Hybrid energy storage AGC frequency modulation engineering economical efficiency improvement strategy method and system

Abstract

The invention discloses a hybrid energy storage AGC frequency modulation engineering economy improvement strategy method and system, and relates to the technical field of energy storage system AGC frequency modulation, and the method comprises the following steps: analyzing the charging and discharging behaviors of an energy storage system according to the unit load and the time sequence data of an AGC instruction; constructing an optimal output model under various working conditions to optimize a response strategy of the energy storage system; according to different AGC instruction types and durations, a proper energy storage medium is selected for response in a mode of combining a super capacitor and a lithium iron phosphate battery. The thermal power generating unit frequency modulation analysis and energy storage system frequency modulation simulation program is developed through autonomous programming, the thermal power generating unit frequency modulation working condition is analyzed, multiple parameters such as the whole life cycle investment cost, the daily average frequency modulation mileage and the daily average comprehensive frequency modulation performance of multiple hybrid energy storage configuration schemes are analyzed, the hybrid energy storage system configuration combination is optimized, and the hybrid energy storage system configuration efficiency is improved. And the hybrid energy storage system and the hybrid energy storage system AGC frequency modulation response strategy with the optimal engineering economy are obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of AGC frequency modulation of energy storage systems, and in particular to a strategy method and system for improving the economic efficiency of a hybrid energy storage AGC frequency modulation project. Background Art

[0002] Thermal power units generally have long response delays in frequency regulation commands, low ramp rates, and cannot accurately track grid dispatch commands. They also have regulation time delays, regulation deviations, and regulation reversals. The current energy storage system assists thermal power units in frequency regulation, which is limited by the capacity of energy storage devices. Its output power cannot track the command power for a long time. Most energy storage systems are based on lithium-ion battery technology. Lithium battery energy storage also has safety risks, cycle life limitations, and limited gains in frequency regulation benefits.

[0003] At present, the route and specification selection of hybrid energy storage systems for AGC frequency regulation are mostly based on the owner's investment scale and the advanced and technological innovation requirements of the demonstration project. The AGC frequency regulation strategy of the hybrid energy storage system is formulated based on the daily load data of the thermal power units and combined with the characteristics and scale of each technical route of the energy storage system. The current hybrid energy storage system AGC frequency regulation strategy does not process data in a sophisticated manner and does not fully consider the output of the thermal power units. Summary of the invention

[0004] In view of the problems existing in the existing hybrid energy storage AGC frequency modulation project economic improvement strategy method and system, the present invention is proposed.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention provides a hybrid energy storage AGC frequency modulation project economic efficiency improvement strategy method, which includes the following steps:

[0007] Analyze the charging and discharging behavior of the energy storage system based on the time series data of unit load and AGC instructions;

[0008] Construct the optimal output model under various working conditions to optimize the response strategy of the energy storage system;

[0009] By combining supercapacitors and lithium iron phosphate batteries, the appropriate energy storage medium is selected to respond according to different AGC command types and durations.

[0010] As a preferred solution of the hybrid energy storage AGC frequency modulation engineering economic improvement strategy method of the present invention, it also includes:

[0011] For AGC commands that last no longer than three minutes, supercapacitors are used for quick response, and when the supercapacitors are insufficient to complete the entire command, lithium iron phosphate batteries supplement the remaining power;

[0012] When three consecutive same-direction commands appear, the supercapacitor responds to the same command three times in a row;

[0013] When the power is insufficient or the command is initially deviated, the life and efficiency of the energy storage system are balanced through different working modes;

[0014] For energy storage systems that are close to being fully charged or fully discharged, supercapacitors are used to perform pulse responses to reduce the number of cycles of the lithium iron phosphate battery.

