Frequency regulation method and device for thermal power generation units based on flywheel lithium battery hybrid energy storage system

Abstract

The present application proposes a frequency regulation method and device for a thermal power unit based on a flywheel-lithium battery hybrid energy storage system, wherein the flywheel-lithium battery hybrid energy storage system includes a flywheel energy storage unit and a lithium battery energy storage unit. The method includes: receiving an automatic generation control AGC instruction sent by a remote terminal unit (RTU); filtering the AGC instruction based on a preset sampling frequency and time window width to obtain a high-frequency response power instruction and a low-frequency response power instruction; judging whether the flywheel energy storage unit and the lithium battery energy storage unit have power adjustment space in corresponding directions based on the AGC instruction; in response to the flywheel energy storage unit having power adjustment space in corresponding directions and the lithium battery energy storage unit having power adjustment space in corresponding directions, controlling the output of the flywheel energy storage unit based on the high-frequency response power instruction and controlling the output of the lithium battery energy storage unit based on the low-frequency response power instruction according to the maximum output demand and the maximum power adjustment space of the flywheel energy storage unit and the lithium battery energy storage unit.

Description

Technical Field

[0001] The present application relates to the technical field of thermal power frequency regulation, and in particular to a method and device for frequency regulation of a thermal power unit based on a flywheel lithium battery hybrid energy storage system. Background Art

[0002] To address energy shortages and climate change, the industry is comprehensively promoting energy system reforms and vigorously developing renewable energy. The large-scale integration of renewable energy into the grid has also led to fluctuations in power system frequency, resulting in a decline in power supply quality and impacting industrial production and social life. Currently, thermal power generation, as the primary source of power generation, also plays a significant role in power frequency regulation. However, frequent frequency regulation can exacerbate equipment wear, increase fuel use, and waste emissions, leading to significant fluctuations in steam pressure, reducing the safety and economic efficiency of thermal power plants. New technologies are urgently needed to improve power frequency regulation. Summary of the Invention

[0003] The present application aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, the first embodiment of the present application proposes a method for frequency regulation of a thermal power unit based on a flywheel lithium battery hybrid energy storage system, wherein the flywheel lithium battery hybrid energy storage system includes a flywheel energy storage unit and a lithium battery energy storage unit, and the method includes:

[0005] Receive automatic generation control AGC instructions sent by the remote terminal unit RTU;

[0006] Filtering the AGC command based on a preset sampling frequency and a time window width to obtain a high-frequency response power command and a low-frequency response power command;

[0007] Determining whether the flywheel energy storage unit and the lithium battery energy storage unit have power adjustment space in corresponding directions based on the AGC instruction;

[0008] In response to the fact that the flywheel energy storage unit has a power adjustment space in a corresponding direction, and the lithium battery energy storage unit has a power adjustment space in a corresponding direction, according to the maximum output demand and the maximum power adjustment space of the flywheel energy storage unit and the lithium battery energy storage unit, the output of the flywheel energy storage unit is controlled based on the high-frequency response power instruction, and the output of the lithium battery energy storage unit is controlled based on the low-frequency response power instruction.

[0009] In some embodiments of the present application, the filtering process of the AGC instruction based on the preset sampling frequency and time window width to obtain the high frequency response power instruction and the low frequency response power instruction includes: based on the sampling frequency F tThe AGC instruction is sampled with the time window width T to obtain multiple AGC instruction samples; a low-frequency response power instruction is obtained according to the multiple AGC instruction samples and a preset low-frequency response power instruction calculation formula; a high-frequency response power instruction is obtained according to the AGC instruction and the low-frequency response power instruction.

[0010] In some embodiments of the present application, the low-frequency response power instruction calculation formula is expressed as follows:

[0011]

[0012] Wherein, P(t) is the AGC instruction sample at time t, P L (t) is the low frequency response power instruction at time t, P H (t) is the high-frequency response power instruction at time t, N is the number of AGC instruction samples in the cache, P(t-1) is the AGC instruction sample at time t-1, and P(tN) is the AGC instruction sample at time tN.

