CN113446154A - Variable pitch control method and control system of wind generating set - Google Patents
Variable pitch control method and control system of wind generating set Download PDFInfo
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- CN113446154A CN113446154A CN202010227905.8A CN202010227905A CN113446154A CN 113446154 A CN113446154 A CN 113446154A CN 202010227905 A CN202010227905 A CN 202010227905A CN 113446154 A CN113446154 A CN 113446154A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/022—Adjusting aerodynamic properties of the blades
- F03D7/0236—Adjusting aerodynamic properties of the blades by changing the active surface of the wind engaging parts, e.g. reefing or furling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/04—Automatic control; Regulation
- F03D7/042—Automatic control; Regulation by means of an electrical or electronic controller
- F03D7/043—Automatic control; Regulation by means of an electrical or electronic controller characterised by the type of control logic
- F03D7/044—Automatic control; Regulation by means of an electrical or electronic controller characterised by the type of control logic with PID control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Wind Motors (AREA)
Abstract
The disclosure provides a variable pitch control method and a variable pitch control system of a wind generating set. The pitch control method comprises the following steps: determining whether a single-shaft communication fault occurs in the wind generating set by a master control controller of the wind generating set, wherein the single-shaft communication fault is a communication fault between the master control controller and one variable pitch controller of the wind generating set caused by a slip ring fault between the master control controller and the variable pitch controller; after the wind generating set is determined to have single-shaft communication failure, a main control system of the wind generating set and a variable pitch system corresponding to a variable pitch controller having the single-shaft communication failure enter a redundant operation mode; in a redundant operation mode, keeping a safety chain of the wind generating set closed by a main control system and controlling a level signal of the safety chain of the wind generating set by a main control controller according to the variable pitch speed output by the PID controller; and executing corresponding blade adjusting operation by the blade adjusting system according to the change of the level signal.
Description
Technical Field
The disclosure relates to the technical field of wind power generation, in particular to a variable pitch control method and a variable pitch control system of a wind generating set.
Background
The wind generating set is a device for converting wind energy into electric energy, and the wind energy drives a moving shaft and a generator to be converted into electric energy through an impeller.
The conductive slip ring is a precise power transmission device which transmits electric signals and electric energy between a rotating part and a rolling or sliding part of a fixed seat frame by utilizing sliding contact, electrostatic coupling or electromagnetic coupling of a conductive ring. It is widely used in all electromechanical systems that require unlimited, continuous or intermittent 360 degree rotation, providing multi-channel rotational power, data and signals. The conducting slip ring greatly simplifies the system structure and avoids the sprain of the lead in the rotating process. The conductive slip ring component is composed of a slip ring body, an electric brush component, a fixed support, a concentric ball bearing and other important parts. The conductive slip ring is required to ensure reliable contact in structural design and ensure continuous connection of all lines.
In the wind generating set, because the variable pitch system is arranged in the hub and rotates along with the impeller, the cabin is fixed, and the main control system is arranged in the cabin, the conductive slip ring is one of indispensable parts in the wind driven generator. However, since the conductive slip ring transmits dozens of different electrical signals, for example, high-frequency alternating current, high-voltage alternating current, large-current alternating current, and weak-small direct current, and the distance between the conductive slip ring rings is very short, various signals interfere with each other during transmission, thereby seriously affecting information transmission.
Fig. 1 shows a control logic diagram between a main control system and a pitch system of a wind park. Referring to fig. 1, a main control system (not shown) compares an actual rotating speed value of a generator with a preset rotating speed set value, performs PID calculation by using a PID controller 104, and sends a required speed command to a pitch controller 101 of a pitch system through a conductive slip ring 106; the variable pitch controller 101 sends the required variable pitch speed and the enabling signal to the variable pitch driver 102 according to the received speed command, and after receiving the enabling signal and the variable pitch speed, the variable pitch driver 102 controls the variable pitch motor 103 to brake and release and drives the variable pitch motor 103 to operate, so that the blade adjusting function is realized. The rotary encoder 105 feeds back the angle measured according to the absolute value signal to the pitch controller 101 and the speed measured according to the incremental signal to the pitch drive 102. In addition, pitch controller 101 feeds back the angle received from rotary encoder 105 to GH controller 104 through slip ring 106. When the speed command is 0, the pitch drive 102 controls the brake of the pitch motor.
However, as can be seen from fig. 1, if the pitch controller 101 needs to control the operation of the pitch driver 102 and make the pitch driver 102 drive the pitch motor 103 to operate, it needs to send a speed command and an enable signal at the same time, once the communication between the pitch controller 101 and the main control controller is interrupted, both the speed command and the enable signal become 0 or have no output value, and at this time, the pitch driver 102 cannot perform normal pitch control any more because it cannot receive the operation command.
At present, for communication faults caused by interference of a conductive slip ring, a wind generating set can only be ensured to be safe by adopting a stopping operation, namely, after a master control system detects that communication of the conductive slip ring is wrong, a propeller retracting machine can be immediately executed to stop so as to ensure the safety of the wind generating set, but the wind generating set can be caused to be unnecessarily stopped to influence the generating capacity of the wind generating set.
Disclosure of Invention
Exemplary embodiments of the present disclosure provide a control method of a wind turbine generator set and a control system thereof, which solve at least the above technical problems and other technical problems not mentioned above, and provide the following advantageous effects.
An aspect of the present disclosure is to provide a control method of a wind turbine generator system, which may include: determining whether a single-shaft communication fault occurs in the wind generating set by a master control controller of the wind generating set, wherein the single-shaft communication fault is a communication fault between the master control controller and one variable pitch controller of the wind generating set caused by a slip ring fault between the master control controller and the variable pitch controller; after the wind generating set is determined to have single-shaft communication failure, a main control system of the wind generating set and a variable pitch system corresponding to a variable pitch controller having the single-shaft communication failure enter a redundant operation mode; in a redundant operation mode, keeping a safety chain of the wind generating set closed by a main control system and controlling a level signal of the safety chain of the wind generating set by a main control controller according to the variable pitch speed output by the PID controller; performing, by the pitch system, a respective pitching operation as a function of the level signal, wherein the safety chain may comprise at least one external safety chain.
