Control Circuit of Pitch Motor Brake, Wind Turbine Generator Set and Its Control Method

Abstract

A control circuit for a pitch motor brake, a wind power generation set and a control method thereof provided by the present application include: a controller, a first brake control circuit, a second brake control circuit, a brake control device and a detection circuit; wherein, an output end of the controller is connected to an input end of the first brake control circuit, an output end of the first brake control circuit is connected to the brake control device, an output end of the controller is connected to an input end of the second brake control circuit, an output end of the second brake control circuit is connected to the brake control device, the detection circuit is connected to the controller, the detection circuit is used for detecting the position of a blade of the pitch motor and generating detection information to be sent to the controller, and the controller is used for controlling the first brake control circuit to work or controlling the second brake control circuit to work according to the detection information.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation, and particularly to a control circuit for a pitch motor brake, a wind turbine generator set, and a control method thereof. Background Art

[0002] When a wind turbine generator set captures wind energy, the pitch blades are driven to unfold by a pitch motor. When the pitch blades reach a specified position, the pitch blades are fixed by a motor brake to achieve a stable power output. Moreover, when the unit performs power control, it will frequently execute the operations of retracting the pitch blades and opening the pitch blades, resulting in frequent actions of the motor brake. Frequent actions of the brake relay will accelerate the aging of the relay, shorten the service life, and increase the failure rate of the unit. In addition, when the wind turbine generator set is in the power generation state, when a fault occurs in the pitch blade brake circuit, since the motor brake cannot be opened, the motor cannot drive the pitch blade to a safe position. At this time, the faulty pitch blade will still capture wind energy, while the other two pitch blades are in the safe position, which will cause an unbalanced force on the three pitch blades and increase the risk of the wind turbine generator set. In addition, when a fault occurs in the pitch blade brake circuit, since the motor brake cannot be opened, the servo driver will try to retract the pitch blades by increasing the driving current. At this time, the temperature of the motor will rise sharply, which may damage the motor. Summary of the Invention

[0003] In view of the above problems, the present application provides a control circuit for a pitch motor brake, a wind turbine generator set, and a control method thereof. The control circuit for the pitch motor brake includes: a controller, a first brake control circuit, a second brake control circuit, a brake control device, and a detection circuit;

[0004] Wherein, an output end of the controller is connected to an input end of the first brake control circuit, an output end of the first brake control circuit is connected to the brake control device, an output end of the controller is connected to an input end of the second brake control circuit, an output end of the second brake control circuit is connected to the brake control device, the detection circuit is connected to the controller, the detection circuit is configured to detect the position of the pitch blade of the pitch motor and generate detection information to be sent to the controller, and the controller is configured to control the first brake control circuit to operate or control the second brake control circuit to operate according to the detection information.

[0005] In some embodiments, the first brake control circuit includes: a servo driver and a first relay;

[0006] Wherein, an input end of the servo driver is connected to an output end of the controller, an output end of the servo driver is connected to an input end of the first relay, and an output end of the first relay is connected to the brake control device.

[0007] In some embodiments, the output end of the servo driver is connected to the pitch motor, and the servo driver is configured to receive a control instruction from the controller and drive the pitch motor to operate.

[0008] In some embodiments, the output end of the detection circuit is connected to the input end of the servo driver, and is configured to send the detection information to the servo driver, so that the servo driver adjusts the operating state of the pitch motor.

[0009] In some embodiments, the second brake control circuit includes: a second relay;

[0010] Wherein, the input end of the second relay is connected to the output end of the controller, and the output end of the second relay is connected to the brake control device;

[0011] Wherein, when the servo driver sends a brake instruction to the brake control device and the detection information indicates that the position of the blade of the pitch motor has moved, the controller controls the second brake control circuit to operate, and controls the brake control device to apply the brake through the second brake control circuit;

[0012] Or, when the servo driver sends a brake release instruction to the brake control device, the servo driver drives the pitch motor to operate, and the detection information indicates that the position of the blade of the pitch motor has not moved, the controller controls the second brake control circuit to operate, and controls the brake control device to release the brake through the second brake control circuit.

[0013] In some embodiments, the detection circuit includes a position detection unit, and the position detection unit is connected to the controller.

[0014] In some embodiments, the controller is a PLC.

[0015] In some embodiments, the first relay and the second relay include: normally open contacts.

[0016] In some embodiments, the position detection unit is an absolute encoder.

[0017] An embodiment of the present application provides a wind turbine generator set, including the control circuit for the pitch motor brake described in any one of the above.

