Multi-drive variable pitch system and wind turbine

Abstract

The application discloses a kind of multi-drive variable pitch systems and fan, the multi-drive variable pitch system is used to drive blade operation according to the control of fan controller, including multiple motors, for driving wheel hub gear operation;Multiple variable pitch drives, the signal end of multiple variable pitch drives is respectively connected with fan controller, and the output end of multiple variable pitch drives is connected with multiple motors one by one corresponding;Each variable pitch drive is used to generate corresponding drive signal according to the control signal output by the fan controller and output;Wherein, multiple variable pitch drives can drive the wheel hub gear operation when any one variable pitch drive fails, to drive the blade to run to preset safety position by the corresponding motor of remaining variable pitch drive drive.This application improves the safety and power of fan system.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind turbine variable pitch control, in particular to a multi-drive variable pitch system and a wind turbine. BACKGROUND

[0002] Wind energy is a clean and renewable energy source, and using wind power generation is very environmentally friendly. In addition, the amount of wind energy is huge, so it is increasingly valued. As the available wind resources on land are becoming less and less, offshore wind power has the advantages of high wind energy content, low turbulence, and less environmental impact compared to onshore wind power. Therefore, the global wind farm construction has shown a trend of developing from land to sea.

[0003] At present, China's offshore wind power is developing towards large-scale units. The variable pitch system, as an important part of the wind turbine control system, has the functions of adjusting the input power of the wind wheel and aerodynamic brake, and directly affects the performance and safety of the wind turbine.

[0004] Most existing variable pitch systems use a single driver to drive a single motor, which in turn drives the operating angle of the entire blade through a single hub gear. Since the offshore wind environment is relatively harsh, if the driver fails suddenly, the blade may not be in a safe position, which makes the wind turbine at risk of being blown down. Therefore, the safety of the existing wind turbine variable pitch system is low. SUMMARY

[0005] The main purpose of the present application is to provide a multi-drive variable pitch system and a wind turbine, which aims to solve the problem of low safety of the existing wind turbine.

[0006] In order to achieve the above purpose, the present application provides a multi-drive variable pitch system for driving the operation of the blade according to the control of the wind turbine controller, comprising:

[0007] A plurality of motors for driving the hub gear to operate;

[0008] A plurality of variable pitch drivers, the signal ends of the plurality of variable pitch drivers are connected with the wind turbine controller respectively, and the output ends of the plurality of variable pitch drivers are connected with the plurality of motors one by one; each variable pitch driver is used to generate a corresponding driving signal according to the control signal output by the wind turbine controller and drive the corresponding motor to drive the hub gear to operate, so as to drive the operation of the blade; wherein,

[0009] When any one of the plurality of variable pitch drivers fails, the remaining variable pitch drivers can be triggered to drive the corresponding motor to drive the hub gear to operate, so as to drive the blade to operate to a preset safe position.

[0010] Optionally, one of the plurality of variable pitch drives is a master variable pitch drive, and the rest of the variable pitch drives are slave variable pitch drives; a communication end of the master variable pitch drive is connected with a communication end of the slave variable pitch drive;

[0011] The master variable pitch drive is configured to, when the master variable pitch drive fails, transmit master drive failure information to the slave variable pitch drives, so that the slave variable pitch drives drive the blades to move to a preset safe position; and the master variable pitch drive is further configured to, when receiving slave drive failure information output by the slave variable pitch drives, generate corresponding drive signals to drive corresponding motors to operate, and transmit the slave drive failure information to the rest of the slave variable pitch drives, so that the rest of the slave variable pitch drives drive corresponding motors to operate, to jointly drive the blades to move to the preset safe position.

[0012] Optionally, the master variable pitch drive is further configured to, when receiving a control signal output by a wind turbine controller, generate corresponding drive signals to drive corresponding motors to operate, and transmit the control signal to the slave variable pitch drives, so that the slave variable pitch drives generate corresponding drive signals to drive corresponding motors to operate, to jointly drive the blades to operate.

[0013] Optionally, the multi-drive variable pitch system comprises a safety chain feedback circuit; controlled ends of the safety chain feedback circuit are connected with safety signal output ends of the plurality of variable pitch drives, respectively; and output ends of the safety chain feedback circuit are connected with safety signal input ends of the plurality of variable pitch drives, respectively.

[0014] The plurality of variable pitch drives can, when any one of the variable pitch drives fails, trigger the safety chain feedback circuit to return a safety chain disconnection signal to the rest of the variable pitch drives, so that the rest of the variable pitch drives drive corresponding motors to drive the hub gear to operate, to drive the blades to move to a preset safe position.

[0015] Optionally, the safety chain feedback circuit comprises a plurality of safety relays and a plurality of safety chain input terminals; control coils of the plurality of safety relays are connected in series in a first power supply loop, safety signal output ends of the plurality of variable pitch drives are connected in the first power supply loop, respectively; the plurality of safety chain input terminals and contacts of the plurality of safety relays are connected in series in a second power supply loop; and the plurality of safety chain input terminals are connected with safety signal input ends of the plurality of variable pitch drives one by one.

[0016] The plurality of variable pitch drives can, when any one of the variable pitch drives fails, trigger the first power supply loop to be disconnected, so that the plurality of safety relays control the second power supply loop to be disconnected, and the plurality of safety chain input terminals return a safety chain disconnection signal to the rest of the variable pitch drives.

[0017] Optionally, the multi-drive variable pitch system further comprises a limit switch, each of the variable pitch drives comprises a limit signal input end configured to be connected with the limit switch;

[0018] The limit switch is configured to output a limit signal to the limit signal input end when the blade runs to the preset safe position.

[0019] The plurality of variable pitch drives are configured to control the corresponding motor to stop running according to the limit signal.

[0020] Optionally, each of the variable pitch drives comprises an emergency stop signal input end.