Another aspect of the present disclosure is to provide a control system of a wind turbine generator system, which may include: the master control system comprises a master control controller; at least one pitch system comprising at least one pitch controller; a slip ring comprising a plurality of communication channels respectively connecting the master controller with each of the at least one pitch controller for data communication; and at least one external safety chain. The method comprises the steps that a master control controller determines whether a single-shaft communication fault occurs in a wind generating set, the single-shaft communication fault is caused between the master control controller and one variable pitch controller in at least one variable pitch system due to the fact that a slip ring between the master control controller and the one variable pitch controller fails, after the wind generating set is determined to have the single-shaft communication fault, the master control system and the variable pitch system corresponding to the variable pitch controller with the single-shaft communication fault enter a redundancy operation mode, in the redundancy operation mode, the master control system keeps at least one external safety chain closed, the master control controller controls a level signal of the at least one safety chain according to the variable pitch speed output by a PID (proportion integration differentiation) controller, and the variable pitch system executes corresponding pitch adjusting operation according to the change of the level signal.
Another aspect of the present disclosure is to provide a control apparatus of a wind turbine generator set, which may include a determination module and a control module. The determining module can determine whether a single-shaft communication fault occurs in the wind generating set by using a master control controller of the wind generating set, wherein the single-shaft communication fault is a communication fault between the master control controller and one pitch controller of the wind generating set caused by a slip ring fault between the master control controller and the pitch controller. The control module can control a main control system of the wind generating set and a variable pitch system corresponding to a variable pitch controller with the single-shaft communication fault to enter a redundant operation mode after the wind generating set is determined to have the single-shaft communication fault, and under the redundant operation mode, the main control system is controlled to keep a safety chain of the wind generating set closed, a level signal of the safety chain of the wind generating set is controlled by the main control controller according to the variable pitch speed output by the PID controller, and the variable pitch system is controlled to execute corresponding variable pitch operation according to the change of the level signal. Wherein the safety chain may comprise at least one external safety chain.
According to another exemplary embodiment of the present disclosure, a computer-readable storage medium is provided, in which a computer program is stored, which, when being executed by a processor, carries out the method of controlling a wind park as described above.
According to another exemplary embodiment of the present disclosure, a computer is provided, comprising a readable medium having a computer program stored thereon and a processor, characterized in that the processor, when running the computer program, performs the control method of the wind park as described above.
The method, the system and the device can control the pitch adjustment direction of the wind driven generator through the type of the level signal of the safety chain hardware during the redundant operation when communication faults occur, avoid the problem that the angle is inconsistent due to the pitch adjustment control of the blades is triggered immediately, realize longer redundant time and effectively carry out DP communication flash fault-tolerant control. In addition, the current pitch adjusting direction of the wind generating set can be accurately distinguished, so that the redundant operation of the wind generating set is realized, and the safety of the wind generating set can be ensured.
Additional aspects and/or advantages of the present general inventive concept will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the general inventive concept.
Drawings
These and/or other aspects and advantages of the present disclosure will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a control logic diagram between a main control system and a pitch system of a wind power plant;
FIG. 2 is a schematic view of a control system of a wind park according to an exemplary embodiment of the present disclosure;
FIG. 3 is a flow chart of a control method of a wind park according to an exemplary embodiment of the present disclosure;
FIG. 4 is a flow chart of a control method of a wind park according to another exemplary embodiment of the present disclosure;
FIG. 5 is a schematic view of a control system of a wind park according to another exemplary embodiment of the present disclosure;
fig. 6 is a block diagram of a control arrangement of a wind park according to an exemplary embodiment of the present disclosure.
Detailed Description
The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of the embodiments of the disclosure as defined by the claims and their equivalents. Various specific details are included to aid understanding, but these are to be considered exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
The terms "first", "second", and the like in the present disclosure are only used for distinguishing different devices, modules, or units, and are not used for limiting the order or interdependence relationship of the functions performed by the devices, modules, or units.
Because the communication data is sensitive digital quantity signals, the interference of the conductive slip ring easily influences the stability and reliability of the communication data, and the operation of the pitch control system controlled by the main control system of the wind generating set is mainly realized through the communication of the conductive slip ring, so that the wind generating set often has the phenomenon that the communication is interrupted (namely the communication is recovered to be normal after being interrupted for a short time (for example, 1 s)) due to the interference of the conductive slip ring, the wind generating set is stopped, or the pitch control controller receives wrong pitch angle instruction data due to the interference of the communication data, so that the pitch control system malfunctions.
At present, for communication faults caused by interference of a conductive slip ring, the safety of a wind generating set can be ensured only by stopping the wind generating set, and the communication faults mainly comprise the following reasons: the variable pitch system does not acquire a wind speed value, the current wind speed value cannot be judged, and the wind speed is transient, so that the variable pitch system cannot operate blindly after a flash failure occurs in communication, otherwise, the safety of the wind generating set is extremely easily damaged; the variable pitch system cannot detect the rotating speed value of the generator or the low-speed shaft, even if the main control system of some wind driven generators transmits the rotating speed value of the generator to the variable pitch system, data transmission is still carried out through the conductive slip ring, after the conductive slip ring has a flash-off phenomenon, the data cannot be effectively transmitted, at the moment, the variable pitch system cannot operate blindly, otherwise, the safety of the wind driven generator set is extremely easily damaged; by means of communication data verification, misoperation of the variable pitch system can be effectively prevented, but the fault-tolerant function of slip ring flash cannot be realized, namely, after the variable pitch system detects that a verification result of communication data is wrong, the variable pitch system immediately executes pitch-retracting shutdown so as to ensure the safety of the wind generating set; even if the communication redundancy is considered by using the wireless communication, the wireless communication is easily shielded or interfered, more wireless modules are needed to be added, and the modification cost is higher; if the fault is not triggered and the fault tolerance of the wind driven generator is directly realized, the method has certain blindness and has greater hidden danger to the safety of the fan, and if the blades of the pitch control system in normal communication are in pitch control at the moment, the redundant operation time is very short, and the fault of inconsistent angle can be triggered quickly. Here, an "angle inconsistency" fault is a fault signal triggered by a pitch angle difference between individual blades of the wind park being larger than a fault threshold value over a certain time. For example, under the normal operation condition of the wind generating set, the deviation of the variable pitch speed value of each variable pitch system of the wind generating set is small, so that the difference value of the pitch angle of each blade is smaller than the fault threshold value of the "angle inconsistency" (generally 3.5 degrees/second) within a certain time. An "angle inconsistency" fault may be triggered if the pitch angle difference for each blade is greater than or equal to an "angle inconsistency" fault threshold.
