randomness and volatility of wind power, the integration of renewable energy into the grid poses challenges to the safe and stable operation of the power system. Therefore, deploying energy storage systems with renewable energy to mitigate power fluctuations at the point of connection has become a research hotspot.

[0004] Considering the current high cost of energy storage systems, when applied to power fluctuation smoothing scenarios, the main factors affecting economic viability include energy storage capacity configuration, operating energy loss, and life loss. In terms of energy storage system capacity configuration and operating energy loss, since engineering configuration is mainly based on the energy storage ratio, it is mainly determined by the maximum power demand of the energy storage system, that is, the energy storage rated power. The energy storage system is used to absorb the difference between grid-connected power and wind power. Therefore, ensuring that the smoothed grid-connected power can better track the power while meeting the fluctuation mitigation requirements can effectively reduce the energy storage rated power and reduce the operating energy loss of the energy storage system. Currently, there is no good technical solution that meets these requirements. In addition, in the process of smoothing wind power fluctuations, the frequent charging and discharging switching of the energy storage system's energy storage elements (such as batteries) will affect their operating life. Although there is an existing dual-battery energy storage operation method based on independent charging and discharging mode, which effectively reduces this impact and extends the service life, and through data analysis, it is determined that the discharge depth with the best life extension effect is 0.8, that is, the state of charge (SOC) range of the energy storage element is 0.1-0.9, this mode is extremely sensitive to the imbalance of charging and discharging energy. Usually, the two energy storage elements cannot operate at the optimal discharge depth, resulting in insufficient utilization of the cycle life.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a comprehensive control method, device and equipment for a power fluctuation smoothing energy storage system, which is used to solve the technical problems of low system operating efficiency and short service life of its energy storage elements in the process of smoothing power fluctuations in existing new energy transmission systems.

[0007] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0008] On the one hand, a comprehensive control method for a power fluctuation smoothing energy storage system is provided, which is applied to an integrated energy storage system for renewable energy power transmission, wherein the integrated energy storage system for renewable energy power transmission includes an integrated energy storage module. The dual-layer energy storage power control method includes the following steps:

[0009] Obtain a topological structure diagram, total generated power, and initial value of modal decomposition order of an integrated energy storage system for renewable energy transmission, and construct a grid-connected power mathematical model based on the topological structure diagram; and add I Gaussian white noise to the total generated power to construct a power data set consisting of I data;

[0010] Calculating according to the initial value of the modal decomposition order using the primary modal decomposition calculation rule to obtain the primary modal component and the initial energy storage power; inputting the initial energy storage power into the grid-connected power mathematical model to obtain the initial fluctuation rate corresponding to the primary modal component at two time scales;

[0011] If the initial fluctuation rates under the two time scales meet the constraints, the initial energy storage power is used as the smoothing power of the integrated energy storage system for renewable energy transmission;

[0012] If the initial volatility at the two time scales does not meet the constraint conditions, the modal decomposition order is updated; the k-th modal decomposition calculation rule is used to calculate according to the modal decomposition order to obtain the order modal component and the energy storage power; the energy storage power is input into the grid-connected power mathematical model to obtain the updated volatility corresponding to the order modal component at the two time scales, until the updated volatility meets the constraint conditions, and the energy storage power corresponding to the updated volatility that meets the constraint conditions is used as the smoothing power of the integrated energy storage system for new energy power transmission;

[0013] An energy storage integrated control mode is adopted to control the integrated energy storage module to store the smoothing power.

[0014] Preferably, the integrated energy storage module includes a first energy storage element, a second energy storage element and a third energy storage element, and the contents of the energy storage integrated control mode include:

[0015] Acquire parameter data of the integrated energy storage module, the parameter data including charging rated power, discharging rated power, rated energy storage power, rated energy storage capacity, charging and discharging upper limit value, charging and discharging lower limit value, working efficiency parameter and power control period;

[0016] Calculating the charging power, discharging power, remaining amount of charging energy storage, and remaining amount of discharging energy storage of the integrated energy storage module based on the parameter data;

[0017] controlling the first energy storage element, the second energy storage element, and the third energy storage element to switch and store the smoothing power in thirteen operating conditions according to the charge and discharge upper limit, the charge and discharge lower limit, the charging power, and the discharging power;

[0018] The thirteen operating conditions include a first operating condition, a second operating condition, a third operating condition, a fourth operating condition, a fifth operating condition, a sixth operating condition, a seventh operating condition, an eighth operating condition, a ninth operating condition, a tenth operating condition, an eleventh operating condition, a twelfth operating condition and a thirteenth operating condition.

[0019] Preferably, controlling the first energy storage element, the second energy storage element, and the third energy storage element to switch and store the smoothing power in thirteen operating conditions according to the charge and discharge upper limit, the charge and discharge lower limit, the charging power, and the discharging power includes:

[0020] When the integrated energy storage module is in the first operating condition, a first energy storage capacity charged by the first energy storage element at the charging power and a first residual capacity discharged by the second energy storage element at the discharging power are obtained; if the first energy storage capacity reaches the upper charge and discharge limit, the integrated energy storage module switches to the second operating condition; if the first residual capacity reaches the lower charge and discharge limit, the integrated energy storage module switches to the third operating condition;

[0021] When the integrated energy storage module is in the second operating condition, a second energy storage capacity charged by the third energy storage element at the charging power and a second residual capacity discharged by the second energy storage element at the discharging power are obtained; if the second energy storage capacity reaches the upper charge and discharge limit, the integrated energy storage module switches to the fifth operating condition; if the second residual capacity reaches the lower charge and discharge limit, the integrated energy storage module switches to the fourth operating condition;

[0022] When the integrated energy storage module is in the third operating condition, a third energy storage capacity charged by the first energy storage element at the charging power and a third residual capacity discharged by the third energy storage element at the discharging power are obtained; if the third energy storage capacity reaches the upper charge and discharge limit, the integrated energy storage module switches to the sixth operating condition; if the third residual capacity reaches the lower charge and discharge limit, the integrated energy storage module switches to the seventh operating condition;

[0023] When the integrated energy storage module is in the fourth operating condition, a fourth energy storage capacity charged by the second energy storage element at the charging power and a fourth remaining capacity discharged by the first energy storage element at the discharging power are obtained; if the fourth energy storage capacity reaches the upper charge and discharge limit, the integrated energy storage module switches to the fifth operating condition; if the fourth remaining capacity reaches the lower charge and discharge limit, the integrated energy storage module switches to the eighth operating condition;

[0024] When the integrated energy storage module is in the fifth operating condition, a fifth energy storage capacity charged by the second energy storage element at the charging power and a fifth remaining capacity discharged by the first energy storage element at the discharging power are obtained; if the fifth energy storage capacity reaches the upper charge and discharge limit, the integrated energy storage module switches to the ninth operating condition; if the fifth remaining capacity reaches the lower charge and discharge limit, the integrated energy storage module switches to the eighth operating condition;

[0025] When the integrated energy storage module is in the sixth operating condition, a sixth energy storage capacity charged by the second energy storage element at the charging power and a sixth remaining capacity discharged by the third energy storage element at the discharging power are obtained; if the sixth energy storage capacity reaches the upper charge and discharge limit, the integrated energy storage module switches to the tenth operating condition; if the sixth remaining capacity reaches the lower charge and discharge limit, the integrated energy storage module switches to the seventh operating condition;

[0026] When the integrated energy storage module is in the seventh operating condition, a seventh energy storage capacity charged by the second energy storage element at the charging power and a seventh residual capacity discharged by the first energy storage element at the discharging power are obtained; if the seventh energy storage capacity reaches the upper charge and discharge limit, the integrated energy storage module switches to the tenth operating condition; if the seventh residual capacity reaches the lower charge and discharge limit, the integrated energy storage module switches to the eleventh operating condition;

[0027] When the integrated energy storage module is in the eighth operating condition, an eighth energy storage capacity charged by the second energy storage element at the charging power and an eighth residual capacity discharged by the third energy storage element at the discharging power are obtained; if the eighth energy storage capacity reaches the upper charge and discharge limit, the integrated energy storage module switches to the ninth operating condition; if the eighth residual capacity reaches the lower charge and discharge limit, the integrated energy storage module switches to the twelfth operating condition;

[0028] When the integrated energy storage module is in the ninth operating condition, a ninth energy storage quantity charged by the first energy storage element at the charging power and a ninth remaining quantity discharged by the third energy storage element at the discharging power are obtained; if the ninth energy storage quantity reaches the upper charge and discharge limit, the integrated energy storage module switches to the second operating condition; if the ninth remaining quantity reaches the lower charge and discharge limit, the integrated energy storage module switches to the twelfth operating condition;

[0029] When the integrated energy storage module is in the tenth operating condition, a tenth energy storage capacity charged by the third energy storage element at the charging power and a third remaining capacity discharged by the first energy storage element at the discharging power are obtained; if the tenth energy storage capacity reaches the upper charge and discharge limit, the integrated energy storage module switches to the thirteenth operating condition; if the tenth remaining capacity reaches the lower charge and discharge limit, the integrated energy storage module switches to the eleventh operating condition;

[0030] When the integrated energy storage module is in the eleventh operating condition, an eleventh stored energy quantity charged by the second energy storage element at the charging power and a twelfth remaining energy quantity discharged by the third energy storage element at the discharging power are obtained; if the eleventh stored energy quantity reaches the upper charge and discharge limit, the integrated energy storage module switches to the third operating condition; if the eleventh remaining energy quantity reaches the lower charge and discharge limit, the integrated energy storage module switches to the thirteenth operating condition;

[0031] When the integrated energy storage module is in the twelfth operating condition, obtaining a twelfth energy storage quantity charged by the first energy storage element at the charging power and a twelfth residual quantity discharged by the second energy storage element at the discharging power; if the twelfth energy storage quantity reaches the upper charge and discharge limit, the integrated energy storage module switches to the second operating condition; if the twelfth residual quantity reaches the lower charge and discharge limit, the integrated energy storage module switches to the fourth operating condition;

[0032] When the integrated energy storage module is in the thirteenth operating condition, a thirteenth stored energy quantity charged by the first energy storage element at the charging power and a thirteenth remaining energy quantity discharged by the second energy storage element at the discharging power are obtained; if the thirteenth stored energy quantity reaches the upper charge and discharge limit value, the integrated energy storage module switches to the sixth operating condition; if the thirteenth remaining energy quantity reaches the lower charge and discharge limit value, the integrated energy storage module switches to the third operating condition.

