Hybrid energy storage system control method and device, electronic equipment and storage medium

Abstract

The invention relates to the field of wind power plant frequency modulation and hybrid energy storage system control, and provides a hybrid energy storage system control method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining the real-time operation data of a wind turbine generator and a hybrid energy storage system; calculating target power of the hybrid energy storage system based on the real-time operation data; based on the real-time operation data, whether the super capacitor and the lithium battery are both in the corresponding preset charge state intervals or not is judged, and if not, the hybrid energy storage system is controlled to enter a forced charge and discharge state; judging whether the absolute value of the target power of the hybrid energy storage system is smaller than a power dead zone or not based on the real-time operation data, and if yes, controlling the hybrid energy storage system to enter a charge-discharge recovery state; and judging whether a normal charging and discharging condition is met based on the real-time operation data, and if yes, controlling the hybrid energy storage system to enter a normal charging and discharging state. According to the invention, the supercapacitor can bear high-frequency fluctuation to reduce the service life loss of the lithium battery, and the secondary frequency modulation capability of the hybrid energy storage system is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wind farm frequency modulation and hybrid energy storage system control, and in particular to a hybrid energy storage system control method and device, electronic equipment, and storage medium. Background Art

[0002] As an important part of renewable energy, wind power has a large fluctuation in output power, which will bring challenges to the stable operation of the power grid. At the same time, the load of the power grid is also constantly changing. Therefore, wind farms need to have the ability to regulate active power to ensure the stability of the frequency of the power grid. The grid connection of large-scale wind turbines requires wind power plants to have primary frequency regulation capabilities. To this end, existing wind farms are usually equipped with an Automatic Generation Control (AGC) system to receive and automatically execute AGC instructions sent by the power dispatching agency. However, the existing technology mainly involves the primary frequency regulation of wind farms, and there is relatively little research on the secondary frequency regulation of wind farms.

[0003] Wind turbines usually operate in maximum power tracking mode. When the grid frequency drops, they cannot provide additional active power to support the secondary frequency regulation of the grid. Therefore, it is necessary to obtain sufficient active reserve through load reduction measures. However, the frequency regulation capacity provided by the wind farm is limited, so new control methods are needed to meet the needs of secondary frequency regulation. In the prior art, the use of energy storage systems to assist wind power plants can reduce the load reduction reserve power of wind farms through the rapid response capability of the energy storage system, and quickly respond to the needs of secondary frequency regulation of the grid.

[0004] Hybrid energy storage systems combined with wind power have obvious advantages over single energy storage systems, such as improving the system's regulation capability and energy utilization efficiency. The current wind-storage combined system mainly relies on lithium batteries as energy storage devices. However, although lithium batteries have high energy density and fast charge and discharge speeds, their cycle life is relatively short, and their efficiency gradually decreases in high-frequency charge and discharge cycles. For this reason, a new energy storage system design is urgently needed, and effective control is required to improve the overall energy efficiency of the system and extend the service life of lithium batteries. Summary of the invention

[0005] The present disclosure aims to solve at least one of the problems existing in the prior art and provides a hybrid energy storage system control method and device, electronic equipment, and storage medium.

[0006] In one aspect of the present disclosure, a hybrid energy storage system control method is provided, the control method comprising:

[0007] Obtain real-time operating data of wind turbines and hybrid energy storage systems;

[0008] Calculating the target power of the hybrid energy storage system based on the real-time operation data;

[0009] Based on the real-time operation data, determining whether the supercapacitor and the lithium battery are both in the corresponding preset state of charge intervals, and if not, controlling the hybrid energy storage system to enter a forced charge and discharge state;

[0010] Based on the real-time operation data, determining whether the absolute value of the target power of the hybrid energy storage system is less than the power dead zone, and if so, controlling the hybrid energy storage system to enter a recovery charging and discharging state;

[0011] Based on the real-time operation data, it is determined whether normal charging and discharging conditions are met. If so, the hybrid energy storage system is controlled to enter a normal charging and discharging state.

[0012] Optionally, the calculating the target power of the hybrid energy storage system based on the real-time operation data includes:

[0013] According to Formula 1, the target power of the hybrid energy storage system is calculated:

[0014] P R =P A -P F Formula 1;

[0015] Among them, P R represents the target power of the hybrid energy storage system, P A Indicates the power indicated by the automatic power generation control command, P F Indicates the power of wind turbine.

