High voltage ride through control apparatus, system and method for a wind turbine generator system

Abstract

A high-voltage ride-through control device, system, and method for a wind turbine generator set are provided. The high-voltage ride-through control device includes: a controller, which controls the connection state between the power grid, a voltage regulator module, and the pitch system of the wind turbine generator set based on the magnitude of the grid voltage, thereby controlling the supply voltage of the pitch system; and the voltage regulator module, which stabilizes the grid voltage and provides the stabilized grid voltage as the supply voltage to the pitch system when the connection state between the grid and the pitch system is open, wherein the grid voltage is supplied as the supply voltage to the pitch system when the connection state between the grid and the pitch system is open.

Description

Technical Field

[0001] This disclosure relates to the field of wind power generation, and more specifically, to a high voltage ride-through control device, a high voltage ride-through control system, and a high voltage ride-through control method for a wind turbine generator set. Background Technology

[0002] High-voltage ride-through (HVRT) for wind turbines refers to the ability of wind turbines to maintain grid-connected operation even when the grid voltage suddenly spikes. HVRT is crucial for the normal operation of wind farms.

[0003] Furthermore, with the continuous development of wind power technology, many countries and regions have introduced it. However, considering the different grid connection standards in different countries and regions, current wind turbine generators (e.g., pitch control systems) cannot effectively cope with voltage fluctuations in various power grids, thus failing to effectively achieve high voltage ride-through. Summary of the Invention

[0004] This disclosure provides a high-voltage ride-through control device, a high-voltage ride-through control system, and a high-voltage ride-through control method for a wind turbine generator set.

[0005] According to one aspect of this disclosure, a high-voltage ride-through control device for a wind turbine generator set includes: a controller, which controls the connection state between the power grid and a voltage regulator module and the pitch system of the wind turbine generator set based on the magnitude of the grid voltage, so as to control the supply voltage of the pitch system; and the voltage regulator module, which is used to regulate the grid voltage when the connection state between the grid and the power grid is open and to supply the regulated grid voltage as the supply voltage to the pitch system, wherein when the connection state between the grid and the pitch system is open, the grid voltage is supplied as the supply voltage to the pitch system.

[0006] Optionally, in response to the detected grid voltage not being greater than a first voltage threshold, the controller enables the connection between the grid and the pitch system to be open and enables the connection between the grid and the voltage regulator module to be open.

[0007] Optionally, in response to the detected grid voltage being greater than a first voltage threshold and not greater than a second voltage threshold, the controller makes the connection between the grid and the pitch system open and the connection between the grid and the voltage regulator module closed.

[0008] Optionally, in response to the detected grid voltage being greater than a second voltage threshold, the controller makes the connection between the grid and the pitch system open, makes the connection between the grid and the voltage regulator module open, and sends a shutdown command to the pitch system to shut down, wherein the second voltage threshold is greater than the first voltage threshold.

[0009] Optionally, when the connection between the voltage regulator module and the power grid becomes open, the voltage regulator module stabilizes the voltage by stepping down the power grid voltage. In response to the regulated power grid voltage being greater than a first voltage threshold, the controller makes the connection between the power grid and the pitch system open, and the connection between the power grid and the voltage regulator module also open, and sends a shutdown command to the pitch system to shut down the system. In response to the regulated power grid voltage not being greater than the first voltage threshold, the controller maintains the connection between the power grid and the pitch system and the voltage regulator module.

[0010] Optionally, after the controller sends a shutdown command to the pitch system, in response to the detected grid voltage not exceeding a first voltage threshold, the controller establishes a closed connection between the grid and the pitch system and an open connection between the grid and the voltage regulator module, and sends a start-up command to the pitch system to start up; and / or after the controller sends a shutdown command to the pitch system, in response to the detected grid voltage exceeding a first voltage threshold but not exceeding a second voltage threshold, the controller establishes an open connection between the grid and the pitch system and a closed connection between the grid and the voltage regulator module to regulate the grid voltage. If the regulated grid voltage does not exceed the first voltage threshold, the controller sends a start-up command to the pitch system to start up.

[0011] Optionally, the first voltage threshold is the maximum supply voltage supported by the high voltage ride-through control of the pitch system itself, and the second voltage threshold is the maximum input voltage supported when the voltage regulator module performs voltage regulation to provide a normal supply voltage to the pitch system. When or after the controller sends a shutdown command or a start command to the pitch system, the controller sends shutdown information indicating that the pitch system will shut down or start information indicating that the pitch system will start to the main controller of the wind turbine generator.

[0012] Optionally, the high-voltage ride-through control device further includes: a communication module, which, based on the controller's control, communicates with the pitch system to send start-up or stop commands and / or communicates with the main controller to send start-up or stop information; a voltage detector, used to detect the magnitude of the grid voltage and / or the stabilized grid voltage; and a switch, connected between the grid and the voltage stabilization module and the pitch system, and controlling the connection status between the grid and the voltage stabilization module and the pitch system under the control of the controller.

[0013] Optionally, in response to the regulated grid voltage being greater than a first voltage threshold, the controller makes the connection between the grid and the pitch system open, makes the connection between the grid and the voltage regulator module open, and sends a shutdown command to the pitch system for shutdown. This process includes: in response to the regulated grid voltage being greater than the first voltage threshold when voltage regulation is performed for a first duration, the controller makes the connection between the grid and the pitch system open, makes the connection between the grid and the voltage regulator module open, and sends a shutdown command to the pitch system for shutdown.

[0014] Optionally, the process of the controller maintaining the connection between the grid and the pitch system and the voltage regulator module in response to the regulated grid voltage not being greater than the first voltage threshold includes: in response to the regulated grid voltage not being greater than the first voltage threshold after voltage regulation has been performed for a first duration, the controller maintaining the connection between the grid and the pitch system and the voltage regulator module.