[0015] As a preferred solution of the hybrid energy storage AGC frequency modulation engineering economic improvement strategy method of the present invention, wherein: the working mode includes:

[0016] When the energy storage system is fully charged, the supercapacitor priority strategy is adopted, that is, the supercapacitor responds to the AGC command in a short period of time first, and the lithium iron phosphate battery only supplements the remaining power when necessary;

[0017] When the energy storage system power cannot cover a certain AGC instruction, the SOC level of the lithium iron phosphate battery is protected, while allowing the supercapacitor to operate in the entire 10% to 90% range;

[0018] When there is a large deviation in the initial stage and the AGC instructions are in the opposite direction, the unit’s own regulation function is used to narrow the gap first, and then the energy storage system intervenes to assist until the balance point is reached;

[0019] When the energy storage system is close to being fully charged or fully discharged, the supercapacitor performs a pulse response to avoid unnecessary charging and discharging of the lithium iron phosphate battery.

[0020] In case of large initial deviations, the supercapacitor is activated to provide immediate support to prevent further deviation from the target power.

[0021] As a preferred solution of the hybrid energy storage AGC frequency modulation project economic improvement strategy method of the present invention, wherein: the economic optimal allocation method involves:

[0022] Input the specifications of each energy storage system, daily AGC instructions and unit output second-level data, daily unit average regulation rate, and energy conversion efficiency into the simulation software program to calculate the daily frequency regulation mileage, comprehensive frequency regulation performance, and charge and discharge capacity of the energy storage system;

[0023] The data of AGC units put into operation on two days each month are selected for analysis. The daily average data is obtained by weighted averaging the frequency regulation mileage, K value, and charge and discharge amount of a single day. This is used to evaluate the performance of different configuration schemes and select the best one.

[0024] As a preferred solution of the hybrid energy storage AGC frequency modulation engineering economic improvement strategy method of the present invention, it also includes the following steps:

[0025] Use MATLAB or other programming tools to pre-process and statistically analyze the collected data, and guide the parameter setting in practical applications based on the distribution characteristics of AGC instructions and their requirements for energy storage systems, including:

[0026] Construct output model: According to the time series data of unit load and AGC instruction, establish the optimal output model under different working conditions to optimize the response strategy of the energy storage system;

[0027] According to the calculation of the optimal output model, if the AGC command duration is ≤3 minutes, the energy storage system should give priority to using supercapacitors for rapid response;

[0028] If the supercapacitor is not enough to complete the entire command, the lithium iron phosphate battery supplements the remaining power;

[0029] When three consecutive same-direction instructions appear, the energy storage system should ensure that the supercapacitor responds to the same instruction three times in a row;

[0030] In case of insufficient power or large initial deviation of instructions, a specific working mode is adopted to balance the life and efficiency of the energy storage system;

[0031] Analyze the distribution characteristics of AGC commands within a month. When the energy storage system is close to being fully charged or fully discharged, only supercapacitors are used for pulse response to reduce the number of cycles of lithium iron phosphate batteries.

[0032] The obtained configuration scheme of the hybrid energy storage system is used to optimally match the economy and operating life to achieve long-term stable frequency regulation services.

[0033] In a second aspect, an embodiment of the present invention provides a hybrid energy storage AGC frequency modulation project economic efficiency improvement strategy system, which includes a hybrid energy storage system,

[0034] The hybrid energy storage system uses the hybrid energy storage system controller as the control core, and realizes the generator responding to the instructions issued by the AGC system through the combination of supercapacitors and lithium iron phosphate batteries, thereby reducing the adjustment time of the generator while avoiding or reducing the impact on the thermal power unit;

[0035] The hybrid energy storage system is a hybrid energy storage system composed of a super capacitor and a lithium iron phosphate battery. The hybrid energy storage system includes an energy storage system, and the energy storage system includes a super capacitor and a lithium iron phosphate battery;

[0036] The supercapacitor is connected in parallel with the lithium iron phosphate battery, the supercapacitor realizes a rapid response to the load of the unit, and the lithium iron phosphate battery is used for long-term frequency modulation service;

[0037] The hybrid energy storage system controller uses the hybrid energy storage system as an actuator. The hybrid energy storage system controller controls the energy storage system according to the working conditions to achieve the response to the AGC instruction.

[0038] As a preferred solution of the hybrid energy storage AGC frequency modulation engineering economic improvement strategy system described in the present invention, the hybrid energy storage system controller includes a generator response module, an analysis module, a model building module, a medium selection module, and a control module.