[0013] In some embodiments of the present application, before filtering the AGC instruction based on the preset sampling frequency and time window width, the method further includes: determining whether the depth of the AGC instruction is greater than or equal to the flywheel energy storage capacity; in response to the depth of the AGC instruction being greater than or equal to the flywheel energy storage capacity, executing the step of filtering the AGC instruction based on the preset sampling frequency and time window width.

[0014] In some embodiments of the present application, the method further includes: in response to the depth of the AGC instruction being less than the flywheel energy storage capacity, determining whether the flywheel energy storage unit has power adjustment space in the corresponding direction; in response to the flywheel energy storage unit having power adjustment space in the corresponding direction, controlling the output of the flywheel energy storage unit according to the maximum output demand and the maximum power adjustment space of the flywheel energy storage unit; or, in response to the flywheel energy storage unit not having power adjustment space in the corresponding direction, determining whether the lithium battery energy storage unit has power adjustment space in the corresponding direction; in response to the lithium battery energy storage unit having power adjustment space in the corresponding direction, controlling the output of the lithium battery energy storage unit according to the maximum output demand and the maximum power adjustment space of the lithium battery energy storage unit; or, in response to the lithium battery energy storage unit not having power adjustment space in the corresponding direction, sending the AGC instruction to the thermal power unit to control the output of the thermal power unit.

[0015] In some embodiments of the present application, the method further includes: in response to the flywheel energy storage unit not having power adjustment space in the corresponding direction, and the lithium battery energy storage unit having power adjustment space in the corresponding direction, controlling the output of the lithium battery energy storage unit according to the maximum output demand and the maximum power adjustment space of the lithium battery energy storage unit; or, in response to the flywheel energy storage unit not having power adjustment space in the corresponding direction, and the lithium battery energy storage unit not having power adjustment space in the corresponding direction, sending the AGC instruction to the thermal power unit to control the output of the thermal power unit.

[0016] A second embodiment of the present application provides a frequency regulation device for a thermal power unit based on a flywheel-lithium battery hybrid energy storage system, wherein the flywheel-lithium battery hybrid energy storage system includes a flywheel energy storage unit and a lithium battery energy storage unit, and the device includes:

[0017] A receiving module, used for receiving an automatic generation control AGC instruction sent by a remote terminal unit RTU;

[0018] A filtering module, configured to filter the AGC instruction based on a preset sampling frequency and a time window width to obtain a high-frequency response power instruction and a low-frequency response power instruction;

[0019] A control module is configured to respond to the flywheel energy storage unit having a power adjustment space in a corresponding direction and the lithium battery energy storage unit having a power adjustment space in a corresponding direction, control the output of the flywheel energy storage unit based on the high-frequency response power instruction and control the output of the lithium battery energy storage unit based on the low-frequency response power instruction according to the maximum output demand and the maximum power adjustment space of the flywheel energy storage unit and the lithium battery energy storage unit.

[0020] In some embodiments of the present application, the filtering module is specifically configured to: based on the sampling frequency F t The AGC instruction is sampled with the time window width T to obtain multiple AGC instruction samples; a low-frequency response power instruction is obtained according to the multiple AGC instruction samples and a preset low-frequency response power instruction calculation formula; a high-frequency response power instruction is obtained according to the AGC instruction and the low-frequency response power instruction.