For the above reasons, the present disclosure provides a control method and apparatus for resolving communication interruption. After the wind generating set has a single-shaft communication fault, the blade adjusting direction of the wind generating set is accurately distinguished through a level signal of an external safety chain, and redundant operation during communication interruption is realized, so that the fault rate and the shutdown frequency of the wind generating set are reduced, and the operation safety of the wind generating set can be ensured.
Hereinafter, according to various embodiments of the present disclosure, an apparatus and a method of the present disclosure will be described with reference to the accompanying drawings.
Fig. 2 is a schematic view of a control system of a wind park according to an exemplary embodiment of the present disclosure.
Referring to fig. 2, the control system 200 may comprise a main control system 201 of the wind park, a pitch system 202, an electrically conductive slip ring 203, and an inner safety chain 204 and two outer safety chains 205. Here, fig. 2 shows three pitch systems 202 of a wind park with three blades. The master control system 201 includes a master controller 206. Each pitch system 202 includes a pitch controller 207. Conductive slip ring 203 includes a plurality of communication channels, and master controller 206 is connected for data communication with each pitch controller 207 via one communication channel of conductive slip ring 203.
Internal safety chain 204 may include signal inputs, signal outputs, and contact switches of relays 13K4 corresponding to the number of pitch systems 202, each connected in series. Specifically, internal safety chain 204 is powered by a 24V power supply through a signal input, is connected in series with the contact switches of relays 13K4 of three pitch systems 202, and is then connected to digital input DI of master controller 206 via a signal output. The coil of each relay 13K4 is switched on and off by the corresponding pitch controller 207.
Both external safety chains 205 may comprise signal inputs, signal outputs, an emergency stop button 3S3, an overspeed switch 3S2, a vibration switch 3S1, and coils of relays corresponding to the number of pitch systems 202 (such as relay 18K9 in the first safety chain or relay 6K in the second safety chain), etc. Specifically, the two external safety chains 205 each output a 24V signal via the digital output DO of the main controller 206, and are connected in series with the emergency stop button 3S3, the over speed switch 3S2, the vibration switch 3S1, and the coil of the relay 18K9 or the relay 6K. The contact switches of relay 18K9 and relay 6K are each coupled to a digital input DI of the respective pitch controller 207.
The scram button 3S3, the overspeed switch 3S2, and the vibration switch 3S1 are normally connected to the relay 128K4, and are collectively detected by the relay 128K4, wherein any signal that changes from high to low will cause the external safety chain 205 to open.
The main control controller 206 may control the start, operation, and stop of the wind turbine generator system, and the main control controller 206 sends a pitch angle control instruction to each pitch controller 207, and each pitch controller 207 controls the blade to open and close after receiving the instruction sent by the main control controller 206 to achieve maximum power output and ensure operation at a stable rotation speed, and performs data interaction with the main control controller 206.
Under normal communication conditions, each pitch controller 207 controls the relay 13K4 in the respective pitch system 202 to pick up, and the internal safety chain 204 is in a closed state. When a communication fault occurs in one of the pitch controllers 207, the pitch controller 207 controls the corresponding relay 13K4 to be opened, so that the internal safety chain 204 is disconnected. After detecting that the internal safety chain 204 is disconnected, the master control controller 206 controls the external safety chain 205 to be disconnected through the relay 128K4, and after detecting that the external safety chain 205 is disconnected, the other pitch controllers 207 without communication faults trigger fault signals to synchronously receive the pitch with the pitch controllers 207 with communication faults. However, this may lead to unnecessary shutdown of the wind park, affecting the power production of the wind park. In the present disclosure, the reference numerals of the relays are for illustration and distinction only, and are not intended to limit the models of the relays.
According to embodiments of the present disclosure, the master controller 206 may determine whether a single-axis communication failure between the master controller 206 and one pitch controller 207 occurs in the wind park due to a slip ring failure between the master controller 206 and the pitch controller 207. After determining that the wind generating set has a single-shaft communication fault, the main control system 201 and the pitch system 202 corresponding to the pitch controller 207 having the single-shaft communication fault enter a redundant operation mode. In the redundant operation mode, the main control system 201 keeps the two outer safety chains 205 closed and the main control controller 206 controls the level signals of the two safety chains 205 according to the pitch speed output by the PID controller, and the pitch system 202 with the single-shaft communication failure performs the corresponding pitch adjusting operation according to the change of the level signals.
Both external safety chains 205 comprise relays corresponding to the number of pitch controllers of the wind park. Referring to fig. 2, a wind park with three blades has three pitch systems 202, each pitch system 202 comprising one pitch controller 207 and each external safety chain 205 comprising a relay corresponding to a pitch controller. For example, one external safety chain 205 includes three relays 18K9, and another external safety chain 205 includes three other relays 6K. However, the above examples are merely exemplary, and the present disclosure is not limited thereto. In the present disclosure, the reference numbers of the relays are only used for distinction and illustration, and the relays in the internal and external safety chains may be of the same model or different limit numbers.
The master controller 206 may set the level signals of the two external safety chains by determining whether the pitch speed output from the PID controller is a positive value, a negative value, or a zero value, so that a pitch system with a single-shaft communication failure may perform different pitch control operations according to the level signal variation of the two external safety chains 205.
