System and method for controlling a wind turbine

Abstract

A system and method for controlling a wind turbine are provided. The wind turbine controller detects transient grid events and generates a torque command via a powertrain damper control module. The torque command is configured to establish a default damping level for torsional vibrations caused by the transient grid events. The controller also determines at least one oscillation parameter related to the torsional vibrations and determines a target generator torque level based on it. The target generator torque level corresponds to an increased damping level for the torsional vibrations relative to the default damping level.

Description

Technical Field

[0001] This disclosure generally relates to wind turbines, and more specifically, to systems and methods for controlling wind turbines in response to transient power grid events. Background Technology

[0002] Wind power is considered one of the cleanest and most environmentally friendly energy sources available today, and wind turbines are receiving increasing attention in this area. A modern wind turbine typically includes a tower, generator, gearbox, nacelle, and one or more rotor blades. The nacelle contains the rotor assembly, which is connected to the gearbox and generator. The rotor assembly and gearbox are mounted on a base support frame located within the nacelle. One or more rotor blades use the known airfoil principle to capture the kinetic energy of the wind. The rotor blades transfer this kinetic energy, in the form of rotational energy, to rotate a shaft that connects the rotor blades to the gearbox, or, if no gearbox is used, directly to the generator. The generator then converts the mechanical energy into electrical energy, which can be transmitted to a converter and / or transformer housed within the tower and subsequently deployed to the public power grid. Modern wind power systems typically take the form of wind farms with multiple such wind turbine generators, which can operate to supply power to a transmission system that provides power to the power grid.

[0003] To supply power to the power grid, wind turbines generally need to meet certain grid requirements. For example, wind turbines may be required to provide fault ride-through (e.g., low-voltage ride-through) capability. This requirement may necessitate that wind turbines remain connected to the power grid during one or more transient grid events, such as grid faults. As used herein, the terms “grid fault,” “fault,” or the like are intended to cover a magnitude of change in grid voltage over a given time period. For example, when a grid fault occurs, the system voltage can drop considerably over a short period (e.g., typically less than 500 milliseconds). Furthermore, grid faults can occur for a variety of reasons, including but not limited to phase conductors connected to the ground (i.e., ground faults), short circuits between phase conductors, lightning and / or storms, and / or accidental transmission line grounding.

[0004] In the past, wind turbines could be immediately disconnected in response to voltage drops. However, as the power output of wind turbines as a percentage of the power grid increases, the need to keep them online and weather transient grid events becomes more critical. However, voltage drops during transient grid events can lead to a significant reduction in generator torque, while the rotor's rotational speed may remain essentially unchanged. In this regard, when the voltage recovers to pre-fault levels, the mismatch between the generator's torque and the rotor's inertia can cause undesirable torsional vibrations in the wind turbine's powertrain. Torsional vibrations can negatively impact the lifespan of various components of the wind turbine. For example, torsional vibrations can exceed the release threshold of sliding couplings, leading to operative decoupling of the rotor from the generator.

[0005] Therefore, the art is constantly seeking new and improved systems and methods to solve the aforementioned problems. In this regard, this disclosure relates to systems and methods for controlling wind turbines to manage torsional vibrations caused by transient power grid events. Summary of the Invention

[0006] Aspects and advantages of the invention will be set forth in part in the description which follows, or may be apparent from the description, or may be learned by practice of the invention.

[0007] In one aspect, this disclosure relates to a method for controlling a wind turbine. The wind turbine may have a power transmission system including a rotor rotatably coupled to a generator via a sliding coupler. The method may include detecting a first transient grid event via a controller. Furthermore, the method may include generating a torque command via a power transmission system damper control module of the controller in response to the first transient grid event. The torque command may be configured to establish a default damping level for torsional vibrations caused by the first transient grid event. Furthermore, the method may include determining at least one oscillation parameter related to the torsional vibrations via the controller. Furthermore, the method may include determining a target generator torque level via the controller in response to the determination of the oscillation parameter(s). The target generator torque level may be a torque level corresponding to an increased damping level for torsional vibrations greater than the default damping level. Furthermore, the method may include modifying the torque command using a torque modifier command generated via the controller to establish the generator torque at the target generator torque level, thereby producing an increased damping level.

[0008] In an embodiment, the first transient grid event may be a low-voltage ride-through event.

[0009] In an additional embodiment, the low-voltage ride-through event may be characterized by a voltage drop that is at least 50% and less than or equal to 70% of the pre-transient grid event voltage.

[0010] In yet another embodiment, the oscillation parameters may depend on a plurality of transient event parameters. These transient event parameters may include the power level prior to the first transient grid event, the grid voltage during the first transient grid event, and the duration of the first transient grid event.

[0011] In another embodiment, determining the oscillation parameters may further include receiving data via a controller indicating at least one of the transient event parameters. The data may also include missing indications corresponding to at least one additional parameter among the transient event parameters. Furthermore, the method may include determining estimated values ​​for the additional parameters via the controller through estimation of the additional parameters.

[0012] In an embodiment, the oscillation parameters may include peak shaft torque, torsional vibration frequency, and / or torsional vibration duration.

[0013] In an additional embodiment, the increased damping level can reduce peak shaft torque, torsional vibration frequency, and / or torsional vibration duration.

[0014] In another embodiment, modifying the torque command using a torque modifier command may include detecting, via a controller, oscillation parameters(s) approaching an activation threshold. Approaching the activation threshold may result in modification of the torque command.

[0015] In another embodiment, determining the target generator torque level may include determining the nominal release threshold of the sliding coupler. The method may also include establishing the target generator torque level at an amount less than the nominal release threshold of the sliding coupler in order to maintain the traction of the sliding coupler.

[0016] In one embodiment, in response to an increased damping level, the method may include achieving a sustained shaft torque level within a deviation of the shaft torque level prior to the first grid event. This sustained shaft torque level is achieved before detecting the second transient grid event.

[0017] In an additional embodiment, generating the torque modifier command may include receiving multiple operating parameters from the rotor and generator via a controller. The controller may filter the multiple operating parameters at multiple powertrain torsional frequencies to generate a filtered torsional information dataset. The controller may multiply the filtered torsional information dataset by at least one control gain.

[0018] In yet another embodiment, the control gain may include proportional gain, integral gain, derivative gain, and / or combinations thereof.

[0019] In another aspect, this disclosure relates to a system for controlling a wind turbine. The system may include a generator rotatably coupled to a rotor via a sliding coupler, and a controller communicatively coupled to the generator. The controller may include at least one processor configured to perform a plurality of operations. The plurality of operations may include any of the operations and / or features described herein.

