Method and system for controlling primary frequency modulation of energy storage auxiliary thermal power generating unit based on contribution rate

Abstract

The invention discloses a contribution rate-based primary frequency modulation control method and system for an energy storage assisted thermal power generating unit, and the method comprises the steps: calculating the target contribution rate of the thermal power generating unit and an energy storage system combined with primary frequency modulation under the assistance of energy storage according to the operation state of the thermal power generating unit and the distribution of primary frequency modulation tasks; the actual primary frequency modulation output condition and the energy storage charge state of the thermal power generating unit are considered, the qualified range of the primary frequency modulation contribution rate of the thermal power generating unit is used as a constraint condition, energy storage primary frequency modulation output is calculated, and the charge state is adjusted to the optimal direction while it is guaranteed that the primary frequency modulation contribution rate of energy storage is qualified; the charge state of energy storage is planned in combination with the long-term frequency modulation task of the thermal power generating unit, so that the thermal power generating unit is assisted to complete the long-term primary frequency modulation task under the condition that the charge state of the stored energy is kept, the frequency modulation contribution rate is within the qualified range of the primary frequency modulation contribution rate of the thermal power generating unit, and continuous auxiliary frequency modulation is achieved. Meanwhile, the energy storage charge state is maintained, and the energy storage continuous frequency modulation capacity is improved.

Description

Background Art

[0002] In recent years, the penetration rate of new energy in the power system has been continuously increasing, but at the same time, serious phenomena of wind curtailment and photovoltaic curtailment have emerged. To address this issue, various provinces and cities have successively introduced rules for the frequency modulation auxiliary service market, promoting the deep peak shaving operation of thermal power units. However, this transformation has led to significant changes in the regulation characteristics of thermal power units, not only affecting their economy but also reducing their reliability. Notably, when the operating point of thermal power units decreases, their frequency modulation ability also declines, which seriously affects the frequency balance ability of the power system.

[0003] Currently, as the cornerstone of the power grid's frequency modulation, thermal power units have problems such as slow response speed and decreased response amplitude during deep peak shaving operation. There is an urgent need for other resources to assist the power system in frequency modulation to ensure the safe operation of the power system. With the continuous development of energy storage technology, it provides a new technical solution for the frequency stability problem caused by grid-connected renewable energy, that is, configuring energy storage equipment for thermal power units. The main advantages of configuring fast-response energy storage to improve the primary frequency modulation performance of thermal power units are that the power response of fast-response energy storage is fast and highly customizable, which can make up for the non-linearity and slow response speed problems existing in the primary frequency modulation control of thermal power units; fast-response energy storage has a certain power and energy capacity, which can solve the problem of insufficient frequency modulation resources. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a primary frequency modulation control method and system for energy storage-assisted thermal power units based on contribution rate in view of the deficiencies in the above-mentioned prior art. On the premise of ensuring the safety and high-efficiency operation of energy storage units and thermal power units, it improves the primary frequency modulation qualification rate of the combined system of thermal power units and energy storage, enhances the continuous frequency modulation ability of energy storage, improves the comprehensive operation benefit of the combined system of thermal power units and energy storage, and enhances the support ability of the combined system of thermal power and energy storage for the grid frequency stability, so as to solve the technical problem that the frequency modulation ability of thermal power units is insufficient and affects the grid frequency stability.

[0005] The present invention adopts the following technical solutions: A primary frequency modulation control method for energy storage-assisted thermal power units based on contribution rate, comprising the following steps: Obtain the rated power of the thermal power unit, the speed regulation rate setting, the grid frequency information, and the current operating conditions of the thermal power unit, and determine the qualified range of the primary frequency modulation contribution rate of the thermal power unit; According to the operating status of thermal power units and the distribution of primary frequency regulation tasks, calculate the combined primary frequency regulation target contribution rate of thermal power units and energy storage systems with energy storage assistance. Considering the actual primary frequency regulation output of thermal power units and the state of charge of energy storage, calculate the primary frequency regulation output of energy storage with the qualified range of the primary frequency regulation contribution rate of thermal power units obtained as the constraint condition, so that while ensuring the qualified primary frequency regulation contribution rate of energy storage, the state of charge is adjusted in the best direction; Combine the state of charge of energy storage with the long-term frequency regulation task planning of thermal power units, so that energy storage can assist thermal power units to complete long-term primary frequency regulation tasks while maintaining the state of charge, and meet the frequency regulation contribution rate within the qualified range of the primary frequency regulation contribution rate of thermal power units, realizing continuous auxiliary frequency regulation.

[0006] Preferably, the qualified range of the primary frequency regulation contribution rate of thermal power units is:

[0007] wherein, is the actual contribution power of the thermal power unit for primary frequency regulation; is the theoretical contribution power of the thermal power unit for primary frequency regulation.

[0008] Preferably, when the operating status of the thermal power unit is, is the rated power of the thermal power unit, the disturbance 1 satisfies , the disturbance 2 satisfies , and the disturbance 3 satisfies ; When the operating status of the thermal power unit satisfies , the disturbance 1 satisfies , the disturbance 2 satisfies , and the disturbance 3 satisfies .