As an example, when the pitch speed output from the PID controller is a positive value, the master controller 206 sets the level of the relay in the first of the two external safety chains 205 (here, the external safety chain including the relay numbered 6K may be referred to as the first safety chain) to a low level and sets the level of the relay in the second of the two external safety chains 205 (the external safety chain including the relay numbered 18K9 may be referred to as the second safety chain) to a high level. When the pitch speed output from the PID controller is a negative value, the master controller 206 sets the levels of the relays in the first safety chain and the second safety chain to a high level. When the pitch speed output from the PID controller is zero, the master controller 206 sets the level of the relay in the first safety chain to a high level and sets the level of the relay in the second safety chain to a low level. However, the above examples are only exemplary, and there is no specific requirement for the relationship between the positive and negative values of the pitch speed and the type of level of the safety chain.
When the pitch controller 207 with the single-shaft communication failure detects that the level of the relay in the first safety chain is low and the level of the relay in the second safety chain is high, the pitch controller 207 may control the pitch system 202 corresponding thereto to perform a pitch take-up operation at a predetermined speed. When it is detected that the level of the relay in the first safety chain is high and the level of the relay in the second safety chain is high, the pitch controller 207 may control the corresponding pitch system 202 to perform a pitching operation at a predetermined speed. When it is detected that the level of the relay in the first safety chain is high and the level of the relay in the second safety chain is low, the pitch controller 207 may control the respective pitch system 202 not to perform a pitching operation. Here, the predetermined speed may be set differently according to the operating conditions of the wind turbine generator set and the working experience of the designer.
In addition, when the master control system and the pitch system with the single-shaft communication failure are in the redundant operation mode, the master control controller 206 may monitor the rotation speed value of the wind turbine generator system in real time. When the monitored rotational speed value exceeds a preset value, the master control controller 206 may control the master control system 201 to disconnect the two outer safety chains 205 and trigger a fail-down. The running safety of the wind generating set is guaranteed by monitoring the rotating speed value of the generator.
When the redundant mode of operation expires, master controller 206 determines whether the single-axis communication failure is back to normal. If the single-axis communication failure is recovered to be normal, main control controller 206 controls main control system 201 and pitch system 202 with the single-axis communication failure to perform a normal operation mode. If the single-axis communication failure is not recovered, the master control controller 206 controls the master control system 201 to disconnect the two outer safety chains 205 and trigger a fail-stop, the wind turbine generator set performs emergency feathering, retracting the blades to a safe position.
When master control controller 206 determines that at least two single-shaft communication faults occur in the wind generating set, master control system 201 controls the wind generating set to stop.
Fig. 3 is a flow chart of a control method of a wind park according to an exemplary embodiment of the present disclosure.
Referring to fig. 3, in step S301, it is determined whether a single-axis communication fault occurs in the wind generating set by a master controller in a master control system of the wind generating set, where the single-axis communication fault is a communication fault between the master controller and one pitch controller due to a fault of a conductive slip ring between the master controller and the one pitch controller. And when the wind generating set is determined to have the single-shaft communication fault, performing step S302. And if the wind generating set is determined to have at least two single-shaft communication faults, the wind generating set is stopped.
In step S302, the master control system and the pitch system corresponding to the pitch controller with the single-shaft communication failure enter a redundant operation mode.
In step S303, in the redundant operation mode, the main control system keeps the external safety chain of the wind turbine generator system closed, and the main control controller controls the level signal of the safety chain of the wind turbine generator system according to the pitch speed output by the PID controller.
In case the wind park comprises an external safety chain, the level signal of the safety chain may be controlled by the main control controller according to the pitch speed output by the PID controller. In particular, when the pitch speed is positive, the external safety chain may be kept high by the master controller. When the pitch speed is negative or zero, the outer safety chain can be disconnected by the master controller.
Optionally, performing the corresponding pitch adjustment operation according to the pitch speed may be achieved by adding a new external safety chain in the wind park. Specifically, in the case where the wind turbine generator set includes two external safety chains, when the pitch speed output from the PID controller is a positive value, the level of the relay in the first safety chain of the two external safety chains may be set to a low level and the level of the relay in the second safety chain of the two external safety chains may be set to a high level by the master controller. When the pitch speed is negative, the level of the relays in the first safety chain and the second safety chain may be set to a high level by the master controller. When the pitch speed is zero, the level of the relay in the first safety chain may be set to a high level and the level of the relay in the second safety chain may be set to a low level by the master controller. However, the above examples are merely exemplary, and the present disclosure is not limited thereto.
In step S304, the pitch system with the single-shaft communication fault performs corresponding pitch adjusting operation according to the change of the level signal. Under the condition that the wind generating set comprises an external safety chain, when a variable pitch controller with a single-shaft communication fault detects that the external safety chain is at a high level, a corresponding variable pitch system executes a pitch collecting operation at a preset speed, otherwise, the wind generating set executes a shutdown treatment. Here, the predetermined speed may be set differently according to the experience of the wind power worker.
In addition, in the case that the wind generating set comprises two external safety chains, when the pitch controller with the single-shaft communication fault detects that the level of the relay in the first safety chain is low and the level of the relay in the second safety chain is high, the pitch system corresponding to the pitch controller executes the pitch retracting operation at a preset speed. When the variable pitch controller detects that the level of the relay in the first safety chain and the level of the relay in the second safety chain are high level, the corresponding variable pitch system executes the pitching operation according to the preset speed. When the pitch controller detects that the level of the relay in the first safety chain is high level and the level of the relay in the second safety chain is low level, the corresponding pitch system does not execute the pitch adjusting operation. The current pitch-adjusting direction of the wind driven generator can be accurately distinguished through a level signal of the safety chain, so that redundant operation of the wind driven generator set is realized, and the safety of the wind driven generator set can be ensured.
Fig. 4 is a flow chart of a control method of a wind park according to another exemplary embodiment of the present disclosure.
Referring to fig. 4, in step S401, it is determined by a main control controller of the wind turbine generator set whether a single axis communication fault occurs in the wind turbine generator set. If the wind generating set is determined to have the single-shaft communication fault, step S402 is executed. And if the wind generating set is determined to have at least two single-shaft communication faults, the redundant operation is not executed, and the main control system controls the wind generating set to stop.
In step S402, the master control system and the pitch system with the single-shaft communication failure enter a redundant operation mode.
In step S403, in the redundant operation mode, the main control system keeps the external safety chain of the wind turbine generator system closed, and the main control controller controls the level signal of the safety chain of the wind turbine generator system according to the pitch speed output by the PID controller.