[0020] These and other features, aspects, and advantages of the present invention will become more readily understood with reference to the following description and the appended claims. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0021] Technical Solution 1. A method for controlling a wind turbine coupled to a power grid, the wind turbine having a power transmission system including a rotor rotatably coupled to a generator via a sliding coupler, the method comprising:

[0022] The first transient power grid event is detected via the controller;

[0023] In response to the first transient power grid event, a torque command is generated via the powertrain damper control module of the controller, the torque command being configured to establish a default damping level for torsional vibrations caused by the first transient power grid event;

[0024] At least one oscillation parameter related to the torsional vibration is determined via the controller;

[0025] In response to the determination of the at least one oscillation parameter, a target generator torque level is determined via the controller, the target generator torque level being a torque level corresponding to an increased damping level of the torsional vibration greater than the default damping level; and

[0026] The torque command is modified using a torque modifier command generated via the controller to establish the generator torque at the target generator torque level, thereby producing the increased damping level.

[0027] Technical Solution 2. The method according to Technical Solution 1, wherein the first transient power grid event includes a low voltage ride-through event.

[0028] Technical Solution 3. The method according to Technical Solution 2, wherein the low voltage ride-through event is characterized by a voltage drop, the voltage drop being at least 50% of the pre-transient grid event voltage and less than or equal to 70% of the pre-transient grid event voltage.

[0029] Technical Solution 4. The method according to Technical Solution 1, wherein the oscillation parameter depends on a plurality of transient event parameters, the plurality of transient event parameters including the power level before the first transient grid event, the grid voltage during the first transient grid event, and the duration of the first transient grid event.

[0030] Technical Solution 5. The method according to Technical Solution 4, wherein determining the oscillation parameters further includes:

[0031] The controller receives data indicating at least one of the plurality of transient event parameters, wherein the data further includes indications of the absence of at least one additional parameter corresponding to the plurality of transient event parameters; and

[0032] An estimated value for the at least one additional parameter is determined via the controller through the estimation of the at least one additional parameter.

[0033] Technical Solution 6. The method according to Technical Solution 4, wherein the oscillation parameters include at least one of peak shaft torque, torsional vibration frequency, and torsional vibration duration.

[0034] Technical Solution 7. The method according to Technical Solution 6, wherein the increased damping level reduces at least one of the peak shaft torque, the torsional vibration frequency, and the torsional vibration duration.

[0035] Technical Solution 8. The method according to Technical Solution 1, wherein modifying the torque command using the torque modifier command further includes:

[0036] The controller detects that the oscillation parameter approaches an activation threshold, wherein the approach of the activation threshold leads to the modification of the torque command.

[0037] Technical Solution 9. The method according to Technical Solution 1, wherein determining the target generator torque level further includes:

[0038] Determine the nominal release threshold of the sliding coupler; and

[0039] The target generator torque level is set at a value less than the nominal release threshold of the sliding coupler in order to maintain the traction of the sliding coupler.

[0040] Technical Solution 10. The method according to Technical Solution 1, the method further comprising, in response to the increased damping level, achieving a sustained shaft torque level within a deviation of the shaft torque level prior to the first transient power grid event, wherein the sustained shaft torque level is achieved prior to detecting the second transient power grid event.

[0041] Technical Solution 11. The method according to Technical Solution 1, wherein generating the torque modifier command further includes:

[0042] The controller receives multiple operating parameters for at least one of the rotor and the generator.

[0043] The controller filters multiple operating parameters at multiple powertrain torsional frequencies to generate a filtered torsional information dataset; and

[0044] The filtered torsional information dataset is multiplied by at least one control gain via the controller.

[0045] Technical Solution 12. The method according to Technical Solution 11, wherein the at least one control gain includes at least one of proportional gain, integral gain, derivative gain, and combinations thereof.

[0046] Technical Solution 13. A system for controlling a wind turbine, the system comprising:

[0047] A generator, rotatably connected to a rotor via a sliding coupler; and

[0048] A controller communicatively coupled to the generator, the controller including at least one processor configured to perform a plurality of operations, the plurality of operations including:

[0049] Detecting the first transient power grid event,

[0050] In response to the first transient power grid event, a torque command is generated via the powertrain damper control module of the controller. This torque command is configured to establish a default damping level for torsional vibrations caused by the first transient power grid event.

[0051] Determine at least one oscillation parameter related to the torsional vibration.

[0052] In response to the determination of the at least one oscillation parameter, a target generator torque level is determined, the target generator torque level being a torque level corresponding to an increased damping level of the torsional vibration greater than the default damping level, and

[0053] The torque command is modified using a torque modifier command generated via the controller to establish the generator torque at the target generator torque level, thereby producing the increased damping level.

[0054] Technical Solution 14. The system according to Technical Solution 13, wherein the first transient power grid event includes a low voltage ride-through event, the low voltage ride-through event being characterized by a voltage drop, the voltage drop being at least 50% of the pre-transient power grid event voltage and less than or equal to 70% of the pre-transient power grid event voltage.

[0055] Technical Solution 15. The system according to Technical Solution 13, wherein the oscillation parameter depends on a plurality of transient event parameters, the plurality of transient event parameters including the power level prior to the first power grid transient event, the power grid voltage during the first transient power grid event, and the duration of the first transient power grid event, and wherein the oscillation parameter includes at least one of peak shaft torque, torsional vibration frequency, and torsional vibration duration.

[0056] Technical Solution 16. The system according to Technical Solution 15, wherein the increased damping level reduces at least one of the peak shaft torque, torsional vibration frequency, and torsional vibration duration.

[0057] Technical Solution 17. The system according to Technical Solution 13, wherein modifying the torque command using the torque modifier command further includes:

[0058] The oscillation parameter is detected to be close to an activation threshold, wherein the proximity of the activation threshold results in the modification of the torque command.

[0059] Technical Solution 18. The system according to Technical Solution 13, wherein determining the target generator torque level further includes:

[0060] Determine the nominal release threshold of the sliding coupler; and

[0061] The target generator torque level is set at a value less than the nominal release threshold of the sliding coupler in order to maintain the traction of the sliding coupler.

[0062] Technical Solution 19. The system according to Technical Solution 13, wherein the plurality of operations further includes, in response to the increased damping level, achieving a sustained shaft torque level within a deviation of the shaft torque level prior to the first power grid transient event, wherein the sustained shaft torque level is achieved prior to the detection of the second transient power grid event.