[0033] Preferably, the content of the primary modal decomposition calculation rule includes:

[0034] Calculating the power data set and the total generated power using a first residual operator formula to obtain a primary modal component;

[0035] Taking the primary modal component as the initial energy storage power;

[0036] The first residual operator formula is:

[0037] Where, P IME1 is the primary modal component, P w is the total power generated, w i is the i-th Gaussian white noise, M(*) is the residual operator, and I is the total number of Gaussian white noises.

[0038] Preferably, the content of the k-th modal decomposition calculation rule includes:

[0039] Performing empirical mode decomposition on the total generated power according to the modal decomposition order to obtain an order residual corresponding to the modal decomposition order;

[0040] Adding I Gaussian white noise to the order residual to construct a residual data set consisting of I data;

[0041] Calculating the residual data set and the k-1 order residual using a second residual operator formula to obtain a k-1 order modal component;

[0042] Calculate all the modal components of the order using the energy storage power calculation formula to obtain the energy storage power of the first k orders;

[0043] The second residual operator formula is:

[0044] The energy storage power calculation formula is: P BESS =P IMF1 +P IMF2 +…+P IMFk ;

[0045] Where, P IMEk is the kth order modal component, P RESk is the k-th order residual, w i is the i-th Gaussian white noise, M(*) is the residual operator, I is the total number of Gaussian white noise, P BESS is the energy storage power of the first k stages.

[0046] Preferably, the grid-connected power mathematical model includes a power expression and a fluctuation rate expression, and the power expression is:

[0047] The volatility expression is:

[0048] Where, P g (t) is the grid-connected power at time t, P wl (t) is the power output of the lth generator set at time t, P BESS (t) is the energy storage power at time t, n is the total number of generator sets in the integrated energy storage system of renewable energy transmission, P1(t) is the fluctuation rate of 1 minute time scale at time t, P 10 (t) is the volatility of the 10-minute time scale at time t, P w，rate The installed capacity of the power plant in the integrated energy storage system for renewable energy transmission, k t is the sampling interval, and a and b are the sampling moments.

[0049] Preferably, the constraint condition is P1∈[0,1 / 10], P 10 ∈[0, 1 / 3], P1 is the volatility of 1min time scale, P 10 is the volatility on a 10-min time scale.

[0050] In another aspect, a comprehensive control device for a power storage system for smoothing power fluctuations is provided. The device is applied to an integrated energy storage system for renewable energy power transmission. The integrated energy storage system for renewable energy power transmission includes an integrated energy storage module. The dual-layer energy storage power control device includes a data acquisition module, an initial calculation module, a first judgment module, a second judgment module, and a control storage module.

[0051] The data acquisition module is used to obtain a topological structure diagram, total generated power, and initial value of the modal decomposition order of the integrated energy storage system for renewable energy power transmission, and construct a grid-connected power mathematical model based on the topological structure diagram; and add I Gaussian white noise to the total generated power to construct a power data set consisting of I data;

[0052] The initial calculation module is configured to calculate, based on the initial value of the modal decomposition order, using a primary modal decomposition calculation rule to obtain a primary modal component and an initial energy storage power; input the initial energy storage power into the grid-connected power mathematical model to obtain an initial volatility corresponding to the primary modal component at two time scales;

[0053] The first judgment module is configured to use the initial energy storage power as the smoothing power of the integrated energy storage system for renewable energy transmission based on the initial fluctuation rates under two time scales satisfying the constraint conditions;

[0054] The second judgment module is configured to update the modal decomposition order based on the initial volatility at two time scales not satisfying the constraint conditions; calculate according to the modal decomposition order using the k-th modal decomposition calculation rule to obtain the order modal component and the energy storage power; input the energy storage power into the grid-connected power mathematical model to obtain the updated volatility corresponding to the order modal component at two time scales until the updated volatility satisfies the constraint conditions, and use the energy storage power corresponding to the updated volatility that satisfies the constraint conditions as the smoothing power of the integrated energy storage system for new energy power transmission;

[0055] The control storage module is used to control the integrated energy storage module to store the smoothing power by adopting an energy storage integrated control mode.

[0056] Preferably, the integrated energy storage module includes a first energy storage element, a second energy storage element and a third energy storage element, and the contents of the energy storage integrated control mode include:

[0057] Acquire parameter data of the integrated energy storage module, the parameter data including charging rated power, discharging rated power, rated energy storage power, rated energy storage capacity, charging and discharging upper limit value, charging and discharging lower limit value, working efficiency parameter and power control period;

[0058] Calculating the charging power, discharging power, remaining amount of charging energy storage, and remaining amount of discharging energy storage of the integrated energy storage module based on the parameter data;

[0059] controlling the first energy storage element, the second energy storage element, and the third energy storage element to switch and store the smoothing power in thirteen operating conditions according to the charge and discharge upper limit, the charge and discharge lower limit, the charging power, and the discharging power;

[0060] The thirteen operating conditions include a first operating condition, a second operating condition, a third operating condition, a fourth operating condition, a fifth operating condition, a sixth operating condition, a seventh operating condition, an eighth operating condition, a ninth operating condition, a tenth operating condition, an eleventh operating condition, a twelfth operating condition, and a thirteenth operating condition;

[0061] When the integrated energy storage module is in the first operating condition, a first energy storage capacity charged by the first energy storage element at the charging power and a first residual capacity discharged by the second energy storage element at the discharging power are obtained; if the first energy storage capacity reaches the upper charge and discharge limit, the integrated energy storage module switches to the second operating condition; if the first residual capacity reaches the lower charge and discharge limit, the integrated energy storage module switches to the third operating condition;

[0062] When the integrated energy storage module is in the second operating condition, a second energy storage capacity charged by the third energy storage element at the charging power and a second residual capacity discharged by the second energy storage element at the discharging power are obtained; if the second energy storage capacity reaches the upper charge and discharge limit, the integrated energy storage module switches to the fifth operating condition; if the second residual capacity reaches the lower charge and discharge limit, the integrated energy storage module switches to the fourth operating condition;

[0063] When the integrated energy storage module is in the third operating condition, a third energy storage capacity charged by the first energy storage element at the charging power and a third residual capacity discharged by the third energy storage element at the discharging power are obtained; if the third energy storage capacity reaches the upper charge and discharge limit, the integrated energy storage module switches to the sixth operating condition; if the third residual capacity reaches the lower charge and discharge limit, the integrated energy storage module switches to the seventh operating condition;

[0064] When the integrated energy storage module is in the fourth operating condition, a fourth energy storage capacity charged by the second energy storage element at the charging power and a fourth remaining capacity discharged by the first energy storage element at the discharging power are obtained; if the fourth energy storage capacity reaches the upper charge and discharge limit, the integrated energy storage module switches to the fifth operating condition; if the fourth remaining capacity reaches the lower charge and discharge limit, the integrated energy storage module switches to the eighth operating condition;

[0065] When the integrated energy storage module is in the fifth operating condition, a fifth energy storage capacity charged by the second energy storage element at the charging power and a fifth remaining capacity discharged by the first energy storage element at the discharging power are obtained; if the fifth energy storage capacity reaches the upper charge and discharge limit, the integrated energy storage module switches to the ninth operating condition; if the fifth remaining capacity reaches the lower charge and discharge limit, the integrated energy storage module switches to the eighth operating condition;

[0066] When the integrated energy storage module is in the sixth operating condition, a sixth energy storage capacity charged by the second energy storage element at the charging power and a sixth remaining capacity discharged by the third energy storage element at the discharging power are obtained; if the sixth energy storage capacity reaches the upper charge and discharge limit, the integrated energy storage module switches to the tenth operating condition; if the sixth remaining capacity reaches the lower charge and discharge limit, the integrated energy storage module switches to the seventh operating condition;

[0067] When the integrated energy storage module is in the seventh operating condition, a seventh energy storage capacity charged by the second energy storage element at the charging power and a seventh residual capacity discharged by the first energy storage element at the discharging power are obtained; if the seventh energy storage capacity reaches the upper charge and discharge limit, the integrated energy storage module switches to the tenth operating condition; if the seventh residual capacity reaches the lower charge and discharge limit, the integrated energy storage module switches to the eleventh operating condition;

[0068] When the integrated energy storage module is in the eighth operating condition, an eighth energy storage capacity charged by the second energy storage element at the charging power and an eighth residual capacity discharged by the third energy storage element at the discharging power are obtained; if the eighth energy storage capacity reaches the upper charge and discharge limit, the integrated energy storage module switches to the ninth operating condition; if the eighth residual capacity reaches the lower charge and discharge limit, the integrated energy storage module switches to the twelfth operating condition;

[0069] When the integrated energy storage module is in the ninth operating condition, a ninth energy storage quantity charged by the first energy storage element at the charging power and a ninth remaining quantity discharged by the third energy storage element at the discharging power are obtained; if the ninth energy storage quantity reaches the upper charge and discharge limit, the integrated energy storage module switches to the second operating condition; if the ninth remaining quantity reaches the lower charge and discharge limit, the integrated energy storage module switches to the twelfth operating condition;

[0070] When the integrated energy storage module is in the tenth operating condition, a tenth energy storage capacity charged by the third energy storage element at the charging power and a third remaining capacity discharged by the first energy storage element at the discharging power are obtained; if the tenth energy storage capacity reaches the upper charge and discharge limit, the integrated energy storage module switches to the thirteenth operating condition; if the tenth remaining capacity reaches the lower charge and discharge limit, the integrated energy storage module switches to the eleventh operating condition;

[0071] When the integrated energy storage module is in the eleventh operating condition, an eleventh stored energy quantity charged by the second energy storage element at the charging power and a twelfth remaining energy quantity discharged by the third energy storage element at the discharging power are obtained; if the eleventh stored energy quantity reaches the upper charge and discharge limit, the integrated energy storage module switches to the third operating condition; if the eleventh remaining energy quantity reaches the lower charge and discharge limit, the integrated energy storage module switches to the thirteenth operating condition;

[0072] When the integrated energy storage module is in the twelfth operating condition, obtaining a twelfth energy storage quantity charged by the first energy storage element at the charging power and a twelfth residual quantity discharged by the second energy storage element at the discharging power; if the twelfth energy storage quantity reaches the upper charge and discharge limit, the integrated energy storage module switches to the second operating condition; if the twelfth residual quantity reaches the lower charge and discharge limit, the integrated energy storage module switches to the fourth operating condition;

[0073] When the integrated energy storage module is in the thirteenth operating condition, a thirteenth stored energy quantity charged by the first energy storage element at the charging power and a thirteenth remaining energy quantity discharged by the second energy storage element at the discharging power are obtained; if the thirteenth stored energy quantity reaches the upper charge and discharge limit value, the integrated energy storage module switches to the sixth operating condition; if the thirteenth remaining energy quantity reaches the lower charge and discharge limit value, the integrated energy storage module switches to the third operating condition.