[0039] As a preferred solution of the hybrid energy storage AGC frequency modulation engineering economic improvement strategy system of the present invention, wherein: the analysis module, based on the statistical analysis of the time series data of the unit load and the AGC instruction, constructs the optimal output model under various working conditions to optimize the response strategy of the energy storage system, analyzes the charging and discharging behavior of the energy storage system according to the time series data of the unit load and the AGC instruction, and constructs the optimal output model under various working conditions;

[0040] The medium selection module is used to select energy storage medium to respond according to different AGC instruction types and durations by combining supercapacitors and lithium iron phosphate batteries;

[0041] The control module is used to adopt an overcapacity priority strategy when the energy storage system is fully charged, and is also used for the hybrid energy storage system controller to use the hybrid energy storage system as an actuator to control the hybrid energy storage system to respond to AGC instructions, and is used to input the specifications of each energy storage system, daily AGC instructions and unit output second-level data, daily unit average regulation rate, and energy conversion efficiency into a simulation software program, and to count the daily frequency regulation mileage, comprehensive frequency regulation performance, and charge and discharge capacity of the energy storage system. The unit data of AGC put into operation on two days each month are selected for analysis, and the daily frequency regulation mileage, K value, and charge and discharge capacity are weighted averaged to obtain daily average data, so as to evaluate the performance of different configuration schemes and select the best one.

[0042] In a third aspect, an embodiment of the present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, wherein: when the processor executes the computer program, any step of the above-mentioned hybrid energy storage AGC frequency modulation project economic efficiency improvement strategy method is implemented.

[0043] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, any step of the above-mentioned hybrid energy storage AGC frequency modulation project economic efficiency improvement strategy method is implemented.

[0044] The beneficial effects of the present invention are as follows: by independently programming, a frequency regulation analysis program for thermal power units and a frequency regulation simulation program for energy storage systems are developed, the frequency regulation conditions of thermal power units are analyzed, the hybrid energy storage system is optimized to respond to the thermal-storage frequency regulation strategy, and multiple parameters such as the full life cycle investment cost, average daily frequency regulation mileage, and average daily comprehensive frequency regulation performance of various hybrid energy storage configuration schemes are analyzed, the configuration combination of the hybrid energy storage system is optimized, and the hybrid energy storage system and the AGC frequency regulation response strategy of the hybrid energy storage system with the best engineering economics are obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0046] Figure 1 Scenario diagram of the strategy method for improving the economic efficiency of hybrid energy storage AGC frequency modulation project.

[0047] Figure 2 This is the unit output and AGC command data requirement diagram for the hybrid energy storage AGC frequency regulation project economic improvement strategy method.

[0048] Figure 3 This is a statistical result diagram of the unit AGC command for the hybrid energy storage AGC frequency regulation project economic improvement strategy method.

[0049] Figure 4 This is the unit AGC command statistics table for the economic improvement strategy method of the hybrid energy storage AGC frequency regulation project.

[0050] Figure 5 This is a statistical table of unit AGC same-direction instructions for the strategy method to improve the economic efficiency of the hybrid energy storage AGC frequency regulation project.

[0051] Figure 6 Various complex operating condition diagrams of thermal storage frequency regulation are provided for the strategy method of improving the economic efficiency of hybrid energy storage AGC frequency regulation project.

[0052] Figure 7 This is a graph showing the proportion of various types of operating conditions for the strategy method to improve the economic efficiency of the hybrid energy storage AGC frequency regulation project.

[0053] Figure 8This is the Plecs software modeling interface diagram for the economic improvement strategy method of hybrid energy storage AGC frequency regulation project.

[0054] Fig. 9 A single-day energy storage system frequency regulation data chart showing the strategy method for improving the economic efficiency of the hybrid energy storage AGC frequency regulation project.

[0055] Fig.10 This is an example scheme diagram of a strategy method for improving the economic efficiency of a hybrid energy storage AGC frequency regulation project. DETAILED DESCRIPTION

[0056] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0057] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0058] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0059] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0060] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] Example 1

[0063] Reference Figures 1 to 10 , which is the first embodiment of the present invention, and provides a hybrid energy storage AGC frequency modulation project economic efficiency improvement strategy method, comprising the following steps:

[0064] S1. Analyze the charging and discharging behavior of the energy storage system based on the time series data of unit load and AGC instructions.

