Wind turbine blade hoisting circuit and converter control method

Abstract

The application provides a wind turbine blade hoisting circuit and a converter control method. The wind turbine blade hoisting circuit comprises: a converter module connected with a generator of a wind turbine, the generator comprising a plurality of windings, each winding being provided with a corresponding converter module, the converter module comprising a total controller, the total controller being used to control the corresponding converter module to output corresponding current, and in the plurality of converter modules, the total controller of one of the converter modules is a master device, the master device being used to determine a total target current according to a current angle and weight of a wind wheel of the wind turbine, divide the total target current into a plurality of sub-target currents, and control the corresponding converter module to output the corresponding sub-target current to the corresponding group of windings according to the corresponding sub-target current; a slave device being configured to control the corresponding converter module to output the corresponding sub-target current to the corresponding group of windings according to the corresponding sub-target current. The stability of the hoisting process can be improved.

Description

Technical Field

[0001] This application relates to the field of wind power technology, and in particular to a wind turbine blade hoisting circuit and converter control method. Background Technology

[0002] With the continuous development of wind power technology, wind turbines are gradually becoming more characterized by tall towers and large rotors.

[0003] One installation procedure for wind turbine units is as follows: constructing a concrete foundation, installing the tower on the foundation, installing the nacelle on the tower, and installing the blades on the hub of the nacelle. Installing the blades on the hub requires a generator to drive the hub to rotate sequentially to and maintain a designated position, which necessitates providing the generator with a sufficiently large current.

[0004] In related technologies, during the blade hoisting process, a converter is needed to convert electrical energy to provide the current required by the generator, but the stability of the hoisting circuit is poor. Summary of the Invention

[0005] The purpose of this application is to provide a highly stable wind turbine blade hoisting circuit and converter control method.

[0006] This application embodiment provides a wind turbine blade hoisting circuit for providing torque during the process of assembling the blade to the hub of the wind turbine, thereby changing or maintaining the position of the hub. The hoisting circuit includes:

[0007] A converter module, connected to the generator of the wind turbine, is used to provide current to the generator as needed, thereby providing torque to the hub and changing or maintaining the position of the hub.

[0008] The generator includes multiple windings, each winding is provided with a corresponding converter module, and each converter module is configured to supply power separately.

[0009] The converter module also includes a main controller, which is used to control the corresponding converter module to output the corresponding current. Among the multiple converter modules, the multiple main controllers are electrically connected to each other, and any one of the main controllers is electrically connected to the other main controllers. The main controller of one converter module is the master device, and the main controllers of the other converter modules are the slave devices.

[0010] The main device is used to determine the total target current value based on the current angle and weight of the wind turbine rotor, divide the total target current value into multiple sub-target current values, allocate them to itself and slave devices, and the total target current value is the sum of the multiple sub-target current values;

[0011] The main device is configured to control its corresponding converter module to output the corresponding sub-target current to a corresponding set of windings based on the sub-target current value it corresponds to;

[0012] The slave device is configured to control the corresponding converter module to output the corresponding sub-target current to the corresponding set of windings according to the corresponding sub-target current value.

[0013] Optionally, when the converter module corresponding to the slave device fails or loses power, the master device controls the corresponding slave device to control at least one of the converter modules that have not failed or lost power to output the maximum rated current of the converter module, provide torque to the hub, and stop the wind turbine in a safe position, wherein the safe position is the position in which the wind turbine remains stationary in its natural state.

[0014] Optionally, when the converter module corresponding to the master device fails or the converter module corresponding to the master device loses power, at least one of the slave devices controls the output current of its corresponding converter module to decrease to 0 at a set slope.

[0015] Optionally, the converter module further includes a converter and a converter controller connected to the converter. The converter controller is connected to the main controller. When multiple converter modules are powered off, the multiple converter controllers are used to control the corresponding converter to be short-circuited.

[0016] Optionally, the hoisting circuit also includes multiple pairs of hoisting power input terminals connected to the multiple converter modules. The multiple pairs of hoisting power input terminals are used to connect to multiple independent hoisting power supplies and receive power from the corresponding hoisting power supply respectively.

[0017] Optionally, the converter module includes a machine-side converter and a grid-side converter. The machine-side converter includes a machine-side input terminal and a machine-side output terminal, and the grid-side converter includes a grid-side input terminal and a grid-side output terminal. The machine-side input terminal is used to connect to the generator of the wind turbine, and the grid-side input terminal is connected to the machine-side output terminal.

[0018] A switching circuit connects the grid-side output terminal and the turbine-side input terminal, and also connects the grid-side output terminal and the power grid. During blade hoisting, the switching circuit connects the grid-side output terminal and the turbine-side input terminal, and disconnects the grid-side output terminal from the power grid. When the wind turbine is working, the switching circuit disconnects the grid-side output terminal from the turbine-side input terminal and connects the grid-side output terminal to the power grid.

[0019] The hoisting power input terminal is connected between the machine-side output terminal and the grid-side input terminal, and is used to receive electrical energy during the blade hoisting process;

[0020] The control system is connected to the switching circuit to control the operation of the switching circuit, and is also connected to the converter to control the converter to convert the electrical energy received at the lifting power input terminal during the blade hoisting process and output the converted electrical energy to the generator. When the wind turbine is working, the control system also controls the converter to convert the electrical energy generated by the generator.

[0021] Optionally, the control system includes the main controller, as well as the machine-side controller and the grid-side controller. The main controller is connected to the machine-side controller and the grid-side controller, respectively. The machine-side controller and the grid-side controller are electrically connected to the converter, respectively.

[0022] The main controller is used to control the machine-side controller and the grid-side controller, and the control includes at least: during the blade hoisting process, controlling the machine-side controller to control the machine-side converter and the grid-side converter.