[0016] Optionally, when the hybrid energy storage system is in the forced charge and discharge state, if the state of charge of the supercapacitor exceeds its corresponding maximum value, and the lithium battery is in the corresponding preset state of charge interval, the target power of the supercapacitor and the lithium battery is expressed as Formula 2:

[0017]

[0018] Among them, P C represents the target power of the supercapacitor, P L represents the target power of the lithium battery, P CF represents the forced discharge power of the supercapacitor, P Lmax Indicates the maximum output power of the lithium battery.

[0019] Optionally, when the hybrid energy storage system is in the forced charge and discharge state, if the state of charge of the lithium battery exceeds its corresponding maximum value, and the supercapacitor is in the corresponding preset state of charge interval, the target power of the supercapacitor and the lithium battery is expressed as Formula 3:

[0020]

[0021] Among them, P C represents the target power of the supercapacitor, P L represents the target power of the lithium battery, P LF Indicates the forced discharge power of the lithium battery, P Cmax represents the maximum output power of the supercapacitor.

[0022] Optionally, when the hybrid energy storage system is in the forced charge and discharge state, if the state of charge of the supercapacitor exceeds its corresponding maximum value, and the state of charge of the lithium battery also exceeds its corresponding maximum value, then the target power of the supercapacitor and the target power of the lithium battery are both 0.

[0023] Optionally, when the target power of the hybrid energy storage system is in the power dead zone, the target power of the lithium battery is expressed as Formula 4, and the target power of the supercapacitor is expressed as Formula 5:

[0024]

[0025] Among them, P L represents the target power of the lithium battery, P LS Indicates the recovery discharge power of the lithium battery, S OCL represents the state of charge of the lithium battery, S0 represents the initial value of the state of charge;

[0026]

[0027] Among them, P C represents the target power of the supercapacitor, P CS represents the recovery discharge power of the supercapacitor, S OCC Indicates the state of charge of the supercapacitor.

[0028] Optionally, when the hybrid energy storage system is in a normal charging and discharging state, the discharging condition is expressed as Formula 6, and the charging condition is expressed as Formula 7:

[0029]

[0030] Among them, P C represents the target power of the supercapacitor, P Lrepresents the target power of the lithium battery, P Cmax represents the maximum output power of the supercapacitor, P Lmax Indicates the maximum output power of the lithium battery, P R (t) represents the target power of the hybrid energy storage system at time t.

[0031] Another aspect of the present disclosure provides a hybrid energy storage system control device, the control device comprising:

[0032] An acquisition module is used to obtain real-time operating data of wind turbines and hybrid energy storage systems;

[0033] A calculation module, used for calculating the target power of the hybrid energy storage system based on the real-time operation data;

[0034] A first control module, configured to determine, based on the real-time operation data, whether the supercapacitor and the lithium battery are both in a corresponding preset state of charge interval, and if not, control the hybrid energy storage system to enter a forced charge and discharge state;

[0035] A second control module is used to determine whether the absolute value of the target power of the hybrid energy storage system is less than the power dead zone based on the real-time operation data, and if so, control the hybrid energy storage system to enter a recovery charging and discharging state;

[0036] The third control module is used to determine whether normal charging and discharging conditions are met based on the real-time operation data, and if so, control the hybrid energy storage system to enter a normal charging and discharging state.

[0037] Another aspect of the present disclosure provides an electronic device, including:

[0038] at least one processor; and,

[0039] a memory communicatively connected to at least one processor; wherein,

[0040] The memory stores instructions that can be executed by at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the hybrid energy storage system control method described above.

[0041] Another aspect of the present disclosure provides a computer-readable storage medium storing a computer program, which implements the hybrid energy storage system control method described above when executed by a processor.

