CN113446156A - State monitoring method, device, equipment and medium of variable pitch system - Google Patents

State monitoring method, device, equipment and medium of variable pitch system Download PDF

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Publication number
CN113446156A
CN113446156A CN202010231307.8A CN202010231307A CN113446156A CN 113446156 A CN113446156 A CN 113446156A CN 202010231307 A CN202010231307 A CN 202010231307A CN 113446156 A CN113446156 A CN 113446156A
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pitch
variable
pitch angle
temperature
variation
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CN113446156B (en
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马磊
胡清阳
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Jinfeng Technology Co ltd
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Xinjiang Goldwind Science and Technology Co Ltd
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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
    • 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
    • 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
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Wind Motors (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

The invention discloses a method, a device, equipment and a medium for monitoring the state of a variable pitch system. The state monitoring method of the variable pitch system comprises the following steps: acquiring first monitoring data of a variable pitch system at the current moment and second monitoring data of the variable pitch system at the previous moment; the first monitoring data comprise a first pitch angle and a first variable pitch motor temperature, and the second monitoring data comprise a second pitch angle and a second variable pitch motor temperature; calculating a pitch angle variation between the first pitch angle and the second pitch angle and a temperature variation between the temperature of the first variable pitch motor and the temperature of the second variable pitch motor; determining a state parameter of target equipment in a variable pitch system according to the variable quantity of the pitch angle and the variable quantity of the temperature; the target equipment is equipment for carrying out pitch variation by matching with a pitch variation motor in a pitch variation system. According to the embodiment of the invention, the state parameters of the target equipment in the variable pitch system can be monitored, so that the fault of the variable pitch system is avoided.

Description

State monitoring method, device, equipment and medium of variable pitch system
Technical Field
The invention belongs to the technical field of wind power generation, and particularly relates to a state monitoring method, device, equipment and medium of a variable pitch system.
Background
In the operation process of the wind generating set, once a variable pitch system fails, the wind generating set is stopped due to failure. Because the variable pitch system is a set of relatively complex system, a long time is required from fault maintenance to normal operation recovery, the generated energy of the wind generating set is reduced, and further economic loss is caused for enterprises.
In order to reduce economic loss, the conventional method is to acquire a fault file of the wind generating set when the wind generating set is in fault shutdown, and then quickly analyze the fault reason of the pitch system by using the operation data recorded by the fault file, so that the time for repairing the fault is shortened.
However, the number of fault files of the wind generating set is small, and the method for analyzing the fault reason of the pitch system after the wind generating set is in fault shutdown can only analyze the fault reason, and cannot avoid the fault of the pitch system, so that economic losses still exist in enterprises.
Disclosure of Invention
Embodiments of the present invention provide a method, an apparatus, a device, and a medium for monitoring a state of a pitch system, which can monitor a state parameter of a target device in the pitch system, thereby avoiding a fault of the pitch system.
In a first aspect, an embodiment of the present invention provides a method for monitoring a state of a pitch system, including:
acquiring first monitoring data of a variable pitch system at the current moment and second monitoring data of the variable pitch system at the previous moment; the first monitoring data comprise a first pitch angle and a first variable pitch motor temperature, and the second monitoring data comprise a second pitch angle and a second variable pitch motor temperature;
calculating a pitch angle variation between the first pitch angle and the second pitch angle and a temperature variation between the temperature of the first variable pitch motor and the temperature of the second variable pitch motor;
determining a state parameter of target equipment in a variable pitch system according to the variable quantity of the pitch angle and the variable quantity of the temperature; the target equipment is equipment for carrying out pitch variation by matching with a pitch variation motor in a pitch variation system.
In a second aspect, an embodiment of the present invention provides a state monitoring device for a pitch system, including:
the first acquisition module is used for acquiring first monitoring data of the variable pitch system at the current moment and second monitoring data of the variable pitch system at the previous moment; the first monitoring data comprise a first pitch angle and a first variable pitch motor temperature, and the second monitoring data comprise a second pitch angle and a second variable pitch motor temperature;
the first calculation module is used for calculating a pitch angle variation between the first pitch angle and the second pitch angle and a temperature variation between the temperature of the first variable pitch motor and the temperature of the second variable pitch motor;
the parameter determining module is used for determining the state parameter of the target equipment in the variable pitch system according to the variable pitch angle and the variable temperature; the target equipment is equipment for carrying out pitch variation by matching with a pitch variation motor in a pitch variation system.