In the case that the wind generating set comprises an external safety chain, the master controller may control the level signal of the safety chain according to the pitch speed output by the PID controller. In particular, when the pitch speed is positive, the external safety chain may be kept high by the master controller. When the pitch speed is negative or zero, the outer safety chain can be disconnected by the master controller.
Optionally, performing the corresponding pitch adjustment operation according to the pitch speed may be achieved by adding a new external safety chain in the wind park. Specifically, in the case where the wind turbine generator set includes two external safety chains, when the pitch speed output from the PID controller is a positive value, the level of the relay in the first safety chain of the two external safety chains may be set to a low level and the level of the relay in the second safety chain of the two external safety chains may be set to a high level by the master controller. When the pitch speed is negative, the level of the relays in the first safety chain and the second safety chain may be set to a high level by the master controller. When the pitch speed is zero, the level of the relay in the first safety chain may be set to a high level and the level of the relay in the second safety chain may be set to a low level by the master controller. However, the above examples are merely exemplary, and the present disclosure is not limited thereto.
In step S404, a pitch system with a single-shaft communication fault performs a corresponding pitch adjusting operation according to the change of the level signal. Under the condition that the wind generating set comprises an external safety chain, when a variable pitch controller with a single-shaft communication fault detects that the external safety chain is at a high level, a corresponding variable pitch system executes a pitch collecting operation at a preset speed, otherwise, the wind generating set executes a shutdown treatment. Here, the predetermined speed may be set differently according to the experience of the wind power worker.
In addition, in the case that the wind generating set comprises two external safety chains, when the pitch controller with the single-shaft communication fault detects that the level of the relay in the first safety chain is low and the level of the relay in the second safety chain is high, the pitch system corresponding to the pitch controller executes the pitch retracting operation at a preset speed. When the variable pitch controller detects that the level of the relay in the first safety chain and the level of the relay in the second safety chain are high level, the corresponding variable pitch system executes the pitching operation according to the preset speed. When the pitch controller detects that the level of the relay in the first safety chain is high level and the level of the relay in the second safety chain is low level, the corresponding pitch system does not execute the pitch adjusting operation. The current pitch-adjusting direction of the wind driven generator can be accurately distinguished through a level signal of the safety chain, so that redundant operation of the wind driven generator set is realized, and the safety of the wind driven generator set can be ensured.
In step S405, the main control system keeps the external safety chain closed, enters a redundant operation state, and monitors the rotation speed value of the wind turbine generator system. The purpose of monitoring the rotating speed value of the wind generating set is to ensure the operation safety of the wind generating set. Specifically, if the main control system detects that the rotating speed value of the wind driven generator exceeds a preset value, the external safety chain is disconnected, and the fault shutdown is triggered. Here, the preset value may be set according to design experience and practical circumstances.
In step S406, it is determined by the master controller whether the redundant operation mode has expired. If the preset redundant runtime arrives, step S407 is performed.
In step S407, it is determined by the master controller whether the single-axis communication failure is recovered to normal. If the single-axis communication failure is recovered to normal, step S409 is executed, otherwise step S408 is executed.
At step S408, the external safety chain is disconnected by the master control system and a failover is triggered.
In step S409, the master control system and the pitch system with the single-axis communication failure quit the redundant operation mode, and switch to the normal operation mode.
According to the embodiment of the disclosure, during the redundant operation, as the pitch control system with communication fault has a certain pitch control function, the operation safety of the wind driven generator can be ensured, and the fault of inconsistent angle caused by the pitch control of the blades can not be triggered immediately, so that the redundant operation time of the wind driven generator is prolonged, and the DP communication flash fault tolerance control is effectively carried out.
Fig. 5 is a schematic view of a control system of a wind park according to an exemplary embodiment of the present disclosure.
Referring to fig. 5, control system 500 may include a main control system 501 of a wind park, a pitch system 502, an electrically conductive slip ring 503, and an inner safety chain 504 and an outer safety chain 505. Here, fig. 5 shows three pitch systems 502 of a wind park with three blades. The master control system 501 includes a master control controller 506. Each pitch system 502 includes a pitch controller 507. Slip ring 503 includes a plurality of communication channels, and master controller 506 is connected with each pitch controller 507 via one communication channel of slip ring 503 for data communication.
Internal safety chain 504 may include a signal input, a signal output, and a number of contact switches of relay 13K4 corresponding to the number of pitch systems 502, each connected in series. Specifically, internal safety chain 504 is powered by a 24V power supply through a signal input, is connected in series with the contact switches of relays 13K4 of three pitch systems 502, and is then connected to digital input DI of master controller 506 via a signal output. The coil of each relay 13K4 is switched on and off by a corresponding pitch controller 507.
The external safety chain 505 may comprise signal inputs, signal outputs, an emergency stop button 3S3, an overspeed switch 3S2, a vibration switch 3S1, and a number of coils of the relay 18K9 corresponding to the number of pitch systems 502, etc. Specifically, the external safety chain 505 outputs a 24V signal via the digital output DO of the main controller 506, and the emergency stop button 3S3, the over speed switch 3S2, the vibration switch 3S1, and the coil of the relay 18K9 are connected in series. The contact switches of the relay 18K9 are each connected to the digital input DI of the respective pitch controller 507.
The scram button 3S3, the overspeed switch 3S2, and the vibration switch 3S1 are normally connected to the relay 128K4, and are collectively detected by the relay 128K4, wherein any signal that changes from high to low will cause the external safety chain 505 to be disconnected.
The main control controller 506 can control the start, operation and stop of the wind generating set, and sends a pitch angle control instruction to each pitch controller 507, and each pitch controller 507 controls the blade to be opened and closed to realize maximum power output and ensure the operation according to a stable rotating speed after receiving the instruction sent by the main control controller 506, and performs data interaction with the main control controller 506.
