Yaw braking system, yaw system and wind generating set

Abstract

The utility model relates to a yaw braking system, a yaw system and a wind generating set, the yaw braking system comprises a brake disc, a main brake and an auxiliary braking assembly, the main brake is in friction contact with the brake disc to brake the brake disc, the auxiliary braking assembly comprises a support and an auxiliary brake arranged on the support, the support is detachably connected to the main brake, and the auxiliary brake is arranged on the support. And the auxiliary brake is in frictional contact with the brake disc. According to the yaw braking system, the number of the brakes can be increased to provide additional yaw braking torque, so that the braking requirement of the wind generating set is met, and the working stability of the yaw system of the wind generating set is improved.

Description

Technical Field

[0001] The present application relates to the field of wind power technology, and in particular to a yaw brake system, a yaw system and a wind turbine generator set. Background Art

[0002] In the wind power industry, the impeller and the nacelle receive wind direction information from the wind vane through the yaw system. The actuator drives the yaw bearing and drives the impeller and the nacelle to actively yaw to the wind to cope with the change of wind direction at any time, so that the wind energy absorbed by the impeller tends to be optimal. Due to the changeable wind direction, the wind turbine is designed with a yaw system to make the impeller tend to align with the changing wind direction at any time.

[0003] Among them, in the yaw system, the yaw brake system is used to provide braking torque to prevent the wind turbine from uncontrolled yaw when the wind speed is too high. However, in actual use, the number of brakes in the yaw brake system may be insufficient, resulting in insufficient braking torque of the unit, causing impact damage to the yaw system of the wind turbine and other consequences. Utility Model Content

[0004] The present application provides a yaw brake system, a yaw system and a wind turbine generator set, which can increase the number of brakes to provide additional yaw braking torque and improve the working stability of the yaw system of the wind turbine generator set.

[0005] On the one hand, according to an embodiment of the present application, a yaw brake system is proposed, including: a brake disc; a main brake, which is in frictional contact with the brake disc and brakes the brake disc; an auxiliary brake assembly, including a bracket and an auxiliary brake arranged on the bracket, wherein the bracket is detachably connected to the main brake and is in frictional contact with the brake disc through the auxiliary brake.

[0006] According to one aspect of an embodiment of the present application, the brake disc is annular, the number of main brakes is more than two and they are arranged at intervals along the circumference of the brake disc; the bracket is connected to at least one of the main brakes, and the auxiliary brake is arranged between two adjacent main brakes.

[0007] According to one aspect of an embodiment of the present application, the shape of the bracket is adapted to the shape of the brake disc, and the bracket is configured as an annular structure, or the bracket includes multiple support segments, each of which is connected to a portion of the main brakes.

[0008] According to one aspect of the embodiment of the present application, both ends of the support segment along the circumferential direction are connected to the main brake.

[0009] According to one aspect of the embodiment of the present application, the auxiliary brake is detachably connected to the bracket.

[0010] According to one aspect of the embodiment of the present application, a plurality of groups of connection parts are provided on the bracket at intervals along the circumference of the brake disc, and the bracket is detachably connected to the main brake through some of the connection parts, and is detachably connected to the auxiliary brake through some of the connection parts.

[0011] According to one aspect of the embodiment of the present application, the main brake and the auxiliary brake have the same structure.

[0012] On the other hand, according to an embodiment of the present application, a yaw system is proposed, which is used to be arranged between the tower and the frame of a wind turbine generator set, and the yaw system includes: a yaw bearing, including an inner ring and an outer ring that are rotatably matched, one of the inner ring and the outer ring is connected to the tower, and the other is connected to the frame; a driving device, which is connected to the yaw bearing and drives the inner ring to rotate relative to the outer ring; a yaw brake system like the above embodiment, in which the brake disc is connected to the tower, and the main brake is connected to the frame and is in friction contact with the brake disc.

[0013] According to one aspect of an embodiment of the present application, an opening for connecting to a frame is provided on the main brake along the axial direction of the yaw bearing, and a bracket is provided on one side of the main brake along the axial direction; the auxiliary brake assembly also includes a connecting piece, which passes through the bracket and connects the main brake to the frame through the opening.

[0014] On the other hand, according to an embodiment of the present application, a wind turbine generator set is provided, including a tower, a frame, and a yaw system arranged between the tower and the frame, and the yaw system is the yaw system of the above embodiment.