[0021] The emergency stop signal input end is configured to receive an emergency stop signal output by the wind turbine controller.

[0022] The plurality of variable pitch drives are configured to control the corresponding motor to stop running according to the emergency stop signal.

[0023] Optionally, each of the variable pitch drives comprises a drive circuit and a brake control module, a signal end of the drive circuit is connected with the wind turbine controller, a brake signal output end of the drive circuit is connected with an input end of the brake control module, an output end of the brake control module is connected with the corresponding motor, and output ends of the brake control modules of the plurality of variable pitch drives are connected.

[0024] The drive circuit is configured to generate a brake control signal according to a control signal output by the wind turbine controller to control the corresponding motor to brake / unbrake.

[0025] When any one of the brake control modules of the plurality of variable pitch drives controls the corresponding motor to brake and the rest of the brake control modules control the corresponding motor to unbrake, at least one of the rest of the brake control modules controls the motor to brake to unbrake, and the hub gear controls the blade to run.

[0026] Optionally, the multi-drive variable pitch system comprises a plurality of energy storage devices, each of the variable pitch drives comprises a drive circuit and a charging machine, a signal end of the drive circuit is connected with the wind turbine controller, a charging signal output end of the drive circuit is connected with an input end of the charging machine, output ends of the charging machines are respectively connected with the plurality of energy storage devices, and the output ends of the charging machines are connected.

[0027] The drive circuit is configured to generate a charging signal according to a control signal output by the wind turbine controller to control the corresponding charging machine to charge the corresponding energy storage device.

[0028] When any one of the plurality of the pitch drive fails, the rest of the charging machines charge the plurality of the energy storage devices.

[0029] Optionally, each of the pitch drives comprises a drive chip and a communication chip, signal ends of the communication chip are connected with a fan controller respectively, and a communication end of the communication chip is connected with a communication end of the drive chip; the drive chip comprises a safety signal output end and a safety signal input end; controlled ends of the safety chain feedback circuit are connected with the safety signal output end of the drive chip respectively, and an output end of the safety chain feedback circuit is connected with the safety signal input end of the drive chip;

[0030] When the drive chip / communication chip in any one of the plurality of the pitch drives fails, the plurality of the drive chips can trigger the safety chain feedback circuit to return a safety chain disconnection signal to the drive chips in the rest of the pitch drives, so that the rest of the drive chips drive the corresponding motors to drive the hub gear to operate, and drive the blades to operate to a preset safety position.

[0031] Optionally, the multi-drive pitch system further comprises a limit switch, the drive chip has a limit signal input end, and the limit signal input end is used for being connected with the limit switch;

[0032] The limit switch is used for outputting a limit signal to the limit signal input end when the blades operate to the preset safety position.

[0033] The plurality of the drive chips are used for controlling the corresponding motors to stop operating according to the limit signal.

[0034] Optionally, the drive chip has an emergency stop signal input end,

[0035] The emergency stop signal input end is used for receiving an emergency stop signal output by the fan controller.

[0036] The plurality of the drive chips are used for controlling the corresponding motors to stop operating according to the emergency stop signal.

[0037] In addition, in order to achieve the above-mentioned purpose, the application further provides a fan, which comprises a fan controller, blades and the multi-drive pitch system as described above.

[0038] Optionally, the number of the multi-drive pitch system and the number of the blades are both plural.

[0039] Optionally, each of the plurality of multi-drive variable pitch systems comprises a safety chain feedback circuit; the controlled end of the safety chain feedback circuit is connected with the safety signal output end of each of the plurality of variable pitch drives in the plurality of multi-drive variable pitch systems, and the output end of the safety chain feedback circuit is connected with the safety signal input end of each of the plurality of variable pitch drives in the plurality of multi-drive variable pitch systems.

[0040] When any one of the plurality of variable pitch drives fails, the safety chain feedback circuit returns a safety chain disconnection signal to the remaining variable pitch drives, so that the remaining variable pitch drives drive the corresponding motors to drive the hub gear to operate, and drive the corresponding blades to operate to the preset safety position.

[0041] The present application provides a multi-drive variable pitch system and a fan, which is used to drive the blades to operate according to the control of a fan controller, and comprises a plurality of motors and a plurality of variable pitch drives. The signal end of each of the plurality of variable pitch drives is connected with the fan controller, and the output end of each of the plurality of variable pitch drives is connected with one of the plurality of motors. Each variable pitch drive is used to generate a corresponding driving signal according to the control signal output by the fan controller, and drive the corresponding motor to drive the hub gear to operate, so as to drive the blades to operate. When any one of the plurality of variable pitch drives fails, the remaining variable pitch drives are triggered to drive the corresponding motors to drive the hub gear to operate, so as to drive the blades to operate to the preset safety position. Thus, when any one of the variable pitch drives fails, the remaining variable pitch drives in the normal working state can drive the blades to operate to the safety position, and the fan is in a safe state after the pitch is completed. Even in the case of strong wind or other extreme weather conditions, the fan will not be blown down, which greatly improves the safety of the fan system. Moreover, when the plurality of variable pitch drives are in the normal state, they jointly drive the blades to operate, which greatly increases the power of the variable pitch system, and can meet the high-power requirement of the offshore fan. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor based on the drawings shown.

[0043] Figure 1 The functional module schematic diagram of an embodiment of the multi-drive variable pitch system of the present application;

[0044] Figure 2 The functional module schematic diagram of another embodiment of the multi-drive variable pitch system of the present application;

[0045] Figure 3 A timing diagram of operation control of an embodiment of the multi-drive variable pitch system of the present application;

[0046] Figure 4 Another timing diagram of operation control of an embodiment of the multi-drive variable pitch system of the present application;

[0047] Figure 5 A module diagram of another embodiment of the multi-drive variable pitch system of the present application;

[0048] Figure 6 A timing diagram of brake control of an embodiment of the multi-drive variable pitch system of the present application;

[0049] Figure 7 Another timing diagram of brake control of an embodiment of the multi-drive variable pitch system of the present application;

[0050] Figure 8 A timing diagram of charger charging control of an embodiment of the multi-drive variable pitch system of the present application;

[0051] Figure 9 A functional module diagram of still another embodiment of the multi-drive variable pitch system of the present application.

