Blade interlocking control circuit, variable pitch system and wind generating set

Abstract

The utility model provides a blade interlocking control circuit, a variable pitch system and a wind generating set, which comprise a central control end, a first relay K1, a second relay K2, a third relay K3, a first door control switch K7, a second door control switch K8, a third door control switch K9, a first shaft cabinet control end, a second shaft cabinet control end and a third shaft cabinet control end, trigger coils of the first relay K1, the second relay K2 and the third relay K3 are respectively connected with a power supply through a first door control switch K7, a second door control switch K8 and a third door control switch K9. The first shaft cabinet control end is connected with the central control end through a contact switch S2 and a contact switch S3, the second shaft cabinet control end is connected with the central control end through a contact switch S1 and a contact switch S3 ', and the third shaft cabinet control end is connected with the central control end through a contact switch S1' and a contact switch S2 '. The zero calibration device solves the problem that when the three blades of the wind generating set need to be subjected to manual zero calibration, the three blades stop on the maximum wind receiving face at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation safety control, in particular to a blade interlocking control circuit, a pitch control system and a wind power generator set. Background Art

[0002] In recent years, the wind power market has grown rapidly, but so have wind turbine-related accidents. The safe and stable operation of wind turbines has become a key focus of the industry. The pitch system, a key component of a wind turbine, controls and actuates the blade pitch angle.

[0003] However, wind turbines require regular manual zeroing of the three blades, which can cause the three blades to stop at the maximum windward surface at the same time. When encountering strong winds, this can easily lead to the impeller overspeeding or even runaway. Utility Model Content

[0004] In response to the deficiencies in the prior art, the utility model provides a blade interlocking control circuit, a pitch control system and a wind turbine generator set, which solves the problem in the prior art that when the wind turbine generator set needs to manually zero the three blades, the three blades are simultaneously stopped on the maximum windward surface.

[0005] At least one embodiment of the present invention provides a blade interlock control circuit, comprising: a central control terminal, a first relay K1, a second relay K2, a third relay K3, a first gate-controlled switch K7, a second gate-controlled switch K8, a third gate-controlled switch K9, a first axis cabinet control terminal, a second axis cabinet control terminal, and a third axis cabinet control terminal, wherein:

[0006] The first door-controlled switch K7 is configured in the first shaft cabinet to detect the open or closed state of the cabinet door of the first shaft cabinet and open or close according to the open or closed state. The trigger coil of the first relay K1 is connected to the power supply through the first door-controlled switch K7;

[0007] The second door-controlled switch K8 is configured in the second shaft cabinet to detect the opening or closing state of the cabinet door of the second shaft cabinet and open or close according to the opening or closing state. The trigger coil of the second relay K2 is connected to the power supply through the second door-controlled switch K8;

[0008] The third door-controlled switch K9 is configured in the third axis cabinet to detect the open or closed state of the cabinet door of the third axis cabinet and open or close according to the open or closed state. The trigger coil of the third relay K3 is connected to the power supply through the third door-controlled switch K9;

[0009] The first axis cabinet control terminal is connected to the central control terminal via the contact switch S2 of the second relay K2 and the contact switch S3 of the third relay K3 connected in series;

[0010] The second axis cabinet control terminal is connected to the central control terminal via the contact switch S1 of the first relay K1 and the contact switch S3' of the third relay K3 connected in series;

[0011] The third axis cabinet control terminal is connected to the central control terminal via the contact switch S1 ′ of the first relay K1 and the contact switch S2 ′ of the second relay K2 connected in series.

[0012] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0013] When it is necessary to manually zero each blade, each control axis cabinet needs to be opened. At this time, when it is necessary to manually zero or maintain the first blade, after the staff opens the cabinet door of the first axis cabinet, the first door-controlled switch K7 detects that the cabinet door is opened. At this time, the first door-controlled switch K7 is in the disconnected state, the trigger coil of the first relay K1 loses power, and the contact switch S1 and contact switch S1' of the first relay K1 are in the disconnected state. At this time, the central control end can only be connected to the first axis cabinet control end through the contact switch S2 of the second relay K2 and the contact switch S3 of the third relay K3. The second axis cabinet control end and the third axis cabinet control end are disconnected due to the loss of power of the trigger coil of the first relay K1, thereby completing the interlocking.