[0021] The third embodiment of the present application proposes a thermal power unit frequency regulation system, comprising: a remote terminal unit (RTU), a thermal power unit, and a flywheel lithium battery hybrid energy storage system, wherein:

[0022] The remote terminal unit RTU is connected to the thermal power unit and the flywheel lithium battery hybrid energy storage system respectively;

[0023] The flywheel lithium battery hybrid energy storage system includes a flywheel energy storage unit, a lithium battery energy storage unit and an energy storage control unit, wherein the flywheel energy storage unit and the lithium battery energy storage unit are connected in parallel on the A / B section busbar through an energy storage box transformer, and the busbar is connected to the low-voltage side of the high-voltage plant transformer of the thermal power plant through a grid-connected switch and an incoming line switch, and the high-voltage side of the high-voltage plant transformer of the thermal power plant is connected to the thermal power unit;

[0024] Wherein, the energy storage control unit executes the aforementioned thermal power unit frequency regulation method based on the flywheel lithium battery hybrid energy storage system.

[0025] The fourth aspect embodiment of the present application proposes a non-temporary computer-readable storage medium on which a computer program is stored, characterized in that when the program is executed by a processor, the aforementioned thermal power unit frequency regulation method based on a flywheel lithium battery hybrid energy storage system is implemented.

[0026] According to the frequency regulation method of a thermal power unit based on a flywheel lithium battery hybrid energy storage system according to the embodiment of the present application, the AGC instructions are collected and filtered to obtain high-frequency response power instructions and low-frequency response power instructions. The high-frequency response power instructions are responded to by the flywheel energy storage unit, and the low-frequency response power instructions are responded to by the lithium battery energy storage unit. The present application can accurately filter the AGC instructions, obtain high-frequency response power instructions and low-frequency response power instructions, and control the flywheel energy storage unit and the lithium battery energy storage unit to work together. It can not only give play to the advantages of flywheel energy storage such as fast response speed, high specific power, fast charging and discharging, but also give play to the advantages of lithium battery energy storage such as high energy density and suitability for long-term charging and discharging, steadily improve the performance indicators of the AGC combined frequency regulation of the thermal power unit, extend the life of the energy storage battery, and thus improve the economic benefits.

[0027] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0029] Figure 1 A schematic diagram of a frequency regulation system for a thermal power plant provided in an embodiment of the present application;

[0030] Figure 2 A schematic diagram of a flywheel lithium battery hybrid energy storage system provided in an embodiment of the present application;

[0031] Figure 3 A flow chart of a method for frequency regulation of a thermal power unit based on a flywheel lithium battery hybrid energy storage system provided in an embodiment of the present application;

[0032] Figure 4 A flow chart of another method for frequency regulation of a thermal power unit based on a flywheel lithium battery hybrid energy storage system provided in an embodiment of the present application;

[0033] Figure 5 This is a schematic diagram of a frequency regulation device for a thermal power unit based on a flywheel lithium battery hybrid energy storage system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0035] The following describes a method and device for frequency regulation of a thermal power unit based on a flywheel lithium battery hybrid energy storage system according to an embodiment of the present application with reference to the accompanying drawings.

[0036] In order to better understand the method for frequency regulation of a thermal power unit based on a flywheel lithium battery hybrid energy storage system disclosed in the embodiment of the present application, the thermal power unit frequency regulation system applicable to the embodiment of the present application is first described below. The embodiment of the present application provides a thermal power unit frequency regulation system including: a remote terminal unit RTU, a thermal power unit and a flywheel lithium battery hybrid energy storage system. Figure 1 As shown, the remote terminal unit RTU is connected to the thermal power unit and the flywheel lithium battery hybrid energy storage system respectively.

[0037] It should be noted that the RTU will collect energy storage output signals and unit output signals, and at the same time distribute AGC command signals to the distributed control system DCS and the flywheel lithium battery hybrid energy storage system.

[0038] like Figure 2 As shown, the flywheel lithium battery hybrid energy storage system includes a flywheel energy storage unit, a lithium battery energy storage unit, and an energy storage control unit. The flywheel energy storage unit and the lithium battery energy storage unit are controlled by the energy storage control unit. The flywheel energy storage unit and the lithium battery energy storage unit are connected in parallel on the A / B section busbar through the energy storage box transformer. The busbar is connected to the low-voltage side of the high-voltage plant transformer of the thermal power plant through the grid-connected switch and the incoming line switch. The high-voltage side of the high-voltage plant transformer of the thermal power plant is connected to the thermal power unit. It should be noted that the energy storage control unit and the thermal power unit on the high-voltage side of the high-voltage plant transformer of the thermal power plant are not shown in the figure.

