CN115664280A

CN115664280A - Wind turbine generator blade hoisting circuit and converter control method

Info

Publication number: CN115664280A
Application number: CN202211392987.7A
Authority: CN
Inventors: 王思奇; 刘嘉明; 吴立建
Original assignee: Shanghai Electric Wind Power Group Co Ltd
Current assignee: Shanghai Electric Wind Power Group Co Ltd
Priority date: 2022-11-08
Filing date: 2022-11-08
Publication date: 2023-01-31

Abstract

The application provides a wind turbine blade hoisting circuit and a converter control method. Wind turbine generator system blade hoist and mount circuit includes: the converter modules are connected with a generator of the wind turbine generator, the generator comprises a plurality of windings, each winding is correspondingly provided with a converter module, each converter module comprises a master controller, the master controller is used for controlling the corresponding converter module to output corresponding current, the master controller of one of the converter modules is a main device, the main device is used for determining total target current according to the current angle and weight of a wind wheel of the wind turbine generator, dividing the total target current into a plurality of sub-target currents, and controlling the corresponding converter module to output the corresponding sub-target current to the corresponding group of windings according to the sub-target current corresponding to the main device; the slave device is configured to control the corresponding current transformation 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

Wind turbine generator blade hoisting circuit and converter control method

Technical Field

The application relates to the technical field of wind power, in particular to a blade hoisting circuit of a wind turbine generator and a converter control method.

Background

With the continuous development of wind power technology, wind turbine generators gradually tend to be high towers and large impellers.

One of the installation steps of the wind turbine generator is as follows: the method comprises the steps of building foundation concrete of the wind turbine, installing a tower on the foundation concrete, installing a cabin on the tower, and installing blades on a hub of the cabin. When blades are mounted on the hub, the generator is required to drive the hub to rotate to a set position in sequence and keep the hub at the set position, and sufficient current needs to be provided for the generator.

In the related art, during the hoisting process of the blade, a converter is required to convert electric energy to provide current required by the generator, but the stability of a hoisting circuit is poor.

Disclosure of Invention

The embodiment of the application aims to provide a high-stability wind turbine blade hoisting circuit and a converter control method.

The embodiment of the application provides a wind turbine generator system blade hoist and mount circuit, be used for the blade assemble extremely the in-process of the wheel hub of wind turbine generator system provides the moment of torsion, changes or keeps the wheel hub position, hoist and mount circuit includes:

the current transformation module is connected with a generator of the wind turbine generator set and used for providing the generator with current according to the requirement, so that the torque is provided for the hub, and the position of the hub is changed or maintained;

the generator comprises a plurality of windings, each winding is correspondingly provided with one converter module, and each converter module is configured to supply power respectively;

the current transformation modules further comprise a master controller, the master controller is used for controlling the corresponding current transformation modules to output corresponding currents, in the plurality of current transformation modules, the master controllers are electrically connected with one another, any master controller is electrically connected with the other master controllers, the master controller of one current transformation module is a master device, and the master controllers of the other current transformation modules are slave devices;

the main equipment is used for determining a total target current value according to the current angle and weight of a wind wheel of the wind turbine generator, dividing the total target current value into a plurality of sub-target current values and distributing the sub-target current values to the main equipment and the slave equipment, wherein the total target current value is the sum of the sub-target current values;

the main equipment is configured to control the converter module corresponding to the main equipment to output the corresponding sub-target current to the corresponding group of windings according to the sub-target current value corresponding to the main equipment;

and the slave equipment is configured to control the corresponding current converting module to output the corresponding sub-target current to the corresponding group of windings according to the corresponding sub-target current value.

Optionally, when the converter module corresponding to the slave device fails or the converter module corresponding to the slave device fails to operate, the master device controls the corresponding slave device, controls at least one of the converter modules which do not fail or fail to operate to output the maximum rated current of the converter module, and provides a torque for the hub to stop the wind wheel at a safe position, where the safe position is a position at which the wind wheel remains stationary in a natural state.

Optionally, when the converter module corresponding to the master device fails or the converter module corresponding to the master device is powered off, at least one of the slave devices is configured to control the output current of the converter module corresponding to the slave device to decrease to 0 with a set slope.

Optionally, the converter modules further include a converter and a converter controller correspondingly connected to the converter, the converter controller is correspondingly connected to the master controller, and the converter controllers are used to control the short circuit of the corresponding converter when the converter modules are all powered down.

Optionally, the hoisting circuit further includes a plurality of pairs of hoisting power supply input ends correspondingly connected to the plurality of current transforming modules, and the plurality of pairs of hoisting power supply input ends are connected to a plurality of mutually independent hoisting power supplies and respectively receive power supplied by the corresponding hoisting power supplies.

Optionally, the converter module includes a machine side converter and a grid side converter, the machine side converter includes a machine side input end and a machine side output end, the grid side converter includes a grid side input end and a grid side output end, the machine side input end is used for being connected with a generator of the wind turbine generator, and the grid side input end is connected with the machine side output end;

the switch circuit is connected with the network side output end and the machine side input end and is also connected with the network side output end and a power grid, the switch circuit is communicated with the network side output end and the machine side input end and is disconnected with the power grid in the blade hoisting process, and when the wind turbine generator works, the switch circuit is disconnected with the network side output end and the machine side input end and is communicated with the network side output end and the power grid;

the hoisting power supply input end is connected between the machine side output end and the network side input end and is used for receiving electric energy in the blade hoisting process;

and the control system is connected with the switch circuit, is used for controlling the switch circuit to act, is connected with the converter, and is used for controlling the converter to convert the electric energy received by the hoisting power supply input end in the blade hoisting process, outputting the converted electric energy to the generator, and controlling the converter to convert the electric energy generated by the generator when the wind turbine generator works.