In a third aspect, an embodiment of the present invention provides a state monitoring device for a pitch system, where the device includes: a processor and a memory storing computer program instructions;
the processor, when executing the computer program instructions, implements a method of monitoring a condition of a pitch system as described in the first aspect.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which computer program instructions are stored, and when the computer program instructions are executed by a processor, the method for monitoring the state of a pitch system according to the first aspect is implemented.
According to the state monitoring method, device, equipment and medium of the variable pitch system, the variable pitch angle and the temperature variable quantity between the current moment and the previous moment can be calculated based on the first pitch angle and the first variable pitch motor temperature of the variable pitch system at the current moment and the second pitch angle and the second variable pitch motor temperature at the previous moment, and the state parameter of the target equipment matched with the variable pitch motor to change the pitch in the variable pitch system is determined according to the variable pitch angle and the temperature variable quantity, so that the state parameter of the target equipment in the variable pitch system can be monitored based on the monitoring data of the variable pitch system, and the fault related to the target equipment of the variable pitch system can be prevented based on the state parameter of the target equipment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a pitch system provided by an embodiment of the invention;
FIG. 2 is a schematic flow diagram of a method for monitoring a state of a pitch system according to an embodiment of the invention;
FIG. 3 is a schematic flow diagram of a method for monitoring the state of a pitch system according to another embodiment of the invention;
FIG. 4 is a schematic flow diagram of a method for monitoring the state of a pitch system according to a further embodiment of the invention;
FIG. 5 is a schematic structural diagram of a state monitoring device of a pitch system according to an embodiment of the invention;
FIG. 6 is a schematic structural diagram of a state monitoring device of a pitch system according to an embodiment of the invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the operation process of the wind generating set, once a variable pitch system fails, the wind generating set is stopped due to failure. Because the pitch system is a set of more complex systems, one fault of the pitch system may be caused by different reasons, and taking the fault of the pitch system with inconsistent three-axis angles as an example, the fault may be caused by any one of the following reasons: the system comprises an encoder, an encoder power supply, a pitch system, a pitch driver or a pitch controller, wherein the encoder is connected with the pitch system through a power supply line, the pitch system is connected with the pitch driver through a pitch controller, and the pitch controller is connected with the pitch system through a pitch controller.
In order to reduce economic loss, the conventional method is to acquire a fault file generated by a variable pitch controller of a variable pitch system when a wind generating set is in fault shutdown, and then quickly analyze the fault reason of the variable pitch system by using operation data recorded by the fault file, so that the time for repairing the fault is shortened.
However, when data analysis is actually performed, it is found that the fault file is only recorded and generated after the wind generating set fails, for example, "fault recording" only records the operation data of the first 30s and the last 30s of the wind generating set that fails, so as to facilitate the analysis of the fault cause. If the wind generating set does not have faults for a long time, no fault file is generated in the period of time.
Therefore, the state monitoring of the pitch system of the wind generating set cannot be performed by using the fault file, and the method for analyzing the fault reason of the pitch system after the wind generating set is in fault shutdown cannot avoid the fault of the pitch system, so that the economic loss still exists in enterprises.
And a Supervisory Control And Data Acquisition (SCADA) system can generate a monitoring Data file every day, the time coverage is 24 hours, although the Data volume can be ensured, the sampling time interval of the monitoring Data file is too long, And a value is generally recorded for 5s to 7 s. For example, if the communication time of each wind turbine generator set with the SCADA system is 100ms, and the number of wind turbine generator sets in a single wind farm is 50, the time for all the wind turbine generator sets to communicate once is 100ms by 50 to 5000ms to 5s, and at this time, a value can be recorded every 5 s.