[0065] First, prepare the data, such as Figure 2 As shown, the time data of unit load and AGC instruction are in xls format, which can be directly opened with excel or wps software. The first column is time, which is required to be second-level data or data with higher precision, that is, the time interval between two data points is required to be less than or equal to 1 second; the second column is the unit output at the current time, in megawatts (MW); the third column is the AGC instruction at the current time, in megawatts (MW).

[0066] Through the matlab program, the AGC instructions of the unit are comprehensively analyzed, and the instruction span and corresponding proportion and the distribution of the same-direction instructions are analyzed. Figures 3 to 5 As shown, about 74% of the AGC instructions last less than 1 minute, and the probability of ≤3 consecutive AGC instructions in the same direction is about 75%. The hybrid energy storage system of this scheme takes the hybrid energy storage system of lithium iron phosphate battery and supercapacitor as an example. Based on the above analysis results, in order to enable the supercapacitor energy storage SOC to be 50%, it can continuously respond to 3 AGC instructions in the same direction and lasting for 1 minute, and the configured supercapacitor is at least 6 minutes.

[0067] S2. Construct the optimal output model under various operating conditions to optimize the response strategy of the energy storage system.

[0068] For AGC commands that last no longer than three minutes, supercapacitors are used for quick response, and when the supercapacitors are insufficient to complete the entire command, lithium iron phosphate batteries supplement the remaining power;

[0069] When three consecutive same-direction commands appear, the supercapacitor responds to the same command three times in a row;

[0070] When the power is insufficient or the command is initially deviated, the life and efficiency of the energy storage system are balanced through different working modes;

[0071] For energy storage systems that are close to being fully charged or fully discharged, supercapacitors are used to perform pulse responses to reduce the number of cycles of the lithium iron phosphate battery.

[0072] According to the AGC instructions and the unit regulation rate, the response strategy of the hybrid energy storage system under various frequency regulation conditions is analyzed, namely Figure 6 shown.

[0073] Working modes include:

[0074] When the energy storage system is fully charged, the supercapacitor priority strategy is adopted, that is, the supercapacitor responds to the AGC command in a short period of time first, and the lithium iron phosphate battery only supplements the remaining power when necessary;

[0075] When the energy storage system power cannot cover a certain AGC instruction, the SOC level of the lithium iron phosphate battery is protected, while allowing the supercapacitor to operate in the entire 10% to 90% range;

[0076] When there is a large deviation in the initial stage and the AGC instructions are in the opposite direction, the unit’s own regulation function is used to narrow the gap first, and then the energy storage system intervenes to assist until the balance point is reached;

[0077] When the energy storage system is close to being fully charged or fully discharged, the supercapacitor performs a pulse response to avoid unnecessary charging and discharging of the lithium iron phosphate battery.

[0078] In case of large initial deviations, the supercapacitor is activated to provide immediate support to prevent further deviation from the target power.

[0079] Right now,

[0080] Type 1, the power of the unit + hybrid energy storage is perfectly matched with the AGC target power. When the AGC instruction is within 3 minutes and the hybrid energy storage system is fully charged, the hybrid energy storage system adopts the "supercapacitor priority" strategy, that is, the supercapacitor responds first when facing instructions within 3 minutes. When the supercapacitor can respond to the complete instruction, the lithium iron phosphate battery system does not need to output. When the supercapacitor energy storage system power is insufficient but the remaining power is within the range of the lithium iron phosphate battery response energy conversion efficiency input into the simulation software program, the remaining power is responded by the lithium iron phosphate battery system, thereby reducing the number of cycles of the lithium iron phosphate battery and extending the service life of the lithium iron phosphate battery.