Optionally, the control system includes the master controller, a machine-side controller and a grid-side controller, the master controller is connected to the machine-side controller and the grid-side controller respectively, and the machine-side controller and the grid-side controller are electrically connected to the converter respectively;

the master controller is used for controlling the machine side controller and the network side controller, and the control at least comprises: and in the process of hoisting the blade, controlling the machine side controller to control the machine side converter and the grid side converter.

The embodiment of the application provides a wind turbine converter control method, which comprises the following steps: the generator comprises a generator for providing a plurality of groups of windings, and a plurality of converter modules arranged corresponding to the plurality of groups of windings, wherein the plurality of converter modules are configured to supply power respectively, each converter module further comprises a master controller, the master controller is used for controlling the corresponding converter module to output corresponding current, in the plurality of converter modules, the master controllers are electrically connected with each other, any master controller is electrically connected with the rest master controllers, the master controller of one converter module is a master device, and the master controllers of the other converter modules are slave devices;

determining a total target current value according to the current angle and weight of a wind wheel of the wind turbine generator set through the main equipment;

dividing the total target current value into a plurality of sub-target current values by the master equipment, and distributing the sub-target current values to the master equipment and each slave equipment, wherein the master equipment and each slave equipment 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 values, and the total target current value is the sum of the plurality of sub-target current values; and

and controlling the corresponding current transformation module to output the corresponding sub-target current to the corresponding group of windings through the slave equipment according to the corresponding sub-target current value.

Optionally, the control method includes:

under the condition that the current converting module corresponding to the slave equipment fails or the current converting module corresponding to the slave equipment is powered off, the current converting module which does not fail or is not powered off is controlled by the master equipment to output a maximum rated current to provide torque for a hub, so that the wind wheel stops at a safe position, wherein the safe position is a position at which the wind wheel keeps static in a natural state.

Optionally, the control method includes:

when the converter module corresponding to the master device fails or the converter module corresponding to the master device is powered off, the output current corresponding to the converter module is controlled by the slave device to be reduced to 0 by a set slope.

Optionally, the control method includes:

the converter modules further comprise converters and converter controllers correspondingly connected with the converters, the converter controllers are correspondingly connected with the master controller, and under the condition that the converter modules are powered off, the converter controllers control the corresponding converters to be in short circuit.

The wind turbine blade hoisting circuit provided by the embodiment of the application has the advantage that the generator comprises a plurality of windings. Each winding is correspondingly connected with a current conversion module, the current conversion modules are configured to supply power respectively, each current conversion module comprises a master controller, the master controller of one current conversion module is a master device, the master controllers of the other current conversion modules are slave devices, the master device is electrically connected with the slave devices, the master device determines a total target current value according to the current angle and weight of a wind wheel of the wind turbine generator, divides the total target current value into a plurality of sub-target current values, controls the corresponding current conversion module to output corresponding sub-target currents to the corresponding group of windings according to the corresponding sub-target current value, and controls the corresponding current conversion module to output corresponding sub-target currents to the corresponding group of windings according to the corresponding sub-target current value. Therefore, the plurality of converter modules are respectively controlled, and the stability of the hoisting process can be improved.

Drawings

Fig. 1 is a schematic perspective view of a wind turbine generator shown in an embodiment of the present application;

FIG. 2 is a schematic view of a hub and blades of the wind turbine shown in FIG. 1 during blade lifting, with one blade assembled to the hub;

FIG. 3 is a further schematic view of the hub and blades of the wind turbine shown in FIG. 1 during blade lifting, wherein two blades are assembled to the hub;

FIG. 4 is another schematic view of the wind turbine shown in FIG. 1 during blade lifting, wherein three blades are assembled to the hub;

FIG. 5 is a partial circuit diagram of a wind turbine blade lifting circuit shown in an embodiment of the present application;

FIG. 6 is a schematic diagram of a control system of the wind turbine blade lifting circuit shown in FIG. 5;

FIG. 7 is an equivalent circuit diagram of the blade hoisting circuit of the wind turbine generator shown in FIG. 5 in the process of hoisting the blade;

FIG. 8 is an equivalent circuit diagram of the wind turbine blade lifting circuit shown in FIG. 5 when the wind turbine is in operation;

fig. 9 is a flowchart illustrating a control method of a wind turbine converter according to an embodiment of the present application.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present application. Rather, they are merely examples of devices consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

the main equipment is used for determining a total target current value according to the current angle and weight of a wind wheel of the wind turbine generator, dividing the total target current value into a plurality of sub-target current values, distributing the sub-target current values to the main equipment and the slave equipment, and the total target current value is the sum of the sub-target current values;

the main equipment is configured to control the current transformation module corresponding to the main equipment to output the corresponding sub-target current to the corresponding group of windings according to the sub-target current value corresponding to the main equipment;

the slave equipment is configured to control the corresponding current transformation module to output the corresponding sub-target current to the corresponding group of windings according to the corresponding sub-target current value.

