Overhaul mode interlocking device of wind power variable pitch system

Abstract

A wind power variable pitch system maintenance mode interlocking device is characterized in that a wind power variable pitch system comprises three variable pitch shaft cabinets 1 #, 2 # and 3 #, each variable pitch shaft cabinet independently controls a corresponding paddle, a manual safety signal generation circuit is arranged in each variable pitch shaft cabinet, and the manual safety signal generation circuit is connected into a 24V power supply circuit after being connected in parallel through a safety relay normally-closed contact and a door control switch; the output is a manual safety signal of the variable pitch shaft cabinet; manual safety signals of all the shaft control cabinets are connected into the central control cabinet through cables, a logic interlocking circuit is arranged in the central control cabinet, and the manual safety signals of all the shaft control cabinets are input into the logic interlocking circuit to serve as control signals. The input of the logic interlocking circuit is connected with an EPC signal from a cabin, and the logic interlocking circuit respectively outputs the EPC signal to a variable pitch shaft cabinet 1 #, a variable pitch shaft cabinet 2 # and a variable pitch shaft cabinet 3 # as the EPC signal; the possibility that three blades of the fan simultaneously reach the 0-degree position is avoided, and the occurrence of galloping accidents of the wind turbine generator caused by out-of-control of the blades of the fan is reduced.

Description

Technical Field

[0001] The present invention belongs to the field of wind power technology, and relates to a method and a device related to angle inspection of a wind power variable pitch system, and in particular to a maintenance mode interlocking device of a wind power variable pitch system. Background Art

[0002] Wind power generation technology has made great progress in the world today. As an important control and protection device for wind turbines, the operability and maintainability of the pitch system are gradually valued by people. At present, during the installation stage of wind turbines, the pitch system needs to be used to assemble the blades one by one, and during the maintenance stage after grid-connected operation, the pitch system needs to be used to assist in the inspection of the blade gear lubrication effect and blade installation torque. At present, many units still have many deficiencies in terms of safety protection level.

[0003] At present, the mainstream variable pitch system is mainly based on 3-axis cabinets, each axis cabinet controls the corresponding blade separately, and a single axis cabinet has an independent PLC or integrated controller. In order to facilitate the operation of on-site personnel, this type of variable pitch system is often designed with manual knobs and forward and reverse knobs. When the wind turbine needs to be hoisted and maintained, the on-site personnel can switch the manual knob to "manual mode" and use the forward and reverse knobs to realize the forward and reverse operation of the blades. Because the above operations are all performed in the hub and the actual blade angle status cannot be observed.

[0004] The current variable pitch system does not have the function of interlocking the three blades when it is manually operated, that is, in manual mode, the three blades can be at the 0° position at the same time. When the three blades are at the 0° position at the same time, it is easy to cause the wind turbine to run away, which will cause serious safety hazards to the safety of maintenance personnel.

[0005] Therefore, a design is required to ensure that only one blade leaves the safe position during the maintenance phase, thereby ensuring the safety of the entire wind turbine and operators. Summary of the invention

[0006] In order to ensure the operability and safety of a variable pitch system during the maintenance phase, the present invention proposes a maintenance mode interlocking device for a wind turbine variable pitch system.

[0007] The present invention adopts the following technical solutions:

[0008] A maintenance mode interlocking device for a wind turbine pitch control system, the wind turbine pitch control system includes three pitch control shaft cabinets 1#, 2#, and 3#, each pitch control shaft cabinet independently controls a corresponding blade, and is characterized in that:

[0009] Each pitch shaft cabinet is equipped with a safety relay to detect the safety position switch signal;

[0010] Each pitch shaft cabinet is equipped with a door-controlled switch to detect the switch status of the pitch shaft cabinet door;

[0011] Each pitch shaft cabinet has a manual safety signal generation circuit, which is connected in parallel by the normally closed contact of the safety relay and the gate switch and then connected to the 24V power supply circuit; the output is the manual safety signal of the pitch shaft cabinet;

[0012] The manual safety signal of each axis control cabinet is connected to the central control cabinet through cables.

[0013] There is a logic interlocking circuit in the central control cabinet. The manual safety signal of each axis control cabinet is input into the logic interlocking circuit as a control signal. The logic interlocking circuit input is connected to the EPC signal from the nacelle and output to the variable pitch shaft cabinets 1#, 2#, and 3# as EPC signals respectively. When one of the variable pitch shaft cabinets is undergoing manual mode maintenance, the logic interlocking circuit is used to disconnect the EPC signal to the other two variable pitch shaft cabinets.