[0042] Compared with the prior art, the present invention improves the overall energy utilization efficiency of the hybrid energy storage system; reduces the number of cycles of lithium batteries and prolongs their service life; enhances the secondary frequency regulation capability of wind farms and stabilizes the grid frequency by optimizing the control strategy; and combines the advantages of high power density of supercapacitors and high energy density of lithium batteries to improve the response speed and regulation capability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0044] Figure 1 A flow chart of a hybrid energy storage system control method provided in one embodiment of the present disclosure;

[0045] Figure 2 A schematic structural diagram of a wind power-hybrid energy storage combined power plant provided in another embodiment of the present disclosure;

[0046] Figure 3 A schematic flow chart of a hybrid energy storage system control method provided in another embodiment of the present disclosure;

[0047] Figure 4 A schematic structural diagram of a hybrid energy storage system control device provided in another embodiment of the present disclosure;

[0048] Figure 5 A schematic structural diagram of an electronic device provided in another embodiment of the present disclosure. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical scheme and advantages of the embodiments of the present disclosure clearer, the embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. However, it can be understood by those skilled in the art that in each embodiment of the present disclosure, many technical details are proposed in order to enable readers to better understand the present disclosure. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed for protection in the present disclosure can also be implemented. The division of the following embodiments is for the convenience of description and should not constitute any limitation on the specific implementation of the present disclosure. The various embodiments can be combined and referenced with each other without contradiction.

[0050] One embodiment of the present disclosure relates to a hybrid energy storage system control method, the process of which is as follows: Figure 1 As shown, including:

[0051] Step S110, obtaining real-time operating data of the wind turbine and the hybrid energy storage system.

[0052] Specifically, Figure 2 The structure of a wind power-hybrid energy storage combined power plant is shown, and multiple wind power-hybrid energy storage units are connected to the regional power grid through a transformer via a grid connection point. Each wind power-hybrid energy storage unit includes a wind turbine, a supercapacitor, a lithium battery, an alternating current (AC) / direct current (DC) converter, a DC / DC converter, a DC / AC converter, etc. Among them, the hybrid energy storage system includes a supercapacitor and a lithium battery. For example, the transformer may include but is not limited to a 33KV / 110KV transformer, a 110KV / 33KV transformer, etc. The lithium battery may be, but is not limited to, a lithium iron phosphate battery.

[0053] For example, combining Figure 3 Step S110 can be performed by reading the power P indicated by the AGC instruction corresponding to the hybrid energy storage system. A , wind turbine power P F , the state of charge S of the supercapacitor OCC 、The state of charge S of lithium battery OCL , the power P indicated by the AGC instruction at the last moment A (t-1), etc., to obtain the real-time operation data of wind turbines and hybrid energy storage systems.

[0054] Step S120, calculating the target power of the hybrid energy storage system based on the real-time operation data.

[0055] Exemplary, combined Figure 3 , step S120 includes: calculating the target power of the hybrid energy storage system according to formula 1:

[0056] P R =P A -P F Formula 1.

[0057] Among them, P R Represents the target power of the hybrid energy storage system, which is used to characterize the target output of the hybrid energy storage system. A Indicates the power indicated by the automatic generation control instruction, i.e., the AGC instruction. F Indicates the power of wind turbine.

[0058] That is to say, step S120 can calculate the target power of the hybrid energy storage system according to the power indicated by the AGC instruction and the power of the wind turbine generator set.

[0059] Step S130, based on the real-time operation data, it is determined whether the supercapacitor and the lithium battery are both in the corresponding preset state of charge range. If not, the hybrid energy storage system is controlled to enter a forced charge and discharge state.

[0060] Specifically, the preset state of charge interval is the preset state of charge minimum value S OCmin and the preset maximum value of the state of charge S OCmax The interval composed of [S OCmin , S OCmax ]. OCmin and S OCmax The specific value of can be set according to actual needs. For example, S OCmin Can be set to 0.1, S OCmax It can be set to 0.9. At this time, combined with Figure 3 , for the state of charge S of the supercapacitor OCC And the state of charge S of the lithium battery OCL For example, if it satisfies or The hybrid energy storage system is controlled to enter a forced charging and discharging state.

[0061] Affected by the battery life and the safety of the hybrid energy storage system, when the state of charge of either the supercapacitor or the lithium battery is not within the specified range, that is, the preset state of charge interval [S OCmin , S OCmax ], the hybrid energy storage system enters the forced charge and discharge state. At this time, a preset power is required to force the battery to charge or discharge in order to restore its state of charge to the preset state of charge range. The preset power here is called the forced charge and discharge power. After the hybrid energy storage system enters the forced charge and discharge state, the batteries whose state of charge is not in the preset state of charge range are forced to charge and discharge, and the batteries whose state of charge is in the preset state of charge range operate in a normal working state.