[0015] The yaw system provided in the embodiment of the present application includes a brake disc, a main brake and an auxiliary brake assembly, wherein the brake disc is used to be installed on the tower, the main brake is used to be installed on the reserved interface of the frame, and the auxiliary brake assembly includes a bracket and an auxiliary brake. When a new brake is needed, the new brake can be set on the bracket as an auxiliary brake, and the bracket can be detachably connected to the main brake to achieve the installation of the auxiliary brake, and then the main brake and the auxiliary brake can be frictionally contacted with the brake disc together to provide additional yaw braking torque to meet the braking requirements of the wind turbine generator set and improve the working stability of the yaw system of the wind turbine generator set. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0017] Figure 1 is a structural schematic diagram of a wind turbine generator set according to an embodiment of the present application;

[0018] Figure 2 yes Figure 1 Partial cross-sectional view at DD in the middle;

[0019] Figure 3is a cross-sectional schematic diagram of a wind turbine generator set at a main brake according to an embodiment of the present application;

[0020] Figure 4 is a structural schematic diagram of a yaw brake system according to an embodiment of the present application;

[0021] Figure 5 is a schematic structural diagram of a yaw brake system according to an embodiment of the present application when an auxiliary brake assembly is not installed;

[0022] Figure 6 is a structural schematic diagram of an auxiliary brake assembly according to an embodiment of the present application;

[0023] Figure 7 It is a structural schematic diagram of a yaw brake system of an embodiment of the present application when an auxiliary brake assembly is installed.

[0024] In the attached figure:

[0025] 100-tower; 110-tower flange; 200-frame; 210-unit base; 300-impeller; 400-yaw system;

[0026] 10-yaw brake system; 20-yaw bearing; 30-drive device;

[0027] 1-brake disc; 2-main brake; 21-opening; 22-original connecting bolt; 3-auxiliary brake assembly; 31-bracket; 311-connecting part; 32-auxiliary brake; 33-connecting piece; 4-inner ring; 5-outer ring;

[0028] Z-axis direction.

[0029] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0030] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least some of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0031] The directional words appearing in the following description are all directions shown in the figures, and do not limit the yaw brake system, yaw system and wind turbine generator set of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0032] In order to better understand this application, Figures 1 to 7 The yaw brake system, yaw system and wind turbine generator set of the embodiments of the present application are described in detail.

[0033] See also Figure 1 , Figure 1 The structure diagram of a wind turbine generator set according to an embodiment of the present application is shown. The embodiment of the present application provides a wind turbine generator set, which includes a tower 100, a frame 200 and an impeller 300. The frame 200 is arranged at the top of the tower 100. Due to the changeable wind direction, such as Figure 2 and Figure 3 A yaw system 400 is provided between the tower 100 and the frame 200. The yaw system 400 drives the frame 200 to rotate relative to the tower 100 to realize the yaw action of the impeller 300, so that it is always in a windward state, which can make full use of wind energy and improve the power generation efficiency of the wind turbine generator set.

[0034] See also Figure 2 and Figure 3 The embodiment of the present application further provides a yaw system 400, including a yaw bearing 20 and a driving device 30. The yaw bearing 20 includes an inner ring 4 and an outer ring 5 that are rotatably matched. One of the inner ring 4 and the outer ring 5 is connected to the tower 100, and the other is connected to the frame 200. The driving device 30 is connected to the yaw bearing 20 and drives the inner ring 4 to rotate relative to the outer ring 5, thereby driving the impeller 300 and the frame 200 to actively yaw against the wind to cope with changes in wind direction at any time, so that the wind energy absorbed by the impeller 300 tends to be optimal.

[0035] Taking a specific embodiment of the present application as an example, when the yaw system 400 is used in a wind turbine generator set, a tower flange 110 is provided on the top of the tower 100, a unit base 210 is provided at the bottom of the frame 200, the inner ring 4 of the yaw bearing 20 is connected to the unit base 210, and the outer ring 5 of the yaw bearing 20 is connected to the tower flange 110.

[0036] The driving device 30 can be configured as a driving motor. The driving device 30 is indirectly fixedly connected to the inner ring 4 of the yaw bearing 20 through the unit base 210 of the wind turbine generator set. The output end of the driving device 30 is meshed with the outer ring 5 of the yaw bearing 20 through a transmission device such as a gearbox, so that the driving device 30 can rotate relative to the outer ring 5, thereby driving the inner ring 4 to rotate relative to the outer ring 5. The number of the driving devices 30 can be 1, or more than 2, for example, 3, 5 or more. For example, when the driving devices 30 are configured as 3, the 3 driving devices 30 can be spaced apart in the circumferential direction of the yaw bearing 20, so that the driving device 30 can stably drive the inner ring 4 of the yaw bearing 20 to rotate relative to the outer ring 5, so as to achieve the yaw of the impeller 300.