The wind turbine blade hoisting circuit provided by the embodiment of the application has the advantage that the generator comprises a plurality of windings. Each winding is correspondingly connected with a current converting module, each current converting module comprises a master controller, the master controller of one current converting module is a master device, the master controllers of the other current converting modules are slave devices, the master device determines a total target current value according to the current angle and weight of a wind wheel of the wind turbine generator, divides the total target current value into a plurality of sub-target current values, controls the corresponding current converting module to output corresponding sub-target currents to the corresponding group of windings according to the corresponding sub-target current values, and controls the corresponding current converting module to output corresponding sub-target currents to the corresponding group of windings according to the corresponding sub-target current values. Therefore, the plurality of converter modules are respectively controlled, and the stability of the hoisting process can be improved.

Wind power generation is to convert kinetic energy of wind into mechanical kinetic energy and then convert the mechanical kinetic energy into electrical kinetic energy. The wind power generation device is called a wind turbine. The application provides a wind turbine blade hoisting circuit and a wind turbine blade hoisting method. The present application will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a wind turbine generator 10 according to an embodiment of the present application, including: a tower 20, a nacelle 21, a wind rotor 22. Wherein a nacelle 21 is mounted on top of a tower 20, the tower 20 supporting the nacelle 21. A wind rotor 22 is mounted to nacelle 21, and wind rotor 22 includes a hub 25 and blades 26 mounted to hub 25. In the present embodiment, the rotor 22 is mounted at the front of the nacelle 21, and in other embodiments, the rotor 22 may be mounted at the rear of the nacelle 21. The number of blades 26 is three, and in other examples, the number of blades 26 can be set according to actual conditions.

The rotor 22 is a component for converting kinetic energy of wind into mechanical energy, and when the wind blows to the blades 26, aerodynamic force is generated on the blades 26 to drive the rotor 22 to rotate. A generator connected with the wind wheel 22 can be arranged in the nacelle 21, and the rotation of the wind wheel 22 drives a rotor inside the generator to rotate, so as to generate electricity.

Fig. 2 to 4 are schematic views of a blade hoisting process according to an embodiment of the present application. A three blade 26 rotor 22 is illustrated. As shown in fig. 2, the hub 25 is controlled to rotate, the first portion 251 of the hub 25, where the blade 26 needs to be installed, is rotated to a specified position a and is kept at the specified position a, the ground hoisting equipment hoists the blade 26 to the specified position a, and the blade 26 is installed at the first portion 251, so that the installation of one blade 26 is completed. As shown in fig. 3, the hub 25 is continuously controlled to rotate, so that the second portion 252 of the hub 25, where the blade 26 needs to be installed, is rotated to the designated position a and is kept at the designated position a, the ground hoisting equipment hoists the blade 26 to the designated position a, and the blade 26 is installed at the second portion 252, so as to complete the installation of another blade 26. As shown in fig. 4, the hub 25 is continuously controlled to rotate, so that the third portion 253 of the hub 25, where the blade 26 needs to be installed, is rotated to the designated position a and is kept at the designated position a, the ground hoisting equipment hoists the blade 26 to the designated position a, so that the blade 26 is installed at the third portion 253, and the installation of another blade 26 is completed. The designated positions a may be the same position or different positions. In this embodiment, each designated position a is the same position, which can reduce the difficulty of lifting the blade 26 by the ground lifting equipment and also reduce the occupation of the ground space by the ground lifting equipment.

As with the blade lift arrangement described above, the generator may provide torque to the hub 25 to rotate or hold the hub 25 in the desired position A. When the hub 25 is kept at the designated position A, static torque needs to be applied to the hub 25, the static torque is generally 1.1-1.2 times of the rated torque of the generator, and because a common converter can only output about 60% of rated current, a converter with capacity about 2 times needs to be customized to meet the requirements, the customized converter is high in customization cost, the customized converter is complex to hoist in and out, and the construction difficulty is high. Referring to fig. 5, the present embodiment provides a wind turbine blade lifting circuit 200 (hereinafter referred to as lifting circuit 200) for providing torque and changing or maintaining the position of the hub 25 during the process of assembling the fan blade 26 to the hub 25 of the wind turbine 10. The hoist circuit 200 includes a converter module 600 and a generator 300.

Converter module 600 is coupled to generator 300 of wind turbine 10 to provide generator 300 with a target current as needed to provide torque to hub 25 to change or maintain hub 25 position.

The generator 300 includes a plurality of windings, each winding is correspondingly provided with a converter module 600, each converter module 600 includes a master controller 241 (see fig. 6), the master controller 241 controls the corresponding converter module 600 to output a corresponding current, and in the plurality of converter modules 600, the master controller 241 of one converter module 600 is a master device, and the master controllers 241 of the other converter modules 600 are slave devices. The master device determines a total target current value according to the current angle and weight of the wind wheel 22 of the wind turbine generator 10, divides the total target current value into a plurality of sub-target currents, distributes the sub-target currents to each slave device, and obtains the sub-target currents by itself. Each slave device and the master device themselves control the corresponding current transformation module 600 to output the corresponding sub-target current to the corresponding group of windings according to the corresponding sub-target current value; in some embodiments, the master and slave devices may be defined manually. In some embodiments, the master device and the slave device may be set in a program, and the master device and the slave device may recognize each other.

The slave device controls the corresponding current transformation module 600 to output the corresponding sub-target current to the corresponding group of windings according to the corresponding sub-target current value.