[0009] Preferably, while ensuring the qualified primary frequency regulation contribution rate of energy storage, the state of charge is adjusted in the best direction, specifically: According to the different load increase and decrease capabilities of thermal power units at different load points, adjust upward or downward from near the middle value of the state of charge. If the load increase ability of the thermal power unit is stronger than the load decrease ability, the best state of charge is lower than the middle value; if the load increase ability of the thermal power unit is weaker than the load decrease ability, the best state of charge is higher than the middle value.

[0010] Preferably, adjust according to the primary frequency regulation distribution. If the load decrease task is more than the load increase task, the best state of charge is lower than the middle value; if the load increase task is more than the load decrease task, the best state of charge is higher than the middle value.

[0011] Preferably, the combined primary frequency regulation target contribution rate of thermal power units and energy storage systems with energy storage assistance The calculation method is:

[0012] Among them, is the value of the contribution rate coefficient when the primary frequency regulation direction is positive; is the value of the contribution rate coefficient when the primary frequency regulation direction is negative.

[0013] Preferably, the combined primary frequency regulation target contribution rate range of the thermal power unit assisted by energy storage and the energy storage system: , among which, is the lower limit of the qualified contribution rate; is the upper limit of the qualified contribution rate.

[0014] Preferably, the value of the contribution rate coefficient when the primary frequency regulation direction is positive and the value of the contribution rate coefficient when the primary frequency regulation direction is negative are calculated as follows:

[0015]

[0016] Among them, is the current state of charge of the energy storage, is the optimal state of charge of the energy storage.

[0017] Preferably, the primary frequency regulation output of the energy storage is:

[0018] Among them, is the primary frequency regulation target power of the thermal power unit; is the actual primary frequency regulation power of the thermal power unit, is the combined primary frequency regulation target contribution rate of the thermal power unit assisted by energy storage and the energy storage system.

[0019] In the second aspect, the embodiments of the present invention provide a primary frequency regulation control system for an energy storage-assisted thermal power unit based on the contribution rate, including: A data module, which obtains the rated power of the thermal power unit, the speed regulation rate setting, the grid frequency information, and the current operating conditions of the thermal power unit, and determines the qualified range of the primary frequency regulation contribution rate of the thermal power unit; An adjustment module, which calculates the combined primary frequency regulation target contribution rate of the thermal power unit assisted by energy storage and the energy storage system according to the operating state of the thermal power unit and the distribution of the primary frequency regulation tasks, and considers the actual primary frequency regulation output of the thermal power unit and the state of charge of the energy storage, and calculates the primary frequency regulation output of the energy storage with the obtained qualified range of the primary frequency regulation contribution rate of the thermal power unit as a constraint condition, so that while ensuring the qualified primary frequency regulation contribution rate, the state of charge of the energy storage is adjusted in the best direction; The frequency modulation module combines the long-term frequency modulation task planning of the thermal power unit to store the state of charge of the energy storage, enabling the energy storage to assist the thermal power unit to complete the long-term primary frequency modulation task while maintaining the state of charge, and meeting the requirement that the frequency modulation contribution rate is within the qualified range of the primary frequency modulation contribution rate of the thermal power unit, so as to achieve continuous auxiliary frequency modulation.

[0020] In a third aspect, a computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the above-mentioned primary frequency modulation control method for energy storage assisting thermal power units based on the contribution rate are implemented.

[0021] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, including a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned primary frequency modulation control method for energy storage assisting thermal power units based on the contribution rate are implemented.

[0022] In a fifth aspect, a chip includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the above-mentioned primary frequency modulation control method for energy storage assisting thermal power units based on the contribution rate are implemented.

[0023] In a sixth aspect, an embodiment of the present invention provides an electronic device, including a computer program, and when the computer program is executed by the electronic device, the steps of the above-mentioned primary frequency modulation control method for energy storage assisting thermal power units based on the contribution rate are implemented.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects: A primary frequency modulation control method for energy storage assisting thermal power units based on the contribution rate determines the qualified range of the primary frequency modulation contribution rate of the thermal power unit according to the requirements for the primary frequency modulation of the thermal power unit in the "Implementation Rules for the Management of Electric Power Auxiliary Services in the Central China Region (2023 Edition)" and the "Implementation Rules for the Grid-Connected Operation Management of Electric Power in the Central China Region". Then, according to the operating state of the thermal power unit and the distribution of the primary frequency modulation tasks, the optimal state of charge of the energy storage is determined. Finally, the target contribution rate of the primary frequency modulation is determined, and the primary frequency modulation output of the energy storage is changed accordingly, so as to adjust the state of charge of the energy storage towards the optimal state of charge while ensuring the qualified rate of the primary frequency modulation, and improve the continuous frequency modulation ability of the energy storage.

[0025] Furthermore, the input data is relatively easy to obtain and has good timeliness, which can fully reflect the current power grid state.

[0026] Furthermore, on the basis of improving the qualified rate of the primary frequency modulation, the state of charge of the energy storage is maintained, and the continuous frequency modulation ability of the energy storage is improved.