[0037] In a wind turbine generator set, since the frame 200 and the impeller 300 have a large moment of inertia, the yaw system 400 needs to comprehensively consider the damping during yaw when designing. At the same time, the unit needs to be stable in a certain direction. The yaw system 400 also includes a yaw brake system 10. When the impeller 300 is aligned with the wind direction, the yaw brake system 10 of the yaw system 400 can provide the necessary braking torque to lock the position of the impeller 300 to prevent the wind turbine generator set from uncontrolled yaw when the wind speed is too high. At the same time, a certain yaw damping torque is provided when the cable is untied, so that the wind turbine generator set can run smoothly when the cable is untied.

[0038] The yaw braking system 10 in the prior art includes a brake disc 1 and a brake. The brake disc 1 is connected to the tower 100. The brake is installed on a reserved interface of the frame 200 and is in frictional contact with the brake disc 1 to convert the friction force into a braking force, thereby generating a braking torque between the frame 200 and the tower 100 to achieve yaw braking of the wind turbine.

[0039] However, since the number of reserved interfaces of the frame 200 is fixed after the wind turbine generator set is designed, even if there is a problem of insufficient braking torque of the yaw brake system 10 during actual use and more brakes need to be added, the installation of the newly added brakes cannot be achieved. Therefore, in order to overcome the above defects, the embodiment of the present application also provides a new yaw brake system 10, which can be used for the yaw system 400 and the wind turbine generator set of the above embodiments, and as a component of the yaw system 400 and the wind turbine generator set, of course, it can also be produced or sold separately as an independent component.

[0040] Please also read Figure 3 and Figure 4 , Figure 4A partial enlarged view of a yaw brake system 10 according to an embodiment of the present application is shown. The present application provides a yaw brake system 10, comprising a brake disc 1, a main brake 2 and an auxiliary brake assembly 3, wherein the main brake 2 is in frictional contact with the brake disc 1 and brakes the brake disc 1, and the auxiliary brake assembly 3 comprises a bracket 31 and an auxiliary brake 32 disposed on the bracket 31, wherein the bracket 31 is detachably connected to the main brake 2 and is in frictional contact with the brake disc 1 through the auxiliary brake 32.

[0041] In the yaw brake system 10 in the embodiment of the present application, the main brake 2 is used to be installed on the reserved interface of the frame 200. When a new brake is needed, the new brake can be set on the bracket 31 as an auxiliary brake 32, and the bracket 31 is detachably connected to the main brake 2 to achieve the installation of the auxiliary brake 32. Then, the main brake 2 and the auxiliary brake 32 can be in frictional contact with the brake disc 1 to provide additional yaw braking torque, so as to meet the braking requirements of the wind turbine and improve the working stability of the yaw system 400 of the wind turbine.

[0042] It can be understood that by providing the bracket 31, the main brake 2 and the auxiliary brake 32 can be combined into a whole, the main brake 2 is directly connected to the frame 200, and the auxiliary brake 32 is indirectly connected to the frame 200 through the bracket 31 and the main brake 2. The main brake 2 and the auxiliary brake 32 are in frictional contact with the brake disc 1, so as to jointly increase the braking torque between the frame 200 and the tower 100.

[0043] Optionally, each brake can generally generate a braking force of 200KN to 500KN according to different models and sizes. The model and number of the main brake 2 can be determined according to the design requirements of the wind turbine generator set when designing the wind turbine generator set. Among them, the number of main brakes 2 can be more than 2, for example, 10 main brakes 2 are set. When the size of the main brake 2 is set reasonably and the braking effect is good enough, the number of the main brake 2 can be 1, which can be set specifically according to the use requirements.

[0044] Optionally, the model and number of the auxiliary brake 32 can be determined according to the braking force required to be increased when the wind turbine generator set is actually used according to the actual working conditions of the wind turbine generator set. The number of the auxiliary brake 32 can be 1 or more than 2, which can be set according to the specific use requirements.

[0045] In some optional embodiments, the brake disc 1 is annular, the number of the main brakes 2 is more than two and they are arranged at intervals along the circumference of the brake disc 1, the bracket 31 is connected to at least one of the main brakes 2, and the auxiliary brake 32 is arranged between two adjacent main brakes 2.