[0062] In the following, the target power of the hybrid energy storage system is less than 0 (P R <0) as an example to introduce the output of the hybrid energy storage system under forced charging and discharging conditions.

[0063] Exemplarily, when the hybrid energy storage system is in a forced charge and discharge state, if the state of charge of the supercapacitor exceeds its corresponding maximum value and the lithium battery is in a corresponding preset state of charge range, the target power of the supercapacitor and the lithium battery is expressed as Formula 2:

[0064]

[0065] Among them, P C represents the target power of the supercapacitor, P L Indicates the target power of the lithium battery, PCF Represents the forced discharge power of the supercapacitor, P Lmax Indicates the maximum output power of the lithium battery.

[0066] Specifically, the state of charge S of the supercapacitor OCC Exceeds its corresponding maximum value S OCCmax , and the state of charge of the lithium battery is S OCL In the corresponding preset state of charge interval [S OCLmin , S OCLmax ], that is, S OCC >S OCCmax And S OCL ∈[S OCLmin , S OCLmax ], the supercapacitor is forced to discharge, and the lithium battery needs to absorb the energy of the supercapacitor's forced discharge while meeting the target power of the hybrid energy storage system. OCLmin Indicates the minimum state of charge of the lithium battery, S OCLmax Indicates the maximum state of charge of the lithium battery.

[0067] For example, combining Figure 3 , assuming that the preset state of charge interval is [0.1, 0.9], when the state of charge S of the supercapacitor OCC >0.9, the supercapacitor is forced to discharge, and its target power P C is the forced discharge power P Cf , so that the state of charge S OC Restore to the preset state of charge range [0.1, 0.9].

[0068] Exemplarily, when the hybrid energy storage system is in a forced charge and discharge state, if the state of charge of the lithium battery exceeds its corresponding maximum value, and the supercapacitor is in a corresponding preset state of charge range, the target power of the supercapacitor and the lithium battery is expressed as Formula 3:

[0069]

[0070] Among them, P C represents the target power of the supercapacitor, P L Indicates the target power of the lithium battery, P LF Indicates the forced discharge power of lithium battery, P Cmax Indicates the maximum output power of the supercapacitor.

[0071] Specifically, the state of charge S of the lithium battery OCL Exceeds its corresponding maximum value S OCLmax , and the state of charge of the supercapacitor is S OCC In the corresponding preset state of charge interval [S OCCmin , SOCCmax ], that is, S OCL >S OCLmax And S OCC ∈[S OCCmin , S OCCmax ], the lithium battery is forced to discharge, and the supercapacitor needs to absorb the energy of the lithium battery forced discharge while meeting the target power of the hybrid energy storage system. OCCmin Indicates the minimum state of charge of the supercapacitor, S OCCmax Indicates the maximum state of charge of the supercapacitor.

[0072] For example, combining Figure 3 , assuming that the preset state of charge interval is [0.1, 0.9], when the state of charge S of the lithium battery OCL >0.9, the lithium battery is forced to discharge, and its target power P L is the forced discharge power P Lf , so that the state of charge S OC Restore to the preset state of charge range [0.1, 0.9].

[0073] Exemplarily, when the hybrid energy storage system is in a forced charge and discharge state, if the state of charge of the supercapacitor exceeds its corresponding maximum value, and the state of charge of the lithium battery also exceeds its corresponding maximum value, then the target power of the supercapacitor and the target power of the lithium battery are both 0.

[0074] Specifically, the state of charge S of the lithium battery OCL Exceeds its corresponding maximum value S OCLmax , and the state of charge of the supercapacitor is S OCC Exceeds its corresponding maximum value S OCCmax , that is, S OCL >S OCLmax And S OCC >S OCCmax When the lithium battery and supercapacitor are forced to discharge at the same time, the hybrid energy storage system will be reversed, resulting in a decrease in AGC performance. Therefore, in this case, the target power of both the lithium battery and the supercapacitor should be 0, that is, P L = 0 and P C =0 until the target power changes in the opposite direction.