[0074] In another aspect, a terminal device is provided, comprising a processor and a memory;

[0075] The memory is used to store program code and transmit the program code to the processor;

[0076] The processor is used to execute the above-mentioned comprehensive control method for smoothing power fluctuation energy storage system according to the instructions in the program code.

[0077] The invention discloses a comprehensive control method, device and equipment for a power fluctuation-smoothing energy storage system. The method comprises obtaining a topological structure diagram, a total power generation power and an initial value of a modal decomposition order of an integrated energy storage system for renewable energy power transmission, and constructing a grid-connected power mathematical model according to the topological structure diagram; adding I Gaussian white noise to the total power generation power to construct a power data set consisting of I groups of data; calculating according to the initial value of the modal decomposition order using a primary modal decomposition calculation rule to obtain a primary modal component and an initial energy storage power; inputting the initial energy storage power into the grid-connected power mathematical model to obtain an initial fluctuation rate corresponding to the primary modal component at two time scales; if the initial fluctuation rate at the two time scales is The method adopts a novel method for controlling the power of an integrated energy storage system for renewable energy transmission and adopts a novel energy storage power generation method to generate a power supply with a power of 100 MW and a power of 200 MW. The power supply is connected to a grid-connected power supply, and a grid-connected power supply is connected to a grid-connected power supply ... As can be seen from the above technical solutions, the embodiments of the present application have the following advantages: the integrated control method for a power fluctuation smoothing energy storage system calculates the smoothing power through empirical mode decomposition, so that when the grid-connected power corresponding to the smoothing power is operated, the energy storage rated power demand and operating burden of the integrated energy storage system for the new energy power transmission can be reduced; the integrated energy storage control mode is used to control the integrated energy storage module to operate at the optimal discharge depth, fully utilizing its cycle life and extending its service life, thereby solving the technical problems of low system operating efficiency and short service life of its energy storage elements in the process of smoothing power fluctuations in existing new energy power transmission systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0079] FIG1 is a flowchart of the steps of a comprehensive control method for a power fluctuation smoothing energy storage system according to an embodiment of the present application;

[0080] FIG2 is a schematic diagram of the framework of an integrated energy storage system for renewable energy transmission in a comprehensive control method for a power storage system for smoothing power fluctuations according to an embodiment of the present application;

[0081] FIG3 is a flow chart of a comprehensive control method for a power fluctuation smoothing energy storage system according to an embodiment of the present application;

[0082] FIG4 a is a first-order modal diagram during the decomposition process of the flow chart of the integrated control method for smoothing power fluctuation energy storage system according to an embodiment of the present application;

[0083] FIG4 b is a second-order modal diagram during the decomposition process of the flowchart of the integrated control method for smoothing power fluctuation energy storage system according to an embodiment of the present application;

[0084] FIG4 c is a third-order modal diagram during the decomposition process of the flowchart of the integrated control method for smoothing power fluctuation energy storage system according to an embodiment of the present application;

[0085] FIG4 d is a fourth-order modal diagram during the decomposition process of the flowchart of the integrated control method for smoothing power fluctuation energy storage system according to an embodiment of the present application;

[0086] FIG5 is a graph showing the total power generated before and after smoothing of the integrated control method for smoothing power fluctuations of an energy storage system according to an embodiment of the present application using an ensemble of empirical mode decompositions;

[0087] FIG6 a is a graph showing the energy storage power curve of the integrated control method for smoothing power fluctuation energy storage systems according to an embodiment of the present application and the collective empirical mode decomposition;

[0088] FIG6 b is a frequency domain diagram of energy storage power according to the integrated empirical mode decomposition and the integrated control method for smoothing power fluctuation energy storage systems described in an embodiment of the present application;

[0089] FIG7 is a graph showing the total power generated before and after smoothing using different control methods;

[0090] Figure 8a is a graph of energy storage power after first-order high-pass filtering;

[0091] FIG8 b is a graph showing the energy storage power curve of the comprehensive control method for smoothing power fluctuations in an energy storage system according to an embodiment of the present application;

[0092] Figure 9 shows the charge and discharge energy imbalance of different control methods;

[0093] FIG10a is an output diagram of the first energy storage element in the comprehensive control method for smoothing power fluctuation energy storage system according to an embodiment of the present application;

[0094] FIG10 b is an output diagram of the second energy storage element in the comprehensive control method for smoothing power fluctuation energy storage system according to an embodiment of the present application;

[0095] FIG10c is an output diagram of the third energy storage element in the comprehensive control method for smoothing power fluctuation energy storage system according to an embodiment of the present application;

[0096] FIG11 is a SOC diagram of the state of charge of various parts of the existing dual-battery integrated energy storage system;

[0097] FIG12 is a diagram showing the state of charge (SOC) of each energy storage element in the integrated control method for smoothing power fluctuation energy storage systems according to an embodiment of the present application;

[0098] FIG13 is a framework flow chart of an integrated control device for smoothing power fluctuation energy storage systems according to an embodiment of the present application. DETAILED DESCRIPTION

[0099] In order to make the purpose, features, and advantages of the invention of this application more obvious and easy to understand, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described below are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0100] In the description of the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0101] In the embodiments of the present application, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections; direct connections, or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0102] The embodiments of the present application provide a comprehensive control method, device and equipment for a power fluctuation smoothing energy storage system, which adopts a two-layer control method to solve the technical problems of low system operation efficiency and short service life of its energy storage elements in the process of smoothing power fluctuations in existing new energy power transmission systems. In the outer layer control of the two-layer control method, the comprehensive control method, device and equipment for a power fluctuation smoothing energy storage system uses collective empirical mode decomposition as the basis for calculating the smoothing power, and uses the advantages of the signal processing method to keep the smoothed grid-connected power consistent with the phase of the total power generation, that is, to better track the total power generation, and improve it to enhance the ability to analyze the local total power generation, thereby reducing the energy storage rated power demand and operating burden. In the inner layer control of the two-layer control method, the energy storage integrated control mode is adopted to allow each group of energy storage elements to have different charging and discharging characteristics, and improve the robustness of energy imbalance, so that each group of energy storage elements can operate at the optimal discharge depth, fully utilize its cycle life and extend its service life. This comprehensive control method, device, and equipment for smoothing power fluctuations in energy storage systems is applicable to any power fluctuation smoothing scenario in the power grid that requires frequent charging and discharging of stored energy, such as photovoltaic fluctuations, tie-line power fluctuations, and other renewable energy fluctuation scenarios. The integrated energy storage control mode in this comprehensive control method, device, and equipment for smoothing power fluctuations in energy storage systems has broader applicability and can be applied to any scenario requiring frequent charging and discharging of stored energy, such as photovoltaic fluctuations, tie-line power fluctuations, and grid frequency regulation. In this embodiment, the renewable energy of a wind farm is used as an example for illustration.

[0103] Example 1:

[0104] Figure 1 is a flow chart of the steps of the comprehensive control method for smoothing power fluctuations of the energy storage system described in an embodiment of the present application, and Figure 2 is a schematic framework diagram of the integrated energy storage system for new energy power transmission in the comprehensive control method for smoothing power fluctuations of the energy storage system described in an embodiment of the present application.

[0105] As shown in FIG1 and FIG2 , an embodiment of the present application provides a comprehensive control method for a power fluctuation smoothing energy storage system, which is applied to an integrated energy storage system for renewable energy power transmission, and the integrated energy storage system for renewable energy power transmission includes an integrated energy storage module.

[0106] It should be noted that, as shown in Figure 2, the integrated energy storage system for renewable energy transmission includes a grid-connected busbar, a wind farm connected to it, a power grid, and an integrated energy storage module. The integrated energy storage module includes a first energy storage element A, a second energy storage element B, and a third energy storage element C. The sum of wind power and energy storage power is considered the final grid-connected power, with flow toward the grid-connected busbar as the positive direction. The wind farm includes n generator sets.

[0107] As shown in FIG1 , the integrated control method for a power fluctuation-smoothing energy storage system includes the following steps:

[0108] S1. Obtain the topological structure diagram, total generated power, and initial values ​​of the modal decomposition order of the integrated energy storage system for renewable energy transmission, and construct a grid-connected power mathematical model based on the topological structure diagram; and add I Gaussian white noise to the total generated power to construct a power data set consisting of I groups of data.

[0109] It should be noted that data is acquired in step S1, and a grid-connected power mathematical model and a power data set are constructed based on the acquired data. In this embodiment, the grid-connected power mathematical model is constructed based on the 1-minute and 10-minute timescale grid-connected active power variation limits and topology diagrams in the national standard GB / T 19963.1-2021 "Technical Provisions for Wind Farm Integration into Power Systems Part 1: Onshore Wind Power".

[0110] In the embodiment of the present application, the initial value of the modal decomposition order k=1, and the total power generation P w Add I groups of Gaussian white noise to construct the power data set i=1,2...,I,w i is the i-th Gaussian white noise.

[0111] In the embodiment of the present application, the grid-connected power mathematical model includes a power expression and a fluctuation rate expression. The power expression is:

[0112] The volatility expression is:

[0113] Where, P g (t) is the grid-connected power at time t, P wl (t) is the power output of the lth generator set at time t, P BESS (t) is the energy storage power at time t, n is the total number of generator sets in the integrated energy storage system of renewable energy transmission, P1(t) is the fluctuation rate of 1 minute time scale at time t, P 10 (t) is the volatility of the 10-minute time scale at time t, P w，rate The installed capacity of the power plant in the integrated energy storage system for renewable energy transmission, k t is the sampling interval, and a and b are the sampling moments.