In the wind turbine blade lifting circuit 200 according to the embodiment of the present application, the generator 300 includes a plurality of windings. Each winding is correspondingly connected with one current converting module 600, each current converting module 600 comprises a master controller 241, a plurality of master controllers 241 are electrically connected with one another, any master controller 241 is electrically connected with the rest of the master controllers 241, the master controller 241 of one current converting module 600 is a master device, the master controllers 241 of the other current converting modules 600 are slave devices, the master device determines a total target current value according to the current angle and weight of the wind wheel 22 of the wind turbine 10, divides the total target current value into a plurality of sub-target current values, controls the corresponding current converting module 600 to output corresponding sub-target currents to a corresponding group of windings according to the corresponding sub-target current values, and controls the corresponding current converting module 600 to output corresponding sub-target currents to the corresponding group of windings according to the corresponding sub-target current values. Therefore, the plurality of converter modules 600 are controlled respectively, and the stability of the hoisting process can be improved.

In some embodiments, the converter module 600 includes a converter 210, a switching circuit 220, a hoist power input 230, and a control system 240 (shown in fig. 6).

The converter 210 comprises a machine side converter 211 and a grid side converter 212. The machine side converter 211 includes a machine side input 2111 and a machine side output 2112 (as shown in fig. 5), and the machine side converter 211 can be connected to the generator 300 through the machine side input 2111. The grid-side converter 212 comprises a grid-side input 2121 and a grid-side output 2122 (as shown in fig. 5), and the grid-side input 2121 may be connected to the machine-side output 2112.

The hoisting power input 230 is connected between machine side output 2112 and net side output 2122 for receiving power during hoisting of the blade 26. The hoisting power input 230 may be connected to a dc power source for receiving power from the dc power source. In some embodiments, a capacitor 280 may be disposed between the machine side output 2112 and the grid side output 2122, and the capacitor 280 may be connected in parallel between the two machine side outputs 2112 to perform a filtering function.

Switching circuit 220 connects network-side output 2122 to machine-side input 2111, and connects network-side output 2122 to the grid. In the process of hoisting the blade 26, the switch circuit 220 connects the grid-side output end 2122 and the machine-side input end 2111, and disconnects the grid-side output end 2122 and the grid 400, and when the wind turbine generator 10 works, the switch circuit 220 disconnects the grid-side output end 2122 and the machine-side input end 2111, and connects the grid-side output end 2122 and the grid 400.

In some embodiments, the switching circuit 220 may include a first switch 221 and a second switch 222, the first switch 221 connecting the grid-side output 2122 and the grid-side input 2111, the second switch 222 connecting the grid-side output 2122 and the grid. In other embodiments, the switch circuit 220 may also include a single-pole double-throw switch (not shown) connecting the grid-side output 2122 and the grid-side input 2111 and connecting the grid-side output 2122 and the power grid, so as to save cost and simplify the switch circuit 220.

Fig. 6 is a schematic diagram of a control system 240 of the wind turbine generator lifting circuit. Control system 240 may include a general controller 241, a machine-side controller 242, and a network-side controller 243. The main controller 241 is connected to the machine-side controller 242 and the network-side controller 243, respectively. The general controller 241 may be configured to receive an external instruction and control the wind turbine 10 according to the external instruction.

The overall controller 241 may send instructions to the machine-side controller 242 and the network-side controller 243 to control the machine-side controller 242 and the network-side controller 243. The machine-side controller 242 and the grid-side controller 243 may 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 may output respective PWM signals to the machine-side converter 211 and the grid-side converter 212 according to the received instructions. In some embodiments, the overall controller 241 may be an ARM (RISC) controller, and the Machine-side controller 242 and the network-side controller 243 may be DSP (Digital Signal processing) controllers, which is not limited in this application.

In some embodiments, the control system 240 may also include a wave launch controller 244 and a unit interface board 245. The transmission controller 244 is connected to the machine-side controller 242 and the network-side controller 243, respectively, and the transmission controller 244 can receive commands from the machine-side controller 242 and the network-side controller 243. In some embodiments, the launch controller 244 may be an FPGA (Field Programmable Gate Array) controller. The generator controller 244 is electrically connected to a unit interface board 245, 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 network-side controller 243 are electrically connected to the machine-side converter 211 and the network-side converter 212 via the wave generation controller 244 and the unit interface board 245. The unit interface board 245 can receive the command from the wave-transmitting controller 244 and transmit the command from the wave-transmitting controller 244 to control the operation of the machine-side converter 211 and/or the grid-side converter 212. The main function is to send out the PWM signal through the optic fibre, control the IGBT action. The number of the unit interface board 245 may be plural. For example, the machine-side converter 211 can correspond to two unit interface boards 245, and the two unit interface boards 245 can be used for transmitting signals to the machine-side converter 211 to control the machine-side converter 211; the grid-side converter 212 may correspond to two cell interface boards 245, and the two cell interface boards 245 may be used to send signals to the grid-side converter 212 to control the grid-side converter 212.

The switching circuit 220 is connected to the control system 240. The control system 240 may 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, the switch controller 246 being configured to control the operation of the switching circuit 220. In other embodiments, the overall controller 241 may be used to control the switching circuit 220. The master controller 241 is adopted to control the action of the switch circuit 220, so that the use of devices can be reduced, and the cost is reduced.

The control system 240 is configured to control the converter 210 to convert the electric energy received by the hoisting power input end 230 during the hoisting of the blade 26, output the converted electric energy to the generator 300, and control the converter 210 to convert the electric energy generated by the generator 300 when the wind turbine 10 operates.