[0081] Type 2, the power of the unit + energy storage is partially consistent with the AGC target power. The power of the hybrid energy storage system is insufficient during operation. The lithium iron phosphate battery will exit the response first to keep the power in the range of 20-80% SOC. The supercapacitor system will exit the response later to keep the power in the range of 10-90%, thereby ensuring the service life while improving the regulation rate and response time indicators of the fire storage system of the instruction.

[0082] Type 3, at the beginning of the command, the deviation between the AGC target power and the unit power is too large. First, wait for the unit's own load to gradually adjust to narrow the gap between the unit output and the command. When the difference between the command and the output is reduced to the power range of the energy storage system, the supercapacitor and the lithium iron phosphate battery jointly output. If the AGC command time is too long, the lithium iron phosphate battery will first exit the response, followed by the supercapacitor.

[0083] Type 4, when the energy storage capacity is close to being fully charged or fully discharged, the supercapacitor system performs a pulse response, and the lithium iron phosphate battery does not respond, thereby improving the regulation rate and response time indicators corresponding to the thermal power unit under this instruction.

[0084] Type 5, at the initial stage of the instruction, the deviation between the AGC target power and the unit power is too large and the direction of the unit power change is contrary to the target. The supercapacitor system performs a pulse response, and the lithium iron phosphate battery does not respond, thereby improving the corresponding response time index of the thermal power unit under this instruction.

[0085] Reference Figure 7 As shown in the figure, by analyzing the proportion of each type of operating condition, it is possible to estimate the improvement of the hybrid energy storage system on the regulation rate, regulation accuracy and response time indicators of the thermal power units.

[0086] S3. By combining supercapacitors and lithium iron phosphate batteries, appropriate energy storage media are selected to respond according to different AGC command types and durations.

[0087] According to the AGC instruction type and the unit regulation rate, various configuration schemes of the hybrid energy storage system are analyzed to determine the hybrid energy storage system configuration scheme with the best engineering economics. Take a 350MW unit equipped with 12MW energy storage frequency regulation project as an example: the unit standard rate is 1%Pe / min, it participates in frequency regulation for 300 days per year, and the energy storage system operates for 10 years; the 1C rate lithium iron phosphate battery 100% DOD cycle life is 3700 times, and the energy conversion efficiency is 80%; the 10C rate supercapacitor 100% DOD cycle life is 75000 times, and the energy conversion efficiency is 90%. Input the specifications of each energy storage system, the daily AGC instruction and unit output second-level data, the daily unit average regulation rate, and the energy conversion efficiency into the Plecs software program, such as Figure 8 As shown in the figure, the frequency regulation mileage, comprehensive frequency regulation performance (K value), and charge and discharge of the energy storage system are counted for a single day. The energy storage system data is shown in the figure below. Fig. 9As shown in the figure, the data of the AGC units put into operation on two days each month are selected for analysis, and the daily average data is obtained by weighted averaging the frequency regulation mileage, K value, and charge and discharge amount of a single day.

[0088] The 12MW hybrid energy storage system can be divided into a variety of supercapacitor + lithium iron phosphate battery configuration schemes. Taking 2MW as an example, there are 7 configuration schemes, such as Fig.10 As shown, the actual configuration combination needs to be communicated with the manufacturer and combined flexibly. Through Plecs modeling and simulation of 7 hybrid energy storage systems with different configurations, the average daily frequency regulation mileage, average daily charge and discharge capacity, and replacement time of the supercapacitor system and lithium iron phosphate battery system of the configuration scheme energy storage system were obtained (the operation time of the energy storage system is assumed to be 10 years). In this way, the investment cost of each scheme over the entire life cycle and the static payback period index (total investment cost / (frequency regulation mileage×K value)) were calculated, and the hybrid energy storage system configuration scheme with the best engineering economics was obtained. According to Fig. 9 The data in the table shows that the lowest investment cost (converted to the first year) of the hybrid energy storage system configuration is the "4MW supercapacitor + 8MW lithium iron phosphate battery" energy storage system, with a total investment of 33.6 million yuan, an average daily frequency regulation mileage of 34.01 million yuan, an average daily K value of 0.826, and a static recovery cycle index of 1.2. The smaller the index value, the earlier the investment cost is recovered and the stronger the engineering economy. Therefore, in the "12MW hybrid energy storage system" case, the "4MW supercapacitor + 8MW lithium iron phosphate battery" energy storage system is the optimal engineering economy solution.

