A control method for calling fan energy and a fan interface device

Abstract

The application discloses a control method for calling fan energy and a fan interface device, and belongs to the technical field of flexible direct-current power transmission. The control method obtains the upper limit value and the lower limit value of the power of a wind farm from a flexible direct-current control protection system, determines the total power value of the wind farm based on the terminal power of each fan, and then generates the power value to be consumed by the wind farm and the power value to be supported by the wind farm, so that when the power value to be consumed is greater than zero, at least part of the fans are controlled to be put into energy consumption to reduce the actual power injected into the converter station, so that the sum of the terminal power of the fans put into energy consumption is greater than or equal to the power value to be consumed by the wind farm; when the power value to be supported by the wind farm is greater than zero, at least part of the fans are controlled to increase the power to increase the power injected into the converter station, so that the sum of the power of the fans with increased power is greater than or equal to the power value to be supported by the wind farm. Therefore, the control method for calling fan energy can meet the adjustment requirements of power surplus and power shortage.

Description

Technical Field

[0001] This application relates to the field of flexible DC power transmission technology, specifically to a control method for utilizing wind turbine energy and a wind turbine interface device. Background Technology

[0002] Flexible DC transmission technology is an important means for large-scale offshore wind power grid connection and long-distance power transmission. In the offshore wind flexible DC transmission system, the sending-end converter station is connected to the wind farm through an AC bus, and the electricity generated by the wind farm is transmitted to the receiving-end grid through DC lines.

[0003] However, when power transmission from the sending-end converter station is obstructed due to faults in the receiving-end grid, the continuously injected power from the wind farm will create a surplus. This necessitates utilizing the energy dissipation capacity of the wind turbines to reduce the power output to the converter station. Conversely, when the receiving-end grid experiences a power deficit requiring emergency support, the power support capacity of the wind turbines needs to be utilized to increase the output power. Therefore, a wind turbine energy control method that can address both power surplus and power deficit regulation needs is required. Summary of the Invention

[0004] This application provides a control method and a fan interface device for requesting fan energy, aiming to provide a control method for requesting fan energy that can take into account both power surplus and power deficit adjustment needs.

[0005] In a first aspect, embodiments of this application provide a control method for accessing wind turbine energy, the control method comprising: Wind farm parameters are obtained from a flexible DC control and protection system, including an upper limit value and a lower limit value of wind farm power. Obtain the turbine parameters for each wind turbine from the wind farm; the turbine parameters include the terminal power. The total power of the wind farm is determined based on the terminal power of all wind turbines. The power to be consumed by the wind farm is determined based on the total power value and the upper limit of the wind farm power. Based on the total power value of the wind farm and the lower limit of the wind farm power, determine the power value that the wind farm needs to support; When the power to be consumed by the wind farm is greater than zero, at least some wind turbines are controlled to consume energy so that the sum of the terminal power of the wind turbines that consume energy is greater than or equal to the power to be consumed by the wind farm. When the power value to be supported by the wind farm is greater than zero, control the power of at least some wind turbines to increase so that the sum of the increased power of the wind turbines is greater than or equal to the power value to be supported by the wind farm.

[0006] In some embodiments, the fan parameters also include the available time for internal energy consumption; Controlling the energy consumption of at least a portion of the wind turbines, including: Based on the energy consumption value corresponding to each wind turbine, the wind turbines are controlled to consume energy in descending order of energy consumption value, so that the sum of the terminal power of the wind turbines that consume energy is greater than or equal to the power consumption value of the wind farm. The energy consumption value is determined based on the product of the terminal power and the available time for internal energy consumption.

[0007] In some embodiments, controlling at least a portion of the wind turbines to consume energy further includes: Before controlling the wind turbines to consume energy in descending order of their consumable energy values, the consumable energy value corresponding to each wind turbine is locked. Once the sum of the terminal power of the wind turbines that are put into operation is greater than or equal to the power value to be consumed by the wind farm, if the power value to be consumed by the wind farm is less than or equal to zero and the duration exceeds the first preset time, the lock-up of the energy value to be consumed for each wind turbine is released.

[0008] In some embodiments, the wind turbine parameters also include the maximum output power and the maximum power duration; Controlling the power increase of at least some of the wind turbines, including: Based on the supportable energy value of each wind turbine, the wind turbine boosting power is controlled in descending order of supportable energy value so that the sum of the boosting power of the wind turbines is greater than or equal to the power value to be supported by the wind farm. The supported energy value is determined based on the product of the maximum output power and the maximum power duration.

[0009] In some embodiments, controlling at least a portion of the wind turbines to increase their power further includes: Before controlling the power increase of the wind turbines in descending order of their supportable energy values, the supportable energy value of each wind turbine is locked. Once the sum of the boosted power of the wind turbines is greater than or equal to the power value to be supported by the wind farm, if the power value to be supported by the wind farm is less than or equal to zero and the duration exceeds the second preset time, the lock-in of the energy value to be supported for each wind turbine is released.

[0010] In some embodiments, wind farm parameters also include real-time power on the wind farm side; After controlling at least some of the wind turbines to be put into operation for energy consumption, such that the sum of the terminal power of the wind turbines put into operation is greater than or equal to the power to be consumed by the wind farm, the control method further includes: If the real-time power of the wind farm is greater than the upper limit of the wind farm power, and the duration exceeds the preset consumption waiting time, then at least some of the wind turbines that have not been put into energy consumption will be put into energy consumption so that the real-time power of the wind farm is less than or equal to the upper limit of the wind farm power.

[0011] In some embodiments, after controlling at least a portion of the wind turbines to increase their power so that the sum of the increased power of the wind turbines is greater than or equal to the power value to be supported by the wind farm, the control method further includes: If the real-time power of the wind farm is less than the lower limit of the wind farm power and the duration exceeds the preset support waiting time, then at least a portion of the wind turbines whose power has not been increased will have their power increased so that the real-time power of the wind farm is greater than or equal to the lower limit of the wind farm power.

[0012] In some embodiments, the control method further includes: The wind turbines in the wind farm are divided into wind turbine groups; When the power to be consumed by the wind farm is greater than zero, at least one wind turbine is controlled to consume energy so that the sum of the terminal power of the wind turbines that consume energy is greater than or equal to the power to be consumed by the wind farm. When the power value to be supported by the wind farm is greater than zero, control at least one wind turbine to increase its power so that the sum of the increased power of the wind turbines is greater than or equal to the power value to be supported by the wind farm.

