Transient adaptive control method and device for matching control type direct-drive wind turbine generator

Abstract

The application belongs to the technical field of power grid control, and provides a transient adaptive control method and device for a matching control type direct-drive wind turbine, which comprises the following steps: when the matching control type direct-drive wind turbine fails, the matching control type direct-drive wind turbine is phase-locked through an unloading circuit of the matching control type direct-drive wind turbine; when the matching control type direct-drive wind turbine is in a failure period, the reactive power of the matching control type direct-drive wind turbine is determined in real time according to the voltage of a grid-connected point of the matching control type direct-drive wind turbine; and the current transient component of the matching control type direct-drive wind turbine is inhibited according to a pre-generated virtual resistance. The embodiment of the application provides a transient adaptive control method for the matching control type direct-drive wind turbine, which takes into account current limiting and active support of reactive voltage.

Description

Technical Field

[0001] This application belongs to the field of power grid control technology, and in particular relates to the field of grid-connected new energy unit control technology, especially a transient adaptive control method and device for a matched control type direct-drive wind turbine. Background Technology

[0002] Currently, with the gradual promotion and application of grid-connected new energy generating units and energy storage, more and more equipment in power plants can provide active support, exhibiting different principles and response characteristics. Grid-connected control enables converters to possess external characteristics similar to synchronous generators, effectively solving problems such as weak inertia and low short-circuit ratio faced by "high-voltage and high-efficiency" power systems. However, during grid faults, the instantaneous component of short-circuit current in grid-connected converters can reach 4 to 10 times the rated current, far exceeding their tolerance capacity of 1.2 to 1.5 times the rated current. Currently, additional current control loops are mostly used to limit this. Due to limitations in control bandwidth, current units still have the problem of short-time inrush current exceeding limits under grid faults. In addition, the short-circuit current and voltage support interact, which is not considered under grid faults. Summary of the Invention

[0003] The transient adaptive control method and device for matched control type direct drive wind turbine provided by the present invention aims to at least solve the technical problem of large-scale grid disconnection of new energy caused by insufficient active frequency and voltage support capability in the prior art.

[0004] To address the technical problems in the background section of this application, the present invention provides the following technical solutions:

[0005] In a first aspect, the present invention provides a transient adaptive control method for a matched-control type direct-drive wind turbine generator, the method comprising:

[0006] When the matched control type direct drive wind turbine unit fails, the phase of the matched control type direct drive wind turbine unit is locked through the unloading circuit of the matched control type direct drive wind turbine unit.

[0007] When the matched-control direct-drive wind turbine is in a fault period, the reactive power of the matched-control direct-drive wind turbine is determined in real time based on the voltage at the grid connection point of the matched-control direct-drive wind turbine; and

[0008] The transient current component of the matched-control direct-drive wind turbine is suppressed based on the pre-generated virtual resistor.

[0009] In some embodiments of this application, phase locking of the matched control type direct drive wind turbine includes:

[0010] The DC voltage synchronization link of the matched control type direct drive wind turbine is disconnected by the unloading circuit.

[0011] In some embodiments of this application, a transient adaptive control method for a matched-control type direct-drive wind turbine generator further includes:

[0012] When the DC voltage of the matched control type direct drive wind turbine is greater than the DC voltage detection threshold, and the fault voltage of the matched control type direct drive wind turbine is less than the fault voltage detection threshold, it is determined that the matched control type direct drive wind turbine has failed.

[0013] In some embodiments of this application, the reactive power of the matched-control direct-drive wind turbine is determined in real time based on the voltage at the grid connection point of the matched-control direct-drive wind turbine, including:

[0014] The nominal value of the reactive current corresponding to the reactive power is determined in real time based on the per-unit value of the voltage at the grid connection point.

[0015] The nominal value of the reactive power command during the fault is determined in real time based on the nominal value of the d-axis component of the voltage at the grid connection point.

[0016] In some embodiments of this application, the step of generating the virtual resistor includes:

[0017] The virtual resistor is determined based on the relationship between the output current of the grid-side inverter of the matched control type direct drive wind turbine and the threshold value of the starting current of the virtual resistor.

[0018] Secondly, the present invention provides a transient adaptive control device for matched-control type direct-drive wind turbine generators, the device comprising:

[0019] The unit phase interlocking module is used to interlock the phase of the matched control direct drive wind turbine unit through the unloading circuit of the matched control direct drive wind turbine unit when the matched control type direct drive wind turbine unit fails.

[0020] A real-time reactive power update module is used to determine the reactive power of the matched-control direct-drive wind turbine in real time based on the voltage at the grid connection point of the matched-control direct-drive wind turbine when the matched-control direct-drive wind turbine is in a fault period; and

[0021] A current transient suppression module is used to suppress the current transient components of the matched-control direct-drive wind turbine based on a pre-generated virtual resistance.

[0022] In some embodiments of this application, the unit phase interlocking module includes:

[0023] The synchronization link cutoff unit is used to cut off the DC voltage synchronization link of the matched control type direct drive wind turbine through the unloading circuit.

[0024] In some embodiments of this application, a transient adaptive control device for a matched-control type direct-drive wind turbine generator further includes:

[0025] The unit fault judgment module is used to determine that the matched control type direct drive wind turbine unit has failed when the DC voltage of the matched control type direct drive wind turbine unit is greater than the DC voltage detection threshold and the fault voltage of the matched control type direct drive wind turbine unit is less than the fault voltage detection threshold.

[0026] In some embodiments of this application, the reactive power real-time update module includes:

[0027] The reactive current nominal value determination unit is used to determine the nominal value of the reactive current corresponding to the reactive power in real time based on the per-unit value of the voltage at the grid connection point.

[0028] The instruction named value determination unit is used to determine the named value of the reactive power instruction during the fault period in real time based on the named value of the d-axis component of the voltage at the grid connection point.

[0029] In some embodiments of this application, a transient adaptive control device for a matched-control type direct-drive wind turbine generator further includes:

[0030] A virtual resistance generation module is used to generate the virtual resistance, and the virtual resistance generation module includes:

[0031] A virtual resistor generation unit is used to determine the virtual resistor based on the relationship between the output current of the grid-side inverter of the matched control type direct drive wind turbine and the threshold value of the starting current of the virtual resistor.