[0052] The implementation, functional features and advantages of the present application will be further described with reference to the accompanying drawings in conjunction with the embodiments.

[0053] Explanation of reference signs:

[0054] Reference Name Reference Name 100 Fan controller 11 Main variable pitch drive 200 Hub gear 12 Slave variable pitch drive 300 Blade 101 Communication chip 10 Variable pitch drive 102 Drive chip 20 Motor DETAILED DESCRIPTION

[0055] It should be understood that the specific embodiments described herein merely exemplify the application and do not limit the application.

[0056] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0057] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications will also change accordingly.

[0058] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0059] The present invention provides a multi-drive variable pitch system for driving blades to operate according to the control of the wind turbine controller. Figure 1 In one embodiment, the multi-drive pitch system includes:

[0060] Multiple motors 20 for driving the hub gear 200 to operate;

[0061] A plurality of pitch drives 10, wherein the signal ends of the plurality of pitch drives 10 are respectively connected to the wind turbine controller 100, and the output ends of the plurality of pitch drives 10 are connected one-to-one with the plurality of motors 20; each pitch drive 10 is used to generate a corresponding drive signal according to the control signal output by the wind turbine controller 100 and drive the corresponding motor 20 to drive the hub gear 200 to operate, thereby driving the blades 300 to operate; wherein,

[0062] When any one of the pitch drives 10 fails, the plurality of pitch drives 10 can trigger the remaining pitch drives 10 to drive the corresponding motor 20 to drive the hub gear 200 to operate, thereby driving the blades 300 to a preset safe position to complete the propeller feathering.

[0063] The multi-drive variable pitch system can be installed in a wind turbine generator set to drive a blade 300 in the set. In this embodiment, the wind turbine controller 100 is used to manage wind turbine operation. It can be composed of a wind turbine PLC (Programmable Logic Controller) and its functional expansion modules, equipped with multiple communication interfaces, and mainly implements normal wind turbine operation control, unit safety protection, fault detection and processing, operating parameter setting, data recording and display, etc. The wind turbine controller 100 also continuously reads information such as the status and temperature of multiple variable pitch drives 10.

[0064] The communication end of the variable pitch drive 10 can be a CAN (Controller Area Network) bus communication end, each variable pitch drive 10 and the fan controller 100 can be connected through a CAN communication line, and the control signal of the fan controller 100 is sent to the variable pitch drive 10 through communication.

[0065] The variable pitch drive 10 is generally in a normal working state or a fault state, when all the variable pitch drives 10 are in the normal working state, the fan controller 100 sends a control signal, the control signal can include operation instructions of the running speed, the running angle and the running time of the blade 300 and the like, and each variable pitch drive 10 generates a corresponding driving signal according to the control information and drives the corresponding motor 20 to drive the hub gear 200 to run, so as to drive the blade 300 to run; the control information can also include feathering instructions and emergency stop information, and when the variable pitch drives 10 receive the feathering instructions, the corresponding motors 20 are driven to control the blade 300 to run to a preset safe position, so as to complete feathering; the preset safe position is a position set in advance according to the actual situation of the fan, which can include angle and relative position information and the like; when the variable pitch drives 10 receive the emergency stop information, the corresponding motors 20 are controlled to brake, so as to stop running and drive the blade 300 to stop running.

[0066] When one or several of the variable pitch drives 10 are in fault, the variable pitch drive 10 in fault can detect its own fault information and send the fault information to the fan controller 100 and the remaining variable pitch drives 10 in normal working state, and the variable pitch drives 10 in normal working state drive the corresponding motor 20 to drive the hub gear 200 to run, so as to complete feathering.

[0067] In this embodiment, the multi-drive variable pitch system is used to drive the blades 300 to operate according to the control of the wind turbine controller 100, which includes a plurality of motors 20 and a plurality of variable pitch drives 10, each of which is used to generate a corresponding drive signal according to the control signal output by the wind turbine controller 100 and drive the corresponding motor 20 to drive the hub gear 200 to operate, so as to drive the blades 300 to operate; wherein, when any one of the variable pitch drives 10 fails, the remaining variable pitch drives 10 can be triggered to drive the corresponding motor 20 to drive the hub gear 200 to operate, so as to drive the blades 300 to operate to a preset safe position. Thus, when any one of the variable pitch drives 10 fails, the remaining variable pitch drives 10 in a normal working state can drive the blades 300 to operate to a safe position, and after feathering is completed, the entire wind turbine is in a safe state, even if extreme weather conditions such as strong wind occur, the wind turbine will not be blown down, greatly improving the safety of the wind turbine system. And when all the variable pitch drives 10 are in a normal state, they jointly drive the blades 300 to operate, greatly increasing the power of the variable pitch system, which is sufficient to meet the high-power requirements of offshore wind turbines. In addition, the probability of simultaneous failure of multiple variable pitch drives 10 is small, thereby improving the risk resistance of the wind turbine system.

[0068] In an embodiment, one of the plurality of variable pitch drives 10 is a master variable pitch drive, and the remaining variable pitch drives are slave variable pitch drives; the communication end of the master variable pitch drive is connected with the communication end of the slave variable pitch drive; the master variable pitch drive is used to, when it fails, transmit master drive failure information to the slave variable pitch drives, so that the slave variable pitch drives drive the blades 300 to operate to a preset safe position; and is also used to, when receiving slave drive failure information output by the slave variable pitch drives, generate a corresponding drive signal to drive the corresponding motor 20 to operate, and transmit the slave drive failure information to the remaining slave variable pitch drives, so that the remaining slave variable pitch drives drive the corresponding motor 20 to operate, to jointly drive the blades 300 to operate to a preset safe position.