[0089] The following steps are also included:

[0090] Use MATLAB or other programming tools to pre-process and statistically analyze the collected data, and guide the parameter setting in practical applications based on the distribution characteristics of AGC instructions and their requirements for energy storage systems, including:

[0091] Construct output model: According to the time series data of unit load and AGC instruction, establish the optimal output model under different working conditions to optimize the response strategy of the energy storage system;

[0092] According to the calculation of the optimal output model, if the AGC command duration is ≤3 minutes, the energy storage system should give priority to using supercapacitors for rapid response;

[0093] If the supercapacitor is not enough to complete the entire command, the lithium iron phosphate battery supplements the remaining power;

[0094] When three consecutive same-direction instructions appear, the energy storage system should ensure that the supercapacitor responds to the same instruction three times in a row;

[0095] In case of insufficient power or large initial deviation of instructions, a specific working mode is adopted to balance the life and efficiency of the energy storage system;

[0096] Analyze the distribution characteristics of AGC commands within a month. When the energy storage system is close to being fully charged or fully discharged, only supercapacitors are used for pulse response to reduce the number of cycles of lithium iron phosphate batteries.

[0097] The obtained configuration scheme of the hybrid energy storage system is used to optimally match the economy and operating life to achieve long-term stable frequency regulation services.

[0098] In summary, through independent programming, a frequency regulation analysis program for thermal power units and a frequency regulation simulation program for energy storage systems are developed to analyze the frequency regulation conditions of thermal power units, optimize the hybrid energy storage system's response to the thermal-storage frequency regulation strategy, analyze multiple parameters such as the full life cycle investment cost, average daily frequency regulation mileage, and average daily comprehensive frequency regulation performance of various hybrid energy storage configuration schemes, optimize the configuration combination of the hybrid energy storage system, and obtain the hybrid energy storage system with the best engineering economics and the hybrid energy storage system's AGC frequency regulation response strategy.

[0099] Example 2

[0100] On the basis of the first embodiment, this embodiment further provides a hybrid energy storage AGC frequency modulation project economic efficiency improvement strategy system, including a hybrid energy storage system,

[0101] The hybrid energy storage system uses the hybrid energy storage system controller as the control core, and realizes the generator responding to the instructions issued by the AGC system through the combination of supercapacitors and lithium iron phosphate batteries, thereby reducing the adjustment time of the generator while avoiding or reducing the impact on the thermal power unit;

[0102] The hybrid energy storage system is a hybrid energy storage system composed of a super capacitor and a lithium iron phosphate battery. The hybrid energy storage system includes an energy storage system, and the energy storage system includes a super capacitor and a lithium iron phosphate battery;

[0103] The supercapacitor is connected in parallel with the lithium iron phosphate battery, the supercapacitor realizes a rapid response to the load of the unit, and the lithium iron phosphate battery is used for long-term frequency modulation service;

[0104] The hybrid energy storage system controller uses the hybrid energy storage system as an actuator. The hybrid energy storage system controller controls the energy storage system according to the working conditions to achieve the response to the AGC instruction.

[0105] The hybrid energy storage system controller includes a generator response module, an analysis module, a model building module, a medium selection module, and a control module.

[0106] The analysis module constructs an optimal output model under various working conditions based on statistical analysis of the time series data of the unit load and the AGC command to optimize the response strategy of the energy storage system, analyzes the charging and discharging behavior of the energy storage system according to the time series data of the unit load and the AGC command, and constructs the optimal output model under various working conditions;

[0107] The medium selection module is used to select energy storage medium to respond according to different AGC instruction types and durations by combining supercapacitors and lithium iron phosphate batteries;

[0108] The control module is used to adopt an overcapacity priority strategy when the energy storage system is fully charged, and is also used for the hybrid energy storage system controller to use the hybrid energy storage system as an actuator to control the hybrid energy storage system to respond to AGC instructions, and is used to input the specifications of each energy storage system, daily AGC instructions and unit output second-level data, daily unit average regulation rate, and energy conversion efficiency into a simulation software program, and to count the daily frequency regulation mileage, comprehensive frequency regulation performance, and charge and discharge capacity of the energy storage system. The unit data of AGC put into operation on two days each month are selected for analysis, and the daily frequency regulation mileage, K value, and charge and discharge capacity are weighted averaged to obtain daily average data, so as to evaluate the performance of different configuration schemes and select the best one.