[0015] Optionally, if the regulated grid voltage is not greater than the first voltage threshold, the controller sends a start-up command to the pitch system for start-up. This process includes: if the regulated grid voltage is not greater than the first voltage threshold for a second duration, the controller sends a start-up command to the pitch system for start-up.

[0016] Optionally, the controller determines the first duration based on the grid voltage, wherein the higher the grid voltage, the shorter the first duration.

[0017] According to another aspect of this disclosure, a high-voltage ride-through control system for a wind turbine generator includes: the high-voltage ride-through control device; and the pitch system. Optionally, in response to the pitch system's supply voltage being no greater than a first voltage threshold and greater than a third voltage threshold, the pitch system itself performs high voltage ride-through control.

[0018] According to another aspect of this disclosure, a wind power generation control system includes: a main controller configured to control a wind turbine generator set; the high voltage ride-through control device; and a pitch system configured to perform pitch control operations on the wind turbine generator set based on the supply voltage, wherein the main controller and the high voltage ride-through control device are disposed in the nacelle, and the pitch system is disposed in the hub.

[0019] According to another aspect of this disclosure, a high-voltage ride-through control method for a wind turbine generator set includes: detecting the voltage of the power grid; and controlling the connection state between the power grid and the pitch system and a voltage regulator module outside the pitch system based on the magnitude of the power grid voltage, so as to control the power supply voltage of the pitch system. Specifically, when the connection state between the power grid and the voltage regulator module is a closed loop, the voltage grid voltage is regulated by the voltage regulator module and the regulated power grid voltage is provided to the pitch system as the power supply voltage. When the connection state between the power grid and the pitch system is a closed loop, the power grid voltage is provided to the pitch system as the power supply voltage.

[0020] Optionally, in response to the detected grid voltage not being greater than a first voltage threshold, the connection between the grid and the pitch system is made to be closed, and the connection between the grid and the voltage regulator module is made to be open.

[0021] Optionally, in response to the detected grid voltage being greater than a first voltage threshold and not greater than a second voltage threshold, the connection between the grid and the pitch system is made open, and the connection between the grid and the voltage regulator module is made closed.

[0022] Optionally, in response to the detected grid voltage being greater than a second voltage threshold, the connection between the grid and the pitch system is made open, the connection between the grid and the voltage regulator module is made open, and a shutdown command is sent to the pitch system to perform a shutdown.

[0023] Optionally, the second voltage threshold is greater than the first voltage threshold.

[0024] Optionally, when the connection between the voltage regulator module and the power grid becomes open, the voltage regulator module steps down the power grid voltage to achieve voltage regulation.

[0025] Optionally, in response to the regulated grid voltage being greater than a first voltage threshold, the connection between the grid and the pitch system is made open, the connection between the grid and the voltage regulator module is made open, and a shutdown command is sent to the pitch system to perform a shutdown.

[0026] Optionally, in response to the regulated grid voltage not exceeding a first voltage threshold, the connection between the grid and the pitch system and the voltage regulator module is maintained.

[0027] Optionally, after sending a shutdown command to the pitch system, in response to the detected grid voltage not being greater than a first voltage threshold, the connection between the grid and the pitch system is made to be open, and the connection between the grid and the voltage regulator module is made to be open, and a startup command is sent to the pitch system to start up.

[0028] Optionally, after sending a shutdown command to the pitch system, in response to the detected grid voltage being greater than a first voltage threshold and not greater than a second voltage threshold, the connection between the grid and the pitch system is made open, and the connection between the grid and the voltage regulator module is made closed to regulate the grid voltage. If the regulated grid voltage is not greater than the first voltage threshold, a startup command is sent to the pitch system to start the system.

[0029] Optionally, the first voltage threshold is the maximum supply voltage supported by the high voltage ride-through control of the pitch system itself, and the second voltage threshold is the maximum input voltage supported when the voltage regulator module performs voltage regulation to provide a normal supply voltage to the pitch system.

[0030] Optionally, when or after sending a shutdown command or a startup command to the pitch system, a shutdown message indicating that the pitch system will shut down or a startup message indicating that the pitch system will start up is sent to the main controller of the wind turbine generator.

[0031] Optionally, the system can communicate with the pitch system via an external communication module to send power-on or power-off commands and / or communicate with the main controller to send power-on or power-off information.

[0032] Optionally, the magnitude of the grid voltage and / or the regulated grid voltage can be detected by a voltage detector outside the pitch system.

[0033] Optionally, the connection status between the power grid and the voltage regulator module and the pitch system can be controlled by controlling the switch connected between the power grid and the voltage regulator module and the pitch system.

[0034] Optionally, in response to the regulated grid voltage being greater than a first voltage threshold, the controller makes the connection between the grid and the pitch system open, makes the connection between the grid and the voltage regulator module open, and sends a shutdown command to the pitch system to perform a shutdown, the steps include: in response to the regulated grid voltage being greater than the first voltage threshold when voltage regulation is performed for a first duration, the controller makes the connection between the grid and the pitch system open, makes the connection between the grid and the voltage regulator module open, and sends a shutdown command to the pitch system to perform a shutdown.

[0035] Optionally, the step of the controller maintaining the connection between the grid and the pitch system and the voltage regulator module in response to the regulated grid voltage not being greater than a first voltage threshold includes: in response to the regulated grid voltage not being greater than the first voltage threshold after voltage regulation has been performed for a first duration, the controller maintaining the connection between the grid and the pitch system and the voltage regulator module.