[0039] Among them, the energy storage control unit executes any one of the thermal power unit frequency regulation methods based on the flywheel lithium battery hybrid energy storage system proposed in the embodiments of the present application.

[0040] Figure 3This is a flow chart of a method for frequency regulation of a thermal power unit based on a flywheel lithium battery hybrid energy storage system provided in an embodiment of the present application. Figure 3 As shown, the frequency regulation method of a thermal power unit based on a flywheel lithium battery hybrid energy storage system provided in the embodiment of the present application includes the following steps:

[0041] Step 301: Receive an automatic generation control (AGC) instruction sent by a remote terminal unit (RTU).

[0042] Optionally, the RTU collects energy storage output signals and unit output signals, and distributes AGC command signals to the distributed control system (DCS) and the flywheel lithium battery hybrid energy storage system. The energy storage control unit can receive AGC commands sent by the RTU.

[0043] Step 302 : Filter the AGC command based on a preset sampling frequency and time window width to obtain a high-frequency response power command and a low-frequency response power command.

[0044] In some embodiments of the present application, the AGC command can be sampled through a preset time window, and the high-frequency response power command and the low-frequency response power command can be obtained based on the collected AGC command samples. As a possible implementation method, the sampling frequency F t With the time window width T, the AGC command is sampled to obtain N AGC command samples (N = F t *T). According to the N AGC command samples, a low-frequency response power command is obtained according to a preset low-frequency response power command calculation formula. According to the AGC command and the low-frequency response power command, a high-frequency response power command is obtained.

[0045] As an example, the low-frequency response power command calculation formula is expressed as follows:

[0046]

[0047] Among them, P(t) is the AGC instruction sample at time t, P L (t) is the low-frequency response power command at time t, P H (t) is the high frequency response power instruction at time t, and N is the number of AGC instruction samples in the cache (N = F t *T), P(t-1) is the AGC command sample at time t-1, and P(tN) is the AGC command sample at time tN.

[0048] Then, the high-frequency response power command P is calculated based on the difference between the AGC command and the low-frequency response power command. H (t). Please refer to the following formula:

[0049] P H (t) = P(t) - PL (t)

[0050] Step 303: Based on the AGC instruction, it is determined whether the flywheel energy storage unit and the lithium battery energy storage unit have power adjustment space in corresponding directions.

[0051] In some embodiments of the present application, it is possible to determine whether the flywheel energy storage unit and the lithium battery energy storage unit have power adjustment space in the corresponding direction based on the AGC instruction and the capacity of the flywheel energy storage unit and the lithium battery energy storage unit. It should be noted that the corresponding direction refers to whether the AGC instruction requires the load to be increased or decreased.

[0052] Step 304: In response to the flywheel energy storage unit having power adjustment space in the corresponding direction and the lithium battery energy storage unit having power adjustment space in the corresponding direction, the flywheel energy storage unit output is controlled based on the high-frequency response power instruction and the lithium battery energy storage unit output is controlled based on the low-frequency response power instruction according to the maximum output demand and the maximum power adjustment space of the flywheel energy storage unit and the lithium battery energy storage unit.

[0053] It should be noted that the maximum output demand is the AGC command. That is, when both the flywheel energy storage unit and the lithium battery energy storage unit have power adjustment space in corresponding directions, the flywheel energy storage unit responds to high-frequency power commands, while the lithium battery energy storage unit responds to low-frequency power commands. The flywheel-lithium battery hybrid energy storage system output is set based on the maximum output demand and the maximum power adjustment space of the flywheel and lithium battery units, thereby helping the thermal power unit load follow the AGC command.