[0069] In this embodiment, the master and slave variable pitch drives can be connected through CAN communication lines, and each variable pitch drive can communicate information such as its current working state (normal working or failure, and what kind of failure), received input signals, etc. If any variable pitch drive detects that it has failed, it needs to send the failure information to the wind turbine controller 100 and other variable pitch drives, so that the remaining variable pitch drives perform feathering and other operations.

[0070] When the master variable pitch driver fails, it will transmit its own master driver failure information to the slave variable pitch driver, so that the slave variable pitch driver controls the corresponding motor 20 to drive the blade 300 to run to a preset safe position to complete feathering. When any slave variable pitch driver fails, the failed slave variable pitch driver will also send its own failure information, i.e. slave driver failure information, to the master variable pitch driver. After receiving the information, the master variable pitch driver generates a corresponding driving signal to drive the corresponding motor 20 to run, and transmits the information to the remaining slave variable pitch drivers in a normal working state, so that the remaining slave variable pitch drivers drive the corresponding motor 20 to run, and the master and slave together drive the blade 300 to run to a preset safe position. Wherein, the master driver failure information and the slave driver failure information can be set according to actual conditions, for example, only feathering instruction, or detailed failure information including failure type and failure time.

[0071] Specifically, in combination with Figures 2-4 Taking the number of variable pitch drivers 10 as two for example, referring to Figure 2 One is the master variable pitch driver 11, and the other is the slave variable pitch driver 12, Figure 3 , 4 is a running control timing diagram of the master and slave variable pitch drivers 12. Figure 3 Taking the master variable pitch driver 11 as always being in a normal working state without failure and the slave variable pitch driver 12 as being in failure for a period of time for example; after receiving the control signal sent by the wind turbine controller 100, the master variable pitch driver 11 starts to drive the corresponding motor 20 to run; after a delay time t2-t1, the slave variable pitch driver 12 receives the control signal sent by the master variable pitch driver 11, and the slave variable pitch driver 12 follows the master variable pitch driver 11 to run; wherein the delay time t2-t1 is the delay time of the slave variable pitch driver 12 to receive the signal, which is generally in millisecond level. In this stage, the master and slave variable pitch drivers 12 are both in a normal working state, and jointly control the corresponding motor 20 to drive the blade 300 to run. Since there are two drivers to jointly drive the blade 300 to run, the variable pitch driving power is greatly increased, which is sufficient to meet the high power requirement of offshore wind turbines; and the two motors 20 jointly drive the whole blade 300 to run through the hub gear 200, which shares the stress of the hub gear 200 when controlled by one motor 20, reduces the wear of the hub gear 200, and improves the safety of the wind turbine.

[0072] At the moment t3, a free parking failure occurs from the variable pitch driver 12, the variable pitch system is switched from the "master-slave operation" mode to the "master independent feathering", at this time even if the failure of the slave variable pitch driver 12 disappears, the slave variable pitch driver 12 will not follow the master variable pitch driver 11 again until the master variable pitch driver 11 completes the feathering, and then receives the operation signal again, the slave variable pitch driver 12 can follow the master variable pitch driver 11 again. It should be noted that if the master variable pitch driver 11 fails at this stage, the slave variable pitch driver 12 will independently complete the feathering.

[0073] Referring to Figure 4 , Figure 4 In the master variable pitch driver 11 fails as an example, after the master variable pitch driver 11 receives the feathering command of the wind turbine controller 100, the master variable pitch driver 11 controls the slave variable pitch driver 12 to feather together, in the feathering process, if the master variable pitch driver 11 appears feathering abnormality (or free parking) for more than a specified time, the master variable pitch driver 11 enters the free parking state, and the slave variable pitch driver 12 independently completes the feathering; after the slave variable pitch driver 12 completes the feathering, and the master variable pitch driver 11 has no failure, at this time there is a feathering command, the master and slave again enter synchronous feathering, and after the feathering is completed, both are parked together. Through the redundant connection design of the two variable pitch drivers, the safety of the variable pitch driving system is greatly improved.

[0074] In the embodiment, when any one of the variable pitch drivers 10 fails, the remaining variable pitch drivers 10 in the normal working state can receive the corresponding fault information and drive the blades 300 to operate to the safe position, and after the feathering is completed, the wind turbine is in the safe state, and the stress abrasion of the hub gear 200 is reduced, thereby improving the safety of the wind turbine system.

[0075] In an embodiment, the master variable pitch driver 11 is further configured to generate a corresponding driving signal to drive the corresponding motor 20 to operate when receiving the control signal output by the wind turbine controller 100, and send the control signal to the slave variable pitch driver 12, so that the slave variable pitch driver 12 generates a corresponding driving signal to drive the corresponding motor 20 to operate, to jointly drive the blade 300 to operate.

[0076] When each variable pitch driver 10 is in the normal working state, the master variable pitch driver 11 receives the operation command or the feathering command of the wind turbine controller 100, controls the corresponding motor 20 to operate, and sends the command to the slave variable pitch driver 12, so that the slave variable pitch driver 12 controls the corresponding motor 20 to operate, so that the master and slave variable pitch drivers 12 act cooperatively to jointly drive the blade 300 to operate. Through the multiple variable pitch drivers 10 jointly driving the blade 300 to operate, the power of the variable pitch system is greatly increased, which is sufficient to meet the high-power requirement of the offshore wind turbine.