[0013] Secondly, embodiments of this application also provide a wind turbine interface device for accessing wind turbine energy, the wind turbine interface device comprising: A DC system communication module is used to communicate and exchange data with a flexible DC control and protection system. The wind turbine converter communication module is used to communicate and exchange data with each wind turbine in the wind farm; The energy consumption module is used to determine the power value to be consumed by the wind farm based on the total power value and the upper limit of the wind farm power; and when the power value to be consumed by the wind farm is greater than zero, it controls at least some wind turbines to consume energy so that the sum of the terminal power of the wind turbines that consume energy is greater than or equal to the power value to be consumed by the wind farm. The support energy dispatch module is used to determine the power value to be supported for the wind farm based on the total power value and the lower limit of the wind farm power; and when the power value to be supported for the wind farm is greater than zero, it controls at least some wind turbines to increase their power so that the sum of the increased power of the wind turbines is greater than or equal to the power value to be supported for the wind farm.

[0014] In some embodiments, the wind turbine interface device and the flexible DC control and protection system communicate in a cross-redundant manner; The wind turbine interface device communicates with each wind turbine unit via a point-to-point ring network, and the wind turbine converters in each wind turbine unit communicate in series via a daisy-chain method.

[0015] This application provides a method for controlling the use of wind turbine energy. It obtains the upper and lower power limits of the wind farm from a flexible DC control and protection system, determines the total power value of the wind farm based on the terminal power of each wind turbine, and then generates a power value to be consumed and a power value to be supported. When the power value to be consumed is greater than zero, at least some wind turbines are controlled to consume energy to reduce the actual power injected into the converter station, so that the sum of the terminal power of the turbines consuming energy is greater than or equal to the power value to be consumed. When the power value to be supported is less than zero, at least some wind turbines are controlled to increase their power to increase the power injected into the converter station, so that the sum of the increased power of the turbines is greater than or equal to the power value to be supported. Therefore, this application provides a method for controlling the use of wind turbine energy that can accommodate both power surplus and power deficit adjustment needs, improving the power coordination capability between the converter station and the wind farm.

[0016] This application also provides a wind turbine interface device for calling wind turbine energy. The wind turbine interface device is used to execute the control method for calling wind turbine energy in the above embodiments. Therefore, the wind turbine interface device can have all the technical features and beneficial effects of the control method for calling wind turbine energy, which will not be repeated here. Attached Figure Description

[0017] Figure 1 A schematic diagram of a control method for accessing wind turbine energy and a wind turbine interface device provided in this application embodiment; Figure 2 A wiring diagram of a wind turbine interface device, a flexible DC control and protection system, and a wind turbine converter is provided for embodiments of this application. Figure 3 This is a flowchart illustrating a control method for mobilizing wind turbine energy, provided in an embodiment of this application. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0020] The use of "applies to" or "configured to" in this application implies open and inclusive language, which does not exclude the applicability to or configuration to devices performing additional tasks or steps. Additionally, the use of "based on" implies openness and inclusivity, because processes, steps, calculations, or other actions "based on" one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0021] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0022] The development of flexible DC transmission technology has provided a stable and efficient power transmission solution for offshore wind power, promoting the advancement of offshore wind power into the deep sea.

[0023] When offshore wind-powered flexible DC transmission systems are in operation, on the one hand, if an AC fault occurs in the onshore power grid, the offshore wind farm will continue to operate at its generating capacity. This may result in the offshore output power exceeding the power that the onshore power grid can transmit under fault conditions, inevitably leading to overvoltage tripping of equipment due to excessive DC surplus energy. Generally, DC energy-absorbing equipment is required to absorb this surplus energy in such situations. On the other hand, when the onshore power grid needs emergency power support, the power transmitted by the offshore wind-powered flexible DC transmission system is entirely determined by the real-time generating capacity of the wind farm. The energy stored in the flexible DC submodule capacitors is very limited, and there is a lack of direct medium for emergency support from the wind farm. The existing communication channels between the flexible DC system and the wind farm make rapid support difficult, and slow feedback also means that changes in wind turbine power do not provide sufficient inertial support to the grid. Therefore, a wind turbine energy control method that can balance the needs of both power surplus and power deficit regulation is needed.

[0024] Some examples provide methods for invoking wind turbine energy consumption based on physical communication devices, but these only focus on adjustment strategies at the flexible DC control and protection level to address power surplus, without mentioning specific invoking methods for the wind turbine energy consumption interface devices. Other examples mention a specific method for invoking wind turbine energy consumption, which is complex in implementation by using remaining call duration as a consumption capacity parameter and configuring weighting coefficients; furthermore, it does not propose invoking strategies when the AC grid requires power support.

[0025] In view of this, the present application provides a control method for calling wind turbine energy and a wind turbine interface device, which solves at least one of the above-mentioned technical problems.

[0026] Please see Figure 1 , Figure 1 This is a schematic diagram of a control method for calling up wind turbine energy and a wind turbine interface device provided in an embodiment of this application.

[0027] This application also provides a wind turbine interface device for accessing wind turbine energy, which is applied to a DC transmission system connected to a wind farm. The DC transmission system is equipped with the wind turbine interface device at the sending-end converter station. The wind turbine interface device is communicatively connected to the flexible DC control and protection system and the converters of each wind turbine in the wind farm. The wind turbine interface device is used to perform energy access control for each wind turbine in the wind farm.

[0028] This application embodiment also provides a wind turbine interface device for calling wind turbine energy. The wind turbine interface device includes: a DC system communication module, a wind turbine converter communication module, a consumed energy calling module, and a supporting energy calling module. The DC system communication module is used to communicate and exchange data with a flexible DC control and protection system, and can obtain wind farm parameters from the flexible DC control and protection system. The wind farm parameters include the upper limit value and the lower limit value of the wind farm power. The wind turbine converter communication module is used to communicate and exchange data with each wind turbine in the wind farm, and can obtain the wind turbine parameters of each wind turbine from the wind farm. The wind turbine parameters include the turbine terminal power. The quantity dispatch module is used to determine the power value to be consumed by the wind farm based on the total power value and the upper limit of the wind farm power; and when the power value to be consumed by the wind farm is greater than zero, it controls at least some wind turbines to consume energy so that the sum of the turbine terminal power of the wind turbines that consume energy is greater than or equal to the power value to be consumed by the wind farm. The support energy dispatch module is used to determine the power value to be supported by the wind farm based on the total power value and the lower limit of the wind farm power; and when the power value to be supported by the wind farm is greater than zero, it controls at least some wind turbines to increase their power so that the sum of the increased power of the wind turbines that increase their power is greater than or equal to the power value to be supported by the wind farm.

[0029] Specifically, the DC system communication module is used to communicate with the flexible DC control and protection system, and can obtain wind farm parameters from the flexible DC control and protection system. The wind farm parameters include the upper limit value of wind farm power Pmax and the lower limit value of wind farm power Pmin, and may also include the real-time power Ps on the wind farm side.

[0030] The wind turbine converter communication module is used to communicate with each wind turbine converter in the wind farm, and can obtain the parameters of each wind turbine from the converters. These parameters include the terminal power Pwind, and may also include the internal energy consumption availability time Tchop, the maximum output power Pwmax, and the maximum power consumption duration Twmax. The module is also used to send energy consumption activation commands and power boost commands to each wind turbine converter.