From the technical line of data analysis, generally, the shorter the sampling time interval is, the larger the reducible information amount is, and since the state change of each device of the wind turbine generator system is fast, if one data is collected every 5s-7s, the state of each device within the sampling time interval cannot be detected, the state fluctuation of each device is difficult to be reduced, and whether the state of each device is abnormal or not cannot be accurately judged according to the collected data, so that the state monitoring of each device of the pitch system is not convenient.
In order to solve the problem of the prior art, embodiments of the present invention provide a method, an apparatus, a device, and a medium for monitoring a state of a pitch system. First, a pitch system using the state monitoring method, the state monitoring device, the state monitoring equipment and the medium provided by the embodiment of the invention is described below.
FIG. 1 shows a schematic structural diagram of a pitch system provided by an embodiment of the invention. As shown in fig. 1, the pitch system includes a pitch capacitor 101, a pitch motor 102, a pitch frequency converter 103, a pitch charger 104, a pitch controller 105, and a brake relay (not shown in the figure).
The variable pitch capacitor 101 can be a super capacitor, the variable pitch frequency converter 103 is used for controlling the variable pitch motor 102 to operate, the variable pitch charger 104 is used for charging the variable pitch capacitor 101 when the power grid input is normal, and the variable pitch controller 105 is used for controlling each device in the variable pitch system to operate.
With continued reference to FIG. 1, the "+" output terminal of pitch charger 104 is electrically connected to the "+" terminal of pitch capacitor 101 and the "+" input terminal of pitch frequency converter 103, respectively; the output end of the pitch changing charger 104 is electrically connected with the input end of the pitch changing capacitor 101 and the input end of the pitch changing frequency converter 103.
The working principle of the variable pitch charger 104 is as follows: the variable pitch charger 104 monitors the voltage of the variable pitch capacitor 101 in real time and compares the voltage with a preset voltage; when the pitch system is pitched, i.e., the pitch motor 102 is running; when the voltage of the variable pitch capacitor 101 is reduced due to energy consumption of the variable pitch motor 102, the variable pitch charger 104 starts to charge the variable pitch capacitor 101, and the charging process is a proportional-integral-derivative (PID) control process, wherein the input quantity of the variable pitch charger 104 is a preset voltage, the feedback quantity is an actual voltage of the variable pitch capacitor 101, and the output quantity is a charging current.
And during the period that the variable pitch system does not change the pitch, the brake relay is in a contracting brake state, when the variable pitch system changes the pitch, the brake relay is opened to be in a brake releasing state, and the brake relay is in the contracting brake state again after the variable pitch system stops changing the pitch for more than 2 seconds, so that one-time relay action is completed.
FIG. 2 shows a schematic flow diagram of a state monitoring method of a pitch system according to an embodiment of the invention.
In some embodiments of the invention, the method as shown in FIG. 2 may be performed by a condition monitoring device and enable condition monitoring of the pitch system shown in FIG. 1.
As shown in FIG. 2, the state monitoring method of the pitch system may include:
s210, acquiring first monitoring data of a variable pitch system at the current moment and second monitoring data of the variable pitch system at the previous moment; the first monitoring data comprise a first pitch angle and a first variable pitch motor temperature, and the second monitoring data comprise a second pitch angle and a second variable pitch motor temperature;
s220, calculating a pitch angle variation between the first pitch angle and the second pitch angle and a temperature variation between the temperature of the first variable pitch motor and the temperature of the second variable pitch motor;
s230, determining a state parameter of target equipment in the variable pitch system according to the variable quantity of the pitch angle and the variable quantity of the temperature; the target equipment is equipment for carrying out pitch variation by matching with a pitch variation motor in a pitch variation system.
In the embodiment of the invention, the pitch angle variation and the temperature variation between the current moment and the previous moment can be calculated based on the first pitch angle and the first pitch motor temperature of the pitch system at the current moment and the second pitch angle and the second pitch motor temperature at the previous moment, and the state parameter of the target equipment in the pitch system, which is matched with the pitch motor to change the pitch, is determined according to the pitch angle variation and the temperature variation, so that the state parameter of the target equipment in the pitch system can be monitored based on the monitoring data of the pitch system, and the fault related to the target equipment can be prevented from occurring in the pitch system based on the state parameter of the target equipment.