[0032] Thirdly, the present invention provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the steps of a transient adaptive control method for a matched control type direct-drive wind turbine.

[0033] Fourthly, the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of a transient adaptive control method for a matched control type direct-drive wind turbine.

[0034] Fifthly, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of a transient adaptive control method for a matched-control type direct-drive wind turbine generator.

[0035] As described above, embodiments of the present invention provide a transient adaptive control method and apparatus for matched-control direct-drive wind turbine generators. The corresponding transient adaptive control method for matched-control direct-drive wind turbine generators includes: first, when a fault occurs in the matched-control direct-drive wind turbine generator, phase blocking is performed on the matched-control direct-drive wind turbine generator through its unloading circuit; next, when the matched-control direct-drive wind turbine generator is in a fault period, the reactive power of the matched-control direct-drive wind turbine generator is determined in real time based on the voltage at the grid connection point of the matched-control direct-drive wind turbine generator; and finally, the transient current component of the matched-control direct-drive wind turbine generator is suppressed based on a pre-generated virtual resistor.

[0036] This invention comprehensively considers factors such as the steady-state component and transient component of short-circuit current, reactive voltage support, and voltage source characteristics. It overcomes the shortcomings of existing methods that do not consider voltage support when suppressing transient inrush current, preserves the voltage source characteristics of matched-control direct-drive wind turbines, and avoids the problem of excessive dependence on system parameters caused by the use of voltage vector limiting. At the same time, the parameter design is simple and convenient for engineering practice. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a flowchart illustrating a transient adaptive control method for a matched-control type direct-drive wind turbine generator according to an embodiment of the present invention. Figure 1 .

[0039] Figure 2 This is a flowchart illustrating step 100 of a transient adaptive control method for a matched-control type direct-drive wind turbine in an embodiment of the present invention.

[0040] Figure 3 This is a flowchart illustrating a transient adaptive control method for a matched-control type direct-drive wind turbine generator according to an embodiment of the present invention. Figure 2 .

[0041] Figure 4 This is a flowchart illustrating step 200 of a transient adaptive control method for a matched-control type direct-drive wind turbine in an embodiment of the present invention.

[0042] Figure 5 This is a flowchart illustrating a transient adaptive control method for a matched-control type direct-drive wind turbine generator according to an embodiment of the present invention. Figure 3 .

[0043] Figure 6 This is a flowchart illustrating step 500 of a transient adaptive control method for a matched-control type direct-drive wind turbine in an embodiment of the present invention.

[0044] Figure 7 This is a flowchart illustrating a transient adaptive control method for a matched-control type direct-drive wind turbine generator according to a specific embodiment of the present invention.

[0045] Figure 8 This is a control block diagram of a transient adaptive control method for a matched control type direct-drive wind turbine generator according to a specific embodiment of the present invention.

[0046] Figure 9 This is a fault detection and control block diagram in a specific embodiment of the present invention.

[0047] Figure 10 This is a control block diagram of phase locking in a specific embodiment of the present invention.

[0048] Figure 11 This is a block diagram of adaptive reactive power switching control in a specific embodiment of the present invention.

[0049] Figure 12 This is a topology diagram of a 5MW matched control type direct drive wind turbine model in a specific embodiment of the present invention.

[0050] Figure 13 The waveforms of current, reactive power, and synchronization frequency are shown for Strategy I in a specific embodiment of the present invention.

[0051] Figure 14 The waveforms of current, reactive power, and synchronization frequency in Strategy II of the specific embodiment of the present invention are shown.

[0052] Figure 15 The waveforms of current, reactive power, and synchronization frequency are shown for Strategy III in a specific embodiment of the present invention.

[0053] Figure 16 The waveforms of current, reactive power, and synchronization frequency for Strategy IV in a specific embodiment of the present invention are shown.

[0054] Figure 17 This is a schematic diagram comparing the current waveforms in scenarios with short-circuit ratios of 4 and 3 in a specific embodiment of the present invention.

[0055] Figure 18 This is a schematic diagram comparing the current waveforms in scenarios with short-circuit ratios of 2 and 1 in a specific embodiment of the present invention.

[0056] Figure 19This is the voltage waveform of continuous high-low switching at the grid connection point in a specific embodiment of the present invention.

[0057] Figure 20 The current waveform is shown in the conventional control strategy in a specific embodiment of the present invention.

[0058] Figure 21 The current waveform is shown in the transient adaptive control strategy of the matched control type direct-drive wind turbine generator that takes into account both current limiting and reactive voltage support in a specific embodiment of the present invention.

[0059] Figure 22 This is the waveform corresponding to a single-phase short circuit in the matched control type direct drive wind turbine system in a specific embodiment of the present invention, between 5s and 5.5s.

[0060] Figure 23 This is the waveform corresponding to a two-phase ground short circuit in the matched control type direct drive wind turbine system in a specific embodiment of the present invention from 5s to 5.5s.

[0061] Figure 24 This is a block diagram of a transient adaptive control device for a matched control type direct-drive wind turbine generator in an embodiment of the present invention. Figure 1 .

[0062] Figure 25 This is a block diagram of the unit phase interlocking module 10 in an embodiment of the present invention.

[0063] Figure 26 This is a block diagram of a transient adaptive control device for a matched control type direct-drive wind turbine generator in an embodiment of the present invention. Figure 2 .

[0064] Figure 27 This is a block diagram of the reactive power real-time update module 20 in an embodiment of the present invention.

[0065] Figure 28 This is a block diagram of a transient adaptive control device for a matched control type direct-drive wind turbine generator in an embodiment of the present invention. Figure 3 .

[0066] Figure 29 This is a block diagram of the virtual resistance generation module 50 in an embodiment of the present invention.

[0067] Figure 30 This is a schematic diagram of the structure of an electronic device in an embodiment of the present invention. Detailed Implementation

[0068] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0069] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention 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.