[0109] This embodiment also provides a computer device, which is applicable to the situation of a hybrid energy storage AGC frequency modulation project economic efficiency improvement strategy method, including a memory and a processor; the memory is used to store computer executable instructions, and the processor is used to execute computer executable instructions to implement the hybrid energy storage AGC frequency modulation project economic efficiency improvement strategy method proposed in the above embodiment.

[0110] The computer device may be a terminal, and the computer device includes a processor, a memory, a communication interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covering the display screen, or a key, trackball or touchpad provided on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0111] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the method for realizing the economic efficiency improvement strategy of hybrid energy storage AGC frequency modulation project proposed in the above embodiment is implemented.

[0112] The storage medium proposed in this embodiment and the data storage method proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be found in the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0113] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A hybrid energy storage AGC frequency modulation project economic improvement strategy method, characterized by: The following steps are included: Analyze the charging and discharging behavior of the energy storage system based on the time series data of unit load and AGC instructions; Construct the optimal output model under various working conditions to optimize the response strategy of the energy storage system; By combining supercapacitors and lithium iron phosphate batteries, the appropriate energy storage medium is selected to respond according to different AGC command types and durations.

2. The hybrid energy storage AGC frequency modulation engineering economic efficiency improvement strategy method according to claim 1, characterized in that: Also includes, For AGC commands that last no longer than three minutes, supercapacitors are used for quick response, and when the supercapacitors are insufficient to complete the entire command, lithium iron phosphate batteries supplement the remaining power; When three consecutive same-direction commands appear, the supercapacitor responds to the same command three times in a row; When the power is insufficient or the command is initially deviated, the life and efficiency of the energy storage system are balanced through different working modes; For energy storage systems that are close to being fully charged or fully discharged, supercapacitors are used to perform pulse responses to reduce the number of cycles of the lithium iron phosphate battery.

3. The hybrid energy storage AGC frequency modulation engineering economic efficiency improvement strategy method according to claim 2, characterized in that: The working modes include: When the energy storage system is fully charged, the supercapacitor priority strategy is adopted, that is, the supercapacitor responds to the AGC command in a short period of time first, and the lithium iron phosphate battery only supplements the remaining power when necessary; When the energy storage system power cannot cover a certain AGC instruction, the SOC level of the lithium iron phosphate battery is protected, while allowing the supercapacitor to operate in the entire 10% to 90% range; When there is a large deviation in the initial stage and the AGC instructions are in the opposite direction, the unit’s own regulation function is used to narrow the gap first, and then the energy storage system intervenes to assist until the balance point is reached; When the energy storage system is close to being fully charged or fully discharged, the supercapacitor performs a pulse response to avoid unnecessary charging and discharging of the lithium iron phosphate battery. In case of large initial deviations, the supercapacitor is activated to provide immediate support to prevent further deviation from the target power.

4. The hybrid energy storage AGC frequency modulation engineering economic efficiency improvement strategy method as claimed in claim 3, characterized in that: The economically optimal allocation method involves: Input the specifications of each energy storage system, daily AGC instructions and unit output second-level data, daily unit average regulation rate, and energy conversion efficiency into the simulation software program to calculate the daily frequency regulation mileage, comprehensive frequency regulation performance, and charge and discharge capacity of the energy storage system; The data of AGC units put into operation on two days each month are selected for analysis. The daily average data is obtained by weighted averaging the frequency regulation mileage, K value, and charge and discharge amount of a single day. This is used to evaluate the performance of different configuration schemes and select the best one.