[0054] According to the frequency regulation method of a thermal power unit based on a flywheel lithium battery hybrid energy storage system according to the embodiment of the present application, the AGC instructions are collected and filtered to obtain high-frequency response power instructions and low-frequency response power instructions. The high-frequency response power instructions are responded to by the flywheel energy storage unit, and the low-frequency response power instructions are responded to by the lithium battery energy storage unit. The present application can accurately filter the AGC instructions, obtain high-frequency response power instructions and low-frequency response power instructions, and control the flywheel energy storage unit and the lithium battery energy storage unit to work together. It can not only give play to the advantages of flywheel energy storage such as fast response speed, high specific power, fast charging and discharging, but also give play to the advantages of lithium battery energy storage such as high energy density and suitability for long-term charging and discharging, steadily improve the performance indicators of the AGC combined frequency regulation of the thermal power unit, extend the life of the energy storage battery, and thus improve the economic benefits.

[0055] Figure 4 This is a flow chart of another method for frequency regulation of a thermal power unit based on a flywheel lithium battery hybrid energy storage system provided in an embodiment of the present application. Figure 4 As shown, the frequency regulation method of a thermal power unit based on a flywheel lithium battery hybrid energy storage system provided in the embodiment of the present application includes the following steps:

[0056] Step 401: Receive an automatic generation control (AGC) instruction sent by a remote terminal unit (RTU).

[0057] Step 402: Determine whether the depth of the AGC instruction is greater than or equal to the flywheel energy storage capacity. If the depth of the AGC instruction is greater than or equal to the flywheel energy storage capacity, execute step 403; if the depth of the AGC instruction is less than the flywheel energy storage capacity, execute step 408.

[0058] Step 403 : Filter the AGC instruction based on a preset sampling frequency and a time window width to obtain a high-frequency response power instruction and a low-frequency response power instruction.

[0059] Step 404: Based on the AGC instruction, determine whether the flywheel energy storage unit and the lithium battery energy storage unit have power adjustment space in the corresponding direction. If the flywheel energy storage unit has power adjustment space in the corresponding direction, and the lithium battery energy storage unit has power adjustment space in the corresponding direction, then execute step 405; if the flywheel energy storage unit does not have power adjustment space in the corresponding direction, and the lithium battery energy storage unit does have power adjustment space in the corresponding direction, then execute step 406; if the flywheel energy storage unit does not have power adjustment space in the corresponding direction, and the lithium battery energy storage unit does not have power adjustment space in the corresponding direction, then execute step 407.

[0060] Step 405 , according to the maximum output demand and the maximum power adjustment space of the flywheel energy storage unit and the lithium battery energy storage unit, the output of the flywheel energy storage unit is controlled based on the high-frequency response power instruction, and the output of the lithium battery energy storage unit is controlled based on the low-frequency response power instruction.

[0061] Step 406: Control the output of the lithium battery energy storage unit according to the maximum output demand and the maximum power adjustment space of the lithium battery energy storage unit.

[0062] Step 407: Send the AGC instruction to the thermal power unit to control the output of the thermal power unit.

[0063] Step 408: Determine whether the flywheel energy storage unit has power adjustment space in the corresponding direction. If the flywheel energy storage unit has power adjustment space in the corresponding direction, execute step 409; if the flywheel energy storage unit does not have power adjustment space in the corresponding direction, execute step 410.

[0064] Step 409 : Control the output of the flywheel energy storage unit according to the maximum output requirement and the maximum power adjustment space of the flywheel energy storage unit.

[0065] It should be noted that when the depth of the AGC instruction is less than the flywheel energy storage capacity, the flywheel energy storage priority regulation mode is entered. That is, the flywheel energy storage unit is first determined to have power adjustment space in the corresponding direction. If so, the flywheel energy storage unit output is controlled. If the flywheel energy storage unit does not have power adjustment space in the corresponding direction, the lithium battery energy storage unit is then determined to have power adjustment space in the corresponding direction. If so, the lithium battery energy storage unit output is controlled. If the lithium battery energy storage unit does not have power adjustment space in the corresponding direction, the thermal power unit adjusts the output.