[0075] For example, combining Figure 3 , assuming that the preset state of charge interval is [0.1, 0.9], when the state of charge S of the supercapacitor OCC When <0.1, the supercapacitor is forced to charge, and its target power P C =-P Cf , so that the state of charge S OCRestore to the preset state of charge range [0.1, 0.9]. OCL When <0.1, the lithium battery is forced to charge, and its target power P L =-P Lf , so that the state of charge S OC Restore to the preset state of charge range [0.1, 0.9].

[0076] Since the supercapacitor and the lithium battery always respond to the target power at the same time, usually, there will not be a situation where one of the supercapacitor and the lithium battery is forced to charge and the other is forced to discharge.

[0077] Step S140: Based on the real-time operation data, it is determined whether the absolute value of the target power of the hybrid energy storage system is less than the power dead zone. If so, the hybrid energy storage system is controlled to enter a recovery charging and discharging state.

[0078] Specifically, the power dead zone is denoted as P 死区 , then combined with Figure 3 , satisfying |P R | <P 死区 When the hybrid energy storage system is restored to the charging and discharging state.

[0079] In order to avoid signal oscillation, a dead zone needs to be set for the action of the hybrid energy storage system, namely the action dead zone. When the absolute value of the target power of the hybrid energy storage system is less than the power dead zone corresponding to the action dead zone, the hybrid energy storage system does not respond. At the same time, in order to make the hybrid energy storage system in the best state, when the hybrid energy storage system is in the action dead zone and the deviation of its charge state from the set value (generally the initial value S0) is greater than another dead zone such as |S OC -S0|>5%, another preset power is needed to charge or discharge the battery to keep the state of charge close to the set value S0. The preset power here is called the recovery charge and discharge power, S OC is the charge state of the hybrid energy storage system.

[0080] Exemplarily, when the target power of the hybrid energy storage system is in the power dead zone, the target power of the lithium battery is expressed as Formula 4, and the target power of the supercapacitor is expressed as Formula 5:

[0081]

[0082] Among them, P L Indicates the target power of the lithium battery, P LS Indicates the recovery discharge power of lithium battery, S OCL Indicates the state of charge of the lithium battery, and S0 indicates the initial value of the state of charge.

[0083]

[0084] Among them, P C represents the target power of the supercapacitor, P CS Represents the recovery discharge power of the supercapacitor, S OCC Indicates the state of charge of the supercapacitor.

[0085] Specifically, considering that the state of charge of the hybrid energy storage system has the same charging and discharging capabilities when the state of charge is at an intermediate value of 0.5, and can better adapt to the complex and changing AGC instructions, the initial value of the state of charge S0 can be 0.5.

[0086] For example, combining Figure 3 , if P R >0 and S OCC -S0>0.05, the supercapacitor resumes discharge, and its target power P C =P CS If P R >0 and S OCL -S0>0.05, the lithium battery resumes discharge, and its target power P L =P LS If P R <0 and S OCC -S0<-0.05, the supercapacitor resumes charging, and its target power P C =-P CS If P R <0 and S OCL -S0<-0.05, the lithium battery resumes charging, and its target power P L =-P LS .

[0087] Step S150, based on the real-time operation data, determine whether normal charging and discharging conditions are met, and if so, control the hybrid energy storage system to enter a normal charging and discharging state.

[0088] Specifically, if the battery state of charge meets normal charging and discharging conditions, and the absolute value of the target power of the hybrid energy storage system at time t |P R (t)| is greater than the dead zone range, the hybrid energy storage system enters the normal charging and discharging state.

[0089] In order to reduce the loss of lithium battery life and make full use of the long cycle life of supercapacitors, when the hybrid energy storage system is in a normal charging and discharging state, the supercapacitors are used to give priority to output and the lithium batteries are used to supplement the output to assist the unit in frequency regulation. Figure 3 When the hybrid energy storage system is in a normal charging and discharging state, the discharge condition is expressed as formula 6, and the charging condition is expressed as formula 7:

[0090]

[0091]

[0092] Among them, P C Represents the target power of the supercapacitor. L Indicates the target power of the lithium battery. Cmax Indicates the maximum output power of the supercapacitor. Lmax Indicates the maximum output power of the lithium battery. R (t) represents the target power of the hybrid energy storage system at time t, P R (t)<0 means the target power P of the hybrid energy storage system at time t R <0.