[0023] This application provides a wind turbine converter control method, including: a generator with multiple sets of windings, and multiple converter modules corresponding to the multiple sets of windings. The multiple converter modules are configured to supply power separately. Each converter module also includes a master controller, which is used to control the corresponding converter module to output a corresponding current. Among the multiple converter modules, the multiple master controllers are electrically connected to each other, and each master controller is electrically connected to the other master controllers. The master controller of one converter module is the master device, and the master controllers of the other converter modules are slave devices.

[0024] The main equipment determines the total target current value based on the current angle and weight of the wind turbine rotor.

[0025] The master device divides the total target current value into multiple sub-target current values ​​and allocates them to the master device and each of the slave devices. The master device and each of the slave devices control the corresponding converter module to output the corresponding sub-target current to a corresponding set of windings based on its corresponding sub-target current value. The total target current value is the sum of the multiple sub-target current values.

[0026] The slave device controls the corresponding converter module to output the corresponding sub-target current to the corresponding set of windings based on the corresponding sub-target current value.

[0027] Optionally, control methods include:

[0028] In the event of a fault in the converter module corresponding to the slave device or a power failure in the converter module corresponding to the slave device, the master device controls the converter module that has not issued a fault or power failure to output the maximum rated current to provide torque to the hub, thereby stopping the wind turbine in a safe position, wherein the safe position is the position in which the wind turbine remains stationary under natural conditions.

[0029] Optionally, control methods include:

[0030] When the converter module corresponding to the master device malfunctions or loses power, the slave device controls the output current of the corresponding converter module to decrease to 0 at a set slope.

[0031] Optionally, control methods include:

[0032] The converter module further includes a converter and a converter controller connected to the converter. The converter controller is connected to the main controller. When all the converter modules are powered off, the converter controllers control their corresponding converters to short-circuit.

[0033] The wind turbine blade hoisting circuit of this application embodiment includes a generator comprising multiple windings. Each winding is connected to a corresponding converter module, and the multiple converter modules are configured to supply power separately. Each converter module includes a master controller, with one converter module's master controller being a slave controller, and the master and slave controllers being electrically connected. The master controller determines the total target current value based on the current angle and weight of the wind turbine rotor, divides the total target current value into multiple sub-target current values, and controls the corresponding converter module to output the corresponding sub-target current to the corresponding set of windings based on the corresponding sub-target current value. The slave devices control the corresponding converter module to output the corresponding sub-target current to the corresponding set of windings based on the corresponding sub-target current value. In this way, multiple converter modules are controlled separately, which can improve the stability of the hoisting process. Attached Figure Description

[0034] Figure 1 The figure shown is a three-dimensional structural schematic diagram of a wind turbine generator set according to one embodiment of this application;

[0035] Figure 2 As shown Figure 1 The diagram shows a hub and blades of a wind turbine during the blade hoisting process, with one blade being assembled to the hub;

[0036] Figure 3 As shown Figure 1 The diagram shows another example of a wind turbine hub and blades during the blade hoisting process, with two blades being assembled to the hub.

[0037] Figure 4 As shown Figure 1 The diagram shown illustrates the blade hoisting process of a wind turbine, where three blades are assembled to the hub.

[0038] Figure 5 The diagram shown is a partial circuit diagram of a wind turbine blade hoisting circuit according to one embodiment of this application.

[0039] Figure 6 As shown Figure 5 The diagram shows a control system for the wind turbine blade hoisting circuit.

[0040] Figure 7 As shown Figure 5 The circuit diagram shown is the equivalent circuit diagram of the wind turbine blade hoisting circuit during the blade hoisting process.

[0041] Figure 8 As shown Figure 5 The diagram shows the equivalent circuit diagram of the wind turbine blade hoisting circuit during wind turbine operation.

[0042] Figure 9 The diagram shown is a flowchart of a control method for a wind turbine converter in one embodiment of this application. Detailed Implementation

[0043] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses consistent with some aspects of this application as detailed in the appended claims.

[0044] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. Unless otherwise defined, the technical or scientific terms used in this application should be understood in their ordinary sense by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar words used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "an" or "a" and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one. "A plurality" or "several" indicates two or more. The terms "comprising" or "including," and similar words mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. The terms "connected" or "linked," and similar words are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect. The singular forms "a," "the," and "the" used in this application specification and appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0045] This application embodiment provides a wind turbine blade hoisting circuit for providing torque during the process of assembling the blade to the hub of the wind turbine, thereby changing or maintaining the position of the hub. The hoisting circuit includes:

[0046] A converter module, connected to the generator of the wind turbine, is used to provide current to the generator as needed, thereby providing torque to the hub and changing or maintaining the position of the hub.

[0047] The generator includes multiple windings, each winding is provided with a corresponding converter module, and each converter module is configured to supply power separately.

[0048] The converter module also includes a main controller, which is used to control the corresponding converter module to output the corresponding current. Among the multiple converter modules, the multiple main controllers are electrically connected to each other, and any one of the main controllers is electrically connected to the other main controllers. The main controller of one converter module is the master device, and the main controllers of the other converter modules are the slave devices.

[0049] The main device is used to determine the total target current value based on the current angle and weight of the wind turbine rotor, divide the total target current value into multiple sub-target current values, allocate them to itself and slave devices, and the total target current value is the sum of multiple sub-target current values;

[0050] The main device is configured to control its corresponding converter module to output the corresponding sub-target current to a corresponding set of windings based on the sub-target current value it corresponds to;

[0051] The slave device is configured to control the corresponding converter module to output the corresponding sub-target current to the corresponding set of windings according to the corresponding sub-target current value.