[0066] Step 410: Determine whether the lithium battery energy storage unit has power adjustment space in the corresponding direction. If the lithium battery energy storage unit has power adjustment space in the corresponding direction, execute step 411; if the lithium battery energy storage unit does not have power adjustment space in the corresponding direction, execute step 412.

[0067] Step 411 : Control the output of the lithium battery energy storage unit according to the maximum output demand and the maximum power adjustment space of the lithium battery energy storage unit.

[0068] Step 412: Send the AGC instruction to the thermal power generation unit to control the output of the thermal power generation unit.

[0069] Among them, step 401 and step 403-step 405 can be implemented respectively using any method in the various embodiments of the present application. This application does not make any specific limitations on this and will not elaborate on it.

[0070] According to the frequency regulation method for a thermal power unit based on a flywheel-lithium battery hybrid energy storage system according to an embodiment of the present application, when the depth of the AGC instruction is less than the flywheel energy storage capacity, the flywheel energy storage priority regulation mode is entered. When the depth of the AGC instruction is greater than or equal to the flywheel energy storage capacity, it is determined whether the flywheel energy storage unit and the lithium battery energy storage unit have power regulation space in the corresponding direction. When the flywheel energy storage unit and the lithium battery energy storage unit have power regulation space in the corresponding direction, the AGC instruction is filtered to obtain a high-frequency response power instruction and a low-frequency response power instruction. The high-frequency response power instruction is responded to by the flywheel energy storage unit, and the low-frequency response power instruction is responded to by the lithium battery energy storage unit. This application can accurately filter AGC instructions, obtain high-frequency response power instructions and low-frequency response power instructions, and control the flywheel energy storage unit and the lithium battery energy storage unit to work together. It can not only give full play to the advantages of flywheel energy storage such as fast response speed, high specific power, fast charging and discharging, but also give full play to the advantages of lithium battery energy storage such as high energy density and suitability for long-term charging and discharging, further steadily improve the AGC joint frequency regulation performance indicators of thermal power units, extend the life of energy storage batteries, and thus improve economic benefits.

[0071] Figure 5This is a schematic diagram of a thermal power unit frequency regulation device based on a flywheel lithium battery hybrid energy storage system provided in an embodiment of the present application. Figure 5 As shown, the frequency regulation device of a thermal power unit based on a flywheel lithium battery hybrid energy storage system provided in the embodiment of the present application includes: a receiving module 501, a filtering module 502 and a control module 503.

[0072] The receiving module 501 is configured to receive an automatic generation control AGC instruction sent by a remote terminal unit RTU.

[0073] The filtering module 502 is configured to filter the AGC instruction based on a preset sampling frequency and a time window width to obtain a high-frequency response power instruction and a low-frequency response power instruction.

[0074] Control module 503 is used to respond to the flywheel energy storage unit having power adjustment space in the corresponding direction and the lithium battery energy storage unit having power adjustment space in the corresponding direction, and to control the output of the flywheel energy storage unit based on the high-frequency response power instruction and the output of the lithium battery energy storage unit based on the low-frequency response power instruction in accordance with the maximum output demand and the maximum power adjustment space of the flywheel energy storage unit and the lithium battery energy storage unit.

[0075] In some embodiments of the present application, the filtering module 502 is specifically configured to: t The AGC instruction is sampled with the time window width T to obtain multiple AGC instruction samples; based on the multiple AGC instruction samples, a low-frequency response power instruction is obtained according to a preset low-frequency response power instruction calculation formula; based on the AGC instruction and the low-frequency response power instruction, a high-frequency response power instruction is obtained.

