Wind turbine variable pitch system safety manual pitch changing device and safety manual pitch changing method

Abstract

The application provides a safety manual pitch changing device and method for a wind turbine pitch system. The device comprises: a mutual exclusion relay provided with a first set of normally closed contacts and a second set of normally closed contacts; a first self-locking relay; a second self-locking relay; a first manual enable circuit comprising a DC power supply, a coil provided with the first self-locking relay, and the first set of normally closed contacts connected in sequence, wherein the first set of normally closed contacts is also connected in parallel with a first set of normally open contacts provided with the first self-locking relay; a second manual enable circuit comprising a DC power supply, a coil provided with the second self-locking relay, and the second set of normally closed contacts connected in sequence, wherein the second set of normally closed contacts is also connected in parallel with a first set of normally open contacts provided with the second self-locking relay; and an inter-axis mutual exclusion circuit comprising a DC power supply, a second set of normally open contacts provided with the first self-locking relay, and a coil provided with the mutual exclusion relay connected in sequence. The device can avoid more than one blade being in the open pitch position at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine pitch control systems, and in particular to a safe manual pitch control device and a safe manual pitch control method for a wind turbine pitch control system. Background Art

[0002] The pitch system is a critical control and safety element of a wind turbine (hereinafter referred to as a wind turbine). Typically, each wind turbine has three pitch systems, each used to adjust the angle of each of the three blades. During normal wind turbine operation, each pitch system automatically adjusts the angle of each blade to maximize the turbine's power generation.

[0003] During maintenance or installation, the wind turbine blades must be manually controlled by the pitch control system to stop in a safe position. During manual pitch control, it is strictly forbidden to have more than one blade in the open position at the same time. Doing so can cause the turbine to overload and pose a serious safety risk to the wind turbine.

[0004] The current manual pitch changing device or manual pitch changing method has the safety risk of more than one blade being in the propeller position at the same time. Therefore, it is necessary to provide a technical solution for safe manual pitch changing. Summary of the Invention

[0005] In response to the above problems, the present invention provides a safe manual pitch changing device and a safe manual pitch changing method for a wind turbine pitch changing system to avoid the safety risk of more than one blade being in the open pitch position at the same time, which is beneficial to improving the safety of manual pitch changing and the overall safety of the wind turbine.

[0006] In a first aspect, the present invention provides a safe manual pitch control device for a wind turbine pitch control system, comprising:

[0007] A mutually exclusive relay, wherein the mutually exclusive relay is provided with a first set of normally closed contacts and a second set of normally closed contacts;

[0008] a first self-latching relay, wherein the first self-latching relay is provided with at least two groups of normally open contacts;

[0009] a second self-latching relay, the second self-latching relay being provided with at least two sets of normally open contacts;

[0010] a first manual enabling circuit, configured to be disposed in the first axle box, the first manual enabling circuit comprising a DC power supply, a coil provided by the first latching relay, and the first set of normally closed contacts, connected in sequence, wherein the first set of normally closed contacts is further connected in parallel with the first set of normally open contacts provided by the first latching relay;

[0011] a second manual enabling circuit for being provided in the second axle box, the second manual enabling circuit comprising a DC power supply, a coil provided in the second latching relay, and the second set of normally closed contacts connected in sequence, wherein the second set of normally closed contacts is further connected in parallel with the first set of normally open contacts provided in the second latching relay;

[0012] The mutual exclusion circuit between the axle boxes includes a DC power supply, a second group of normally open contacts set by the first self-locking relay, and a coil set by the mutual exclusion relay, which are connected in sequence, wherein the second group of normally open contacts set by the first self-locking relay is connected in parallel with the second group of normally open contacts set by the second self-locking relay.

[0013] Furthermore, the mutually exclusive relay is further provided with a third set of normally closed contacts;

[0014] The safe manual pitch control device further comprises:

[0015] The third self-locking relay;

[0016] a third manual enabling circuit, configured to be disposed in the third axle box, the third manual enabling circuit comprising a DC power supply, a coil provided with the third self-latching relay, and the third set of normally closed contacts, connected in sequence, wherein the third set of normally closed contacts is further connected in parallel with the first set of normally open contacts provided with the third self-latching relay;

[0017] In the mutually exclusive circuit between the axle boxes, the second group of normally open contacts provided by the third self-locking relay is also connected in parallel with the second group of normally open contacts provided by the second self-locking relay.

[0018] Furthermore, the DC power supply included in the first manual enabling circuit has a preset high level end and a preset low level end;

[0019] The high voltage end of the first group of normally open contacts provided in the first self-locking relay is connected to the preset high level end;

[0020] The low voltage end of the first group of normally open contacts provided by the first self-locking relay is connected to the manual enabling end of the pitch drive provided by the first axle box;

[0021] The low voltage end of the first group of normally open contacts set by the first self-latching relay is also connected to the high voltage end of the coil set by the first self-latching relay; the low voltage end of the coil set by the first self-latching relay is connected to the preset low level end.

[0022] Furthermore, the DC power supply included in the second manual enabling circuit has a preset high level end and a preset low level end;

[0023] The high voltage end of the first group of normally open contacts provided in the second self-locking relay is connected to the preset high level end;

[0024] The low-voltage end of the first set of normally open contacts of the second self-locking relay is connected to the manual enable end of the pitch drive provided by the second shaft box.

[0025] The low-voltage end of the first set of normally open contacts of the second self-locking relay is also connected to the high-voltage end of the coil provided by the second self-locking relay; and the low-voltage end of the coil provided by the second self-locking relay is connected to the preset low-level end.

[0026] Further, the direct current power supply included in the third manual enable circuit has a preset high-level end and a preset low-level end.

[0027] The high-voltage end of the first set of normally open contacts of the third self-locking relay is connected to the preset high-level end.

[0028] The low-voltage end of the first set of normally open contacts of the third self-locking relay is connected to the manual enable end of the pitch drive provided by the third shaft box.

[0029] The low-voltage end of the first set of normally open contacts of the third self-locking relay is also connected to the high-voltage end of the coil provided by the third self-locking relay; and the low-voltage end of the coil provided by the third self-locking relay is connected to the preset low-level end.

[0030] Further, the direct current power supply included in the shaft-to-shaft mutual exclusion circuit has a preset high-level end and a preset low-level end; the low-voltage end of the coil provided by the mutual exclusion relay is connected to the preset low-level end, and the high-voltage end of the second set of normally open contacts of the first self-locking relay, the second set of normally open contacts of the second self-locking relay, or the second set of normally open contacts of the third self-locking relay is connected to the preset high-level end.

[0031] Further, at least one hand-operated box is further included,

[0032] Each of the hand-operated boxes is provided with a manual enable switch for accessing any manual enable circuit.

[0033] Further, each of the hand-operated boxes is provided with a forward rotation switch or a reverse rotation switch for accessing the forward rotation enable circuit or the reverse rotation enable circuit provided by each shaft box.

[0034] Further, the direct current power supply included in the first manual enable circuit, the direct current power supply included in the second manual enable circuit, the direct current power supply included in the third manual enable circuit, and the direct current power supply included in the shaft-to-shaft mutual exclusion circuit each include a preset high-level end of +24V and a preset low-level end of -24V.

[0035] In a second aspect, the present invention provides a method for safe manual pitch change of a wind turbine pitch system, using the safe manual pitch change device described in the first aspect; the method comprises:

[0036] Insert the hand control box into the designated axle box;

[0037] The manual enabling switch provided on the hand-operated box is closed, so that the manual enabling circuit provided on the designated axle box is connected, and the manual enabling terminal provided on the designated axle box is in a high-level enabling state; the other manual enabling circuits provided on axle boxes other than the designated axle box are disconnected, and the other manual enabling terminals provided on the other axle boxes are in a low-level invalid state;

[0038] The forward rotation switch provided on the hand operation box is closed, so that the forward rotation enabling circuit provided on the designated axle box is connected, the forward rotation enabling terminal provided on the designated axle box is in a high-level enabling state, and the pitch drive provided on the designated axle box drives the corresponding blade to rotate forward; or

[0039] Closing the reversing switch set on the hand operation box connects the reversing enabling circuit set on the designated axle box, and the reversing enabling end set on the designated axle box is in a high-level enabling state. The pitch drive set on the designated axle box drives the corresponding blade to rotate in the opposite direction.

[0040] These and other aspects of the present application will become more apparent from the following description of the embodiment(s). BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1A This is a schematic diagram of the components corresponding to the first axle box in the safe manual pitch control device of the wind turbine pitch control system according to an embodiment of the present application;

[0043] Figure 1B This is a schematic diagram of the components corresponding to the second axle box in the safe manual pitch control device of the wind turbine pitch control system according to an embodiment of the present application;

[0044] Figure 1C This is a schematic diagram of the components corresponding to the third axle box in the safe manual pitch control device of the wind turbine pitch control system according to an embodiment of the present application;

[0045] Figure 2It is a schematic diagram of the composition of the mutual exclusion circuit between the shaft boxes in the safe manual pitch changing device of the wind turbine pitch system of the embodiment of the application.

[0046] Figure 3A It is a schematic diagram of the composition of the mutual exclusion relay in the safe manual pitch changing device of the wind turbine pitch system of the embodiment of the application.

[0047] Figure 3B It is a schematic diagram of the composition of the first self-locking relay, the second self-locking relay and the third self-locking relay in the safe manual pitch changing device of the wind turbine pitch system of the embodiment of the application. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the application will be clearly and completely described in combination with the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative effort fall within the protection scope of the application.

[0049] In order to accurately describe the technical content in the application and to accurately understand the application, the following explanation or definition will be given to the terms used in the description before the specific embodiments are described.

[0050] The electromagnetic relay generally comprises at least one set of contacts such as an electromagnetic coil, a reset spring, a set of contacts, two sets of contacts or three sets of contacts. When the relay is of the dynamic closing type (H type), the two contacts are disconnected when the coil is not powered, and the two contacts are closed after the coil is powered, that is, the contacts are normally open. When the relay is of the dynamic breaking type (D type), the two contacts are closed when the coil is not powered, and the two contacts are disconnected after the coil is powered, that is, the contacts are normally closed.

[0051] The method in the prior art will be introduced below.

[0052] When the wind turbine is hoisted or maintained, manual pitch changing operation is required. Therefore, a pitch changing hand-operated box suitable for harsh working environment is provided. The hand-operated box is simple in wiring, convenient to use and intuitive to operate. The correct use of the hand-operated box can significantly improve the work efficiency and reduce the situation of equipment damage caused by misoperation.

[0053] As Figure 1AAs shown, a Harting interface is usually provided on the side of the housing of the axle box 1. The pitch control box is provided with another corresponding Harting interface (as shown in H1, H2, H3, and H4). After the Harding interface provided on the hand control box is inserted into the Harding interface provided on the axle box 1, the two side terminals of the manual enable switch provided on the hand control box can be connected to the manual enable circuit provided in the axle box, or the two side terminals of the forward rotation switch provided on the hand control box can be connected to the forward rotation enable circuit provided in the axle box, or the two side terminals of the reverse rotation switch provided on the hand control box can be connected to the reverse rotation enable circuit provided in the axle box.

[0054] Typically, the reverse enable terminal of the reverse enable circuit provided in the axle box, the forward enable terminal of the forward enable circuit provided in the axle box, and the manual enable terminal of the manual enable circuit provided in the axle box adopt a common negative connection method.

[0055] Typically, each wind turbine has three pitch control systems, each used to adjust the angle of the three blades. Each pitch control system is housed in its own shaft box. Multiple cables can be connected between the shaft boxes to connect the components within them according to a pre-set electrical schematic.

[0056] When manually changing the pitch, on-site personnel connect the hand-operated control box to the corresponding axle box of each blade and perform the pitch change operation on each blade individually. During the hoisting phase, the axle box is located on the ground or on the tower top. During routine maintenance, the axle box is located on the tower top, and on-site personnel need to carry the hand-operated control box to the axle box corresponding to each blade to perform the operation.

[0057] like Figure 1A 、 Figure 1B As shown in Figure 1C, axle boxes 1, 2, and 3 are each equipped with a DC power supply, with its positive terminal providing a 24V+ level and its negative terminal providing a 24V- level. Each axle box is equipped with an independent variable pitch drive to drive the variable pitch motor. The program logic of the variable pitch drive stipulates that when the manual enable terminal receives a high level, the variable pitch system enters manual mode. Thereafter, if the forward enable terminal receives a high level caused by the hand control box operating the forward switch, the variable pitch system will open or feather the propellers according to the preset speed; if the reverse enable terminal receives a high level caused by the hand control box operating the reverse switch, the variable pitch system will open or feather the propellers according to the preset speed. If the manual enable terminal does not receive a high level, the variable pitch system will not perform the open or feather operation even if the reverse enable terminal receives a high level or the reverse enable terminal receives a high level.

[0058] The technical solution of this application is described in detail below with reference to the accompanying drawings.

[0059] like Figure 1A 、 Figure 1B ,and Figure 2The wind turbine variable pitch system safety manual pitch changing device of the embodiment of the application shown comprises:

[0060] The mutual exclusion relay K100 is provided with a first group of normally closed contacts (11, 12) and a second group of normally closed contacts (21, 22);

[0061] The first self-holding relay K1.1 is provided with at least two groups of normally open contacts;

[0062] The second self-holding relay K2.1 is provided with at least two groups of normally open contacts;

[0063] The first manual enabling circuit is arranged in the first shaft box and comprises a direct current power supply, a coil of the first self-holding relay K1.1, and the first group of normally closed contacts (11, 12) connected in sequence, wherein the first group of normally closed contacts is further connected in parallel with a first group of normally open contacts (21, 24) of the first self-holding relay K1.1;

[0064] The second manual enabling circuit is arranged in the second shaft box and comprises a direct current power supply, a coil of the second self-holding relay K2.1, and the second group of normally closed contacts (21, 22) connected in sequence, wherein the second group of normally closed contacts (21, 22) is further connected in parallel with a first group of normally open contacts (21, 24) of the second self-holding relay K2.1;

[0065] The inter-shaft mutual exclusion circuit comprises a direct current power supply, a second group of normally open contacts (11, 14) of the first self-holding relay K1.1, and a coil of the mutual exclusion relay K100 connected in sequence, wherein the second group of normally open contacts (11, 14) of the first self-holding relay K1.1 is connected in parallel with a second group of normally open contacts (11, 14) of the second self-holding relay K2.1.

[0066] Correspondingly, the hand-operated box is inserted into the shaft box 1, so that a manual enabling switch arranged in the hand-operated box is connected to the first manual enabling circuit; when the manual enabling switch arranged in the hand-operated box is closed, the first manual enabling circuit is turned on, the coil of the first self-holding relay K1.1 is powered, the first group of normally open contacts (21, 24) of the first self-holding relay K1.1 is closed, and

[0067] The second group of normally open contacts (11, 14) set in the first self-locking relay K1.1 is closed, thereby connecting the mutual exclusion circuit between the axle boxes, and the coil set in the mutual exclusion relay K100 is energized, thereby disconnecting the first group of normally closed contacts (11, 12) set in the mutual exclusion relay; and disconnecting the second group of normally closed contacts (21, 22) of the mutual exclusion relay.

[0068] Thus, even if another manual operation box is inserted into the axle box 2 so that the manual enabling switch provided on the manual operation box is connected to the second manual enabling circuit; when the manual enabling switch provided on the manual operation box is closed, the second manual enabling circuit remains disconnected.

[0069] As described above, when the manual enabling switch of a hand-operated box is connected to the first manual enabling circuit and the manual enabling switch is closed, the second manual enabling circuit is in an open state because the second group of normally closed contacts (21, 22) of the mutually exclusive relay K100 is disconnected. In this way, after a hand-operated box is inserted into the axle box 1, the first manual enabling circuit of the axle box is connected and self-locked, and is mutually exclusive with other manual enabling circuits of other axle boxes. In this way, the safety risk of more than one blade being in the open position at the same time can be avoided, which is conducive to improving the safety of manual pitch control and the overall safety of the wind turbine.

[0070] like Figure 1A 、 Figure 1B 、 Figure 1C and Figure 2 As shown, the mutually exclusive relay K100 is further provided with a third group of normally closed contacts (31, 32); the safe manual pitch control device further comprises:

[0071] The third self-locking relay K3.1;

[0072] A third manual enabling circuit is used to be set in the third axle box, the third manual enabling circuit includes a DC power supply, a coil provided with the third self-locking relay K3.1, and the third group of normally closed contacts (31, 32) connected in sequence, wherein the third group of normally closed contacts (31, 32) is also connected in parallel with the first group of normally open contacts (21, 24) provided with the third self-locking relay K3.1;

[0073] In the mutually exclusive circuit between the axle boxes, the second group of normally open contacts (11, 14) provided by the third self-latching relay K3.1 is also connected in parallel with the second group of normally open contacts (11, 14) provided by the second self-latching relay K2.1, that is, it is also connected in parallel with the second group of normally open contacts (11, 14) provided by the first self-latching relay K1.1.

[0074] Correspondingly, the manual operation box is inserted into the axle box 1, so that the manual enabling switch provided on the manual operation box is connected to the first manual enabling circuit; when the manual enabling switch provided on the manual operation box is closed, the first manual enabling circuit is connected, the coil provided on the first self-locking relay K1.1 is energized, so that the first group of normally open contacts (21, 24) provided on the first self-locking relay K1.1 is closed, and

[0075] The second group of normally open contacts (11, 14) of the first self-locking relay K1.1 is closed, thereby connecting the mutual exclusion circuit between the axle boxes, and the coil of the mutual exclusion relay K100 is energized, thereby disconnecting the first group of normally closed contacts (11, 12) of the mutual exclusion relay; and disconnecting the third group of normally closed contacts (31, 32) of the mutual exclusion relay.

[0076] Thus, even if another manual operation box is inserted into the axle box 3 so that the manual enabling switch provided on the manual operation box is connected to the third manual enabling circuit; when the manual enabling switch provided on the manual operation box is closed, the third manual enabling circuit remains disconnected.

[0077] As described above, when the manual enabling switch of a hand-operated box is connected to the first manual enabling circuit and the manual enabling switch is closed, the third group of normally closed contacts (31, 32) of the mutually exclusive relay K100 is disconnected, and the third manual enabling circuit is in an open state. In this way, after a hand-operated box is inserted into the axle box 1, the first manual enabling circuit of the axle box is connected and self-locked, and is mutually exclusive with other manual enabling circuits of other axle boxes. In this way, the safety risk of more than one blade being in the open position at the same time can be avoided, which is conducive to improving the safety of manual pitch control and improving the safety of the wind turbine as a whole.

[0078] The safe manual pitch changing device of the pitch changing system of the wind turbine set of this embodiment, when a hand operating box is inserted into the shaft box 2, its manual enabling switch is connected to the second manual enabling circuit, and the manual enabling switch is closed, because the second group of normally closed contacts (21, 22) of the mutually exclusive relay K100 is disconnected, the first group of normally closed contacts (11, 12) is disconnected, and the third group of normally closed contacts (31, 32) is disconnected, the first manual enabling circuit is in the disconnected state, and the third manual enabling circuit is in the disconnected state. In this way, after a hand operating box is inserted into the shaft box 2, the second manual enabling circuit of the shaft box is connected and self-locked, and remains mutually exclusive with other manual enabling circuits of other shaft boxes. In this way, the safety risk of more than one blade being in the open position at the same time can be avoided, which is conducive to improving the safety of manual pitch changing and improving the safety of the wind turbine as a whole.

[0079] Similarly, in the wind turbine pitch control system safety manual pitch control device of this embodiment, when a manual operation box is inserted into the axle box 3, its manual enable switch is connected to the third manual enable circuit, and the manual enable switch is closed, because the second group of normally closed contacts (21, 22) of the mutually exclusive relay K100 is disconnected, the first group of normally closed contacts (11, 12) is disconnected, and the third group of normally closed contacts (31, 32) is disconnected, the first manual enable circuit is in the disconnected state, and the second manual enable circuit is in the disconnected state. In this way, after a manual operation box is inserted into the axle box 3, the third manual enable circuit of the axle box is connected and self-locked, and maintains mutual exclusion with other manual enable circuits of other axle boxes.

[0080] Typically, the three axle boxes are independently and equally configured. If a manual control box is plugged into each of the three axle boxes at the same time, only the axle box with the manual control box plugged in first will be in manual mode and can control the corresponding blades to open or feather. The axle boxes with the manual control boxes plugged in later will not be in manual mode and cannot control the corresponding blades to open or feather. In this way, only one axle box or blade can be in the manual open or feather state at the same time. This avoids the safety risk of more than one blade being in the open position at the same time, which is beneficial to improving the safety of manual pitch control and the overall safety of the wind turbine.

[0081] The embodiments of the present application provide a safe manual operation device and a manual pitch changing method for a wind turbine pitch changing system, which ensure that only one of the three axle boxes can enter manual mode at the same time, thereby ensuring the safety of the unit and personnel.

[0082] like Figure 1A As shown, the DC power supply included in the first manual enabling circuit has a preset high level end and a preset low level end;

[0083] The high voltage end (21) of the first group of normally open contacts (21, 24) provided in the first self-locking relay K1.1 is connected to the preset high level end;

[0084] The low voltage end (24) of the first group of normally open contacts (21, 24) provided in the first self-locking relay K1.1 is connected to the manual enabling end of the pitch drive provided in the first axle box;

[0085] The low voltage end (24) of the first group of normally open contacts (21, 24) provided in the first latching relay K1.1 is also connected to the high voltage end (A1) of the coil provided in the first latching relay K1.1; the low voltage end (A2) of the coil provided in the first latching relay K1.1 is connected to the preset low level end;

[0086] The high voltage end (11) of the first group of normally closed contacts (11, 12) provided in the mutually exclusive relay K100 is connected to the preset high level end;

[0087] The low voltage end (12) of the first group of normally closed contacts (11, 12) provided in the mutually exclusive relay K100 is connected to the manual enabling end of the pitch drive provided in the first axle box.

[0088] Thus, the first manual enabling circuit includes a DC power supply, a coil provided for the first latching relay K1.1, and the first group of normally closed contacts (11, 12) connected in series, and the first group of normally closed contacts is also connected in parallel with the first group of normally open contacts (21, 24) provided for the first latching relay K1.1.

[0089] In this way, after the first group of normally closed contacts (11, 12) of the mutually exclusive relay K100 is disconnected, the first group of normally open contacts (21, 24) set by the first self-locking relay K1.1 can keep the first manual enabling circuit connected and self-locked, and maintain mutual exclusion with other manual enabling circuits of other axle boxes.

[0090] like Figure 1B As shown, the DC power supply included in the second manual enabling circuit has a preset high level end and a preset low level end;

[0091] The high voltage end (21) of the first group of normally open contacts (21, 24) provided in the second self-locking relay K2.1 is connected to the preset high level end;

[0092] The low voltage end (24) of the first group of normally open contacts (21, 24) provided in the second self-locking relay K2.1 is connected to the manual enabling end of the pitch drive provided in the second axle box;

[0093] The low voltage end (24) of the first group of normally open contacts (21, 24) provided in the second latching relay K2.1 is also connected to the high voltage end (A1) of the coil provided in the second latching relay K2.1; the low voltage end (A2) of the coil provided in the second latching relay K2.1 is connected to the preset low level end;

[0094] The high voltage end (21) of the second group of normally closed contacts (21, 22) provided in the mutually exclusive relay K100 is connected to the preset high level end;

[0095] The low voltage end (22) of the second group of normally closed contacts (21, 22) provided in the mutually exclusive relay K100 is connected to the manual enabling end of the pitch drive provided in the second axle box.

[0096] Thus, the second manual enabling circuit includes a DC power supply, a coil provided for the second latching relay K2.1, and the second group of normally closed contacts (21, 22) connected in series, and the second group of normally closed contacts (21, 22) is also connected in parallel with the first group of normally open contacts (21, 24) provided for the second latching relay K2.1.

[0097] In this way, after the second group of normally closed contacts (21, 22) of the mutually exclusive relay K100 is disconnected, the first group of normally open contacts (21, 24) set by the second self-locking relay K2.1 can keep the second manual enabling circuit connected and self-locked, and maintain mutual exclusion with other manual enabling circuits of other axle boxes.

[0098] like Figure 1C As shown, the DC power supply included in the third manual enabling circuit has a preset high level end and a preset low level end;

[0099] The high voltage end (21) of the first group of normally open contacts (21, 24) provided in the third self-locking relay K3.1 is connected to the preset high level end;

[0100] The low voltage end (24) of the first group of normally open contacts (21, 24) provided in the third self-locking relay K3.1 is connected to the manual enabling end of the pitch drive provided in the third axle box;

[0101] The low voltage end (24) of the first group of normally open contacts (21, 24) provided in the third self-latching relay K3.1 is also connected to the high voltage end (A1) of the coil provided in the third self-latching relay K3.1; the low voltage end (A2) of the coil provided in the third self-latching relay K3.1 is connected to the preset low level end;

[0102] The high voltage end (31) of the third group of normally closed contacts (31, 32) provided in the mutually exclusive relay K100 is connected to the preset high level end;

[0103] The low voltage end (32) of the third group of normally closed contacts (31, 32) provided in the mutually exclusive relay K100 is connected to the manual enabling end of the pitch drive provided in the third axle box.

[0104] Thus, the third manual enabling circuit includes a DC power supply, a coil provided for the third latching relay K3.1, and the third group of normally closed contacts (31, 32) connected in series, and the third group of normally closed contacts (31, 32) is also connected in parallel with the first group of normally open contacts (21, 24) provided for the third latching relay K3.1.

[0105] In this way, after the third group of normally closed contacts (31, 32) of the mutually exclusive relay K100 is disconnected, the first group of normally open contacts (21, 24) set by the third self-locking relay K3.1 can keep the third manual enabling circuit connected and self-locked, and maintain mutual exclusion with other manual enabling circuits of other axle boxes.

[0106] like Figure 2 As shown, the DC power supply included in the mutual exclusion circuit between the axle boxes has a preset high-level end and a preset low-level end; the low-voltage end (A2) of the coil provided in the mutual exclusion relay K100 is connected to the preset low-level end, and the high-voltage end (14) of the second group of normally open contacts (11, 14) provided in the first self-locking relay K1.1, the second group of normally open contacts (11, 14) provided in the second self-locking relay K2.1, or the second group of normally open contacts (11, 14) provided in the third self-locking relay K3.1 is connected to the preset high-level end.

[0107] In the above, equal voltage is achieved between the first set of normally open contacts and the second set of normally open contacts provided in each lock relay, which is conducive to simultaneous response of the two to achieve remote relay control.

[0108] As described above, equal voltage is achieved between the first set of normally closed contacts, the second set of normally closed contacts, and the third set of normally closed contacts provided in the mutually exclusive relay, which is conducive to simultaneous response of the two to achieve remote relay control.

[0109] In this way, in the mutually exclusive circuit between the axle boxes, the second group of normally open contacts (11, 14) set by the first self-locking relay K1.1, the second group of normally open contacts (11, 14) set by the second self-locking relay K2.1, or the second group of normally open contacts (11, 14) set by the third self-locking relay K3.1 are connected in parallel and then connected in series with the coil set by the mutually exclusive relay K100.

[0110] In this way, after any one of the second group of normally open contacts (11, 14) set by the first self-locking relay K1.1, the second group of normally open contacts (11, 14) set by the second self-locking relay K2.1, or the second group of normally open contacts (11, 14) set by the third self-locking relay K3.1 is closed, the first group of normally closed contacts (11, 12) set by the mutually exclusive relay K100, the second group of normally closed contacts (21, 22), and the third group of normally closed contacts (31, 32) are disconnected, so that the first group of normally open contacts (21, 24) set by each locking relay keeps the corresponding manual enabling circuit connected and self-locked, and maintains mutual exclusion with other manual enabling circuits of other axle boxes.

[0111] like Figure 1A 、 1B , 1C and Figure 2 As shown, the preset high level end of the DC power source included in the first manual enable circuit, the preset low level end of the DC power source included in the second manual enable circuit, the preset high level end of the DC power source included in the third manual enable circuit and the preset high level end of the DC power source included in the shaft box interlocking circuit respectively include +24V.

[0112] In this way, the equal voltage is achieved between the first group of normally open contacts and the second group of normally open contacts of the respective lock relay and the first group of normally closed contacts, the second group of normally closed contacts and the third group of normally closed contacts of the interlocking relay, which is beneficial to the simultaneous response of the two, so as to realize the relay control between the remote.

[0113] In this way, after the manual enable circuit is turned on, the manual enable end of each shaft box can be reliably kept at a high level, and the manual operation mode can be reliably kept effective.

[0114] Generally, when the safety manual pitch changing device of the wind turbine pitch system of the embodiment of the application is matched with the wind turbine, at least one hand-operated box is further included, each hand-operated box is provided with a manual enable switch, the manual enable switch is used for being connected to any manual enable circuit, and each hand-operated box is provided with a forward rotation switch or a reverse rotation switch, the forward rotation switch or the reverse rotation switch is used for being connected to the forward rotation enable circuit or the reverse rotation enable circuit of each shaft box. Refer to the foregoing description, and no further description is given.

[0115] Generally, when the safety manual pitch changing device of the wind turbine pitch system of the embodiment of the application is matched with the wind turbine, at least one hand-operated box is further included, each hand-operated box is provided with a manual enable switch, the manual enable switch is used for being connected to any manual enable circuit, and each hand-operated box is provided with a forward rotation switch or a reverse rotation switch, the forward rotation switch or the reverse rotation switch is used for being connected to the forward rotation enable circuit or the reverse rotation enable circuit of each shaft box. Refer to the foregoing description, and no further description is given.

[0116] Inserting the hand-operated box into the specified shaft box;

[0117] Closing the manual enable switch of the hand-operated box, so that the manual enable circuit of the specified shaft box is turned on, the manual enable end of the specified shaft box is in a high level enable state, and the manual enable circuits of other shaft boxes except the specified shaft box are turned off, and the manual enable ends of the other shaft boxes are in a low level invalid state;

[0118] Closing the forward rotation switch of the hand-operated box, so that the forward rotation enable circuit of the specified shaft box is turned on, the forward rotation enable end of the specified shaft box is in a high level enable state, and the pitch drive of the specified shaft box drives the corresponding blade to rotate forward; or

[0119] Closing the reverse rotation switch of the hand-operated box, so that the reverse rotation enable circuit of the specified shaft box is turned on, the reverse rotation enable end of the specified shaft box is in a high level enable state, and the pitch drive of the specified shaft box drives the corresponding blade to rotate reversely.

[0120] The above, the manual enable switch is closed, the manual enable end provided by the shaft box is kept at high level, and the variable pitch drive is in manual mode.

[0121] The forward rotation switch of the variable pitch hand control box is closed, a circuit in which the forward rotation enable end is located is connected through the forward rotation switch, the forward rotation enable end is kept at high level, and the variable pitch drive in manual mode controls the pitch of the blade to be opened or closed in response to the forward rotation operation.

[0122] The reverse rotation switch of the variable pitch hand control box is closed, a circuit in which the reverse rotation enable end is located is connected through the reverse rotation switch, the reverse rotation enable end is kept at high level, and the variable pitch drive in manual mode controls the pitch of the blade to be opened or closed in response to the reverse rotation operation.

[0123] At the same time, the same blade is in any one of the opened or closed state, to avoid misoperation, the forward rotation switch and the reverse rotation switch are usually designed in an interlocking mode. That is, when the forward rotation switch is closed, the reverse rotation switch is opened; or when the reverse rotation switch is closed, the forward rotation switch is opened.

[0124] After the variable pitch is completed, the variable pitch hand control box is separated from the shaft box, the manual mode of the variable pitch drive is invalid, and the variable pitch drive enters the automatic mode by default. In this way, the field personnel insert the variable pitch hand control box into the shaft box, so that the variable pitch system enters the manual mode; then, the forward rotation switch or the reverse rotation switch on the control hand control box is controlled, so that the pitch of the blade is opened or closed.

[0125] Usually, when the safety manual variable pitch device of the variable pitch system of the wind turbine generator set in the embodiment of the application is arranged in a wind turbine, the following steps can be included:

[0126] Step 1: One interlocking relay K100 is installed in any one of the shaft box 1, the shaft box 2 or the shaft box 3. The interlocking relay can be a three-contact electromagnetic relay, and the three groups of contacts are all normally closed contacts;

[0127] When the coil of the interlocking relay K100 is installed in the shaft box 1, the manual enable ends of the variable pitch drives respectively arranged in the three shaft boxes are respectively connected to the high-voltage end of the coil of the interlocking relay arranged in the shaft box 1.

[0128] Step 2: The first manual enable circuit is laid in the shaft box 1, including: one self-locking relay K1.1 is installed in the shaft box 1, and the self-locking relay is a double-contact electromagnetic relay, and the two groups of contacts are all normally open contacts.

[0129] The second manual enable circuit is laid in the shaft box 2, including: one self-locking relay K2.1 is installed in the shaft box 2, and the self-locking relay is a double-contact electromagnetic relay, and the two groups of contacts are all normally open contacts.

[0130] The third manual enable circuit is laid in the shaft box 3, including: installing a self-locking relay K3.1 in the shaft box 3, the self-locking relay is a double-contact electromagnetic relay, and two groups of contacts are both normally open contacts.

[0131] Step 3: connecting one group of normally open contacts of each self-locking relay with one group of normally closed contacts (11 and 12, or 21 and 22, or 31 and 32) of the mutual exclusion relay K100 in parallel, then connecting the coil of each self-locking relay in series, and connecting the high voltage end of the DC power supply to the low voltage end of one group of normally open contacts of each self-locking relay, and connecting the low voltage end of the DC power supply to the low voltage end of the coil of each self-locking relay.

[0132] The above steps 1 to 3 respectively realize the manual enable circuit and the mutual exclusion circuit between shaft boxes as described above, so that only one shaft box or blade can be in the manual opening or feathering state at the same time. In this way, the safety risk of more than one blade being in the opening position at the same time can be avoided, which is beneficial to improve the safety of manual variable pitch and the overall safety of the wind turbine.

[0133] When manual variable pitch is needed, the hand box is inserted into any shaft box, and the corresponding manual enable circuit is connected. The coil of the self-locking relay is first powered on, and then the two groups of normally open contacts of the self-locking relay are closed. Among them, after the first group of normally open contacts is closed, the manual enable circuit can still be connected when the first group of normally open contacts is closed after the normally closed contacts of the mutual exclusion relay are disconnected. In this way, one group of normally open contacts of the self-locking relay can keep the coil of the self-locking relay and the manual enable end of the variable pitch drive of the shaft box continuously powered on after the coil is powered on and closed, so that the shaft box enters the manual mode and can receive the forward and reverse operation signals of the hand box to perform the opening or feathering action. After the second group of normally open contacts is closed, the coil of the mutual exclusion relay is powered on, and then the three groups of normally closed contacts of the mutual exclusion relay are disconnected; in this way, after the other group of normally open contacts of the self-locking relay is closed, the manual enable end of the other two shaft boxes and the DC power supply of each shaft box are in a disconnected state, and the shaft box will not enter the manual mode and will not receive the forward and reverse operation signals of the hand box to perform the opening or feathering action. At this time, if another hand box is inserted into another shaft box, the high level provided by the DC power supply cannot be connected to the manual enable end in the shaft box, and the variable pitch drive of the shaft box does not respond to the forward and reverse operation signals of the hand box. Finally, after the hand box is pulled out, the manual enable switch of the hand box is removed from the manual enable circuit, the manual enable circuit is disconnected, the coil of the mutual exclusion relay is powered off first, and then the coil of each self-locking relay is powered off, the normally open contacts of each self-locking relay return to normally open, and the normally closed contacts of the mutual exclusion relay return to normally closed.

[0134] Similarly, when another manual operation box is inserted into another axle box, the manual mode of the axle box will be connected and self-locked at the same time, and the manual modes of the other two axle boxes will be disconnected. Please refer to the above instructions and do not repeat them here.

[0135] In the description of the present invention, “plurality” means more than two, unless otherwise clearly defined.

[0136] In the present invention, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; they can refer to mechanical connections (e.g., welding, bonding, threads, screws, pins, rivets, etc.) or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0137] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0138] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0139] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0141] The above description is only illustrative of the present invention and not restrictive. Those skilled in the art will understand that many modifications, changes or equivalents may be made without departing from the spirit and scope defined by the claims, and all of them will fall within the scope of protection of the present invention.

Claims

1. A safe manual pitch control device for a wind turbine pitch control system, characterized in that: include: A mutually exclusive relay, wherein the mutually exclusive relay is provided with a first set of normally closed contacts and a second set of normally closed contacts; a first self-latching relay, wherein the first self-latching relay is provided with at least two groups of normally open contacts; a second self-latching relay, the second self-latching relay being provided with at least two sets of normally open contacts; a first manual enabling circuit, configured to be disposed in the first axle box, the first manual enabling circuit comprising a DC power supply, a coil provided by the first latching relay, and the first set of normally closed contacts, connected in sequence, wherein the first set of normally closed contacts is further connected in parallel with the first set of normally open contacts provided by the first latching relay; a second manual enabling circuit for being provided in the second axle box, the second manual enabling circuit comprising a DC power supply, a coil provided in the second latching relay, and the second set of normally closed contacts connected in sequence, wherein the second set of normally closed contacts is further connected in parallel with the first set of normally open contacts provided in the second latching relay; The mutual exclusion circuit between the axle boxes includes a DC power supply, a second group of normally open contacts set by the first self-locking relay, and a coil set by the mutual exclusion relay, which are connected in sequence, wherein the second group of normally open contacts set by the first self-locking relay is connected in parallel with the second group of normally open contacts set by the second self-locking relay.

2. The safe manual pitch control device according to claim 1, characterized in that: The mutually exclusive relay is also provided with a third set of normally closed contacts; The safe manual pitch control device further comprises: The third self-locking relay; a third manual enabling circuit, configured to be disposed in the third axle box, the third manual enabling circuit comprising a DC power supply, a coil provided with the third self-latching relay, and the third set of normally closed contacts, connected in sequence, wherein the third set of normally closed contacts is further connected in parallel with the first set of normally open contacts provided with the third self-latching relay; In the mutually exclusive circuit between the axle boxes, the second group of normally open contacts provided by the third self-locking relay is also connected in parallel with the second group of normally open contacts provided by the second self-locking relay.

3. The safe manual pitch control device according to claim 1, characterized in that: The first manual enabling circuit includes a DC power supply having a preset high level end and a preset low level end; The high voltage end of the first group of normally open contacts provided in the first self-locking relay is connected to the preset high level end; The low voltage end of the first group of normally open contacts provided by the first self-locking relay is connected to the manual enabling end of the pitch drive provided by the first axle box; The low voltage end of the first group of normally open contacts set by the first self-latching relay is also connected to the high voltage end of the coil set by the first self-latching relay; the low voltage end of the coil set by the first self-latching relay is connected to the preset low level end.

4. The safe manual pitch control device according to claim 1, characterized in that: The DC power supply included in the second manual enabling circuit has a preset high level end and a preset low level end; The high voltage end of the first group of normally open contacts provided in the second self-locking relay is connected to the preset high level end; The low voltage end of the first group of normally open contacts provided by the second self-locking relay is connected to the manual enabling end of the pitch drive provided by the second axle box; The low voltage end of the first group of normally open contacts set by the second self-latching relay is also connected to the high voltage end of the coil set by the second self-latching relay; the low voltage end of the coil set by the second self-latching relay is connected to the preset low level end.

5. The safe manual pitch control device according to claim 2, characterized in that: The DC power supply included in the third manual enabling circuit has a preset high level end and a preset low level end; The high voltage end of the first group of normally open contacts provided in the third self-locking relay is connected to the preset high level end; The low voltage end of the first group of normally open contacts provided by the third self-locking relay is connected to the manual enabling end of the pitch drive provided by the third axle box; The low voltage end of the first group of normally open contacts set by the third self-locking relay is also connected to the high voltage end of the coil set by the third self-locking relay; the low voltage end of the coil set by the third self-locking relay is connected to the preset low level end.

6. The safe manual pitch control device according to claim 2, characterized in that: The DC power supply included in the mutual exclusion circuit between the axle boxes has a preset high level end and a preset low level end; the low voltage end of the coil set by the mutual exclusion relay is connected to the preset low level end, and the high voltage end of the second group of normally open contacts set by the first self-locking relay, the second group of normally open contacts set by the second self-locking relay or the second group of normally open contacts set by the third self-locking relay is connected to the preset high level end.

7. The safe manual pitch control device according to claim 2, characterized in that: The DC power supply included in the first manual enabling circuit, the DC power supply included in the second manual enabling circuit, the DC power supply included in the third manual enabling circuit and the DC power supply included in the mutually exclusive circuit between axle boxes respectively include a preset high level end of +24V and a preset low level end of -24V.

8. The safe manual pitch control device according to claim 2, characterized in that: Also includes: At least one handheld box, Each of the hand-operated boxes is provided with a manual enabling switch, and the manual enabling switch is used to be connected to any manual enabling circuit.

9. The safe manual pitch control device according to claim 8, characterized in that: Each of the hand-operated boxes is provided with a forward switch or a reverse switch, and the forward switch or the reverse switch is used to be connected to the forward enabling circuit or the reverse enabling circuit provided in each axle box.

10. A safe manual pitch changing method for a wind turbine pitch changing system, characterized in that: Using the safe manual pitch device according to any one of claims 1 to 9; the method comprising: Insert the hand control box into the designated axle box; The manual enabling switch provided on the hand-operated box is closed, so that the manual enabling circuit provided on the designated axle box is connected, and the manual enabling terminal provided on the designated axle box is in a high-level enabling state; the other manual enabling circuits provided on axle boxes other than the designated axle box are disconnected, and the other manual enabling terminals provided on the other axle boxes are in a low-level invalid state; The forward rotation switch provided on the hand operation box is closed, so that the forward rotation enabling circuit provided on the designated axle box is connected, the forward rotation enabling terminal provided on the designated axle box is in a high-level enabling state, and the pitch drive provided on the designated axle box drives the corresponding blade to rotate forward; or Closing the reversing switch set on the hand operation box connects the reversing enabling circuit set on the designated axle box, and the reversing enabling end set on the designated axle box is in a high-level enabling state. The pitch drive set on the designated axle box drives the corresponding blade to rotate in the opposite direction.

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