[0070] It should be noted that the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or apparatuses. Without conflict, the embodiments and features in the embodiments of this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0071] In the current power grid, synchronous generator units with autonomous voltage-building capabilities are the mainstay for ensuring the synchronous and stable operation of the power system. In recent years, many newly added renewable energy units have adopted a grid-following control method using phase-locked loops (PLLs) to passively follow the grid voltage, lacking the ability to actively support frequency and voltage. Their large-scale replacement of synchronous generators has weakened the foundation for maintaining the safe and stable frequency and voltage of the system. In recent years, many regions have experienced large-scale grid disconnection events caused by insufficient active frequency and voltage support capabilities. Grid-based technology, by improving converter control methods, enables renewable energy units to establish grid voltage and frequency, allowing them to be connected to the grid as equivalent voltage sources. Through appropriate control, they can achieve active support functions such as inertial response, primary frequency regulation response, and rapid voltage regulation.

[0072] Currently, typical grid-based control strategies mainly include droop control, virtual synchronous generator (VSG) control, and matching control (MC). Among them, the matching control converter (MCC) is a grid-based converter that uses DC capacitor energy to simulate the rotor energy of a synchronous generator. Compared to the VSG control strategy, which uses active power-frequency synchronization, the MC strategy can also control the DC-side voltage, achieving synchronization between the DC-side voltage control and the converter. MCC only needs to measure the DC bus voltage to achieve autonomous synchronization with the grid and can directly provide the system's equivalent inertia. With these advantages, the matching control permanent magnet synchronous generator (MC-PMSG) has been tested and verified in many locations and has broad application prospects in the future.

[0073] Research on transient overcurrent suppression under MC-PMSG faults mainly includes two aspects: equipping the grid converter with an inner current loop control and open-loop control. Regarding transient current control in grid converters equipped with an inner current loop, some literature suggests switching the converter to current source control mode during the fault, which effectively controls the transient current but sacrifices its original voltage source characteristics. Other literature employs a dual voltage and current closed-loop control structure, which enhances the inverter's transient stability by accurately estimating the output current and applying it to feedforward control; however, this method involves complex parameter design and significant inrush current. Still other literature, targeting matched-control wind turbines, introduces a current controller and virtual admittance mechanism to suppress transient overcurrent; however, simulations show that this method still suffers from excessive inrush current during fault and recovery moments.

[0074] Regarding transient current control in open-loop controlled grid converters, some literature utilizes phasor limiting and virtual resistance techniques to effectively limit the VSG current during symmetrical short circuits in the grid, but this requires artificially reducing power output. Other literature achieves current suppression through dynamic compensation of the VSG power angle, but its reliance on memory elements increases the complexity of practical applications. Still other literature employs voltage limiting to restrict the steady-state component of transient current and suppresses instantaneous current surges through switching nonlinear resistors; however, this control strategy still suffers from excessive dependence on system parameters and limited consideration of voltage support.

[0075] Some of the methods and ideas described above can be applied to transient overcurrent control of MC-PMSG. However, their analysis often focuses on a specific characteristic of MC-PMSG, while transient inrush current, unstable reactive voltage support, and loss of voltage source characteristics usually occur simultaneously during transient periods. Therefore, this invention comprehensively considers the above factors and, based on the transient current generation mechanism and the GC0137 reactive voltage support standard, proposes a transient adaptive control strategy for MC-PMSG that balances current limiting and active reactive voltage support.

[0076] An embodiment of the present invention provides a specific implementation of a transient adaptive control method for a matched-control type direct-drive wind turbine generator, see below. Figure 1 The method includes:

[0077] Step 100: When the matched control type direct drive wind turbine unit fails, the phase of the matched control type direct drive wind turbine unit is locked through the unloading circuit of the matched control type direct drive wind turbine unit.

[0078] Step 200: When the matched-control direct-drive wind turbine is in a fault period, the reactive power of the matched-control direct-drive wind turbine is determined in real time based on the voltage at the grid connection point of the matched-control direct-drive wind turbine; and

[0079] Step 300: Suppress the transient current component of the matched-control direct-drive wind turbine based on the pre-generated virtual resistor.

[0080] As described above, embodiments of the present invention provide a transient adaptive control method for matched-control direct-drive wind turbine generators, comprising: first, when a fault occurs in the matched-control direct-drive wind turbine generator, phase blocking is performed on the matched-control direct-drive wind turbine generator through its unloading circuit; next, when the matched-control direct-drive wind turbine generator is in the fault period, the reactive power of the matched-control direct-drive wind turbine generator is determined in real time based on the voltage at the grid connection point of the matched-control direct-drive wind turbine generator; and finally, the transient current component of the matched-control direct-drive wind turbine generator is suppressed based on a pre-generated virtual resistor.

[0081] This invention provides a transient adaptive control method for MC-PMSG that takes into account both current limiting and active reactive voltage support.

[0082] Regarding step 100, it should be noted that the effectiveness of the fault detection and phase blocking control matching of the matched control type direct drive wind turbine depends on two factors: the current operating point and the grid voltage drop depth. These two factors determine whether the unloading circuit will operate. When the system enters the fault mode, phase blocking is performed to cut off the DC voltage synchronization link.

[0083] For step 200, in order to meet the requirements of current limiting and voltage support, adaptive reactive power switching control is carried out based on the generation mechanism of transient current and the GC0137 reactive power voltage support standard.

[0084] Step 300 provides an adaptive virtual resistance control strategy that enables the virtual resistance value to be linearly adjusted as the current changes. This control suppresses transient current components, operates only at the moment of a fault, and automatically disconnects from the matched control type direct drive wind turbine in other states.

[0085] In some embodiments of this application, see Figure 2 Step 100, which involves phase locking of the matched control type direct drive wind turbine, includes:

[0086] Step 101: Disconnect the DC voltage synchronization link of the matched control type direct drive wind turbine through the unloading circuit.

[0087] In some embodiments of this application, see Figure 3 A transient adaptive control method for matched-control type direct-drive wind turbine generators further includes:

[0088] Step 400: When the DC voltage of the matched control type direct drive wind turbine is greater than the DC voltage detection threshold, and the fault voltage of the matched control type direct drive wind turbine is less than the fault voltage detection threshold, it is determined that the matched control type direct drive wind turbine has failed.

[0089] The effectiveness of the matching control depends on two factors: the current operating point and the depth of the grid voltage drop. These two factors determine whether the unloading circuit will operate. The logic of the fault signal F is given by equation (1).

[0090]

[0091] In equation (1): U dc This refers to the DC voltage of the matched control type direct drive wind turbine, U dc,M This refers to the DC voltage detection threshold, U s This refers to the fault voltage of a matched control type direct drive wind turbine, U s,f This refers to the detection threshold for fault voltage.