[0014] This application has the following beneficial technical effects:

[0015] Through the above technical transformation, the possibility of the three blades of the wind turbine reaching the 0° position at the same time during the maintenance process is eliminated, which reduces the possibility of the wind turbine blades losing control and causing the wind turbine to run away. The variable pitch door monitoring function is added to avoid the problem of uncontrollable problems after the door falls. The three blades interlocking scheme of the OAT variable pitch system is proposed to eliminate the possibility of the three blades reaching the 0° position at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the cable wiring of the pitch shaft cabinet of this application;

[0017] Figure 2 This is the wiring diagram of the central control cabinet for this application; DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the existing wind turbine pitch control system, when the hardware EFC (safety chain feedback) is 0V, the blades will automatically pitch to the parking position (91° switch trigger) regardless of whether it is in manual operation mode or automatic operation mode.

[0020] An angle interlocking device for a wind turbine pitch control system, the wind turbine pitch control system includes three pitch control shaft cabinets 1#, 2#, and 3#, each pitch control shaft cabinet independently controls the corresponding blade, and a single shaft cabinet is equipped with an independent PLC or integrated controller;

[0021] Each variable pitch shaft cabinet is equipped with a relay K10 to detect the safety position switch (91°) signal and the switch signal of the variable pitch stop position 91°. Relay K10 is connected in series with the safety position switch and connected to the 24V power supply circuit. The safety position switch is a normally closed contact. When the blade does not reach the safety stop position 91°, the normally closed contact is closed. When the blade reaches the safety stop position 91°, the normally closed contact is opened.

[0022] Each variable pitch shaft cabinet is equipped with a door control switch to detect the switch status of the variable pitch shaft cabinet door. The door control switch is a normally open contact. When the cabinet door is closed, the normally open contact is closed, and when the cabinet door is opened, the normally open contact is disconnected.

[0023] The manual safety signal generation circuit is connected to the 24V power supply circuit after the normally closed contact of relay K10 and the door control switch are connected in parallel. When the on-site personnel open the door of the axis control cabinet to perform manual adjustment mode, and the 91° switch is not triggered, the door control switch is disconnected, and the blade has not reached the safety stop position, that is, the safety position switch (91°) is not triggered, the relay K10 is energized, the normally closed contact of relay K10 is in the disconnected state, and the manual safety signal generation circuit outputs the "manual safety signal" of 0V. This indicates that the personnel manually operate a certain axis control cabinet.

[0024] When exiting the manual adjustment mode and closing the cabinet door, the door control switch is disconnected, or the blade reaches the safe stop position, the safety position switch (91°) is triggered, the relay K10 loses power, the normally closed contact of the relay K10 is closed, and the manual safety signal generation circuit outputs the "manual safety signal" of 24V. This indicates that the personnel have exited the manual operation of a certain axis control cabinet, or the corresponding blade of the axis control cabinet is in the safe stop position.

[0025] The manual safety signal of each axis control cabinet is output to the central control cabinet.

[0026] In the pitch central control cabinet, the “manual safety signal” generated by each axis control cabinet is used to interlock the EFC signals of the other two axis control cabinets.

[0027] The manual safety signal of each axis control cabinet is connected to the central control cabinet through cables. Three relays K1, K2, and K3 are installed in the central control cabinet, which are respectively connected to the manual safety signals of pitch axis cabinets 1#, 2#, and 3#. When the "manual safety signal" is 24V, the corresponding relay is energized. When the "manual safety signal" is 0V, the corresponding relay is de-energized.

[0028] The logic interlocking circuit is composed of the normally open contacts of three relays K1, K2, and K3. The logic interlocking circuit consists of one input and three interlocking loops. Each interlocking loop is composed of the normally open contacts of any two of the three relays K1, K2, and K3 connected in series, that is, the normally open contacts of relays K1 and K2 are connected in series and output to the variable pitch shaft cabinet 3#, the normally open contacts of relays K2 and K3 are connected in series and output to the variable pitch shaft cabinet 1#, and the normally open contacts of relays K1 and K3 are connected in series and output to the variable pitch shaft cabinet 2#. The three interlocking loops are connected to one input to connect the EPC signal from the cabin. After passing through the three interlocking loops, the EPC signals of the variable pitch shaft cabinets 1#, 2#, and 3# are output respectively.

[0029] The above circuit achieves the function of leaf interlocking by controlling the EFC signal connected to the three leaves.

[0030] Whenever manual maintenance is performed on any axis control cabinet, the corresponding door switch and 91° switch will be disconnected. When the "manual safety signal" outputs 0V, the corresponding relay will lose power, the normally open contact will be disconnected, and the EFC signal transmitted to the other two blades will also be disconnected, so that the other two blades will be aligned to the parking position and cannot be manually operated, ensuring that only one blade can be manually maintained at a time. For example, when manually operating the variable pitch shaft cabinet 1#, when the "manual safety signal" of the variable pitch shaft cabinet 1# outputs 0V, the corresponding relay K1 will lose power, the normally open contact will be disconnected, and the EFC signal transmitted to the other variable pitch shaft cabinets 2# and 3# will also be disconnected. When the hardware EFC (safety chain feedback) of the variable pitch shaft cabinets 2# and 3# is 0V, the blades will automatically be aligned to the parking position (triggered by the 91° switch).