[0063] Technical Solution 20. The system according to Technical Solution 13, wherein generating the torque modifier command further includes:

[0064] Receive multiple operating parameters of the rotor or the generator;

[0065] Filtering the multiple operating parameters at the torsional frequencies of multiple powertrain systems to generate a filtered torsional information dataset; and

[0066] The filtered torsional information dataset is multiplied by at least one control gain, wherein the at least one control gain includes at least one of proportional gain, integral gain, derivative gain, and combinations thereof. Attached Figure Description

[0067] The complete and practicable disclosure of the invention, including its best mode for those skilled in the art, is set forth in the description with reference to the accompanying drawings, in which:

[0068] Figure 1 A perspective view showing one embodiment of a wind turbine according to the present disclosure;

[0069] Figure 2 A perspective interior view of one embodiment of the nacelle of a wind turbine according to the present disclosure is shown;

[0070] Figure 3 A schematic diagram of one embodiment of a power transmission system for a wind turbine according to the present disclosure is shown;

[0071] Figure 4 A schematic diagram of one embodiment of an electrical system for use with a wind turbine is shown in accordance with the present disclosure;

[0072] Figure 5 A block diagram illustrating one embodiment of a controller for use with a wind turbine, according to the present disclosure;

[0073] Figure 6 A flowchart illustrating an embodiment of the control logic for a system for controlling a wind turbine according to the present disclosure is shown; and

[0074] Figure 7 A diagram illustrating damped torsional vibration according to this disclosure is shown.

[0075] The repeated use of reference characters in this specification and drawings is intended to indicate the same or similar features or elements of the invention. Detailed Implementation

[0076] Reference will now be made in detail to embodiments of the invention, one or more of which are illustrated in the accompanying drawings. Each example is provided by way of illustration and not by way of limitation. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made to the invention without departing from the scope or spirit of the invention. For example, a feature shown or described as part of one embodiment may be used with another embodiment to produce yet another embodiment. Therefore, it is intended that the invention cover such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0077] As used in this article, the terms “first,” “second,” and “third” are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of an independent component.

[0078] The terms “connection,” “fixation,” “attachment to,” etc., refer to direct connection, fixation, or attachment, as well as indirect connection, fixation, or attachment of both through one or more intermediate components or features, unless otherwise specified herein.

[0079] As used herein throughout the specification and claims, approximate language is applied to modify any quantitative expression that can be permissibly changed without causing a change in the essential functional aspects it addresses. Therefore, values ​​modified by one or more terms (such as “approximately,” “about,” and “roughly”) are not limited to the specified precise values. In at least some cases, approximate language may correspond to the precision of the instrument used to measure the value, or the precision of the method or machine used to construct or manufacture the component and / or system. For example, approximate language may refer to a range of 10%.

[0080] Throughout the specification and claims, scope limitations are combined and interchanged, and such scopes are identified and include all subscopes contained therein, unless the context or language indicates otherwise. For example, all scopes disclosed herein include endpoints, and endpoints can be combined independently of each other.

[0081] Generally, this disclosure relates to systems and methods for controlling wind turbines to increase the efficiency of powertrain damper (DTD) control systems in order to rapidly dampen torsional vibrations caused by transient grid events. Typically, wind turbines utilize torque generated by a generator to counteract torque generated by the rotor in response to wind. Many modern wind turbines employ generators (such as doubly-fed induction generators (DFIGs)) that utilize grid power for generator torque generation. At the onset of a transient grid event (such as a low-voltage ride-through (LVRT) event), grid power can suddenly decrease, resulting in a corresponding decrease in generator torque. However, due to inertia and / or the effects of wind, the rotor can continue to rotate at the same speed, and in some cases, can accelerate without significant resistance from the generator torque. When the transient grid event ends and grid power recovers, the generator can rapidly return to the generated generator torque to restore the wind turbine to a power-generating state. However, within the powertrain of the wind turbine, the generator torque may encounter torque caused by the rotor's rotation. This encounter can generate torsional vibrations within the powertrain. A DTD control system can be used to rapidly dampen the resulting torsional vibrations. Depending on the severity of the oscillations caused by transient power grid events, this disclosure can increase the damping level of torsional vibrations. Therefore, the systems and methods of this disclosure can increase the efficiency of the DTD control system.

[0082] Specifically, this disclosure includes systems and methods for detecting transient power grid events and generating torque commands in response. The torque command may be based on a default damping level for torsional vibrations generated during recovery from the transient power grid event. The severity of the torsional vibrations may be indicated by at least one oscillation parameter. The oscillation parameter may depend on transient event parameters. For example, transient event parameters may include the power level prior to the transient power grid event, the grid voltage during the transient power grid event, and / or the duration of the transient power grid event. Based on the relationship between the transient event parameters and the oscillation parameter, the severity of the torsional vibrations may be indicated by the peak shaft torque, the torsional vibration frequency, and / or the torsional vibration duration. If guaranteed by the severity of the torsional vibrations, the controller may modify the initial torque command to increase the damping level above the default damping level. In this regard, the control system may be implemented as a switchable function whose activation depends on the characteristics of the transient power grid event. Furthermore, the modification of the initial torque command may be notified by certain structural limitations of the wind turbine. For example, the controller may limit the torque command to a level that does not exceed the release threshold of the sliding coupling of the powertrain.

[0083] Therefore, this disclosure proposes novel control techniques that can improve the reliability and damping capability of wind turbines by using existing measurements and generator speed measurements during transient grid events. In this regard, the damping characteristics of wind turbines can be improved compared to conventional powertrain damping control systems. Furthermore, the control techniques can reduce connector slippage, thereby improving the reliability of wind turbines during transient grid events. This can then be used to meet grid specification requirements related to single and / or multiple fault ride-through events. The systems and methods disclosed herein may also be implemented without any additional measurements or hardware changes. In fact, if measurements are unavailable, estimation methods can be used to generate the required variables. Furthermore, it should be recognized that systems and methods can be used to limit torsional vibrations that can be caused by extreme wind conditions, such as gusts, resonant wind excitation, blade pass-through frequency excitation, and / or emergency stops.

[0084] Now refer to the attached diagram, Figure 1 A perspective view of one embodiment of a wind turbine 100 according to the present disclosure is shown. As shown, the wind turbine 100 generally includes a tower 102 extending from a support surface 104, a nacelle 106 mounted on the tower 102, and a rotor 108 coupled to the nacelle 106. The rotor 108 includes a rotatable hub 110 and at least one rotor blade 112 coupled to and extending outward from the hub 110. For example, in the illustrated embodiment, the rotor 108 includes three rotor blades 112. However, in alternative embodiments, the rotor 108 may include more or fewer than three rotor blades 112. Each rotor blade 112 may be spaced around the hub 110 to facilitate the rotation of the rotor 108 so that kinetic energy can be converted from wind into usable mechanical energy, and subsequently into electrical energy. For example, the hub 110 may be rotatably coupled to an electrical system 150 located within the nacelle 106. Figure 2 ) generator 118 ( Figure 2 ), to allow the generation of electrical energy.