[0027] Furthermore, it can improve the qualified rate of the primary frequency modulation of the thermal power unit according to the requirements of the current evaluation index.

[0028] Furthermore, when the thermal power plant has a strong load - increasing capacity, the energy storage is allowed to store less electricity. In this way, when load reduction is required, the energy storage can quickly discharge to help. On the contrary, if the thermal power plant is better at load reduction, the energy storage is allowed to store more electricity to facilitate charging and helping at any time. At the same time, it will also be dynamically adjusted according to the actual frequency - modulation task type: if the power grid always needs load reduction recently, the "electricity level" of the energy storage is automatically reduced to make room to absorb the excess power; conversely, when load increase is frequently required, the "electricity baseline" of the energy storage is increased to ensure the discharge capacity. This dynamic balance not only avoids the embarrassment that the energy storage "is ineffective when fully charged and unable to help when undercharged", but also enables the thermal power units to work in their proficient load ranges as much as possible. In practical applications, this strategy can increase the frequency - modulation efficiency of the energy - storage system by more than 20% and reduce the ineffective actions of the thermal power units by more than 40%. This is equivalent to both extending the "working life" of the power - plant equipment and keeping the energy - storage battery in the "best combat state" all the time.

[0029] It can be understood that the beneficial effects of the second to sixth aspects above can refer to the relevant descriptions in the first aspect above and will not be elaborated here.

[0030] In summary, on the premise of ensuring the safety and high - efficiency operation of the energy - storage unit and the thermal power unit, the present invention improves the qualified rate of the primary frequency modulation of the thermal power unit, while maintaining the state of charge of the energy storage and enhancing the continuous frequency - modulation ability of the energy storage.

[0031] Next, through the drawings and embodiments, the technical solutions of the present invention will be further described in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the following - described drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 It is a control schematic diagram of the method of the present invention; Figure 2 It is the achievement situation of the typical primary frequency - modulation contribution rate within a day; Figure 3 [[ID=2,6]]It is a partial enlarged view of the achievement situation of the primary frequency - modulation contribution rate; Figure 4 It is a schematic diagram of a computer device provided by an embodiment of the present invention; Figure 5 It is a block diagram of an electronic device provided according to an embodiment of the present invention.

[0034] Among them, 60. computer device; 61. processor; 62. memory; 63. computer program; 600. electronic device; 610. processing unit; 620. storage unit; 6201. random access storage unit; 6202. cache storage unit; 6203. read-only storage unit; 6204. program / utilities; 6205. program module; 630. bus; 640. display unit; 650. input / output interface; 660. network adapter; 700. external device. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "include" and "comprise" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0037] It should also be understood that the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0038] It should be further understood that the term " / and" as used in the specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the related listed items, and includes these combinations. For example, A and / or B can represent three cases: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present invention generally represents an "or" relationship between the related objects before and after.

[0039] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present invention to describe preset ranges, etc., these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range can also be referred to as the second preset range, and similarly, the second preset range can also be referred to as the first preset range.

[0040] Depending on the context, as used herein, the word "if" can be interpreted as "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detecting (stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)".

[0041] Various structural schematic diagrams according to the disclosed embodiments of the present invention are shown in the drawings. These figures are not drawn to scale, where for the purpose of clear expression, some details are enlarged and some details may be omitted. The shapes of various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. And those skilled in the art can design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0042] The present invention provides a primary frequency regulation control method for a thermal power unit assisted by energy storage based on contribution rate, which measures and collects grid frequency data, the primary frequency regulation target power of the thermal power unit, and the real-time output power of the thermal power unit; receives the grid frequency data, the primary frequency regulation target power of the thermal power unit, and the real-time output power of the thermal power unit sent from the frequency regulation and operation condition monitoring device of the thermal power unit; according to the above information, combines the requirements of the primary frequency regulation performance index of the grid, calculates the qualified range of the primary frequency regulation contribution rate of the thermal power unit; determines the optimal state of charge of the energy storage according to the operation state of the thermal power unit and the distribution of the primary frequency regulation tasks; combines the current state of charge of the energy storage, calculates the combined primary frequency regulation target contribution rate of the thermal power unit and the energy storage system with the assistance of the energy storage; according to the actual primary frequency regulation output situation of the thermal power unit, the energy storage makes up for the insufficient part of the primary frequency regulation task of the thermal power unit; sends the calculation result to the own energy management system of the energy storage, and the energy storage adjusts the primary frequency regulation output, and a primary frequency regulation control method for a thermal power unit assisted by energy storage based on contribution rate is completed.

[0043] Embodiment 1 Please refer to Figure 1 , a primary frequency regulation control method for a thermal power unit assisted by energy storage according to the present invention, includes the following steps: S1. Obtain the rated power of the thermal power unit, the setting of the speed regulation rate, the grid frequency information, and the current operation situation of the thermal power unit, and combine the requirements for the primary frequency regulation of the thermal power unit in the "Implementation Rules for the Management of Power Auxiliary Services in the Central China Region (2023 Edition)" and the "Implementation Rules for the Grid Connection Operation Management of Power in the Central China Region" to determine the qualified range of the primary frequency regulation contribution rate of the thermal power unit; The primary frequency regulation contribution rate of the thermal power unit is:

[0044] Among them, is the primary frequency regulation contribution rate of the thermal power unit / %; is the actual contribution power of the thermal power unit for primary frequency regulation / MW·h; is the theoretical contribution power of the thermal power unit for primary frequency regulation / MW·h.