5. The hybrid energy storage AGC frequency modulation engineering economic efficiency improvement strategy method according to any one of claims 1 to 4, characterized in that: The following steps are also included: Use MATLAB or other programming tools to pre-process and statistically analyze the collected data, and guide the parameter setting in practical applications based on the distribution characteristics of AGC instructions and their requirements for energy storage systems, including: Construct output model: According to the time series data of unit load and AGC instruction, establish the optimal output model under different working conditions to optimize the response strategy of the energy storage system; According to the calculation of the optimal output model, if the AGC command duration is ≤3 minutes, the energy storage system should give priority to using supercapacitors for rapid response; If the supercapacitor is not enough to complete the entire command, the lithium iron phosphate battery supplements the remaining power; When three consecutive same-direction instructions appear, the energy storage system should ensure that the supercapacitor responds to the same instruction three times in a row; In case of insufficient power or large initial deviation of instructions, a specific working mode is adopted to balance the life and efficiency of the energy storage system; Analyze the distribution characteristics of AGC commands within a month. When the energy storage system is close to being fully charged or fully discharged, only supercapacitors are used for pulse response to reduce the number of cycles of lithium iron phosphate batteries. The obtained configuration scheme of the hybrid energy storage system is used to optimally match the economy and operating life to achieve long-term stable frequency regulation services.

6. A hybrid energy storage AGC frequency modulation project economic efficiency improvement strategy system, based on the hybrid energy storage AGC frequency modulation project economic efficiency improvement strategy method according to any one of claims 1 to 5, characterized in that: Including hybrid energy storage systems, The hybrid energy storage system uses the hybrid energy storage system controller as the control core, and realizes the generator responding to the instructions issued by the AGC system through the combination of supercapacitors and lithium iron phosphate batteries, thereby reducing the adjustment time of the generator while avoiding or reducing the impact on the thermal power unit; The hybrid energy storage system is a hybrid energy storage system composed of a super capacitor and a lithium iron phosphate battery. The hybrid energy storage system includes an energy storage system, and the energy storage system includes a super capacitor and a lithium iron phosphate battery; The supercapacitor is connected in parallel with the lithium iron phosphate battery, the supercapacitor realizes a rapid response to the load of the unit, and the lithium iron phosphate battery is used for long-term frequency modulation service; The hybrid energy storage system controller uses the hybrid energy storage system as an actuator. The hybrid energy storage system controller controls the energy storage system according to the working conditions to achieve the response to the AGC instruction.

7. The hybrid energy storage AGC frequency modulation engineering economic efficiency improvement strategy system according to claim 6, characterized in that: The hybrid energy storage system controller includes a generator response module, an analysis module, a model building module, a medium selection module, and a control module.

8. The hybrid energy storage AGC frequency modulation engineering economic efficiency improvement strategy system according to claim 6, characterized in that: The analysis module constructs an optimal output model under various working conditions based on statistical analysis of the time series data of the unit load and the AGC command to optimize the response strategy of the energy storage system, analyzes the charging and discharging behavior of the energy storage system according to the time series data of the unit load and the AGC command, and constructs the optimal output model under various working conditions; The medium selection module is used to select energy storage medium to respond according to different AGC instruction types and durations by combining supercapacitors and lithium iron phosphate batteries; The control module is used to adopt an overcapacity priority strategy when the energy storage system is fully charged, and is also used for the hybrid energy storage system controller to use the hybrid energy storage system as an actuator to control the hybrid energy storage system to respond to AGC instructions, and is used to input the specifications of each energy storage system, daily AGC instructions and unit output second-level data, daily unit average regulation rate, and energy conversion efficiency into a simulation software program, and to count the daily frequency regulation mileage, comprehensive frequency regulation performance, and charge and discharge capacity of the energy storage system. The unit data of AGC put into operation on two days each month are selected for analysis, and the daily frequency regulation mileage, K value, and charge and discharge capacity are weighted averaged to obtain daily average data, so as to evaluate the performance of different configuration schemes and select the best one.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the hybrid energy storage AGC frequency modulation project economic efficiency improvement strategy method described in any one of claims 1 to 5 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the hybrid energy storage AGC frequency modulation project economic efficiency improvement strategy method described in any one of claims 1 to 5 are implemented.

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