[0076] Regarding the apparatus in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0077] According to the thermal power unit frequency regulation device based on the flywheel lithium battery hybrid energy storage system of the embodiment of the present application, the AGC instructions are collected and filtered to obtain high-frequency response power instructions and low-frequency response power instructions. The high-frequency response power instructions are responded by the flywheel energy storage unit, and the low-frequency response power instructions are responded by the lithium battery energy storage unit. The present application can accurately filter the AGC instructions, obtain high-frequency response power instructions and low-frequency response power instructions, and control the flywheel energy storage unit and the lithium battery energy storage unit to work together. It can not only give play to the advantages of flywheel energy storage such as fast response speed, high specific power, fast charging and discharging, but also give play to the advantages of lithium battery energy storage such as high energy density and suitability for long-term charging and discharging, steadily improve the performance indicators of thermal power unit AGC joint frequency regulation, extend the life of energy storage batteries, and thus improve economic benefits.

[0078] In order to implement the above embodiments, the present application also proposes a non-temporary computer-readable storage medium. When the instructions in the storage medium are executed by the processor of an electronic device, the electronic device is able to execute the aforementioned thermal power unit frequency regulation method based on the flywheel lithium battery hybrid energy storage system.

[0079] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0080] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0081] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic devices), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and a portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0082] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0083] Those skilled in the art will understand that all or part of the steps in the method of the above embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0084] In addition, the functional units in the various embodiments of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into a module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0085] The storage medium mentioned above may be a read-only memory, a magnetic disk, or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application. Persons skilled in the art may make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A frequency modulation method for a thermal power unit based on a flywheel lithium battery hybrid energy storage system, characterized in that: The flywheel lithium battery hybrid energy storage system includes a flywheel energy storage unit and a lithium battery energy storage unit, and the method includes the following steps: Receive automatic generation control AGC instructions sent by the remote terminal unit RTU; Filtering the AGC command based on a preset sampling frequency and a time window width to obtain a high-frequency response power command and a low-frequency response power command; Determining whether the flywheel energy storage unit and the lithium battery energy storage unit have power adjustment space in corresponding directions based on the AGC instruction; In response to the flywheel energy storage unit having a power adjustment space in a corresponding direction and the lithium battery energy storage unit having a power adjustment space in a corresponding direction, according to the maximum output demand and the maximum power adjustment spaces of the flywheel energy storage unit and the lithium battery energy storage unit, the output of the flywheel energy storage unit is controlled based on the high-frequency response power instruction, and the output of the lithium battery energy storage unit is controlled based on the low-frequency response power instruction; The filtering process on the AGC instruction based on the preset sampling frequency and time window width to obtain a high-frequency response power instruction and a low-frequency response power instruction includes: Based on the sampling frequency F t and the time window width T, sampling the AGC command to obtain a plurality of AGC command samples; Obtaining a low-frequency response power instruction according to a preset low-frequency response power instruction calculation formula based on the multiple AGC instruction samples; Obtaining a high-frequency response power instruction according to the AGC instruction and the low-frequency response power instruction; The low frequency response power command calculation formula is as follows: The high-frequency response power command calculation formula is as follows: in, is the AGC instruction sample at time t, is the low-frequency response power command at time t, is the high-frequency response power instruction at time t, is the number of AGC instruction samples in the cache, is the AGC instruction sample at time t-1, is the AGC instruction sample at time tN.

2. The method according to claim 1, wherein Before filtering the AGC instruction based on the preset sampling frequency and time window width, the method further includes: Determining whether the depth of the AGC instruction is greater than or equal to the flywheel energy storage capacity; In response to the depth of the AGC instruction being greater than or equal to the flywheel energy storage capacity, the step of filtering the AGC instruction based on a preset sampling frequency and a time window width is performed.

3. The method according to claim 2, wherein Also includes: In response to the depth of the AGC instruction being less than the flywheel energy storage capacity, determining whether the flywheel energy storage unit has power adjustment space in a corresponding direction; In response to the flywheel energy storage unit having a power adjustment space in a corresponding direction, the output of the flywheel energy storage unit is controlled according to the maximum output demand and the maximum power adjustment space of the flywheel energy storage unit; or In response to the flywheel energy storage unit not having power adjustment space in the corresponding direction, determining whether the lithium battery energy storage unit has power adjustment space in the corresponding direction; In response to the lithium battery energy storage unit having a power adjustment space in a corresponding direction, the output of the lithium battery energy storage unit is controlled according to the maximum output demand and the maximum power adjustment space of the lithium battery energy storage unit; or, In response to the lithium battery energy storage unit not having power adjustment space in a corresponding direction, the AGC instruction is sent to the thermal power group to control the output of the thermal power group.

4. The method according to claim 1, wherein Also includes: In response to the flywheel energy storage unit not having power adjustment space in the corresponding direction, and the lithium battery energy storage unit having power adjustment space in the corresponding direction, controlling the output of the lithium battery energy storage unit according to the maximum output demand and the maximum power adjustment space of the lithium battery energy storage unit; or In response to the fact that the flywheel energy storage unit does not have power adjustment space in the corresponding direction and the lithium battery energy storage unit does not have power adjustment space in the corresponding direction, the AGC instruction is sent to the thermal power group to control the output of the thermal power group.

5. A frequency modulation device for a thermal power unit based on a flywheel lithium battery hybrid energy storage system, characterized in that: The flywheel lithium battery hybrid energy storage system includes a flywheel energy storage unit and a lithium battery energy storage unit, and the device includes: A receiving module, used for receiving an automatic generation control AGC instruction sent by a remote terminal unit RTU; A filtering module is used to filter the AGC instruction based on a preset sampling frequency and a time window width to obtain a high-frequency response power instruction and a low-frequency response power instruction; a control module for, in response to the flywheel energy storage unit having a power adjustment space in a corresponding direction and the lithium battery energy storage unit having a power adjustment space in a corresponding direction, controlling the output of the flywheel energy storage unit based on the high-frequency response power instruction and controlling the output of the lithium battery energy storage unit based on the low-frequency response power instruction according to the maximum output demand and the maximum power adjustment space of the flywheel energy storage unit and the lithium battery energy storage unit; The filtering module is specifically used to: based on the sampling frequency F t and the time window width T, sampling the AGC instruction to obtain a plurality of AGC instruction samples; obtaining a low-frequency response power instruction according to the plurality of AGC instruction samples and a preset low-frequency response power instruction calculation formula; obtaining a high-frequency response power instruction according to the AGC instruction and the low-frequency response power instruction; The low frequency response power command calculation formula is as follows: The high-frequency response power command calculation formula is as follows: in, is the AGC instruction sample at time t, is the low-frequency response power command at time t, is the high-frequency response power instruction at time t, is the number of AGC instruction samples in the cache, is the AGC instruction sample at time t-1, is the AGC instruction sample at time tN.

6. A frequency modulation system for a thermal power unit, characterized in that: include: Remote terminal unit RTU, thermal power unit and flywheel lithium battery hybrid energy storage system, among which, The remote terminal unit RTU is connected to the thermal power unit and the flywheel lithium battery hybrid energy storage system respectively; The flywheel lithium battery hybrid energy storage system includes a flywheel energy storage unit, a lithium battery energy storage unit and an energy storage control unit, wherein the flywheel energy storage unit and the lithium battery energy storage unit are connected in parallel on the A / B section busbar through an energy storage box transformer, and the busbar is connected to the low-voltage side of the high-voltage plant transformer of the thermal power plant through a grid-connected switch and an incoming line switch, and the high-voltage side of the high-voltage plant transformer of the thermal power plant is connected to the thermal power unit; Wherein, the energy storage control unit executes the method according to any one of claims 1 to 4.

7. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 4 is implemented.

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