[0045] For thermal power units, the assessment of their contribution rate is related to whether they are in the deep peak shaving state and the magnitude of the disturbance. The specific calculation method is shown in the following table. When the thermal power unit is in the deep peak shaving state and the disturbance is small, the requirement for the contribution rate is relatively loose, while when the thermal power unit is in the normal operating condition and the disturbance is large, the requirement for the contribution rate is relatively strict.

[0046]

[0047] Among them, is the rated power of the thermal power unit / MW, is the primary frequency regulation contribution rate of the thermal power unit.

[0048] S2. According to the operating state of the thermal power unit and the distribution of the primary frequency regulation tasks, calculate the combined primary frequency regulation target contribution rate of the thermal power unit with energy storage assistance and the energy storage system. Considering the actual primary frequency regulation output of the thermal power unit and the state of charge of the energy storage, calculate the primary frequency regulation output of the energy storage with the qualified range of the primary frequency regulation contribution rate of the thermal power unit obtained as the constraint condition, so that while ensuring the qualified primary frequency regulation contribution rate, the state of charge of the energy storage is adjusted in the best direction.

[0049] Specifically, the combined primary frequency regulation target contribution rate of the thermal power unit with energy storage assistance and the energy storage system Range is:

[0050] Among them, is the lower limit of the qualified contribution rate, which is determined by the current disturbance magnitude and the current load point of the thermal power unit; is the upper limit of the qualified contribution rate.

[0051] Specifically, the combined primary frequency regulation target contribution rate of the thermal power unit with energy storage assistance and the energy storage system Calculation method is:

[0052] Among them, is the value of the contribution rate coefficient when the primary frequency regulation direction is positive; is the value of the contribution rate coefficient when the primary frequency regulation direction is negative. Specifically, the calculation method is.

[0053]

[0054]

[0055] Among them, is the current state of charge of the energy storage, is the optimal state of charge of the energy storage.

[0056] Specifically, the calculation method of the primary frequency regulation output of the energy storage is as follows:

[0057] S3. Combine the long-term frequency regulation task plan of the thermal power unit to plan the state of charge of the energy storage, so that the energy storage can assist the thermal power unit to complete the long-term primary frequency regulation task when the state of charge is maintained at a good level, and ensure that the frequency regulation contribution rate is within the required qualified range, so as to meet the requirement that the energy storage system has a stronger continuous frequency regulation assistance ability.

[0058] Those skilled in the art of the present invention can understand that various aspects of the present invention can be implemented as a system, a method, or a program product. Therefore, various aspects of the present invention can be specifically implemented in the following forms, namely: a complete hardware implementation, a complete software implementation (including firmware, microcode, etc.), or an implementation combining hardware and software aspects, which can be collectively referred to as "circuit", "module", or "platform" here.

[0059] Embodiment 2 The present invention provides a primary frequency regulation control system for an energy storage-assisted thermal power unit based on the contribution rate. This system can be used to implement the primary frequency regulation control method for an energy storage-assisted thermal power unit based on the contribution rate. Specifically, the primary frequency regulation control system for an energy storage-assisted thermal power unit based on the contribution rate includes a data module, an adjustment module, and a frequency regulation module.

[0060] Among them, the data module obtains the rated power of the thermal power unit, the speed regulation rate setting, the grid frequency information, and the current operating conditions of the thermal power unit, and determines the qualified range of the primary frequency regulation contribution rate of the thermal power unit; The adjustment module calculates the combined primary frequency regulation target contribution rate of the thermal power unit and the energy storage system with the assistance of the energy storage according to the operating state of the thermal power unit and the distribution of the primary frequency regulation task. Considering the actual primary frequency regulation output of the thermal power unit and the state of charge of the energy storage, and taking the obtained qualified range of the primary frequency regulation contribution rate of the thermal power unit as a constraint condition, it calculates the primary frequency regulation output of the energy storage, so that the energy storage adjusts the state of charge in the best direction while ensuring the qualified primary frequency regulation contribution rate; The frequency regulation module combines the long-term frequency regulation task of the thermal power unit to plan the state of charge of the energy storage, so that the energy storage can assist the thermal power unit to complete the long-term primary frequency regulation task while maintaining the state of charge, and meet the requirement that the frequency regulation contribution rate is within the qualified range of the primary frequency regulation contribution rate of the thermal power unit, so as to achieve continuous frequency regulation assistance.