Under normal communication conditions, each pitch controller 507 controls the relay 13K4 in the respective pitch system 502 to pull in, and at the moment, the internal safety chain 504 is in a closed state. When a communication fault occurs in one pitch controller 507, the pitch controller 507 controls the corresponding relay 13K4 to be disconnected, so that the internal safety chain 504 is disconnected. After detecting that the internal safety chain 504 is disconnected, the main control controller 506 controls the external safety chain 505 to be disconnected through the relay 128K4, and after detecting that the external safety chain 505 is disconnected, the other pitch controller 507 without communication fault triggers a fault signal to synchronously receive the pitch with the pitch controller 507 with communication fault. However, this may lead to unnecessary shutdown of the wind park, affecting the power production of the wind park. In the present disclosure, the reference numerals of the relays are for illustration only, and are not intended to limit the models of the relays. The same type of relay or a different type of relay may be used as the above-described relay.
According to embodiments of the present disclosure, master controller 506 may determine whether a single-axis communication failure occurred with the wind turbine generator set. After the wind generating set is determined to have single-shaft communication failure, the main control system 501 and the variable pitch system 502 corresponding to the variable pitch controller 507 having the single-shaft communication failure enter a redundant operation mode. In the redundant operation mode, the main control system 501 keeps the external safety chain 505 closed and the main control controller 501 controls the level signal of the external safety chain 505 according to the pitch speed output by the PID controller, and the pitch system 502 with the single-shaft communication failure performs the corresponding pitch adjusting operation according to the change of the level signal.
The external safety chain 505 comprises relays corresponding to the number of pitch controllers of the wind park. Referring to fig. 5, a wind park with three blades has three pitch systems 502, each pitch system 502 comprising one pitch controller 507 and an external safety chain 505 comprising a relay corresponding to the pitch controller. For example, the external safety chain 205 may include three relays 18K9 or three relays 6K. However, the above examples are merely exemplary, and the present disclosure is not limited thereto.
Master controller 506 may set the level signal of external safety chain 505 by determining whether the pitch speed output from the PID controller is a positive value, a negative value, or a zero value, so that pitch system 502 with a single-shaft communication failure may perform different pitching operations depending on the level signal change of external safety chain 505.
As an example, the master controller 506 maintains the external safety chain 505 at a high level when the pitch speed output from the PID controller is positive. When the pitch speed is negative or zero, the master controller 506 disconnects the external safety chain 505.
When the pitch controller 507 with a single-shaft communication failure detects that the external safety chain 505 is at a high level, the corresponding pitch system 502 performs a pitch take-up operation at a predetermined speed. The predetermined speed may be set differently according to the operating conditions of the wind turbine generator set and the working experience of the designer.
In addition, when the master control system and the pitch system with the single-shaft communication fault are in a redundant operation mode, the master control controller 506 may monitor the rotating speed value of the wind turbine generator system in real time. When the monitored rotational speed value exceeds a preset value, the master control controller 506 may control the master control system 501 to disconnect the external safety chain 505 and trigger a fail-down. The running safety of the wind generating set is guaranteed by monitoring the rotating speed value of the generator.
When the redundant mode of operation expires, master controller 506 determines whether the single-axis communication failure is back to normal. If the single-shaft communication failure is recovered to be normal, the master control controller 506 controls the master control system 501 and the pitch system 502 with the single-shaft communication failure to perform a normal operation mode. If the single axis communication failure is not recovered, the master controller 506 controls the master control system 501 to disconnect the external safety chain 205 and trigger a failover.
When master control controller 506 determines that at least two single-axis communication faults occur in the wind turbine generator set, master control system 501 controls the wind turbine generator set to stop.
Fig. 6 is a block diagram of a control arrangement of a wind park according to an exemplary embodiment of the present disclosure.
Referring to fig. 6, the control apparatus 600 may include a determination module 601 and a control module 602. Each module in the control apparatus 600 may be implemented by one or more modules, and names of the corresponding modules may vary according to types of the modules. In various embodiments, some modules in the control device 600 may be omitted, or additional modules may be included. Furthermore, modules/elements according to various embodiments of the present disclosure may be combined to form a single entity, and thus the functions of the respective modules/elements may be equivalently performed prior to the combination.
The determination module 601 may determine whether a single-axis communication fault occurs with the wind park using a master controller of the wind park. The single-shaft communication fault is a communication fault between a main control controller and one variable pitch controller of the wind generating set caused by a fault of a conductive slip ring between the main control controller and the variable pitch controller.
After determining that the wind generating set has a single-shaft communication fault, the control module 602 may control the main control system to keep the external safety chain of the wind generating set closed, and control the level signal of the safety chain of the wind generating set according to the pitch speed output by the PID controller using the main control controller.
In the case that the wind park comprises an external safety chain, the control module 602 may control the main control controller to control the level signal of the safety chain according to the pitch speed output by the PID controller. Specifically, when the pitch speed is positive, the control module 602 may control the master controller to keep the external safety chain at a high level. When the pitch speed is a negative value or a zero value, the control module 602 may control the master controller to disconnect the outer safety chain.
In the case where the wind turbine generator set includes two external safety chains, when the pitch speed output from the PID controller is a positive value, the control module 602 may control the master controller to set the level of the relay in the first of the two external safety chains to a low level and set the level of the relay in the second of the two external safety chains to a high level. When the pitch speed is a negative value, the control module 602 may control the master controller to set the level of the relays in the first safety chain and the second safety chain to a high level. When the pitch speed is zero, the control module 602 may control the master controller to set the level of the relay in the first safety chain to a high level and the level of the relay in the second safety chain to a low level. However, the above examples are merely exemplary, and the present disclosure is not limited thereto.
The control module 602 may control the pitch system with the single-shaft communication failure to perform a corresponding pitch control operation according to the change of the level signal. In the case that the wind turbine generator set includes an external safety chain, when the control module 602 detects that the external safety chain is at a high level, the control module 602 may control the corresponding pitch system to perform a pitch retracting operation at a predetermined speed, otherwise, the wind turbine generator set performs a shutdown process. Here, the predetermined speed may be set differently according to the experience of the wind power worker.