[0052] The wind turbine blade hoisting circuit of this application embodiment includes a generator comprising multiple windings. Each winding is connected to a corresponding converter module. Each converter module includes a master controller, with the master controller of one converter module being a master device and the master controllers of the other converter modules being slave devices. The master device determines the total target current value based on the current angle and weight of the wind turbine rotor, divides the total target current value into multiple sub-target current values, and controls the corresponding converter module to output the corresponding sub-target current to the corresponding set of windings based on the sub-target current value. The slave devices control the corresponding converter module to output the corresponding sub-target current to the corresponding set of windings based on the corresponding sub-target current value. In this way, multiple converter modules are controlled separately, which improves the stability of the hoisting process.

[0053] Wind power generation converts the kinetic energy of wind into mechanical kinetic energy, and then into electrical kinetic energy. The device used for wind power generation is called a wind turbine. This application provides a wind turbine blade hoisting circuit and a wind turbine blade hoisting method. The following detailed description, in conjunction with the accompanying drawings, further illustrates this application.

[0054] Figure 1 This application describes a wind turbine generator set 10 according to one embodiment, comprising: a tower 20, a nacelle 21, and a rotor 22. The nacelle 21 is mounted on top of the tower 20, and the tower 20 supports the nacelle 21. The rotor 22 is mounted on the nacelle 21 and includes a hub 25 and blades 26 mounted on the hub 25. In this embodiment, the rotor 22 is mounted at the front of the nacelle 21; in other embodiments, the rotor 22 may be mounted at the rear of the nacelle 21. The number of blades 26 is three; in other examples, the number of blades 26 can be set according to actual conditions.

[0055] The wind turbine 22 is a component that converts the kinetic energy of the wind into mechanical energy. When the wind blows towards the blades 26, the aerodynamic force generated on the blades 26 drives the wind turbine 22 to rotate. A generator connected to the wind turbine 22 can be installed inside the nacelle 21. The rotation of the wind turbine 22 drives the rotor inside the generator to rotate, thereby generating electricity.

[0056] Figures 2 to 4 This is a schematic diagram of the blade hoisting process according to one embodiment of this application. The description uses a wind turbine 22 with three blades 26 as an example. Figure 2As shown, the hub 25 is controlled to rotate, causing the first part 251 on the hub 25 where the blade 26 needs to be installed to rotate to a designated position A and remain at the designated position A. Ground lifting equipment then lifts the blade 26 to the designated position A, allowing the blade 26 to be installed on the first part 251, thus completing the installation of one blade 26. Figure 3 As shown, continue controlling the rotation of the hub 25, causing the second part 252 on the hub 25 where the blade 26 needs to be installed to rotate to the designated position A and remain at the designated position A. The ground lifting equipment then lifts the blade 26 to the designated position A, allowing the blade 26 to be installed on the second part 252, thus completing the installation of another blade 26. Figure 4 As shown, the hub 25 continues to rotate, causing the third part 253 on the hub 25 where the blade 26 needs to be installed to rotate to a designated position A and remain at position A. The ground lifting equipment then lifts the blade 26 to the designated position A, installing the blade 26 onto the third part 253, thus completing the installation of another blade 26. It should be noted that each designated position A can be the same position or different positions. In this embodiment, each designated position A is the same position, which reduces the difficulty of lifting the blade 26 by the ground lifting equipment and also reduces the space occupied by the ground lifting equipment.

[0057] As described above regarding the blade hoisting scheme, the generator can provide torque to the hub 25, causing it to rotate or remain at a designated position A. When the hub 25 is held at position A, a static torque needs to be applied to it. This static torque is typically 1.1-1.2 times the generator's rated torque. Since a typical converter can only output about 60% of its rated current, a converter with approximately twice the capacity is required to meet the requirements. Customizing a converter is costly, and hoisting it in and out is complex, resulting in high construction difficulty. Please refer to [reference needed]. Figure 5 This application provides a wind turbine blade hoisting circuit 200 (hereinafter referred to as hoisting circuit 200) for providing torque during the assembly of wind turbine blades 26 to the hub 25 of wind turbine 10, thereby changing or maintaining the position of the hub 25. The hoisting circuit 200 includes a converter module 600 and a generator 300.

[0058] The converter module 600 is connected to the generator 300 of the wind turbine 10 and provides the generator 300 with the target current as needed, thereby providing torque to the hub 25 and changing or maintaining the position of the hub 25.

[0059] The generator 300 includes multiple windings, and each winding is equipped with a corresponding converter module 600. The converter module 600 includes a main controller 241 (see...). Figure 6The main controller 241 controls the corresponding converter module 600 to output the corresponding current. Among the multiple converter modules 600, the main controller 241 of one converter module 600 is the master device, and the main controllers 241 of the other converter modules 600 are slave devices. The master device determines the total target current value based on the current angle and weight of the wind turbine rotor 22 of the wind turbine 10, divides the total target current value into multiple sub-target currents, allocates them to each slave device, and also acquires the sub-target current itself. Each slave device and the master device itself will control the corresponding converter module 600 to output the corresponding sub-target current to the corresponding set of windings according to its corresponding sub-target current value. In some embodiments, the master device and slave devices can be manually defined. In some embodiments, the master device and slave devices can be set in the program, and the master device and slave devices can recognize each other.

[0060] Based on the corresponding sub-target current value, the device controls the corresponding converter module 600 to output the corresponding sub-target current to the corresponding set of windings.

[0061] The wind turbine blade hoisting circuit 200 of this embodiment includes a generator 300 comprising multiple windings. Each winding is connected to a converter module 600, which includes a master controller 241. Multiple master controllers 241 are electrically connected to each other, and each master controller 241 is electrically connected to the others. One master controller 241 of the converter modules 600 is the master device, and the master controllers 241 of the other converter modules 600 are slave devices. The master device determines the total target current value based on the current angle and weight of the rotor 22 of the wind turbine 10, divides the total target current value into multiple sub-target current values, and controls the corresponding converter module 600 to output the corresponding sub-target current to the corresponding set of windings based on the corresponding sub-target current value. The slave devices control the corresponding converter module 600 to output the corresponding sub-target current to the corresponding set of windings based on the corresponding sub-target current value. In this way, multiple converter modules 600 are controlled separately, which can improve the stability of the hoisting process.

[0062] In some embodiments, the converter module 600 includes a converter 210, a switching circuit 220, a hoisting power input terminal 230, and a control system 240 (e.g., Figure 6 (As shown).

[0063] The converter 210 includes a machine-side converter 211 and a grid-side converter 212. The machine-side converter 211 includes a machine-side input terminal 2111 and a machine-side output terminal 2112 (e.g., ...). Figure 5 As shown), the generator-side converter 211 can be connected to the generator 300 via the generator-side input terminal 2111. The grid-side converter 212 includes a grid-side input terminal 2121 and a grid-side output terminal 2122 (as shown). Figure 5As shown), the network-side input terminal 2121 can be connected to the machine-side output terminal 2112.

[0064] The hoisting power input terminal 230 is connected between the machine-side output terminal 2112 and the grid-side output terminal 2122, and is used to receive electrical energy during the hoisting of the blade 26. The hoisting power input terminal 230 can be connected to a DC power supply to receive electrical energy from the DC power supply. In some embodiments, a capacitor 280 can be provided between the machine-side output terminal 2112 and the grid-side output terminal 2122. The capacitor 280 is connected in parallel between the two machine-side output terminals 2112 and can serve as a filter.

[0065] Switching circuit 220 connects grid-side output terminal 2122 and turbine-side input terminal 2111, and also connects grid-side output terminal 2122 to the power grid. During the installation of blade 26, switching circuit 220 connects grid-side output terminal 2122 to turbine-side input terminal 2111 and disconnects grid-side output terminal 2122 from the power grid 400. When wind turbine 10 is operating, switching circuit 220 disconnects grid-side output terminal 2122 from turbine-side input terminal 2111 and connects grid-side output terminal 2122 to the power grid 400.

[0066] In some embodiments, the switching circuit 220 may include a first switch 221 and a second switch 222. The first switch 221 connects the grid-side output terminal 2122 and the machine-side input terminal 2111, and the second switch 222 connects the grid-side output terminal 2122 and the power grid. In other embodiments, the switching circuit 220 may also include a single-pole double-throw switch (not shown). The single-pole double-throw switch connects the grid-side output terminal 2122 and the machine-side input terminal 2111, and also connects the grid-side output terminal 2122 and the power grid. This can save costs and simplify the switching circuit 220.

[0067] Figure 6 The diagram shows a schematic of the control system 240 for the wind turbine installation circuit. The control system 240 may include a main controller 241, a turbine-side controller 242, and a grid-side controller 243. The main controller 241 is connected to the turbine-side controller 242 and the grid-side controller 243, respectively. The main controller 241 can receive external commands and control the wind turbine 10 according to those commands.

[0068] The main controller 241 can send commands to the machine-side controller 242 and the grid-side controller 243 to control them. The machine-side controller 242 and the grid-side controller 243 can control the machine-side converter 211 and the grid-side converter 212 according to the received commands. In some embodiments, the machine-side controller 242 and the grid-side controller 243 can output corresponding PWM signals to the machine-side converter 211 and the grid-side converter 212 according to the received commands. In some embodiments, the main controller 241 can be an ARM (RISC processor, Advanced RISC Machine) controller, and the machine-side controller 242 and the grid-side controller 243 can be DSP (Digital Signal Processing) controllers; this application does not impose any limitations on this.

[0069] In some embodiments, the control system 240 may further include a wave generator controller 244 and a unit interface board 245. The wave generator controller 244 is connected to the machine-side controller 242 and the grid-side controller 243, respectively, and can receive instructions from the machine-side controller 242 and the grid-side controller 243. In some embodiments, the wave generator controller 244 may be an FPGA (Field Programmable Gate Array) controller. The wave generator controller 244 and the unit interface board 245 are electrically connected, and the unit interface board 245 is electrically connected to the machine-side converter 211 and the grid-side converter 212, respectively. The machine-side controller 242 and the grid-side controller 243 are electrically connected to the machine-side converter 211 and the grid-side converter 212 through the wave generator controller 244 and the unit interface board 245. The unit interface board 245 can receive instructions from the wave generator controller 244 and send out the instructions from the wave generator controller 244 to control the operation of the machine-side converter 211 and / or the grid-side converter 212. Its main function is to transmit PWM signals through optical fiber to control the IGBT operation. There can be multiple unit interface boards 245. For example, the machine-side converter 211 can correspond to two unit interface boards 245, which can be used to transmit signals to the machine-side converter 211, thereby controlling the machine-side converter 211; similarly, the grid-side converter 212 can correspond to two unit interface boards 245, which can be used to send signals to the grid-side converter 212, thereby controlling the grid-side converter 212.

[0070] The switching circuit 220 is connected to the control system 240. The control system 240 can be used to control the operation of the switching circuit 220. In some embodiments, the control system 240 may also include a switch controller 246, which is used to control the operation of the switching circuit 220. In other embodiments, a master controller 241 can be used to control the operation of the switching circuit 220. Using a master controller 241 to control the operation of the switching circuit 220 can reduce the number of components used and lower costs.

[0071] The control system 240 is used to control the converter 210 to convert the electrical energy received by the hoisting power input terminal 230 during the hoisting process of the blade 26, and output the converted electrical energy to the generator 300. When the wind turbine 10 is working, the control system 240 controls the converter 210 to convert the electrical energy generated by the generator 300.