[0085] The wind turbine 100 may also include a controller 200 centralized within the nacelle 106. However, in other embodiments, the controller 200 may be located within any other component of the wind turbine 100 or at a location outside the wind turbine. Furthermore, the controller 200 may be communicatively coupled to any number of components of the wind turbine 100 to control those components. In this regard, the controller 200 may include a computer or other suitable processing unit. Thus, in several embodiments, the controller 200 may include suitable computer-readable instructions that, when implemented, configure the controller 200 to perform various functions, such as receiving, sending, and / or executing wind turbine control signals.

[0086] Now refer to Figure 2-4 A simplified interior view of one embodiment of the cabin 106, a schematic diagram of one embodiment of the powertrain 146, and... Figure 1 An exemplary electrical system 150 of a wind turbine 100 is shown. As shown, a generator 118 may be coupled to a rotor 108 to generate electrical power from rotational energy generated by the rotor 108. For example, as shown in the illustrated embodiment, the rotor 108 may include a rotor shaft 122 coupled to a hub 110 for rotation therewith. The rotor shaft 122 may be rotatably supported by a main bearing 144. The rotor shaft 122 may then be rotatably coupled to a high-speed shaft 124 of the generator 118 via an optional gearbox 126, the optional gearbox 126 being connected to a base support frame 136 by one or more torque arms 142. As generally understood, the rotor shaft 122 may provide a low-speed, high-torque input to the gearbox 126 in response to rotation of the rotor blades 112 and the hub 110. The gearbox 126 may then be configured with a plurality of gears 148 to convert a low-speed, high-torque input into a high-speed, low-torque output to drive the high-speed shaft 124 and thus the generator 118. In an embodiment, the gearbox 126 may be configured with a plurality of gear ratios to produce varying rotational speeds of the high-speed shaft for a given low-speed input, or vice versa.

[0087] In this embodiment, rotor 108 may be slowed by torque generated by generator 118. Because generator 118 generates torque opposite to the rotation of rotor 108, high-speed shaft 124 may be equipped with a sliding coupling 154. Sliding coupling 154 prevents damage to components of powertrain 146 due to overload. In this regard, sliding coupling 154 may have a release threshold or traction force above which allows the first portion 162 and the second portion 164 of high-speed shaft 124 to rotate at different speeds. It should be understood that if the torsional torque at sliding coupling 154 exceeds the release / traction threshold, generator 118 may be communicatively decoupled from rotor 108. In such cases, the torque generated by generator 118 may be unavailable for slowing rotor 108, or the increased rotational speed of rotor 108 may be unavailable for increasing power production.

[0088] Each rotor blade 112 may also include a pitch control mechanism 120 configured to rotate the rotor blade 112 about its pitch axis 116. Each pitch control mechanism 120 may include a pitch drive motor 128 (e.g., any suitable electric, hydraulic, or pneumatic motor), a pitch drive gearbox 130, and a pitch drive pinion 132. In such embodiments, the pitch drive motor 128 may be coupled to the pitch drive gearbox 130 to apply mechanical force to the pitch drive gearbox 130. Similarly, the pitch drive gearbox 130 may be coupled to the pitch drive pinion 132 for rotation therewith. The pitch drive pinion 132 may then be rotatably engaged with a pitch bearing 134, which connects the hub 110 and the corresponding rotor blade 112, such that rotation of the pitch drive pinion 132 causes rotation of the pitch bearing 134. Therefore, in such embodiments, the rotation of the pitch drive motor 128 drives the pitch drive gearbox 130 and the pitch drive pinion 132, thereby causing the pitch bearing 134 and the rotor blades(s)112 to rotate about the pitch axis 116. Similarly, the wind turbine 100 may include one or more yaw drive mechanisms 138 communicatively coupled to the controller 200, wherein each(s) yaw drive mechanism(s)138 is configured to change the angle of the nacelle 106 relative to the wind (e.g., by engaging the yaw bearing 140 of the wind turbine 100).

[0089] Special reference Figure 2 In an embodiment, the wind turbine 100 may include at least one operating sensor 158. The operating sensors 158 may be configured to detect the performance of the wind turbine 100, for example, in response to environmental conditions. For example, the operating sensors 158 may be rotational speed sensors operatively coupled to the controller 200. The operating sensors 158 may be directed toward the rotor shaft 122 of the wind turbine 100 and / or the generator 118. The operating sensors 158 may collect data indicating the rotational speed and / or rotational position of the rotor shaft 122, and thus data indicating the rotor 108 in the form of rotor speed and / or rotor azimuth angle. In an embodiment, the operating sensors 158 may be analog tachometers, DC tachometers, AC tachometers, digital tachometers, contact tachometers, non-contact tachometers, or time-frequency tachometers. In an embodiment, the operating sensors 158 may be, for example, encoders, such as optical encoders. In an embodiment, the operating sensors 158 may be configured to monitor operating parameters 338 of the wind turbine 100. Figure 6 ).

[0090] Furthermore, in embodiments, the wind turbine 100 may include at least one grid sensor 160 or be operatively coupled to at least one grid sensor 160, said at least one grid sensor 160 being configured to monitor at least one parameter of the power of the power grid 179. For example, the grid sensor(s) 160 may be configured to continuously monitor the voltage of the power grid 179 as experienced by the wind turbine 100. Thus, in embodiments, the grid sensor(s) 160 may be an ammeter, voltmeter, ohmmeter, and / or any other suitable sensor for monitoring the power of the power grid 179.

[0091] It should also be recognized that, as used herein, the term "monitor" and its variations indicate that the various sensors of the wind turbine 100 can be configured to provide direct or indirect measurements of the monitored parameters. Thus, the sensors described herein can, for example, be used to generate signals relating to the monitored parameters, which can then be utilized by the controller 200 to determine the condition or response of the wind turbine 100.

[0092] Special reference Figure 4 In embodiments, electrical system 150 may include various components for converting the kinetic energy of rotor 108 into an acceptable electrical output to a connected power grid 179. For example, in an embodiment, generator 118 may be a doubly fed induction generator (DFIG) having a stator 117 and a generator rotor 119. Generator 118 may be coupled to stator bus 166 and power converter 168 via rotor bus 170. In such a configuration, stator bus 166 provides multiphase power output (e.g., three-phase power) from the stator of generator 118, and rotor bus 170 provides multiphase power output (e.g., three-phase power) from the generator rotor 119 of generator 118. Furthermore, generator 118 may be coupled to rotor-side converter 172 via rotor bus 170. Rotor-side converter 172 may be coupled to line-side converter 174, which in turn may be coupled to line-side bus 176.