[0031] The energy consumption dispatch module determines the power consumption value Pd (Pd=Pw-Pmax) of the wind farm based on the total power value and the upper limit of the wind farm's power. When the power consumption value is greater than zero, it sends energy consumption activation commands to at least some wind turbines through the wind turbine converter communication module, controlling at least some wind turbines to activate energy consumption until the sum of the terminal power of the activated wind turbines is greater than or equal to the power consumption value. The specific process will be described in detail in the control method section and will not be repeated here.

[0032] The supporting energy dispatch module determines the power value Pu (Pu = Pmin - Pw) to be supported for the wind farm based on the total power value and the lower limit of the wind farm power. When the power value to be supported is greater than zero, it sends power boosting commands to at least some wind turbines through the wind turbine converter communication module, controlling at least some wind turbines to increase their power until the sum of the increased power of the wind turbines is greater than or equal to the power value to be supported. The specific process will be described in detail in the control method section and will not be repeated here.

[0033] It should be noted that the aforementioned energy consumption and support energy requisition modules can be integrated into the processing module. This processing module is connected to both the DC system communication module and the wind turbine converter communication module. It obtains wind farm parameters from the DC system communication module, such as the upper and lower limits of wind farm power; it also obtains wind turbine parameters from the wind turbine converter communication module, such as the terminal power of each turbine. Based on the obtained data, it calculates and determines the total power value of the wind farm, and then executes the energy consumption and support energy requisition functions. The processing module can be a general-purpose processor, digital signal processor, application-specific integrated circuit, field-programmable gate array, or other programmable logic device, or a combination of multiple processors; this application does not limit this. Please refer to [link to relevant documentation]. Figure 2 , Figure 2 This is a wiring diagram of a wind turbine interface device, a flexible DC control and protection system, and a wind turbine converter, provided as an embodiment of this application.

[0034] In some embodiments, the wind turbine interface device and the flexible DC control and protection system communicate in a cross-redundant manner.

[0035] Specifically, cross-redundancy refers to setting up all point-to-point communication links between redundant wind turbine interface devices and redundant flexible DC control and protection systems. This means that any wind turbine interface device can communicate with any flexible DC control and protection system. Cross-redundancy improves the reliability of communication between the wind turbine interface device and the flexible DC control and protection system, avoiding the risk that a single communication link failure, along with other devices, would prevent the wind turbine interface device from receiving the upper and lower power limits of the wind farm.

[0036] In some embodiments, the wind turbines in the wind farm are pre-divided into multiple turbine groups, and the wind turbine interface device communicates with each turbine group in a point-to-point ring network manner. The wind turbine converters in each turbine group communicate in series in a daisy-chain manner.

[0037] It should be noted that wind turbines in a wind farm can be divided into multiple turbine units according to turbine type, collection lines, or busbar area. For example... Figure 2 As shown, taking the distribution of power collection lines as an example, each power collection line connects to one wind turbine unit. The number of wind turbines in each wind turbine unit can be the same or different. The wind turbine converters within the same wind turbine unit are connected in series in a daisy-chain manner, that is, a communication line is led out from the previous wind turbine converter to the next wind turbine converter, forming a chain structure, and finally connected back to the corresponding communication port of the wind turbine interface device to form a ring network. The wind turbine interface device forms an independent ring network with each wind turbine unit, and each wind turbine unit is independent of each other and does not affect each other. Data is transmitted along the ring network. When a break occurs at a point in the ring network of a certain wind turbine unit, the data can be transmitted in the other direction of the ring network to maintain uninterrupted communication within that wind turbine unit.

[0038] It should also be noted that by dividing the wind turbines into turbine groups, the wind turbine interface device can control the turbine group as a unit. Specifically, when it is necessary to control the energy consumption or increase the power of a wind turbine, the wind turbine interface device sends a control command to the selected turbine group as a whole. The converters of each turbine in the turbine group will then act uniformly according to the received command. This will be described in detail in the control method section and will not be repeated here. In this way, for a large-scale wind farm containing hundreds of wind turbines, the wind turbine interface device only needs to send commands to a few turbine groups to complete the control of all the wind turbines in the farm, avoiding communication with each wind turbine individually and effectively reducing the communication burden between the wind turbine interface device and each wind turbine. At the same time, the method of dividing the wind turbine groups according to the collection lines matches the actual electrical topology of the wind farm, and the wind turbines in each turbine group are physically close to each other, which facilitates the engineering implementation and maintenance on the wind farm side.

[0039] Through the above technical solution, the wind turbine interface device provided in this application embodiment, by setting up a DC system communication module and a wind turbine converter communication module, connects to the flexible DC control and protection system and each wind turbine converter in the wind farm respectively. The device is equipped with a processing module to perform the calculation of the total power of the wind farm, the judgment of the power to be consumed and the power to be supported, and the issuance of control commands. This enables the device to independently complete the energy dispatch decision and execution of each wind turbine in the wind farm, thereby establishing a direct energy collaborative control channel between the converter station and the wind farm. It can be used to dispatch wind turbine energy consumption when there is a power surplus, and to dispatch wind turbine power support when there is a power deficit.

[0040] The following provides a detailed description of the control method for accessing wind turbine energy provided in the embodiments of this application. This control method can be executed by the aforementioned wind turbine interface device.

[0041] Please see Figure 3 , Figure 3 This is a flowchart illustrating a control method for mobilizing wind turbine energy, provided in an embodiment of this application.

[0042] This application provides a control method for utilizing wind turbine energy, the control method including: S1. Obtain wind farm parameters from the flexible DC control and protection system, wherein the wind farm parameters include the upper limit value of wind farm power and the lower limit value of wind farm power.

[0043] Specifically, the wind turbine interface device obtains wind farm parameters from the flexible DC control and protection system. These parameters include an upper power limit (Pmax) and a lower power limit (Pmin). The upper and lower power limits are generated by the flexible DC control and protection system based on the operational requirements of the DC transmission system and then sent to the wind turbine interface device. The upper power limit represents the maximum power the converter station is allowed to receive from the wind farm, while the lower power limit represents the minimum power the converter station desires to receive from the wind farm.

[0044] S2. Obtain the turbine parameters for each wind turbine from the wind farm. The turbine parameters include the turbine terminal power.

[0045] Specifically, the wind turbine interface device obtains the turbine parameters for each wind turbine from the wind farm. These parameters include at least the turbine terminal power (Pwind) of each turbine. Pwind refers to the active power input to the turbine side of the turbine converter, i.e., the output power of the turbine itself. The wind turbine interface device can obtain these turbine parameters through communication links with each turbine converter. These parameters can be measured and transmitted in real time by each turbine converter.

[0046] S3. Determine the total power value of the wind farm based on the terminal power of all wind turbines.