[0114] It should be noted that a and b are sampling points corresponding to any sampling time in the period on the right side of the equal sign.

[0115] S2. Calculate the modal components and initial energy storage power using the primary modal decomposition calculation rules based on the initial value of the modal decomposition order. Input the initial energy storage power into the grid-connected power mathematical model to obtain the initial fluctuation rates corresponding to the primary modal components at two time scales.

[0116] It should be noted that in step S2, the initial modal decomposition calculation rule is used according to the initial value of the modal decomposition order to obtain the initial modal component P corresponding to the initial value of the modal decomposition order. IME1 And the initial energy storage power. Among them, the difference between the total power generation and the overall average value of the residual operator through empirical mode decomposition is taken as the primary modal component P IME1 At the initial value of the modal decomposition order, the initial energy storage power is the same as the value of the primary modal component. The obtained initial energy storage power and total power generation are then input into the grid-connected power mathematical model to calculate the initial grid-connected power of the integrated energy storage system for renewable energy transmission. The initial volatility at two time scales is calculated based on the initial grid-connected power in the volatility expression of the grid-connected power mathematical model.

[0117] S3. If the initial fluctuation rates under the two time scales meet the constraints, the initial energy storage power is used as the smoothing power of the integrated energy storage system for renewable energy transmission.

[0118] It should be noted that in step S3, when the two initial fluctuation rates obtained in step S2 meet the constraint conditions, the initial energy storage power is used as the smoothing power of the integrated energy storage system for renewable energy transmission, so that the grid-connected power at this time meets the grid-connected power required by the integrated energy storage system for renewable energy transmission. In this embodiment, the constraint conditions are P1∈[0, 1 / 10], P 10 ∈[0, 1 / 3], P1 is the volatility of 1min time scale, P 10 is the volatility on a 10-min time scale.

[0119] S4. If the initial volatility at the two time scales does not meet the constraints, update the modal decomposition order; use the k-th modal decomposition calculation rule according to the modal decomposition order to obtain the order modal components and energy storage power; input the energy storage power into the grid-connected power mathematical model to obtain the updated volatility corresponding to the order modal components at the two time scales, until the updated volatility meets the constraints, and use the energy storage power corresponding to the updated volatility that meets the constraints as the smoothing power of the integrated energy storage system for new energy power transmission.

[0120] It should be noted that in step S4, the modal decomposition order k=k+1, and then the k-th modal decomposition calculation rule is used according to the modal decomposition order to obtain the modal components and energy storage power corresponding to the modal decomposition order. The obtained energy storage power is then input into the grid-connected power mathematical model to obtain the updated volatility under two time scales. The iterative update calculation is continuously performed until the updated volatility under the two time scales meets the constraints. The energy storage power corresponding to the updated volatility that meets the constraints is used as the smoothing power of the integrated energy storage system for new energy power transmission, so that the grid-connected power at this time meets the grid-connected power required by the integrated energy storage system for new energy power transmission. In this embodiment, steps S1 to S4 of the comprehensive control method for smoothing power fluctuation energy storage systems use an outer layer control method to obtain the grid-connected power that meets the grid-connected requirements and the smoothing power that the integrated energy storage module needs to store.

[0121] S5. Use the energy storage integrated control mode to control the integrated energy storage module to store and smooth power.

[0122] It should be noted that the integrated control method for the energy storage system for smoothing power fluctuations adopts an energy storage integrated control mode of an inner layer control method to control the integrated energy storage module to store the smoothing power.

[0123] The present application provides a comprehensive control method for a power fluctuation-smoothing energy storage system, which includes obtaining a topological structure diagram of an integrated energy storage system for renewable energy transmission, total generated power, and an initial value of a modal decomposition order, and constructing a grid-connected power mathematical model based on the topological structure diagram; and adding I Gaussian white noise to the total generated power to construct a power data set consisting of I groups of data; calculating using a primary modal decomposition calculation rule based on the initial value of the modal decomposition order to obtain a primary modal component and an initial energy storage power; inputting the initial energy storage power into the grid-connected power mathematical model to obtain an initial fluctuation rate corresponding to the primary modal component at two time scales; if the initial fluctuation rate at the two time scales is The energy storage power is used as the smoothing power of the integrated energy storage system for renewable energy transmission if the initial volatility under the two time scales does not meet the constraints. If the initial volatility under the two time scales does not meet the constraints, the modal decomposition order is updated. The k-th modal decomposition calculation rule is used according to the modal decomposition order to obtain the order modal component and the energy storage power. The energy storage power is input into the grid-connected power mathematical model to obtain the updated volatility corresponding to the order modal component under the two time scales until the updated volatility meets the constraints. The energy storage power corresponding to the updated volatility that meets the constraints is used as the smoothing power of the integrated energy storage system for renewable energy transmission. The energy storage integrated control mode is used to control the integrated energy storage module to store the smoothing power. This integrated control method for a power fluctuation smoothing energy storage system calculates the smoothing power through empirical mode decomposition, so that when the grid-connected power corresponding to the smoothing power is operated, the energy storage rated power demand and operating burden of the integrated energy storage system for renewable energy power transmission can be reduced. An energy storage integrated control mode is adopted to control the integrated energy storage module to operate at the optimal discharge depth, fully utilizing its cycle life and extending its service life, thereby solving the technical problems of low system operating efficiency and short service life of its energy storage elements in the process of smoothing power fluctuations in existing renewable energy power transmission systems.

[0124] In one embodiment of the present application, the contents of the energy storage integrated control mode include:

[0125] Obtain parameter data of the integrated energy storage module, including charging rated power, discharging rated power, rated energy storage power, rated energy storage capacity, charging and discharging upper limit value, charging and discharging lower limit value, working efficiency parameter and power control period;

[0126] Calculate the charging power, discharging power, remaining charge and discharge energy storage capacity of the integrated energy storage module based on the parameter data;

[0127] According to the charge and discharge upper limit value, the charge and discharge lower limit value, the charging power and the discharging power, the first energy storage element, the second energy storage element and the third energy storage element are controlled to switch and store the smoothing power in thirteen operating conditions;

[0128] The thirteen operating conditions include a first operating condition, a second operating condition, a third operating condition, a fourth operating condition, a fifth operating condition, a sixth operating condition, a seventh operating condition, an eighth operating condition, a ninth operating condition, a tenth operating condition, an eleventh operating condition, a twelfth operating condition and a thirteenth operating condition.

[0129] It should be noted that the energy storage remaining capacity calculation formula is used according to the parameter data to obtain the charging power, discharging power, charging energy storage remaining capacity and discharging energy storage remaining capacity of the integrated energy storage module. The energy storage remaining capacity calculation formula is:

[0130] Where, P BESS，ch is the rated charging power, P BESS，dis is the discharge rated power, P BESS_rate is the rated energy storage power, E BESS_rate is the rated energy storage capacity, S c，max is the upper limit of charge and discharge, S d，min is the lower limit of charge and discharge, η is the working efficiency parameter, Δt is the power control period, t is the time, P ch is the charging power, P dis is the discharge power, S oc，ch The remaining power for charging and energy storage, S oc，dis is the remaining amount of energy stored in the discharge tank, and c represents an integral variable and does not represent any physical meaning. c，max The value can be selected as 0.9, S d，minA value of 0.1 can be selected. The initial state of charge of each energy storage element in the integrated energy storage module can be selected as 0.5. The thirteen operating conditions of the integrated energy storage module are shown in Table 1 below. The first operating condition is when the first energy storage element is in a charging state, the second energy storage element is in a discharging state, and the third energy storage element is in a standby state. The second operating condition is when the first energy storage element is in a standby state at the upper limit of charge and discharge, the second energy storage element is in a discharging state, and the third energy storage element is in a charging state. The third operating condition is when the first energy storage element is in a charging state, the second energy storage element is in a standby state at the lower limit of charge and discharge, and the third energy storage element is in a discharging state. The fourth operating condition is when the first energy storage element is in a discharging state, the second energy storage element is in a standby state at the lower limit of charge and discharge, and the third energy storage element is in a charging state. The fifth operating condition is when the first energy storage element is in a discharging state, the second energy storage element is in a charging state, and the third energy storage element is in a standby state at the upper limit of charge and discharge. The sixth operating condition is when the first energy storage element is in a standby state at the upper limit of charge and discharge, the second energy storage element is in a charging state, and the third energy storage element is in a discharging state. The seventh operating condition is a standby state in which the first energy storage element is in a discharging state, the second energy storage element is in a charging state, and the third energy storage element is in a lower charge and discharge limit value. The eighth operating condition is a standby state in which the first energy storage element is in a lower charge and discharge limit value, the second energy storage element is in a charging state, and the third energy storage element is in a discharging state. The ninth operating condition is a standby state in which the first energy storage element is in a charging state, the second energy storage element is in a standby state in which the upper charge and discharge limit value is, and the third energy storage element is in a discharging state. The tenth operating condition is a standby state in which the first energy storage element is in a discharging state, the second energy storage element is in a standby state in which the upper charge and discharge limit value is, and the third energy storage element is in a charging state. The eleventh operating condition is a standby state in which the first energy storage element is in a lower charge and discharge limit value, the second energy storage element is in a discharging state, and the third energy storage element is in a charging state. The twelfth operating condition is a standby state in which the first energy storage element is in a charging state, the second energy storage element is in a discharging state, and the third energy storage element is in a lower charge and discharge limit value. The thirteenth operating condition is a standby state in which the first energy storage element is in a charging state, the second energy storage element is in a discharging state, and the third energy storage element is in a standby state in which the upper charge and discharge limit value is.

[0131] Table 1 shows the thirteen operating conditions of the integrated energy storage module

[0132] In the embodiment of the present application, the energy storage integrated control mode is to control the integrated energy storage module to track and stabilize the power P BESSThis is done to smooth out fluctuations in total transmitted power. In the integrated energy storage control mode, the first energy storage element A stores and charges to smooth out positive fluctuations in total generated power, the second energy storage element B stores and discharges to smooth out negative fluctuations in total generated power, and the third energy storage element C serves as a backup. If the first or second energy storage element A cannot fully track the required power due to rated power or remaining charge (SOC) constraints, the third energy storage element C compensates. If this still fails, the second or first energy storage element A provides the next compensation.