[0093] In this embodiment, the rotor-side converter 172 and the line-side converter 174 can be configured for normal operation in a three-phase pulse-width modulation (PWM) arrangement that uses insulated-gate bipolar transistors (IGBTs) as switching devices. Other suitable switching devices can be used, such as insulated-gate commutated thyristors, MOSFETs, bipolar transistors, silicon controlled rectifiers, and / or other suitable switching devices. The rotor-side converter 172 and the line-side converter 174 can be coupled across (may be) a DC link capacitor 175 via a DC link 173.

[0094] In one embodiment, the power converter 168 may be coupled to a controller 200, which is configured as a converter controller 202 to control the operation of the power converter 168. For example, the converter controller 202 may send control commands to the rotor-side converter 172 and the line-side converter 174 to control the modulation of the switching elements used in the power converter 168 to establish a desired generator torque setpoint and / or power output.

[0095] like Figure 4 As further described herein, in an embodiment, electrical system 150 may include transformer 178 that couples wind turbine 100 to power grid 179. In an embodiment, transformer 178 may be a three-winding transformer, including a high-voltage (e.g., greater than 12 kVAC) primary winding 180. The high-voltage primary winding 180 may be coupled to power grid 179. Transformer 178 may also include a medium-voltage (e.g., 6 kVAC) secondary winding 182 coupled to stator bus 166, and a low-voltage (e.g., 575 VAC, 690 VAC, etc.) auxiliary winding 184 coupled to line bus 176. It should be recognized that transformer 178 may be a three-winding transformer as depicted, or alternatively, a two-winding transformer having only a primary winding 180 and a secondary winding 182; a four-winding transformer having a primary winding 180, a secondary winding 182, and an auxiliary winding 184 as well as additional auxiliary windings; or may have any other suitable number of windings.

[0096] In embodiments, the electrical system 150 may further include various circuit breakers, fuses, contactors, and other devices to control and / or protect various components of the electrical system 150. For example, in embodiments, the electrical system 150 may include a mains circuit breaker 188, a stator bus circuit breaker 190, and / or a line bus circuit breaker 192. When the condition of the electrical system 150 approaches its operating threshold, the circuit breakers(s) 188, 190, 192 of the electrical system 150 may connect or disconnect the corresponding components of the electrical system 150.

[0097] Still refer to Figure 4 And also refer to Figure 5-7 Several embodiments of a system 300 for controlling a wind turbine 100 according to this disclosure are presented. For example... Figure 5The diagram specifically illustrates an embodiment of suitable components that may be included within system 300. For example, as shown, system 300 may include a controller 200 communicatively coupled to (a plurality of) operational sensors 158 and (a plurality of) grid sensors 160. Furthermore, as shown, controller 200 includes one or more processors 206 and associated storage devices 208 configured to perform various computer-implemented functions (e.g., performing methods, steps, calculations, etc., and storing related data, as disclosed herein). Additionally, controller 200 may include a communication module 210 to facilitate communication between controller 200 and various components of wind turbine 100. Furthermore, communication module 210 may include a sensor interface 212 (e.g., one or more analog-to-digital converters) to allow signals transmitted from (a plurality of) sensors 158, 160 to be converted into signals that can be understood and processed by processor 206. It should be appreciated that (a plurality of) sensors 158, 160 may be communicatively coupled to communication module 210 using any suitable means. For example, sensors 158, 160 may be coupled to sensor interface 212 via a wired connection. However, in other embodiments, sensors 158, 160 may be coupled to sensor interface 212 via a wireless connection, such as by using any suitable wireless communication protocol known in the art. Furthermore, communication module 210 may also be operatively coupled to operating state control module 214, which is configured to change the operating state of at least one wind turbine.

[0098] As used herein, the term "processor" refers not only to integrated circuits known in the art as included in a computer, but also to controllers, microcontrollers, microcomputers, programmable logic controllers (PLCs), application-specific integrated circuits (ASICs), and other programmable circuits. Furthermore, the storage device(s) 208 may generally include storage elements, including but not limited to computer-readable media (e.g., random access memory (RAM)), computer-readable non-volatile media (e.g., flash memory), floppy disks, optical disc read-only memory (CD-ROM), magneto-optical discs (MOD), digital versatile optical discs (DVDs), and / or other suitable storage elements. Such storage devices 208 may be generally configured to store suitable computer-readable instructions that, when implemented by the processor(s) 206, configure the controller 200 to perform various functions (including, but not limited to, detecting transient power grid events and modifying torque commands to produce increased damping of torsional vibrations of the wind turbine 100 as described herein), and various other suitable computer-implemented functions.

[0099] Special reference Figure 6 and Figure 7In an embodiment, the controller 200 of system 300 may be configured to detect a transient power grid event 302, which may be a first transient power grid event 303. In response to the transient power grid event 302, the controller 200 may generate a torque command 304 via a powertrain damper control module 216. The torque command 304 may establish a default damping level 306 for the torsional vibration (V) caused by the transient power grid event 302. Furthermore, in an embodiment, the controller 200 may determine at least one oscillation parameter 308 related to the torsional vibration (V). In response to this determination, in an embodiment, the controller 200 may determine a target generator torque level 310. The target generator torque level 310 may be a torque level corresponding to an increased damping level 312 for the torsional vibration (V) relative to the default damping level 306. As depicted at 314, the controller 200 may modify the torque command 304 using a torque modifier command 316. At 318, modifying the torque command 304 using the torque modifier command 316 facilitates the establishment of the generator 118 at the target generator torque level 310, thereby resulting in an increased damping level 312. It should be understood that, in this embodiment, the increased damping level 312 can be achieved during the transient grid event recovery phase (R) following the transient grid event 302. GE )maintain.

[0100] In an embodiment, transient grid event 302 may be a low-voltage ride-through (LVRT) event. An LVRT event may be characterized by a voltage drop, which is a pre-transient grid event (P... GE At least 50% of the voltage. In an additional embodiment, the voltage drop may be less than or equal to the pre-transient grid event (P). GE 70% of the voltage. It should be recognized that, in the embodiment, the transient grid event 302 sustains the pre-transient grid event (P) throughout the transient grid event 302. GE At least 30% of the voltage can facilitate the recovery of the wind turbine 100 from transient grid event 302, because the maintained voltage provides initial resistance, which, when counteracted, generates and increases generator torque. However, it should be further appreciated that, in additional embodiments, the LVRT event may be characterized by different voltage level variations (as required by local grid specifications). For example, in an embodiment, the LVRT event may be characterized by a voltage drop, which is a pre-transient grid event (P... GE At least 10% of the voltage. In an additional embodiment, the voltage drop may be less than or equal to the pre-transient grid event (P). GE 80% of the voltage.

[0101] Transient grid event 302 may be defined according to a plurality of transient event parameters 320. In an embodiment, the plurality of transient event parameters 320 may, for example, indicate the severity of transient grid event 302. Transient event parameters 320 may include the power level of power grid 179 prior to transient grid event 302 (e.g., pre-transient grid event (P)). GE (voltage). In an embodiment, transient event parameter 320 may further include the grid voltage during transient grid event 302 (e.g., the pre-transient grid event (P)). GE (at least 30% of the voltage). Furthermore, in an embodiment, the transient event parameter 320 may include the duration of the transient power grid event 302.

[0102] In embodiments where torsional vibration (V) is caused by transient power grid event 302, the severity of torsional vibration (V) can be indicated by oscillation parameters(V)(s). Therefore, oscillation parameters(V)(s ...

[0103] As a description of the torsional vibration (V) caused by the transient grid event 302, in an embodiment, the oscillation parameters 308 may include data indicating the peak shaft torque 324. In an embodiment, the peak shaft torque 324 may be the internal torque (e.g., torque) of the high-speed shaft 124, which is generated based on the torque load transmitted from the rotor 108 and the generator 118. In an embodiment, the peak shaft torque 324 may be the torque level experienced by the sliding coupler 154. In an embodiment, the peak shaft torque 324 may be proportional to the multiplicative inverse of the pre-fault power level of the grid 179, the duration of the transient grid event 302, and / or the multiplicative inverse of the grid voltage remaining throughout the transient grid event 302. Therefore, the peak shaft torque 324 of the torsional vibration (V) may be determined via an algorithm based on the transient event parameters 320. It should be appreciated that, in an embodiment, the increased damping level 312 may reduce the peak shaft torque 324, as depicted at 325.

[0104] In one embodiment, the oscillation parameters(s) 308 may include data indicating the torsional vibration frequency 326. In an additional embodiment, the oscillation parameters(s) 308 may also include data indicating the torsional vibration duration 328. It should be understood that each of the torsional vibration frequency 326 and torsional vibration duration 328 may be subject to limitations imposed by the power grid 179. Therefore, as depicted at 325, in one embodiment, the increased damping level 312 may facilitate the fulfillment of power grid demands by reducing the torsional vibration frequency 326 and / or the torsional vibration duration 328.

[0105] (Multiple) oscillation parameters 308 are available Figure 7 The above is graphically represented by curves C1 and C2. As depicted, curve C1 may represent the oscillation parameters 308(s) of the powertrain 146, which are generated in response to a transient power grid event 302 when subjected to a default damping level 306. Conversely, curve C2 may represent the effect of an increased damping level 312 on the oscillation parameters 308. As depicted, in an embodiment, the increased damping level 312 may reduce the peak shaft torque 324 and the transient power grid event recovery phase (R... GE The duration of the damping. In other words, the increased damping level 312 facilitates a faster recovery of the wind turbine 100’s stabilization operation, which can then be achieved via the default damping level 306 of the DTD control module 216.

[0106] like Figure 6 Depicted at 330, in an embodiment, the controller 200 of system 300 may be configured to detect the approach of oscillation parameters(308) to activation threshold 332. When the value of oscillation parameter(308) exceeds activation threshold 332, the torque command 304 generated by DTD control module 216 may be modified to establish generator torque at target level 310. It should be appreciated that activation threshold 332 may correspond to the value of oscillation parameter(308), indicating that the increased damping level 312 is a torsional vibration (V) of the desired magnitude, frequency, and / or duration. It should be further appreciated that in embodiments where transient grid event 302 causes torsional vibration (V) (the oscillation parameter 308 of torsional vibration (V) does not exceed activation threshold 332), default damping level 306 may be applied throughout the transient grid event recovery phase (R GE )maintain.

[0107] To ensure the rotor 108 cycles and the transient power grid event recovery phase (R GETo maintain operative coupling to generator 118 via sliding coupler 154, in an embodiment, controller 200 may be configured to determine a nominal release threshold 334 for sliding coupler 154. The nominal release threshold 334, or traction force, may be a maximum torque value above which sliding coupler 154 may be configured to allow different rotational speeds for the first portion 162 and the second portion 164 of high-speed shaft 124, thereby communicatively decoupling generator 118 from rotor 108. Therefore, as depicted at 336, in an embodiment, controller 200 may establish a target generator torque level 310 at a value less than the nominal release threshold 334 of sliding coupler 154. For example, in an embodiment, target generator torque level 310 may be established at a value that ensures peak shaft torque 324 does not exceed the nominal release threshold 334. It should be recognized that, due to the communication decoupling between the generator 118 and the rotor 108, exceeding the nominal release threshold 334 may result in the inability to generate an increased damping level 312. Therefore, setting the target generator torque level 310 at a value that meets the nominal release threshold 334 ensures that, under the assumed conditions and operating states of the wind turbine 100, maximum damping can be generated.

[0108] In an embodiment, generating torque modifier command 316 may include receiving data from (a plurality of) operation sensors 158 indicating a plurality of operation parameters 338. The plurality of operation parameters 338 may correspond to operation parameters of rotor 108 and / or generator 118. For example, the plurality of operation parameters 338 may indicate rotor speed, rotor angular displacement, rotor angular acceleration, generator speed, generator angular displacement, and / or generator angular acceleration.

[0109] As depicted at 340, in an embodiment, the controller 200 of system 300 may be configured to filter multiple operating parameters 338 at multiple powertrain torsional frequencies 342. In an embodiment, the multiple powertrain torsional frequencies 342 may correspond to multiple natural frequencies of the torsional system. For example, the multiple powertrain torsional frequencies 342 may correspond to the fundamental frequency and corresponding harmonic frequencies of the high-speed shaft 124. Filtering of the operating parameters 338 may generate a filtered torsional information dataset 344. Filtering may be performed, for example, via any suitable filtering device, such as a bandpass filter or a wavelet filter.

[0110] As depicted at 346, in an embodiment, controller 200 may be configured to multiply the filtered torsional information dataset 344 by at least one control gain 348 to generate a torque modifier command 316. In an embodiment, the control gain(s) 348 may be a proportional gain, an integral gain, a derivative gain, and / or a combination thereof.

[0111] In an embodiment, transient grid event 302 may be followed by a second transient grid event 350. In such an embodiment, as depicted at 352, system 300 may achieve a sustained shaft torque level within a deviation 354 of the pre-grid event shaft torque level 356 prior to the first transient grid event 303 via an increased damping level 312. It should be appreciated that achieving a sustained shaft torque level within a deviation 354 of the pre-grid event shaft torque level 356 prior to the occurrence of the second transient grid event 350 facilitates compliance with power grid requirements. It should be further appreciated that, in an embodiment, grid regulation may make it necessary to achieve the sustained shaft torque level within a deviation 354 of the pre-grid event shaft torque level 356 for a specified period of time after the LVRT event.

[0112] Furthermore, those skilled in the art will recognize the interchangeability of various features from different embodiments. Similarly, based on the principles of this disclosure, the various method steps and features described, as well as other known equivalents for each such method and feature, can be mixed and matched by those skilled in the art to construct additional systems and techniques. It will be understood, of course, that not all such objects or advantages described above may necessarily be achieved according to any particular embodiment. Therefore, for example, those skilled in the art will recognize that the systems and techniques described herein may be implemented or practiced in a manner that achieves or optimizes one or a set of advantages as taught herein, without necessarily achieving other objects or advantages as may be taught or suggested herein.

[0113] This written description uses examples to disclose the invention (including the best mode) and also enables any person skilled in the art to practice the invention (including making and using any device or system and performing any incorporated method). The patentable scope of the invention is defined by the claims and may include other examples that may occur to a person skilled in the art. Such other examples are intended to be within the scope of the claims if they include structural elements that are not different from the literal language of the claims, or if they include equivalent structural elements that are not significantly different from the literal language of the claims.

[0114] Further aspects of the invention are provided by the subject matter of the following provisions:

[0115] Clause 1. A method for controlling a wind turbine coupled to a power grid, the wind turbine having a power transmission system including a rotor rotatably coupled to a generator via a sliding coupler, the method comprising: detecting a first transient grid event via a controller; generating a torque command via a power transmission system damper control module of the controller in response to the first transient grid event, the torque command being configured to establish a default damping level for torsional vibrations caused by the first transient grid event; determining at least one oscillation parameter associated with the torsional vibrations via the controller; determining a target generator torque level via the controller in response to the determination of the at least one oscillation parameter, the target generator torque level being a torque level corresponding to an increased damping level of the torsional vibrations greater than the default damping level; and modifying the torque command using a torque modifier command generated via the controller to establish the torque of the generator at the target generator torque level, thereby producing the increased damping level.

[0116] Clause 2. The method according to Clause 1, wherein the first transient grid event includes a low-voltage ride-through event.

[0117] Clause 3. The method according to any of the preceding clauses, wherein the low voltage ride-through event is characterized by a voltage drop that is at least 50% and less than or equal to 70% of the pre-transient grid event voltage.

[0118] Clause 4. The method according to any of the preceding clauses, wherein the oscillation parameter depends on a plurality of transient event parameters, the plurality of transient event parameters including the power level prior to the first transient grid event, the grid voltage during the first transient grid event, and the duration of the first transient grid event.

[0119] Clause 5. The method according to any of the preceding clauses, wherein determining the oscillation parameter further comprises: receiving data via the controller indicating at least one of the plurality of transient event parameters, wherein the data further includes a missing indication corresponding to at least one additional parameter among the plurality of transient event parameters; and determining an estimated value for the at least one additional parameter via the controller via an estimate of the at least one additional parameter.

[0120] Clause 6. The method according to any of the preceding clauses, wherein the oscillation parameters include at least one of peak shaft torque, torsional vibration frequency, and torsional vibration duration.

[0121] Clause 7. The method according to any of the foregoing clauses, wherein the increased damping level reduces at least one of the peak shaft torque, the torsional vibration frequency, and the torsional vibration duration.

[0122] Clause 8. The method according to any of the preceding clauses, wherein modifying the torque command using the torque modifier command further comprises: detecting, via the controller, the oscillation parameter approaching an activation threshold, wherein the approach of the activation threshold results in the modification of the torque command.

[0123] Clause 9. The method according to any of the foregoing clauses, wherein determining the target generator torque level further comprises: determining the nominal release threshold of the sliding coupler; and establishing the target generator torque level at an amount less than the nominal release threshold of the sliding coupler in order to maintain the traction of the sliding coupler.

[0124] Clause 10. The method according to any of the foregoing clauses further includes, in response to the increased damping level, achieving a sustained shaft torque level within a deviation of the shaft torque level prior to the first transient power grid event, wherein the sustained shaft torque level is achieved prior to the detection of the second transient power grid event.

[0125] Clause 11. The method according to any of the preceding clauses, wherein generating the torque modifier command further comprises: receiving, via the controller, a plurality of operating parameters for at least one of the rotor and the generator; filtering, via the controller, the plurality of operating parameters at a plurality of powertrain torsional frequencies to generate a filtered torsional information dataset; and multiplying the filtered torsional information dataset by at least one control gain via the controller.

[0126] Clause 12. The method according to any of the preceding clauses, wherein the at least one control gain comprises at least one of proportional gain, integral gain, derivative gain, and combinations thereof.

[0127] Clause 13. A system for controlling a wind turbine, the system comprising: a generator rotatably coupled to a rotor via a sliding coupler; and a controller communicatively coupled to the generator, the controller including at least one processor configured to perform a plurality of operations, the plurality of operations including: detecting a first transient grid event; generating a torque command via a powertrain damper control module of the controller in response to the first transient grid event, the torque command being configured to establish a default damping level for torsional vibrations caused by the first transient grid event; determining at least one oscillation parameter associated with the torsional vibrations; determining a target generator torque level in response to the determination of the at least one oscillation parameter, the target generator torque level being a torque level corresponding to an increased damping level of the torsional vibrations greater than the default damping level; and modifying the torque command using a torque modifier command generated via the controller to establish the torque of the generator at the target generator torque level, thereby producing the increased damping level.

[0128] Clause 14. A system according to any of the preceding clauses, wherein the first transient grid event includes a low-voltage ride-through event characterized by a voltage drop that is at least 50% and less than or equal to 70% of the pre-transient grid event voltage.

[0129] Clause 15. A system according to any of the preceding clauses, wherein the oscillation parameter depends on a plurality of transient event parameters, the plurality of transient event parameters including the power level prior to the first grid transient event, the grid voltage during the first transient grid event, and the duration of the first transient grid event, and wherein the oscillation parameter includes at least one of peak shaft torque, torsional vibration frequency, and torsional vibration duration.

[0130] Clause 16. A system according to any of the preceding clauses, wherein the increased damping level reduces at least one of the peak shaft torque, torsional vibration frequency, and torsional vibration duration.

[0131] Clause 17. The system according to any of the preceding clauses, wherein modifying the torque command using the torque modifier command further comprises: detecting the oscillation parameter approaching an activation threshold, wherein the approach of the activation threshold results in the modification of the torque command.

[0132] Clause 18. The system according to any of the preceding clauses, wherein determining the target generator torque level further comprises: determining the nominal release threshold of the sliding coupler; and establishing the target generator torque level at an amount less than the nominal release threshold of the sliding coupler in order to maintain the traction of the sliding coupler.

[0133] Clause 19. The system according to any of the preceding clauses, wherein the plurality of operations further includes, in response to the increased damping level, achieving a sustained shaft torque level within a deviation of the shaft torque level prior to the first power grid transient event, wherein the sustained shaft torque level is achieved prior to the detection of the second transient power grid event.

[0134] Clause 20. The system according to any of the preceding clauses, wherein generating the torque modifier command further comprises: receiving a plurality of operating parameters of the rotor or the generator; filtering the plurality of operating parameters at a plurality of powertrain torsional frequencies to generate a filtered torsional information dataset; and multiplying the filtered torsional information dataset by at least one control gain, wherein the at least one control gain comprises at least one of a proportional gain, an integral gain, a derivative gain, and combinations thereof.

Claims

1. A method for controlling a wind turbine coupled to a power grid, the wind turbine having a power transmission system including a rotor rotatably coupled to a generator via a sliding coupler, the method comprising: The first transient power grid event is detected via the controller; In response to the first transient power grid event, a torque command is generated via the powertrain damper control module of the controller, the torque command being configured to establish a default damping level for torsional vibrations caused by the first transient power grid event; At least one oscillation parameter related to the torsional vibration is determined via the controller; In response to the determination of the at least one oscillation parameter, a target generator torque level is determined via the controller, the target generator torque level being a torque level corresponding to an increased damping level of the torsional vibration that is greater than the default damping level; as well as The torque command is modified using a torque modifier command generated via the controller to establish the generator torque at the target generator torque level, thereby producing the increased damping level; Determining the target generator torque level further includes: Determine the nominal release threshold of the sliding coupler; and The target generator torque level is set at a value less than the nominal release threshold of the sliding coupler in order to maintain the traction of the sliding coupler.

2. The method according to claim 1, wherein, The first transient grid event includes a low-voltage ride-through event.

3. The method of claim 2, wherein, The low-voltage ride-through event is characterized by a voltage drop that is at least 50% and less than or equal to 70% of the pre-transient grid event voltage.

4. The method of claim 1, wherein, The oscillation parameters depend on a plurality of transient event parameters, including the power level prior to the first transient grid event, the grid voltage during the first transient grid event, and the duration of the first transient grid event.

5. The method of claim 4, wherein, Determining the oscillation parameters further includes: The controller receives data indicating at least one of the plurality of transient event parameters, wherein the data further includes indications of the absence of at least one additional parameter corresponding to the plurality of transient event parameters; and An estimated value for the at least one additional parameter is determined via the controller through the estimation of the at least one additional parameter.

6. The method of claim 4, wherein, The oscillation parameters include at least one of the peak shaft torque, torsional vibration frequency, and torsional vibration duration.

7. The method according to claim 6, wherein, The increased damping level reduces at least one of the peak shaft torque, the torsional vibration frequency, and the torsional vibration duration.

8. The method of claim 1, wherein, Modifying the torque command using the torque modifier command further includes: The controller detects that the oscillation parameter approaches an activation threshold, wherein the approach of the activation threshold leads to the modification of the torque command.

9. The method of claim 1, further comprising, in response to the increased damping level, achieving a sustained shaft torque level within a deviation of a shaft torque level prior to the first transient grid event, wherein, The sustained shaft torque level is achieved before the detection of the second transient power grid event.

10. The method of claim 1, wherein, The command to generate the torque modifier also includes: The controller receives multiple operating parameters for at least one of the rotor and the generator. The controller filters multiple operating parameters at multiple powertrain torsional frequencies to generate a filtered torsional information dataset; and The filtered torsional information dataset is multiplied by at least one control gain via the controller.

11. The method of claim 10, wherein, The at least one control gain includes at least one of proportional gain, integral gain, derivative gain, and combinations thereof.

12. A system for controlling a wind turbine, the system comprising: A generator, which is rotatably connected to a rotor via a sliding coupler; as well as A controller communicatively coupled to the generator, the controller including at least one processor configured to perform a plurality of operations, the plurality of operations including: Detecting the first transient power grid event, In response to the first transient power grid event, a torque command is generated via the powertrain damper control module of the controller. This torque command is configured to establish a default damping level for torsional vibrations caused by the first transient power grid event. Determine at least one oscillation parameter related to the torsional vibration. In response to the determination of the at least one oscillation parameter, a target generator torque level is determined, the target generator torque level being a torque level corresponding to an increased damping level of the torsional vibration greater than the default damping level, and The torque command is modified using a torque modifier command generated via the controller to establish the generator torque at the target generator torque level, thereby producing the increased damping level; Determining the target generator torque level further includes: Determine the nominal release threshold of the sliding coupler; and The target generator torque level is set at a value less than the nominal release threshold of the sliding coupler in order to maintain the traction of the sliding coupler.

13. The system of claim 12, wherein, The first transient grid event includes a low-voltage ride-through event characterized by a voltage drop that is at least 50% and less than or equal to 70% of the pre-transient grid event voltage.

14. The system of claim 12, wherein, The oscillation parameters depend on a plurality of transient event parameters, including the power level prior to the first transient grid event, the grid voltage during the first transient grid event, and the duration of the first transient grid event, and wherein the oscillation parameters include at least one of peak shaft torque, torsional vibration frequency, and torsional vibration duration.

15. The system of claim 14, wherein, The increased damping level reduces at least one of the peak shaft torque, torsional vibration frequency, and torsional vibration duration.

16. The system of claim 12, wherein, Modifying the torque command using the torque modifier command further includes: The oscillation parameter is detected to be close to an activation threshold, wherein the proximity of the activation threshold results in the modification of the torque command.

17. The system of claim 12, wherein, Determining the target generator torque level also includes: Determine the nominal release threshold of the sliding coupler; and The target generator torque level is set at a value less than the nominal release threshold of the sliding coupler in order to maintain the traction of the sliding coupler.

18. The system of claim 12, wherein, The plurality of operations also include, in response to the increased damping level, achieving a sustained shaft torque level within a deviation of the shaft torque level prior to the first transient power grid event, wherein the sustained shaft torque level is achieved prior to the detection of the second transient power grid event.

19. The system of claim 12, wherein, The command to generate the torque modifier also includes: Receive multiple operating parameters of the rotor or the generator; Filtering the multiple operating parameters at the torsional frequencies of multiple powertrain systems to generate a filtered torsional information dataset; and The filtered torsional information dataset is multiplied by at least one control gain, wherein the at least one control gain includes at least one of proportional gain, integral gain, derivative gain, and combinations thereof.

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