Inertial frequency modulation power distribution and closed-loop control method, device and equipment for wind farm

Abstract

The present application relates to the field of wind farm group control, and embodiments thereof provide a wind farm inertia frequency modulation power distribution and closed-loop control method, device and equipment. One of the wind farm inertia frequency modulation power distribution and closed-loop control methods comprises: determining an inertia frequency modulation active power adjustment amount and a target unit to be adjusted, generating an adjustment instruction according to a rotational speed constraint and an adjustable power constraint of the target unit; determining the inertia frequency modulation active power adjustment amount in real time in the process of executing the adjustment instruction by the target unit; and performing secondary dynamic compensation when the inertia frequency modulation active power adjustment amount is greater than a set threshold. The embodiments of the present application also provide corresponding devices and equipment. The embodiments provided by the present application fully exert the inertia frequency modulation capability of adjustable units, quickly adjust the overall power of the wind farm, and meet the target power demand of the field-level inertia frequency modulation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind farm group control, in particular to a wind farm inertia frequency modulation power distribution and closed-loop control method, a wind farm inertia frequency modulation power distribution and closed-loop control device, a wind farm inertia frequency modulation power distribution and closed-loop control equipment and a computer readable storage medium. BACKGROUND

[0002] With the rapid growth of wind power installed capacity, the capacity of wind power centralized sending is getting larger and larger. The output of wind turbine has strong volatility and uncertainty, which makes the large-scale wind power collection area present the typical characteristics of high wind power penetration and weak local power grid. In the case of high wind power penetration, the difficulty of power grid primary frequency modulation increases sharply, so it is necessary to fully tap the primary frequency modulation capacity of existing wind turbines, so that the wind farm has the function of primary frequency modulation, and solves the problem of difficult primary frequency modulation of power grid.

[0003] The inertia response control of wind turbine is a way to release the kinetic energy of rotor to realize power control, which can increase or decrease the output of the unit in a short time and support the change of power grid frequency. At present, the research on wind farm station level inertia frequency modulation mainly focuses on the implementation method of field level inertia frequency modulation, how to realize the distribution of single machine inertia frequency modulation target value, but the rationality and accuracy of single machine inertia frequency modulation target value distribution, and the effect of whole field frequency modulation in the execution process and subsequent compensation means are less studied. SUMMARY

[0004] The purpose of the embodiment of the present application is to provide a wind farm inertia frequency modulation power distribution and closed-loop control method, device and equipment, which mainly solves the problems of poor adjustment effect and unreasonable power distribution of wind turbine.

[0005] In order to achieve the above purpose, the first aspect of the present application provides a wind farm inertia frequency modulation power distribution and closed-loop control method, which comprises: determining the inertia frequency modulation active power adjustment amount and the target unit to be adjusted, generating adjustment instruction according to the speed constraint and adjustable power constraint of the target unit; in the process of executing the adjustment instruction by the target unit, the inertia frequency modulation active power adjustment amount is determined in real time; when the inertia frequency modulation active power adjustment amount is greater than the set threshold, secondary dynamic compensation is carried out.

[0006] Preferably, the adjustment instruction is generated according to the speed constraint and the adjustable power constraint of the target unit, comprising: determining a speed adjustment amount according to the current speed of the target unit and the speed constraint, and determining a first distribution coefficient according to the speed adjustment amount; determining an adjustable power constraint according to the current active power and the rated power of the target unit, and determining a second distribution coefficient according to the adjustable power constraint; determining an inertia frequency modulation power target of the target unit according to the first distribution coefficient and the second distribution coefficient; and generating a corresponding adjustment instruction according to the inertia frequency modulation power target.

[0007] Preferably, the speed adjustment amount is determined according to the current speed of the target unit and the speed constraint, and the first distribution coefficient is determined according to the speed adjustment amount, comprising: determining the upper limit or lower limit of the speed in the speed constraint as a reference speed according to the adjustment trend of the target unit; obtaining the difference between the current speed and the reference speed as the speed adjustment amount; determining the proportion of the speed adjustment amount of the target unit in the total of the speed adjustment amounts of all target units participating in inertia frequency modulation; and taking the proportion as the first distribution coefficient.