[0133] It should be noted that the energy storage integrated control mode can coordinate between groups to effectively smooth out power fluctuations, and significantly improve the robustness of the energy storage integrated control mode to charge and discharge energy imbalance, so that the energy storage of the energy storage elements can operate at the optimal discharge depth, and can fully utilize its cycle life, reducing the battery life loss of the energy storage elements during operation, thereby improving its life utilization rate.

[0134] In an embodiment of the present application, controlling the first energy storage element, the second energy storage element, and the third energy storage element to switch storage and smoothing power in thirteen operating conditions according to the charge and discharge upper limit, the charge and discharge lower limit, the charging power, and the discharging power includes:

[0135] When the integrated energy storage module is in the first operating condition, a first energy storage capacity charged by the first energy storage element at the charging power and a first residual capacity discharged by the second energy storage element at the discharging power are obtained; if the first energy storage capacity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the second operating condition; if the first residual capacity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the third operating condition;

[0136] When the integrated energy storage module is in the second operating condition, the second energy storage quantity charged by the third energy storage element at the charging power and the second residual quantity discharged by the second energy storage element at the discharging power are obtained; if the second energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the fifth operating condition; if the second residual quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the fourth operating condition;

[0137] When the integrated energy storage module is in the third operating condition, a third energy storage quantity charged by the first energy storage element at the charging power and a third residual quantity discharged by the third energy storage element at the discharging power are obtained; if the third energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the sixth operating condition; if the third residual quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the seventh operating condition;

[0138] When the integrated energy storage module is in the fourth operating condition, a fourth energy storage quantity charged by the second energy storage element at the charging power and a fourth residual quantity discharged by the first energy storage element at the discharging power are obtained; if the fourth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the fifth operating condition; if the fourth residual quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the eighth operating condition;

[0139] When the integrated energy storage module is in the fifth operating condition, a fifth energy storage capacity charged by the second energy storage element at the charging power and a fifth residual capacity discharged by the first energy storage element at the discharging power are obtained; if the fifth energy storage capacity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the ninth operating condition; if the fifth residual capacity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the eighth operating condition;

[0140] When the integrated energy storage module is in the sixth operating condition, a sixth energy storage quantity charged by the second energy storage element at the charging power and a sixth residual quantity discharged by the third energy storage element at the discharging power are obtained; if the sixth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the tenth operating condition; if the sixth residual quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the seventh operating condition;

[0141] When the integrated energy storage module is in the seventh operating condition, the seventh energy storage capacity charged by the second energy storage element at the charging power and the seventh residual capacity discharged by the first energy storage element at the discharging power are obtained; if the seventh energy storage capacity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the tenth operating condition; if the seventh residual capacity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the eleventh operating condition;

[0142] When the integrated energy storage module is in the eighth operating condition, an eighth energy storage quantity charged by the second energy storage element at the charging power and an eighth residual quantity discharged by the third energy storage element at the discharging power are obtained; if the eighth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the ninth operating condition; if the eighth residual quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the twelfth operating condition;

[0143] When the integrated energy storage module is in the ninth operating condition, a ninth energy storage quantity charged by the first energy storage element at the charging power and a ninth residual quantity discharged by the third energy storage element at the discharging power are obtained; if the ninth energy storage quantity reaches the upper charge and discharge limit, the integrated energy storage module switches to the second operating condition; if the ninth residual quantity reaches the lower charge and discharge limit, the integrated energy storage module switches to the twelfth operating condition;

[0144] When the integrated energy storage module is in the tenth operating condition, a tenth energy storage quantity charged by the third energy storage element at the charging power and a third residual quantity discharged by the first energy storage element at the discharging power are obtained; if the tenth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the thirteenth operating condition; if the tenth residual quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the eleventh operating condition;

[0145] When the integrated energy storage module is in the eleventh operating condition, the eleventh stored energy quantity charged by the second energy storage element at the charging power and the twelfth remaining energy quantity discharged by the third energy storage element at the discharging power are obtained; if the eleventh stored energy quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the third operating condition; if the eleventh remaining energy quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the thirteenth operating condition;

[0146] When the integrated energy storage module is in the twelfth operating condition, the twelfth energy storage quantity charged by the first energy storage element at the charging power and the twelfth residual quantity discharged by the second energy storage element at the discharging power are obtained; if the twelfth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the second operating condition; if the twelfth residual quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the fourth operating condition;

[0147] When the integrated energy storage module is in the thirteenth operating condition, the thirteenth energy storage quantity charged by the first energy storage element at the charging power and the thirteenth remaining quantity discharged by the second energy storage element at the discharging power are obtained; if the thirteenth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the sixth operating condition; if the thirteenth remaining quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the third operating condition.

[0148] It should be noted that in the energy storage integrated control mode, when the first energy storage element A is charged to S oc，max When the energy stored in the second energy storage element B is discharged to S oc，min When the second energy storage element B is switched to the standby state, the energy storage of the third energy storage element C is switched to the discharging state.

[0149] FIG3 is a flow chart of a comprehensive control method for a power fluctuation smoothing energy storage system according to an embodiment of the present application.

[0150] As shown in FIG3 , in one embodiment of the present application, the content of the primary modal decomposition calculation rule includes:

[0151] The power data set and the total generated power are calculated using the first residual operator formula to obtain the primary modal components;

[0152] The primary modal component is taken as the initial energy storage power;

[0153] The first residual operator formula is:

[0154] Where, P IME1 is the primary modal component, P w is the total power generated, w i is the i-th Gaussian white noise, M(*) is the residual operator, and I is the total number of Gaussian white noises.

[0155] It should be noted that, taking the acquisition of the first-order modal component as an example, the decomposition process of the total power generated based on the ensemble empirical mode decomposition is shown in the first and second formulas. The first formula is:

[0156] The second formula is:

[0157] Where, E l (*) represents the order mode after EMD decomposition of *, and M(*) represents the average value of the maximum and minimum envelopes during the EMD decomposition of *, which is also the residual of this decomposition process. To reduce the impact of noise on total power generation during the addition of noise, this integrated control method for energy storage systems for smoothing power fluctuations obtains modal components only by estimating the mean of the residual after noise addition, as shown in the first residual operator formula.

[0158] As shown in FIG3 , in one embodiment of the present application, the content of the k-th modal decomposition calculation rule includes:

[0159] According to the modal decomposition order, the total power generated is subjected to empirical modal decomposition to obtain the order margin corresponding to the modal decomposition order;

[0160] Add I Gaussian white noise to the order residual to construct a residual data set consisting of I data;

[0161] The residual data set and the k-1 order residual are calculated using the second residual operator formula to obtain the k-1 order modal component;

[0162] Calculate all modal components using the energy storage power calculation formula to obtain the energy storage power of the first k orders;

[0163] The second residual operator formula is:

[0164] The energy storage power calculation formula is: P BESS =P IMF1 +P IMF2 +…+P IMFk ;

[0165] Where, P IMEkis the kth order modal component, P RESk is the k-th order residual, w i is the i-th Gaussian white noise, M(*) is the residual operator, I is the total number of Gaussian white noise, P BESS is the energy storage power of the first k stages.

[0166] It should be noted that the residual data set i=1,2...,I,w i is the i-th Gaussian white noise. In this embodiment, the k-th order residual is obtained by decomposing the data in the residual data set using the EMD decomposition principle. The EMD decomposition principle is common knowledge in this field and will not be introduced in detail here. Among them, the k-th modal decomposition calculation rule and the primary modal decomposition calculation rule of the integrated control method for smoothing power fluctuation energy storage system gradually decompose the high-frequency fluctuating power through the residual operator and reconstruct it into energy storage power. Then, the minimum number of residual decompositions is adaptively determined according to the grid connection requirements, which improves the situation where the traditional method requires complete decomposition of the power signal, resulting in low efficiency. At the same time, it can better analyze the total power of local power generation and reduce the aliased low-frequency power components in the energy storage power. Compared with low-pass filtering, sliding average method and other methods, it effectively reduces the grid-connected power lagging behind the power generation and the additional energy storage power, thereby reducing the power demand and operating burden of the integrated energy storage system for new energy transmission.

[0167] In the embodiment of the present application, the comprehensive control method for the energy storage system for smoothing power fluctuations can be applied to large-scale wind power grid connection, and can effectively smooth the fluctuations in total power generated during the grid connection process, and control its impact on the safe and stable operation of the power system within an acceptable range. The smoothed grid-connected power can better track the total power generated, reducing the rated power demand and operating energy loss of the integrated energy storage module. At the same time, it can enable each energy storage element of the integrated energy storage module to operate at the optimal discharge depth, improve its cycle life utilization rate, and thus improve the economic efficiency of the integrated energy storage module in the total power generation fluctuation smoothing scenario. In addition, the comprehensive control method for the energy storage system for smoothing power fluctuations can also be applied to other power fluctuation scenarios that require frequent charging and discharging switching of energy storage, and has good promotion benefits.