[0077] In an embodiment, the multi-drive variable pitch system comprises a safety chain feedback circuit; the controlled end of the safety chain feedback circuit is connected with the safety signal output end of each of the plurality of variable pitch drives 10, and the output end of the safety chain feedback circuit is connected with the safety signal input end of each of the plurality of variable pitch drives 10; when any one of the plurality of variable pitch drives 10 fails, the safety chain feedback circuit returns a safety chain disconnection signal to the remaining variable pitch drives 10, so that the remaining variable pitch drives 10 drive the corresponding motor 20 to drive the hub gear 200 to operate, and drive the blade 300 to operate to a preset safety position.

[0078] The safety chain feedback circuit can comprise a plurality of safety relays and a plurality of safety chain input terminals; the control coils of the plurality of safety relays are connected in series in a first power circuit, the safety signal output ends of the plurality of variable pitch drives 10 are connected in the first power circuit, the plurality of safety chain input terminals and the contacts of the plurality of safety relays are connected in series in a second power circuit; the plurality of safety chain input terminals are connected one by one with the safety signal input ends of the plurality of variable pitch drives 10; when any one of the plurality of variable pitch drives 10 fails, the first power circuit is disconnected, so that the plurality of safety relays control the second power circuit to be disconnected, and the plurality of safety chain input terminals return a safety chain disconnection signal to the remaining variable pitch drives 10.

[0079] It can be understood that the unit safety protection system, also known as the safety chain, is the highest level of protection measure to ensure the safety of the wind turbine, mainly composed of a reset button, a grid-connected contactor, a main circuit breaker, a generator overspeed module, an impeller overspeed module, a vibration switch, a variable pitch cabinet emergency stop button, a main control cabinet (tower bottom cabinet) emergency stop switch, a cabin emergency stop switch and other nodes, connected in series to the safety relay in the main control cabinet. The safety relay is the core component of the unit safety chain and is the actuator of the safety chain. After the unit is powered on, in the normal state, the entire safety chain is powered with 24V. If a component of the unit fails, the node corresponding to the component is disconnected, and the safety chain loses power.

[0080] All the input nodes on the above-mentioned safety chain of the wind turbine are connected in series to the plurality of safety chain input terminals, and the plurality of safety chain input terminals are connected in series in the second power circuit, and the second power circuit is controlled by the first power circuit.

[0081] Reference Figure 5For example, in a multi-drive variable pitch system including two variable pitch drives 10, the first power circuit and the second power circuit are both 24V power circuits, the safety chain feedback circuit can include a plurality of safety relays and a plurality of safety chain input terminals (not shown); the control coils (R) of the plurality of safety relays are connected in series in the first power circuit, the safety signal output terminals (SCR1.1, SCR1.2) of the plurality of variable pitch drives 10 are respectively connected in the first power circuit to control the on-off of the first power circuit, and the plurality of safety chain input terminals are connected one by one with the safety signal input terminals (SCI1.1, SCI1.2) of the plurality of variable pitch drives 10.

[0082] When the two variable pitch drives 10 are in a normal working state, the corresponding two safety relays are both closed, the first power circuit is closed, and the two safety chain input terminals are both connected with 0V and 24V to respectively feed back the input signals of the two closed safety chains to the safety signal input terminals (SCI1.1, SCI1.2) of the two variable pitch drives 10; if one of the variable pitch drives 10 fails, the first power circuit will be disconnected through SCR1.1 and / or SCR1.2, so that the control coil (R) of the safety relay is powered off, the contact is disconnected, the second power circuit is disconnected, and the connection of the two safety chain input terminals with 0V is disconnected, at this time, the safety chain disconnection signal is fed back to the variable pitch drive 10 in the normal working state, so that the variable pitch drive 10 in the normal working state is feathered and the blade 300 is operated to a preset safe position.

[0083] By respectively setting the safety signal output terminals and the safety signal input terminals of the plurality of variable pitch drives 10, when one of the variable pitch drives 10 fails, the remaining variable pitch drives 10 can still receive the safety chain disconnection signal and trigger feathering. Therefore, by redundantly setting the variable pitch drive 10 and the safety chain signal input and output terminals, the safety of the variable pitch system is improved.

[0084] It should be noted that there are mainly three triggering modes for feathering, the first mode is that when the variable pitch drive 10 detects that it has an abnormality, the corresponding safety relay is disconnected through the output terminals SCR1.1, SCR1.2, so that the input terminals SCI1.1, SCI1.2 of the variable pitch drive 10 in the normal working state receive the safety chain disconnection signal, i.e. triggering feathering; the second mode is that when the fan controller 100 finds that the system is abnormal, the variable pitch drive 10 is controlled to disconnect the safety relay through the output signal SCR1.1, SCR1.2, so that the input terminals SCI1.1, SCI1.2 of the variable pitch drive 10 receive the safety chain disconnection signal, i.e. triggering feathering; the third mode is that when the fan controller 100 detects that the system is abnormal, it directly issues a feathering command to trigger feathering of each variable pitch drive 10. By triggering feathering in multiple ways, the safety of the fan system is further ensured.

[0085] In an embodiment, the multi-drive variable pitch system further comprises a limit switch, each of the variable pitch drives 10 comprises a limit signal input end for connecting with the limit switch; the limit switch is configured to output a limit signal to the limit signal input end when the blade 300 runs to the preset safe position; and the plurality of variable pitch drives 10 are configured to control the corresponding motor 20 to stop running according to the limit signal.

[0086] In this embodiment, when the blade 300 runs to the preset safe position, i.e. the limit position, the limit switch is triggered, and the limit switch feeds back a limit signal to the variable pitch drive 10. After receiving the limit signal, the variable pitch drive 10 stops running and completes the feathering. After the feathering is completed, the entire wind turbine is in a safe state, and even if extreme weather conditions such as strong wind occur, the wind turbine will not be blown down.

[0087] Referring again to Figure 5 , the limit signal input end of the variable pitch drive 10 can include input ends LS1 and LS2, corresponding to 91 degrees and 95 degrees, corresponding to two angles of the blade 300. The 91 degrees is the first line of defense, and the 95 degrees is the last line of defense, which is a redundant design of the wind turbine, further ensuring the safety of the wind turbine system.