[0093] The hybrid energy storage system control method provided in the embodiment of the present disclosure improves the overall energy utilization efficiency of the hybrid energy storage system compared to the prior art; reduces the number of cycles of the lithium battery and extends its service life; enhances the secondary frequency regulation capability of the wind farm and stabilizes the grid frequency by optimizing the control strategy; and combines the advantages of the high power density of supercapacitors and the high energy density of lithium batteries to improve the response speed and regulation capability of the system.

[0094] Another embodiment of the present disclosure relates to a hybrid energy storage system control device, such as Figure 4 As shown, it includes an acquisition module 410 , a calculation module 420 , a first control module 430 , a second control module 440 , and a third control module 450 .

[0095] The acquisition module 410 is used to acquire real-time operation data of the wind turbine and the hybrid energy storage system.

[0096] The calculation module 420 is used to calculate the target power of the hybrid energy storage system based on real-time operation data.

[0097] The first control module 430 is used to determine whether the supercapacitor and the lithium battery are both in the corresponding preset state of charge range based on the real-time operation data. If not, the hybrid energy storage system is controlled to enter a forced charge and discharge state.

[0098] The second control module 440 is used to determine whether the absolute value of the target power of the hybrid energy storage system is less than the power dead zone based on the real-time operation data, and if so, control the hybrid energy storage system to enter the recovery charging and discharging state.

[0099] The third control module 450 is used to determine whether normal charging and discharging conditions are met based on real-time operating data, and if so, control the hybrid energy storage system to enter a normal charging and discharging state.

[0100] The specific implementation method of the hybrid energy storage system control device provided in the embodiment of the present disclosure can refer to the hybrid energy storage system control method provided in the embodiment of the present disclosure, which will not be repeated here.

[0101] The hybrid energy storage system control device provided in the embodiment of the present disclosure improves the overall energy utilization efficiency of the hybrid energy storage system compared to the prior art; reduces the number of cycles of the lithium battery and extends its service life; enhances the secondary frequency regulation capability of the wind farm and stabilizes the grid frequency by optimizing the control strategy; and combines the advantages of the high power density of supercapacitors and the high energy density of lithium batteries to improve the response speed and regulation capability of the system.

[0102] Another embodiment of the present disclosure relates to an electronic device, such as Figure 5 As shown, including:

[0103] at least one processor 501; and,

[0104] A memory 502 is communicatively connected to at least one processor 501; wherein,

[0105] The memory 502 stores instructions that can be executed by at least one processor 501 . The instructions are executed by at least one processor 501 so that the at least one processor 501 can execute the hybrid energy storage system control method described in the above embodiment.

[0106] Among them, the memory and the processor are connected in a bus manner, and the bus may include any number of interconnected buses and bridges, and the bus connects various circuits of one or more processors and memories together. The bus can also connect various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface between the bus and the transceiver. The transceiver can be one element or multiple elements, such as multiple receivers and transmitters, providing a unit for communicating with various other devices on a transmission medium. The data processed by the processor is transmitted on a wireless medium via an antenna, and further, the antenna also receives data and transmits the data to the processor.

[0107] The processor is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interfaces, voltage regulation, power management, and other control functions. Memory can be used to store data used by the processor when performing operations.

[0108] Another embodiment of the present disclosure relates to a computer-readable storage medium storing a computer program, which implements the hybrid energy storage system control method described in the above embodiment when executed by a processor.

[0109] That is, those skilled in the art can understand that all or part of the steps in the method described in the above embodiments can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including several instructions for making a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) perform all or part of the steps of the method described in each embodiment of the present disclosure. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program codes.

[0110] Those skilled in the art will appreciate that the above-mentioned embodiments are specific embodiments for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present disclosure.