[0092] On the DC side, the unloading circuit adjusts the power balance equation, confining the voltage within a preset threshold and no longer directly responding to grid frequency fluctuations. When the system enters a fault mode, the synchronization link is switched off, disconnecting the DC voltage synchronization link to lock its phase during the fault.

[0093] In some embodiments of this application, see Figure 4Step 200, which involves determining the reactive power of the matched-control direct-drive wind turbine in real time based on the voltage at the grid connection point of the matched-control direct-drive wind turbine, includes:

[0094] Step 201: Determine the nominal value of the reactive current corresponding to the reactive power in real time based on the per-unit value of the voltage at the grid connection point;

[0095] Step 202: Determine the nominal value of the reactive power command during the fault period in real time based on the nominal value of the d-axis component of the voltage at the grid connection point.

[0096] To meet the requirements of current limiting and voltage support, based on the indicators of the published standard "GC0137: Minimum Specifications Required to Provide UK Grid Capability" and the relevant requirements for low voltage ride-through of wind turbines in "GB / T19963.1-2021", the relationship between the grid connection point voltage and reactive current and the reactive power to be generated by the unit during voltage drop is shown in equations (2) and (3):

[0097]

[0098] In the formula: i q I represents the nominal value of reactive current. B u represents the reference value of the system output current. s I represents the per-unit value of the grid connection point voltage. max Q represents the per-unit limit value of the short-circuit current amplitude of the inverter. gref_lvrt U represents the named value of the reactive power command under fault conditions. sd Indicates the grid connection point voltage U s The named values ​​of the d-axis component.

[0099] In this application, the rated capacity S is taken as... N =5MW is the power reference value S B AC voltage rated value U N =563V is the voltage reference value U B The system output current reference value I can be calculated. B = 5.9166kA. (Using I) max Taking 1.2pu as an example, when the grid connection point voltage is less than 1p.u., the per-unit value of reactive current changes linearly with a fixed slope, realizing the adaptive correlation between reactive current and grid connection point voltage. At the same time, by combining equations (2) and (3), the reactive power command value of the unit under fault conditions will be adaptively correlated with the grid connection point voltage, and reactive power support can be realized according to the designed curve.

[0100] An adaptive reactive power switching control is proposed, combining voltage feedforward switching and adaptive reactive power switching. During fault periods, voltage feedforward control is introduced, and the voltage feedforward command is changed to U...sd This allows the amplitude generated by the converter to change synchronously with the amplitude generated by the power grid, achieving rapid matching between the internal potential and the fault voltage. Furthermore, phase blocking is employed during fault periods to achieve phase synchronization. The combination of these two measures satisfies the aforementioned steady-state AC component I. tsb The conditions for obtaining extreme values ​​can limit the steady-state component of the fault current. At the same time, it will not change the steady-state operating point before and after the fault, and reactive power command switching can provide reactive power support to the power grid.

[0101] In some embodiments of this application, see Figure 5 A transient adaptive control method for matched-control type direct-drive wind turbine generators further includes:

[0102] Step 500: Generate the virtual resistor; further, see... Figure 6 Step 500 includes:

[0103] Step 501: Determine the virtual resistor based on the relationship between the output current of the grid-side inverter of the matched control type direct drive wind turbine and the threshold value of the starting current of the virtual resistor.

[0104] Understandably, the adaptive reactive power switching control strategy only works on the steady-state component of the short-circuit current, and has a limited effect on suppressing the inrush current at the moment of a fault. Given that the decay rate of the inrush current is subject to certain factors, its decay process can be accelerated by introducing a virtual resistor, thereby achieving the effect of suppressing the inrush current.

[0105] However, once the fixed value of the virtual resistance is set, it not only reduces the decay time constant of the inrush current, but also inevitably affects the steady-state component of the short-circuit current and the transmission power of the entire system. Therefore, this paper designs an adaptive virtual resistance control strategy based on equation (4), so that the virtual resistance value can be linearly adjusted with the change of current. This control suppresses the transient component of the current, only operates at the moment of fault, and automatically returns to the operating point in other states. While suppressing the inrush current at the moment of fault, it can also eliminate the impact caused by the sudden change of the virtual resistance value.

[0106]

[0107] In equation (4): I t K represents the output current of the grid-side inverter of the matched control type direct-drive wind turbine; v Represents the virtual resistance adjustment coefficient; while I maxf This defines the starting current threshold for the virtual resistor.

[0108] As described above, embodiments of the present invention provide a transient adaptive control method for matched-control direct-drive wind turbine generators, comprising: first, when a fault occurs in the matched-control direct-drive wind turbine generator, phase blocking is performed on the matched-control direct-drive wind turbine generator through its unloading circuit; next, when the matched-control direct-drive wind turbine generator is in the fault period, the reactive power of the matched-control direct-drive wind turbine generator is determined in real time based on the voltage at the grid connection point of the matched-control direct-drive wind turbine generator; and finally, the transient current component of the matched-control direct-drive wind turbine generator is suppressed based on a pre-generated virtual resistor.

[0109] This invention proposes a transient adaptive control strategy for MC-PMSG that balances current limiting and reactive power voltage support, based on the generation mechanism of transient current and the GC0137 reactive power voltage support standard. The main components are as follows: The first part employs fault detection and phase-blocking control to address the loss of grid synchronization capability during grid faults, while simultaneously activating a load-releasing circuit to maintain power angle stability. The second part is adaptive reactive power switching control, utilizing the influencing factors of transient current to ensure the internal potential is equal to the grid voltage, satisfying the condition for the steady-state component of the fault current to reach its minimum value, and simultaneously designing reactive power according to the GC0137 standard to provide reactive power support. The third part is adaptive virtual resistance control, which suppresses the transient component of the fault current at the moment of fault, accelerates the decay rate of the transient component, and shortens its duration.

