Collecting ring of doubly-fed wind turbine generator

Abstract

When the doubly-fed wind turbine generator collecting ring is used, stator phase current with a large current value in a wind turbine generator sequentially flows through a path with a large current-carrying capacity, and the situations that the current-carrying capacity is too large, the temperature is too high, and parts are burnt out are avoided; rotor phase current with a small current value sequentially flows through a path with a small current-carrying capacity, so that components on the rotor phase current path meet the current-carrying requirement, the conditions of current-carrying vacancy and material waste are avoided, and the manufacturing cost of the collector ring is reduced; besides, two groups of cables of the doubly-fed wind turbine generator can be accessed from the wire inlet mechanism, and the two current paths of the current collection mechanism which is highly integrated and compact in structure are used for carrying out moderately high shunting, so that the two current paths are reasonably distributed and radiated, and the service life of the double-fed wind turbine generator is prolonged. And finally, the wires are safely and stably led out from the first wire outlet mechanism and the second wire outlet mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a collector ring of a doubly-fed wind turbine generator set. Background Art

[0002] The collector ring is a key component in a wind turbine, mainly used to support the normal operation of the yaw system of the wind turbine; the yaw system is responsible for adjusting the direction of the wind turbine blades so that they always face the direction of the wind to maximize the power generation efficiency. The setting of the collector ring can avoid cable entanglement when the yaw system adjusts the direction of the wind turbine blades.

[0003] The electricity generated by a doubly-fed wind turbine generator set includes two parts: the stator phase current and the rotor phase current, in which the stator phase current is greater than the rotor phase current. When conventional slip rings are applied to doubly-fed wind turbine generator sets, the two groups of currents are not distinguished, resulting in excessive current carrying capacity of the conductive components on the stator phase current path, resulting in excessive temperature and burning of components, while the conductive components on the rotor phase current path have idle current carrying capacity and waste of materials. Therefore, it is difficult to reasonably derive the two different groups of currents. In addition, since the two currents of the doubly-fed wind turbine generator set must be derived through the same slip ring, how to make the entire slip ring compact in structure, low in cost, and safe and stable in deriving the two currents is a difficult problem that technicians are committed to solving. Summary of the invention

[0004] The problem to be solved by the present invention is to provide a double-fed wind turbine set collector ring which has high current carrying capacity matching when deriving stator phase current and rotor phase current and can safely and stably derive two currents under the premise of compact structure and low cost.

[0005] The technical solution adopted by the present invention to solve the above problem is: a collector ring of a doubly-fed wind turbine generator system, comprising a collector mechanism, a first outlet mechanism and a second outlet mechanism respectively arranged on both sides of the collector mechanism, and an inlet mechanism arranged above the collector mechanism; The inlet mechanism includes a stator phase connection terminal and a rotor phase connection terminal; the collector mechanism includes a rotor structure and a stator structure; the rotor structure includes a stator phase busbar, a rotor phase busbar, a stator phase slip ring and a rotor phase slip ring; the stator structure includes a stator phase carbon brush, a stator phase connection bar, a rotor phase carbon brush and a rotor phase connection bar; the first outlet mechanism includes a first stator phase busbar; the second outlet mechanism includes a second stator phase busbar and a rotor phase busbar; The stator phase current of the wind turbine set flows through the stator phase connection terminal, the stator phase busbar, the stator phase slip ring, the stator phase carbon brush and the stator phase connection bar in sequence, and is shunted from the stator phase connection bar to the first stator phase busbar and the second stator phase busbar; the rotor phase current of the wind turbine set flows through the rotor phase connection terminal, the rotor phase busbar, the rotor phase slip ring, the rotor phase carbon brush, the rotor phase connection bar and the rotor phase busbar in sequence; the current carrying capacity of the components on the stator phase current path of the wind turbine set is greater than the current carrying capacity of the components on the rotor phase current path of the wind turbine set.

[0006] Compared with the prior art, when the cable of the doubly-fed wind turbine generator set is connected to the present invention, the stator phase current with a larger current value flows through the stator phase connection terminal with a larger current carrying capacity, the stator phase busbar, the stator phase slip ring, the stator phase carbon brush and the stator phase connection row in sequence, and is divided at the stator phase connection row, and flows to the first stator phase busbar of the first outlet mechanism on one side and the second stator phase busbar of the second outlet mechanism respectively, thereby reducing the current intensity on a single path and making the heat dissipation area of ​​the components on the stator phase current path large, thereby avoiding the situation of excessive current carrying capacity, excessive temperature and burning of components; the rotor phase current with a smaller current value flows through the current carrying terminal in sequence, and the stator phase busbar is connected to the stator phase busbar. The rotor phase connection terminals, rotor phase busbars, rotor phase slip rings, rotor phase carbon brushes, rotor phase connection bars and rotor phase busbars are relatively small, so that the components on the rotor phase current path can meet the current-carrying requirements and avoid the situation of idle current-carrying and waste of materials, thereby reducing the manufacturing cost of the collector ring; in addition, since the two groups of cables of the doubly fed wind turbine can be connected from the incoming line mechanism, the two currents are highly matched and shunted through the above two current paths of the highly integrated and compact collector mechanism, so that the two currents are reasonably distributed and dissipated, and finally are safely and stably led out from the first outgoing line mechanism and the second outgoing line mechanism respectively.

[0007] A double-fed wind turbine set collector ring of the present invention, wherein the stator phase current of the wind turbine set is set to three phases U, V, and W, and the components on the stator phase current path are set to corresponding three groups U, V, and W; the rotor phase current of the wind turbine set is set to three phases K, L, and M, and the components on the rotor phase current path are set to corresponding three groups K, L, and M.

[0008] A double-fed wind turbine set collector ring of the present invention, wherein the stator phase busbar is composed of a plurality of rotor phase busbars with the same cross-sectional specifications; The stator phase slip ring is composed of a plurality of rotor phase slip rings with the same cross-sectional specifications; The cross-sectional area of ​​the stator phase connection row is larger than that of the rotor phase connection row; The stator phase carbon brush is composed of the rotor phase carbon brush with the same specifications; The cross-sectional areas of the first stator phase busbar and the second stator phase busbar are both larger than that of the rotor phase busbar.

[0009] A collector ring of a doubly-fed wind turbine of the present invention, wherein the stator phase connection terminal comprises a U-shaped row and a T-shaped row; the U-shaped row comprises a conductive bottom plate and two conductive side plates respectively arranged on both sides of the conductive bottom plate; the T-shaped row comprises a conductive connection plate and a conductive extension plate; the conductive connection plate cooperates with the conductive bottom plate; the two conductive side plates and the conductive extension plate are used to connect the cables of the stator phase of the wind turbine; the conductive bottom plate is used to connect a plurality of stator phase busbars; The rotor phase connection terminal has a first connection surface and a plurality of second connection surfaces; the first connection surface is used to connect the rotor phase busbar; the plurality of second connection surfaces are used to connect the cables of the rotor phase of the wind turbine.

[0010] A collector ring of a doubly-fed wind turbine set according to the present invention, wherein the rotor phase slip ring comprises a plurality of busbar mounting portions and a plurality of positioning portions arranged on the inner wall, and a plurality of grooves arranged on the outer wall along the circumferential direction; a wear debris collection box is provided at the bottom of the stator phase slip ring and the rotor phase slip ring.

[0011] A double-fed wind turbine collector ring of the present invention, wherein the stator phase connection bar comprises a plurality of stator phase arc-shaped bars, a first stator phase transfer bar, a second stator phase transfer bar and a current-equalizing busbar arranged along the circumference of the stator phase slip ring; the current busbar is used to connect the plurality of stator phase arc-shaped bars; the stator phase carbon brush is arranged on the stator phase arc-shaped bars; the first stator phase transfer bar is used to connect the stator phase arc-shaped bars with the first stator phase busbar; the second stator phase transfer bar is used to connect the stator phase arc-shaped bars with the second stator phase busbar; The rotor phase connection row includes a plurality of rotor phase arc rows and rotor phase transfer rows arranged along the circumference of the rotor phase slip ring; the rotor phase carbon brushes are arranged on the rotor phase arc rows; the rotor phase transfer rows are used to connect the rotor phase arc rows and the rotor phase busbars.

[0012] A double-fed wind turbine set collector ring of the present invention, wherein the cross-sectional area of ​​the first stator phase busbar is greater than the cross-sectional area of ​​the second stator phase busbar; the number of wiring holes of the first stator phase busbar is equal to the sum of the number of wiring holes of the second stator phase busbar and the rotor phase busbar.

[0013] The present invention provides a collector ring for a doubly-fed wind turbine generator set, wherein the collector mechanism comprises a frame, the frame comprises a bottom plate and a top plate; the stator structure comprises a plurality of columns arranged between the bottom plate and the top plate; a plurality of rotor phase arc rows are sequentially arranged at the lower end of the columns, and a plurality of stator phase arc rows are sequentially arranged at the upper end of the columns.

[0014] A collector ring of a doubly-fed wind turbine generator set of the present invention, wherein the rotor structure comprises a large bearing, a rotor support, a rotor long flange cylinder and a busbar turntable arranged in sequence upward from the bottom plate; a plurality of first transmission rods are arranged circumferentially on the rotor support; a plurality of rotor phase slip rings and stator phase slip rings are distributed in sequence from bottom to top via the first transmission rods; The line-in mechanism comprises a short flange cylinder and a rotor turntable which are sequentially arranged upward from the busbar turntable; the line-in mechanism further comprises a shift fork arranged on the rotor turntable and a plurality of transmission shafts arranged between the rotor turntable and the busbar turntable; The frame further includes a plurality of small bearings which are arranged on the top plate and distributed circumferentially along the edge of the busbar turntable.

[0015] A double-fed wind turbine collector ring of the present invention, wherein the line-in mechanism further comprises a first insulating partition arranged between the stator phase connection terminal, the rotor phase connection terminal and the busbar turntable; a second insulating partition is arranged on the first transmission rod, and the second insulating partition is arranged at the boundary between the rotor phase slip ring and the stator phase slip ring; a third insulating partition is arranged on the column, and the third insulating partition is arranged between the stator phase arc row and the rotor phase arc row; The rotor long flange tube further includes a busbar clamp arranged on the outside; the busbar clamp is used to clamp the rotor phase busbar. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of the present invention; Figure 2 It is a front view schematic diagram of the present invention; Figure 3 It is a schematic diagram of the paths of two currents passing through the present invention; Figure 4 It is a cross-sectional schematic diagram of the present invention; Figure 5 is a schematic diagram of components on the stator phase current path; Figure 6 is a schematic diagram of components on the rotor phase current path; Figure 7 It is an enlarged schematic diagram of a stator phase connection terminal and a rotor phase connection terminal; Figure 8 It is an enlarged schematic diagram of the stator phase carbon brush and its matching parts; Fig. 9 It is an enlarged schematic diagram of the rotor phase carbon brush and its matching parts; Fig.10 It is a three-dimensional schematic diagram of the wire feeding mechanism and the rotor structure; Fig.11 It is a schematic diagram of the main view of the wire feeding mechanism and the rotor structure; Fig.12 It is a cross-sectional schematic diagram of the wire feeding mechanism and the rotor structure; Fig.13 A cross-sectional diagram of the stator structure. DETAILED DESCRIPTION

[0017] Before describing in detail any embodiment of the present invention, it should be understood that the present invention is not limited in its application to the construction and arrangement details of the components described below or illustrated in the following figures. The present invention can have other embodiments and can be practiced or carried out in various ways. In addition, it should be understood that the words and terms used here are for descriptive purposes and should not be considered restrictive. The use of "including" or "having" and its variations herein is intended to cover the items and their equivalents and additional items displayed below. Unless otherwise specified or limited, the terms "install", "connect", "support" and "couple" and their variations are widely used and cover direct installation and indirect installation, connection, support and connection. In addition, "connect" and "couple" are not limited to physical or mechanical connections or connections.

[0018] Furthermore, on the first aspect, in the disclosure of the present invention, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore the above terms cannot be understood as limitations on the present invention; on the second aspect, the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" cannot be understood as a limitation on the quantity.

[0019] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

[0020] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0021] See also Figure 1-13 A double-fed wind turbine collector ring shown in the figure comprises a collector mechanism 1, a first outgoing line mechanism 2 and a second outgoing line mechanism 3 respectively arranged on both sides of the collector mechanism 1, and an incoming line mechanism 4 arranged above the collector mechanism 1; The inlet mechanism 4 includes a stator phase connection terminal 41 and a rotor phase connection terminal 42; the collector mechanism 1 includes a rotor structure 11 and a stator structure 12; the rotor structure 11 includes a stator phase bus 111, a rotor phase bus 112, a stator phase slip ring 113 and a rotor phase slip ring 114; the stator structure 12 includes a stator phase carbon brush 121, a stator phase connection bar 122, a rotor phase carbon brush 123 and a rotor phase connection bar 124; the first outlet mechanism 2 includes a first stator phase bus bar 21; the second outlet mechanism 3 includes a second stator phase bus bar 31 and a rotor phase bus bar 32; The stator phase current of the wind turbine generator set flows through the stator phase connection terminal 41, the stator phase busbar 111, the stator phase slip ring 113, the stator phase carbon brush 121 and the stator phase connection bar 122 in sequence, and is shunted from the stator phase connection bar 122 to the first stator phase busbar 21 and the second stator phase busbar 31; the rotor phase current of the wind turbine generator set flows through the rotor phase connection terminal 42, the rotor phase busbar 112, the rotor phase slip ring 114, the rotor phase carbon brush 123, the rotor phase connection bar 124 and the rotor phase busbar 32 in sequence; the current carrying capacity of the components on the stator phase current path of the wind turbine generator set is greater than the current carrying capacity of the components on the rotor phase current path of the wind turbine generator set.

[0022] In actual use, when the cable of the doubly-fed wind turbine generator set is connected to the present invention, the stator phase current with a larger current value flows through the stator phase terminal 41 with a larger current carrying capacity, the stator phase bus 111, the stator phase slip ring 113, the stator phase carbon brush 121 and the stator phase wiring bar 122 in sequence, and is divided at the stator phase wiring bar 122 to flow to the first stator phase bus 21 of the first outlet mechanism 2 on one side and the second stator phase bus 31 of the second outlet mechanism 3, respectively, thereby reducing the current intensity on a single path and making the heat dissipation area of ​​the components on the stator phase current path large, thereby avoiding the situation of excessive current carrying capacity, excessive temperature and burning of components; the rotor phase current with a smaller current value flows through the current carrying terminal 41 ..., and flows to the first stator phase bus 21 of the first outlet mechanism 2 on one side and the second stator phase bus 31 of the second outlet mechanism 3, respectively, thereby reducing the current intensity on a single path and making the heat dissipation area of ​​the components on The rotor phase connection terminal 42, the rotor phase busbar 112, the rotor phase slip ring 114, the rotor phase carbon brush 123, the rotor phase connection bar 124 and the rotor phase bus bar 32 are relatively small, so that the components on the rotor phase current path can meet the current carrying requirements and avoid the situation of idle current carrying and waste of materials, thereby reducing the manufacturing cost of the collector ring; in addition, since the two groups of cables of the doubly fed wind turbine can be connected from the incoming line mechanism 4, the two currents are highly matched and shunted through the above two current paths of the highly integrated and compact collector mechanism 1, so that the two currents are reasonably distributed and dissipated, and finally are safely and stably led out from the first outgoing line mechanism 2 and the second outgoing line mechanism 3 respectively.

[0023] It is worth mentioning that, in some embodiments, a doubly-fed wind turbine is a common wind turbine generator set, which is mainly composed of the following parts: a wind turbine, a doubly-fed induction generator, a frequency converter, a bidirectional converter and a control system; wherein the blades of the wind turbine convert wind energy into electrical energy by capturing wind energy and driving the rotor to rotate; the doubly-fed induction generator is the core component, usually a cage-type induction motor, which is composed of a stator, a rotor, bearings, etc. The meaning of doubly-fed is that the stator is directly connected to the power grid, while the rotor is connected to the power grid through a frequency converter; the frequency converter and the bidirectional converter are used to adjust the frequency and amplitude of the rotor current, so that the rotor current can be dynamically adjusted according to the wind speed and load requirements, thereby controlling the frequency and amplitude of the output power to meet the needs of the power grid; the control system is used to monitor the wind speed, power grid status, etc. in real time, and control the operation of the wind turbine to optimize the power generation efficiency; Furthermore, the formation process of the stator phase current is that when the wind turbine rotates, the kinetic energy is transferred to the rotor through mechanical rotation. The rotation of the rotor will generate an induced current in the stator winding. This part of the current will be directly synchronized with the power grid, enter the power grid and transmit power to the outside; the formation process of the rotor phase current is that the rotor current is provided by the inverter (bidirectional inverter). By adjusting the frequency and amplitude of the current output by the inverter, the frequency of the rotor current is usually lower than the grid frequency, which enables the wind turbine to operate at different speeds under different wind speeds (i.e. variable speed operation). The adjustment of the rotor current helps control the speed of the wind turbine, and then controls the output power to meet the needs of the power grid; Based on the structure of the doubly-fed wind turbine generator set and the aforementioned formation and transmission logic of the stator phase current and the rotor phase current, it is of great significance to use the present invention to separate the two currents and safely derive them.

[0024] Please continue reading Figure 2 , Fig.12 , Fig.13 In this embodiment, in order to cooperate with the output lines of the two currents of the doubly fed wind turbine set, the stator phase current of the wind turbine set is set to three phases of U, V, and W, and the components on the stator phase current path are set to the corresponding three groups of U, V, and W; the rotor phase current of the wind turbine set is set to three phases of K, L, and M, and the components on the rotor phase current path are set to the corresponding three groups of K, L, and M.

[0025] It is understandable that in other embodiments, the cables of the doubly-fed wind turbine may be connected to the collector rings in other quantities. For example, when the stator phase current is set to four or six phases, the components on the corresponding path should also be set to four or six groups.

[0026] Please continue reading Figure 2 , Figure 3 , Figure 5 , Figure 6 , Fig.12, wherein the stator phase busbar 111 is composed of a plurality of rotor phase busbars 112 with the same cross-sectional specifications; under this arrangement, it is beneficial to reduce the production costs of the two busbars, that is, the current carrying capacity can be increased by stacking multiple busbars with the same cross-sectional specifications; it can be understood that, since the components on the aforementioned stator phase current path are set to the corresponding three groups of U, V, and W, and the components on the rotor phase current path are set to the corresponding three groups of K, L, and M, the distances between the three groups of components corresponding to the two currents and the line feeder mechanism 4 are different. In order to adapt to the aforementioned distances, the stator phase busbar 111 is set to three lengths to adapt to the three groups of U, V, and W components, and the rotor phase busbar 112 is set to three lengths to adapt to the three groups of K, L, and M components; The stator phase slip ring 113 is composed of a plurality of rotor phase slip rings 114 with the same cross-sectional specifications. Under this arrangement, it is beneficial to reduce the production costs of the two slip rings, that is, a plurality of rotor phase slip rings 114 with the same cross-sectional specifications can be stacked to form the stator phase slip ring 113, so that the stator phase slip ring 113 has a higher current carrying capacity, and a gap is appropriately provided between the plurality of stacked rotor phase slip rings 114 so that air flows through the gap, thereby allowing the stator phase slip ring 113 with a larger current to obtain better heat dissipation; in addition, the use of a plurality of rotor phase slip rings 114 with a smaller mass to form the stator phase slip ring 113 is beneficial to reduce the difficulty of assembly and avoid carrying parts that are too heavy; The cross-sectional area of ​​the stator phase wiring row 122 is larger than that of the rotor phase wiring row 124. Under this configuration, the current carrying capacity of the stator phase wiring row 122 is larger than that of the rotor phase wiring row 124, so as to carry more stator phase carbon brushes 121, thereby carrying a larger stator phase current, and enabling the stator phase wiring row 122 to obtain better heat dissipation. The stator phase carbon brush 121 is composed of the rotor phase carbon brush 123 of the same specification; under this arrangement, it is beneficial to reduce the production cost of the two carbon brushes, that is, a larger current carrying capacity can be obtained by using the same carbon brush by stacking the number; The cross-sectional areas of the first stator phase busbar 21 and the second stator phase busbar 31 are both larger than the rotor phase busbar 32; under this arrangement, the first stator phase busbar 21 and the second stator phase busbar 31 obtain a larger current carrying capacity and heat dissipation effect to accommodate a larger stator phase current.

[0027] Please continue reading Figure 7 , Fig.13, wherein the stator phase terminal 41 includes a U-shaped row 411 and a T-shaped row 412; the U-shaped row 411 includes a conductive bottom plate 4111 and two conductive side plates 4112 respectively arranged on both sides of the conductive bottom plate 4111; the T-shaped row 412 includes a conductive connecting plate 4121 and a conductive extension plate 4122; the conductive connecting plate 4121 cooperates with the conductive bottom plate 4111; the two conductive side plates 4112 and the conductive extension plate 4122 are used to connect the cables of the stator phase of the wind turbine; the conductive bottom plate 4111 is used to connect multiple stator phase busbars 111; it can be understood that when the cable of the stator phase current of the doubly fed wind turbine enters the line-in mechanism 4, it needs to be connected to the stator phase terminal 41, and at the same time the stator The phase busbar 111 also needs to be connected to the stator phase connection terminal 41; when the stator phase connection terminal 41 includes a U-shaped row 411 and a T-shaped row 412, and the U-shaped row 411 includes a conductive bottom plate 4111 and two conductive side plates 4112, the U-shaped row 411 can be connected to multiple stator phase current cables and multiple stator phase busbars 111 at the same time. In this embodiment, one U-shaped row 411 can be connected to four stator phase current cables and two stator phase busbars 111 at the same time, and the T-shaped row 412 can be connected to two stator phase current cables at the same time. In addition, the stator phase connection terminal 41 of the aforementioned structure can also have a larger current carrying capacity and a larger heat dissipation area to adapt to a larger stator phase current; The rotor phase connection terminal 42 has a first connection surface 421 and multiple second connection surfaces 422; the first connection surface 421 is used to connect the rotor phase bus 112; the multiple second connection surfaces 422 are used to connect the cable of the rotor phase of the wind turbine; compared with the stator phase connection terminal 41, the rotor phase connection terminal 42 is used to connect the cable of the rotor phase current of the doubly fed wind turbine and the rotor phase bus 112. Since the rotor phase current is small, the rotor phase connection terminal 42 adopts the aforementioned structure with a small volume and simple structure, so as to reduce costs while meeting the current carrying capacity and heat dissipation requirements; in this embodiment, one rotor phase connection terminal 42 can simultaneously connect two rotor phase current cables and one rotor phase bus 112.

[0028] Please continue reading Figure 5 , Figure 6 , Figure 8 , Fig. 9 The rotor phase slip ring 114 includes a plurality of busbar mounting portions 1141 and a plurality of positioning portions 1142 arranged on the inner wall, and a plurality of grooves 1143 arranged on the outer wall along the circumferential direction; a wear debris collection box is provided at the bottom of the stator phase slip ring 113 and the rotor phase slip ring 114.

[0029] Specifically, the busbar mounting portion 1141 extends from the inner wall of the rotor phase slip ring 114 toward the center of the circle, and the matching position of the busbar end and the busbar mounting portion 1141 is on the side of the busbar mounting portion 1141 facing the center of the circle. This arrangement makes the operation more convenient when the two are connected by fasteners; in addition, since the components on the aforementioned stator phase current path are set to the corresponding three groups of U, V, and W, and the components on the rotor phase current path are set to the corresponding three groups of K, L, and M, the lengths of the busbar mounting portion 1141 for the three groups of components corresponding to the two currents are different, so as to maintain an appropriate safety distance between the multiple busbars; multiple positioning portions 1142 are used to install slip rings, so that the multiple slip rings maintain better concentricity; when the collector ring is working, the multiple grooves 1143 will rub against the carbon brush, and the generated debris will enter the debris collection box through the grooves 1143, so as to keep the inside of the collector ring clean.

[0030] Please continue reading Figure 5 , Fig.13 , wherein the stator phase connection row 122 includes a plurality of stator phase arc rows 1221, a first stator phase transfer row 1222, a second stator phase transfer row 1223 and a current equalizing busbar 1224 arranged along the circumference of the stator phase slip ring 113; the current busbar 1224 is used to connect the plurality of stator phase arc rows 1221; the stator phase carbon brush 121 is arranged on the stator phase arc row 1221; the first stator phase transfer row 1222 is used to connect the stator phase arc row 1221 with the first stator phase busbar 21; the second stator phase transfer row 1223 is used to connect the stator phase arc row 1221 with the second stator phase busbar 31.

[0031] It can be understood that since the stator phase current of the doubly fed wind turbine is relatively large, when the double-layer stator phase carbon brush 121 obtains current, it will first be transmitted to the multiple stator phase arc rows 1221 with stronger current carrying capacity. In order to further distribute the current on a single path, the first stator phase transfer row 1222 and the second stator phase transfer row 1223 are respectively connected to the first stator phase bus 21 and the second stator phase bus 31; in addition, in order to balance the current on the multiple stator phase arc rows 1221, multiple current-sharing bus bars 1224 are used to connect the stator phase arc rows 1221.

[0032] Please continue reading Figure 6 , wherein the rotor phase connection row 124 includes a plurality of rotor phase arc rows 1241 and a rotor phase transfer row 1242 arranged along the circumference of the rotor phase slip ring 114; the rotor phase carbon brush 123 is arranged on the rotor phase arc row 1241; the rotor phase transfer row 1242 is used to connect the rotor phase arc row 1241 and the rotor phase bus 32.

[0033] It can be understood that since the rotor phase current of the doubly fed wind turbine is relatively small, when the single-layer rotor phase carbon brush 123 obtains current, it will be directly transmitted to the rotor phase arc row 1241 which is smaller in size and has appropriate current carrying capacity; the rotor phase arc row 1241 can introduce the rotor phase current into the rotor phase bus 32 via the rotor phase transfer row 1242 without the need for current diversion and current equalization, thereby reducing the overall manufacturing cost.

[0034] Please continue reading Figure 2-6 as well as Fig.13 , wherein the cross-sectional area of ​​the first stator phase bus 21 is greater than the cross-sectional area of ​​the second stator phase bus 31; the number of connection holes of the first stator phase bus 21 is equal to the sum of the connection holes of the second stator phase bus 31 and the rotor phase bus 32.

[0035] It can be understood that in this embodiment, since the first outlet mechanism 2 and the second outlet mechanism 3 are respectively arranged on both sides of the collector mechanism 1, the cross-sectional areas of the first stator phase busbar 21 and the second stator phase busbar 31 are set, so that when the current is divided, the current distributed to the first stator phase transfer bar 1222 is larger and enters the first outlet mechanism 2 through the first stator phase busbar 21, and the current distributed to the second stator phase transfer bar 1223 is smaller and enters the second outlet mechanism 3 through the second stator phase busbar 31, and the rotor phase current is introduced into the rotor phase busbar 32 through the rotor phase transfer bar 1242 and also enters the second stator phase busbar 31. Outlet mechanism 3; under this setting, the current values ​​​​derived from the first outlet mechanism 2 and the second outlet mechanism 3 are close, and the heat generated is also close, thereby avoiding excessive current and excessive heat on one side to burn out components; in addition, due to the setting of the number of wiring holes, the number of cables led out from the first outlet mechanism 2 and the second outlet mechanism 3 is also close, which makes the assembly work more convenient and avoids difficulties in assembly work caused by too many cables on one side. At the same time, the weights on both sides are also close, avoiding the situation where the weight on one side is too heavy when the collector ring is installed on the wind turbine and moves under strong wind conditions.

[0036] Please continue reading Figure 2-4 , wherein the current collecting mechanism 1 includes a frame 13, the frame 13 includes a bottom plate 131 and a top plate 132; the stator structure 12 includes a plurality of columns 125 arranged between the bottom plate 131 and the top plate 132; a plurality of rotor phase arc rows 1241 are sequentially arranged at the lower end of the column 125, and a plurality of stator phase arc rows 1221 are sequentially arranged at the upper end of the column 125.

[0037] Specifically, due to the arrangement of the bottom plate 131 and the top plate 132, the connection of the entire frame 13 through the multiple columns 125 is more firmly and stably provided. When multiple rotor phase arc rows 1241 and multiple stator phase arc rows 1221 are sequentially provided on the columns 125, these arc rows also obtain a more stable and firmly connection so as to maintain their position in the active cooperation with the carbon brushes and slip rings; and the multiple rotor phase arc rows 1241 are sequentially arranged at the lower end of the column 125, and the multiple stator phase arc rows 1221 are sequentially arranged at the upper end of the column 125. This distribution design not only makes the structure of the entire collector ring more compact, but also makes the stator phase current and the rotor phase current flow out from the upper and lower arc rows in an orderly manner, thereby reducing the mutual interference between the two currents.

[0038] Please read further Figure 2-6 as well as Figure 10-12 The rotor structure 11 includes a large bearing 115, a rotor support 116, a rotor long flange cylinder 117 and a busbar turntable 118 which are arranged upward from the bottom plate 131 in sequence; a plurality of first transmission rods 119 are arranged on the rotor support 116 along the circumferential direction; a plurality of rotor phase slip rings 114 and stator phase slip rings 113 are distributed in sequence from bottom to top via the first transmission rods 119; The line-in mechanism 4 includes a short flange cylinder 43 and a rotor turntable 44 which are sequentially arranged upward from the busbar turntable 118; the line-in mechanism 4 further includes a shift fork 45 arranged on the rotor turntable 44 and a plurality of transmission shafts 46 arranged between the rotor turntable 44 and the busbar turntable 118; The frame 13 further includes a plurality of small bearings 133 disposed on the top plate 132 and distributed circumferentially along the edge of the busbar turntable 118 .

[0039] Under this arrangement, the movement of the components that need to rotate in the entire collector ring is more stable. Specifically, multiple rotor phase slip rings 114 and stator phase slip rings 113 are distributed from bottom to top in sequence through the cooperation of three first transmission rods 119 and three positioning parts 1142, and correspond to the positions of the aforementioned rotor phase arc row 1241 and stator phase arc row 1221, so that the stator phase current and the rotor phase current flow out from the upper and lower arc rows in an orderly manner, respectively, reducing the mutual interference between the two currents; and the lower end of the entire rotor structure 11 is positioned and rotated by the large bearing 115, and the upper end is positioned by three small bearings 1142. 33 cooperates with the edge of the busbar turntable 118 to realize rotation, so that the entire rotor structure 11 has good concentricity and stable rotation function; further, the rotation of the entire collector ring is coordinated with the windward state of the doubly fed wind turbine set. When the cabin angle of the doubly fed wind turbine set changes, it will drive the fork 45, and then the fork 45 will drive the entire rotor structure 11 to rotate through the rotor turntable 44 and the short flange tube 43. When multiple transmission shafts 46 are provided between the rotor turntable 44 and the busbar turntable 118, a better transmission effect can be achieved, so that the rotation of the entire rotor structure 11 is sensitive and stable.

[0040] Please continue reading Figure 2-4 , wherein the line-in mechanism 4 further includes a first insulating partition 47 arranged between the stator phase connection terminal 41, the rotor phase connection terminal 42 and the busbar turntable 118; a second insulating partition 1191 is arranged on the first transmission rod 119, and the second insulating partition 1191 is arranged at the boundary between the rotor phase slip ring 114 and the stator phase slip ring 113; a third insulating partition 1331 is arranged on the column 125, and the third insulating partition 1331 is arranged between the stator phase arc row 1221 and the rotor phase arc row 1241; it can be understood that through the arrangement of the first insulating partition 47, the second insulating partition 1191 and the third insulating partition 1331, the entire collector ring isolates the three positions that are prone to interference, so that the different currents at the three positions will not affect each other, and thus the collector ring can stably derive the rotor phase current and the stator phase current.

[0041] Please continue reading Figure 5 , Fig.12 , Fig.13 It is worth mentioning that the rotor long flange tube 117 further includes a busbar clamp 1171 arranged on the outside; the busbar clamp 1171 is used to clamp the rotor phase busbar 112; since in the aforementioned rotor layout design, the rotor phase slip ring 114 is arranged at the lower position of the rotor long flange tube 117, the length of the rotor phase busbar 112 is relatively long, and the setting of the busbar clamp 1171 can fix the middle position of the rotor phase busbar 112 to maintain good stability and spacing.

[0042] The above description is only for the best embodiment of the present invention, but it should not be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

Claims

1. A double-fed wind turbine collector ring, characterized in that: It comprises a power collection mechanism (1), a first line outlet mechanism (2) and a second line outlet mechanism (3) respectively arranged on both sides of the power collection mechanism (1), and a line inlet mechanism (4) arranged above the power collection mechanism (1); The line-in mechanism (4) comprises a stator phase connection terminal (41) and a rotor phase connection terminal (42); the power collection mechanism (1) comprises a rotor structure (11) and a stator structure (12); the rotor structure (11) comprises a stator phase busbar (111), a rotor phase busbar (112), a stator phase slip ring (113) and a rotor phase slip ring (114); the stator structure (12) comprises a stator phase carbon brush (121), a stator phase connection bar (122), a rotor phase carbon brush (123) and a rotor phase connection bar (124); the first line-out mechanism (2) comprises a first stator phase busbar (21); the second line-out mechanism (3) comprises a second stator phase busbar (31) and a rotor phase busbar (32); The stator phase current of the wind turbine set flows sequentially through the stator phase connection terminal (41), the stator phase busbar (111), the stator phase slip ring (113), the stator phase carbon brush (121), and the stator phase connection bar (122), and is shunted from the stator phase connection bar (122) to the first stator phase busbar (21) and the second stator phase busbar (31); the rotor phase current of the wind turbine set flows sequentially through the rotor phase connection terminal (42), the rotor phase busbar (112), the rotor phase slip ring (114), the rotor phase carbon brush (123), the rotor phase connection bar (124), and the rotor phase busbar (32); and the current carrying capacity of the components on the stator phase current path of the wind turbine set is greater than the current carrying capacity of the components on the rotor phase current path of the wind turbine set.

2. The double-fed wind turbine collector ring according to claim 1 is characterized in that: The stator phase current of the wind turbine is set to three phases of U, V, and W, and the components on the stator phase current path are set to the corresponding three groups of U, V, and W; the rotor phase current of the wind turbine is set to three phases of K, L, and M, and the components on the rotor phase current path are set to the corresponding three groups of K, L, and M.

3. The double-fed wind turbine collector ring according to claim 2 is characterized in that: The stator phase busbar (111) is composed of a plurality of rotor phase busbars (112) having the same cross-sectional specifications; The stator phase slip ring (113) is composed of a plurality of rotor phase slip rings (114) having the same cross-sectional specifications; The cross-sectional area of ​​the stator phase connection row (122) is larger than that of the rotor phase connection row (124); The stator phase carbon brush (121) is composed of the rotor phase carbon brush (123) having the same specifications; The cross-sectional areas of the first stator phase busbar (21) and the second stator phase busbar (31) are both larger than the rotor phase busbar (32).