Claims

1. A hybrid energy storage system control method, characterized in that: The control method comprises: Obtain real-time operating data of wind turbines and hybrid energy storage systems; Calculating the target power of the hybrid energy storage system based on the real-time operation data; Based on the real-time operation data, determining whether the supercapacitor and the lithium battery are both in the corresponding preset state of charge intervals, and if not, controlling the hybrid energy storage system to enter a forced charge and discharge state; Based on the real-time operation data, determining whether the absolute value of the target power of the hybrid energy storage system is less than the power dead zone, and if so, controlling the hybrid energy storage system to enter a recovery charging and discharging state; Based on the real-time operation data, it is determined whether normal charging and discharging conditions are met. If so, the hybrid energy storage system is controlled to enter a normal charging and discharging state.

2. The control method according to claim 1, characterized in that: The calculating the target power of the hybrid energy storage system based on the real-time operation data includes: According to Formula 1, the target power of the hybrid energy storage system is calculated: P R =P A -P F Formula 1; Among them, P R represents the target power of the hybrid energy storage system, P A Indicates the power indicated by the automatic power generation control command, P F Indicates the power of wind turbine.

3. The control method according to claim 2, characterized in that: When the hybrid energy storage system is in the forced charge and discharge state, if the state of charge of the supercapacitor exceeds its corresponding maximum value, and the lithium battery is in the corresponding preset state of charge interval, the target power of the supercapacitor and the lithium battery is expressed as Formula 2: Among them, P C represents the target power of the supercapacitor, P L represents the target power of the lithium battery, P CF represents the forced discharge power of the supercapacitor, P Lmax Indicates the maximum output power of the lithium battery.

4. The control method according to claim 2, characterized in that: When the hybrid energy storage system is in the forced charge and discharge state, if the state of charge of the lithium battery exceeds its corresponding maximum value, and the supercapacitor is in the corresponding preset state of charge interval, the target power of the supercapacitor and the lithium battery is expressed as Formula 3: Among them, P C represents the target power of the supercapacitor, P L represents the target power of the lithium battery, P LF Indicates the forced discharge power of the lithium battery, P Cmax represents the maximum output power of the supercapacitor.

5. The control method according to claim 2, characterized in that: When the hybrid energy storage system is in the forced charge and discharge state, if the state of charge of the supercapacitor exceeds its corresponding maximum value, and the state of charge of the lithium battery also exceeds its corresponding maximum value, the target power of the supercapacitor and the target power of the lithium battery are both 0.

6. The control method according to claim 1, characterized in that: When the target power of the hybrid energy storage system is in the power dead zone, the target power of the lithium battery is expressed as Formula 4, and the target power of the supercapacitor is expressed as Formula 5: Among them, P L represents the target power of the lithium battery, P LS Represents the recovery discharge power of the lithium battery, S OCL represents the state of charge of the lithium battery, S0 represents the initial value of the state of charge; Among them, P C represents the target power of the supercapacitor, P CS represents the recovery discharge power of the supercapacitor, S OCC Indicates the state of charge of the supercapacitor.

7. The control method according to claim 2, characterized in that: When the hybrid energy storage system is in a normal charging and discharging state, the discharging condition is expressed as Formula 6, and the charging condition is expressed as Formula 7: Among them, P C represents the target power of the supercapacitor, P L represents the target power of the lithium battery, P Cmax represents the maximum output power of the supercapacitor, P Lmax Indicates the maximum output power of the lithium battery, P R (t) represents the target power of the hybrid energy storage system at time t.

8. A hybrid energy storage system control device, characterized in that: The control device comprises: An acquisition module is used to obtain real-time operating data of wind turbines and hybrid energy storage systems; A calculation module, used for calculating the target power of the hybrid energy storage system based on the real-time operation data; A first control module, configured to determine, based on the real-time operation data, whether the supercapacitor and the lithium battery are both in a corresponding preset state of charge interval, and if not, control the hybrid energy storage system to enter a forced charge and discharge state; A second control module is used to determine whether the absolute value of the target power of the hybrid energy storage system is less than the power dead zone based on the real-time operation data, and if so, control the hybrid energy storage system to enter a recovery charging and discharging state; The third control module is used to determine whether normal charging and discharging conditions are met based on the real-time operation data, and if so, control the hybrid energy storage system to enter a normal charging and discharging state.

9. An electronic device, characterized in that: include: at least one processor; as well as, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the hybrid energy storage system control method according to any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the hybrid energy storage system control method according to any one of claims 1 to 7 is implemented.

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