[0014] Similarly, when the second blade needs to be manually zeroed or maintained, after the staff opens the cabinet door of the second axis cabinet, the second door-controlled switch K8 detects that the cabinet door is opened. At this time, the second door-controlled switch K8 is in the disconnected state, the trigger coil of the second relay K2 loses power, and the contact switch S2 and contact switch S2' of the second relay K2 are in the disconnected state. At this time, the central control end can only be connected to the second axis cabinet control end through the contact switch S1 of the first relay K1 and the contact switch S3' of the third relay K3. The first axis cabinet control end and the third axis cabinet control end are disconnected due to the loss of power of the trigger coil of the second relay K2, thereby completing the interlocking.

[0015] Similarly, when the third blade needs to be manually zeroed or maintained, after the staff opens the cabinet door of the third axis cabinet, the third door-controlled switch K9 detects that the cabinet door is opened. At this time, the third door-controlled switch K9 is in the disconnected state, the trigger coil of the third relay K3 loses power, and the contact switch S3 and contact switch S3' of the third relay K3 are in the disconnected state. At this time, the central control end can only be connected to the third axis cabinet control end through the contact switch S1' of the first relay K1 and the contact switch S2' of the second relay K2. The first axis cabinet control end and the second axis cabinet control end are disconnected due to the loss of power of the trigger coil of the third relay K3, thereby completing the interlocking.

[0016] Through the above interlocking, this circuit avoids the situation where three blades are stopped at the maximum wind receiving surface at the same time when the wind turbine generator set needs to perform manual zeroing or maintenance on the three blades.

[0017] In a blade interlock control circuit provided in one embodiment of the present invention, the circuit further includes: a first limit switch K10 and a fourth relay K4, wherein:

[0018] The first limit switch K10 is configured to close when the first blade is at a preset angle, and the trigger coil of the fourth relay K4 is connected to a power supply through the first limit switch K10;

[0019] The trigger coil of the first relay K1 is also connected to a power source via the contact switch S4 of the fourth relay K4.

[0020] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0021] After adopting the above circuit, after completing the zeroing or maintenance of the first blade, the blade is at a preset angle, that is, a safe position. At this time, the first limit switch K10 is closed, and the trigger coil of the fourth relay K4 is energized. The trigger coil of the first relay K1 is energized through the contact switch S4 of the fourth relay K4, and then the contact switch S1 and the contact switch S1' are opened to avoid forgetting to close the cabinet door, resulting in the subsequent central control end being unable to communicate with the corresponding axis cabinet control end, facilitating operation and improving system reliability.

[0022] In a blade interlock control circuit provided in one embodiment of the present invention, the circuit further includes: a second limit switch K11 and a fifth relay K5, wherein:

[0023] The second limit switch K11 is configured to close when the second blade is at a preset angle, and the trigger coil of the fifth relay K5 is connected to a power supply through the second limit switch K11;

[0024] The trigger coil of the second relay K2 is also connected to the power supply through the contact switch S5 of the fifth relay K5.

[0025] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0026] After adopting the above circuit, after completing the zeroing or maintenance of the second blade, the blade is at a preset angle, that is, a safe position. At this time, the second limit switch K11 is closed, and the trigger coil of the fifth relay K5 is energized. The trigger coil of the second relay K2 is energized through the contact switch S5 of the fifth relay K5, and then the contact switch S2 and the contact switch S2' are opened to avoid forgetting to close the cabinet door, resulting in the subsequent central control end being unable to communicate with the corresponding axis cabinet control end, facilitating operation and improving system reliability.

[0027] In a blade interlock control circuit provided in one embodiment of the present invention, the circuit further includes: a third limit switch K12 and a sixth relay K6, wherein:

[0028] The third limit switch K12 is configured to be closed when the third blade is at a preset angle, and the trigger coil of the sixth relay K6 is connected to the power supply through the third limit switch K12;

[0029] The trigger coil of the third relay K3 is also connected to the power supply through the contact switch S6 of the sixth relay K6.