4. The double-fed wind turbine collector ring according to claim 3 is characterized in that: The stator phase connection terminal (41) comprises a U-shaped row (411) and a T-shaped row (412); the U-shaped row (411) comprises a conductive bottom plate (4111) and two conductive side plates (4112) respectively arranged on both sides of the conductive bottom plate (4111); the T-shaped row (412) comprises a conductive connection plate (4121) and a conductive extension plate (4122); the conductive connection plate (4121) cooperates with the conductive bottom plate (4111); the two conductive side plates (4112) and the conductive extension plate (4122) are used to connect the cables of the stator phase of the wind turbine; the conductive bottom plate (4111) is used to connect a plurality of stator phase busbars (111); The rotor phase connection terminal (42) comprises a first connection surface (421) and a plurality of second connection surfaces (422); the first connection surface (421) is used for connecting the rotor phase busbar (112); and the plurality of second connection surfaces (422) are used for connecting cables of the rotor phases of the wind turbine generator set.

5. The double-fed wind turbine collector ring according to claim 3 is characterized in that: The rotor phase slip ring (114) comprises a plurality of busbar mounting portions (1141) and a plurality of positioning portions (1142) arranged on an inner wall, and a plurality of grooves (1143) arranged on an outer wall along a circumferential direction; a wear debris collection box is provided at the bottom of both the stator phase slip ring (113) and the rotor phase slip ring (114).

6. The double-fed wind turbine collector ring according to claim 3 is characterized in that: The stator phase connection row (122) comprises a plurality of stator phase arc rows (1221), a first stator phase transfer row (1222), a second stator phase transfer row (1223) and a current equalizing busbar row (1224) arranged along the circumference of the stator phase slip ring (113); the current busbar row (1224) is used to connect the plurality of stator phase arc rows (1221); the stator phase carbon brush (121) is arranged on the stator phase arc row (1221); the first stator phase transfer row (1222) is used to connect the stator phase arc row (1221) and the first stator phase busbar (21); the second stator phase transfer row (1223) is used to connect the stator phase arc row (1221) and the second stator phase busbar (31); The rotor phase connection row (124) comprises a plurality of rotor phase arc rows (1241) and rotor phase transfer rows (1242) arranged along the circumference of the rotor phase slip ring (114); the rotor phase carbon brush (123) is arranged on the rotor phase arc row (1241); and the rotor phase transfer row (1242) is used to connect the rotor phase arc row (1241) and the rotor phase bus bar (32).

7. The double-fed wind turbine collector ring according to claim 3 is characterized in that: The cross-sectional area of ​​the first stator phase busbar (21) is greater than the cross-sectional area of ​​the second stator phase busbar (31); the number of connection holes of the first stator phase busbar (21) is equal to the sum of the number of connection holes of the second stator phase busbar (31) and the rotor phase busbar (32).

8. The double-fed wind turbine collector ring according to claim 6, characterized in that: The current collecting mechanism (1) comprises a frame (13), wherein the frame (13) comprises a bottom plate (131) and a top plate (132); the stator structure (12) comprises a plurality of columns (125) arranged between the bottom plate (131) and the top plate (132); a plurality of rotor phase arc rows (1241) are arranged in sequence at the lower ends of the columns (125), and a plurality of stator phase arc rows (1221) are arranged in sequence at the upper ends of the columns (125).

9. The double-fed wind turbine collector ring according to claim 8, characterized in that: The rotor structure (11) comprises a large bearing (115), a rotor support portion (116), a rotor long flange cylinder (117) and a busbar turntable (118) which are sequentially arranged upward from the bottom plate (131); a plurality of first transmission rods (119) are circumferentially arranged on the rotor support portion (116); a plurality of rotor phase slip rings (114) and stator phase slip rings (113) are sequentially distributed from bottom to top via the first transmission rods (119); The line-in mechanism (4) comprises a short flange cylinder (43) and a rotor turntable (44) which are arranged in sequence upward from the busbar turntable (118); the line-in mechanism (4) further comprises a shift fork (45) arranged on the rotor turntable (44) and a plurality of transmission shafts (46) arranged between the rotor turntable (44) and the busbar turntable (118); The frame (13) further comprises a plurality of small bearings (133) arranged on the top plate (132) and distributed circumferentially along the edge of the busbar turntable (118).

10. The double-fed wind turbine collector ring according to claim 9, characterized in that: The line-in mechanism (4) further comprises a first insulating partition (47) arranged between the stator phase connection terminal (41), the rotor phase connection terminal (42) and the busbar turntable (118); a second insulating partition (1191) is arranged on the first transmission rod (119), and the second insulating partition (1191) is arranged at the boundary between the rotor phase slip ring (114) and the stator phase slip ring (113); a third insulating partition (1331) is arranged on the column (125), and the third insulating partition (1331) is arranged between the stator phase arc row (1221) and the rotor phase arc row (1241); The rotor long flange cylinder (117) further comprises a busbar clamp (1171) arranged on the outside; the busbar clamp (1171) is used to clamp the rotor phase busbar (112).

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