[0047] Specifically, the wind turbine interface device determines the total power value Pw of the wind farm based on the terminal power of all wind turbines. The total power value of the wind farm is the sum of the terminal power of all wind turbines, i.e., Pw = ∑1 n Pwind, where n represents the total number of wind turbines in the wind farm.

[0048] S4. Based on the total power value of the wind farm and the upper limit of the wind farm power, determine the power value to be consumed by the wind farm.

[0049] Specifically, the power to be consumed by the wind farm, Pd, is the difference between the total power of the wind farm, Pw, and the upper limit of the wind farm's power, Pmax, i.e., Pd = Pw - Pmax. When the total power of the wind farm, Pw, is greater than the upper limit of the wind farm's power, Pmax, the power to be consumed by the wind farm, Pd, is greater than zero, indicating that the power injected into the converter station by the wind farm exceeds the upper limit that the converter station can receive, and there is a power surplus.

[0050] S5. Based on the total power value of the wind farm and the lower limit of the wind farm power, determine the power value to be supported by the wind farm.

[0051] Specifically, the power demand value Pu of the wind farm is the difference between the lower limit of wind farm power Pmin and the total power value Pw of the wind farm, i.e., Pu = Pmin - Pw. When the total power value Pw of the wind farm is less than the lower limit of wind farm power Pmin, the power demand value Pu of the wind farm is greater than zero, indicating that the power injected by the wind farm into the converter station is lower than the lower limit of the converter station's demand, and there is a power shortage.

[0052] S6. When the power to be consumed by the wind farm is greater than zero, control at least some wind turbines to be put into power consumption so that the sum of the terminal power of the wind turbines put into power consumption is greater than or equal to the power to be consumed by the wind farm.

[0053] Specifically, when the wind farm's power consumption value Pd is greater than zero, the wind turbine interface device controls at least some wind turbines to engage in power consumption, ensuring that the sum of the terminal power of the engaged wind turbines is greater than or equal to the wind farm's power consumption value Pd. In other words, it satisfies ∑1 m Pwind ≥ Pd, where m is the number of wind turbines in operation that consume energy. Activating energy consumption refers to the wind turbine converter engaging its internal DC chopper, which dissipates the electrical energy generated by the turbine as heat energy through a heat-consuming resistor. At this time, the turbine's terminal output power remains unchanged, while the grid-end output power becomes zero. By controlling the activation of some wind turbines for energy consumption, the total power output from the wind farm to the converter station decreases. When the sum of the terminal power of the turbines in operation for energy consumption reaches the value to be consumed, the turbines not in operation for energy consumption continue to generate electricity normally, and the total power output from the wind farm to the converter station drops below the wind farm's power limit. In other words, the total terminal power of the turbines not in operation for energy consumption is less than or equal to the wind farm's power limit Pmax.

[0054] S7. When the power value to be supported by the wind farm is greater than zero, control at least some of the wind turbines to increase their power so that the sum of the increased power of the wind turbines is greater than or equal to the power value to be supported by the wind farm.

[0055] Specifically, when the power value Pu to be supported by the wind farm is greater than zero, the wind turbine interface device controls at least some of the wind turbines to increase their power, and the sum of the increased power of the wind turbines is greater than or equal to the power value to be supported by the wind farm, that is, satisfying ∑1 k (Pwmax - Pwind) ≥ Pu, where k is the number of wind turbines with increased power. Increased power refers to the wind turbine converter boosting the output power to the maximum output power Pwmax. By controlling the increased power of some wind turbines, the total power output from the wind farm to the converter station increases. When the sum of the increased power of the wind turbines reaches the required supported power value, the total power output from the wind farm to the converter station rises above the lower limit of the wind farm's power, that is, ∑1 k Pwmax+∑ k+1 n Pwind ≥ Pmin.

[0056] It should be noted that the data used in the above steps of controlling the energy consumption of at least some wind turbines and controlling the power increase of at least some wind turbines are all data stored before the triggering time. Specifically, the wind turbine interface device acquires data from the flexible DC control and protection system and the wind turbine converter at a fixed sampling period, and calculates the wind farm's power consumption value, wind farm's power support value, etc., in each period. When it is determined that the wind farm's power consumption value or wind farm's power support value is greater than zero, the wind turbine interface device uses the data that has been calculated and stored before the triggering time. This data can be understood as the value acquired and stored in the previous sampling period. That is to say, when controlling the energy consumption of at least some wind turbines, the wind farm's power consumption value Pd, the turbine terminal power Pwind, and the wind farm's upper power limit value Pmax are the values ​​acquired and stored in the previous sampling period. When controlling the power increase of at least some wind turbines, the wind farm's power support value Pu, turbine terminal power Pwind, maximum output power Pwmax, and wind farm's lower power limit value Pmin are also the values ​​acquired and stored in the previous sampling period. This ensures that the power difference that needs to be eliminated during the entire call process remains constant, preventing the control target from constantly drifting due to real-time changes.

[0057] It is important to understand that the aforementioned energy consumption input control and power boost control are two independent control branches, corresponding to power surplus scenarios and power deficit scenarios, respectively. The wind turbine interface device monitors the power consumption and power support values ​​of the wind farm in real time and executes the corresponding control branches based on triggering conditions.

[0058] In this embodiment, the upper and lower power limits of the wind farm are obtained from the flexible DC control and protection system, and the total power value of the wind farm is determined based on the terminal power of each wind turbine. This generates power values ​​to be consumed and power values ​​to be supported, allowing for the simultaneous setting of independent triggering conditions and corresponding wind turbine control actions for both power surplus and power deficit scenarios within the same control framework. This enables bidirectional regulation of the wind farm's output power. Whether the DC transmission system faces power transmission obstruction due to a fault or requires emergency power support, the system can respond to demands by utilizing the energy consumption or power support capabilities of the distributed wind turbines themselves. This expands the scope of scenarios where wind turbines can participate in DC transmission system power regulation and improves the power coordination capability between the converter station and the wind farm.

[0059] In some embodiments, the wind turbine parameters further include internal energy consumption availability time; controlling at least a portion of the wind turbine to consume energy includes: S61. Based on the energy consumption value corresponding to each wind turbine, control the wind turbines to consume energy in descending order of energy consumption value, so that the sum of the terminal power of the wind turbines that consume energy is greater than or equal to the power value to be consumed by the wind farm; wherein, the energy consumption value is determined based on the product of the terminal power and the available time for internal energy consumption.

[0060] The wind turbine parameters also include the internal energy consumption availability time (Tchop) for each turbine. Internal energy consumption availability time refers to the duration for which the DC chopper of the wind turbine converter can remain operational without exceeding its heat dissipation capacity. The wind turbine converter is equipped with an energy-dissipating resistor. When the DC chopper is engaged, electrical energy is converted into heat energy and dissipated through the energy-dissipating resistor. The heat dissipation capacity of the energy-dissipating resistor limits its continuous operational time. The internal energy consumption availability time is determined in real-time by the wind turbine converter based on its current heat dissipation status and sent to the wind turbine interface device. Its value reflects the margin of time the wind turbine can continuously consume energy under current operating conditions.