[0030] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0031] After adopting the above circuit, after completing the zeroing or maintenance of the third blade, the blade is at a preset angle, that is, a safe position. At this time, the third limit switch K12 is closed, and the trigger coil of the sixth relay K6 is energized. The trigger coil of the third relay K3 is energized through the contact switch S6 of the sixth relay K6, and then the contact switch S3 and the contact switch S3' are opened to avoid forgetting to close the cabinet door, resulting in the subsequent central control end being unable to communicate with the corresponding axis cabinet control end, facilitating operation and improving system reliability.

[0032] In a blade interlock control circuit provided in one embodiment of the present invention, each power supply is a 24V voltage source.

[0033] In a blade interlock control circuit provided in one embodiment of the present invention, the preset angle is 91 degrees.

[0034] In a blade interlock control circuit provided in one embodiment of the present invention, the preset angle is 91 degrees.

[0035] In a blade interlock control circuit provided in one embodiment of the present invention, the preset angle is 91 degrees.

[0036] The utility model also provides a variable pitch system, comprising a system body and a blade interlocking control circuit as described above.

[0037] The utility model also provides a wind turbine generator set, comprising a wind turbine generator set body and a variable pitch system as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a circuit diagram of a portion of a blade interlocking control circuit of the present utility model;

[0039] Figure 2 This is another circuit diagram of a blade interlocking control circuit of the utility model. DETAILED DESCRIPTION

[0040] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0041] The utility model provides a blade interlocking control circuit. Figure 1 and Figure 2 As shown, it includes: a central control terminal, a first relay K1, a second relay K2, a third relay K3, a first gate-controlled switch K7, a second gate-controlled switch K8, a third gate-controlled switch K9, a first axis cabinet control terminal, a second axis cabinet control terminal and a third axis cabinet control terminal, wherein,

[0042] It is important to understand that in Figure 2 In the embodiment, the first axis cabinet control terminal, the first limit switch K10, the fourth relay K4, the contact switch S4, the first door-controlled switch K7 and the communication terminal VO1 are in the first axis cabinet, the second axis cabinet control terminal, the second limit switch K11, the fifth relay K5, the contact switch S5, the second door-controlled switch K8 and the communication terminal VO2 are in the second axis cabinet, and the third axis cabinet control terminal, the third limit switch K12, the sixth relay K6, the contact switch S6, the third door-controlled switch K9 and the communication terminal VO3 are in the third axis cabinet;

[0043] The first door-controlled switch K7 is configured in the first shaft cabinet to detect the open / close state of the cabinet door of the first shaft cabinet and open or close according to the open / close state. The trigger coil of the first relay K1 is connected to the power supply via the communication terminal VO1 and the first door-controlled switch K7 in sequence.

[0044] The second door-controlled switch K8 is configured in the second shaft cabinet to detect the open / close state of the cabinet door of the second shaft cabinet and open or close according to the open / close state. The trigger coil of the second relay K2 is connected to the power supply via the communication terminal VO2 and the second door-controlled switch K8 in sequence.

[0045] The third door-controlled switch K9 is configured in the third axis cabinet to detect the open or closed state of the cabinet door of the third axis cabinet and open or close according to the open or closed state. The trigger coil of the third relay K3 is connected to the power supply through the communication terminal VO3 and the third door-controlled switch K9 in sequence;

[0046] The first axis cabinet control terminal is connected to the central control terminal via the contact switch S2 of the second relay K2 and the contact switch S3 of the third relay K3 connected in series;

[0047] The second axis cabinet control terminal is connected to the central control terminal via the contact switch S1 of the first relay K1 and the contact switch S3' of the third relay K3 connected in series;

[0048] The third axis cabinet control terminal is connected to the central control terminal via the contact switch S1 ′ of the first relay K1 and the contact switch S2 ′ of the second relay K2 connected in series.