[0088] In an embodiment, each of the variable pitch drives 10 comprises an emergency stop signal input end; the emergency stop signal input end is configured to receive an emergency stop signal output by the wind turbine controller 100; and the plurality of variable pitch drives 10 are configured to control the corresponding motor 20 to stop running according to the emergency stop signal.

[0089] Referring again to Figure 5 , both of the variable pitch drives 10 comprise an emergency stop signal input end Enpo; the emergency stop signal input end Enpo can be connected with the wind turbine controller 100, and is configured to receive an emergency stop signal output by the wind turbine controller 100.

[0090] In this embodiment, when the wind turbine controller 100 detects an abnormal situation or needs to control emergency stop, it will output an emergency stop signal. By providing an emergency stop input end in each variable pitch drive 10, each variable pitch drive 10 can timely receive the signal. If one variable pitch drive 10 does not receive the signal, the remaining variable pitch drives 10 can communicate with each other, and the variable pitch drive 10 that receives the signal can also timely send the signal to the remaining variable pitch drives 10, so that each variable pitch drive 10 can trigger the emergency stop.

[0091] Thus, each pitch drive 10 includes a safety signal input, a safety signal output, a limit signal input, and an ENPO signal input, further realizing redundant setting of key signals and ensuring system safety.

[0092] In an embodiment, each pitch drive 10 includes a drive circuit and a brake control module, a signal end of the drive circuit is connected to the wind turbine controller 100, a brake signal output end of the drive circuit is connected to an input end of the brake control module, an output end of the brake control module is connected to a corresponding motor 20, and output ends of brake control modules of multiple pitch drives 10 are connected; the drive circuit is configured to generate a brake control signal according to a control signal output by the wind turbine controller 100 to control the corresponding motor 20 to be braked or unbraked; when any one brake control module of the multiple pitch drives 10 controls the corresponding motor 20 to be braked, and the remaining brake control modules control the corresponding motors 20 to be unbraked, at least one brake control module of the remaining brake control modules controls the motor 20 to be unbraked, and the hub gear 200 controls the blade 300 to operate.

[0093] In the embodiment, each pitch drive 10 includes a drive circuit and a brake control module, the drive circuit can include a communication module and a drive module, etc., the communication module is configured to be connected to the wind turbine controller 100 in CAN communication, the drive module is configured to generate a corresponding drive signal according to a control signal output by the wind turbine controller 100 and drive the corresponding motor 20, and the brake control module is configured to control the corresponding motor 20 to be braked. It can be understood that the motor 20 has an internally integrated brake device, the brake device includes a brake coil, when the brake coil is powered, the motor 20 is unbraked to operate, and when the brake coil is powered off, the brake is braked. The structure of the brake control module is not limited, and can be set according to common techniques in the art, for example, a 24V direct current signal output module, the pitch drive 10 outputs a 24V direct current signal to the brake coil of the corresponding motor 20, when the output signal, the motor 20 is unbraked, and when there is no output, the motor 20 is in a braked state.

[0094] In combination with Figures 5-7 , the brake synchronous control timing sequence is shown in Figure 6 and Figure 7 , still taking the example of the master pitch drive 11 and the slave pitch drive 12. As shown in Figure 6, the master variable pitch driver 11 receives the operation command, and starts the corresponding motor 20 to open the brake. The slave variable pitch driver 12 follows the master variable pitch driver 11 to start the corresponding motor 20 after a delay of t1. Since the brake hardware of the master and slave variable pitch drivers are connected in parallel, the delay t1 has no effect on the motor 20. When the master variable pitch driver 11 receives the stop command, it starts to slow down the corresponding motor 20 to stop. When the operation frequency is lower than the set value, the master variable pitch driver 11 starts to control the motor 20 to brake. Meanwhile, the motor 20 of the slave variable pitch driver 12 enters the brake state after a delay of t5-t4, and the motor 20 of the master variable pitch driver 11 enters the brake state at the same time. After the brake delay, the motor 20 of the master variable pitch driver 11 stops. The motor 20 of the slave variable pitch driver 12 stops after a delay of t7-t6. In this way, the master and slave variable pitch drivers 12 are controlled synchronously by the brake, and the synchronous opening and closing of the brake are realized. Figure 7 When the motor 20 of the master variable pitch driver 11 receives the free parking command, the motor 20 immediately brakes. The motor 20 of the slave variable pitch driver 12 brakes after a delay of t4-t3. The delay time is controlled within 10 ms, which can avoid the situation that the two motors 20 cannot lock the blade 300 when they brake separately.

[0095] In this embodiment, since the brake control modules are connected in parallel, when one variable pitch driver 10 or one brake control module fails, the corresponding motor 20 will brake, but the 24V DC signal output by the remaining brake control modules can still be applied to the brake coil of the motor 20, so that the motor 20 can operate with the brake open. The remaining motors 20 can still drive the motor 20 to operate through the hub gear 200, so that the blade 300 can be moved to a safe position, thereby completing feathering together and ensuring the safety of the wind turbine.

[0096] In an embodiment, the multi-drive variable pitch system includes a plurality of energy storage devices, each variable pitch driver 10 includes a drive circuit and a charging machine; the signal end of the drive circuit is connected with the wind turbine controller 100, the charging signal output end of the drive circuit is connected with the input end of the charging machine, the output end of the charging machine is connected with a plurality of energy storage devices respectively, and the output ends of the charging machines are connected; the drive circuit is used for generating a charging signal according to the control signal output by the wind turbine controller 100, so as to control the corresponding charging machine to charge the corresponding energy storage device; when any charging machine of the plurality of variable pitch drivers 10 fails, the remaining charging machines charge the plurality of energy storage devices. When any charging machine of the plurality of variable pitch drivers 10 fails, the remaining charging machines complete the charging of the plurality of energy storage devices.

[0097] It can be understood that when the wind turbine encounters grid voltage drop and the like, the energy storage device supplies power for the multi-drive variable pitch system, so that the system can complete the feathering operation. In the embodiment, the energy storage device can be a super capacitor, specifically a single super capacitor or a plurality of super capacitors connected in series, and the capacity thereof needs to meet the standby requirement of the system.

[0098] The charging machine control timing is as shown in Figure 8 The charging machine in the main variable pitch drive is the main charging machine, and the motor 20 in the slave variable pitch drive 12 is the slave charging machine. After the main variable pitch drive 11 receives the charging command output by the wind turbine controller 100, the main charging machine is started, and a start command is sent to the slave charging machine through CAN communication. The slave charging machine starts running after a t1 delay. Before the constant voltage stage, the main and slave charging machines jointly charge the two super capacitors. Before the constant voltage stage, the slave charging machine exits the charging, and the main charging machine independently charges. After the main charging machine completes the charging, it enters the floating charging stage. After the charging command is cancelled, the main charging machine is closed.

[0099] In addition, when the main charging machine fails, the main charging machine stops working, and the slave charging machine independently completes the charging until the slave charging machine enters the floating charging stage. After the slave charging machine enters the floating charging stage, the main charging machine is fault-free, and the control timing shown in Figure 8 is entered again. Otherwise, the slave charging machine continues to charge the two super capacitors. If the slave charging machine fails, the main charging machine independently completes the charging, and the process is the same as when the main charging machine fails, and will not be repeated here.

[0100] In the embodiment, through the backup setting of the charging machine, when the drive circuit or the charging machine in any one variable pitch drive 10 fails, the other charging machine can still complete the charging, so as to ensure that the electrical energy stored in the standby energy storage device of the system is sufficient, enhance the emergency response ability of the system in case of sudden situations, and enhance the reliability of the system.

[0101] In an embodiment, refer to Figure 9Each of the variable pitch drives 10 comprises a drive chip 102 and a communication chip 101, signal ends of the communication chip 101 are connected with the wind turbine controller 100 respectively, and a communication end of the communication chip 101 is connected with a communication end of the drive chip 102; the drive chip 102 comprises a safety signal output end and a safety signal input end; a controlled end of the safety chain feedback circuit is connected with the safety signal output end of the drive chip 102, and an output end of the safety chain feedback circuit is connected with the safety signal input end of the drive chip 102; when the drive chip 102 / communication chip 101 in any one of the variable pitch drives fails, the plurality of drive chips 102 can trigger the safety chain feedback circuit to return a safety chain disconnection signal to the drive chips 102 in the remaining variable pitch drives, so that the remaining drive chips 102 drive the corresponding motors to drive the hub gear to operate, and drive the blades to operate to the preset safety position.

[0102] In the embodiment, the communication chip 101 can be a built-in PLC of the drive, and the drive chip 102 can be a frequency converter drive chip. By arranging the safety signal input end and the safety signal output end in the drive chip 102 and connecting the safety signal input end and the safety signal output end with the safety chain feedback circuit, the redundancy of the safety chain terminal is increased, and the system safety is further ensured.

[0103] In an embodiment, the multi-drive variable pitch system further comprises a limit switch, the drive chip 102 further has a limit signal input end, the limit signal input end is used for being connected with the limit switch, the limit switch is used for outputting a limit signal to the limit signal input end when the blade 300 operates to the preset safety position, and the plurality of drive chips 102 are used for controlling the corresponding motors 20 to stop operating according to the limit signal. The drive chip 102 has an emergency stop signal input end, the emergency stop signal input end is used for receiving an emergency stop signal output by the wind turbine controller 100, and the plurality of drive chips 102 are used for controlling the corresponding motors 20 to stop operating according to the emergency stop signal. Thus, the limit signal input end and the emergency stop signal input end are respectively arranged in the drive chip 102, the operation of each variable pitch drive 10 is ensured, and the system is more safe.

[0104] The application further provides a wind turbine, which comprises a wind turbine controller 100, a blade 300 and a multi-drive variable pitch system. The structure of the three groups of multi-drive variable pitch systems can refer to the above-mentioned embodiments, and will not be described here again. Naturally, since the wind turbine system of the embodiment adopts the technical scheme of the above-mentioned multi-drive variable pitch system, the wind turbine has all the beneficial effects of the multi-drive variable pitch system.

[0105] In an embodiment, the number of the plurality of drive variable pitch systems and the plurality of blades 300 is multiple. The number of the plurality of drive variable pitch systems and the plurality of blades 300 can be set according to actual needs, such as three groups of blades 300 and three groups of the plurality of drive variable pitch systems; each of the plurality of drive variable pitch systems is used to drive a group of the plurality of blades 300 to operate according to the control of the wind turbine controller 100; thereby realizing the safe control of the entire wind turbine.

[0106] In an embodiment, each of the plurality of drive variable pitch systems comprises a safety chain feedback circuit; the controlled end of the safety chain feedback circuit is connected with the safety signal output end of each of the plurality of variable pitch drives 10 in the plurality of drive variable pitch systems, and the output end of the safety chain feedback circuit is connected with the safety signal input end of the plurality of variable pitch drives 10 in each of the plurality of drive variable pitch systems; when any one of the plurality of variable pitch drives 10 fails, the safety chain feedback circuit of the plurality of variable pitch drives 10 in the plurality of drive variable pitch systems can return a safety chain disconnection signal to the remaining variable pitch drives 10, so that the remaining variable pitch drives 10 drive the corresponding motor 20 to drive the hub gear 200 to operate, and drive the corresponding blade 300 to operate to a preset safe position.

[0107] The safety chain feedback circuit can refer to the above-mentioned embodiments, and the difference is that each safety chain input terminal in the plurality of drive variable pitch systems can be arranged in the second power circuit, the second safety circuit is still controlled by the first power circuit, and the first power circuit is controlled by each of the variable pitch drives 10, so that when any one of the variable pitch drives 10 fails, the remaining variable pitch drives 10 in the wind turbine can receive the safety chain disconnection signal, and timely feathering to ensure the safety of the wind turbine.

[0108] The above is only an optional embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent flow transformation obtained by utilizing the content of the specification and the drawings of the present application, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A multi-drive variable pitch system, used to drive blades according to the control of a wind turbine controller, characterized in that: include: Multiple motors for driving the hub gears; Multiple pitch drives, the signal ends of the multiple pitch drives are respectively connected to the wind turbine controller, and the output ends of the multiple pitch drives are connected to the multiple motors in a one-to-one correspondence; each pitch drive is used to generate a corresponding drive signal according to the control signal output by the wind turbine controller and drive the corresponding motor to drive the hub gear to operate, so as to drive the blades to operate; wherein, When any one of the plurality of pitch drives fails, the plurality of pitch drives can trigger the remaining pitch drives to drive the corresponding motors to drive the hub gear to operate, so as to drive the blades to a preset safe position.

2. The multi-drive pitch system according to claim 1, characterized in that: One of the plurality of pitch drives is a master pitch drive, and the remaining pitch drives are slave pitch drives; a communication end of the master pitch drive is connected to a communication end of the slave pitch drives; The master pitch drive is configured to transmit master drive fault information to the slave pitch drive when the master pitch drive fails, so that the slave pitch drive drives the blade to a preset safe position; It is also used to generate a corresponding drive signal to drive the corresponding motor to operate when receiving the slave drive fault information outputted from the slave pitch drive fault, and transmit the slave drive fault information to the remaining slave pitch drives, so that the remaining slave pitch drives drive the corresponding motors to operate, so as to jointly drive the blades to a preset safe position.

3. The multi-drive pitch system according to claim 2, characterized in that: The master pitch driver is also used to generate a corresponding drive signal to drive the corresponding motor to operate when receiving a control signal output by the wind turbine controller, and send the control signal to the slave pitch driver, so that the slave pitch driver generates a corresponding drive signal to drive the corresponding motor to operate, thereby jointly driving the blades to operate.

4. The multi-drive pitch system according to claim 1, characterized in that: The multi-drive pitch system includes a safety chain feedback circuit; the controlled end of the safety chain feedback circuit is respectively connected to the safety signal output ends of the plurality of pitch drives, and the output end of the safety chain feedback circuit is respectively connected to the safety signal input ends of the plurality of pitch drives; When any one of the multiple pitch drives fails, the multiple pitch drives can trigger the safety chain feedback circuit to return a safety chain disconnection signal to the remaining pitch drives, so that the remaining pitch drives drive the corresponding motors to drive the hub gear to operate and drive the blades to a preset safe position.

5. The multi-drive pitch system according to claim 1, characterized in that: The multi-drive pitch system further includes a limit switch, and each of the pitch drives includes a limit signal input terminal, and the limit signal input terminal is used to connect to the limit switch; The limit switch is used to output a limit signal to the limit signal input terminal when the blade moves to the preset safety position; The plurality of pitch drivers are used to control corresponding motors to stop running according to the limit signal.

6. The multi-drive pitch system according to claim 1, characterized in that: Each of the pitch drive devices includes an emergency stop signal input terminal; The emergency stop signal input terminal is used to receive the emergency stop signal output by the fan controller; The plurality of pitch drives are used to control the corresponding motors to stop running according to the emergency stop signal.

7. The multi-drive pitch system according to claim 1, characterized in that: Each of the pitch drives includes a drive circuit and a brake control module, the signal end of the drive circuit is connected to the wind turbine controller, the brake signal output end of the drive circuit is connected to the input end of the brake control module, the output end of the brake control module is connected to the corresponding motor, and the output ends of the brake control modules of the multiple pitch drives are connected; The drive circuit is used to generate a brake control signal according to the control signal output by the fan controller to control the corresponding motor to open / close the brake; When any one brake control module in the multiple pitch drives controls the corresponding motor brake and the remaining brake control modules control the corresponding motor unlocking, at least one of the remaining brake control modules unlocks the brake motor and controls the operation of the blades with the hub gear.

8. The multi-drive pitch system according to claim 1, wherein: The multi-drive pitch system includes multiple energy storage devices, and each pitch drive includes a drive circuit and a charger; the signal end of the drive circuit is connected to the wind turbine controller, the charging signal output end of the drive circuit is connected to the input end of the charger, and the output end of the charger is respectively connected to the multiple energy storage devices, and the output end of the charger is connected; The driving circuit is used to generate a charging signal according to the control signal output by the wind turbine controller to control the corresponding charger to charge the corresponding energy storage device; When any one charger of the plurality of pitch drives fails, the remaining chargers charge the plurality of energy storage devices.

9. A fan, characterized in that: The invention comprises a wind turbine controller, blades and a multi-drive variable pitch system according to any one of claims 1 to 8.

10. The fan according to claim 9, characterized in that The multi-drive variable pitch system and the number of blades are both multiple.

11. The fan according to claim 10, wherein: Each of the multi-drive pitch systems includes a safety chain feedback circuit; a controlled end of the safety chain feedback circuit is respectively connected to a safety signal output end of each of the pitch drives in the plurality of multi-drive pitch systems, and an output end of the safety chain feedback circuit is respectively connected to a safety signal input end of the plurality of pitch drives in each of the multi-drive pitch systems; The multiple pitch drives in the multiple-drive pitch systems can trigger the safety chain feedback circuit to return a safety chain disconnection signal to the remaining pitch drives when any one of the pitch drives fails, so that the remaining pitch drives drive the corresponding motors to drive the hub gears to operate and drive the corresponding blades to run to a preset safety position.

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