Fig. 7 is an equivalent circuit diagram of a hoisting circuit in the hoisting process. During the blade hoisting process, the control system 240 controls the switch circuit 220 to connect the grid-side output 2122 and the machine-side input 2111 and disconnect the grid-side output 2122 from the power grid 400. The control system 240 controls the converter 210 to convert the electric energy received by the hoisting power input end 230 and output the converted electric energy to the generator 300.

In some embodiments, the master controller 241 is used to control the machine-side controller 242 during the blade hoisting process, such that the machine-side controller 242 controls the machine-side converter 211 and the grid-side converter 212. In the blade hoisting process, the hoisting power input end 230 is connected with a direct current power supply, and the machine-side converter 211 and the grid-side converter 212 are both used as inverters, so that the machine-side controller 242 can be controlled by the master controller 241, and the machine-side controller 242 controls the machine-side converter 211 and the grid-side converter 212. In this way, the machine-side converter 211 and the grid-side converter 212 can be controlled simultaneously without the participation of the grid-side controller 243, and the use of the devices can be reduced.

Fig. 8 is an equivalent circuit diagram of the wind turbine 10 during operation. When the wind turbine generator 10 works, the control system 240 controls the switch circuit 220 to disconnect the grid-side output end 2122 and the machine-side input end 2111, connect the grid-side output end 2122 and the grid 400, and control the converter 210 to convert the electric energy generated by the generator 300. The generator 300 outputs alternating current to the machine-side converter 211, the master controller 241 controls the machine-side controller 242 and the grid-side controller 243 respectively, the machine-side controller 242 controls the machine-side converter 211 to rectify the alternating current into direct current, and the grid-side controller 243 controls the grid-side converter 212 to invert the direct current into alternating current and then transmit the alternating current to the power grid 400, so that grid connection requirements are met. When the wind turbine generator 10 is in operation, no electric energy is input to the hoisting power input end 230. The hoist power input 230 may be disconnected from the hoist power.

Blade hoist circuit 200 of some embodiments of this application, machine side converter 211 and net side converter 212 based on wind turbine generator system 10 itself, through control system 240 control switch circuit 220 action, in blade 26 hoist and mount in-process, switch circuit 220 intercommunication net side output 2122 and machine side input 2111, disconnection net side input 2121 and electric wire netting 400, machine side converter 211 and net side converter 212 all are used for the conversion of electric energy, so can satisfy the heavy current of blade 26 hoist and mount in-process demand, do not need additionally to customize the customization converter that is used for blade 26 to hoist, can reduce cost, also need not consider the hanging of customization converter and hang out, the construction degree of difficulty has been reduced.

The overall controller 241 is used to determine the target current according to the current angle and weight of the rotor 22 of the wind turbine 10. In some embodiments, the current angle of the wind turbine 22 may be acquired by an angle sensor electrically connected to the overall controller 241, and the angle signal acquired by the angle sensor is transmitted to the overall controller 241. In some embodiments, the weight of the wind turbine 22 may also be collected by a weight sensor electrically connected to the general controller 241, and the electric signal collected by the weight sensor is transmitted to the general controller 241. In other embodiments, the weight of blades 26 mounted to the same hub 25 is generally equal, and thus, the weight of the rotor 22 may also be determined by the number of blades 26 already mounted to the hub 25 given the weight of an individual blade 26 and the weight of the hub 25. The weight of the individual blades 26 and the weight of the hub 25 can be determined by the relevant parameters of the blades 26 and the hub 25, or can be weighed on the ground before the wind turbine 10 is installed.

The overall controller 241 is used to determine whether the current angle of the wind wheel 22 is equal to the target angle. When a plurality of blades 26 are mounted on the hub 25, the target angle may be the same angle or different angles. When the target angle is the same angle, the positions of the hub 25 where the blades 26 need to be installed can be sequentially rotated to the same angle to install the blades 26, so that the difficulty in hoisting the blades 26 is reduced.

If the current angle of the wind wheel 22 is not equal to the target angle, the general controller 241 is configured to determine a first target current according to the target angle, the current angle of the wind wheel 22, and the weight of the wind wheel 22. Before all the blades 26 are completely installed, the center of gravity of the wind wheel 22 is not located at the hub 25, and the center of gravity changes with the rotation of the wind wheel 22, so that the generator 300 needs to drive the wind wheel 22 to rotate according to the output torque corresponding to the current angle of the wind wheel 22, so that the wind wheel 22 rotates to the target angle.

If the current angle of the wind wheel 22 is equal to the target angle, the general controller 241 determines a second target current according to the current angle of the wind wheel 22 and the weight of the wind wheel 22. When the generator 300 drives the wind rotor 22 to rotate to the target angle, the generator 300 needs to output a torque for keeping the wind rotor 22 at the current angle, and the torque output by the generator 300 is a static torque.

The main controller 241 controls the machine-side controller 242 according to the target current to control the machine-side converter 211 and the grid-side converter 212 to output the target current to the generator 300. The master controller 241 transmits a target current command to the machine-side controller 242 according to the determined target current, the machine-side controller 242 outputs a corresponding PWM command according to the target current command and transmits the PWM command to the wave-transmitting controller 244, the wave-transmitting controller 244 transmits a control signal to the machine-side converter 211 and the grid-side converter 212 through the unit interface boards 245 corresponding to the machine-side controller 242 and the grid-side controller 243, so that the machine-side converter 211 and the grid-side converter 212 output the target current to the generator 300, and the generator 300 outputs a corresponding torque according to the target current.