[0072] Figure 7 The diagram shows the equivalent circuit diagram of the hoisting circuit during the hoisting process. During blade hoisting, the control system 240 controls the switch circuit 220 to connect the grid-side output terminal 2122 with the machine-side input terminal 2111, and disconnect the grid-side output terminal 2122 from the power grid 400. The control system 240 controls the converter 210 to convert the electrical energy received at the hoisting power input terminal 230 and output the converted electrical energy to the generator 300.

[0073] In some embodiments, the main controller 241 controls the machine-side controller 242 during blade hoisting, enabling the machine-side controller 242 to control both the machine-side converter 211 and the grid-side converter 212. During blade hoisting, the hoisting power input terminal 230 is connected to a DC power supply, and both the machine-side converter 211 and the grid-side converter 212 are used as inverters. Therefore, the main controller 241 can control the machine-side controller 242, which in turn controls both the machine-side converter 211 and the grid-side converter 212. This allows for simultaneous control of both the machine-side converter 211 and the grid-side converter 212 without the grid-side controller 243's involvement, reducing the number of components required.

[0074] Figure 8The diagram shows the equivalent circuit of wind turbine 10 during operation. When wind turbine 10 is operating, the control system 240 controls the switching circuit 220 to disconnect the grid-side output terminal 2122 from the turbine-side input terminal 2111, and connect the grid-side output terminal 2122 to the power grid 400. The control system also controls the converter 210 to convert the electrical energy generated by the generator 300. The generator 300 outputs AC power to the turbine-side converter 211. The main controller 241 controls the turbine-side controller 242 and the grid-side controller 243. The turbine-side controller 242 then controls the turbine-side converter 211 to rectify the AC power into DC power, and the grid-side controller 243 controls the grid-side converter 212 to invert the DC power back into AC power before supplying it to the power grid 400, thus meeting grid connection requirements. When wind turbine 10 is operating, the hoisting power input terminal 230 receives no power. The hoisting power input terminal 230 can be disconnected from the hoisting power supply.

[0075] The blade hoisting circuit 200 in some embodiments of this application is based on the wind turbine 10's own machine-side converter 211 and grid-side converter 212. The control system 240 controls the operation of the switching circuit 220. During the blade 26 hoisting process, the switching circuit 220 connects the grid-side output terminal 2122 with the machine-side input terminal 2111 and disconnects the grid-side input terminal 2121 from the power grid 400. Both the machine-side converter 211 and the grid-side converter 212 are used for power conversion. This can meet the large current required during the blade 26 hoisting process, without the need for additional custom converters for blade 26 hoisting, which can reduce costs. It also eliminates the need to consider the hoisting in and out of the custom converter, reducing construction difficulty.

[0076] The main controller 241 is used to determine the target current based on the current angle and weight of the rotor 22 of the wind turbine 10. In some embodiments, the current angle of the rotor 22 can be acquired by an angle sensor, which is electrically connected to the main controller 241, and the angle signal acquired by the angle sensor is transmitted to the main controller 241. In some embodiments, the weight of the rotor 22 can also be acquired by a weight sensor, which is electrically connected to the main controller 241, and the electrical signal acquired by the weight sensor is transmitted to the main controller 241. In other embodiments, the weights of the blades 26 installed on the same hub 25 are generally equal. Therefore, the weight of the rotor 22 can be determined by the number of blades 26 installed on the hub 25, given that the weight of a single blade 26 and the weight of the hub 25 are known. The weight of a single blade 26 and the weight of the hub 25 can be determined by relevant parameters of the blades 26 and the hub 25, or they can be weighed on the ground before the wind turbine 10 is installed.

[0077] The main controller 241 is used to determine whether the current angle of the wind turbine 22 is equal to the target angle. When multiple blades 26 are installed on the hub 25, the target angle can be the same or different angles. When the target angle is the same, the positions on the hub 25 where the blades 26 need to be installed can be rotated sequentially to the same angle for blade installation, reducing the difficulty of lifting the blades 26.

[0078] If the current angle of the wind turbine 22 is not equal to the target angle, the main controller 241 determines the first target current based on the target angle, the current angle of the wind turbine 22, and the weight of the wind turbine 22. Before all the blades 26 are installed, the center of gravity of the wind turbine 22 is not located at the hub 25, and the center of gravity will change as the wind turbine 22 rotates. Therefore, the generator 300 needs to output torque corresponding to the current angle of the wind turbine 22 to drive the wind turbine 22 to rotate to the target angle.

[0079] If the current angle of the wind turbine 22 is equal to the target angle, the main controller 241 determines the second target current based on the current angle and weight of the wind turbine 22. When the generator 300 drives the wind turbine 22 to rotate to the target angle, the generator 300 needs to output a torque to keep the wind turbine 22 at the current angle. At this time, the torque output by the generator 300 is the static torque.

[0080] The main controller 241 controls the generator-side controller 242 based on the target current, thereby controlling the generator-side converter 211 and the grid-side converter 212 to output the target current to the generator 300. The main controller 241 sends a target current command to the generator-side controller 242 based on the determined target current. The generator-side controller 242 can output a corresponding PWM command based on the target current command and send it to the waveform controller 244. The waveform controller 244 sends control signals to the generator-side converter 211 and the grid-side converter 212 through the corresponding unit interface boards 245 of the generator-side controller 242 and the grid-side controller 243, thereby causing the generator-side converter 211 and the grid-side converter 212 to output the target current to the generator 300. The generator 300 outputs the corresponding torque based on the target current.