[0110] To further illustrate the solution, this invention also provides a specific implementation of the transient adaptive control method for matched-control type direct-drive wind turbine generators, see [link to relevant documentation]. Figure 7 as well as Figure 8 The method includes the following:

[0111] S1: Obtain the current operating point and the grid voltage drop depth, determine whether a low voltage fault has occurred and whether to perform phase blocking control;

[0112] Figure 9 This is a control block diagram of the fault detection and generation method provided by the present invention. Figure 10 This is a control block diagram for the phase-locking control provided by the present invention. (Refer to...) Figure 9 as well as Figure 10 The effectiveness of the matching control depends on two factors: the current operating point and the depth of the grid voltage drop. These two factors determine whether the unloading circuit will activate. When the system enters a fault mode, the synchronization link is switched off, and the DC voltage synchronization link is disconnected, causing it to be phase-locked during the fault.

[0113] S2: Adaptive reactive power control is performed based on the relevant requirements for reactive voltage support and current limiting.

[0114] Figure 11The block diagram for adaptive reactive power switching control is presented. Combining voltage feedforward switching and adaptive reactive power switching, the adaptive reactive power switching control is described. During fault periods, voltage feedforward control is introduced, and the voltage feedforward command is changed to U... sd This allows the amplitude generated by the converter to change synchronously with the amplitude generated by the power grid, achieving rapid matching between the internal potential and the fault voltage. Furthermore, phase blocking is employed during fault periods to achieve phase synchronization. The combination of these two measures satisfies the aforementioned steady-state AC component I. tsb The conditions for obtaining extreme values ​​can limit the steady-state component of the fault current. At the same time, it will not change the steady-state operating point before and after the fault, and reactive power command switching can provide reactive power support to the power grid.

[0115] S3: Perform adaptive virtual resistance control based on the current state at the moment of the fault.

[0116] Feasibility verification: The engineering simulation example system model provided in this application is as follows: Figure 12 As shown, four control strategies are set as follows:

[0117] Strategy I is the traditional control that does not perform any switching;

[0118] Strategy II employs only adaptive reactive power switching control;

[0119] Strategy III employs only adaptive virtual resistance control;

[0120] Strategy IV combines adaptive reactive power switching control with adaptive virtual resistance control, which is the MC-PMSG transient adaptive control strategy proposed in this invention. Simulation results for strategies I, II, III, and IV are as follows: Figure 12 , Figure 13 , Figure 14 , Figure 15 , Figure 16 , Figure 17 , Figure 18 , Figure 19 , Figure 20 , Figure 21 , Figure 22 As shown, the effectiveness of the present invention is verified.

[0121] Figures 13 to 16 This is a comparison of the current limiting and reactive power voltage support effects of different control strategies for the MC-PMSG model when the grid connection point voltage drops to 0.2 pu during a time interval of 5 to 5.5 seconds. Figure 13 The waveforms of current, reactive power, and synchronization frequency for Strategy I are shown. Figure 14 The waveforms for current, reactive power, and synchronization frequency are for Strategy II. Figure 15 The waveforms for current, reactive power, and synchronization frequency are for Strategy III. Figure 16The waveforms for current, reactive power, and synchronization frequency of Strategy IV are shown.

[0122] like Figures 13 to 16 As shown, using strategy I, the current can only be maintained within 4 p.u. during the fault, far exceeding the grid converter's tolerance capacity of 1.2 to 1.5 times the rated current. Synchronization frequency fluctuations are significant, and the provided dynamic reactive power gradually decreases. Large fluctuations occur during fault clearing, and neither current nor reactive power can recover to their original state in a timely manner. Using strategies II, III, and IV, the steady-state component of the fault current is within 1.3 p.u., the synchronization frequency is maintained at 1 p.u., and reactive power can stably increase to 0.2 p.u. At the moment of fault, strategy II experiences a current surge, while strategies III and IV can suppress this surge. However, strategy III has large harmonic components and a high distortion rate, making it difficult for reactive power to recover after fault clearing. Strategy IV has small harmonic components and a low distortion rate, limiting the steady-state and transient components of the fault current to within 1.3 p.u., and enabling rapid recovery of reactive power after fault clearing.

[0123] In summary, by employing Strategy IV, namely the MC-PMSG transient adaptive control strategy proposed in this invention, both steady-state and transient components of the fault current can be suppressed. Compared to traditional control, it can control the fault current to within 1.3 pu with the lowest waveform distortion rate, meeting the grid converter's withstand capability of 1.2 to 1.5 times the rated current. Simultaneously, it can provide stable reactive power voltage support during faults, and the current and reactive power can quickly recover to their pre-fault state after the fault is cleared. Subsequent verifications are all based on this control strategy.

[0124] To further verify the effectiveness of the proposed MC-PMSG transient adaptive control strategy under different grid strengths, the system short-circuit ratios were set to 4, 3, 2, and 1, corresponding to scenarios changing from a strong grid to a weak grid. The fault was set so that the grid voltage dropped to 0.2 pu between 5 and 5.5 seconds, with the corresponding waveform as shown below. Figure 17 as well as Figure 18 As shown. Figure 17 as well as Figure 18 In a system configured with a transient adaptive control strategy for MC-PMSG that balances current limiting and reactive power voltage support, the system short-circuit ratios are set to 4, 3, 2, and 1, corresponding to scenarios transitioning from a strong grid to a weak grid. The fault condition is defined as the waveform corresponding to a grid voltage drop to 0.2 pu during the 5-5.5 s interval. Figure 17 The left side shows the current waveform under a short-circuit ratio of 4. Figure 17 The right side shows the current waveform under a short-circuit ratio of 3. Figure 18 The left side shows the current waveform when the short-circuit ratio is 2. Figure 18 The right side shows the current waveform when the short-circuit ratio is 1.

[0125] Depend on Figure 17 as well as Figure 17 It can be seen that the control strategy described in this paper ensures that the fault current does not exceed 1.3 pu under grid voltage drop conditions, and is applicable to different grid strength scenarios, meeting the tolerance capability of the grid converter of 1.2 to 1.5 times the rated current.

[0126] To verify the multi-condition applicability of the MC-PMSG transient adaptive control strategy proposed in this invention, continuous high and low voltage ride-through and asymmetrical faults at the grid connection point were set up. The effectiveness of the proposed control strategy was verified by comparing it with traditional control.