[0168] Figure 4a is a first-order modal diagram during the decomposition process of the flowchart of the comprehensive control method for smoothing power fluctuations of the energy storage system described in an embodiment of the present application, Figure 4b is a second-order modal diagram during the decomposition process of the flowchart of the comprehensive control method for smoothing power fluctuations of the energy storage system described in an embodiment of the present application, Figure 4c is a third-order modal diagram during the decomposition process of the flowchart of the comprehensive control method for smoothing power fluctuations of the energy storage system described in an embodiment of the present application, Figure 4d is a fourth-order modal diagram during the decomposition process of the flowchart of the comprehensive control method for smoothing power fluctuations of the energy storage system described in an embodiment of the present application, Figure 5 is a curve diagram of the total power generated before and after smoothing of the collective empirical mode decomposition and the comprehensive control method for smoothing power fluctuations of the energy storage system described in an embodiment of the present application, Figure 6a is a storage power curve diagram of the collective empirical mode decomposition and the comprehensive control method for smoothing power fluctuations of the energy storage system described in an embodiment of the present application, and Figure 6b is a curve diagram of the collective empirical mode decomposition and the comprehensive control method for smoothing power fluctuations of the energy storage system described in an embodiment of the present application. FIG7 is a graph of the energy storage power frequency domain of the comprehensive control method for smoothing the total power before and after smoothing of different control methods, FIG8a is a graph of the energy storage power curve of the first-order high-pass filter, FIG8b is a graph of the energy storage power curve of the comprehensive control method for smoothing the power fluctuation energy storage system described in the embodiment of the present application, FIG9 is the charge and discharge energy imbalance of different control methods, FIG10a is an output diagram of the first energy storage element in the comprehensive control method for smoothing the power fluctuation energy storage system described in the embodiment of the present application, FIG10b is an output diagram of the second energy storage element in the comprehensive control method for smoothing the power fluctuation energy storage system described in the embodiment of the present application, FIG10c is an output diagram of the third energy storage element in the comprehensive control method for smoothing the power fluctuation energy storage system described in the embodiment of the present application, FIG11 is an SOC diagram of the state of charge of each part of the existing dual-battery integrated energy storage system, and FIG12 is an SOC diagram of the state of charge of each energy storage element in the comprehensive control method for smoothing the power fluctuation energy storage system described in the embodiment of the present application.

[0169] In the embodiment of the present application, the effectiveness of the integrated control method for the energy storage system for smoothing power fluctuations is verified by actual wind farm power data. As shown in Figures 4a to 4d, after four decompositions, the grid-connected power obtained can meet the grid-connected requirements. In this process, the high-frequency fluctuating power components can be gradually analyzed, and the aliased low-frequency power components (taking <0.01Hz as an example) can be controlled within a very small range during each decomposition process, and the energy storage system can be accurately controlled to offset the high-frequency fluctuating power in the wind power with fewer decomposition times. As shown in Figure 5, the wind power before and after smoothing of the integrated control method for the energy storage system for smoothing power fluctuations is shown. Compared with the empirical mode decomposition, the integrated control method for the energy storage system for smoothing power fluctuations can better analyze the local wind power, so that the local wind power can be better tracked while meeting the smoothing requirements, thereby reducing the rated power demand and operating burden of the storage system. The maximum energy storage power demand and operating energy loss are reduced from 9.26MW and 4.39MWh to 7.27MW and 3.6MWh. Figures 6a and 6b show the power and corresponding frequency domain of the integrated energy storage system for renewable energy transmission during the power smoothing process. Compared to empirical mode decomposition, this integrated control method for energy storage systems for power fluctuation smoothing effectively controls the maximum energy storage power demand. Due to better tracking of wind power, the overall energy storage power is improved. Furthermore, this integrated control method for energy storage systems for power fluctuation smoothing effectively mitigates low-frequency power aliasing in the energy storage power, reduces ineffective energy exchange, reduces energy losses in the integrated energy storage system for renewable energy transmission, and improves the economic efficiency of power smoothing. The aliasing of low-frequency power components is reduced from 1.36% to 0.75%. Figures 7, 8a, and 8b show the grid-connected power and energy storage power before and after smoothing using first-order low-pass filtering, moving average filtering, and this integrated control method for energy storage systems for power fluctuation smoothing. When using first-order low-pass filtering and moving average filtering, due to the phase lag in the control process, the smoothed grid-connected power significantly lags behind the wind power. This also means that the energy storage power is subject to a trend component caused by the phase lag, increasing its operational burden. This integrated control method for energy storage systems used to smooth power fluctuations effectively addresses these issues, balancing overall wind power smoothing and local wind power tracking. It minimizes the rated power demand for integrated energy storage systems used for renewable energy transmission, while also improving overall output. Compared to first-order low-pass filtering and sliding average filtering, this integrated control method for energy storage systems used to smooth power fluctuations reduces the maximum energy storage power demand from 11.71MW and 12.24MW to 7.27MW, and reduces operating energy loss from 6.51MWh and 6.68MWh to 3.6MWh.Figure 9 shows the energy imbalance of first-order low-pass filtering, sliding average filtering, and the present invention. Due to the phase lag of first-order low-pass filtering and sliding average filtering, the energy imbalance during the control process is relatively large. However, the integrated control method for smoothing power fluctuation energy storage systems has improved this situation to a great extent, allowing the energy storage elements to operate close to the optimal discharge depth. As shown in Figures 10a and 10b, during the operation of the integrated energy storage module, the energy storage elements of each energy storage element have different charging and discharging characteristics. When the energy storage of a certain energy storage element is charged to smooth the positive wind power fluctuation, the energy storage of another energy storage element is discharged to suppress the negative wind power fluctuation. The energy storage of the last energy storage element is in a standby state and compensates when the energy storage of a certain energy storage element cannot smooth the fluctuation due to the rated power or state of charge (SOC) constraints. As shown in Figures 11 and 12, although the integrated control method for the energy storage system for smoothing power fluctuations can better control the imbalance of charge and discharge energy, since the dual-battery integrated system is very sensitive to energy imbalance, the battery storage of each part cannot operate at the optimal discharge depth during the cycle. The energy storage integrated control mode control of the integrated control method for the energy storage system for smoothing power fluctuations solves this problem, so that each part of the battery energy storage can operate at the optimal discharge depth during the operation cycle, fully utilizing the cycle life of the energy storage element.

[0170] Example 2:

[0171] FIG13 is a framework flow chart of the integrated control device for smoothing power fluctuation energy storage systems according to an embodiment of the present application.

[0172] As shown in FIG13 , an embodiment of the present application provides a comprehensive control device for a power fluctuation-smoothing energy storage system, which is applied to an integrated energy storage system for renewable energy transmission. The integrated energy storage system for renewable energy transmission includes an integrated energy storage module. The energy storage power dual-layer control device includes a data acquisition module 10, an initial calculation module 20, a first judgment module 30, a second judgment module 40, and a control storage module 50.

[0173] The data acquisition module 10 is used to obtain a topological structure diagram, total generated power, and initial values ​​of the modal decomposition order of the integrated energy storage system for renewable energy transmission, construct a grid-connected power mathematical model based on the topological structure diagram, and add I Gaussian white noise to the total generated power to construct a power data set consisting of I groups of data;

[0174] The initial calculation module 20 is used to calculate the initial modal components and initial energy storage power according to the initial value of the modal decomposition order using the primary modal decomposition calculation rules; the initial energy storage power is input into the grid-connected power mathematical model to obtain the initial fluctuation rate corresponding to the primary modal components at two time scales;

[0175] A first judgment module 30 is configured to use the initial energy storage power as the smoothing power of the integrated energy storage system for renewable energy transmission based on the initial fluctuation rates under two time scales satisfying the constraint conditions;

[0176] The second judgment module 40 is configured to update the modal decomposition order based on the initial volatility at two time scales not satisfying the constraint conditions; calculate the k-th modal decomposition calculation rule based on the modal decomposition order to obtain the k-th modal component and the energy storage power; input the energy storage power into the grid-connected power mathematical model to obtain the updated volatility at two time scales corresponding to the k-th modal component, until the updated volatility satisfies the constraint conditions, and use the energy storage power corresponding to the updated volatility that satisfies the constraint conditions as the smoothing power of the integrated energy storage system for new energy power transmission;

[0177] The control storage module 50 is used to control the integrated energy storage module to store and smooth power by adopting the energy storage integrated control mode.

[0178] In the embodiment of the present application, the integrated energy storage module includes a first energy storage element, a second energy storage element, and a third energy storage element. The contents of the energy storage integrated control mode include:

[0179] Obtain parameter data of the integrated energy storage module, including charging rated power, discharging rated power, rated energy storage power, rated energy storage capacity, charging and discharging upper limit value, charging and discharging lower limit value, working efficiency parameter and power control period;

[0180] Calculate the charging power, discharging power, remaining charge and discharge energy storage capacity of the integrated energy storage module based on the parameter data;

[0181] According to the charge and discharge upper limit value, the charge and discharge lower limit value, the charging power and the discharging power, the first energy storage element, the second energy storage element and the third energy storage element are controlled to switch and store the smoothing power in thirteen operating conditions;

[0182] The thirteen operating conditions include a first operating condition, a second operating condition, a third operating condition, a fourth operating condition, a fifth operating condition, a sixth operating condition, a seventh operating condition, an eighth operating condition, a ninth operating condition, a tenth operating condition, an eleventh operating condition, a twelfth operating condition, and a thirteenth operating condition;

[0183] When the integrated energy storage module is in the first operating condition, a first energy storage capacity charged by the first energy storage element at the charging power and a first residual capacity discharged by the second energy storage element at the discharging power are obtained; if the first energy storage capacity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the second operating condition; if the first residual capacity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the third operating condition;

[0184] When the integrated energy storage module is in the second operating condition, the second energy storage quantity charged by the third energy storage element at the charging power and the second residual quantity discharged by the second energy storage element at the discharging power are obtained; if the second energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the fifth operating condition; if the second residual quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the fourth operating condition;

[0185] When the integrated energy storage module is in the third operating condition, a third energy storage quantity charged by the first energy storage element at the charging power and a third residual quantity discharged by the third energy storage element at the discharging power are obtained; if the third energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the sixth operating condition; if the third residual quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the seventh operating condition;

[0186] When the integrated energy storage module is in the fourth operating condition, a fourth energy storage quantity charged by the second energy storage element at the charging power and a fourth residual quantity discharged by the first energy storage element at the discharging power are obtained; if the fourth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the fifth operating condition; if the fourth residual quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the eighth operating condition;

[0187] When the integrated energy storage module is in the fifth operating condition, a fifth energy storage capacity charged by the second energy storage element at the charging power and a fifth residual capacity discharged by the first energy storage element at the discharging power are obtained; if the fifth energy storage capacity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the ninth operating condition; if the fifth residual capacity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the eighth operating condition;

[0188] When the integrated energy storage module is in the sixth operating condition, a sixth energy storage quantity charged by the second energy storage element at the charging power and a sixth residual quantity discharged by the third energy storage element at the discharging power are obtained; if the sixth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the tenth operating condition; if the sixth residual quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the seventh operating condition;

[0189] When the integrated energy storage module is in the seventh operating condition, the seventh energy storage capacity charged by the second energy storage element at the charging power and the seventh residual capacity discharged by the first energy storage element at the discharging power are obtained; if the seventh energy storage capacity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the tenth operating condition; if the seventh residual capacity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the eleventh operating condition;