[0081] When the current angle of the wind turbine 22 is not equal to the target angle, the main controller 241 determines the first target current and sends the first target current command to the generator-side controller 242. The generator-side controller 242 controls the generator-side converter 211 and the grid-side converter 212 to output the first target current according to the first target current command, so that the generator 300 drives the wind turbine 22 to rotate.

[0082] When the current angle of the wind turbine 22 is equal to the target angle, the main controller 241 determines the second target current and sends the second target current command to the turbine-side controller 242. The turbine-side controller 242 controls the turbine-side converter 211 and the grid-side converter 212 to output the second target current according to the second target current command, so that the generator 300 outputs torque, thereby keeping the wind turbine 22 at the target angle and installing the blades 26.

[0083] In some embodiments, the actual current of the generator 300 can be fed back to the generator-side controller 242, which can adjust the output current in real time according to the actual current so that the actual current is equal to or close to the target current. In this way, the target current can be output more accurately to meet the torque required during hoisting.

[0084] In some embodiments, the generator 300 may include a single winding, which is a set of three-phase windings. In other embodiments, the generator 300 may include multiple sets of windings, such as two, three, or more sets, with each three-phase winding forming a set of windings. The converter 210 includes a plurality of converters 210 connected corresponding to the multiple sets of windings. Each converter 210 includes a generator-side converter 211 and a grid-side converter 212.

[0085] In some embodiments, the hoisting power input terminal 230 includes multiple pairs of hoisting power input terminals 230 corresponding to multiple converters 210. These multiple pairs of hoisting power input terminals 230 are used to connect to multiple independent hoisting power supplies, each receiving power from its corresponding hoisting power supply. In this way, multiple hoisting power supplies independently deliver power to multiple converters 210, without interfering with each other, thus improving the reliability of the hoisting circuit 200. All multiple hoisting power supplies can be DC power supplies. In other embodiments, the multiple hoisting power input terminals 230 can also be connected to the same hoisting power supply and powered by the same hoisting power supply.

[0086] The hoisting circuit 200 also includes a converter controller 290 (e.g., connected to a plurality of converters 210 respectively) Figure 6 (As shown). The converter controller 290 includes a machine-side controller 242 and a grid-side controller 243. The hoisting circuit 200 also includes multiple master controllers 241 corresponding to the multiple converter controllers 290. One of the multiple master controllers 241 is a master device, and the rest are slave devices. The master device and the slave devices are connected. The master device can obtain the current angle and weight of the wind turbine 22.

[0087] For example, a generator 300 with two sets of windings has two master controllers 241. One master controller 241 can be selected as the master device, and the other master controller 241 as the slave device. The master device can send signals to the slave device. A generator 300 with three sets of windings has three master controllers 241. One master controller 241 can be selected as the master device, and the other two master controllers as slave devices. The master device can send signals to the two slave devices.

[0088] The main equipment is used to determine the total target current value based on the current angle and weight of the wind turbine 22 of the wind turbine 10. The total target current value may also include a first total target current value and a second total target current value. The first total target current value can make the wind turbine 22 rotate, and the second total target current value can make the wind turbine 22 maintain at the target angle. For details, please refer to the previous text.

[0089] The main equipment is used to divide the total target current value into multiple sub-target current values. In some embodiments, the total target current value can be divided into multiple sub-target current values ​​equally according to the number of winding groups, or it can be divided into sub-target current values ​​using other methods instead of equally dividing according to the number of winding groups.

[0090] The main equipment controls the corresponding converter controller 290 based on its own corresponding sub-target current value, thereby controlling the corresponding converter 210 to output the corresponding sub-target current to the corresponding set of windings. The main equipment sends a sub-target current command to the corresponding converter controller 290 based on the sub-target current that the converter 210 should output. The converter controller 290 then controls the converter 210 to output the sub-target current according to the sub-target current command, thereby supplying the corresponding set of windings to the main equipment.

[0091] The slave device controls the corresponding converter controller 290 based on the corresponding sub-target current value, thereby controlling the corresponding converter 210 to output the corresponding sub-target current to the corresponding set of windings. The master device sends its corresponding sub-target current value signal to the slave device, and the slave device sends a sub-target current value command to its corresponding converter controller 290. The converter controller 290 controls the converter 210 to output the sub-target current according to the sub-target current value command, thereby supplying the corresponding winding of the slave device.

[0092] The main equipment determines the total target current value and divides it into multiple sub-target current values. The main equipment and the slave equipment control the corresponding converter 210 to output the sub-target current value according to its corresponding sub-target current value. In this way, multiple converters 210 are controlled separately, which can improve the stability of the control system during hoisting.

[0093] In addition to the above-described embodiment of the multi-winding generator 300, this application also provides a different control strategy based on different fault types of the hoisting circuit 200 to improve safety during the hoisting process.

[0094] In some embodiments, if the converter 210 corresponding to the slave device fails or the converter module 600 corresponding to the slave device loses power, the master device controls the converter module that has not failed or lost power to output the maximum rated current, providing torque to the hub 25 to stop the wind turbine 22 in a safe position, which is the position where the wind turbine 22 remains stationary in its natural state. This prevents the wind turbine 22 from falling directly due to gravity and damaging the wind turbine 10.