[0046] By arranging the main brakes 2 at intervals along the circumference of the brake disc 1 and arranging the auxiliary brake 32 between two adjacent main brakes 2, the circumferential space of the brake disc 1 can be more reasonably utilized, and the arrangement of the bracket 31 and the auxiliary brake 32 is more convenient.

[0047] As an optional embodiment, when the number of auxiliary brakes 32 is more than two, according to the distance between two adjacent main brakes 2, at least two auxiliary brakes 32 can be arranged between two adjacent main brakes 2, or, one auxiliary brake 32 can be arranged between two adjacent main brakes 2, that is, the auxiliary brakes 32 and at least part of the main brakes 2 are alternately arranged, so as to achieve uniform arrangement of the main brakes 2 and the auxiliary brakes 32, facilitate force transmission between the main brakes 2 and the auxiliary brake assembly 3, and improve the reliability of the yaw brake system 10.

[0048] In some optional embodiments, the shape of the bracket 31 is adapted to the shape of the brake disc 1 , and the bracket 31 is configured as an annular structure, or the bracket 31 includes a plurality of support segments, each of which is connected to a portion of the main brakes 2 .

[0049] Among them, since the brake disc 1 extends in a ring shape along the circumference of the tower 100, the shape of the bracket 31 is adapted to the shape of the brake disc 1, which means that when the tower 100 is cylindrical or conical, the brake disc 1 can be set as a ring, so the bracket 31 can be set as a ring structure, or the support section is set as an arc. When the tower 100 is a square tube or other polygonal tube, the brake disc 1 can also be set as a square ring or other polygonal ring, so the bracket 31 can also be set as a square ring structure, etc., or the support section is set as a plurality of straight sections, to achieve the connection between the main brake 2 and the auxiliary brake 32.

[0050] When the bracket 31 is configured as an integrally arranged annular structure, the bracket 31 can be connected to at least one main brake 2, or simultaneously connected to more than two main brakes 2. Optionally, the bracket 31 is connected to each main brake 2 along the circumferential direction to further improve the reliability of the connection between the auxiliary brake 32 and the main brake 2, and improve the working stability of the yaw system 400.

[0051] When the bracket 31 is configured as a plurality of support segments, each support segment may be connected to one main brake 2, or may be connected to more than two main brakes 2. By configuring the bracket 31 as a plurality of support segments, it is easier to prepare, and the manufacturing precision of the bracket 31 can be reduced, and the connection between the bracket 31 and the main brake 2 can be more convenient, thereby reducing the manufacturing cost of the yaw brake system 10. Moreover, the influence of the deformation of the bracket 31 on the braking effect of the yaw brake system 10 after long-term use can be reduced, thereby increasing the service life of the yaw brake system 10.

[0052] Specifically, the number of support segments and the extension length of each support segment can be adjusted according to actual needs as long as the connection requirements of the main brake 2 and the auxiliary brake 32 are met.

[0053] See also Figure 3 and Figure 4 When the bracket 31 includes a plurality of support segments, in some optional embodiments, both ends of the support segments along the circumferential direction are connected to the main brake 2. By connecting both ends of the support segments along the circumferential direction to the main brake 2, it is easier to transmit force between the main brake 2 and the auxiliary brake assembly 3, thereby improving the reliability of the yaw brake system 10.

[0054] In some optional embodiments, the auxiliary brake 32 is detachably connected to the bracket 31 .

[0055] By detachably connecting the auxiliary brake 32 to the bracket 31 , the number, type or position of the auxiliary brake 32 on the bracket 31 can be adjusted accordingly according to the braking torque required to be increased by the yaw brake system 10 , thereby improving applicability.

[0056] In some optional embodiments, the bracket 31 is provided with a plurality of groups of connection parts 311 at intervals along the circumference of the brake disc 1, and the bracket 31 is detachably connected to the main brake 2 through some of the connection parts 311, and is detachably connected to the auxiliary brake 32 through some of the connection parts 311. For example, the connection parts 311 can be configured as bolts or buckles, etc. In actual use, the auxiliary brake assembly 3 can connect the auxiliary brake 32 and the main brake 2 to different connection parts 311 of the bracket 31 according to actual needs, thereby simplifying the structure of the bracket 31 and improving the applicability of the yaw brake system 10.

[0057] As an optional embodiment, the main brake 2 and the auxiliary brake 32 have the same structure.