[0190] When the integrated energy storage module is in the eighth operating condition, an eighth energy storage quantity charged by the second energy storage element at the charging power and an eighth residual quantity discharged by the third energy storage element at the discharging power are obtained; if the eighth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the ninth operating condition; if the eighth residual quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the twelfth operating condition;

[0191] When the integrated energy storage module is in the ninth operating condition, a ninth energy storage quantity charged by the first energy storage element at the charging power and a ninth residual quantity discharged by the third energy storage element at the discharging power are obtained; if the ninth energy storage quantity reaches the upper charge and discharge limit, the integrated energy storage module switches to the second operating condition; if the ninth residual quantity reaches the lower charge and discharge limit, the integrated energy storage module switches to the twelfth operating condition;

[0192] When the integrated energy storage module is in the tenth operating condition, a tenth energy storage quantity charged by the third energy storage element at the charging power and a third residual quantity discharged by the first energy storage element at the discharging power are obtained; if the tenth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the thirteenth operating condition; if the tenth residual quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the eleventh operating condition;

[0193] When the integrated energy storage module is in the eleventh operating condition, the eleventh stored energy quantity charged by the second energy storage element at the charging power and the twelfth remaining energy quantity discharged by the third energy storage element at the discharging power are obtained; if the eleventh stored energy quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the third operating condition; if the eleventh remaining energy quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the thirteenth operating condition;

[0194] When the integrated energy storage module is in the twelfth operating condition, the twelfth energy storage quantity charged by the first energy storage element at the charging power and the twelfth residual quantity discharged by the second energy storage element at the discharging power are obtained; if the twelfth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the second operating condition; if the twelfth residual quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the fourth operating condition;

[0195] When the integrated energy storage module is in the thirteenth operating condition, the thirteenth energy storage quantity charged by the first energy storage element at the charging power and the thirteenth remaining quantity discharged by the second energy storage element at the discharging power are obtained; if the thirteenth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the sixth operating condition; if the thirteenth remaining quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the third operating condition.

[0196] It should be noted that the modules in the apparatus of Example 2 correspond to the steps in the method of Example 1. The content of the comprehensive control method for smoothing power fluctuation energy storage system has been described in detail in Example 1, and the content of the modules in the apparatus will not be described in detail in this Example 2.

[0197] Example 3:

[0198] An embodiment of the present application provides a terminal device, including a processor and a memory;

[0199] A memory, configured to store program codes and transmit the program codes to a processor;

[0200] The processor is configured to execute the above-mentioned comprehensive control method for smoothing power fluctuation energy storage system according to the instructions in the program code.

[0201] It should be noted that the processor is configured to execute the steps of the aforementioned embodiment of a comprehensive control method for smoothing power fluctuations in an energy storage system according to the instructions in the program code. Alternatively, the processor implements the functions of the modules / units in the aforementioned system / device embodiments when executing the computer program.

[0202] For example, a computer program may be divided into one or more modules / units, one or more of which are stored in a memory and executed by a processor to complete the present application. One or more modules / units may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the computer program in a terminal device.

[0203] Terminal devices can be computing devices such as desktop computers, laptops, PDAs, and cloud servers. Terminal devices may include, but are not limited to, processors and memory. Those skilled in the art will appreciate that this does not constitute a limitation on terminal devices and may include more or fewer components than shown, or a combination of certain components, or different components. For example, terminal devices may also include input / output devices, network access devices, buses, and the like.

[0204] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0205] Memory can be an internal storage unit of a terminal device, such as a hard drive or memory. It can also be an external storage device, such as a plug-in hard drive, a Smart Media Card (SMC), a Secure Digital (SD) card, or a flash memory card. Furthermore, memory can include both internal and external storage units. Memory is used to store computer programs and other programs and data required by the terminal device. Memory can also be used to temporarily store data that has been output or is about to be output.

[0206] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0207] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0208] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0209] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0210] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0211] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A comprehensive control method for a power fluctuation-smoothing energy storage system, applied to an integrated energy storage system for renewable energy power transmission, wherein the integrated energy storage system for renewable energy power transmission comprises an integrated energy storage module, characterized in that: The energy storage power double-layer control method comprises the following steps: Obtain a topological structure diagram, total power generation and initial value of modal decomposition order of an integrated energy storage system for renewable energy transmission, and construct a grid-connected power mathematical model according to the topological structure diagram; and add I Gaussian white noise to the total power generation to construct a power data set consisting of I data; According to the initial value of the modal decomposition order, the primary modal decomposition calculation rule is used to calculate to obtain the primary modal component and the initial energy storage power; the initial energy storage power is input into the grid-connected power mathematical model to obtain the initial volatility corresponding to the primary modal component at two time scales; If the initial fluctuation rates under the two time scales meet the constraint conditions, the initial energy storage power is used as the smoothing power of the integrated energy storage system for renewable energy transmission; If the initial volatility at two time scales does not meet the constraint conditions, update the modal decomposition order; calculate using the k-th modal decomposition calculation rule according to the modal decomposition order to obtain the order modal component and energy storage power; input the energy storage power into the grid-connected power mathematical model to obtain the updated volatility corresponding to the order modal component at two time scales, until the updated volatility meets the constraint conditions, and use the energy storage power corresponding to the updated volatility that meets the constraint conditions as the smoothing power of the integrated energy storage system for new energy power transmission; The integrated energy storage module is controlled to store the smoothing power by adopting an energy storage integrated control mode.

2. The comprehensive control method for a power fluctuation-smoothing energy storage system according to claim 1, characterized in that: The integrated energy storage module includes a first energy storage element, a second energy storage element and a third energy storage element, and the content of the energy storage integrated control mode includes: Acquire parameter data of the integrated energy storage module, the parameter data including charging rated power, discharging rated power, rated energy storage power, rated energy storage capacity, charging and discharging upper limit value, charging and discharging lower limit value, working efficiency parameter and power control cycle; According to the parameter data, the charging power, discharging power, remaining amount of charging energy storage and remaining amount of discharging energy storage of the integrated energy storage module are calculated; The first energy storage element, the second energy storage element, and the third energy storage element are controlled according to the charge and discharge upper limit value, the charge and discharge lower limit value, the charging power, and the discharging power. Thirteen operating conditions switch to store the smoothing power; The thirteen operating conditions include a first operating condition, a second operating condition, a third operating condition, a fourth operating condition, a fifth operating condition, a sixth operating condition, a seventh operating condition, an eighth operating condition, a ninth operating condition, a tenth operating condition, an eleventh operating condition, a twelfth operating condition and a thirteenth operating condition.

3. The comprehensive control method for a power fluctuation-smoothing energy storage system according to claim 2, characterized in that: Controlling the first energy storage element, the second energy storage element, and the third energy storage element to switch and store the smoothing power in thirteen operating conditions according to the charge and discharge upper limit value, the charge and discharge lower limit value, the charging power, and the discharging power includes: When the integrated energy storage module is in the first operating condition, a first energy storage quantity charged by the first energy storage element at the charging power and a first remaining quantity discharged by the second energy storage element at the discharging power are obtained; if the first energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the second operating condition; if the first remaining quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the third operating condition; When the integrated energy storage module is in the second operating condition, a second energy storage quantity charged by the third energy storage element at the charging power and a second remaining quantity discharged by the second energy storage element at the discharging power are obtained; if the second energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the fifth operating condition; if the second remaining quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the fourth operating condition; When the integrated energy storage module is in the third operating condition, a third energy storage quantity charged by the first energy storage element at the charging power and a third remaining quantity discharged by the third energy storage element at the discharging power are obtained; if the third energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the sixth operating condition; if the third remaining quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the seventh operating condition; When the integrated energy storage module is in the fourth operating condition, a fourth energy storage quantity charged by the second energy storage element at the charging power and a fourth remaining quantity discharged by the first energy storage element at the discharging power are obtained; if the fourth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the fifth operating condition; if the fourth remaining quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the eighth operating condition; When the integrated energy storage module is in the fifth operating condition, a fifth energy storage quantity charged by the second energy storage element at the charging power and a fifth remaining quantity discharged by the first energy storage element at the discharging power are obtained; if the fifth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the ninth operating condition; if the fifth remaining quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the eighth operating condition; When the integrated energy storage module is in the sixth operating condition, a sixth energy storage quantity charged by the second energy storage element at the charging power and a sixth remaining quantity discharged by the third energy storage element at the discharging power are obtained; if the sixth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the tenth operating condition; if the sixth remaining quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the seventh operating condition; When the integrated energy storage module is in the seventh operating condition, the seventh energy storage capacity charged by the second energy storage element at the charging power and the seventh remaining capacity discharged by the first energy storage element at the discharging power are obtained; if the seventh energy storage capacity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the tenth operating condition; if the seventh remaining capacity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the eleventh operating condition; When the integrated energy storage module is in the eighth operating condition, an eighth energy storage quantity charged by the second energy storage element at the charging power and an eighth remaining quantity discharged by the third energy storage element at the discharging power are obtained; if the eighth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the ninth operating condition; if the eighth remaining quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the twelfth operating condition; When the integrated energy storage module is in the ninth operating condition, a ninth energy storage quantity charged by the first energy storage element at the charging power and a ninth remaining quantity discharged by the third energy storage element at the discharging power are obtained; if the ninth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the second operating condition; if the ninth remaining quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the twelfth operating condition; When the integrated energy storage module is in the tenth operating condition, the tenth energy storage capacity charged by the third energy storage element at the charging power and the third remaining capacity discharged by the first energy storage element at the discharging power are obtained; if the tenth energy storage capacity reaches the charging and discharging upper limit value, the integrated energy storage module switches to the thirteenth operating condition; if the tenth remaining capacity reaches the The charging and discharging lower limit value is reached, and the integrated energy storage module switches to the eleventh operating condition; When the integrated energy storage module is in the eleventh operating condition, the eleventh energy storage quantity charged by the second energy storage element at the charging power and the twelfth remaining quantity discharged by the third energy storage element at the discharging power are obtained; if the eleventh energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the third operating condition; if the eleventh remaining quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the thirteenth operating condition; When the integrated energy storage module is in the twelfth operating condition, the twelfth energy storage quantity charged by the first energy storage element at the charging power and the twelfth residual quantity discharged by the second energy storage element at the discharging power are obtained; if the twelfth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the second operating condition; if the twelfth residual quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the fourth operating condition; When the integrated energy storage module is in the thirteenth operating condition, the thirteenth energy storage capacity charged by the first energy storage element with the charging power and the thirteenth remaining capacity discharged by the second energy storage element with the discharging power are obtained; if the thirteenth energy storage capacity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the sixth operating condition; if the thirteenth remaining capacity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the third operating condition.