[0008] Preferably, the adjustable power constraint is determined according to the current active power and the rated power of the target unit, and the second distribution coefficient is determined according to the adjustable power constraint, comprising: determining the upper limit or lower limit of the rated power in the adjustable power constraint as a reference power according to the adjustment trend of the target unit; obtaining the difference between the current active power and the reference power as the power adjustment amount; determining the proportion of the power adjustment amount of the target unit in the total of the power adjustment amounts of all target units participating in inertia frequency modulation; and taking the proportion as the second distribution coefficient.

[0009] Preferably, the inertia frequency modulation power target of the target unit is determined according to the first distribution coefficient and the second distribution coefficient, comprising: determining corresponding adjustment weights for the first distribution coefficient and the second distribution coefficient; obtaining a comprehensive coefficient according to the first distribution coefficient, the second distribution coefficient, and the corresponding adjustment weights; and determining the inertia frequency modulation power target of the target unit according to the inertia frequency modulation active power adjustment amount and the comprehensive coefficient.

[0010] Preferably, the real-time determination of the inertia frequency modulation active power adjustment amount comprises: determining the inertia frequency modulation active power adjustment amount at a set period; and correspondingly, the generated instruction of the secondary dynamic compensation is superimposed into the adjustment instruction in the last period.

[0011] Preferably, the secondary dynamic compensation adopts a feedforward double-PI closed-loop control method; and the feedforward double-PI closed-loop control method comprises: adjusting by using a current inner loop PI adjuster and adjusting by using a voltage outer loop PI adjuster.

[0012] In a second aspect of the present invention, a wind farm inertia frequency regulation power distribution and closed-loop control device is also provided. The device includes: an adjustment command module, configured to determine the inertia frequency regulation active power adjustment amount and the target turbine unit to be adjusted, and generate an adjustment command based on the speed constraint and adjustable power constraint of the target turbine unit; and an adjustment monitoring module, configured to determine the inertia frequency regulation active power adjustment amount in real time during the execution of the adjustment command by the target turbine unit; and perform secondary dynamic compensation when the inertia frequency regulation active power adjustment amount is greater than a set threshold.

[0013] In a third aspect of the present invention, a wind farm inertia frequency modulation power distribution and closed-loop control device is also provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the aforementioned wind farm inertia frequency modulation power distribution and closed-loop control method.

[0014] In a fourth aspect of the invention, a computer-readable storage medium is also provided, wherein instructions are stored therein, which, when executed on a computer, cause the computer to perform the steps of the aforementioned wind farm inertia frequency modulation power allocation and closed-loop control method.

[0015] A fifth aspect of the present invention provides a computer program product, including a computer program that, when executed by a processor, implements the aforementioned wind farm inertia frequency modulation power allocation and closed-loop control method.

[0016] The above technical solution has at least the following beneficial effects:

[0017] This invention considers the motor speed and upper and lower limits of the wind turbine generator's operating power as constraints to achieve a reasonable allocation of the inertia frequency regulation power target for turbines in different operating states within a wind farm. Simultaneously, it dynamically considers the turbine's ability to execute the inertia frequency regulation target power, relying on feedforward dual-PI closed-loop control for secondary dynamic compensation allocation of the turbine power target. This avoids situations where some turbines cannot fully execute the inertia frequency regulation command due to their own reasons, leading to substandard overall farm regulation. It fully utilizes the inertia frequency regulation capability of adjustable turbines, rapidly adjusting the overall farm power to meet the farm-level inertia frequency regulation target power requirements. Furthermore, it avoids faults such as wind turbine disconnection caused by unreasonable inertia response power allocation among grid-connected wind turbines within the farm, which would affect the overall farm regulation effect.

[0018] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 The illustration shows a schematic diagram of the implementation of the wind farm inertia frequency modulation power distribution and closed-loop control method according to an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the field-level inertia frequency modulation logic according to an embodiment of the present invention is shown.