[0127] To verify the effectiveness of the proposed MC-PMSG transient adaptive control strategy under continuous grid connection voltage crossover, two operating conditions were designed: 1) From 5s to 5.625s, the grid connection voltage drops to 0.2 pu, from 5.625s to 6.125s, the grid connection voltage rises to 1.3 pu, and after 6.125s, it recovers to 1 pu; 2) From 5s to 5.5s, the grid connection voltage rises to 1.3 pu, from 5.5s to 6.125s, the grid connection voltage drops to 0.2 pu, and after 6.125s, it recovers to 1 pu. The traditional strategy and the MC-PMSG transient adaptive control strategy are compared, such as... Figures 19 to 21 The waveforms shown are those of the MC-PMSG system during the continuous high-low voltage transition at the grid connection point from 5s to 6.125s.

[0128] like Figures 19 to 21 As shown, under the condition of continuous voltage drop at the grid connection point, the fault current using the traditional control strategy will exceed 1.3 pu and the recovery time after the fault is cleared is relatively long. The MC-PMSG transient adaptive control strategy proposed in this invention can ensure that the fault current does not exceed 1.3 pu under the condition of varying degrees of voltage drop at the grid connection point and can quickly recover to the original state after the fault is cleared, thus meeting the grid converter's withstand capability of 1.2 to 1.5 times the rated current.

[0129] To further verify the multi-condition applicability of the MC-PMSG transient adaptive control strategy proposed in this invention, two fault scenarios—single-phase short circuit and two-phase-to-ground short circuit—were simulated between 5s and 5.5s. The traditional strategy and the MC-PMSG transient adaptive control strategy were compared, as follows: Figure 22 (The waveform corresponding to a single-phase short circuit in the MC-PMSG system between 5s and 5.5s) and Figure 23 (The waveform corresponding to the two-phase ground short circuit in the MC-PMSG system from 5s to 5.5s is shown.)

[0130] like Figure 22As shown (the left side shows the grid-connected point voltage and current waveforms under the traditional control strategy, and the right side shows the grid-connected point voltage and current waveforms under the transient adaptive control strategy of MC-PMSG, which takes into account both current limiting and reactive voltage support), under the condition of a single-phase ground fault, the fault current using the traditional control method would far exceed 1.3 pu, the reactive voltage support would be unstable during the fault, and the grid-connected point voltage would gradually decrease. However, the MC-PMSG transient adaptive control strategy proposed in this paper can maintain the fault current below 1.3 pu, meeting the grid converter's withstand capability requirement of 1.2 to 1.5 times the rated current, while providing stable reactive voltage support up to 0.75 pu. After the fault is cleared, the current and voltage can quickly return to their original states.

[0131] like Figure 23 As shown (the left side shows the grid-connected point voltage and current waveforms under the traditional control strategy, and the right side shows the grid-connected point voltage and current waveforms under the transient adaptive control strategy of MC-PMSG, which takes into account both current limiting and reactive voltage support), under the condition of a two-phase-to-ground short-circuit fault, the fault current using the traditional control method would far exceed 1.3 pu, the reactive voltage support would be unstable during the fault, and the grid-connected point voltage would gradually decrease. However, the MC-PMSG transient adaptive control strategy proposed in this paper can maintain the fault current below 1.3 pu, meeting the grid converter's tolerance capability of 1.2 to 1.5 times the rated current, while providing stable reactive voltage support up to 0.5 pu. After the fault is cleared, the current and voltage can quickly return to their original states.

[0132] In summary, the MC-PMSG transient adaptive control strategy described in this invention, which combines current limiting and active reactive voltage support, comprehensively considers factors such as short-circuit current, reactive voltage support, and voltage source characteristics. Based on the generation mechanism of transient overcurrent and reactive voltage support standards, it proposes an MC-PMSG transient adaptive control strategy that combines current limiting and active reactive voltage support. This strategy suppresses both steady-state and transient current components, provides stable reactive voltage support, and retains voltage source characteristics.

[0133] It can effectively suppress fault overcurrent of MC-PMSG under different grid strengths while providing stable reactive voltage support, and meet the withstand capability of grid converters of 1.2 to 1.5 times rated current. The parameter design is simple and reduces the current limiting cost of devices, which has certain engineering guidance significance.

[0134] As described above, a specific application example of the present invention provides a transient adaptive control method for matched-control direct-drive wind turbine generators, comprising: first, when a fault occurs in the matched-control direct-drive wind turbine generator, phase blocking is performed on the matched-control direct-drive wind turbine generator through its unloading circuit; next, when the matched-control direct-drive wind turbine generator is in the fault period, the reactive power of the matched-control direct-drive wind turbine generator is determined in real time based on the voltage at the grid connection point of the matched-control direct-drive wind turbine generator; and finally, the transient current component of the matched-control direct-drive wind turbine generator is suppressed based on a pre-generated virtual resistor.

[0135] In summary, this invention comprehensively considers factors such as the steady-state and transient components of short-circuit current, reactive voltage support, and voltage source characteristics. It overcomes the shortcomings of existing methods that fail to consider voltage support when suppressing transient inrush currents, preserves the voltage source characteristics of the MC-PMSG, and avoids the problem of excessive dependence on system parameters caused by voltage vector limiting. The proposed control strategy can effectively suppress fault overcurrent of the MC-PMSG while providing stable reactive voltage support under different grid strengths, meeting the withstand capability of 1.2 to 1.5 times the rated current of the grid converter. The parameter design is simple and reduces the cost of device current limiting, thus possessing certain engineering guiding significance.

[0136] Based on the same inventive concept, this application also provides a transient adaptive control device for matched-control direct-drive wind turbine generators, which can be used to implement the methods described in the above embodiments, as shown in the following embodiments. Since the principle of the transient adaptive control device for matched-control direct-drive wind turbine generators is similar to that of the transient adaptive control method for matched-control direct-drive wind turbine generators, the implementation of the transient adaptive control device for matched-control direct-drive wind turbine generators can refer to the implementation of the transient adaptive control method for matched-control direct-drive wind turbine generators, and repeated details will not be elaborated further. As used below, the terms "unit" or "module" can refer to a combination of software and / or hardware that implements a predetermined function. Although the system described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0137] Embodiments of the present invention provide a specific implementation of a transient adaptive control device for a matched-control direct-drive wind turbine that can realize a transient adaptive control method for matched-control direct-drive wind turbines. See [link to specific implementation details]. Figure 24 A transient adaptive control device for a matched control type direct-drive wind turbine specifically includes the following:

[0138] The unit phase interlocking module 10 is used to interlock the phase of the matched control direct drive wind turbine through the unloading circuit of the matched control direct drive wind turbine when the matched control type direct drive wind turbine fails.