[0061] When controlling the energy consumption of some wind turbines, the wind turbine interface device can adopt a sorting and selection method based on the energy consumption value. Specifically, the wind turbine interface device determines the energy consumption value Ed corresponding to each wind turbine based on the product of the turbine terminal power Pwind and the internal energy consumption available time Tchop, i.e., Ed = Pwind × Tchop. The energy consumption value represents the total amount of energy that the wind turbine can consume if it is put into operation under the current operating conditions.

[0062] The wind turbine interface device sorts the energy consumption values ​​of each wind turbine in descending order. When selecting a wind turbine to be put into operation, any of the following methods can be used.

[0063] In one approach, the wind turbine interface device sequentially controls the power consumption of each wind turbine according to a set order. After each wind turbine is put into operation, the terminal power of the wind turbines that have been put into operation is accumulated and compared with the power to be consumed value. If the accumulated value is less than the power to be consumed value, the next wind turbine is put into operation. If the accumulated value is greater than or equal to the power to be consumed value, the operation is stopped.

[0064] In another approach, the wind turbine interface device accumulates the terminal power of each wind turbine in sequence from front to back. When the accumulated value is greater than or equal to the power to be consumed for the first time, all the wind turbines involved in the accumulation are selected at once, and energy consumption input instructions are issued to each of the selected wind turbines simultaneously.

[0065] Understandably, by selecting wind turbines to be put into operation in descending order of energy consumption, the required power reduction can be achieved with fewer wind turbines being put into operation, reducing the number of communication interactions between the wind turbine interface device and each wind turbine, and shortening the call time.

[0066] In some embodiments, controlling at least a portion of the wind turbines to consume energy further includes: S62. Before controlling the operation of the wind turbines in descending order of energy consumption, lock the energy consumption value corresponding to each wind turbine.

[0067] Specifically, the wind turbine interface device acquires data from the flexible DC control and protection system and the wind turbine converter at a fixed sampling period. Within each period, it calculates the energy consumption value and ranking of each wind turbine, and then stores the calculation results. When the trigger condition that the wind farm's power consumption value is greater than zero is met, the wind turbine interface device immediately latches the energy consumption value and ranking of each wind turbine stored in the latest sampling period. Latching means fixing the data at the current moment in memory. In subsequent retrieval processes, the wind turbine interface device no longer updates the energy consumption value and ranking based on changes in the real-time status of the wind turbines, but instead uses the latched data as the control basis.

[0068] S63. After the sum of the terminal power of the wind turbines that are put into operation is greater than or equal to the power value to be consumed by the wind farm, if the power value to be consumed by the wind farm is less than or equal to zero and the duration exceeds the first preset time, the lock-up of the energy value to be consumed by each wind turbine is released.

[0069] The first preset time can be pre-set according to project needs. Release means releasing the latched state, allowing the wind turbine interface device to resume its function of updating the consumable energy value and its ranking according to the real-time status of the wind turbine. After releasing the latch, the wind turbine interface device no longer uses the latched data as the control basis, but performs a new round of calculation and ranking based on the current real-time data.

[0070] Setting a first preset time delay before releasing the latch can improve the problem of repeated latch establishment and release caused by instantaneous fluctuations in the total power value of the wind farm. For example, after the wind turbines are put into operation, the total power value of the wind farm may be slightly higher than the upper limit for a short period of time due to wind fluctuations or other reasons, causing the power to be consumed to briefly become positive. Without setting a delay, the latch may be repeatedly latched and released in a short period of time, increasing the uncertainty of the system. By setting a first preset time, the power surplus state is considered to have been stably eliminated only when the duration of the continuously non-zero power value detected in real time exceeds the first preset time, at which point the latch is released. In some embodiments, the wind turbine parameters also include the maximum output power and the maximum power duration; controlling at least some wind turbines to increase power includes: S71. Based on the supportable energy value corresponding to each wind turbine, control the wind turbine power increase in descending order of supportable energy value, so that the sum of the wind turbine power increase is greater than or equal to the power value to be supported by the wind farm; wherein, the supportable energy value is determined based on the product of the maximum output power and the maximum power duration.

[0071] The wind turbine parameters also include the maximum output power (Pwmax) and maximum power duration (Twmax) for each turbine. Maximum output power refers to the maximum active power that the wind turbine converter can output under short-term overload mode; the specific value depends on the turbine's rotor energy and the converter's short-term overload capacity design. Maximum power duration refers to the longest time the wind turbine converter can operate continuously at maximum output power without exceeding the thermal capacity limits of its internal power devices (such as IGBT modules). The maximum output power and maximum power duration are determined in real-time by the wind turbine converter based on its current operating status and thermal capacity margin, and then transmitted to the wind turbine interface device.

[0072] When controlling the power increase of some wind turbines, the wind turbine interface device can adopt a sorting and selection method based on the supportable energy value. Specifically, the wind turbine interface device determines the supportable energy value Eu for each wind turbine based on the product of its maximum output power Pwmax and its maximum power duration Twmax, i.e., Eu = Pwmax × Twmax. The supportable energy value represents the amount of additional energy that the wind turbine can provide under the current operating conditions if a power increase is implemented.

[0073] The fan interface device sorts the supported energy values ​​of each fan in descending order. When specifically selecting the fan whose power needs to be increased, any of the following methods can be used.

[0074] In one approach, the fan interface device sequentially controls the power increase of each fan according to a set order. After controlling the power increase of each fan, the power increase of the fan that has been increased (i.e., the difference between the maximum output power of the fan and the terminal power) is accumulated and compared with the power value to be supported. If the accumulated value is the power value to be supported at the time of triggering the time, the power increase of the next fan is controlled. If the accumulated value is greater than or equal to the power value to be supported, the power increase is stopped.

[0075] In another approach, the wind turbine interface device accumulates the power increase of each wind turbine in sequence. When the accumulated value first exceeds or equals the power to be supported, all wind turbines involved in the accumulation are selected at once, and a power increase command is simultaneously issued to each selected wind turbine. Each selected wind turbine then simultaneously increases its output power to its maximum output power.

[0076] Understandably, by selecting the wind turbine boosting power in descending order of the supportable energy value, the required power replenishment can be completed with fewer wind turbine boosting actions, reducing the number of communication interactions between the wind turbine interface device and each wind turbine, and shortening the call time.

[0077] In some embodiments, controlling at least a portion of the wind turbines to increase their power further includes: S72. Before controlling the power increase of the fans in descending order of the supportable energy value, latch the supportable energy value corresponding to each fan.