[0095] In some embodiments, the hoisting circuit 200 may include a slave device. When the inverter 210 corresponding to this slave device fails or the hoisting power input terminal 230 corresponding to the slave device loses power, the master device controls its corresponding inverter controller 290 to control the output current of its corresponding inverter 210, and the generator 300 then drives the wind turbine 22 to stop at a safe position. When the inverter 210 corresponding to the master device does not fail or the hoisting power input terminal 230 corresponding to the slave device does not lose power, the master device can obtain the real-time angle of the wind turbine 22, determine the safe angle of the wind turbine 22, and then drive the wind turbine 22 to the safe angle. In some embodiments, the corresponding current can be determined based on the current angle of the wind turbine 22, or the inverter 210 can be controlled to output the maximum current to ensure that the wind turbine 22 stops at a safe position. In some embodiments, the safe position can be the position where the wind turbine 22 remains stationary in its natural state. In other embodiments, the hoisting circuit 200 may include at least two slave devices. When all the converters 210 corresponding to the slave devices fail or the hoisting power input terminal 230 corresponding to the slave devices loses power, the control strategy is the same as the control strategy of the hoisting circuit 200 including one slave device. When some of the converters 210 corresponding to the slave devices fail or the hoisting power input terminal 230 corresponding to the slave devices loses power, the master device determines the total output current and divides the total output current into multiple sub-output currents, wherein the number of multiple sub-output currents is the same as the number of converters 210 that have not failed or lost power, thereby controlling the output current of multiple converters 210, and the generator 300 drives the wind turbine 22 to stop at a safe position.

[0096] In some embodiments, if the converter 210 corresponding to the main equipment fails or the converter module 600 corresponding to the main equipment loses power, the slave equipment controls the output current of the corresponding converter module 600 to decrease to 0 at a set slope. Under this fault type, the main equipment cannot participate in the control of the hoisting circuit 200, cannot determine the current angle of the wind turbine 22, and therefore cannot determine the safe angle of the wind turbine 22. The output current of the converters 210 corresponding to multiple slave equipment decreasing to 0 at a set slope allows the wind turbine 22 to smoothly stop at a safe position under the combined action of its own inertia and the output torque of the generator 300, improving the safety of the wind turbine 10 during hoisting. In other embodiments, if the converter 210 corresponding to the main device fails or the converter module 600 corresponding to the main device loses power, a new main device is defined in the slave device that has not failed. The new main device determines the total output current and divides the total output current into multiple sub-output currents. The number of multiple sub-output currents is the same as the number of converters 210 that have not failed or lost power. This controls the output current of the multiple converters 210, and the generator 300 drives the wind turbine 22 to a safe position.

[0097] In some embodiments, when multiple converter modules 600 lose power and multiple pairs of hoisting power input terminals 230 lose power, multiple converter controllers 290 control their corresponding converters 210 to short-circuit. When multiple pairs of hoisting power input terminals 230 lose power, the hoisting circuit 200 has no power source. The multiple converter controllers 290 control the multiple converters 210 to short-circuit, outputting the electrical energy stored in the converters 210 to provide torque to the wind turbine 22, preventing sudden changes in the motion state of the wind turbine 22 and causing damage to the components of the wind turbine 10. The converter 210 may include multiple IGBTs. The converter controller 290 controls the multiple IGBTs to short-circuit, thereby outputting the electrical energy in the converter 210. When multiple converters 210 are short-circuited, the output current of the multiple converters 210 is generally relatively large, better ensuring the safety of the wind turbine 10. In other embodiments, the main controller 241 can directly control the wave generator controller 244 to control the output current of the converter 210.

[0098] In some embodiments, the IGBT contains a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) and a diode. When the current is too large when multiple converters 210 are shorted and breaks down the MOSFET, the diode can work normally, and the main controller 241 stops controlling the machine-side controller 242 and the grid-side controller 243.

[0099] This application also provides a wind turbine converter control method applied to the aforementioned wind turbine blade hoisting circuit 200. A control system 240 is also applied to the aforementioned wind turbine blade hoisting circuit 200.

[0100] A generator 300 with multiple sets of windings and multiple converter modules 600 corresponding to the multiple sets of windings are provided. The multiple converter modules 600 are configured to supply power separately. Each converter module 600 also includes a master controller 241, which is used to control the corresponding converter module 600 to output the corresponding current. Among the multiple converter modules 600, the multiple master controllers 241 are electrically connected to each other. Each master controller 241 is electrically connected to the other master controllers 241. The master controller 241 of one converter module 600 is the master device, and the master controllers 241 of the other converter modules are slave devices.

[0101] Please refer to Figure 9 The wind turbine converter control method includes steps S101 to S103:

[0102] In step S101, the main equipment determines the total target current value based on the current angle and weight of the wind turbine rotor of the wind turbine 10.

[0103] In step S102, the main device divides the total target current value into multiple sub-target current values, and controls the corresponding converter module 600 to output the corresponding sub-target current to the corresponding set of windings according to the corresponding sub-target current value. The total target current value is the sum of multiple sub-target current values.

[0104] In step S103, the slave device controls the corresponding converter module 600 to output the corresponding sub-target current to the corresponding set of windings according to the corresponding sub-target current value.

[0105] In some embodiments, if the converter 210 corresponding to the slave device fails or the converter module 600 corresponding to the slave device loses power, the master device controls the converter module 600, which has not failed or lost power, to output the maximum rated current to provide torque to the hub 25, so that the wind turbine 22 stops at a safe position, wherein the safe position is the position in which the wind turbine 22 remains stationary in its natural state.

[0106] In some embodiments, if the converter module 600 corresponding to the main device fails or the converter module 600 corresponding to the main device loses power, the output current of the converter module 600 is reduced to 0 at a set slope by the slave device control.

[0107] In some embodiments, the converter module 600 further includes a converter 210 and a converter controller 290 connected to the converter 210. The converter controller 290 is connected to the main controller 241. When all converter modules 600 are powered off, the multiple converter controllers 290 control their corresponding converters 210 to be short-circuited.

[0108] For the method embodiments, since they basically correspond to the circuit embodiments, the relevant parts can be referred to in the description of the circuit embodiments. The method embodiments and the circuit embodiments complement each other.

[0109] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A wind turbine blade hoisting circuit, characterized in that, The hoisting circuit, used to provide torque during the assembly of the blades to the hub of the wind turbine, and to change or maintain the position of the hub, includes: A converter module, connected to the generator of the wind turbine, is used to provide current to the generator as needed, thereby providing torque to the hub and changing or maintaining the position of the hub. The generator includes multiple sets of windings, each set of windings is provided with a corresponding converter module, and each converter module is configured to supply power separately; The converter module also includes a main controller, which is used to control the corresponding converter module to output the corresponding current. Among the multiple converter modules, the multiple main controllers are electrically connected to each other, and any one of the main controllers is electrically connected to the other main controllers. The main controller of one converter module is the master device, and the main controllers of the other converter modules are the slave devices. The main device is used to determine the total target current value based on the current angle and weight of the wind turbine rotor, divide the total target current value into multiple sub-target current values, allocate them to itself and slave devices, and the total target current value is the sum of multiple sub-target current values; The main device is configured to control its corresponding converter module to output the corresponding sub-target current to a corresponding set of windings based on the sub-target current value it corresponds to; The slave device is configured to control the corresponding converter module to output the corresponding sub-target current to the corresponding set of windings according to the corresponding sub-target current value; When the converter module corresponding to the master device fails or the converter module corresponding to the master device loses power, at least one of the slave devices controls the output current of its corresponding converter module to decrease to 0 at a set slope.

2. The wind turbine blade hoisting circuit according to claim 1, characterized in that, When the converter module corresponding to the slave device fails or loses power, the master device controls the corresponding slave device to control at least one of the converter modules that have not failed or lost power to output the maximum rated current of the converter module, so as to provide torque to the hub and stop the wind turbine in a safe position, wherein the safe position is the position in which the wind turbine remains stationary in its natural state.

3. The wind turbine blade hoisting circuit according to claim 1, characterized in that, The converter module also includes a converter and a converter controller connected to the converter. The converter controller is connected to the main controller. When multiple converter modules are powered off, the multiple converter controllers are used to control the corresponding converter to short-circuit itself.

4. The wind turbine blade hoisting circuit according to claim 1, characterized in that, It also includes multiple pairs of hoisting power input terminals connected to the multiple converter modules, the multiple pairs of hoisting power input terminals being used to connect to multiple independent hoisting power supplies, and respectively receive power from the corresponding hoisting power supply.

5. The wind turbine blade hoisting circuit according to claim 1, characterized in that, The converter module includes a machine-side converter and a grid-side converter. The machine-side converter includes a machine-side input terminal and a machine-side output terminal. The grid-side converter includes a grid-side input terminal and a grid-side output terminal. The machine-side input terminal is used to connect to the generator of the wind turbine unit. The grid-side input terminal is connected to the machine-side output terminal. A switching circuit connects the grid-side output terminal and the turbine-side input terminal, and also connects the grid-side output terminal and the power grid. During blade hoisting, the switching circuit connects the grid-side output terminal and the turbine-side input terminal, and disconnects the grid-side output terminal from the power grid. When the wind turbine is working, the switching circuit disconnects the grid-side output terminal from the turbine-side input terminal and connects the grid-side output terminal to the power grid. The hoisting power input terminal is connected between the machine-side output terminal and the grid-side input terminal, and is used to receive electrical energy during the blade hoisting process; The control system is connected to the switching circuit to control the operation of the switching circuit, and is also connected to the converter to control the converter to convert the electrical energy received at the lifting power input terminal during the blade hoisting process and output the converted electrical energy to the generator. When the wind turbine is working, the control system also controls the converter to convert the electrical energy generated by the generator.

6. The wind turbine blade hoisting circuit according to claim 5, characterized in that, The control system includes the main controller, as well as the machine-side controller and the grid-side controller. The main controller is connected to the machine-side controller and the grid-side controller, respectively. The machine-side controller and the grid-side controller are electrically connected to the converter. The main controller is used to control the machine-side controller and the grid-side controller, and the control includes at least: during the blade hoisting process, controlling the machine-side controller to control the machine-side converter and the grid-side converter.

7. A control method for a wind turbine converter, characterized in that, include: A generator with multiple sets of windings and multiple converter modules corresponding to the multiple sets of windings are provided. The multiple converter modules are configured to supply power separately. Each converter module also includes a master controller, which is used to control the corresponding converter module to output a corresponding current. Among the multiple converter modules, the multiple master controllers are electrically connected to each other. Each master controller is electrically connected to the other master controllers. The master controller of one converter module is the master device, and the master controllers of the other converter modules are slave devices. The main equipment determines the total target current value based on the current angle and weight of the wind turbine rotor. The master device divides the total target current value into multiple sub-target current values ​​and allocates them to the master device and each of the slave devices. The master device and each of the slave devices control the corresponding converter module to output the corresponding sub-target current to the corresponding set of windings according to the corresponding sub-target current value. The total target current value is the sum of multiple sub-target current values. When the converter module corresponding to the master device fails or loses power, the slave device controls the output current of the converter module corresponding to the slave device to decrease to 0 at a set slope.

8. The wind turbine converter control method according to claim 7, characterized in that, include: In the event of a fault in the converter module corresponding to the slave device or a power failure in the converter module corresponding to the slave device, the master device controls the converter module that has not issued a fault or power failure to output the maximum rated current to provide torque to the hub, thereby stopping the wind turbine in a safe position, wherein the safe position is the position in which the wind turbine remains stationary under natural conditions.

9. The wind turbine converter control method according to claim 7, characterized in that, include: The converter module also includes a converter and a converter controller connected to the converter. The converter controller is connected to the main controller. When multiple converter modules lose power, the multiple converter controllers control their corresponding converters to short-circuit themselves.

Images