[0139] The reactive power real-time update module 20 is used to determine the reactive power of the matched-control direct-drive wind turbine in real time based on the voltage at the grid connection point of the matched-control direct-drive wind turbine when the matched-control direct-drive wind turbine is in a fault period; and

[0140] The current transient suppression module 30 is used to suppress the current transient component of the matched control type direct drive wind turbine based on the pre-generated virtual resistance.

[0141] In some embodiments of this application, see Figure 25 The unit phase interlocking module 10 includes:

[0142] Synchronization link cutoff unit 10a is used to cut off the DC voltage synchronization link of the matched control type direct drive wind turbine through the unloading circuit.

[0143] In some embodiments of this application, see Figure 26 A transient adaptive control device for matched-control type direct-drive wind turbine generators further includes:

[0144] The unit fault judgment module 40 is used to determine that the matched control type direct drive wind turbine unit has failed when the DC voltage of the matched control type direct drive wind turbine unit is greater than the DC voltage detection threshold and the fault voltage of the matched control type direct drive wind turbine unit is less than the fault voltage detection threshold.

[0145] In some embodiments of this application, see Figure 27 The reactive power real-time update module 20 includes:

[0146] The reactive current nominal value determination unit 20a is used to determine the nominal value of the reactive current corresponding to the reactive power in real time based on the per-unit value of the voltage at the grid connection point.

[0147] The instruction named value determination unit 20b is used to determine the named value of the reactive power instruction during the fault period in real time based on the named value of the d-axis component of the voltage at the grid connection point.

[0148] In some embodiments of this application, see Figure 28 A transient adaptive control device for matched-control type direct-drive wind turbine generators further includes:

[0149] Virtual resistance generation module 50, used to generate the virtual resistance, see [link to module 50]. Figure 29 The virtual resistance generation module 50 includes:

[0150] The virtual resistor generation unit 50a is used to determine the virtual resistor based on the relationship between the output current of the grid-side inverter of the matched control type direct drive wind turbine and the threshold value of the starting current of the virtual resistor.

[0151] As described above, embodiments of the present invention provide a transient adaptive control device for a matched-control direct-drive wind turbine, comprising: a phase-locking module for locking the phase of the matched-control direct-drive wind turbine through its unloading circuit when a fault occurs; a real-time reactive power update module for determining the reactive power of the matched-control direct-drive wind turbine in real time based on the voltage at its grid connection point when the turbine is in a fault period; and a current transient suppression module for suppressing the transient current component of the matched-control direct-drive wind turbine based on a pre-generated virtual resistance.

[0152] This invention comprehensively considers factors such as the steady-state component and transient component of short-circuit current, reactive voltage support, and voltage source characteristics. It overcomes the shortcomings of existing methods that do not consider voltage support when suppressing transient inrush current, retains the characteristics of the MC-PMSG voltage source, and avoids the problem of excessive dependence of the control strategy on system parameters caused by the use of voltage vector limiting. At the same time, the parameter design is simple and convenient for engineering practice.

[0153] The embodiments of this application also provide a specific implementation of an electronic device capable of implementing all steps in the transient adaptive control method for matched control type direct-drive wind turbines described in the above embodiments. See [link to implementation details]. Figure 30 The electronic devices specifically include the following:

[0154] Processor 1201, memory 1202, communications interface 1203, and bus 1204;

[0155] The processor 1201, memory 1202, and communication interface 1203 communicate with each other via bus 1204; the communication interface 1203 is used to realize information transmission between server-side devices and client-side devices and other related devices.

[0156] The processor 1201 is used to call the computer program in the memory 1202. When the processor executes the computer program, it implements all the steps in the transient adaptive control method of the matched control type direct drive wind turbine in the above embodiment. For example, when the processor executes the computer program, it implements the following steps:

[0157] Step 100: When the matched control type direct drive wind turbine unit fails, the phase of the matched control type direct drive wind turbine unit is locked through the unloading circuit of the matched control type direct drive wind turbine unit.

[0158] Step 200: When the matched-control direct-drive wind turbine is in a fault period, the reactive power of the matched-control direct-drive wind turbine is determined in real time based on the voltage at the grid connection point of the matched-control direct-drive wind turbine; and

[0159] Step 300: Suppress the transient current component of the matched-control direct-drive wind turbine based on the pre-generated virtual resistor.

[0160] Embodiments of this application also provide a computer-readable storage medium capable of implementing all steps of the transient adaptive control method for matched-control direct-drive wind turbine generators in the above embodiments. The computer-readable storage medium stores a computer program that, when executed by a processor, implements all steps of the transient adaptive control method for matched-control direct-drive wind turbine generators in the above embodiments. For example, when the processor executes the computer program, it implements the following steps:

[0161] Step 100: When the matched control type direct drive wind turbine unit fails, the phase of the matched control type direct drive wind turbine unit is locked through the unloading circuit of the matched control type direct drive wind turbine unit.

[0162] Step 200: When the matched-control direct-drive wind turbine is in a fault period, the reactive power of the matched-control direct-drive wind turbine is determined in real time based on the voltage at the grid connection point of the matched-control direct-drive wind turbine; and

[0163] Step 300: Suppress the transient current component of the matched-control direct-drive wind turbine based on the pre-generated virtual resistor.

[0164] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. In particular, hardware + program embodiments are relatively simple in description because they are fundamentally similar to method embodiments; relevant parts can be referred to the descriptions in the method embodiments.

[0165] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0166] While this application provides method operation steps as shown in the embodiments or flowcharts, more or fewer operation steps may be included based on conventional or non-inventive labor. The order of steps listed in the embodiments is merely one possible execution order among many and does not represent the only execution order. In actual device or client product execution, the method can be executed sequentially as shown in the embodiments or drawings, or in parallel (e.g., in a parallel processor or multi-threaded processing environment).

[0167] For ease of description, the above devices are described in terms of function, divided into various modules. Of course, in implementing the embodiments of this specification, the functions of each module can be implemented in one or more software and / or hardware components, or a module that performs the same function can be implemented by a combination of multiple sub-modules or sub-units. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between devices or units, and may be electrical, mechanical, or other forms.