[0049] When it is necessary to manually zero each blade, each control axis cabinet needs to be opened. At this time, when it is necessary to manually zero or maintain the first blade, after the staff opens the cabinet door of the first axis cabinet, the first door-controlled switch K7 detects that the cabinet door is opened. At this time, the first door-controlled switch K7 is in the disconnected state, the trigger coil of the first relay K1 loses power, and the contact switch S1 and contact switch S1' of the first relay K1 are in the disconnected state. At this time, the central control end can only be connected to the first axis cabinet control end through the contact switch S2 of the second relay K2 and the contact switch S3 of the third relay K3. The second axis cabinet control end and the third axis cabinet control end are disconnected due to the loss of power of the trigger coil of the first relay K1, thereby completing the interlocking.

[0050] Similarly, when the second blade needs to be manually zeroed or maintained, after the staff opens the cabinet door of the second axis cabinet, the second door-controlled switch K8 detects that the cabinet door is opened. At this time, the second door-controlled switch K8 is in the disconnected state, the trigger coil of the second relay K2 loses power, and the contact switch S2 and contact switch S2' of the second relay K2 are in the disconnected state. At this time, the central control end can only be connected to the second axis cabinet control end through the contact switch S1 of the first relay K1 and the contact switch S3' of the third relay K3. The first axis cabinet control end and the third axis cabinet control end are disconnected due to the loss of power of the trigger coil of the second relay K2, thereby completing the interlocking.

[0051] Similarly, when the third blade needs to be manually zeroed or maintained, after the staff opens the cabinet door of the third axis cabinet, the third door-controlled switch K9 detects that the cabinet door is opened. At this time, the third door-controlled switch K9 is in the disconnected state, the trigger coil of the third relay K3 loses power, and the contact switch S3 and contact switch S3' of the third relay K3 are in the disconnected state. At this time, the central control end can only be connected to the third axis cabinet control end through the contact switch S1' of the first relay K1 and the contact switch S2' of the second relay K2. The first axis cabinet control end and the second axis cabinet control end are disconnected due to the loss of power of the trigger coil of the third relay K3, thereby completing the interlocking.

[0052] Through the above interlocking, this circuit avoids the situation where three blades are stopped at the maximum wind receiving surface at the same time when the wind turbine generator set needs to perform manual zeroing or maintenance on the three blades.

[0053] Furthermore, the circuit further includes: a first limit switch K10 and a fourth relay K4, wherein,

[0054] The first limit switch K10 is configured to close when the first blade is at a preset angle, and the trigger coil of the fourth relay K4 is connected to a power supply through the first limit switch K10;

[0055] The trigger coil of the first relay K1 is also connected to the power supply via the communication terminal VO1 and the contact switch S4 of the fourth relay K4 in sequence.

[0056] After adopting the above circuit, after completing the zeroing or maintenance of the first blade, the blade is at a preset angle, that is, a safe position. At this time, the first limit switch K10 is closed, and the trigger coil of the fourth relay K4 is energized. The trigger coil of the first relay K1 is energized through the contact switch S4 of the fourth relay K4, and then the contact switch S1 and the contact switch S1' are opened to avoid forgetting to close the cabinet door, resulting in the subsequent central control end being unable to communicate with the corresponding axis cabinet control end, facilitating operation and improving system reliability.

[0057] Furthermore, the circuit further includes: a second limit switch K11 and a fifth relay K5, wherein,

[0058] The second limit switch K11 is configured to close when the second blade is at a preset angle, and the trigger coil of the fifth relay K5 is connected to a power supply through the second limit switch K11;

[0059] The trigger coil of the second relay K2 is also connected to the power supply via the communication terminal VO2 and the contact switch S5 of the fifth relay K5 in sequence.

[0060] After adopting the above circuit: after completing the zeroing or maintenance of the second blade, the blade is at a preset angle, that is, a safe position. At this time, the second limit switch K11 is closed, the trigger coil of the fifth relay K5 is energized, and the trigger coil of the second relay K2 is energized through the contact switch S5 of the fifth relay K5, thereby opening the contact switch S2 and the contact switch S2' to avoid forgetting to close the cabinet door, resulting in the subsequent central control end being unable to communicate with the corresponding axis cabinet control end, facilitating operation and improving system reliability.