[0078] Specifically, the wind turbine interface device acquires data from the flexible DC control and protection system and the wind turbine converter at a fixed sampling period. Within each period, it calculates the supportable energy value and ranking of each wind turbine, and then stores the calculation results. When the trigger condition that the wind farm's supportable power value is greater than zero is met, the wind turbine interface device immediately latches the supportable energy value and ranking of each wind turbine stored in the latest sampling period. Latching means fixing the data at the current moment in memory. In subsequent retrieval processes, the wind turbine interface device no longer updates the supportable energy value and ranking based on changes in the real-time status of the wind turbines, but instead uses the latched data as the control basis.

[0079] S73. After the sum of the boosted power of the wind turbines is greater than or equal to the power value to be supported by the wind farm, if the power value to be supported by the wind farm is less than or equal to zero and the duration exceeds the second preset time, the lock-up of the energy value to be supported by each wind turbine is released.

[0080] The second preset time can be pre-set according to project needs. "Release" refers to releasing the latched state, allowing the wind turbine interface device to resume its function of updating the supported energy value and its sorting based on the real-time status of the wind turbine. After release, the wind turbine interface device no longer uses the latched data as the control basis, but instead performs a new round of calculations and sorting based on the current real-time data.

[0081] Setting a second preset time delay before releasing the latch when the real-time detected wind farm power value to be supported is less than or equal to zero can improve the repeated establishment and release of latch caused by the instantaneous fluctuation of the total power value of the wind farm.

[0082] It should be noted that the data used to determine whether to release the latch is real-time data obtained based on a fixed sampling period.

[0083] Please continue reading. Figure 3 As shown, in some embodiments, the wind farm parameters also include the real-time power on the wind farm side; after controlling at least some wind turbines to consume energy so that the sum of the terminal power of the wind turbines consuming energy is greater than or equal to the power to be consumed by the wind farm, the control method further includes: S8. If the real-time power of the wind farm is greater than the upper limit of the wind farm power and the duration exceeds the preset consumption waiting time, then at least some of the wind turbines that have not been put into energy consumption will be put into energy consumption so that the real-time power of the wind farm is less than or equal to the upper limit of the wind farm power.

[0084] It is important to understand that, as mentioned above, when the power to be consumed by the wind farm is greater than zero, at least some wind turbines are controlled to consume energy so that the sum of the terminal power of the turbines consuming energy is greater than or equal to the power to be consumed by the wind farm. The control objective is to eliminate the power difference. Due to factors such as some turbines not responding or sudden fluctuations in the power of turbines not consuming energy, after the control in step S6 is completed, the real-time power on the wind farm side may still be higher than the current upper limit of wind farm power, meaning the power surplus has not been completely eliminated. In this case, additional control is required based on the real-time detected power on the wind farm side.

[0085] Specifically, the wind turbine interface device acquires the real-time power Ps from the wind farm side sent by the flexible DC control and protection system through the DC system communication module, and compares this real-time power with the wind farm's power limit Pmax. When the real-time power from the wind farm side exceeds the wind farm's power limit, it indicates that the power injected into the converter station from the wind farm is still exceeding the limit. At this time, the wind turbine interface device selects at least some wind turbines that have not yet been put into operation to consume energy, and controls them to be put into operation. When selecting wind turbines that have not yet been put into operation, the previously latched energy consumption values ​​can be used to sort them in descending order to select wind turbines that have not yet been put into operation.

[0086] The wind turbine interface device continuously monitors real-time power changes on the wind farm side while controlling more wind turbines to be put into operation and consume energy. When the real-time power on the wind farm side drops to less than or equal to the wind farm's power limit, further operation is stopped. If, after all wind turbines that were not yet in operation have been put into operation, the real-time power on the wind farm side is still higher than the wind farm's power limit, all wind turbines can be maintained at zero power output until the receiving-end grid recovers or the converter station control system issues a new power command.

[0087] It should be noted that the preset waiting time Tddelay is used to wait for fluctuations in the real-time power of the wind farm to adjust to the middle of the set value. By setting the preset waiting time, only when the real-time power of the wind farm is continuously higher than the power limit for a period exceeding the preset waiting time is it considered a continuous power surplus, and a supplementary adjustment action is triggered. The preset waiting time Tddelay can be preset according to project needs.

[0088] Through the aforementioned adjustment mechanism, based on energy input control, a monitoring and supplementary control link based on real-time power is added. This allows the system to continue to add more wind turbine energy consumption capacity when the initial call fails to completely eliminate the power surplus, until the real-time power of the wind farm meets the upper limit requirement. The initial call ensures rapid response, while the adjustment mechanism ensures the integrity and convergence of control.

[0089] In some embodiments, after controlling at least a portion of the wind turbines to increase their power so that the sum of the increased power of the wind turbines is greater than or equal to the power value to be supported by the wind farm, the control method further includes: S9. If the real-time power of the wind farm is less than the lower limit of the wind farm power and the duration exceeds the preset support waiting time, then at least a portion of the wind turbines whose power has not been increased will have their power increased so that the real-time power of the wind farm is greater than or equal to the lower limit of the wind farm power.

[0090] It is important to understand that, as mentioned above, when the power to be supported by the wind farm is greater than zero, at least some wind turbines are controlled to increase their power so that the sum of the increased power of the turbines is greater than or equal to the power to be supported by the wind farm. The control objective is to eliminate the power deficit. Due to factors such as some turbines not responding and power fluctuations of turbines that have not increased their power, after the control in step S7 is completed, the real-time power on the wind farm side may still be lower than the lower limit of the wind farm power, meaning the power deficit has not been completely eliminated. In this case, additional control is required based on the real-time detected power on the wind farm side.

[0091] Specifically, the wind turbine interface device acquires the real-time power Ps from the wind farm side sent by the flexible DC control and protection system through the DC system communication module, and compares this real-time power with the wind farm power lower limit Pmin. When the real-time power from the wind farm side is less than the wind farm power lower limit, it indicates that the power injected into the converter station from the wind farm is still insufficient. At this time, the wind turbine interface device selects at least some wind turbines that have not yet had their power increased, and controls them to increase their power to their respective maximum output power. When selecting wind turbines that have not yet had their power increased, the supported energy value latched at the initial call is used for sorting, and wind turbines that have not yet had their power increased are selected in descending order to continue increasing their power.

[0092] The wind turbine interface device continuously monitors real-time power changes on the wind farm side while controlling more wind turbines to increase their power. When the real-time power on the wind farm side rises to a level greater than or equal to the wind farm's lower power limit, further increases are stopped. If, after all wind turbines whose power has not yet been increased have been increased, the real-time power on the wind farm side is still below the wind farm's lower power limit, all wind turbines will continue to operate at their maximum output power until the receiving-end grid recovers or the converter station control system issues a new power command.

[0093] It should be noted that the preset support waiting time Tudelay is also used to wait for the fluctuation process of the wind farm's real-time power adjustment to the middle of the set value. The preset support waiting time Tudelay can be preset according to project needs.