In S210 according to some embodiments of the present invention, the state monitoring device may obtain, from a monitoring data file generated by the SCADA system, first monitoring data of the pitch system at a current time and second monitoring data of the pitch system at a previous time.
Optionally, the monitoring data file may record monitoring data of at least one pitch system of the wind turbine generator system, and the state monitoring device may directly acquire the monitoring data of the pitch system requiring state detection, and extract, from the acquired monitoring data, first monitoring data of the pitch system requiring state detection at the current time and second monitoring data of the pitch system requiring state detection at the previous time.
In some embodiments of the present invention, in a case that the monitoring data file is a history file, the current time may be a current sampling time to be analyzed, and the previous time may be a previous sampling time separated from the sampling time to be analyzed by a sampling time interval.
In other embodiments of the present invention, in a case that the monitoring data file is a real-time file, the current time may be a latest sampling time in the monitoring data file, and the previous time may be a previous sampling time separated from the latest sampling time by a sampling time interval.
In another embodiment of the present invention, in order to ensure reliability of obtaining the monitoring data, before S210, the method for monitoring the state of the pitch system may further include:
a Decentralized Peripheral (DP) communication status word is obtained.
Accordingly, the specific method of S210 may include:
and under the condition that the DP communication is determined to be normal according to the DP communication state word, acquiring first monitoring data of the pitch system at the current moment and second monitoring data of the pitch system at the previous moment.
Therefore, the monitoring data can be acquired only under the condition that the DP communication is normal, and the reliability of acquiring the monitoring data is improved.
In S220 according to some embodiments of the present invention, the first pitch angle and the second pitch angle may be subtracted to obtain a pitch angle variation, and the first pitch motor temperature and the second pitch motor temperature may be subtracted to obtain a temperature variation.
In some embodiments of the invention, the target device may comprise a pitch charger and accordingly the state parameter may comprise an average charging current.
Therefore, in the embodiment of the invention, whether the variable pitch charger is in a normal working state can be determined based on the average charging current of the variable pitch charger, and whether the variable pitch capacitor is in a normal working state can be determined based on whether the average charging current exceeds the maximum charging current of the variable pitch capacitor, so that faults related to the variable pitch charger and the variable pitch capacitor are avoided occurring in the variable pitch system. In addition, the average charging current of the variable pitch charger can also provide reference for determining the capacitance parameter of the variable pitch capacitor to be replaced.
Furthermore, the average charging current of the variable pitch charger between the current moment and the last moment can be obtained through calculation, so that the charging current data corresponding to each time unit in the sampling time interval can be obtained, the charging current data of each time unit in the sampling time interval is increased, namely the process quantity of the charging current in the sampling time interval is increased, the change process of the average charging current of the variable pitch charger in the sampling time interval can be reflected, the charging current data quantity for data analysis is increased, and the quantization precision of the charging current statistics of the variable pitch charger can be improved.
FIG. 3 shows a schematic flow diagram of a state monitoring method of a pitch system according to another embodiment of the invention.
As shown in FIG. 3, the state monitoring method of the pitch system may include:
s310, acquiring first monitoring data of a variable pitch system at the current moment and second monitoring data of the variable pitch system at the previous moment; the first monitoring data comprise a first pitch angle and a first variable pitch motor temperature, and the second monitoring data comprise a second pitch angle and a second variable pitch motor temperature;
s320, calculating a pitch angle variation between the first pitch angle and the second pitch angle and a temperature variation between the temperature of the first variable pitch motor and the temperature of the second variable pitch motor;
wherein, the principles of S310-S320 are similar to those of S210-S220 shown in fig. 2, and are not described herein again;
s330, under the condition that the pitch angle variation and the temperature variation are both nonzero, calculating the average pitch speed according to the pitch angle variation;
s340, calculating the average torque of the variable pitch motor according to the average variable pitch speed;
and S350, calculating the average charging current of the variable pitch charger according to the average torque.