[0036] Optionally, if the regulated grid voltage is not greater than the first voltage threshold, the step of the controller sending a start-up command to the pitch system to start up includes: if the regulated grid voltage is not greater than the first voltage threshold for a second duration, the controller sends a start-up command to the pitch system to start up.

[0037] Optionally, the high voltage ride-through control method further includes: determining a first duration based on the grid voltage, wherein the higher the grid voltage, the shorter the first duration.

[0038] The high-voltage ride-through control equipment, control system, and method for wind turbine generators can stably and reliably achieve high-voltage ride-through control, improve the adaptability of high-voltage ride-through under different power grids, and avoid damage or failure of the pitch system during high-voltage ride-through. Attached Figure Description

[0039] The above and other objects and features of this disclosure will become clearer from the following description of embodiments of this disclosure in conjunction with the accompanying drawings.

[0040] Figure 1 This is a block diagram of a high voltage ride-through control device for a wind turbine generator set according to a disclosed example embodiment.

[0041] Figure 2 This is a block diagram of a high-voltage ride-through control system for a wind turbine generator set according to a disclosed example embodiment.

[0042] Figure 3 This is a block diagram of a wind power generation control system based on a publicly disclosed example embodiment.

[0043] Figure 4 This is a flowchart of a high-voltage ride-through control method for a wind turbine generator set according to a publicly disclosed example embodiment.

[0044] Figure 5 Based on the disclosed example embodiments Figure 4 A flowchart of an example embodiment of step S420.

[0045] Figure 6 This is a flowchart of a method for performing startup of a pitch system in high-voltage ride-through control according to a disclosed example embodiment. Detailed Implementation

[0046] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to those orders set forth herein, but may be changed as will become clear upon understanding this disclosure, except for operations that must occur in a specific order. Furthermore, for clarity and conciseness, descriptions of features known in the art may be omitted.

[0047] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein, which will become clear upon understanding the disclosure of this application.

[0048] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more.

[0049] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts should not be limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Thus, without departing from the teaching of the examples described herein, the first component, first assembly, first region, first layer, or first part referred to as the first component, first assembly, first region, first layer, or first part may also be referred to as the second component, second assembly, second region, second layer, or second part.

[0050] In the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to," or "bonded to" another element, the element may be directly "on" another element, directly "connected to," or "bonded to" the other element, or one or more other elements may be present in between. Conversely, when an element is described as being "directly on" another element, "directly connected to," or "directly bonded to" another element, no other elements may be present in between.

[0051] The terminology used herein is for the purpose of describing various examples only and is not intended to limit disclosure. Unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the described features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0052] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains upon understanding this disclosure. Unless expressly defined herein, terms (such as those defined in a general dictionary) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and in this disclosure, and shall not be interpreted in an idealized or overly formalistic manner.

[0053] Furthermore, in the description of the examples, detailed descriptions of well-known related structures or functions will be omitted when it is believed that such detailed descriptions would lead to a vague interpretation of this disclosure.

[0054] Figure 1 This is a block diagram of a high voltage ride-through control device for a wind turbine generator set according to a disclosed example embodiment.

[0055] Reference Figure 1 The high voltage ride-through control device 100 for a wind turbine generator set according to the disclosed example embodiment may include a controller 110, a voltage regulator module 120, a switch 130, a voltage detector 140, and a communication module 150.

[0056] According to this disclosure, the high-voltage ride-through control device 100 can exist independently of the pitch system 20 of the wind turbine generator set. That is, the high-voltage ride-through control function of the high-voltage ride-through control device 100 according to this disclosure can be independent of the high-voltage ride-through control function of the pitch system 20 itself. Therefore, during high-voltage ride-through, at least one of the high-voltage ride-through control device 100 and the pitch system 20 may participate in the high-voltage ride-through control. This disclosure, based on the existing high-voltage ride-through control mechanism of the pitch system 20, additionally sets up a separate high-voltage ride-through control device 100 to participate in the high-voltage ride-through control, and coordinates the respective high-voltage ride-through control functions of the pitch system 20 and the high-voltage ride-through control device 100, thereby achieving more reliable high-voltage ride-through control.

[0057] According to an embodiment of the present disclosure, the controller 110 can control the connection state between the power grid 10 and the voltage regulator module 120 and the pitch system 20 of the wind turbine generator set based on the magnitude of the power grid voltage U0 of the power grid 10, so as to control the power supply voltage U1 of the pitch system 20. In response to the detected grid voltage U0 not being greater than a first voltage threshold, the controller 110 makes the connection between the grid 10 and the pitch system 20 a closed circuit, and makes the connection between the grid 10 and the voltage regulator module 120 an open circuit.

[0058] The first voltage threshold can be the maximum supply voltage supported by the high voltage ride-through control of the pitch system 20 itself. In the prior art, the pitch system 20 itself also has high voltage ride-through control capability. When the grid voltage U0, which serves as the supply voltage U1, is greater than the first voltage threshold (i.e., the supply voltage U1 exceeds the maximum voltage that the pitch system 20 itself can withstand), the pitch system 20 cannot achieve high voltage ride-through, resulting in damage or failure of the pitch system 20.

[0059] According to this disclosure, the controller 110 directly uses the grid 10 as a power source to supply power to the pitch system 20 only when the grid voltage U0 does not exceed the maximum supply voltage that the pitch system 20 can withstand. At this time, the grid voltage U0 is supplied to the pitch system 20 as the supply voltage U1.

[0060] When the detected grid voltage U0 is greater than the first voltage threshold, the controller 110 can stop directly using the grid 10 as a power source to supply power to the pitch system 20. Instead, it connects the grid 10 to the voltage regulator module 120 to regulate the grid voltage U0 and obtain the regulated grid voltage (hereinafter referred to as the regulated voltage) U3. The regulated voltage U3 is then provided to the pitch system 20 as the power supply voltage U1.

[0061] In one example embodiment, considering the voltage regulation capability of the voltage regulator module 120 itself, when the grid voltage U0 exceeds the ability of the voltage regulator module 120 to provide a normal supply voltage U1 (e.g., a supply voltage U1 not greater than the first voltage threshold) to the pitch system 20 (corresponding to the second voltage threshold), the regulated voltage U3 output by the voltage regulator module 120 is greater than the first voltage threshold and also exceeds the maximum voltage that the pitch system 20 itself can withstand. If the regulated voltage U3 is still supplied to the pitch system 20 at this time, it will cause damage or failure to the pitch system 20.

[0062] Therefore, the controller 110 connects the grid 10 to the voltage regulator module 120 only when the grid voltage U0 is greater than the first voltage threshold but not exceeding the second voltage threshold. Correspondingly, when the grid voltage U0 is greater than the second voltage threshold, the controller 110 sets the connection between the grid 10, the voltage regulator module 120, and the pitch system 20 to an open circuit or disconnect, and notifies the pitch system 20 to shut down.

[0063] In other words, in response to the detected grid voltage U0 being greater than a first voltage threshold and not greater than a second voltage threshold, the controller 110 makes the connection between the grid 10 and the pitch system 20 open and the connection between the grid 10 and the voltage regulator module 120 closed; in response to the detected grid voltage U0 being greater than the second voltage threshold, the controller 110 makes the connection between the grid 10 and the pitch system 20 open and the connection between the grid 10 and the voltage regulator module 120 open, and sends a shutdown command to the pitch system 20 to shut down.

[0064] Here, as described above, the second voltage threshold can represent the maximum input voltage supported by the voltage regulator module 120 performing voltage regulation to provide the normal supply voltage U1 to the pitch system 20. The second voltage threshold is greater than the first voltage threshold.

[0065] In another example embodiment, to further ensure the power supply safety and reliability of the pitch system 20, the regulated voltage U3 output by the voltage regulator module 120 is monitored. If the regulated voltage U3 is greater than a first voltage threshold, it indicates that the voltage regulator module 120 has not effectively regulated the grid voltage U0 and cannot provide the pitch system 20 with a normal power supply voltage U1. In this case, the controller 110 makes the connection between the grid 10 and the voltage regulator module 120 and the pitch system 20 open or disconnected, and notifies the pitch system 20 to shut down. That is, in response to the regulated voltage U3 being greater than the first voltage threshold, the controller 110 makes the connection between the grid 10 and the pitch system 20 open, makes the connection between the grid 10 and the voltage regulator module 120 open, and sends a shutdown command to the pitch system 20 to shut down.

[0066] In another example embodiment, to avoid continuously applying high voltage to the pitch system and to prevent damage or malfunction, in response to the regulated grid voltage U0 being greater than a first voltage threshold after voltage stabilization for a first duration, the controller 110 makes the connection between the grid 10 and the pitch system 20 open, makes the connection between the grid 10 and the voltage regulator module 120 open, and sends a shutdown command to the pitch system 20 to perform a shutdown; in response to the regulated grid voltage U0 being less than the first voltage threshold after voltage stabilization for a first duration, the controller 110 maintains the connection between the grid 10 and the pitch system 20 and the voltage regulator module 120, that is, the controller 110 keeps the connection between the grid 10 and the pitch system 20 open and keeps the connection between the grid 10 and the voltage regulator module 120 closed. In a preferred embodiment, the controller 110 may determine the first duration based on the detected grid voltage U0. Specifically, the larger the detected grid voltage U0, the shorter the first duration is determined to be.

[0067] After the pitch system 20 is shut down, the controller 110 can determine whether to notify the pitch system 20 to start up based on the detected grid voltage U0. That is, when the detected grid voltage U0 is sufficient to supply power to the pitch system 20 via the high-voltage ride-through control device 100 according to this disclosure, the controller 110 can notify the pitch system 20 to start up. For example, when the grid voltage U0 is not greater than a first voltage threshold or is greater than the first voltage threshold but not exceeding a second voltage threshold, the controller 110 can send a start-up command to the pitch system 20 to initiate the start-up process.

[0068] According to an example embodiment of this disclosure, after the controller 110 sends a shutdown command to the pitch system 20, in response to the detected grid voltage U0 not being greater than a first voltage threshold, the controller 110 makes the connection between the grid 10 and the pitch system 20 a closed circuit, and makes the connection between the grid 10 and the voltage regulator module 120 an open circuit, and sends a power-on command to the pitch system 20 to start up.

[0069] After the controller 110 sends a shutdown command to the pitch system 20, in response to the detected grid voltage U0 being greater than a first voltage threshold and not greater than a second voltage threshold, the controller 110 makes the connection between the grid 10 and the pitch system 20 open and makes the connection between the grid 10 and the voltage regulator module 120 closed to regulate the grid voltage U0. If the regulated voltage U3 is not greater than the first voltage threshold, the controller 110 sends a power-on command to the pitch system 20 to start the system.

[0070] In one example embodiment, in order to enhance the stability and reliability of the power supply voltage of the pitch system, if the regulated grid voltage is not greater than the first voltage threshold for a second duration, the controller will send a power-on command to the pitch system to start it up, ensuring the safe startup of the pitch system.

[0071] According to embodiments of the present disclosure, switch 130 is connected between the power grid 10 and the voltage regulator module 120 and the pitch system 20. Switch 130 can connect or disconnect the power grid 10 from the voltage regulator module 120 or the pitch system 20 under the control of controller 110. In one example embodiment, switch 130 may have three states (first state to third state).

[0072] In the first state, switch 130 can connect only the power grid 10 to the pitch system 20. In this case, the connection between the power grid 10 and the pitch system 20 is closed, while the connection between the power grid and the voltage regulator module 120 is open. At this time, the power grid voltage U0 is supplied to the pitch system 20 as the power supply voltage U1.

[0073] In the second state, switch 130 can connect only the power grid 10 and the voltage regulator module 120. In this case, the connection between the power grid 10 and the pitch system 20 is open, and the connection between the power grid and the voltage regulator module 120 is closed.

[0074] In the third state, switch 130 can disconnect the power grid 10 from both the voltage regulator module 120 and the pitch system 20. In this state, the connection between the power grid 10 and the pitch system 20 is open, and the connection between the power grid and the voltage regulator module 120 is also open.

[0075] The voltage regulator module 120 according to an embodiment of this disclosure can regulate the input voltage. When the connection between the voltage regulator module 120 and the power grid 10 is open, the voltage regulator module 120 regulates the grid voltage U0 and provides the regulated grid voltage as the supply voltage U1 to the pitch system 20. When the connection between the voltage regulator module 120 and the power grid 10 becomes closed, the voltage regulator module 120 regulates the grid voltage by stepping it down. The voltage regulator module 120 can be implemented using various voltage regulators or transformers with step-down capabilities.

[0076] According to embodiments of the present disclosure, the voltage detector 140 can detect the mains voltage U0 and the magnitude of the mains voltage regulated by the voltage regulator module 120 (i.e., the voltage at the output terminal of the voltage regulator module 120). In an example embodiment, the voltage detector 140 may include a first sub-voltage detector and a second sub-voltage detector. The first sub-voltage detector is used to detect the magnitude of the mains voltage U0, and the second sub-voltage detector is used to detect the magnitude of the mains voltage regulated by the voltage regulator module 120.

[0077] In one example embodiment, when or after the controller 110 sends a shutdown command or a startup command to the pitch system 20, the controller 110 also sends shutdown information indicating that the pitch system 20 will shut down or startup information indicating that the pitch system 20 will start up to the main controller of the wind turbine generator, so that the main controller can anticipate the shutdown or startup of the pitch system 20 before receiving the notification from the pitch system 20.

[0078] According to embodiments of this disclosure, the communication module 150 can communicate with the pitch system 20 based on the control of the controller 110 to send power-on or power-off commands. Furthermore, the communication module 150 can communicate with the main controller based on the control of the controller 110 to send power-on or power-off information.

[0079] The communication module 150 can be implemented using various communication technologies (e.g., various wired or wireless communication technologies).

[0080] Figure 2This is a block diagram of a high-voltage ride-through control system for a wind turbine generator set according to a disclosed example embodiment.

[0081] Reference Figure 2 The high voltage ride-through control system 200 for a wind turbine generator set according to the disclosed example embodiments may include a high voltage ride-through control device 100 and a pitch system 20.

[0082] Already referred to Figure 1 The high-voltage ride-through control device 100 has been described and will not be repeated here. The pitch system 20 can be any pitch system in a wind turbine generator set that has high-voltage ride-through control functionality. The pitch system 20 and the high-voltage ride-through control device 100 can work together to perform high-voltage ride-through control. When the grid voltage U0 is greater than a first voltage threshold, the high-voltage ride-through control device 100 performs high-voltage ride-through control; when the grid voltage U0 is not greater than the first voltage threshold, the pitch system 20 performs high-voltage ride-through control.

[0083] The pitch system 20 can perform high-voltage ride-through control in response to the received supply voltage U1. For example, in response to the supply voltage U1 being no greater than a first voltage threshold and greater than a third voltage threshold, the pitch system 20 performs high-voltage ride-through control itself. The third voltage threshold can be the voltage that triggers the pitch system 20 to perform high-voltage ride-through control. The third voltage threshold can be less than the first voltage threshold.

[0084] Figure 3 This is a block diagram of a wind power generation control system based on a publicly disclosed example embodiment.

[0085] Reference Figure 3 The wind power generation control system 300 according to the disclosed example embodiment may include a main controller 310, a high voltage ride-through control device 100, and a pitch system 20.

[0086] The main controller 310 can control the overall operation of the wind turbine generator set.

[0087] The pitch control system 20 performs pitch control operations on the wind turbine generator based on the supply voltage U1. Furthermore, as referred to... Figure 1 and Figure 2 The pitch system 20 and the high voltage ride-through control device 100 can work together to perform high voltage ride-through control.

[0088] The main controller 310 and the high voltage ride-through control device 100 are installed in the nacelle of the wind turbine generator set, and the pitch system 20 is installed in the hub of the wind turbine generator set.

[0089] Figure 4 This is a flowchart of a high-voltage ride-through control method for a wind turbine generator set according to a publicly disclosed example embodiment.

[0090] Reference Figure 4 In step S410, the grid voltage U0 is detected. For example, this can be done by referring to... Figure 1 The voltage detector 140 described is used to detect the grid voltage U0 of the power grid. However, this disclosure is not limited to this, and the grid voltage U0 of the power grid can also be detected in other ways.

[0091] In step S420, based on the magnitude of the grid voltage U0 of the grid 10, the connection state between the grid 10 and the voltage regulator module 120 outside the pitch system 20 and the pitch system 20 is controlled to control the supply voltage U1 of the pitch system 20. This can be achieved by using a reference... Figure 1 The controller 110 described is used to execute step S420.

[0092] When the connection between the power grid 10 and the voltage regulator module 120 is closed, and the connection between the power grid 10 and the pitch system 20 is open, the voltage regulator module 120 regulates the grid voltage U0 and provides the regulated voltage U3 as the supply voltage U1 to the pitch system 20. When the connection between the power grid 10 and the pitch system 20 is closed, and the connection between the power grid 10 and the voltage regulator module 120 is open, the grid voltage U0 is supplied to the pitch system 20 as the supply voltage U1. When the connection between the power grid 10 and the pitch system 20 is open, and the connection between the power grid 10 and the voltage regulator module 120 is also open, the pitch system 20 is notified to shut down.

[0093] Figure 5 Based on the disclosed example embodiments Figure 4 A flowchart of an example embodiment of step S420.

[0094] Reference Figure 5 In step S510, it is determined whether the detected grid voltage U0 is greater than the first voltage threshold.

[0095] In response to the detected grid voltage U0 not being greater than the first voltage threshold, in step S520, the connection between the grid 10 and the pitch system 20 is made to be closed, and the connection between the grid 10 and the voltage regulator module 120 is made to be open.

[0096] In response to the detected grid voltage U0 being greater than a first voltage threshold, in step S530, it is determined whether the detected grid voltage U0 is greater than a second voltage threshold.

[0097] In response to the detected grid voltage U0 being greater than a first voltage threshold and not greater than a second voltage threshold, in step S540, the connection between the grid 10 and the pitch system 20 is made open, and the connection between the grid 10 and the voltage regulator module 120 is made closed. When the connection between the voltage regulator module 120 and the grid 10 becomes closed, the voltage regulator module 120 can step down the grid voltage to regulate it.

[0098] In step S550, it is detected whether the regulated voltage U3 is greater than the first voltage threshold.

[0099] In response to the regulated voltage U3 being greater than the first voltage threshold, in step S560, the connection between the power grid 10 and the pitch system 20 is made open, the connection between the power grid 10 and the voltage regulator module 120 is made open, and a shutdown command is sent to the pitch system 20 to perform a shutdown.

[0100] In response to the regulated voltage U3 not being greater than the first voltage threshold, in step S570, the connection state between the power grid 10 and the pitch system 20 and the voltage regulator module 120 is maintained, that is, the connection state between the power grid 10 and the pitch system 20 is maintained as an open circuit, and the connection state between the power grid 10 and the voltage regulator module 120 is maintained as a closed circuit.

[0101] In response to the detected grid voltage U0 being greater than the second voltage threshold, in step S580, the connection between the grid 10 and the pitch system 20 is made open, the connection between the grid 10 and the voltage regulator module 120 is also made open, and a shutdown command is sent to the pitch system 20 to initiate a shutdown. Here, the second voltage threshold is greater than the first voltage threshold.

[0102] In one example embodiment, to avoid continuously applying high voltage to the pitch system and prevent damage or malfunction, step S560 is executed in response to the regulated grid voltage U0 being greater than a first voltage threshold after voltage stabilization for a first duration. Step S570 is executed in response to the regulated grid voltage U0 not being greater than the first voltage threshold after voltage stabilization for the first duration. Here, the first duration can be determined based on the detected grid voltage U0. Specifically, the larger the detected grid voltage U0, the shorter the first duration is determined to be.

[0103] Figure 6 This is a flowchart of a method for performing startup of a pitch system in high-voltage ride-through control according to a disclosed example embodiment.

[0104] Reference Figure 6 After the shutdown command is sent to the pitch system (e.g., in...) Figure 5(After step S560 or S580), in step S610, the grid voltage U0 is detected.

[0105] In step S620, it is determined whether the detected grid voltage U0 is greater than the first voltage threshold.

[0106] In response to the detected grid voltage U0 not being greater than the first voltage threshold, in step S630, the connection between the grid 10 and the pitch system 20 is made to be open, and the connection between the grid 10 and the voltage regulator module 120 is made to be open, and a power-on command is sent to the pitch system to start the system.

[0107] In response to the detected grid voltage U0 being greater than a first voltage threshold and not greater than a second voltage threshold, in step S640, the connection between the grid 10 and the pitch system 20 is made open, and the connection between the grid 10 and the voltage regulator module 120 is made closed to regulate the grid voltage U0.

[0108] In step S650, it is detected whether the regulated voltage U3 is greater than the first voltage threshold.

[0109] In response to the regulated voltage U3 not being greater than the first voltage threshold, in step S660, the connection state remains unchanged, and a power-on command is sent to the pitch system 20 to start the system.

[0110] In response to the regulated voltage U3 being greater than the first voltage threshold, return to step S610.

[0111] In one example embodiment, in order to enhance the stability and reliability of the power supply voltage of the pitch system, step S660 is executed only if the regulated voltage U3 is not greater than the first voltage threshold for a second duration.

[0112] In one example embodiment, when or after a stop command or start command is sent to the pitch system, stop information indicating that the pitch system will stop or start information indicating that the pitch system will start can be sent to the main controller of the wind turbine.

[0113] In one example embodiment, the pitch system 20 can be communicated with via a communication module 150 external to the pitch system 20 to send power-on or power-off commands and / or communicated with the main controller to send power-on or power-off information.

[0114] In one example embodiment, the magnitude of the grid voltage U0 and / or the regulated voltage U3 can be detected by a voltage detector 140 external to the pitch system.

[0115] In one example embodiment, the connection status between the power grid 10 and the voltage regulator module 120 and the pitch system 20 can be controlled by controlling the switch 130 connected between the power grid 10 and the voltage regulator module 120 and the pitch system 20.

[0116] It should be understood, referring to Figures 4 to 6 The order of steps in the described method is merely an example and is not limited to the order of steps set forth herein. Rather, except for steps that must occur in a specific order, the order of steps may be changed as will become clear upon understanding the disclosure of this application. For example, some steps may be performed simultaneously or in reverse order.