When the current angle of the wind turbine 22 is not equal to the target angle, the master controller 241 determines a first target current, sends a first target current instruction to the machine-side controller 242, and the machine-side controller 242 controls the machine-side converter 211 and the grid-side converter 212 to output the first target current according to the first target current instruction, so that the generator 300 drives the wind turbine 22 to rotate.

When the current angle of the wind turbine 22 is equal to the target angle, the main controller 241 determines a second target current, sends a second target current instruction to the machine-side controller 242, and the machine-side controller 242 controls the machine-side converter 211 and the grid-side converter 212 to output the second target current according to the second target current instruction, so that the generator 300 outputs a torque, and the wind turbine 22 is maintained at the target angle, and the blades 26 are installed.

In some embodiments, the actual current of the generator 300 may be fed back to the machine-side controller 242, and the machine-side controller 242 may adjust the output current in real time based on the actual current to make the actual current equal to or close to the target current. Therefore, the target current can be more accurately output to meet the torque required in the hoisting process.

In some embodiments, generator 300 may include a single winding, which is a set of three-phase windings. In other embodiments, generator 300 may include multiple sets of windings, such as two, three, or more sets, one for each three-phase winding. The current transformer 210 includes a plurality of current transformers 210 connected to the plurality of sets of windings correspondingly. Each converter 210 comprises a machine side converter 211 and a grid side converter 212.

In some embodiments, the hoisting power input terminals 230 include a plurality of pairs of hoisting power input terminals 230 correspondingly connected to the plurality of converters 210, and the pairs of hoisting power input terminals 230 are configured to be connected to a plurality of mutually independent hoisting power supplies, and respectively receive power supplied by the corresponding hoisting power supplies. Therefore, the plurality of hoisting power supplies respectively transmit electric energy to the plurality of converters 210, are independent of each other and do not interfere with each other, and can improve the reliability of the hoisting circuit 200. The plurality of hoisting power supplies can all be direct current power supplies. In other embodiments, multiple ceiling power inputs 230 may be connected to the same ceiling power supply and powered by the same ceiling power supply.

The hoist circuit 200 further includes a converter controller 290 (shown in fig. 6) coupled to the plurality of converters 210. The converter controller 290 includes a machine side controller 242 and a grid side controller 243. The hoisting circuit 200 further comprises a plurality of master controllers 241 correspondingly connected with the plurality of converter controllers 290, one of the master controllers 241 is a master device, and the rest are slave devices, and the master devices are connected with the slave devices. The primary device may obtain the current angle and weight of the wind rotor 22.

For example, the generator 300 with two sets of windings corresponds to two general controllers 241, one general controller 241 can be selected as a master, the other general controller 241 can be selected as a slave, and the master can send signals to the slave. The generator 300 with three groups of windings corresponds to three master controllers 241, one master controller 241 can be selected to be a master device, the other two master controllers are slave devices, and the master device can send signals to the two slave devices.

The main device is used for determining a total target current value according to the current angle and weight of the wind rotor 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, where the first total target current value may enable the wind wheel 22 to rotate, and the second total target current value may enable the wind wheel 22 to maintain at the target angle, which may be referred to in the foregoing.

The master device is configured to divide the total target current value into a plurality of sub-target current values. In some embodiments, the total target current value may be equally divided into a plurality of sub-target current values according to the number of groups of windings, or the total target current value may be divided into sub-target current values by other dividing methods instead of equally dividing according to the number of groups of windings.

The main device is configured to control the corresponding converter controller 290 according to the sub-target current value corresponding to the main device, so as to control the corresponding converter 210 to output the corresponding sub-target current to the corresponding group of windings. The main equipment sends a sub-target current instruction to the converter controller 290 corresponding to the main equipment according to the sub-target current which the converter 210 corresponding to the main equipment should output, and the converter controller 290 controls the converter 210 to output the sub-target current according to the sub-target current instruction, so as to supply the sub-target current to a group of windings corresponding to the main equipment.

The slave device is configured to control the corresponding converter controller 290 according to the corresponding sub-target current value, so as to control the corresponding converter 210 to output the corresponding sub-target current to the corresponding group of windings. The master equipment sends a sub-target current value signal corresponding to the slave equipment, the slave equipment sends a sub-target current value instruction to the converter controller 290 corresponding to the slave equipment, and the converter controller 290 controls the converter 210 to output the sub-target current according to the sub-target current value instruction so as to supply the sub-target current to a winding corresponding to the slave equipment.

The master device determines the total target current value and divides the total target current value into a plurality of sub-target current values, and the master device and the slave device control the corresponding converter 210 to output the sub-target current values according to the corresponding sub-target current values. Therefore, the converters 210 are controlled respectively, and the stability of a control system in the hoisting process can be improved.

For the above-mentioned embodiments of the multi-winding generator 300, the present application further provides different control strategies according to different fault types of the hoisting circuit 200, so as to improve the safety during the hoisting process.

In some embodiments, in the case that the converter 210 corresponding to the slave device fails or the converter module 600 corresponding to the slave device loses power, the master device is configured to control the converter module without failure or power failure to output the maximum rated current, so as to provide a torque to the hub 25 to stop the wind wheel 22 to the safe position, where the wind wheel 22 is kept stationary in the natural state. Thus, the wind wheel 22 can be prevented from directly falling down due to gravity to damage the wind turbine 10.