[0018] An embodiment of the present application provides a method for controlling a pitch motor brake, which is applied to the control circuit of the pitch motor described in any one of the above, and includes:

[0019] Obtain the position information of the blade of the pitch motor detected by the detection circuit;

[0020] Control the operation of the first brake control circuit or the second brake control circuit based on the position information.

[0021] A control circuit for a variable pitch motor brake, a wind turbine generator set, and a control method thereof provided by this application. Among them, the controller is respectively connected to the brake control device through the first brake control circuit and the second brake control circuit. The detection circuit detects the position of the blades of the variable pitch motor and sends the detection information to the controller. The controller controls the operation of the first brake control circuit or the second brake control circuit according to the detection information. Through the control circuit for the variable pitch motor brake provided by the embodiments of this application, the brake control device can be controlled by the second brake control circuit in the case of a failure of the first brake control circuit, improving the reliability of the wind turbine generator set. Description of the Drawings

[0022] In the following, this application will be described in more detail based on embodiments and with reference to the drawings.

[0023] Figure 1 It is a schematic structural diagram of a control circuit for a variable pitch motor brake provided by an embodiment of this application;

[0024] Figure 2 It is a schematic structural diagram of another control circuit for a variable pitch motor brake provided by an embodiment of this application;

[0025] Figure 3 It is a schematic implementation flow diagram of a control method for a variable pitch motor brake provided by an embodiment of this application;

[0026] Figure 4 It is a schematic structural diagram of a control circuit for a variable pitch motor brake provided by an embodiment of this application;

[0027] Figure 5 It is a schematic flow diagram of a control method applied to the control circuit for the variable pitch motor brake provided by an embodiment of this application.

[0028] In the drawings, the same components are denoted by the same reference numerals, and the drawings are not drawn to actual scale. Detailed Embodiments

[0029] In order to make the objectives, technical solutions, and advantages of this application clearer, the following will further describe this application in detail in conjunction with the drawings. The described embodiments should not be regarded as limitations of this application. All other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0030] In the following description, reference is made to "some embodiments", which describe a subset of all possible embodiments. However, it is understood that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict.

[0031] If similar descriptions such as "first / second / third" appear in the application documents, the following explanation shall be added. In the following description, the terms "first / second / third" are merely used to distinguish similar objects and do not represent a specific order for the objects. It is understood that "first / second / third" may, where permitted, interchange the specific order or sequence so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used herein are for the purpose of describing the embodiments of this application only and are not intended to limit this application.

[0033] The embodiments of this application provide a control circuit for a pitch motor brake. Figure 1 The following is a schematic structural diagram of a control circuit for a pitch motor brake provided by the embodiments of this application. As Figure 1 shown, it includes: a controller 101, a first brake control circuit 102, a second brake control circuit 103, a brake control device 104, and a detection circuit 105. Among them, the output end of the controller 101 is connected to the input end of the first brake control circuit 102, the output end of the first brake control circuit 102 is connected to the brake control device 104, the output end of the controller 101 is connected to the input end of the second brake control circuit 103, the output end of the second brake control circuit 103 is connected to the brake control device 104, the detection circuit 105 is connected to the controller 101, the detection circuit 105 is used to detect the position of the blade of the pitch motor and generate detection information to be sent to the controller 101, and the controller 101 is used to control the first brake control circuit 102 to operate or control the second brake control circuit 103 to operate according to the detection information.

[0034] In the embodiments of this application, the detection circuit detects the position of the blade of the pitch motor. When the blade moves, detection information indicating the movement of the blade is generated, and when the blade does not move, detection information indicating that the blade does not move is generated.

[0035] In the embodiment of the present application, when the detection circuit sends the detection information to the controller, the controller determines whether the first brake control circuit or the second brake control circuit is normal according to the control instruction sent by itself and the detection information. For example, when the master controller sends a brake instruction to the first brake control circuit and the first brake control circuit controls the brake control device, at this time, if the first brake control circuit is normal, the blades of the pitch motor should stop moving, and the detection information represents the position movement of the blades of the pitch motor. Then the controller determines that the first brake control circuit is abnormal. When the controller determines that the first brake control circuit is abnormal, the controller controls the second brake control circuit to work, and controls the brake control device to perform braking through the second brake control circuit. When the master controller sends a brake release instruction to the first brake control circuit and the first brake control circuit controls the brake control device, at this time, if the first brake control circuit is normal, the blades of the pitch motor should start to move, and the detection information represents that the position of the blades of the pitch motor remains unchanged. Then the controller determines that the first brake control circuit is abnormal. When the controller determines that the first brake control circuit is abnormal, the controller controls the second brake control circuit to work, and controls the brake control device to release the brake through the second brake control circuit.