[0094] The aforementioned adjustment mechanism adds real-time power monitoring and supplementary control, enabling the system to continue adding support capacity from more wind turbines if the initial call fails to completely eliminate the power deficit, until the wind farm's real-time power meets the lower power limit requirement. The initial call ensures rapid response, while the adjustment mechanism ensures control integrity and convergence.

[0095] In some embodiments, the wind turbines in a wind farm are pre-divided into multiple turbine groups. It should be understood that the grouping can be based on the collector lines, with each turbine connected to a collector line forming a turbine group; or it can be based on busbar areas, with turbines connected to the same busbar area forming a turbine group. Other grouping rules may also be used.

[0096] Controlling at least some wind turbines to consume energy includes: when the power to be consumed by the wind farm is greater than zero, controlling at least one wind turbine unit to consume energy so that the sum of the terminal power of the wind turbine units consuming energy is greater than or equal to the power to be consumed by the wind farm.

[0097] Controlling the boosted power of at least a portion of the wind turbines includes: when the power value to be supported by the wind farm is greater than zero, controlling the boosted power of at least one wind turbine unit so that the sum of the boosted power of the wind turbine units is greater than or equal to the power value to be supported by the wind farm.

[0098] Specifically, the wind turbine interface device can control the system on a unit-by-unit basis. When determining triggering conditions, the wind turbine interface device first determines the consumable energy value and the supportable energy value corresponding to each wind turbine unit. Specifically, the consumable energy value of a wind turbine unit is the sum of the consumable energy values ​​of all wind turbines in that unit, and the supportable energy value of a wind turbine unit is the sum of the supportable energy values ​​of all wind turbines in that unit. The wind turbine interface device sorts the wind turbine units in descending order of their consumable energy values ​​for energy input control; and sorts the wind turbine units in descending order of their supportable energy values ​​for power boost control.

[0099] When the power consumption value of the wind farm is greater than zero, the wind turbine interface device controls at least one wind turbine unit to engage in energy consumption, ensuring that the sum of the terminal power of the engaged wind turbine units is greater than or equal to the power consumption value of the wind farm. Specifically, the wind turbine interface device selects wind turbine units sequentially according to their available energy consumption values. After selecting each wind turbine unit, the terminal power of all turbines within that unit is accumulated until the accumulated value is greater than or equal to the power consumption value at the trigger moment. Then, an energy consumption activation command is issued to the selected wind turbine unit as a whole. Each wind turbine converter within that unit operates uniformly according to the received command, simultaneously activating energy consumption. For wind turbine units that are not selected, the individual turbines within them remain inactive. When group control is used, the latched objects are the available energy consumption values ​​and their order for each wind turbine unit. During adjustments, control is added on a unit-by-unit basis.

[0100] When the power required to be supported by the wind farm is greater than zero, the wind turbine interface device controls at least one wind turbine unit to increase its power, so that the sum of the increased power of the wind turbine units is greater than or equal to the power required to be supported by the wind farm. Specifically, the wind turbine interface device selects wind turbine units sequentially according to their supported energy values. After selecting each wind turbine unit, it accumulates the power increase of each turbine in that group (i.e., the difference between the maximum output power of each turbine and the terminal power) until the accumulated value is greater than or equal to the power required to be supported at the trigger time. Then, it issues a power increase command to the selected wind turbine unit as a whole. Each wind turbine converter in that wind turbine unit operates uniformly according to the received command, and simultaneously increases its output power to its respective maximum output power. Similarly, when group control is used, the latched objects are the supported energy values ​​and their order of each wind turbine unit, and supplementary control is added on a unit-by-unit basis.

[0101] By dividing the wind turbines into turbine groups according to their collection lines or busbar areas and controlling them as groups, the wind turbine interface device only needs to issue commands to several turbine groups to complete the control of all the wind turbines in the field. This avoids communicating with each wind turbine individually and effectively reduces the communication burden between the wind turbine interface device and each wind turbine. At the same time, the wind turbines in each group operate simultaneously, making full use of the advantages of parallel control within the group and further shortening the total time to complete the overall power regulation of the field.

[0102] In some embodiments, when the wind turbine interface device issues control commands on a per-turbine basis, the command issuance between each turbine can be configured with an activation delay and an deactivation delay. Specifically, when multiple turbines need to be activated sequentially, after the first turbine receives the command and begins operation, a certain delay is made before issuing the command to the second turbine, and so on. Similarly, when multiple turbines need to be deactivated sequentially, a deactivation delay is set between each group. By setting time intervals between the issuance of commands for each group, the change in the total power of the wind farm presents a stepped slope, avoiding a sudden jump in the total power of the wind farm caused by the simultaneous operation of multiple turbines, thereby reducing the impact on the AC bus voltage and frequency of the converter station. The specific values ​​of the activation delay and deactivation delay can be preset according to the scale of the wind farm and the withstand capability of the converter station, and this application does not limit them.

[0103] It should be noted that steps S1 to S9 above are numbered for ease of description only and are not a restriction on the execution order of the method steps. In actual implementation, the order of the steps can be adjusted according to actual needs, and some steps can be executed in parallel. As long as it does not deviate from the core concept of this application, the adjustment, merging, or splitting of the order of the steps are all within the protection scope of this application.

[0104] It should also be noted that when the power surplus or power deficit state has been eliminated, the wind turbine energy dispatch state is exited, and the wind turbine interface device enters real-time monitoring state. In this state, the wind turbine interface device continuously receives wind farm parameters from the flexible DC control and protection system and wind turbine parameters from each wind turbine converter, recalculates the energy consumption and support capacity of each wind turbine, and waits for the next trigger condition to occur. After the wind turbine interface device completes a dispatch and releases the latch, the wind turbine's operating state will return to the previous state, that is, restore the operating state before this dispatch. That is, wind turbines that have been put into energy consumption will exit the energy consumption input state, and wind turbines that have increased power will return to the normal power output state. After the flexible DC control and protection system reissues new wind farm power upper and lower limits and other parameters according to the grid operation requirements, the wind turbine interface device recalculates and judges based on the new boundary values ​​and the current real-time operating status parameters of each wind turbine, and executes the next round of energy dispatch control.