[0061] Furthermore, the circuit further includes: a third limit switch K12 and a sixth relay K6, wherein,

[0062] The third limit switch K12 is configured to be closed when the third blade is at a preset angle, and the trigger coil of the sixth relay K6 is connected to the power supply through the third limit switch K12;

[0063] The trigger coil of the third relay K3 is also connected to the power supply via the communication terminal VO3 and the contact switch S6 of the sixth relay K6 in sequence.

[0064] After adopting the above circuit, after completing the zeroing or maintenance of the third blade, the blade is at a preset angle, that is, a safe position. At this time, the third limit switch K12 is closed, and the trigger coil of the sixth relay K6 is energized. The trigger coil of the third relay K3 is energized through the contact switch S6 of the sixth relay K6, and then the contact switch S3 and the contact switch S3' are opened to avoid forgetting to close the cabinet door, resulting in the subsequent central control end being unable to communicate with the corresponding axis cabinet control end, facilitating operation and improving system reliability.

[0065] Furthermore, each power supply is a 24V voltage source, and the preset angle is 91 degrees.

[0066] In summary, after using the above circuit:

[0067] When the first blade needs to be manually zeroed or maintained, after the staff opens the cabinet door of the first axis cabinet, the first door-controlled switch K7 detects that the cabinet door is opened. At this time, the first door-controlled switch K7 is in the disconnected state, the trigger coil of the first relay K1 is de-energized, and the contact switch S1 and contact switch S1' of the first relay K1 are in the disconnected state. At this time, the central control end can only be connected to the first axis cabinet control end through the contact switch S2 of the second relay K2 and the contact switch S3 of the third relay K3. The second axis cabinet control end and the third axis cabinet control end are disconnected due to the de-energization of the trigger coil of the first relay K1, completing the interlocking; after completing the zeroing or maintenance of the first blade, the blade is in the 91° position, that is, the safe position. At this time, the first limit switch K10 is closed, the trigger coil of the fourth relay K4 is energized, and the trigger coil of the first relay K1 is energized through the contact switch S4 of the fourth relay K4, thereby opening the contact switch S1 and contact switch S1';

[0068] Similarly, when the second blade needs to be manually zeroed or maintained, after the staff opens the door of the second axis cabinet, the second door-controlled switch K8 detects that the cabinet door is opened. At this time, the second door-controlled switch K8 is in the disconnected state, the trigger coil of the second relay K2 is de-energized, and the contact switch S2 and contact switch S2' of the second relay K2 are in the disconnected state. At this time, the central control end can only be connected to the second axis cabinet control end through the contact switch S1 of the first relay K1 and the contact switch S3' of the third relay K3. The control end and the third axis cabinet control end are de-energized due to the de-energization of the trigger coil of the second relay K2, causing the contact switch S2 and the contact switch S2' of the second relay K2 to be disconnected, completing the interlocking; after the second blade is zeroed or maintained, the blade is at the 91° position, that is, the safe position. At this time, the second limit switch K11 is closed, and the trigger coil of the fifth relay K5 is energized. The trigger coil of the second relay K2 is energized through the contact switch S5 of the fifth relay K5, thereby opening the contact switch S2 and the contact switch S2';

[0069] Similarly, when the third blade needs to be manually zeroed or maintained, after the staff opens the door of the third axis cabinet, the third door-controlled switch K9 detects that the cabinet door is opened. At this time, the third door-controlled switch K9 is in the disconnected state, the trigger coil of the third relay K3 loses power, and the contact switch S3 and contact switch S3' of the third relay K3 are in the disconnected state. At this time, the central control end can only be connected to the control end of the third axis cabinet through the contact switch S1' of the first relay K1 and the contact switch S2' of the second relay K2. The control end and the second axis cabinet control end are powered off due to the loss of power to the trigger coil of the third relay K3, resulting in the disconnection of the contact switch S3 and the contact switch S3' of the third relay K3, completing the interlocking; after completing the zeroing or maintenance of the third blade, the blade is at the 91° position, that is, the safe position. At this time, the third limit switch K12 is closed, the trigger coil of the sixth relay K6 is energized, and the trigger coil of the third relay K3 is energized through the contact switch S6 of the sixth relay K6, thereby opening the contact switch S3 and the contact switch S3'.