In some embodiments, the lifting circuit 200 may include a slave device, and when the converter 210 corresponding to the slave device fails or the lifting power input 230 corresponding to the slave device is powered down, the master device controls the converter controller 290 corresponding to the slave device to control the output current of the converter 210 corresponding to the slave device, and the generator 300 drives the wind turbine 22 to stop at a safe position. When the converter 210 corresponding to the master device fails or the hoisting power input end 230 corresponding to the slave device fails, the master device can acquire the real-time angle of the wind wheel 22, determine the safety angle of the wind wheel 22, and then drive the wind wheel 22 to the safety angle. In some embodiments, the corresponding current may be determined based on the current angle of the rotor 22, and the inverter 210 may be controlled to output the maximum current to ensure that the rotor 22 can be stopped at a safe position. In some embodiments, the safe position may be a position where the wind rotor 22 remains stationary in nature. In other embodiments, the hoist circuit 200 may include at least two slave devices. When all the converters 210 corresponding to the slave devices fail or the power of the hoisting power input 230 corresponding to the slave devices fails, the control strategy is the same as that of the hoisting circuit 200 including one slave device. When the converter 210 corresponding to a part of the slave devices fails or the hoisting power supply input end 230 corresponding to the slave devices is powered off, the master device determines the total output current and divides the total output current into a plurality of sub-output currents, wherein the number of the sub-output currents is the same as that of the converter 210 which does not fail or is not powered off, so that the output currents of the plurality of converters 210 are controlled, and the generator 300 drives the wind wheel 22 to stop at a safe position.

In some embodiments, in the case that the converter 210 corresponding to the master device fails or the converter module 600 corresponding to the master device is powered down, the slave device is configured to control the output current of the corresponding converter module 600 to decrease to 0 with a set slope. In this type of failure, the primary equipment cannot participate in the control of the lifting circuit 200, cannot determine the current angle of the wind rotor 22, and thus cannot determine the safe angle of the wind rotor 22. The output current of the converter 210 corresponding to the plurality of slave devices is reduced to 0 at a set slope, so that the wind wheel 22 can be stably stopped at a safe position under the combined action of the inertia of the wind wheel and the output torque of the generator 300, and the safety of the wind turbine generator set 10 in the hoisting process is improved. In other embodiments, in case that the converter 210 corresponding to the master device fails or the converter module 600 corresponding to the master device loses power, one master device is redefined in the slave devices which do not fail, the redefined master device determines the total output current and divides the total output current into a plurality of sub-output currents, wherein the number of the plurality of sub-output currents is the same as the number of the converters 210 which do not fail or lose power, so as to control the output currents of the plurality of converters 210, and the generator 300 drives the wind turbine 22 to stop at the safe position.

In some embodiments, when all of the plurality of converter modules 600 are powered down, and all of the pairs of hoisting power input terminals 230 are powered down, the plurality of converter controllers 290 control their corresponding converters 210 to be shorted. When a plurality of pairs of hoisting power supply input ends 230 are powered off, the hoisting circuit 200 has no electric energy source, the converter controllers 290 control the converters 210 to be in short circuit, the electric energy stored by the converters 210 is output, a torque is provided for the wind wheel 22, and the damage to the components of the wind turbine generator 10 caused by the sudden change of the motion state of the wind wheel 22 is avoided. The converter 210 may include a plurality of IGBTs, and the converter controller 290 controls the plurality of IGBTs to be shorted, thereby outputting power in the converter 210. When the plurality of converters 210 are in short circuit, the currents output by the plurality of converters 210 are generally large, and the safety of the wind turbine generator 10 is better guaranteed. In other embodiments, the overall controller 241 may directly control the ripple controller 244 to control the output current of the converter 210.

In some embodiments, a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) tube and a diode are disposed inside the IGBT, and when a current generated when the plurality of converters 210 are shorted breaks through the MOSFET tube due to an excessive current, the diode can work normally, and the main controller 241 stops controlling the machine-side controller 242 and the grid-side controller 243.

The application also provides a control method of the wind turbine converter, which is applied to the wind turbine blade hoisting circuit 200. The control system 240 is applied to the blade hoisting circuit 200 of the wind turbine generator.

The generator 300 is provided with a plurality of groups of windings, and a plurality of converter modules 600 are arranged corresponding to the plurality of groups of windings, the plurality of converter modules 600 are configured to supply power respectively, each converter module 600 further includes a master controller 241, the master controller 241 is used for controlling the corresponding converter module 600 to output corresponding current, in the plurality of converter modules 600, the plurality of master controllers 241 are electrically connected with each other, any master controller 241 is electrically connected with the rest master controllers 241, the master controller 241 of one converter module 600 is a master device, and the master controllers 241 of the other converter modules are slave devices.

Referring to fig. 9, the wind turbine converter control method includes steps S101 to S103:

in step S101, a total target current value is determined by the master device from the current angle and weight of the rotor of the wind turbine 10.

In step S102, the main device divides the total target current value into a plurality of sub-target current values, and controls the corresponding converter module 600 to output the corresponding sub-target current to the corresponding group of windings according to the corresponding sub-target current values, where the total target current value is the sum of the plurality of sub-target current values.

In step S103, the slave device controls the corresponding current transforming module 600 to output the corresponding sub-target current to the corresponding group of windings according to the corresponding sub-target current value.