[0105] In summary, the wind turbine energy mobilization control method provided in this application establishes a direct energy coordination control channel between the converter station and the wind farm by connecting the flexible DC control and protection system and each wind turbine converter in the wind farm through a wind turbine interface device. Under the same control framework, this method simultaneously sets independent triggering conditions and corresponding wind turbine control actions for both power surplus and power deficit scenarios, achieving bidirectional adjustment of the wind farm's output power. Based on this, by multiplying the terminal power of each wind turbine by its sustainable energy consumption duration to obtain the consumable energy value, and multiplying the maximum output power by its sustainable overload duration to obtain the supportable energy value, wind turbines are selected for mobilization in descending order of energy value, achieving rapid coordination control between the DC transmission system and the new energy power generation system. Using this application, energy mobilization for hundreds of wind turbines can be achieved at the microsecond level, providing a fundamental technical basis for significantly reducing the capacity of DC energy-consuming equipment or even eliminating it altogether. This provides an effective means for offshore wind power to support onshore AC power grids, improving the economy, reliability, and grid-friendliness of the new energy DC transmission system. Therefore, the control method provided in this application can realize the rapid mobilization of wind turbine energy by the converter station control system. When there is a power surplus, the wind turbine energy consumption can be mobilized to reduce the output power of the wind farm. When there is a power deficit, the wind turbine power support capacity can be mobilized to increase the output power of the wind farm. This enhances the energy synergy between the DC transmission system and the new energy power generation system, and improves the stability and reliability of the flexible DC system operation.

[0106] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0107] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present application. Therefore, the content of this specification should not be construed as a limitation of the present application.

Claims

1. A control method for utilizing wind turbine energy, characterized in that, include: Wind farm parameters are obtained from a flexible DC control and protection system, including an upper limit value and a lower limit value of wind farm power. The turbine parameters for each wind turbine are obtained from the wind farm, including the turbine terminal power. The total power value of the wind farm is determined based on the terminal power of all the wind turbines. Based on the total power value of the wind farm and the upper limit of the wind farm power, the power value to be consumed by the wind farm is determined. Based on the total power value of the wind farm and the lower limit of the wind farm power, the power value to be supported by the wind farm is determined. When the power to be consumed by the wind farm is greater than zero, at least some of the wind turbines are controlled to consume energy so that the sum of the terminal power of the wind turbines that consume energy is greater than or equal to the power to be consumed by the wind farm. When the power value to be supported by the wind farm is greater than zero, at least a portion of the wind turbines are controlled to increase their power so that the sum of the increased power of the wind turbines is greater than or equal to the power value to be supported by the wind farm.

2. The control method according to claim 1, characterized in that, The fan parameters also include the available time for internal energy consumption; The control of at least a portion of the wind turbines to consume energy includes: Based on the energy consumption value corresponding to each wind turbine, the wind turbines are controlled to consume energy in descending order of the energy consumption value, so that the sum of the terminal power of the wind turbines that consume energy is greater than or equal to the power consumption value of the wind farm. The energy consumption value is determined based on the product of the terminal power and the available time for internal energy consumption.

3. The control method according to claim 2, characterized in that, The control of at least a portion of the wind turbines to consume energy also includes: Before controlling the wind turbines to consume energy in descending order of the available energy values, the available energy value corresponding to each wind turbine is locked; If the sum of the terminal power of the wind turbines that are put into operation is greater than or equal to the power value to be consumed by the wind farm, and if the power value to be consumed by the wind farm is less than or equal to zero and the duration exceeds a first preset time, the lock-up of the energy value to be consumed for each wind turbine is released.

4. The control method according to claim 1, characterized in that, The fan parameters also include the maximum output power and the maximum power duration; The control of at least a portion of the wind turbine's power increase includes: Based on the supportable energy value corresponding to each wind turbine, the wind turbine boosting power is controlled in descending order of the supportable energy value, so that the sum of the boosting power of the wind turbines is greater than or equal to the power value to be supported by the wind farm. The supported energy value is determined based on the product of the maximum output power and the maximum power duration.

5. The control method according to claim 4, characterized in that, The control of at least a portion of the wind turbine's power increase also includes: Before controlling the power increase of the wind turbines in descending order of the supported energy values, the supported energy value corresponding to each wind turbine is latched. If the sum of the boosted power of the wind turbines is greater than or equal to the power value to be supported by the wind farm, and if the power value to be supported by the wind farm is less than or equal to zero and the duration exceeds the second preset time, the latching of the energy value to be supported by each wind turbine is released.

6. The control method according to claim 1, characterized in that, The wind farm parameters also include the real-time power on the wind farm side; After controlling at least a portion of the wind turbines to consume energy, such that the sum of the terminal power of the wind turbines consuming energy is greater than or equal to the power to be consumed by the wind farm, the control method further includes: If the real-time power of the wind farm is greater than the upper limit of the wind farm power and the duration exceeds the preset consumption waiting time, then at least a portion of the wind turbines that have not yet been put into energy consumption will be put into energy consumption so that the real-time power of the wind farm is less than or equal to the upper limit of the wind farm power.

7. The control method according to claim 6, characterized in that, After controlling at least a portion of the wind turbines to increase their power so that the sum of the increased power of the wind turbines is greater than or equal to the power value to be supported by the wind farm, the control method further includes: If the real-time power of the wind farm is less than the lower limit of the wind farm power and the duration exceeds the preset support waiting time, then at least a portion of the wind turbines whose power has not been increased will have their power increased so that the real-time power of the wind farm is greater than or equal to the lower limit of the wind farm power.

8. The control method according to claim 1, characterized in that, The wind turbines in the wind farm are pre-divided into multiple turbine groups; controlling at least a portion of the wind turbines to consume energy includes: When the power to be consumed by the wind farm is greater than zero, at least one of the wind turbines is controlled to consume energy so that the sum of the terminal power of the wind turbines that consume energy is greater than or equal to the power to be consumed by the wind farm. The control of at least a portion of the wind turbine's power increase includes: When the power value to be supported by the wind farm is greater than zero, control at least one of the wind turbine units to increase its power so that the sum of the increased power of the wind turbine units is greater than or equal to the power value to be supported by the wind farm.

9. A wind turbine interface device for utilizing wind turbine energy, characterized in that, include: A DC system communication module is used to obtain wind farm parameters from a flexible DC control and protection system. The wind farm parameters include an upper limit value for wind farm power and a lower limit value for wind farm power. The wind turbine converter communication module is used to obtain the wind turbine parameters of each wind turbine from the wind farm, including the turbine terminal power. The energy consumption module is used to determine the power value to be consumed by the wind farm based on the total power value and the upper limit of the wind farm power; and when the power value to be consumed by the wind farm is greater than zero, control at least some of the wind turbines to consume energy so that the sum of the terminal power of the wind turbines that consume energy is greater than or equal to the power value to be consumed by the wind farm. The supporting energy dispatch module is used to determine the power value to be supported for the wind farm based on the total power value of the wind farm and the lower limit value of the wind farm power; and when the power value to be supported for the wind farm is greater than zero, control at least a portion of the wind turbines to increase their power so that the sum of the increased power of the wind turbines is greater than or equal to the power value to be supported for the wind farm.

10. The fan interface device according to claim 9, characterized in that, The wind turbines in the wind farm are pre-divided into multiple turbine groups; The wind turbine interface device and the flexible DC control and protection system communicate with each other using a cross-redundancy method; The wind turbine interface device communicates with each wind turbine unit via a point-to-point ring network, and the wind turbine converters in each wind turbine unit communicate in series via a daisy-chain method.

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