[0061] Embodiment 3 The present invention provides a terminal device, which includes a processor and a memory. The memory is used to store a computer program, and the computer program includes program instructions. The processor is used to execute the program instructions stored in the computer storage medium. The processor may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Graphics Processing Units (GPUs), Tensor Processing Units (TPUs), Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, and is suitable for implementing one or more instructions. Specifically, it is suitable for loading and executing one or more instructions to implement the corresponding method flow or corresponding function. The processor described in the embodiments of the present invention can be used for the operation of the energy storage-assisted primary frequency regulation control method for thermal power units based on the contribution rate, including: Obtain the rated power of the thermal power unit, the speed regulation rate setting, the grid frequency information, and the current operating conditions of the thermal power unit, and determine the qualified range of the primary frequency regulation contribution rate of the thermal power unit; according to the operating state of the thermal power unit and the distribution of the primary frequency regulation tasks, calculate the combined primary frequency regulation target contribution rate of the thermal power unit with energy storage assistance and the energy storage system. Considering the actual primary frequency regulation output of the thermal power unit and the state of charge of the energy storage, and taking the obtained qualified range of the primary frequency regulation contribution rate of the thermal power unit as a constraint condition, calculate the primary frequency regulation output of the energy storage, so that while ensuring the qualified primary frequency regulation contribution rate, the state of charge of the energy storage is adjusted in the best direction; combine the long-term frequency regulation task plan of the thermal power unit to store the state of charge of the energy storage, so that the energy storage can assist the thermal power unit to complete the long-term primary frequency regulation task while maintaining the state of charge, and meet the frequency regulation contribution rate within the qualified range of the primary frequency regulation contribution rate of the thermal power unit, so as to achieve continuous auxiliary frequency regulation.

[0062] Please refer to Figure 4, the terminal device is a computer device. The computer device 60 in this embodiment includes: a processor 61, a memory 62, and a computer program 63 stored in the memory 62 and executable on the processor 61. When the computer program 63 is executed by the processor 61, it implements the method for primary frequency regulation control of a thermal power unit assisted by energy storage based on the contribution rate in the embodiment. To avoid repetition, it will not be elaborated here one by one. Alternatively, when the computer program 63 is executed by the processor 61, it implements the functions of each model / unit in the primary frequency regulation control system of a thermal power unit assisted by energy storage based on the contribution rate in the embodiment. To avoid repetition, it will not be elaborated here one by one.

[0063] The computer device 60 can be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The computer device 60 may include, but is not limited to, a processor 61 and a memory 62. Those skilled in the art can understand that Figure 4 merely examples of the computer device 60, which do not constitute a limitation on the computer device 60, may include more or fewer components than those shown in the figure, or combine certain components, or different components. For example, the computer device may also include input / output devices, network access devices, buses, etc.

[0064] The so-called processor 61 may be a central processing unit (CPU), or may also be other general-purpose processors, a graphics processing unit (GPU), a tensor processing unit (TPU), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0065] The memory 62 may be an internal storage unit of the computer device 60, such as the hard disk or memory of the computer device 60. The memory 62 may also be an external storage device of the computer device 60, such as a plug-in hard disk equipped on the computer device 60, a smart media card (SMC), a secure digital (SD) card, a flash card, etc.

[0066] Further, the memory 62 may also include both the internal storage unit of the computer device 60 and external storage devices. The memory 62 is used to store computer programs as well as other programs and data required by the computer device. The memory 62 may also be used to temporarily store data that has been output or is to be output.

[0067] Please refer to Figure 5 , the terminal device is an electronic device 600, and the electronic device 600 is presented in the form of a general-purpose computing device. The components of the electronic device may include, but are not limited to: at least one processing unit 610, at least one storage unit 620, a bus 630 connecting different platform components (including the storage unit 620 and the processing unit 610), a display unit 640, etc.

[0068] Among them, the storage unit stores program code, and the program code can be executed by the processing unit 610, so that the processing unit 610 executes the steps according to various exemplary embodiments of the present invention described in the above method part of this specification. For example, the processing unit 610 can execute steps as shown in Figure 1 .

[0069] The storage unit 620 may include a readable medium in the form of a volatile storage unit, such as a random access storage unit (RAM) 6201 and / or a cache storage unit 6202, and may further include a read-only storage unit (ROM) 6203.

[0070] The storage unit 620 may also include a program / utilities 6204 having a set (at least one) of program modules 6205. Such program modules 6205 include, but are not limited to: an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include the implementation of a network environment.

[0071] The bus 630 may represent one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any of the multiple bus structures.

[0072] The electronic device 600 can also communicate with one or more external devices 700 (such as a keyboard, a pointing device, a Bluetooth device, etc.), and can also communicate with one or more devices that enable a user to interact with the electronic device 600, and / or communicate with any device (such as a router, a modem) that enables the electronic device 600 to communicate with one or more other computing devices. Such communication can be carried out through the input / output interface 650. Moreover, the electronic device 600 can also communicate with one or more networks (such as a local area network, a wide area network, and / or a public network, such as the Internet) through the network adapter 660. The network adapter 660 can communicate with other modules of the electronic device 600 through the bus 630. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in combination with the electronic device 600, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage platforms, etc.

[0073] Embodiment 4 The present invention also provides a storage medium, specifically a computer-readable storage medium, which is a memory device in a terminal device and is used to store programs and data. It can be understood that the computer-readable storage medium here can include both the built-in storage medium in the terminal device and, of course, the extended storage medium supported by the terminal device. It can be any tangible medium that contains or stores a program, and this program can be used by or in combination with an instruction execution system, apparatus, or device. The computer-readable storage medium provides a storage space, and this storage space stores the operating system of the terminal. Moreover, one or more instructions suitable for being loaded and executed by a processor are stored in this storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that more specific examples of the computer-readable storage medium here include: an electrical connection having one or more wires, a portable disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical fiber, a portable compact disc read-only memory, an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0074] The computer-readable storage medium also includes a data signal propagated in a baseband or as part of a carrier wave, which carries the readable program code. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The readable storage medium can also be any readable medium other than the readable storage medium, and this readable medium can send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the readable storage medium can be transmitted using any appropriate medium, including but not limited to wireless, wired, optical fiber cable, radio frequency, etc., or any suitable combination of the above.

[0075] The program code for performing the operations of the present invention can be written in any combination of one or more programming languages. The programming languages include object-oriented programming languages such as Java, C++, etc., and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computing device, partially on the user's device, executed as an independent software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device can be connected to the user's computing device through any type of network, including a local area network or a wide area network, or can be connected to an external computing device (for example, by using an Internet service provider to connect through the Internet).

[0076] One or more instructions stored in the computer-readable storage medium can be loaded and executed by a processor to implement the corresponding steps of the method for primary frequency modulation control of a thermal power unit assisted by energy storage based on the contribution rate in the above embodiments; the one or more instructions in the computer-readable storage medium are loaded and executed by the processor to perform the following steps: Obtain the rated power of the thermal power unit, the speed regulation rate setting, the grid frequency information, and the current operating conditions of the thermal power unit, and determine the qualified range of the primary frequency modulation contribution rate of the thermal power unit; according to the operating state of the thermal power unit and the distribution of the primary frequency modulation tasks, calculate the combined primary frequency modulation target contribution rate of the thermal power unit assisted by energy storage and the energy storage system, and consider the actual primary frequency modulation output of the thermal power unit and the state of charge of the energy storage to obtain the qualified range of the primary frequency modulation contribution rate of the thermal power unit as a constraint condition, and calculate the primary frequency modulation output of the energy storage so that while ensuring the qualified primary frequency modulation contribution rate, the state of charge of the energy storage is adjusted in the best direction; combine the long-term frequency modulation task plan of the thermal power unit to plan the state of charge of the energy storage, so that the energy storage can assist the thermal power unit to complete the long-term primary frequency modulation task while maintaining the state of charge, and meet the frequency modulation contribution rate within the qualified range of the primary frequency modulation contribution rate of the thermal power unit, so as to achieve continuous frequency modulation assistance.

[0077] In each of the embodiments provided in this application, the databases involved may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., and is not limited thereto. In each of the embodiments provided in this application, the processors involved may be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., and is not limited thereto.

[0078] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0079] I. Simulation experiment design 1. Experimental platform construction Use MATLAB / Simulink to build a combined thermal energy and energy storage frequency regulation system model Thermal power unit model: including boiler - steam turbine - generator dynamic characteristics Energy storage system model: lithium battery energy storage (considering charge and discharge efficiency, SOC - voltage characteristics) Power grid frequency dynamic model: adopt a typical second-order system frequency response model 2. Parameter setting examples Thermal power unit capacity: 300MW; Speed regulation rate: 4%; Energy storage capacity: 30 / 15 (energy / power) MWh / MW; Initial SOC value: 50%; Frequency regulation dead zone: ±0.033Hz.

[0080] 3. Comparative experiment design Scenario 1: Traditional frequency regulation without energy storage assistance; Scenario 2: Energy storage assisted frequency regulation with fixed SOC (50%); Scenario 3: Dynamic SOC adjustment strategy of this method; Disturbance types: step load change (±2%Pn), continuous random fluctuation (IEEE standard test signal).

[0081] II. Key Data Monitoring Indicators Frequency Dynamic Indicator: Maximum Frequency Deviation (Δf_max) Frequency Settling Time (t_settling) Rate of Change of Frequency (RoCoF) Unit Output Characteristics: Output Change of Thermal Power Unit ΔP_g Output of Energy Storage ΔP_ess Contribution Rate of Combined Frequency Regulation: η = ΔP_g / (ΔP_g + ΔP_ess) SOC Dynamic: SOC Change Trajectory Number of Times SOC Exceeds Limit Average Charge and Discharge Depth III. Examples of Typical Simulation Results Comparison of Step Disturbance Responses (+2% Load Sudden Change)

[0082] Frequency Modulation Effect of Continuous Random Fluctuations (1-hour Simulation)

[0083] IV. Verification of SOC Optimization Strategy Design different load characteristic scenarios to verify the SOC adjustment logic: Scenario dominated by load increase (70% of the frequency regulation tasks are for frequency reduction); Theoretical Optimal SOC: 55%; Actual Simulated Stable Value of SOC: 53.8% - 56.2%; Response time of frequency reduction tasks is shortened by 22%; Scenario dominated by load decrease (65% of the frequency regulation tasks are for frequency increase); Theoretical Optimal SOC: 45%; Actual Simulated Stable Value of SOC: 43.5% - 46.7%; Response ability of frequency increase tasks is improved by 18%.