[0058] By making the structures of the main brake 2 and the auxiliary brake 32 identical, the structure of the yaw brake system 10 can be simplified, making it easier to design and install the yaw brake system 10 and reducing costs.

[0059] See also Figure 3 and Figure 4 Optionally, the brake disc 1 includes a first braking surface and a second braking surface relatively arranged along its own axial direction Z, and the main brake 2 and the auxiliary brake 32 both include an upper brake body and a lower brake body relatively arranged and interconnected, the upper brake body can frictionally contact the first braking surface, and the lower brake body can frictionally contact the second braking surface to brake the brake disc 1.

[0060] As an optional embodiment, the upper gate body includes an upper mounting member and an upper friction plate telescopically connected to the upper mounting member, and the upper gate body is in friction contact with the first braking surface through the upper friction plate. The lower gate body includes a lower mounting member and a lower friction plate telescopically connected to the lower mounting member, and the lower gate body is in friction contact with the second braking surface through the lower friction plate.

[0061] Specifically, in this embodiment, a first driving component is provided on the upper mounting member, and the first driving component is connected between the upper friction plate and the upper mounting member, that is, the upper friction plate is retractably connected to the upper mounting member through the first driving component, and the upper friction plate is driven to retract relative to the upper mounting member by the first driving component, and then the friction contact or separation with the first braking surface of the brake disc 1 is achieved. A second driving component is provided on the lower mounting member, and the second driving component is connected between the lower friction plate and the lower mounting member, that is, the lower friction plate is retractably connected to the lower mounting member through the second driving component, and the lower friction plate is driven to retract relative to the lower mounting member by the second driving component, and then the friction contact or separation with the second braking surface of the brake disc 1 is achieved. The first driving component can be a hydraulic driving component, such as a hydraulic cylinder, or a pneumatic driving component, such as a cylinder, etc., as long as the upper friction plate can be retractably connected to the upper mounting member, and the lower friction plate can be retractably connected to the lower mounting member, and then the friction contact with the first braking surface and the second braking surface of the corresponding brake disc 1 can be achieved to brake the brake disc 1.

[0062] The friction coefficient of the friction plate is generally about 0.4, which means that a 1N hydraulic cylinder thrust can generate a 0.4N braking force, so as to achieve braking of the brake disc 1 by converting the thrust into friction force. By adopting the above structure for the main brake 2 and the auxiliary brake 32, it is easy to process and low in cost while ensuring the braking requirements.

[0063] See also Figure 3 and Figure 4 In some optional embodiments, an opening 21 for connecting with the frame 200 is provided on the main brake 2 along the axial direction Z of the yaw bearing 20, and a bracket 31 is arranged on one side of the main brake 2 along the axial direction Z. The auxiliary brake assembly 3 also includes a connecting member 33, which passes through the bracket 31 and connects the main brake 2 to the frame 200 through the opening 21.

[0064] It can be understood that since the main brake 2 itself is provided with an opening 21 for connecting to the frame 200, by arranging the bracket 31 on the side of the opening 21 of the main brake 2, the opening 21 of the main brake 2 can be reused without changing the structure of the original yaw brake system 10, that is, the installation of the auxiliary brake 32 can be achieved, and then while ensuring the working stability of the yaw system 400, the structure of the auxiliary brake assembly 3 can be further simplified to reduce costs.

[0065] Optionally, the connecting member 33 can be set as a connecting bolt, the opening 21 can be set as a threaded hole, the connecting portion 311 on the bracket 31 can be set as a flange hole, the flange hole can be set as a smooth hole, and the flange hole matches the opening 21, so as to make it easier to detachably connect the bracket 31 to the main brake 2.

[0066] As an optional embodiment, the yaw brake system 10 in the embodiment of the present application includes four main brakes 2 and three auxiliary brakes 32. Seven groups of flange holes may be provided on the bracket 31 at intervals along the circumferential direction, wherein the first group of flange holes, the third group of flange holes, the fifth group of flange holes and the seventh group of flange holes are used for detachable connection with the main brakes 2, and the second group of flange holes, the fourth group of flange holes and the sixth group of flange holes are used for detachable connection with the auxiliary brakes 32, thereby adding the auxiliary brakes 32 to the yaw brake system 10 to meet the braking requirements of the yaw system 400.

[0067] It can be understood that the yaw brake system 10 may also include three main brakes 2 and two auxiliary brakes 32, and the bracket 31 may also be provided with five groups of flange holes at intervals, or the bracket 31 may also be provided with more groups of flange holes, and the number and arrangement positions of the flange holes, the main brakes 2 and the auxiliary brakes 32 on the bracket 31 can be adjusted according to actual needs.