[0022] Figure 3 The schematic diagram illustrates the structure of a wind farm inertia frequency modulation power distribution and closed-loop control device according to an embodiment of the present invention. Detailed Implementation

[0023] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0024] Figure 1 The illustration shows a schematic diagram of an implementation of a wind farm inertia-modulated frequency power distribution and closed-loop control method according to an embodiment of the present invention. Figure 1 As shown, the method includes:

[0025] S01. Determine the inertia frequency regulation active power adjustment amount and the target unit to be adjusted, and generate adjustment commands based on the speed constraints and adjustable power constraints of the target unit; the determination of the inertia frequency regulation active power adjustment amount can be carried out in the following way: the field-level controller obtains the frequency change rate df / dt of the wind farm grid connection point outgoing line through a high-performance frequency acquisition device, and calculates the inertia frequency regulation active power adjustment amount ΔP of the entire field according to the grid standard;

[0026]

[0027] Among them, T J f is the station's inertial time constant; N The system's rated frequency is P; f is the grid connection point frequency; P is the system's rated frequency. N This refers to the rated capacity of the power station. Simultaneously, the active power adjustment ΔP for inertial frequency regulation is limited according to power grid requirements, typically to 10% of the total rated capacity of the station.

[0028] The method for determining the target turbine units to be adjusted can be as follows: Set upper and lower limits for inertia frequency regulation speed based on the normal operating speed limits of the wind turbine units. Accordingly, divide all operating turbine units in the entire site into those that can participate in inertia frequency regulation and those that cannot. Only allocate target power for inertia frequency regulation to the units that can participate. Simultaneously, during the inertia adjustment process, if the turbine speed exceeds the upper and lower limits for inertia frequency regulation, inertia frequency regulation will be discontinued, and the original power will be restored.

[0029] For the target power allocation of units that can participate in inertia frequency regulation, the motor speed and adjustable power margin during unit operation are taken into account, and the unit inertia frequency regulation power target for the first cycle is issued.

[0030] S02. During the execution of the adjustment command by the target unit, the adjustment amount of the inertia frequency modulation active power is determined in real time; when the adjustment amount of the inertia frequency modulation active power is greater than the set threshold, secondary dynamic compensation is performed.

[0031] Because the current technology for inertia frequency modulation power target allocation is too idealistic and does not consider the situation where the unit cannot actually execute the inertia frequency modulation target command, it cannot accurately execute the field-level inertia frequency modulation target. This step adds a feedforward dual PI closed-loop control loop. If the actual value P of the total active power of the field is within the set period (which can be set according to the grid standard), act With the set value P set If the difference between P0 and ΔP still cannot meet the requirement of 1% of the rated capacity of the entire plant (which can be set according to the power grid standard), then a secondary dynamic compensation allocation of the unit power target will be carried out to give full play to the inertia frequency regulation capability of the adjustable unit, increase the adjustment target of the adjustable unit to compensate the unit whose action is not in place, and ensure that the power demand of the plant-level inertia frequency regulation target is met.

[0032] This implementation method, through the above steps, can improve the adjustment efficiency and effect of wind farm inertia frequency regulation power.

[0033] In some embodiments provided by this invention, generating adjustment instructions based on the target turbine's speed constraints and adjustable power constraints includes: determining a speed adjustment amount based on the target turbine's current speed and the speed constraints; determining a first allocation coefficient based on the speed adjustment amount; determining an adjustable power constraint based on the target turbine's current active power and rated power; determining a second allocation coefficient based on the adjustable power constraint; determining the target turbine's inertia frequency modulation power increase target based on the first and second allocation coefficients; and generating corresponding adjustment instructions based on the inertia frequency modulation power increase target. The speed constraint means that the wind turbine's speed adjustment should not exceed the operating speed range, which includes an upper and lower speed limit. The first allocation coefficient is determined based on the speed adjustment amount determined by the speed constraint. This allocation coefficient can be obtained by mapping according to existing preset rules or by obtaining it based on existing empirical models. Similarly, the adjustable power constraint also needs to be considered during the adjustment process, and this adjustable power also has an upper and lower limit. The second allocation coefficient is determined based on the adjustable power. The determination method can be arbitrarily chosen and can be the same as or different from the method used to determine the first allocation coefficient.