In some embodiments, in the case that 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 does not fail or lose power to output the maximum rated current, so as to provide torque to the hub 25, and stop the wind wheel 22 at the safe position, where the safe position is a position where the wind wheel 22 is kept stationary in the natural state.

In some embodiments, in the case that the converter module 600 corresponding to the master device fails or the converter module 600 corresponding to the master device is powered down, the output current of the corresponding converter module 600 is controlled by the slave device to decrease to 0 with a set slope.

In some embodiments, the converter module 600 further includes a converter 210 and a converter controller 290 correspondingly connected to the converter 210, the converter controllers 290 are correspondingly connected to the main controller 241, and when the multiple converter modules 600 are all powered down, the multiple converter controllers 290 control their corresponding converters 210 to be short-circuited.

For the method embodiment, since it basically corresponds to the circuit embodiment, reference may be made to the partial description of the circuit embodiment for relevant points. The method embodiment and the circuit embodiment are complementary.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A wind turbine blade lifting circuit for providing torque, changing or maintaining the hub position during assembly of the blade to a hub of the wind turbine, the lifting circuit comprising:

the converter modules further comprise a master controller, the master controller is used for controlling the corresponding converter modules to output corresponding currents, the master controllers in the converter modules are electrically connected with one another, any master controller is electrically connected with the rest of the master controllers, the master controller of one converter module is a master device, and the master controllers of the other converter modules are slave devices;

2. The wind turbine blade hoisting circuit according to claim 1, wherein when the converter module corresponding to the slave device fails or the converter module corresponding to the slave device fails to power down, the master device controls the corresponding slave device, controls at least one of the converter modules which do not fail or power down to output the maximum rated current of the converter module, and provides torque for the hub to stop the wind turbine at a safe position, wherein the safe position is a position at which the wind turbine remains stationary in a natural state.

3. The wind turbine blade hoisting circuit according to claim 1, wherein when the converter module corresponding to the master device fails or the converter module corresponding to the master device fails, at least one of the slave devices is configured to control the output current of the converter module corresponding to the slave device to decrease to 0 at a set slope.

4. The wind turbine blade hoisting circuit according to claim 1, wherein the converter modules further comprise converters and converter controllers correspondingly connected with the converters, the converter controllers are correspondingly connected with the master controller, and the converter controllers are used for controlling the short circuit of the corresponding converters when the converter modules are powered off.

5. The wind turbine blade hoisting circuit according to claim 1, further comprising a plurality of pairs of hoisting power supply input ends correspondingly connected to the plurality of current transforming modules, wherein the plurality of pairs of hoisting power supply input ends are connected to a plurality of mutually independent hoisting power supplies and respectively receive power supplied by the corresponding hoisting power supplies.

6. The wind turbine blade hoisting circuit according to claim 1, wherein the converter module comprises a machine side converter and a grid side converter, the machine side converter comprises a machine side input end and a machine side output end, the grid side converter comprises a grid side input end and a grid side output end, the machine side input end is used for being connected with a generator of the wind turbine, and the grid side input end is connected with the machine side output end;

the switching circuit is connected with the network side output end and the machine side input end, and is also connected with the network side output end and a power grid, the switching circuit is communicated with the network side output end and the machine side input end and is disconnected with the power grid in the blade hoisting process, and the switching circuit is disconnected with the network side output end and the machine side input end and is communicated with the network side output end and the power grid when the wind turbine generator works;

the hoisting power supply input end is connected between the machine side output end and the net side input end and used for receiving electric energy in the process of hoisting the blade;

7. The wind turbine blade hoisting circuit according to claim 6, wherein the control system comprises the master controller, a machine side controller and a network side controller, the master controller is respectively connected with the machine side controller and the network side controller, and the machine side controller and the network side controller are respectively electrically connected with the converter;

the master controller is used for controlling the machine side controller and the network side controller, and the control at least comprises the following steps: and in the process of hoisting the blade, controlling the machine side controller to control the machine side converter and the grid side converter.

8. A wind turbine converter control method is characterized by comprising the following steps: the generator comprises a generator for providing a plurality of groups of windings, and a plurality of converter modules arranged corresponding to the plurality of groups of windings, wherein the plurality of converter modules are configured to supply power respectively, each converter module further comprises a master controller, the master controller is used for controlling the corresponding converter module to output corresponding current, in the plurality of converter modules, the master controllers are electrically connected with each other, any master controller is electrically connected with the rest master controllers, the master controller of one converter module is a master device, and the master controllers of the other converter modules are slave devices;

and controlling the corresponding current converting module to output the corresponding sub-target current to the corresponding group of windings through the slave equipment according to the corresponding sub-target current values.

9. The wind turbine converter control method according to claim 8, comprising:

under the condition that the converter module corresponding to the slave equipment fails or the converter module corresponding to the slave equipment is powered off, the main equipment controls the converter module which does not fail or is not powered off to output the maximum rated current to provide torque for the hub, so that the wind wheel stops at a safe position, wherein the safe position is a position at which the wind wheel keeps static in a natural state.

10. The wind turbine converter control method according to claim 8, comprising:

when the converter module corresponding to the master device fails or the converter module corresponding to the master device is powered off, the slave device controls the output current of the converter module corresponding to the slave device to be reduced to 0 by a set slope.

11. The wind turbine converter control method according to claim 8, comprising: