Wind power variable pitch device and wind driven generator

Abstract

The utility model discloses a wind power variable pitch device and a wind driven generator, and relates to the field of wind power, any shaft with an interlocking shaft comprises a first interlocking switch, a second interlocking switch, a first blade driver, a second blade driver, a second blade driver, a third interlocking switch and a fourth interlocking switch, the second end is connected with the second end of the first paddle driver of the interlocking shaft of the shaft where the first paddle driver is located, the control end is connected with the third end of the first paddle driver of the shaft where the first paddle driver is located, and the first end and the second end of the first paddle driver are closed based on control of the first paddle driver of the shaft where the first paddle driver is located; the output end of the first paddle driver is connected with the first paddle of the shaft where the first paddle driver is located; and the first paddle is used for rotating based on the first paddle driver. On the basis of the connection relation of the first interlocking switches, the first paddle drivers of the two interlocking shafts need to control the paddles of the shafts where the first paddle drivers are located only when the paddles of the opposite shafts are located at the safe positions, interlocking of the first paddles between the two shafts is achieved, and the safety risk in the using process is reduced.

Description

Technical Field

[0001] This utility model relates to the field of wind power, and in particular to a wind power pitch converter and a wind turbine generator. Background Technology

[0002] With the rapid development of the wind power industry, the installed capacity of wind power is increasing, and the number of people working in the wind power service industry is also growing. However, the skill levels of these personnel vary considerably. In particular, some personnel during the on-site construction phase lack sufficient understanding of the pitch system. Due to issues such as insufficient safety performance in the forced manual mode of the pitch system and a lack of redundancy in safe position judgments, construction personnel may damage the original protection mechanisms of the pitch system during operation, leading to safety risks during on-site construction. Utility Model Content

[0003] The purpose of this utility model is to provide a wind power pitch control device and a wind turbine generator. Based on the connection relationship of the first interlock switch, the first blade driver of the two interlocked shafts will only control the blade of its own shaft when the blade of the other shaft is in a safe position, thereby realizing the first blade interlock between the two shafts and reducing the safety risks during use.

[0004] To solve the above-mentioned technical problems, this utility model provides a wind power pitch control device, wherein any shaft in the wind power pitch control device that has an interlocking shaft includes:

[0005] The first interlock switch has a first end connected to the first end of the first blade driver of the interlock shaft on its own axis, a second end connected to the second end of the first blade driver of the interlock shaft on its own axis, and a control end connected to the third end of the first blade driver of its own axis, and is used to close its first end and second end based on the control of the first blade driver of its own axis.

[0006] The first blade driver has its output end connected to the first blade of its own shaft. It is used to control the first interlock switch of its own shaft to close when the first blade of its own shaft is in a safe position, so as to drive the first blade of its own shaft to rotate when the first interlock switch of the interlock shaft of its own shaft is closed.

[0007] The first blade is used to rotate based on the first blade drive of its own axis.

[0008] On the other hand, it also includes a first manual switch that corresponds one-to-one with the first blade driver;

[0009] The first end of the first manual switch is connected to the second end of the first blade driver, and the second end is connected to the fourth end of the first blade driver, for closing when pressed.

[0010] The first blade driver is specifically used to control the first interlock switch of its own shaft to close when the first blade of its own shaft is in a safe position, and to drive the first blade of its own shaft to rotate when the first interlock switch of the interlock shaft of its own shaft and the first manual switch of its own shaft are closed.

[0011] On the other hand, the non-interlocked shaft of the wind turbine pitch control device includes:

[0012] The second interlock switch, the first and second ends of each of the second interlock switches are connected in series and then connected to the first and second detection ends of the main control system of the wind power pitch device. The control end is connected to the third end of the second blade driver of its own shaft. The second interlock switch is used to connect its own first and second ends based on the control connection of the second blade driver of its own shaft.

[0013] The second blade driver, whose output is connected to the second blade of its own shaft, is used to control the second interlock switch of its own shaft to close when the second blade of its own shaft is in a safe position.

[0014] The second blade is used to rotate based on the second blade drive of its own axis.

[0015] On the other hand, the second interlock switch is a second relay;

[0016] The first end of the coil of the second relay is connected to the third end of the second blade driver, and the first end of the coil of the second relay is connected to the fourth end of the second blade driver. The first and second ends of the contacts of the second relay serve as the first and second ends of the second interlock switch.

[0017] The coil of the second relay is energized for control of the second blade driver based on its own shaft to close the contacts.

[0018] On the other hand, it also includes a second manual switch that corresponds one-to-one with the second blade driver;

[0019] The first end of the second manual switch is connected to the first end of the second blade driver, and the second end is connected to the second end of the second blade driver, for closing when pressed;

[0020] The second blade driver is specifically used to control the second interlock switch of its own shaft to close when the second blade of its own shaft is in a safe position, and to drive the second blade of its own shaft to rotate when the second manual switch of its own shaft is closed.

[0021] On the other hand, the third and fourth ends of each of the first interlock switches are connected in series with the first and second ends of each of the second interlock switches, and then connected to the first and second detection ends of the main control system of the wind power pitch device.

[0022] The first interlock switch is also used to close its third and fourth ends based on the control of the first blade driver on its own axis.

[0023] On the other hand, it also includes motor encoders;

[0024] The motor encoder is connected to either the first blade and the first blade controller or the second blade and the second blade controller on its own shaft, and is used to change its own encoding, which is related to the position of the blade.

[0025] On the other hand, it also includes prompting devices;

[0026] The prompting device is connected to the first blade driver or the second blade controller of its own shaft, and is used to prompt that the first blade or the second blade is in a safe position.

[0027] On the other hand, the first interlock switch is a first relay;

[0028] The first end of the coil of the first relay is connected to the third end of the first blade driver on its own shaft, the second end of the coil of the first relay is connected to the fifth end of the first blade driver on its own shaft, the first end of the first set of contacts of the first relay is connected to the first end of the first blade driver on the interlocked shaft of its own shaft, the second end of the first set of contacts of the first relay is connected to the second end of the first blade driver on the interlocked shaft of its own shaft, the first end of the second set of contacts of the first relay serves as the third end of the first interlock switch, and the second end of the second set of contacts of the first relay serves as the third end of the first interlock switch.

[0029] The first relay is energized for control of the first blade driver on its own axis, so as to close the first set of contacts and the second set of contacts respectively.

[0030] To solve the above-mentioned technical problems, this utility model also provides a wind turbine generator, including the wind turbine pitch control device described above.

[0031] This application provides a wind turbine pitch control device and a wind turbine generator, relating to the wind power field. Each interlocked shaft includes: a first interlock switch, with its first end connected to the first end of the first blade driver of the interlocked shaft on its own shaft, its second end connected to the second end of the first blade driver of the interlocked shaft on its own shaft, and its control end connected to the third end of the first blade driver of its own shaft, closing its first and second ends based on the control of the first blade driver of its own shaft; a first blade driver, with its output end connected to the first blade of its own shaft; and a first blade, used for rotation based on the first blade driver. Based on the connection relationship of the first interlock switch, the first blade drivers of the two interlocked shafts only control the blade of their own shaft when the blade of the other shaft is in a safe position, achieving first blade interlock between the two shafts and reducing safety risks during use. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 A schematic diagram of the structure of a wind power pitch converter provided by this utility model;

[0034] Figure 2 This is a schematic diagram of the structure of an interlocking shaft provided by the present invention;

[0035] Figure 3 This is a schematic diagram of a non-interlocking shaft provided by the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of a main control system provided by this utility model. Detailed Implementation

[0037] The core of this utility model is to provide a wind power pitch control device and a wind turbine generator. Based on the connection relationship of the first interlock switch, the first blade driver of the two interlocked shafts will only control the blade of its own shaft when the blade of the other shaft is in a safe position, thereby realizing the first blade interlock between the two shafts and reducing the safety risks during use.

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] Figure 1 This is a schematic diagram of a wind turbine pitch control device provided by this utility model. Any shaft in the wind turbine pitch control device that has an interlocking shaft includes:

[0040] The first interlock switch has a first end connected to the first end of the first blade driver of the interlock shaft on its own axis, a second end connected to the second end of the first blade driver of the interlock shaft on its own axis, and a control end connected to the third end of the first blade driver of its own axis, and is used to close its first end and second end based on the control of the first blade driver of its own axis.

[0041] The first blade driver has its output end connected to the first blade of its own shaft. It is used to control the first interlock switch of its own shaft to close when the first blade of its own shaft is in a safe position, so as to drive the first blade of its own shaft to rotate when the first interlock switch of the interlock shaft of its own shaft is closed.

[0042] The first blade is used to drive the rotation of the first blade on its own axis.

[0043] Please refer to Figure 1 The pitch system includes three shafts: shaft A, shaft B, and shaft C, with shaft A and shaft C being interlocked.

[0044] Shaft A first blade driver 12, shaft A first interlock switch 11, shaft A first blade 13, shaft C first blade driver 22, shaft C first interlock switch 21, shaft C first blade 23.

[0045] The first interlock switch 11 of shaft A, controlled by the first blade driver 12 of shaft A, is connected to the first blade driver 22 of shaft C. The first interlock switch 21 of shaft C, controlled by the first blade driver 22 of shaft C, is connected to the first blade driver 12 of shaft A. Therefore, before either shaft A or shaft C can operate its blades, the operation must be based on the blade position of the interlocked shaft.

[0046] Furthermore, the first blade actuator can determine the position of the blade, which is a common technique in the field, and this application does not improve upon it.

[0047] The enable logic for safety position relays within each axis has been optimized, and the trigger condition for limit switches has been removed. Simultaneously, to ensure the correctness of the current blade angle, a self-learning completion signal judgment for the current blade has been added, achieving interlocking between axis A and axis C. Specifically:

[0048] Currently, the blade position is either greater than 86 degrees and less than 95 degrees, or greater than -95 degrees and less than -85 degrees, or (shaft A / C is in forced manual mode). Therefore, to operate the shaft A blade, the shaft C blade must be within a safe angle range and the blade angle must be correct (the same applies to operating shaft C). This logic also allows for situations where all three blades are simultaneously stopped at -90 degrees during blade hoisting, while completely avoiding the risk of simultaneously opening all three blades to 0 degrees.

[0049] Once the first blade driver 12 of shaft A determines that the position of the first blade 13 of shaft A is in a safe position, it can control the first interlock switch 11 of shaft A to close. Similarly, once the first blade driver 22 of shaft C determines that the position of the first blade 23 of shaft C is in a safe position, it can control the first interlock switch 21 of shaft C to close. Only after the first interlock switch 21 of shaft C is closed can the first blade driver 12 of shaft A drive the first blade 13 of shaft A, and similarly, only after the first interlock switch 11 of shaft A is closed can the first blade driver 22 of shaft C drive the first blade 23 of shaft C.

[0050] Through the above connection, axis A and axis C can achieve an interlocking relationship.

[0051] This application provides a wind turbine pitch control device and a wind turbine generator, relating to the wind power field. Each interlocked shaft includes: a first interlock switch, with its first end connected to the first end of the first blade driver of the interlocked shaft on its own shaft, its second end connected to the second end of the first blade driver of the interlocked shaft on its own shaft, and its control end connected to the third end of the first blade driver of its own shaft, closing its first and second ends based on the control of the first blade driver of its own shaft; a first blade driver, with its output end connected to the first blade of its own shaft; and a first blade, used for rotation based on the first blade driver. Based on the connection relationship of the first interlock switch, the first blade drivers of the two interlocked shafts only control the blade of their own shaft when the blade of the other shaft is in a safe position, achieving first blade interlock between the two shafts and reducing safety risks during use.

[0052] Based on the above embodiments:

[0053] In some embodiments, a first manual switch corresponding to a first blade driver is also included;

[0054] The first end of the first manual switch is connected to the second end of the first blade driver, and the second end is connected to the fourth end of the first blade driver, for closing when pressed.

[0055] The first blade driver is specifically used to control the first interlock switch of its own shaft to close when the first blade of its own shaft is in a safe position, and to drive the first blade of its own shaft to rotate when the first interlock switch of the interlock shaft of its own shaft and the first manual switch of its own shaft are closed.

[0056] Please refer to Figure 2 , Figure 2 This utility model provides a structural schematic diagram of an interlocking shaft.

[0057] First manual switch 14 for shaft A, first manual switch 24 for shaft C.

[0058] The first terminal of the first propeller driver is DI13, the second terminal is X2C:DI16, the third terminal is DO0, the fourth terminal is X2B:27, and the fifth terminal is 0V.

[0059] The first manual switch is connected to the fourth terminal X2B:27 and the second terminal X2C:DI16. The fourth terminal X2B:27 provides 24V power. When the switch is manually operated and closed, the second terminal X2C:DI16 of the first blade driver receives a 24V power signal. When the switch is opened, the first blade driver receives no 24V signal. By detecting the first manual switch and whether the first interlock switch of the interlocked shaft is closed, it is determined whether the rotation of the first blade on the shaft can be driven, thus ensuring greater safety.

[0060] Figure 3 This is a schematic diagram of a non-interlocking shaft provided by the present invention;

[0061] In some embodiments, the non-interlocked shaft of the wind turbine pitch control unit includes:

[0062] The second interlock switch, after the first and second ends of each second interlock switch are connected in series, is connected to the first and second detection ends of the main control system of the wind power pitch device, and the control end is connected to the third end of the second blade driver on its own axis. The second interlock switch is used to connect its own first and second ends based on the control connection of the second blade driver on its own axis.

[0063] The second blade driver, whose output is connected to the second blade of its own shaft, is used to control the second interlock switch of its own shaft to close when the second blade of its own shaft is in a safe position.

[0064] The second blade is used to drive the rotation of the second blade based on its own axis.

[0065] When shafts A, B, and C exist, and shafts A and C are interlocked, shaft B is an uninterlocked shaft. Shaft B is not interlocked and can be controlled independently. When anti-vortex-induced mode occurs, at least one shaft must be able to control the pitch. Assuming that neither shafts A nor C are in a safe position, shafts A and C cannot operate due to interlocking; in this case, shaft B can be operated.

[0066] Please refer to Figure 3 The second blade driver 32 of shaft B does not collect the connection relationship of the second interlock switch of shaft B. It can control the second interlock switch of shaft B to close when the second blade of shaft C is in a safe position.

[0067] In some embodiments, the second interlock switch is a second relay;

[0068] The first end of the coil of the second relay is connected to the third end of the second blade driver, and the first end of the coil of the second relay is connected to the fourth end of the second blade driver. The first and second ends of the contacts of the second relay serve as the first and second ends of the second interlock switch.

[0069] The coil of the second relay is used to energize the control of the second blade driver based on its own shaft in order to close the contacts.

[0070] The coil 311 of the second relay on shaft B, and the contact 312 of the second relay on shaft B.

[0071] Figure 4 A schematic diagram of the structure of a main control system provided by this utility model;

[0072] Please refer to Figure 4 The main control system needs to detect the status of each blade, so the contacts of each second relay are connected in series with the main control system. If the main control system forms a circuit from 24V to 0V, then it is determined that the contacts of each relay are closed.

[0073] In some embodiments, a second manual switch corresponding to the second blade driver is also included;

[0074] The first end of the second manual switch is connected to the first end of the second blade driver, and the second end is connected to the second end of the second blade driver, for closing when pressed.

[0075] The second blade driver is specifically used to control the second interlock switch of its own shaft to close when the second blade of its own shaft is in a safe position, and to drive the second blade of its own shaft to rotate when the second manual switch of its own shaft is closed.

[0076] Shaft B, second manual switch 34. The first terminal of the second blade driver is DI13, the second terminal is X2B:27, the third terminal is DO0, and the fourth terminal is 0V.

[0077] The second manual switch is connected to its first terminal DI13 and its second terminal X2B:27, which provides 24V power. When the switch is manually operated and closed, the first terminal DI13 of the second blade driver receives a 24V power signal. When the switch is opened, the first blade driver receives no 24V signal. By detecting whether the second manual switch is closed, it is determined whether the rotation of the second blade on its shaft is sufficient, thus ensuring greater safety.

[0078] In some embodiments, the third and fourth terminals of each first interlock switch are connected in series with the first and second terminals of each second interlock switch, and then connected to the first and second detection terminals of the main control system of the wind power pitch device.

[0079] The first interlock switch is also used to close its third and fourth terminals based on the control of the first blade driver on its own axis.

[0080] Please refer to Figure 4 The main control system needs to detect the status of each blade, so the contacts of each second relay and the second set of contacts (third and fourth terminals) of each first relay are connected in series in the main control system. If the main control system forms a circuit from 24V to 0V, it is determined that the contacts of each relay are closed.

[0081] In some embodiments, a motor encoder is also included;

[0082] The motor encoder is connected to the first blade and the first blade controller or the second blade and the second blade controller on its own shaft, respectively, to change its own encoding, which is related to the position of the blade.

[0083] The blade driver reads information from the motor encoder and determines the safe position by using the safe position range set inside the blade driver.

[0084] In some embodiments, a prompting device is also included;

[0085] The alerting device is connected to the first blade driver or the second blade controller of its own axis and is used to alert the user that the first or second blade is in a safe position.

[0086] To provide more accurate prompts to users, a safety position feedback indicator light is added to the outside of the pitch system cabinet. If the current blade is in the range of 86° to 95° or -95° to -85° and has completed the self-learning operation, the safety position indicator light (green) will light up. If the current blade is not in the safe position, the danger position indicator light (red) will light up.

[0087] In some embodiments, the first interlock switch is a first relay;

[0088] The first end of the coil of the first relay is connected to the third end of the first blade driver on its own shaft, the second end of the coil of the first relay is connected to the fifth end of the first blade driver on its own shaft, the first end of the first set of contacts of the first relay is connected to the first end of the first blade driver on the interlocked shaft of its own shaft, the second end of the first set of contacts of the first relay is connected to the second end of the first blade driver on the interlocked shaft of its own shaft, the first end of the second set of contacts of the first relay serves as the third end of the first interlock switch, and the second end of the second set of contacts of the first relay serves as the third end of the first interlock switch.

[0089] The first relay is energized for control of the first blade driver on its own axis, so as to close the first set of contacts and the second set of contacts respectively.

[0090] The first set of contacts of the first interlock switch 11 on shaft A is 112, and the second set of contacts is 113. The first set of contacts of the first interlock switch 21 on shaft C is 212, and the second set of contacts is 213. The on and off logic of the first set of contacts and the second set of contacts is the same, and they are both closed or opened based on the control of the corresponding first blade driver.

[0091] This application also provides a wind turbine generator, including the aforementioned wind turbine pitch control device.

[0092] The description of the wind turbine provided in this application is given in the above embodiments and will not be repeated here.

[0093] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0094] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes said element.

[0095] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wind turbine pitch control device, characterized in that, Any shaft in the wind turbine pitch control device that has an interlocking shaft includes: The first interlock switch has a first end connected to the first end of the first blade driver of the interlock shaft on its own axis, a second end connected to the second end of the first blade driver of the interlock shaft on its own axis, and a control end connected to the third end of the first blade driver of its own axis, and is used to close its first end and second end based on the control of the first blade driver of its own axis. The first blade driver has its output end connected to the first blade of its own shaft. It is used to control the first interlock switch of its own shaft to close when the first blade of its own shaft is in a safe position, so as to drive the first blade of its own shaft to rotate when the first interlock switch of the interlock shaft of its own shaft is closed. The first blade is used to rotate based on the first blade drive of its own axis.

2. The wind turbine pitch control device as described in claim 1, characterized in that, It also includes a first manual switch that corresponds one-to-one with the first blade driver; The first end of the first manual switch is connected to the second end of the first blade driver, and the second end is connected to the fourth end of the first blade driver, for closing when pressed. The first blade driver is specifically used to control the first interlock switch of its own shaft to close when the first blade of its own shaft is in a safe position, and to drive the first blade of its own shaft to rotate when the first interlock switch of the interlock shaft of its own shaft and the first manual switch of its own shaft are closed.

3. The wind turbine pitch control device as described in claim 1, characterized in that, The non-interlocked shaft of the wind turbine pitch control device includes: The second interlock switch, the first and second ends of each of the second interlock switches are connected in series and then connected to the first and second detection ends of the main control system of the wind power pitch device. The control end is connected to the third end of the second blade driver of its own shaft. The second interlock switch is used to connect its own first and second ends based on the control connection of the second blade driver of its own shaft. The second blade driver, whose output is connected to the second blade of its own shaft, is used to control the closing of the second interlock switch of its own shaft when the second blade of its own shaft is in a safe position. The second blade is used to rotate based on the second blade drive of its own axis.

4. The wind turbine pitch control device as described in claim 3, characterized in that, The second interlock switch is the second relay; The first end of the coil of the second relay is connected to the third end of the second blade driver, and the first end of the coil of the second relay is connected to the fourth end of the second blade driver. The first and second ends of the contacts of the second relay serve as the first and second ends of the second interlock switch. The coil of the second relay is energized by the control of the second blade driver based on its own shaft to close the contacts.

5. The wind turbine pitch control device as described in claim 3, characterized in that, It also includes a second manual switch that corresponds one-to-one with the second blade driver; The first end of the second manual switch is connected to the first end of the second blade driver, and the second end is connected to the second end of the second blade driver, for closing when pressed; The second blade driver is specifically used to control the second interlock switch of its own shaft to close when the second blade of its own shaft is in a safe position, and to drive the second blade of its own shaft to rotate when the second manual switch of its own shaft is closed.

6. The wind turbine pitch control device as described in claim 3, characterized in that, The third and fourth terminals of each of the first interlock switches are connected in series with the first and second terminals of each of the second interlock switches, and then connected to the first and second detection terminals of the main control system of the wind power pitch device. The first interlock switch is also used to close its third and fourth ends based on the control of the first blade driver on its own axis.

7. The wind turbine pitch control device as described in claim 1, characterized in that, It also includes motor encoders; The motor encoder is connected to the first blade and the first blade controller or the second blade and the second blade controller on its own shaft, respectively, to change its own encoding, which is related to the position of the blade.

8. The wind turbine pitch control device as described in claim 1, characterized in that, It also includes a notification device; The prompting device is connected to the first blade driver or the second blade controller of its own shaft, and is used to prompt that the first blade or the second blade is in a safe position.

9. The wind turbine pitch control device as described in any one of claims 1 to 8, characterized in that, The first interlock switch is a first relay; The first end of the coil of the first relay is connected to the third end of the first blade driver on its own shaft, the second end of the coil of the first relay is connected to the fifth end of the first blade driver on its own shaft, the first end of the first set of contacts of the first relay is connected to the first end of the first blade driver on the interlocked shaft of its own shaft, the second end of the first set of contacts of the first relay is connected to the second end of the first blade driver on the interlocked shaft of its own shaft, the first end of the second set of contacts of the first relay serves as the third end of the first interlock switch, and the second end of the second set of contacts of the first relay serves as the third end of the first interlock switch. The first relay is energized for control of the first blade driver on its own axis, so as to close the first set of contacts and the second set of contacts respectively.

10. A wind turbine generator, characterized in that, Includes the wind turbine pitch control device as described in any one of claims 1 to 9.

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