[0034] In some embodiments provided by this invention, determining the speed adjustment amount based on the current speed of the target unit and the speed constraint, and determining the first allocation coefficient based on the speed adjustment amount, includes: determining the upper or lower speed limit in the speed constraint as a reference speed based on the adjustment trend of the target unit; obtaining the difference between the current speed and the reference speed as the speed adjustment amount; determining the proportion of the speed adjustment amount of the target unit in the total speed adjustment amount of all target units participating in inertia frequency modulation; and using the proportion as the first allocation coefficient. This embodiment provides a method for determining the first allocation coefficient, using the proportion of the speed adjustment amount as the first allocation coefficient. An example of its calculation process is as follows: For a unit i with a power output of 1 liter, the margin ω of the speed constraint... up，i =ω 0,i -ω min , where ω 0,i ω represents the current motor speed of unit i. min The lower limit of the rotational speed of unit i participating in inertia frequency regulation, and the total rotational speed constraint margin ω of all units participating in inertia frequency regulation. up =Σω up,i Then the power-speed constraint allocation coefficient of unit i, i.e., the first allocation coefficient a up，i =ω up,i / ω up Similarly, for unit i with reduced power output, the margin ω for speed constraints... down，i =ω max -ω 0,i , where ω 0,i ω represents the current motor speed of unit i. max The upper limit of the rotational speed of unit i participating in inertia frequency regulation, and the total speed constraint margin ω of all units participating in inertia frequency regulation. down =Σω down,i Then the power reduction speed constraint allocation coefficient for unit i, i.e., the first allocation coefficient a, is... down，i =ω down,i / ω down .

[0035] In some optional embodiments provided by the present invention, an adjustable power constraint is determined based on the current active power and rated power of the target unit, and a second allocation coefficient is determined based on the adjustable power constraint. This includes: determining the upper or lower limit of the adjustable power constraint as a reference power based on the rated power determined by the adjustment trend of the target unit; obtaining the difference between the current active power and the reference power as the power adjustment amount; determining the proportion of the power adjustment amount of the target unit in the total power adjustment amount of all target units participating in inertia frequency regulation; and using the proportion as the second allocation coefficient. This embodiment provides a method for determining the second allocation coefficient, using the proportion of the power adjustment amount as the first allocation coefficient. An example of its calculation process is as follows: For unit i with increased power, the adjustable power margin C of unit i is...up，i =C max -p 0,i C max p is the rated capacity of the unit. 0,i The current active power of the unit, and the total adjustable power margin C of all units participating in inertia frequency regulation. up =∑C up，i Then the adjustable power margin allocation coefficient b of unit i is... up，i =C up,i / C up Similarly, for unit i with reduced power output, the adjustable power margin C of unit i is... down，i =p 0,i -C min C min p is the minimum operating capacity of the unit. 0,i The current active power of the unit, and the total adjustable power margin C of all units participating in inertia frequency regulation. down =ΣC down，i Then the adjustable power margin allocation coefficient b for unit i's power reduction down，i =C down,i / C down .

[0036] In some optional embodiments provided by the present invention, determining the inertia frequency modulation power increase target of the target unit based on the first allocation coefficient and the second allocation coefficient includes: determining corresponding adjustment weights for the first allocation coefficient and the second allocation coefficient; obtaining a comprehensive coefficient based on the first allocation coefficient, the second allocation coefficient, and the corresponding adjustment weights; and determining the inertia frequency modulation power increase target of the target unit based on the inertia frequency modulation active power adjustment amount and the comprehensive coefficient. The aforementioned embodiments obtain a comprehensive coefficient by combining the calculated first allocation coefficient and the second allocation coefficient to calculate the final power allocation. This embodiment provides an algorithm for the comprehensive coefficient to improve allocation efficiency. It also divides the problem into two cases: power-increasing units and power-decreasing units. For power-increasing unit i, the comprehensive coefficient is equal to (k1a...). up,i +k2b up,i ), where k1 and k2 are the weights of the motor speed and adjustable power margin for the power-up motor, and k1 + k2 = 1. Correspondingly, the inertia-based frequency-modulated power-up target for unit i is p. up,i =ΔP×(k1a) up，i +k2b up，i Meanwhile, due to capacity limitations of unit i, p up,i ≤C max -p 0,i For unit i with reduced power output, the comprehensive coefficient is equal to (k3a) down,i +k4b down,i), where k3 and k4 are the weights of the reduced power motor speed and adjustable power margin, and k3 + k4 = 1. Therefore, the inertia-based frequency regulation power reduction target for unit i is p. down,i =ΔP×(k3a) down，i +k4b down，i Simultaneously, due to the minimum operating capacity limitation of unit i, p down,i ≤p 0,i -C min .