Furthermore, in the case that the wind turbine generator set includes two external safety chains, when the control module 602 detects, by using the pitch controller in which the single-shaft communication failure occurs, that the level of the relay in the first safety chain is low and the level of the relay in the second safety chain is high, the control module 602 may control the pitch system corresponding to the pitch controller to perform the pitch take-up operation at a predetermined speed. When the control module 602 detects that the levels of the relays in the first safety chain and the second safety chain are high levels by using the pitch controller with the single-shaft communication fault, the control module 602 may control the corresponding pitch system to perform a pitching operation at a predetermined speed. When the control module 602 detects, by using the pitch controller in which the single-shaft communication failure occurs, that the level of the relay in the first safety chain is high and the level of the relay in the second safety chain is low, the control module 602 may control the corresponding pitch system not to perform the pitch control operation.
The current pitch-adjusting direction of the wind driven generator can be accurately distinguished through a level signal of the safety chain, so that redundant operation of the wind driven generator set is realized, and the safety of the wind driven generator set can be ensured.
In the redundant mode of operation, the control module 602 may monitor the rotational speed value of the wind turbine generator set in real time using the master controller. When the monitored rotational speed value exceeds the preset value, the control module 602 controls the master control system to disconnect the external safety chain and trigger the fault shutdown by using the master control.
In addition, the control module 602 may determine whether the redundant mode of operation has expired using the master controller. When the redundant mode of operation expires, the control module 602 may determine whether the single-axis communication failure is back to normal using the master controller. If the single-axis communication failure is recovered to be normal, the control module 602 may control the main control system and the pitch system with the single-axis communication failure to perform a normal operation mode. If the single axis communication failure is not recovered, the control module 602 controls the master control system to disconnect the external safety chain and trigger a failover.
When it is determined that at least two single-shaft communication faults occur in the wind generating set, the control module 602 controls the wind generating set to stop through the main control system.
One skilled in the art will appreciate that the present disclosure includes apparatus directed to performing one or more of the operations/steps described in the present disclosure. These devices may be specially designed and manufactured for the required purposes, or they may comprise known devices in general-purpose computers. These devices have stored therein computer programs that are selectively activated or reconfigured. Such a computer program may be stored in a device (e.g., computer) readable medium, including, but not limited to, any type of disk including floppy disks, hard disks, optical disks, CD-ROMs, and magnetic-optical disks, ROMs (Read-Only memories), RAMs (Random Access memories), EPROMs (Erasable Programmable Read-Only memories), EEPROMs (Electrically Erasable Programmable Read-Only memories), flash memories, magnetic cards, or optical cards, or any type of media suitable for storing electronic instructions, and each coupled to a bus. That is, a readable medium includes any medium that stores or transmits information in a form readable by a device (e.g., a computer).
According to the method, the operating characteristic that the variable pitch system of the wind generating set interacts with the master control system during operation is utilized, and after the single shaft of the wind generating set has a communication fault, the variable pitch system with the single shaft communication fault executes a pitch adjusting operation according to the level signal change of an external safety chain, so that the wind generating set effectively performs DP communication flash fault-tolerant control, and the operation safety of the wind generating set is ensured.
While the disclosure has been shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims and their equivalents.
Claims (20)
1. A method of pitch control of a wind turbine generator set, the method comprising:
determining whether a single-shaft communication fault occurs in the wind generating set by a master control controller of the wind generating set, wherein the single-shaft communication fault is a communication fault between the master control controller and one variable pitch controller of the wind generating set caused by a slip ring fault between the master control controller and the variable pitch controller;
after the wind generating set is determined to have single-shaft communication failure, a main control system of the wind generating set and a variable pitch system corresponding to a variable pitch controller having the single-shaft communication failure enter a redundant operation mode;
in a redundant operation mode, keeping a safety chain of the wind generating set closed by a main control system and controlling a level signal of the safety chain of the wind generating set by a main control controller according to the variable pitch speed output by the PID controller;
and executing corresponding blade adjusting operation by the blade adjusting system according to the change of the level signal.
2. The method of claim 1, wherein the safety chain comprises two external safety chains, and the two external safety chains each comprise a number of relays corresponding to a number of pitch controllers of a wind turbine generator set,
the method comprises the following steps that a master control controller controls a level signal of a safety chain of the wind generating set according to the variable pitch speed output by a PID controller, and comprises the following steps:
determining, by a master control controller, whether the pitch speed is a positive value, a negative value, or a zero value;
when the pitch speed is a positive value, setting the level of a relay in a first safety chain of the two external safety chains to be a low level and setting the level of a relay in a second safety chain of the two external safety chains to be a high level by a master control controller;
when the variable pitch speed is a negative value, the level of the relay in the first safety chain and the level of the relay in the second safety chain are set to be high level by the master control controller; and is
When the pitch speed is zero, the level of the relay in the first safety chain is set to be high level and the level of the relay in the second safety chain is set to be low level by the main control controller.
3. The method of claim 2, wherein the step of performing, by the pitch system, a respective pitching operation in accordance with the change in the level signal comprises:
when the pitch controller detects that the level of a relay in the first safety chain is low and the level of a relay in the second safety chain is high, the pitch system executes a pitch taking operation at a preset speed;
when the variable pitch controller detects that the level of the relay in the first safety chain and the level of the relay in the second safety chain are high level, the variable pitch system executes the pitching operation according to the preset speed;
when the one pitch controller detects that the level of the relay in the first safety chain is high and the level of the relay in the second safety chain is low, the pitch system does not execute the pitch adjusting operation.
4. The method of claim 1, wherein the method further comprises:
in a redundant operation mode, a main control controller monitors the rotating speed value of the wind generating set;
and when the rotating speed value exceeds a preset value, the safety chain is disconnected by the main control system and the fault shutdown is triggered.
5. The method of claim 1, wherein the method further comprises:
determining, by the master controller, whether the redundant mode of operation has expired;
when the redundancy operation mode expires, determining whether the single-shaft communication fault is recovered to be normal or not by the main control controller;
if the single-shaft communication fault is recovered to be normal, the master control system and the variable pitch system are in a normal operation mode;
if the single axis communication failure is not recovered, the safety chain is broken and a failover is triggered by the master control system.
6. The method of claim 1, wherein the method further comprises:
and when the wind generating set is determined to have at least two single-shaft communication faults, the main control system controls the wind generating set to stop.