[0070] The utility model also provides a variable pitch system, comprising a system body and a blade interlocking control circuit as described above.

[0071] The utility model also provides a wind turbine generator set, comprising a wind turbine generator set body and a variable pitch system as described above.

[0072] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0073] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0074] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means 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.

[0075] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A blade interlock control circuit, characterized in that: include: Central control terminal, first relay K1, second relay K2, third relay K3, first gate-controlled switch K7, second gate-controlled switch K8, third gate-controlled switch K9, first axis cabinet control terminal, second axis cabinet control terminal and third axis cabinet control terminal, wherein, The first door-controlled switch K7 is configured in the first shaft cabinet to detect the open or closed state of the cabinet door of the first shaft cabinet and open or close according to the open or closed state. The trigger coil of the first relay K1 is connected to the power supply through the first door-controlled switch K7; The second door-controlled switch K8 is configured in the second shaft cabinet to detect the opening or closing state of the cabinet door of the second shaft cabinet and open or close according to the opening or closing state. The trigger coil of the second relay K2 is connected to the power supply through the second door-controlled switch K8; The third door-controlled switch K9 is configured in the third axis cabinet to detect the open or closed state of the cabinet door of the third axis cabinet and open or close according to the open or closed state. The trigger coil of the third relay K3 is connected to the power supply through the third door-controlled switch K9; The first axis cabinet control terminal is connected to the central control terminal via the contact switch S2 of the second relay K2 and the contact switch S3 of the third relay K3 connected in series; The second axis cabinet control terminal is connected to the central control terminal via the contact switch S1 of the first relay K1 and the contact switch S3' of the third relay K3 connected in series; The third axis cabinet control terminal is connected to the central control terminal via the contact switch S1 ′ of the first relay K1 and the contact switch S2 ′ of the second relay K2 connected in series.

2. A blade interlock control circuit according to claim 1, characterized in that: The circuit further includes: a first limit switch K10 and a fourth relay K4, wherein, The first limit switch K10 is configured to close when the first blade is at a preset angle, and the trigger coil of the fourth relay K4 is connected to a power supply through the first limit switch K10; The trigger coil of the first relay K1 is also connected to a power source via the contact switch S4 of the fourth relay K4.

3. The blade interlock control circuit according to claim 1, characterized in that: The circuit further includes: a second limit switch K11 and a fifth relay K5, wherein, The second limit switch K11 is configured to close when the second blade is at a preset angle, and the trigger coil of the fifth relay K5 is connected to a power supply through the second limit switch K11; The trigger coil of the second relay K2 is also connected to the power supply through the contact switch S5 of the fifth relay K5.

4. The blade interlock control circuit according to claim 1, characterized in that: The circuit further includes: a third limit switch K12 and a sixth relay K6, wherein, The third limit switch K12 is configured to be closed when the third blade is at a preset angle, and the trigger coil of the sixth relay K6 is connected to the power supply through the third limit switch K12; The trigger coil of the third relay K3 is also connected to the power supply through the contact switch S6 of the sixth relay K6.

5. The blade interlock control circuit according to claim 1, characterized in that: Each power supply is a 24V voltage source.

6. The blade interlock control circuit according to claim 2, characterized in that: The preset angle is 91 degrees.

7. The blade interlock control circuit according to claim 3, characterized in that: The preset angle is 91 degrees.

8. The blade interlock control circuit according to claim 4, characterized in that: The preset angle is 91 degrees.

9. A pitch control system, characterized in that: The system comprises a system body and a blade interlocking control circuit as claimed in any one of claims 1 to 6.

10. A wind turbine generator set, characterized in that: It comprises a wind turbine generator set body and a pitch control system as claimed in claim 9.

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