[0168] Those skilled in the art will also know that, besides implementing the controller using purely computer-readable program code, the same functions can be achieved by logically programming the method steps, making the controller function as logic gates, switches, application-specific integrated circuits (ASICs), programmable logic controllers (PLCs), and embedded microcontrollers. Therefore, such a controller can be considered a hardware component, and the devices within it used to implement various functions can also be considered structures within that hardware component. Alternatively, the devices used to implement various functions can be considered as both software modules implementing the method and structures within a hardware component.

[0169] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0170] Memory may include non-persistent storage 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.

[0171] The embodiments described in this specification can be described in the general context of computer-executable instructions, such as program modules, that are executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform a specific task or implement a specific abstract data type. The embodiments of this specification can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0172] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, system embodiments are basically similar to method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. In the description of this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments in this specification. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0173] The above description is merely an embodiment of the embodiments in this specification and is not intended to limit the embodiments of this specification. For those skilled in the art, various modifications and variations can be made to the embodiments of this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the embodiments of this specification should be included within the scope of the claims of the embodiments of this specification.

Claims

1. A transient adaptive control method for a matched-control type direct-drive wind turbine generator, characterized in that, include: When the matched control type direct drive wind turbine unit fails, the phase of the matched control type direct drive wind turbine unit is locked through the unloading circuit of the matched control type direct drive wind turbine unit. When the matched control type direct drive wind turbine is in a fault period, the reactive power of the matched control type direct drive wind turbine is determined in real time according to the voltage of the grid connection point of the matched control type direct drive wind turbine, so as to provide reactive voltage support and limit the steady-state component of the fault current. as well as Suppress the transient current component of the matched-control direct-drive wind turbine generator based on the pre-generated virtual resistor; The reactive power of the matched-control direct-drive wind turbine is determined in real time based on the voltage at the grid connection point of the matched-control direct-drive wind turbine, including: The nominal value of the reactive current corresponding to the reactive power is determined in real time based on the per-unit value of the voltage at the grid connection point, and is achieved by the following formula: The nominal value of the reactive power command during the fault period is determined in real time based on the nominal value of the d-axis component of the voltage at the grid connection point, and is achieved by the following formula: In the formula, i q The named value representing reactive current. I B The reference value representing the system output current. u s The per-unit value representing the grid connection point voltage. I max This represents the per-unit limit value for the short-circuit current amplitude of the inverter. Q gref_lvrt This indicates the named value of the reactive power command under fault conditions. U sd Indicates the voltage at the grid connection point U s of d Named values ​​of axis components.

2. The transient adaptive control method according to claim 1, characterized in that, Phase locking of the matched control type direct drive wind turbine includes: The DC voltage synchronization link of the matched control type direct drive wind turbine is disconnected by the unloading circuit.

3. The transient adaptive control method of claim 1, wherein, Also includes: When the DC voltage of the matched control type direct drive wind turbine is greater than the DC voltage detection threshold, and the fault voltage of the matched control type direct drive wind turbine is less than the fault voltage detection threshold, it is determined that the matched control type direct drive wind turbine has failed.

4. The transient adaptive control method according to any one of claims 1 to 3, characterized in that, The steps for generating the virtual resistor include: The virtual resistor is determined based on the relationship between the output current of the grid-side inverter of the matched control type direct drive wind turbine and the threshold value of the starting current of the virtual resistor.

5. A transient adaptive control device for a matching control type direct drive wind turbine, characterized in that, include: The unit phase interlocking module is used to interlock the phase of the matched control direct drive wind turbine unit through the unloading circuit of the matched control direct drive wind turbine unit when the matched control type direct drive wind turbine unit fails. The reactive power real-time update module is used to determine the reactive power of the matched control direct drive wind turbine in real time based on the voltage of the grid connection point of the matched control direct drive wind turbine when the matched control direct drive wind turbine is in a fault period, so as to provide reactive voltage support and limit the steady-state component of the fault current. as well as A current transient suppression module is used to suppress the current transient components of the matched control type direct drive wind turbine based on a pre-generated virtual resistance. The reactive power real-time update module includes: The reactive current nominal value determination unit is used to determine the nominal value of the reactive current corresponding to the reactive power in real time based on the per-unit value of the voltage at the grid connection point. The reactive current nominal value determination unit is implemented by the following formula: ； The command name value determination unit is used to determine the name value of the reactive power command during the fault period in real time based on the name value of the d-axis component of the voltage at the grid connection point. The command name value determination unit is implemented by the following formula: In the formula, i q The named value representing reactive current. I B The reference value representing the system output current. u s The per-unit value representing the grid connection point voltage. I max This represents the per-unit limit value for the short-circuit current amplitude of the inverter. Q gref_lvrt This indicates the named value of the reactive power command under fault conditions. U sd Indicates the voltage at the grid connection point U s of d Named values ​​of axis components.

6. The transient adaptive control device according to claim 5, characterized in that The unit phase interlocking module includes: The synchronization link cutoff unit is used to cut off the DC voltage synchronization link of the matched control type direct drive wind turbine through the unloading circuit.

7. The transient adaptive control device of claim 5, wherein, Also includes: The unit fault judgment module is used to determine that the matched control type direct drive wind turbine unit has failed when the DC voltage of the matched control type direct drive wind turbine unit is greater than the DC voltage detection threshold and the fault voltage of the matched control type direct drive wind turbine unit is less than the fault voltage detection threshold.

8. The transient adaptive control device according to any one of claims 5 to 7, characterized in that, Also includes: A virtual resistance generation module is used to generate the virtual resistance, and the virtual resistance generation module includes: A virtual resistor generation unit is used to determine the virtual resistor based on the relationship between the output current of the grid-side inverter of the matched control type direct drive wind turbine and the threshold value of the starting current of the virtual resistor.

9. A computer program product comprising computer programs / instructions, characterized in that, When the computer program / instruction is executed by the processor, it implements the steps of the transient adaptive control method for matched control type direct drive wind turbine generators as described in any one of claims 1 to 4.

10. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the transient adaptive control method for matched control type direct drive wind turbine generators as described in any one of claims 1 to 4.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the steps of the transient adaptive control method for matched control type direct drive wind turbine generators as described in any one of claims 1 to 4.

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