[0036] In the embodiment of the present application, when the first brake control circuit works, the first brake control circuit is powered on, and when the second brake control circuit works, the second brake control circuit is powered on.

[0037] A control circuit for a pitch motor brake provided by the present application, the controller is respectively connected to the brake control device through the first brake control circuit and the second brake control circuit, the detection circuit detects the position of the blades of the pitch motor and sends the detection information to the controller, and the controller controls the first brake control circuit to work or the second brake control circuit to work according to the detection information. Through the control circuit for a pitch motor brake provided by the embodiment of the present application, it is possible to control the brake control device through the second brake control circuit in the case of a failure of the first brake control circuit, improving the reliability of the wind turbine generator set.

[0038] The embodiment of the present application further provides a control circuit for a pitch motor brake. Figure 2 As the structural schematic diagram of another control circuit for a pitch motor brake provided by the embodiment of the present application, as Figure 2As shown in the figure, the control circuit of the pitch motor brake includes: An embodiment of the present application provides a control circuit for a pitch motor brake, including: a controller 101, a servo driver 1021, a first relay 1022, a second brake control circuit 103, a brake control device 104, and a detection circuit 105; wherein, the input end of the servo driver 1021 is connected to the output end of the controller 101, the output end of the servo driver 1021 is connected to the input end of the first relay 1022, the output end of the first relay 1022 is connected to the brake control device 104, the output end of the controller 101 is connected to the input end of the second brake control circuit 103, the output end of the second brake control circuit 103 is connected to the brake control device 104, and the detection circuit 105 is connected to the controller 101.

[0039] In the embodiment of the present application, the controller can send control information to the servo driver, the servo driver controls the first relay to work, and at the same time the controller can send a control signal to the second brake control circuit. The controller is the main control system of the pitch motor, the servo driver is the main control component of the pitch motor, the system priority of the controller is higher than that of the system of the servo driver, the first relay is controlled by the servo driver, and the servo driver is controlled by the controller, while the second brake control circuit is directly controlled by the controller, thus forming two non - hierarchical brake circuits.

[0040] In some embodiments, the output end of the servo driver is connected to the pitch motor, and the servo driver is used to receive the control instruction of the controller and drive the pitch motor to work.

[0041] Continue to refer to Figure 2 , in some embodiments, the output end of the detection circuit is connected to the input end of the servo driver, and is used to send the detection information to the servo driver so that the servo driver adjusts the working state of the pitch motor.

[0042] In some embodiments, the second brake control circuit includes: a second relay;

[0043] Wherein, the input end of the second relay is connected to the output end of the controller, and the output end of the second relay is connected to the brake control device;

[0044] Wherein, when the servo driver sends a brake instruction to the brake control device and the detection information indicates that the position of the blade of the pitch motor has moved, the controller controls the second brake control circuit to work, and controls the brake control device to perform braking through the second brake control circuit;

[0045] Alternatively, when the servo driver sends a brake release instruction to the brake control device, the servo driver drives the pitch motor to operate, and when the detection information indicates that the position of the blade of the pitch motor has not moved, the controller controls the second brake control circuit to operate, and controls the brake control device to release the brake through the second brake control circuit.

[0046] In some embodiments, the detection circuit includes a position detection unit, and the position detection unit is connected to the controller.

[0047] In some embodiments, the controller is a PLC.

[0048] In some embodiments, the first relay and the second relay include normally open contacts.

[0049] In some embodiments, the position detection unit is an absolute encoder.

[0050] The embodiments of the present application provide a control method for a pitch motor brake. The embodiments of the application provide a control method for a pitch motor brake, and the method is applied to a controller. The functions realized by the control method for a pitch motor brake provided by the embodiments of the present application can be realized by a processor in a live broadcast server calling program code, wherein the program code can be stored in a computer storage medium. The embodiments of the present application provide a control method for a pitch motor brake. Figure 3 FIG. is a schematic flowchart of the implementation of a control method for a pitch motor brake provided by an embodiment of the present application, as Figure 3 shown, the method includes:

[0051] Step S301, obtaining position information of the blade of the pitch motor detected by a detection circuit;

[0052] Step S302, controlling the first brake control circuit to operate or controlling the second brake control circuit to operate based on the position information.

[0053] For the control method for a pitch motor brake provided by the present application, the detection circuit detects the position of the blade of the pitch motor and sends detection information to the controller, and the controller controls the first brake control circuit to operate or the second brake control circuit to operate according to the detection information. Through the control method for a pitch motor brake provided by the embodiments of the present application, it is possible to control the brake control device through the second brake control circuit in the case of a failure of the first brake control circuit, thereby improving the reliability of the wind turbine generator set.

[0054] The embodiments of the present application further provide a control circuit for a pitch motor brake. Figure 4 FIG. is a schematic structural diagram of a control circuit for a pitch motor brake provided by an embodiment of the present application, as Figure 4As shown in the figure, it includes: a servo driver, a main controller (the same as the controller in each of the above embodiments), a relay 1, a relay 2, a pitch motor, a position detection unit, and a motor brake device. Among them, the coil of relay 1 is powered by the servo driver, the coil of relay 2 is powered by the main controller, and the normally open contacts of relay 1 and relay 2 are connected in parallel to supply power to the motor brake device.

[0055] In the embodiment of the present application, the main controller can control the servo driver to control the coil of relay 1 to perform the braking operation; or the main controller can control relay 2 to perform the braking operation.

[0056] The braking circuit controlled by the servo driver for relay 1 and the braking circuit controlled by the main controller for relay 2 are two non-homologous braking circuits. The two form a redundant protection. The main controller is the main control system for pitch, and the servo driver is the main control component for the pitch motor. The system level of the main control system is higher than that of the servo driver, and they are non-equal braking circuits;

[0057] The braking circuit controlled by the main controller for relay 2 is the backup protection for the braking circuit controlled by the main controller to control the servo driver to control relay 1. When the braking circuit controlled by the main controller to control the servo driver to control relay 1 fails, the braking circuit controlled by the main controller to control relay 2 will act. That is, when the braking circuit controlled by the main controller to control the servo driver to control relay 1 is working normally, the braking operation is preferentially performed by controlling the coil of relay 1 through the servo driver; when the braking circuit controlled by the main controller to control relay 1 cannot work normally, the main controller controls relay 2 to perform the braking operation.

[0058] The position detection device, usually an absolute encoder, simultaneously feeds back the actual position information of the blade to the servo driver and the main controller in real time.

[0059] Figure 5 It is a schematic flowchart of the control method for the control circuit applied to the above-mentioned pitch motor brake in the embodiment of the present application, including:

[0060] Step S501, the main controller issues an instruction;

[0061] Step S502, the blade needs to reach the specified position;

[0062] Step S503, whether the servo driver successfully executes the brake release instruction;

[0063] In the embodiment of the present application, when the servo driver issues a brake command and the position detection device feedbacks that the position of the blade is still changing, or when the servo driver issues a brake release command and starts driving the motor to operate, and the position detection device feedbacks that the position of the blade has not changed, the brake command fails, and step S504 is executed; when the servo driver issues a brake command and the position detection device feedbacks that the position of the blade has not changed, that is, the brake command is successful, step S506 is executed.

[0064] Step S504: The main controller virtually releases the brake command.

[0065] Step S505: Relay 2 is powered on, and step S507 is continued to be executed.

[0066] Step S506: Relay 1 is powered on, and step S507 is continued to be executed.

[0067] Step S507: The motor brake is successfully released.

[0068] In the embodiment of the present application, the brake circuits controlled by the servo driver and the main controller are non - homologous brake circuits, and the two form redundant protection; the main controller is the main control system for pitch change, and the servo driver is the main control component for the pitch - changing motor. The system level of the main control system is higher than that of the servo driver, and they are not at the same level.

[0069] A control circuit for a pitch - changing motor brake and a wind turbine generator set provided by the embodiment of the present application are particularly suitable for a wind turbine with a single - loop pitch - changing motor brake. Such a unit cooperates with the motor brake to fix the blade position to achieve stable power output, and the unit will frequently perform pitch - in and pitch - out operations during power control, resulting in frequent operation of the motor brake. Frequent operation of the brake relay will accelerate the aging of the relay, shorten the service life, and increase the failure rate of the unit. Through this device, the problem of the failure of the pitch - changing motor brake circuit can be solved, the reliability of the unit can be improved, and the power generation can be increased. The present invention proposes a new design idea. In its overall design, the system composition is relatively simple, the technical effect is excellent, and it has relatively huge economic value and safety effectiveness that can be expected.

[0070] The embodiment of the present application provides a wind turbine generator set, including the control circuit for a pitch - changing motor brake described in any one of the above.

[0071] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, the "in one embodiment" or "in an embodiment" that appears throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics may be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the present application, the magnitude of the serial numbers of the above processes does not mean the sequence of execution, and the execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application. The serial numbers of the embodiments of the present application above are only for description and do not represent the advantages or disadvantages of the embodiments.

[0072] It should be noted that in this text, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the presence of another identical element in the process, method, article or device including the element.

[0073] In several embodiments provided by the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined, or can be integrated into another system, or some features can be ignored, or not executed. In addition, the coupling, direct coupling or communication connection between the components shown or discussed with each other can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0074] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units; they can be located in one place or distributed to multiple network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0075] In addition, each functional unit in the embodiments of the present application can be all integrated in one processing unit, or each unit can be separately used as a unit, or two or more units can be integrated in one unit; the above integrated units can be implemented in the form of hardware, or in the form of hardware plus software functional units.

[0076] Those of ordinary skill in the art will understand that all or part of the steps of implementing the above method embodiments can be completed by hardware related to program instructions. The foregoing program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps including those of the above method embodiments; and the foregoing storage medium includes: removable storage devices, read-only memories (ROMs), magnetic disks, or optical discs, and other various media that can store program codes.

[0077] Alternatively, if the above integrated units of the present application are implemented in the form of software function modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the embodiments of the present application, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a controller to execute all or part of the methods described in the various embodiments of the present application. And the foregoing storage medium includes: removable storage devices, ROMs, magnetic disks, or optical discs, and other various media that can store program codes.

[0078] The above is only the implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claimed rights.

Claims

1. A control circuit for a pitch motor brake, characterized in that, Including: A controller, a first brake control circuit, a second brake control circuit, a brake control device, and a detection circuit; Wherein, an output end of the controller is connected to an input end of the first brake control circuit, an output end of the first brake control circuit is connected to the brake control device, an output end of the controller is connected to an input end of the second brake control circuit, an output end of the second brake control circuit is connected to the brake control device, the detection circuit is connected to the controller, the detection circuit is configured to detect a position of a blade of a pitch motor and generate detection information to be sent to the controller, and the controller is configured to control the first brake control circuit to operate or control the second brake control circuit to operate according to the detection information; Wherein, the first brake control circuit includes: a servo driver and a first relay; an input end of the servo driver is connected to an output end of the controller, an output end of the servo driver is connected to an input end of the first relay, and an output end of the first relay is connected to the brake control device; the output end of the servo driver is connected to the pitch motor, and the servo driver is configured to receive a control instruction from the controller and drive the pitch motor to operate; The second brake control circuit includes: a second relay; an input end of the second relay is connected to an output end of the controller, and an output end of the second relay is connected to the brake control device; Wherein, a priority of the controller's system is higher than a priority of the servo driver's system, and the servo driver is controlled by the controller; the detection circuit includes a position detection unit, and the position detection unit is connected to the controller; the position detection unit is an absolute encoder.

2. The control circuit of the pitch motor brake according to claim 1, characterized in that An output end of the detection circuit is connected to an input end of the servo driver, and the detection circuit is configured to send the detection information to the servo driver so that the servo driver adjusts an operating state of the pitch motor.

3. The control circuit for a pitch motor brake according to claim 1, wherein Among them, When the servo driver sends a brake instruction to the brake control device and the detection information indicates that the position of the blade of the pitch motor has moved, the controller controls the second brake control circuit to operate, and controls the brake control device to perform braking through the second brake control circuit; Or, when the servo driver sends a brake release instruction to the brake control device, the servo driver drives the pitch motor to operate, and the detection information indicates that the position of the blade of the pitch motor has not moved, the controller controls the second brake control circuit to operate, and controls the brake control device to release the brake through the second brake control circuit.

4. The control circuit of the pitch motor brake according to claim 1, characterized in that The first relay and the second relay include: normally open contacts.

5. A wind power generating set, characterized in that, Including the control circuit for a pitch motor brake according to any one of claims 1 to 4.

6. A control method for a pitch motor brake, characterized in that Applied to the control circuit for a pitch motor brake according to any one of claims 1 to 4, including: Obtaining position information of a blade of a pitch motor detected by a detection circuit; Control the operation of the first brake control circuit or the second brake control circuit based on the position information.

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