[0084] V. Long-term Frequency Regulation Verification 72-hour continuous operation data:

[0085] Combined frequency modulation reduces the frequency deviation by 32% and shortens the stabilization time by 41%. The SOC dynamic adjustment strategy increases the availability of energy storage by 27%. The contribution rate always remains within the qualified range of 55% - 65%. Through the dynamic adjustment of the SOC target value, the utilization rate of the frequency modulation ability of the energy storage system is increased to 92%, and the action frequency of the thermal power unit is reduced by 63%, significantly reducing the wear of the unit. During long-term operation, the self-recovery characteristic of SOC maintains the continuous frequency modulation ability.

[0086] Please refer to Figure 2 , from 0 to 4 o'clock, without the assistance of energy storage, the primary frequency modulation of the thermal power unit in the deep peak shaving state cannot reach the required contribution rate, while with the assistance of energy storage, it can better complete the primary frequency modulation task.

[0087] Please refer to Figure 3 , the auxiliary output of energy storage will change according to the change of the contribution rate. During 996 - 998 minutes, a disturbance with a magnitude exceeding 0.06 Hz occurred, and at this time the requirement for the contribution rate also became not exceeding 1.0. The method of the present invention can well change its own output according to this situation to meet the requirements of the contribution rate and the need to adjust its own state of charge.

[0088] In summary, the primary frequency modulation control method and system for a thermal power unit assisted by energy storage based on the contribution rate of the present invention makes the grid frequency more stable and extends the service life of power plant equipment. Specifically, through the collaborative work of the energy storage battery and the thermal power unit (the thermal power is the main force and the energy storage is the auxiliary), when the power consumption of the grid fluctuates, the energy storage can quickly respond to the frequency change like a spring, reducing the grid fluctuation amplitude by nearly one-third and accelerating the recovery speed by 40%. At the same time, according to the change law of the peak and trough of power consumption, the energy storage power is intelligently adjusted - more electricity is stored during the peak power consumption period and more electricity is discharged during the trough period, which not only avoids the impact of the energy storage battery being fully charged or discharged for a long time on its life, but also enables the thermal power unit to make fewer drastic actions. Experiments show that the action times of the thermal power equipment are reduced by 60%, which is equivalent to reducing mechanical wear. During long-term operation, this system can also automatically maintain the power of the energy storage in the healthy range of 40% - 60%, just like the intelligent charging of a mobile phone, which can not only respond to emergency frequency modulation tasks at any time, but also maintain the battery life; ultimately achieving the triple effects of a safer grid, more cost-saving power plants, and more durable energy storage equipment.

[0089] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above-mentioned division of each functional unit and module is used as an example. In practical applications, the above functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of each functional unit and module are only for the convenience of mutual distinction and do not limit the protection scope of this application. The specific working processes of the units and modules in the above system can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0090] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0091] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in the present invention can be implemented by electronic hardware, or by a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0092] In the embodiments provided by the present invention, it should be understood that the disclosed device / terminal and method can be implemented in other ways. For example, the device / terminal embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical functional division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, and the indirect couplings or communication connections of the devices or units can be in electrical, mechanical or other forms.

[0093] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0094] In addition, in each embodiment of the present invention, each functional unit may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of a software functional unit.

[0095] If the above-mentioned integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on this understanding, to implement all or part of the processes in the above-mentioned embodiment methods of the present invention, it may also be completed by a computer program instructing relevant hardware. The computer program may be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above-mentioned various method embodiments may be implemented. Among them, the computer program includes computer program code, and the computer program code may be in the form of source code, object code, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0096] This application is described with reference to the flowcharts and / or block diagrams of methods, devices, and computer program products according to the embodiments of this application. It should be understood that each process and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, and the combination of processes and / or blocks in the flowchart and / or block diagram can also be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate a device for implementing the specified functions in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0097] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured product including an instruction device, and the instruction device implements the process in Figure 1One process or multiple processes and / or boxes Figure 1 The functions specified in one box or multiple boxes.

[0098] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one process Figure 1 One process or multiple processes and / or boxes Figure 1 The steps of the functions specified in one box or multiple boxes.

[0099] The above content is only to illustrate the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention fall within the protection scope of the claims of the present invention.

Claims

1. A primary frequency regulation control method for energy storage assisted thermal power units based on contribution rate, characterized in that Including the following steps: Obtain the rated power of the thermal power unit, set the speed regulation rate, grid frequency information, and the current operating conditions of the thermal power unit, and determine the qualified range of the primary frequency regulation contribution rate of the thermal power unit; According to the operating state of the thermal power unit and the distribution of the primary frequency regulation tasks, calculate the combined primary frequency regulation target contribution rate of the thermal power unit and the energy storage system with energy storage assistance. Considering the actual primary frequency regulation output of the thermal power unit and the state of charge of the energy storage, with the obtained qualified range of the primary frequency regulation contribution rate of the thermal power unit as the constraint condition, calculate the primary frequency regulation output of the energy storage, so that while ensuring the qualified primary frequency regulation contribution rate, the state of charge of the energy storage is adjusted in the best direction; Combine the long-term frequency regulation task of the thermal power unit to plan the state of charge of the energy storage, so that the energy storage can assist the thermal power unit to complete the long-term primary frequency regulation task while maintaining the state of charge, and meet the frequency regulation contribution rate within the qualified range of the primary frequency regulation contribution rate of the thermal power unit, realizing continuous auxiliary frequency regulation.

2. The primary frequency regulation control method of the energy storage assisted thermal power unit based on the contribution rate according to claim 1, characterized in that Qualified range of primary frequency regulation contribution rate of thermal power units is as follows: Among them, is the actual contributed power of the primary frequency regulation of the thermal power unit; is the theoretical contributed power of the primary frequency regulation of the thermal power unit.

3. The primary frequency regulation control method for a thermal power unit assisted by energy storage based on the contribution rate according to claim 2, wherein When the operating state of the thermal power unit is the rated power of the thermal power unit, disturbance 1 satisfies , disturbance 2 satisfies , disturbance 3 satisfies ; When the operating state of the thermal power unit meets , disturbance 1 meets , disturbance 2 meets , disturbance 3 meets .

4. The primary frequency regulation control method for a thermal power unit assisted by energy storage based on the contribution rate according to claim 1, wherein While ensuring the qualified primary frequency regulation contribution rate, adjust the state of charge of the energy storage in the best direction, specifically: According to the different load increase and decrease capabilities of the thermal power unit at different load points, adjust upward or downward from near the middle value of the state of charge. If the load increase ability of the thermal power unit is stronger than the load decrease ability, the optimal state of charge is lower than the middle value; if the load increase ability of the thermal power unit is weaker than the load decrease ability, the optimal state of charge is higher than the middle value.

5. The primary frequency regulation control method for a thermal power unit assisted by energy storage based on the contribution rate according to claim 4, wherein Adjust according to the primary frequency regulation distribution. If the load decrease task is more than the load increase task, the optimal state of charge is lower than the middle value; if the load increase task is more than the load decrease task, the optimal state of charge is higher than the middle value.

6. The primary frequency regulation control method for a thermal power unit assisted by energy storage based on the contribution rate according to claim 1, wherein Combined primary frequency regulation target contribution rate of thermal power units assisted by energy storage and energy storage systems The calculation method is as follows: Among them, is the value of the contribution rate coefficient when the primary frequency regulation direction is positive; is the value of the contribution rate coefficient when the primary frequency regulation direction is negative.

7. The primary frequency regulation control method of the energy storage assisted thermal power unit based on the contribution rate according to claim 6, wherein Range of combined primary frequency regulation target contribution rate of thermal power units assisted by energy storage and energy storage systems: , where is the lower limit of qualified contribution rate; is the upper limit of qualified contribution rate.

8. The primary frequency regulation control method for a thermal power unit assisted by energy storage based on the contribution rate according to claim 7, wherein Value of contribution rate coefficient when primary frequency regulation direction is positive and value of contribution rate coefficient when primary frequency regulation direction is negative are calculated as follows: Among them, is the current state of charge of the energy storage, is the optimal state of charge of the energy storage.

9. The primary frequency regulation control method for a thermal power unit assisted by energy storage based on contribution rate according to claim 1, wherein Energy storage primary frequency regulation output is as follows: Among them, is the primary frequency regulation target power of the thermal power unit; is the actual power of the primary frequency regulation of the thermal power unit, is the combined primary frequency regulation target contribution rate of the thermal power unit and the energy storage system assisted by energy storage.

10. A primary frequency regulation control system for a thermal power unit assisted by energy storage based on contribution rate, characterized in that, Including: A data module that obtains the rated power of the thermal power unit, sets the speed regulation rate, grid frequency information, and the current operating conditions of the thermal power unit, and determines the qualified range of the primary frequency regulation contribution rate of the thermal power unit; An adjustment module that calculates the combined primary frequency regulation target contribution rate of the thermal power unit and the energy storage system with energy storage assistance according to the operating state of the thermal power unit and the distribution of the primary frequency regulation tasks. Considering the actual primary frequency regulation output of the thermal power unit and the state of charge of the energy storage, with the obtained qualified range of the primary frequency regulation contribution rate of the thermal power unit as the constraint condition, calculates the primary frequency regulation output of the energy storage, so that while ensuring the qualified primary frequency regulation contribution rate, the state of charge of the energy storage is adjusted in the best direction; A frequency regulation module that combines the long-term frequency regulation task of the thermal power unit to plan the state of charge of the energy storage, so that the energy storage can assist the thermal power unit to complete the long-term primary frequency regulation task while maintaining the state of charge, and meet the frequency regulation contribution rate within the qualified range of the primary frequency regulation contribution rate of the thermal power unit, realizing continuous auxiliary frequency regulation.

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