[0117] The high-voltage ride-through control device, high-voltage ride-through control system, and wind power generation control system according to this disclosure can execute the corresponding steps in the above method, for example, through executable machine-readable instructions. The specific implementation method can be found in the method embodiments described above, and will not be repeated here.

[0118] The high-voltage ride-through control equipment, control system, and method for wind turbine generators can stably and reliably achieve high-voltage ride-through control, improve the adaptability of high-voltage ride-through under different power grids, and avoid damage or failure of the pitch system during high-voltage ride-through.

[0119] The features, structures, or characteristics described in this disclosure can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the foregoing description to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of this disclosure.

[0120] The specific embodiments of this disclosure have been described in detail above. Although some embodiments have been shown and described, those skilled in the art should understand that modifications and variations can be made to these embodiments without departing from the principles and spirit of this disclosure, which are defined by the claims and their equivalents. Such modifications and variations should also be within the protection scope of the claims of this disclosure.

Claims

1. A high-voltage ride-through control device for a wind turbine generator set, characterized in that, The high-voltage ride-through control device includes: The controller, based on the grid voltage, controls the connection status between the grid and the voltage regulator module and the pitch system of the wind turbine generator, thereby controlling the power supply voltage of the pitch system; and The voltage regulator module is used to regulate the grid voltage when the connection with the grid is open, and then supply the regulated grid voltage as the power supply voltage to the pitch system. When the connection between the power grid and the pitch system is open, the grid voltage is supplied to the pitch system as the power supply voltage.

2. The high voltage ride-through control device according to claim 1, characterized in that, In response to the detected grid voltage not exceeding a first voltage threshold, the controller establishes a closed circuit between the grid and the pitch system, and an open circuit between the grid and the voltage regulator module. In response to a detected grid voltage greater than a first voltage threshold but not greater than a second voltage threshold, the controller sets the connection between the grid and the pitch system to an open circuit and the connection between the grid and the voltage regulator module to a closed circuit. In response to the detected grid voltage exceeding a second voltage threshold, the controller opens the connection between the grid and the pitch system, opens the connection between the grid and the voltage regulator module, and sends a shutdown command to the pitch system to initiate a shutdown. The second voltage threshold is greater than the first voltage threshold.

3. The high voltage ride-through control device according to claim 2, characterized in that, When the voltage regulator module changes from a closed-circuit connection to a live grid, it stabilizes the grid voltage by stepping it down. In response to the regulated grid voltage exceeding a first voltage threshold, the controller opens the connection between the grid and the pitch system, opens the connection between the grid and the voltage regulator module, and sends a shutdown command to the pitch system to initiate a shutdown. In response to the regulated grid voltage not exceeding the first voltage threshold, the controller maintains the connection between the grid, the pitch system, and the voltage regulator module.

4. The high voltage ride-through control device according to claim 2 or 3, characterized in that, After the controller sends a shutdown command to the pitch system, in response to the detected grid voltage not exceeding a first voltage threshold, the controller establishes a closed circuit between the grid and the pitch system, and an open circuit between the grid and the voltage regulator module, and sends a startup command to the pitch system to initiate startup; and / or After the controller sends a shutdown command to the pitch system, in response to the detected grid voltage being greater than a first voltage threshold and not greater than a second voltage threshold, the controller makes the connection between the grid and the pitch system open and the connection between the grid and the voltage regulator module closed to regulate the grid voltage. If the regulated grid voltage is not greater than the first voltage threshold, the controller sends a power-on command to the pitch system to start the system.

5. The high voltage ride-through control device according to claim 4, characterized in that, The first voltage threshold is the maximum supply voltage supported by the high-voltage ride-through control of the pitch system itself. The second voltage threshold is the maximum input voltage supported by the voltage regulator module when it performs voltage regulation to provide a normal supply voltage to the pitch system. When or after the controller sends a shutdown command or a start command to the pitch system, the controller will send a shutdown message indicating that the pitch system will be shut down or a start message indicating that the pitch system will be started to the main controller of the wind turbine.

6. The high voltage ride-through control device according to claim 5, characterized in that, The high-voltage ride-through control device also includes: The communication module, based on the controller's control, communicates with the pitch system to send start-up or stop commands and / or communicates with the main controller to send start-up or stop information; A voltage detector is used to detect the magnitude of the mains voltage and / or the regulated mains voltage; and The switch connects the power grid to the voltage regulator module and the pitch system, and controls the connection status between the power grid and the voltage regulator module and the pitch system under the control of the controller.

7. The high voltage ride-through control device according to claim 4, characterized in that, In response to the regulated grid voltage exceeding a first voltage threshold, the controller opens the connection between the grid and the pitch system, opens the connection between the grid and the voltage regulator module, and sends a shutdown command to the pitch system to initiate a shutdown. This process includes: in response to the regulated grid voltage exceeding the first voltage threshold after a first duration of voltage regulation, the controller opens the connection between the grid and the pitch system, opens the connection between the grid and the voltage regulator module, and sends a shutdown command to the pitch system to initiate a shutdown. The process of maintaining the connection between the controller and the pitch system and the voltage regulator module in response to the regulated grid voltage not exceeding a first voltage threshold includes: maintaining the connection between the controller and the pitch system and the voltage regulator module in response to the regulated grid voltage not exceeding the first voltage threshold after voltage regulation has been performed for a first duration. If the regulated grid voltage is not greater than the first voltage threshold, the controller sends a start-up command to the pitch system to start up. The process includes: if the regulated grid voltage is not greater than the first voltage threshold for a second duration, the controller sends a start-up command to the pitch system to start up.