7. The method of claim 1, wherein the security chain comprises an external security chain,
the method comprises the following steps that a master control controller controls a level signal of a safety chain of the wind generating set according to the variable pitch speed output by a PID controller, and comprises the following steps:
when the variable pitch speed is a positive value, the main control controller keeps the external safety chain at a high level;
and when the variable pitch speed is a negative value or a zero value, the main control controller disconnects the external safety chain.
8. The method of claim 7, wherein the step of performing, by the pitch system, a respective pitching operation in accordance with the change in the level signal comprises:
and when the pitch controller detects that the external safety chain is at a high level, the pitch system executes pitch withdrawing operation according to a preset speed.
9. A pitch control system of a wind power plant, the pitch control system comprising:
the master control system comprises a master control controller;
at least one pitch system comprising at least one pitch controller;
a slip ring comprising a plurality of communication channels respectively connecting the master controller with each of the at least one pitch controller for data communication; and
at least one external safety chain is arranged on the safety chain,
wherein the master control controller determines whether a single-shaft communication fault occurs in the wind generating set, the single-shaft communication fault being a communication fault between the master control controller and one of the at least one pitch system due to a slip ring fault between the master control controller and the one pitch controller,
after the wind generating set is determined to have single-shaft communication failure, the main control system and the variable pitch system corresponding to the variable pitch controller having the single-shaft communication failure enter a redundant operation mode,
in a redundant operation mode, the main control system keeps the at least one outer safety chain closed and the main control controller controls the level signal of the at least one outer safety chain according to the variable pitch speed output by the PID controller,
and the variable pitch system executes corresponding pitch adjusting operation according to the change of the level signal.
10. The pitch control system of claim 9, wherein the at least one external safety chain comprises two external safety chains, and the two external safety chains each comprise a number of relays corresponding to a number of pitch controllers of a wind turbine generator set,
wherein the master controller is configured to:
determining whether the pitch speed is a positive value, a negative value, or a zero value;
when the pitch speed is positive, setting a level of a relay in a first of the two external safety chains to a low level and setting a level of a relay in a second of the two external safety chains to a high level;
when the variable pitch speed is a negative value, setting the level of the relay in the first safety chain and the second safety chain to be a high level;
when the pitch speed is zero, setting the level of the relay in the first safety chain to a high level and setting the level of the relay in the second safety chain to a low level.
11. The pitch control system of claim 10, wherein the external safety chain comprises a signal input, a signal output, an emergency stop button, an over speed switch, a vibration switch, and a number of relays corresponding to a number of pitch controllers, wherein coils of the emergency stop button, the over speed switch, the vibration switch, and the relays are connected in series, and contact switches of the relays are respectively connected to corresponding pitch controllers.
12. The pitch control system of claim 10, wherein the pitch controller is configured to:
when detecting that the level of a relay in the first safety chain is low level and the level of a relay in the second safety chain is high level, controlling the variable pitch system to execute a pitch retracting operation at a preset speed;
when detecting that the level of the relays in the first safety chain and the second safety chain is high level, controlling the variable pitch system to execute a pitching operation according to a preset speed;
and when detecting that the level of the relay in the first safety chain is high level and the level of the relay in the second safety chain is low level, controlling the pitch system not to execute the pitch adjusting operation.
13. The pitch control system of claim 9, wherein the master controller is further configured to:
monitoring the rotating speed value of the wind generating set in a redundant operation mode;
and when the rotating speed value exceeds a preset value, controlling a main control system to disconnect the safety chain and trigger fault shutdown.
14. The pitch control system of claim 9, wherein the master controller is further configured to:
determining whether a redundant mode of operation has expired;
determining whether the single-axis communication failure is restored to normal when a redundant mode of operation expires;
if the single-shaft communication fault is recovered to be normal, controlling a master control system and the variable pitch system to operate in a normal operation mode;
if the single-axis communication failure is not recovered, the control master system disconnects the safety chain and triggers a failover.
15. The pitch control system of claim 9, wherein the master controller is further configured to:
and when at least two single-shaft communication faults of the wind generating set are determined, controlling the main control system to control the wind generating set to stop.
16. The pitch control system of claim 9, wherein the at least one safety chain comprises an outer safety chain,
wherein the master controller is configured to:
when the variable pitch speed is a positive value, keeping the external safety chain at a high level;
and when the variable pitch speed is a negative value or a zero value, disconnecting the outer safety chain.
17. The pitch control system of claim 16, wherein the pitch controller is configured to control the pitch system to perform a feathering operation at a predetermined speed when the one pitch controller detects that the one external safety chain is high.
18. A pitch control apparatus of a wind turbine generator set, the pitch control apparatus comprising:
the determining module is used for determining whether a single-shaft communication fault occurs in the wind generating set by using a master control controller of the wind generating set, wherein the single-shaft communication fault is a communication fault between the master control controller and one variable pitch controller of the wind generating set caused by a slip ring fault between the master control controller and the variable pitch controller;
a control module to:
after the single-shaft communication fault of the wind generating set is determined, controlling a main control system of the wind generating set and a variable pitch system corresponding to a variable pitch controller with the single-shaft communication fault to enter a redundant operation mode;
in a redundant operation mode, controlling the main control system to keep a safety chain of the wind generating set closed and controlling a level signal of the safety chain of the wind generating set according to the variable pitch speed output by the PID controller by using the main control controller;
and controlling the variable pitch system to execute corresponding pitch adjusting operation according to the change of the level signal.
19. An electronic device, comprising:
a memory for storing a program; and
one or more processors for performing one or more of the above-described operations,
wherein the one or more processors perform the method of any one of claims 1 to 8 when the program is run.
20. A computer-readable recording medium in which a program is stored, characterized in that the program comprises instructions for executing the method according to any one of claims 1 to 8.
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| CN114000974A (en) * | 2021-10-31 | 2022-02-01 | 重庆科凯前卫风电设备有限责任公司 | Redundancy control method based on variable-pitch variable-speed wind generating set |
| CN114000974B (en) * | 2021-10-31 | 2023-11-07 | 重庆科凯前卫风电设备有限责任公司 | Redundancy control method based on variable pitch variable speed wind generating set |
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