[0031] Finally, it should be noted that the above description is only an explanation of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail, those skilled in the art can still modify the technical solutions described above or replace some of the technical features with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A maintenance mode interlocking device for a wind turbine pitch control system, wherein the wind turbine pitch control system comprises three pitch control shaft cabinets 1#, 2#, and 3#, each pitch control shaft cabinet independently controls the corresponding blade, and is characterized in that: Each pitch shaft cabinet is equipped with a safety relay to detect the safety position switch signal; Each pitch shaft cabinet is equipped with a door-controlled switch to detect the switch status of the pitch shaft cabinet door; Each pitch shaft cabinet has a manual safety signal generation circuit, which is connected in parallel by the normally closed contact of the safety relay and the gate switch and then connected to the 24V power supply circuit; the output is the manual safety signal of the pitch shaft cabinet; The manual safety signal of each axis control cabinet is connected to the central control cabinet through cables. There is a logic interlocking circuit in the central control cabinet. The manual safety signal of each axis control cabinet is input into the logic interlocking circuit as a control signal. The logic interlocking circuit input is connected to the EPC signal from the nacelle and output to the variable pitch shaft cabinets 1#, 2#, and 3# as EPC signals respectively. When one of the variable pitch shaft cabinets is undergoing manual mode maintenance, the logic interlocking circuit is used to disconnect the EPC signal to the other two variable pitch shaft cabinets.

2. The wind turbine pitch control system maintenance mode interlocking device according to claim 1 is characterized in that: The safety relay is connected in series with the safety position switch and connected to the 24V power supply circuit; the safety position switch is a normally closed contact. When the blade does not reach the safety stop position of 91°, the normally closed contact is closed. When the blade reaches the safety stop position of 91°, the normally closed contact is opened.

3. The wind turbine pitch control system maintenance mode interlocking device according to claim 1 is characterized in that: The door control switch is a normally open contact. When the cabinet door is closed, the normally open contact is closed, and when the cabinet door is opened, the normally open contact is disconnected.

4. The wind turbine pitch control system maintenance mode interlocking device according to claim 1 is characterized in that: The manual safety signal generating circuit outputs a manual safety signal of 0V, indicating that the personnel manually operates a certain axis control cabinet; the manual safety signal generating circuit outputs a manual safety signal of 24V, indicating that the personnel exits manual operation of a certain axis control cabinet, or the corresponding blade of the axis control cabinet is in the safe stop position.

5. The wind turbine pitch control system maintenance mode interlocking device according to claim 1 is characterized in that: The manual safety signal of each axis control cabinet is connected to the central control cabinet through cables. Three interlocking relays K1, K2, and K3 are installed in the central control cabinet, which are connected to the manual safety signals of pitch axis cabinets 1#, 2#, and 3# respectively.

6. The wind turbine pitch control system maintenance mode interlocking device according to claim 5 is characterized in that: The logic interlocking circuit is composed of the normally open contacts of three interlocking relays K1, K2, and K3; the logic interlocking circuit is composed of three interlocking loops, and each interlocking loop is composed of the normally open contacts of any two of the three interlocking relays K1, K2, and K3 connected in series, that is, the normally open contacts of relays K1 and K2 are connected in series and output to variable pitch shaft cabinet 3#, the normally open contacts of relays K2 and K3 are connected in series and output to variable pitch shaft cabinet 1#, and the normally open contacts of relays K1 and K3 are connected in series and output to variable pitch shaft cabinet 2#.

7. The wind turbine pitch control system maintenance mode interlocking device according to claim 6 is characterized in that: The three interlocking circuits are connected to one input to connect the EPC signal from the nacelle; after passing through the three interlocking circuits, the EPC signals of the variable pitch shaft cabinets 1#, 2#, and 3# are output respectively.

8. The wind turbine pitch control system maintenance mode interlocking device according to claim 7 is characterized in that: When the hardware EFC of the pitch shaft cabinet is 0V, the blades will automatically feather to the parking position.

9. The wind turbine pitch control system maintenance mode interlocking device according to claim 8, characterized in that: When manual maintenance is performed on any axis control cabinet, the corresponding door switch or safety position switch will be disconnected. When the manual safety signal outputs 0V, the corresponding interlock relay will lose power and the normally open contact will be disconnected, thereby also disconnecting the EFC signal transmitted to the other two blades. When the EFC signal of the other two blades is 0V, the other two blades will be propeller-aligned to the parking position and cannot be manually operated, ensuring that only one blade can be manually maintained at a time.

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