4. The comprehensive control method for a power fluctuation-smoothing energy storage system according to claim 1, characterized in that: The content of the primary modal decomposition calculation rule includes: Calculating the power data set and the total generated power using a first residual operator formula to obtain a primary modal component; Taking the initial modal component as the initial energy storage power; The first residual operator formula is: Where P IME1 is the primary modal component, P w is the total power generated, w i is the i-th Gaussian white noise, M(*) is the residual operator, and I is the total number of Gaussian white noises.

5. The comprehensive control method for a power fluctuation-smoothing energy storage system according to claim 1, characterized in that: The content of the k-th modal decomposition calculation rule includes: According to the modal decomposition order, the total power generation is subjected to empirical modal decomposition to obtain The order residual corresponding to the modal decomposition order; Adding I Gaussian white noise to the order residual to construct a residual data set consisting of I data; The residual data set and the k-1 order residual are calculated using a second residual operator formula to obtain a k-1 order modal component; All the modal components of the order are calculated using the energy storage power calculation formula to obtain the energy storage power of the first k orders; The second residual operator formula is: The energy storage power calculation formula is: P BESS =P IMF1 +P IMF2 +…+P IMFk ; Where P IMEk is the kth order modal component, P RESk is the k-th order residual, w i is the i-th Gaussian white noise, M(*) is the residual operator, I is the total number of Gaussian white noise, P BESS is the energy storage power of the first k stages.

6. The comprehensive control method for a power fluctuation-smoothing energy storage system according to claim 1, characterized in that: The grid-connected power mathematical model includes a power expression and a fluctuation rate expression, and the power expression is: The volatility expression is: Where P g (t) is the grid-connected power at time t, P wl (t) is the output power of the lth generator set at time t, P BESS (t) is the energy storage power at time t, n is the total number of generator sets in the integrated energy storage system of renewable energy transmission, P1(t) is the fluctuation rate of 1min time scale at time t, P 10 (t) is the volatility of the 10-min time scale at time t, P w，rate The installed capacity of the power plant in the integrated energy storage system for renewable energy transmission, k t is the sampling interval, a and b are the sampling moments.

7. The comprehensive control method for a power fluctuation-smoothing energy storage system according to claim 1, characterized in that: The constraints are P1∈[0,1 / 10], P 10 ∈[0, 1 / 3], P1 is the volatility of 1min time scale, P 10 is the volatility on a 10-min time scale.

8. A comprehensive control device for a power fluctuation-smoothing energy storage system, applied to an integrated energy storage system for renewable energy transmission, wherein the integrated energy storage system for renewable energy transmission comprises an integrated energy storage module, characterized in that: The energy storage power double-layer control device comprises a data acquisition module, an initial calculation module, a first judgment module, a second judgment module and a control storage module; The data acquisition module is used to obtain the topological structure diagram, total power generation and initial value of modal decomposition order of the integrated energy storage system of the new energy power transmission, and construct a grid-connected power mathematical model according to the topological structure diagram; and add I Gaussian white noise to the total power generation to construct a power data set consisting of I data; The initial calculation module is used to calculate according to the initial value of the modal decomposition order using the primary modal decomposition calculation rule to obtain the primary modal component and the initial energy storage power; Inputting the initial energy storage power into the grid-connected power mathematical model to obtain initial fluctuation rates corresponding to the primary modal component at two time scales; The first judgment module is used to use the initial energy storage power as the smoothing power of the integrated energy storage system for new energy power transmission according to the initial volatility under two time scales satisfying the constraint conditions; The second judgment module is used to update the modal decomposition order according to the initial volatility under two time scales not satisfying the constraint conditions; calculate according to the modal decomposition order using the k-th modal decomposition calculation rule to obtain the order modal component and the energy storage power; input the energy storage power into the grid-connected power mathematical model to obtain the updated volatility corresponding to the order modal component at two time scales, until the updated volatility satisfies the constraint conditions, and use the energy storage power corresponding to the updated volatility that satisfies the constraint conditions as the smoothing power of the integrated energy storage system for new energy power transmission; The control storage module is used to control the integrated energy storage module to store the smoothed power by adopting an energy storage integrated control mode.

9. The integrated control device for smoothing power fluctuation energy storage system according to claim 8, characterized in that: The integrated energy storage module includes a first energy storage element, a second energy storage element and a third energy storage element, and the content of the energy storage integrated control mode includes: Obtain parameter data of the integrated energy storage module, the parameter data including charging rated power, discharging rated power, rated energy storage power, rated energy storage capacity, charging and discharging upper limit, charging and discharging lower limit, Limits, operating efficiency parameters and power control cycles; According to the parameter data, the charging power, discharging power, remaining amount of charging energy storage and remaining amount of discharging energy storage of the integrated energy storage module are calculated; According to the charge and discharge upper limit value, the charge and discharge lower limit value, the charging power and the discharging power, the first energy storage element, the second energy storage element and the third energy storage element are controlled to switch and store the smoothing power in thirteen operating conditions; The thirteen operating conditions include a first operating condition, a second operating condition, a third operating condition, a fourth operating condition, a fifth operating condition, a sixth operating condition, a seventh operating condition, an eighth operating condition, a ninth operating condition, a tenth operating condition, an eleventh operating condition, a twelfth operating condition and a thirteenth operating condition; When the integrated energy storage module is in the first operating condition, a first energy storage quantity charged by the first energy storage element at the charging power and a first remaining quantity discharged by the second energy storage element at the discharging power are obtained; if the first energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the second operating condition; if the first remaining quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the third operating condition; When the integrated energy storage module is in the second operating condition, a second energy storage quantity charged by the third energy storage element at the charging power and a second remaining quantity discharged by the second energy storage element at the discharging power are obtained; if the second energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the fifth operating condition; if the second remaining quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the fourth operating condition; When the integrated energy storage module is in the third operating condition, a third energy storage quantity charged by the first energy storage element at the charging power and a third remaining quantity discharged by the third energy storage element at the discharging power are obtained; if the third energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the sixth operating condition; if the third remaining quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the seventh operating condition; When the integrated energy storage module is in the fourth operating condition, a fourth energy storage quantity charged by the second energy storage element at the charging power and a fourth remaining quantity discharged by the first energy storage element at the discharging power are obtained; if the fourth energy storage quantity reaches the charging and discharging upper limit value, the integrated energy storage module switches to the fifth operating condition; if the fourth remaining quantity reaches the The charging and discharging lower limit value, the integrated energy storage module switches to the eighth operating condition; When the integrated energy storage module is in the fifth operating condition, a fifth energy storage quantity charged by the second energy storage element at the charging power and a fifth remaining quantity discharged by the first energy storage element at the discharging power are obtained; if the fifth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the ninth operating condition; if the fifth remaining quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the eighth operating condition; When the integrated energy storage module is in the sixth operating condition, a sixth energy storage quantity charged by the second energy storage element at the charging power and a sixth remaining quantity discharged by the third energy storage element at the discharging power are obtained; if the sixth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the tenth operating condition; if the sixth remaining quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the seventh operating condition; When the integrated energy storage module is in the seventh operating condition, the seventh energy storage capacity charged by the second energy storage element at the charging power and the seventh remaining capacity discharged by the first energy storage element at the discharging power are obtained; if the seventh energy storage capacity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the tenth operating condition; if the seventh remaining capacity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the eleventh operating condition; When the integrated energy storage module is in the eighth operating condition, an eighth energy storage quantity charged by the second energy storage element at the charging power and an eighth remaining quantity discharged by the third energy storage element at the discharging power are obtained; if the eighth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the ninth operating condition; if the eighth remaining quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the twelfth operating condition; When the integrated energy storage module is in the ninth operating condition, a ninth energy storage quantity charged by the first energy storage element at the charging power and a ninth remaining quantity discharged by the third energy storage element at the discharging power are obtained; if the ninth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the second operating condition; if the ninth remaining quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the twelfth operating condition; When the integrated energy storage module is in the tenth operating condition, the tenth energy storage capacity charged by the third energy storage element at the charging power and the third remaining capacity discharged by the first energy storage element at the discharging power are obtained; if the tenth energy storage capacity reaches the charging and discharging upper limit value, The integrated energy storage module switches to the thirteenth operating condition; if the tenth remaining power reaches the charge and discharge lower limit, the integrated energy storage module switches to the eleventh operating condition; When the integrated energy storage module is in the eleventh operating condition, the eleventh energy storage quantity charged by the second energy storage element at the charging power and the twelfth remaining quantity discharged by the third energy storage element at the discharging power are obtained; if the eleventh energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the third operating condition; if the eleventh remaining quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the thirteenth operating condition; When the integrated energy storage module is in the twelfth operating condition, the twelfth energy storage quantity charged by the first energy storage element at the charging power and the twelfth residual quantity discharged by the second energy storage element at the discharging power are obtained; if the twelfth energy storage quantity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the second operating condition; if the twelfth residual quantity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the fourth operating condition; When the integrated energy storage module is in the thirteenth operating condition, the thirteenth energy storage capacity charged by the first energy storage element with the charging power and the thirteenth remaining capacity discharged by the second energy storage element with the discharging power are obtained; if the thirteenth energy storage capacity reaches the upper limit of charge and discharge, the integrated energy storage module switches to the sixth operating condition; if the thirteenth remaining capacity reaches the lower limit of charge and discharge, the integrated energy storage module switches to the third operating condition.

10. A terminal device, characterized in that: including a processor and a memory; The memory is used to store program codes and transmit the program codes to the processor; The processor is used to execute the comprehensive control method for smoothing power fluctuation energy storage system according to any one of claims 1-7 according to the instructions in the program code.

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