[0037] In some embodiments provided by this invention, the real-time determination of the inertia frequency modulation active power adjustment includes: determining the inertia frequency modulation active power adjustment according to a set period; correspondingly, the generation command of the secondary dynamic compensation is superimposed on the adjustment command in the previous period. This embodiment provides a technical solution for monitoring the adjustment during the execution of the adjustment command by the target unit. The set period here can be set according to the power grid standard or according to the actual scenario. The set period can also be the calculation period or the sending period of the adjustment command. When secondary dynamic compensation exists, the two adjustment commands are superimposed according to the period, and there is a certain time shift between the superimposed periods.

[0038] In some embodiments provided by this invention, the secondary dynamic compensation employs a feedforward dual-PI closed-loop control method. This method includes adjustment using an inner current-loop PI regulator and an outer voltage-loop PI regulator. The feedforward dual-PI closed-loop control method is a control method that uses voltage and current closed loops respectively, offering advantages such as fast dynamic response and good control performance. Introducing feedforward compensation essentially uses open-loop control to compensate for measurable disturbance signals, thus not altering the characteristics of the control system. In this embodiment, the inner current-loop PI regulator includes a PI controller and a delay unit, with added current signal sampling delay and PWM device delay components. Its specific parameters are determined through the transfer function. Similarly, the outer voltage-loop PI regulator employs similar design steps. Considering the outer loop voltage signal sampling delay, the transfer function of the DC voltage controller is determined, and the corresponding closed-loop characteristic equations are used to determine the DC voltage controller PI parameters.

[0039] Figure 2 A schematic diagram illustrating the field-level inertia frequency modulation logic according to an embodiment of the present invention is shown, such as... Figure 2As shown in the diagram, the process includes: calculating ΔP based on the frequency change rate and identifying the units eligible for inertia-based frequency regulation, i.e., the aforementioned target units to be adjusted. The sign of ΔP determines whether power adjustment should be increased or decreased. During the adjustment process, the unit's power increase or decrease target is determined and issued based on speed constraints and adjustable power, and it is determined whether the overall frequency regulation requirements are met. If met, the regulation ends. If not, the overall single adjustment amount ΔP is calculated using a feedforward dual-PI converter and allocated and issued according to the aforementioned method until the requirements are met.

[0040] Based on the same inventive concept, the embodiments of the present invention also provide a wind farm inertia frequency regulation power distribution and closed-loop control device. Figure 3 A schematic diagram of a wind farm inertia-modulated frequency power distribution and closed-loop control device according to an embodiment of the present invention is shown. Figure 3 As shown, the device includes: an adjustment command module, used to determine the inertia frequency modulation active power adjustment amount and the target unit to be adjusted, and to generate an adjustment command based on the speed constraint and adjustable power constraint of the target unit; and an adjustment monitoring module, used to determine the inertia frequency modulation active power adjustment amount in real time during the execution of the adjustment command by the target unit; and to perform secondary dynamic compensation when the inertia frequency modulation active power adjustment amount is greater than a set threshold.

[0041] In some optional implementations, generating adjustment instructions based on the target unit's speed constraints and adjustable power constraints includes: determining a speed adjustment amount based on the target unit's current speed and the speed constraints; determining a first allocation coefficient based on the speed adjustment amount; determining an adjustable power constraint based on the target unit's current active power and rated power; determining a second allocation coefficient based on the adjustable power constraint; determining the target unit's inertia frequency modulation power increase target based on the first allocation coefficient and the second allocation coefficient; and generating corresponding adjustment instructions based on the inertia frequency modulation power increase target.

[0042] In some optional implementations, determining the speed adjustment amount based on the current speed of the target unit and the speed constraint, and determining the first allocation coefficient based on the speed adjustment amount, includes: determining the upper or lower speed limit in the speed constraint as a reference speed based on the adjustment trend of the target unit; obtaining the difference between the current speed and the reference speed as the speed adjustment amount; determining the proportion of the speed adjustment amount of the target unit in the total speed adjustment amount of all target units participating in inertia frequency regulation; and using the proportion as the first allocation coefficient.

[0043] In some optional implementations, determining an adjustable power constraint based on the current active power and rated power of the target unit, and determining a second allocation coefficient based on the adjustable power constraint, includes: determining the upper or lower limit of the adjustable power constraint as a reference power based on the rated power determined by the adjustment trend of the target unit; obtaining the difference between the current active power and the reference power as the power adjustment amount; determining the proportion of the power adjustment amount of the target unit in the total power adjustment amount of all target units participating in inertia frequency modulation; and using the proportion as the second allocation coefficient.

[0044] In some optional embodiments, determining the inertia frequency modulation power increase target of the target unit based on the first allocation coefficient and the second allocation coefficient includes: determining corresponding adjustment weights for the first allocation coefficient and the second allocation coefficient; obtaining a comprehensive coefficient based on the first allocation coefficient, the second allocation coefficient and the corresponding adjustment weights; and determining the inertia frequency modulation power increase target of the target unit based on the inertia frequency modulation active power adjustment amount and the comprehensive coefficient.

[0045] In some optional implementations, the real-time determination of the inertia frequency modulation active power adjustment includes: determining the inertia frequency modulation active power adjustment over a set period; correspondingly, the generation instruction of the secondary dynamic compensation is superimposed on the adjustment instruction in the previous period.

[0046] In some optional implementations, the secondary dynamic compensation employs a feedforward dual-PI closed-loop control method; the feedforward dual-PI closed-loop control method includes: adjustment using an inner current PI regulator and adjustment using an outer voltage PI regulator.

[0047] The specific limitations of each functional module in the aforementioned wind farm inertia frequency regulation power distribution and closed-loop control device can be found in the limitations of the wind farm inertia frequency regulation power distribution and closed-loop control method described above, and will not be repeated here. Each module in the aforementioned device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in hardware or independently of the processor in a computer device, or stored in software in the memory of a computer device, so that the processor can call and execute the corresponding operations of each module.

[0048] In some embodiments of the present invention, a wind farm inertia frequency regulation power allocation and closed-loop control device is also provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the aforementioned wind farm inertia frequency regulation power allocation and closed-loop control method. The processor here has numerical calculation and logical operation capabilities, and at least has a central processing unit (CPU) with data processing capabilities, random access memory (RAM), read-only memory (ROM), multiple I / O ports, and an interrupt system. The processor contains a kernel, which retrieves the corresponding program unit from the memory. One or more kernels can be configured, and the aforementioned method can be implemented by adjusting the kernel parameters. The memory may include non-permanent memory in computer-readable media, random access memory (RAM), and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. The memory includes at least one memory chip.

[0049] In one embodiment of the present invention, a computer-readable storage medium is also provided, wherein the storage medium stores instructions that, when executed on a computer, cause the processor to be configured to perform the above-described wind farm inertia frequency modulation power allocation and closed-loop control method.

[0050] In one embodiment of the present invention, a computer program product is provided, including a computer program that, when executed by a processor, implements the above-described wind farm inertia frequency modulation power allocation and closed-loop control method.

[0051] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0052] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxesFigure 1 A device that provides the functions specified in one or more boxes.

[0053] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0054] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0055] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0056] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0057] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0058] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0059] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for frequency-modulated power distribution and closed-loop control of wind farm inertia, characterized in that, The method includes: The process involves determining the active power adjustment amount for inertia frequency regulation and the target generating unit to be adjusted, and generating adjustment commands based on the speed constraints and adjustable power constraints of the target generating unit. Determining the active power adjustment amount for inertia frequency regulation includes: ； in, The station's inertial time constant; The system's rated frequency; For grid connection frequency; The rated capacity of the station, This refers to the active power adjustment amount for inertia frequency modulation. During the execution of the adjustment command by the target unit, the adjustment amount of inertia frequency modulation active power is determined in real time. When the adjustment amount of inertia frequency modulation active power exceeds a set threshold, secondary dynamic compensation is performed. The adjustment command is generated based on the target unit's speed constraints and adjustable power constraints, including: The speed adjustment amount is determined based on the current speed of the target unit and the speed constraint, and the first allocation coefficient is determined based on the speed adjustment amount; The adjustable power constraint is determined based on the current active power and rated power of the target unit, and the second allocation coefficient is determined based on the adjustable power constraint. The inertia frequency modulation power target of the target unit is determined based on the first allocation coefficient and the second allocation coefficient; Generate corresponding adjustment commands based on the inertia-based frequency modulation power target; determine the speed adjustment amount based on the current speed of the target unit and the speed constraint; and determine the first allocation coefficient based on the speed adjustment amount, including: The upper or lower speed limit in the speed constraint is determined as the reference speed based on the adjustment trend of the target unit. The difference between the current rotational speed and the reference rotational speed is obtained as the rotational speed adjustment amount; Determine the proportion of the target unit's speed adjustment amount in the total speed adjustment amount of all target units participating in inertia frequency regulation; The first allocation coefficient is used as the ratio; an adjustable power constraint is determined based on the current active power and rated power of the target unit, and a second allocation coefficient is determined based on the adjustable power constraint, including: Based on the adjustment trend of the target unit, the rated power is determined, and the upper or lower limit of the adjustable power constraint is used as the reference power. The difference between the current active power and the reference power is obtained as the power adjustment amount; Determine the proportion of the power adjustment amount of the target unit in the total power adjustment amount of all target units participating in inertia frequency modulation; The aforementioned ratio shall be used as the second allocation coefficient.

2. The method according to claim 1, characterized in that, Determining the target inertia frequency modulation power of the target unit based on the first allocation coefficient and the second allocation coefficient includes: Determine the corresponding adjustment weights for the first allocation coefficient and the second allocation coefficient; The comprehensive coefficient is obtained based on the first allocation coefficient, the second allocation coefficient, and the corresponding adjustment weight; The inertia frequency regulation power target of the target unit is determined based on the inertia frequency regulation active power adjustment amount and the comprehensive coefficient.

3. The method according to claim 1, characterized in that, The real-time determination of the active power adjustment amount for inertia frequency modulation includes: The active power adjustment amount for inertia frequency modulation is determined by a set period. Correspondingly, the generation instruction for the secondary dynamic compensation is superimposed on the adjustment instruction in the previous cycle.

4. The method according to claim 1, characterized in that, The secondary dynamic compensation adopts a feedforward dual-PI closed-loop control method. The feedforward dual PI closed-loop control method includes: using an inner current PI regulator for adjustment and using an outer voltage PI regulator for adjustment.

5. A wind farm inertia frequency modulation power distribution and closed-loop control device, characterized in that, The device includes: The adjustment command module is used to determine the adjustment amount of the inertia frequency modulation active power and the target unit to be adjusted, and to generate adjustment commands based on the speed constraints and adjustable power constraints of the target unit; wherein, determining the adjustment amount of the inertia frequency modulation active power includes: ； in, The station's inertial time constant; The system's rated frequency; For grid connection frequency; The rated capacity of the station, This refers to the active power adjustment amount for inertia frequency modulation. as well as The monitoring module is used to determine the inertial frequency modulation active power adjustment amount in real time during the execution of the adjustment command by the target unit; and to perform secondary dynamic compensation when the inertial frequency modulation active power adjustment amount is greater than a set threshold. Adjustment commands are generated based on the target unit's speed constraints and adjustable power constraints, including: The speed adjustment amount is determined based on the current speed of the target unit and the speed constraint, and the first allocation coefficient is determined based on the speed adjustment amount; The adjustable power constraint is determined based on the current active power and rated power of the target unit, and the second allocation coefficient is determined based on the adjustable power constraint. The inertia frequency modulation power target of the target unit is determined based on the first allocation coefficient and the second allocation coefficient; Generate corresponding adjustment commands based on the inertia-based frequency modulation power target; determine the speed adjustment amount based on the current speed of the target unit and the speed constraint; and determine the first allocation coefficient based on the speed adjustment amount, including: The upper or lower speed limit in the speed constraint is determined as the reference speed based on the adjustment trend of the target unit. The difference between the current rotational speed and the reference rotational speed is obtained as the rotational speed adjustment amount; Determine the proportion of the target unit's speed adjustment amount in the total speed adjustment amount of all target units participating in inertia frequency regulation; The first allocation coefficient is used as the ratio; an adjustable power constraint is determined based on the current active power and rated power of the target unit, and a second allocation coefficient is determined based on the adjustable power constraint, including: Based on the adjustment trend of the target unit, the rated power is determined, and the upper or lower limit of the adjustable power constraint is used as the reference power. The difference between the current active power and the reference power is obtained as the power adjustment amount; Determine the proportion of the power adjustment amount of the target unit in the total power adjustment amount of all target units participating in inertia frequency modulation; The aforementioned ratio shall be used as the second allocation coefficient.

6. A wind farm inertia frequency modulation power distribution and closed-loop control device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the wind farm inertia frequency modulation power distribution and closed-loop control method according to any one of claims 1 to 4.

7. A computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the steps of the wind farm inertia frequency modulation power allocation and closed-loop control method according to any one of claims 1 to 4.

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