8. The high voltage ride-through control device according to claim 7, characterized in that, The controller determines the first duration based on the grid voltage, where the higher the grid voltage, the shorter the first duration.

9. A high-voltage ride-through control system for a wind turbine generator set, characterized in that, The high-voltage ride-through control system includes: The high voltage ride-through control device according to any one of claims 1 to 8; and The pitch system.

10. The high-voltage ride-through control system according to claim 9, characterized in that, In response to the pitch system supply voltage being no greater than a first voltage threshold and greater than a third voltage threshold, the pitch system itself performs high voltage ride-through control.

11. A wind power generation control system, characterized in that, The wind power generation control system includes: The main controller is configured to control the wind turbine generator set; The high voltage ride-through control device according to any one of claims 1 to 8; and The pitch control system is configured to perform pitch control operations on the wind turbine generator based on the supply voltage. The main controller and the high-voltage ride-through control device are located in the nacelle, and the pitch system is located in the hub.

12. A high-voltage ride-through control method for a wind turbine generator set, characterized in that, The high-voltage ride-through control method includes: Detecting the voltage of the power grid; and The connection status between the power grid and the pitch system, as well as the external voltage regulator module, is controlled based on the magnitude of the grid voltage, thereby controlling the power supply voltage of the pitch system. When the connection between the power grid and the voltage regulator module is open, the voltage regulator module regulates the grid voltage and provides the regulated grid voltage as the power supply voltage to the pitch system. When the connection between the power grid and the pitch system is open, the grid voltage is supplied to the pitch system as the power supply voltage.

13. The high-voltage ride-through control method according to claim 12, characterized in that, In response to the detected grid voltage not exceeding a first voltage threshold, the connection between the grid and the pitch system is made closed, and the connection between the grid and the voltage regulator module is made open. In response to a detected grid voltage greater than a first voltage threshold and not greater than a second voltage threshold, the connection between the grid and the pitch system is set to open circuit, and the connection between the grid and the voltage regulator module is set to closed circuit. In response to the detected grid voltage exceeding a second voltage threshold, the connection between the grid and the pitch system is made open, the connection between the grid and the voltage regulator module is also made open, and a shutdown command is sent to the pitch system to initiate a shutdown. The second voltage threshold is greater than the first voltage threshold.

14. The high-voltage ride-through control method according to claim 13, characterized in that, When the voltage regulator module's connection to the power grid changes to a closed loop, it steps down the grid voltage to regulate it. If the regulated grid voltage exceeds a first voltage threshold, the connection between the grid and the pitch system is set to open, and the connection between the grid and the voltage regulator module is also set to open. A shutdown command is then sent to the pitch system to initiate a shutdown. In response to the regulated grid voltage not exceeding the first voltage threshold, the connection between the grid and the pitch system and the voltage regulator module is maintained.

15. The high-voltage ride-through control method according to claim 13 or 14, characterized in that, After sending a shutdown command to the pitch system, in response to the detected grid voltage not exceeding a first voltage threshold, the connection between the grid and the pitch system is made closed, and the connection between the grid and the voltage regulator module is made open, and a startup command is sent to the pitch system to initiate startup; and / or After the shutdown command is sent to the pitch system, in response to the detected grid voltage being greater than a first voltage threshold and not greater than a second voltage threshold, the connection between the grid and the pitch system is made open, and the connection between the grid and the voltage regulator module is made closed to regulate the grid voltage. If the regulated grid voltage is not greater than the first voltage threshold, the power-on command is sent to the pitch system to start the system.

16. The high-voltage ride-through control method according to claim 15, characterized in that, The first voltage threshold is the maximum supply voltage supported by the high-voltage ride-through control of the pitch system itself. The second voltage threshold is the maximum input voltage supported by the voltage regulator module when it performs voltage regulation to provide a normal supply voltage to the pitch system. When or after sending a shutdown command or a startup command to the pitch system, a shutdown message indicating that the pitch system will shut down or a startup message indicating that the pitch system will start up will be sent to the main controller of the wind turbine.

17. The high-voltage ride-through control method according to claim 16, characterized in that, The system communicates with the pitch system via an external communication module to send start-up or stop commands and / or communicates with the main controller to send start-up or stop information. The magnitude of the grid voltage and / or the regulated grid voltage is detected by a voltage detector outside the pitch system. The connection status between the power grid and the voltage regulator module and pitch system is controlled by controlling the switch connected between the power grid and the voltage regulator module and pitch system.

18. The high-voltage ride-through control method according to claim 15, characterized in that, The steps of the controller opening the connection between the grid and the pitch system, opening the connection between the grid and the voltage regulator module, and sending a shutdown command to the pitch system to initiate a shutdown in response to the regulated grid voltage exceeding a first voltage threshold include: the controller opening the connection between the grid and the pitch system, opening the connection between the grid and the voltage regulator module, and sending a shutdown command to the pitch system to initiate a shutdown in response to the regulated grid voltage exceeding a first voltage threshold during a first duration of voltage regulation. The step of the controller maintaining the connection between the power grid and the pitch system and the voltage regulator module in response to the regulated grid voltage not exceeding a first voltage threshold includes: the controller maintaining the connection between the power grid and the pitch system and the voltage regulator module in response to the regulated grid voltage not exceeding the first voltage threshold after voltage regulation has been performed for a first duration. If the regulated grid voltage is not greater than the first voltage threshold, the controller sends a start-up command to the pitch system to start up. The steps include: if the regulated grid voltage is not greater than the first voltage threshold for a second duration, the controller sends a start-up command to the pitch system to start up.

19. The high-voltage ride-through control method according to claim 18, characterized in that, The high-voltage ride-through control method further includes: determining a first duration based on the grid voltage, wherein the higher the grid voltage, the shorter the first duration.

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