[0068] Please also Figures 5 to 7 , the following takes a yaw brake system 10 in a specific embodiment as an example to illustrate the steps of adding an auxiliary brake 32 to the original yaw brake system 10 .

[0069] First, the auxiliary brake 32 can be installed on the bracket 31. Secondly, before installing the bracket 31, it is necessary to remove the original connecting bolts 22 on the main brake 2 connected to the frame 200, and then set the bracket 31 on one side of the main brake 2, align the flange hole on the bracket 31 with the opening 21 of the main brake 2, replace the original connecting bolts 22 with the connecting member 33, and connect the bracket 31 to the main brake 2 by sequentially penetrating the connecting hole and the opening 21 of the connecting member 33, so as to increase the number of brakes on the basis of the original yaw brake system 10 to meet the braking requirements of the yaw brake system 10 and improve the working stability of the yaw system 400.

[0070] It can be understood that the length of the connecting member 33 along the axial direction Z is greater than or equal to the sum of the length of the original connecting bolt 22 along the axial direction Z and the thickness of the bracket 31 along the axial direction Z. For example, when the length of the original connecting bolt 22 along the axial direction Z is 250 mm and the thickness of the bracket 31 along the axial direction Z is 50 mm, the length of the connecting member 33 along the axial direction Z can be set to 300 mm to facilitate connecting the bracket 31 to the main brake 2.

[0071] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A yaw braking system, characterized in that: include: Brake disc (1); A main brake (2) is in frictional contact with the brake disc (1) and brakes the brake disc (1); The auxiliary brake assembly (3) comprises a bracket (31) and an auxiliary brake (32) arranged on the bracket (31); the bracket (31) is detachably connected to the main brake (2) and is in frictional contact with the brake disc (1) through the auxiliary brake (32).

2. The yaw braking system according to claim 1, characterized in that: The brake disc (1) is annular, and the number of the main brakes (2) is more than two and they are arranged at intervals along the circumference of the brake disc (1); The bracket (31) is connected to at least one of the main brakes (2), and the auxiliary brake (32) is arranged between two adjacent main brakes (2).

3. The yaw braking system according to claim 2, characterized in that: The shape of the bracket (31) is adapted to the shape of the brake disc (1), and the bracket (31) is configured as an annular structure, or the bracket (31) comprises a plurality of support segments, each of which is connected to a portion of the main brakes (2).

4. The yaw braking system according to claim 3, characterized in that: Both ends of the support section along the circumferential direction are connected to the main brake (2).

5. The yaw brake system according to any one of claims 2 to 4, characterized in that: The auxiliary brake (32) is detachably connected to the bracket (31).

6. The yaw braking system according to claim 5, characterized in that: The bracket (31) is provided with a plurality of groups of connection parts (311) at intervals along the circumference of the brake disc (1); the bracket (31) is detachably connected to the main brake (2) through part of the connection parts (311), and is detachably connected to the auxiliary brake (32) through part of the connection parts (311).

7. The yaw braking system according to claim 1, characterized in that: The main brake (2) and the auxiliary brake (32) have the same structure.

8. A yaw system, used to be arranged between a tower (100) and a frame (200) of a wind turbine generator set, characterized in that: The yaw system (400) comprises: A yaw bearing (20) comprises an inner ring (4) and an outer ring (5) which are rotatably matched, wherein one of the inner ring (4) and the outer ring (5) is connected to the tower (100), and the other is connected to the frame (200); A driving device (30) connected to the yaw bearing (20) and driving the inner ring (4) to rotate relative to the outer ring (5); According to any one of claims 1 to 7, the brake disc (1) is connected to the tower (100), and the main brake (2) is connected to the frame (200) and is in frictional contact with the brake disc (1).

9. The yaw system according to claim 8, characterized in that: An opening (21) for connecting with the frame (200) is provided on the main brake (2) along the axial direction (Z) of the yaw bearing (20), and the bracket (31) is provided on one side of the main brake (2) along the axial direction (Z); The auxiliary brake assembly (3) further comprises a connecting member (33), wherein the connecting member (33) passes through the bracket (31) and connects the main brake (2) to the frame (200) through the opening (21).

10. A wind turbine generator set, characterized in that: The invention comprises a tower (100), a frame (200), and a yaw system (400) arranged between the tower (100) and the frame (200), wherein the yaw system (400) is the yaw system (400) according to claim 8 or 9.

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