In S330 according to some embodiments of the present invention, if the pitch angle variation is nonzero, it indicates that a pitch action of the pitch system occurs. However, under the condition that the communication between the wind generating set and the SCADA system is interrupted and restored for a short time, the angle value may be suddenly changed to 0 due to the interruption of the communication, at this time, the pitch angle variation is also nonzero, and the pitch control system does not generate pitch control action actually, at this time, auxiliary detection can be performed through the temperature variation, and if the pitch control system does not generate pitch control action, the temperature of the pitch control motor does not change. Therefore, if the temperature of the variable pitch motor is also changed, namely the temperature change is nonzero, the variable pitch system is subjected to variable pitch action.
In S330 according to some embodiments of the present invention, after it is determined that the pitch system has performed a pitch variation, the pitch variation may be divided by a time interval between the current time and the previous time, and an average pitch variation speed may be calculated.
In S340 in some embodiments of the present invention, the average rotation speed of the pitch motor may be calculated according to the average pitch speed, and then the average torque corresponding to the average rotation speed is calculated according to the correspondence between the rotation speed and the torque.
In S350 according to some embodiments of the present invention, the average charging current of the pitch charger may be calculated according to the average pitch speed, the average torque, and the time interval between the current time and the previous time.
Therefore, in the embodiment of the invention, curve digitization can be realized, the charging current data of each time unit in the sampling time interval is increased, namely the process quantity of the charging current in the sampling time interval is increased, the change process of the average charging current of the variable pitch charger in the sampling time interval can be embodied, and the charging current data quantity for data analysis is increased, so that the defects of long sampling time interval and less collected data of the monitoring data are overcome, therefore, the average value calculation of the charging current of the variable pitch charger is carried out through the operation characteristic of the variable pitch system, and higher detection accuracy can be achieved.
The process of S330-S350 will be described in detail below with reference to the operational characteristics of the pitch system.
If the pitch speed of a blade controlled by a pitch system during pitch variation is v (unit is degree/s), the transmission ratio of the pitch system is a, the rotating speed of a pitch motor is N ═ v × a, the time required from the start of pitch variation to the completion of pitch variation (for example, the position of the blade reaches 89 degrees) is t, the torque of the pitch motor is N, and the power of the pitch motor is P, wherein the relationship among the torque N, the rotating speed N, and the power P of the pitch motor is as follows:
P＝N*n/9550＝N*v*a/9550 (1)
the mechanical work W done by the pitch motor is changed within the time t1Comprises the following steps:
W1＝P*t/b/c (2)
wherein t can be acquired by a pitch controller, b is a power factor of the pitch motor and is set according to motor parameters, generally 91%, and c is efficiency of the pitch motor and is also set according to the motor parameters, generally 91%.
After the variable pitch motor of the variable pitch system is determined, the characteristics of the rotating speed and the torque of the variable pitch motor are also determined, a characteristic curve of the rotating speed and the torque of the variable pitch motor can be obtained, wherein the torque is specifically the output torque of the variable pitch motor, and the corresponding relation between the rotating speed and the torque of the variable pitch motor is obtained based on the characteristic curve fitting of the rotating speed and the torque.
In the pitch variation process of the pitch variation system, the voltage of the pitch variation capacitor is V3Down to V4Theoretical energy W of2Comprises the following steps:
W2＝0.5*C*(V3*V3-V4*V4) (3)
wherein C is a calibration capacitance value of the variable pitch capacitor, V3The rated voltage of the variable pitch capacitor.
When the voltage is input into a power grid, the variable pitch charger can charge and supplement the variable pitch capacitor, so that the voltage of the variable pitch capacitor is maintained at a rated voltage, and meanwhile, the variable pitch charger also needs to provide a power supply for the operation of a variable pitch motor.
When the variable pitch system is set to change the pitch, the charging voltage of the variable pitch charger is U, the charging current is I, and the energy W provided by the variable pitch charger is within the time t3Comprises the following steps:
W3＝U*I*t (4)
the combined vertical type (1), the combined vertical type (2), the combined vertical type (3) and the combined vertical type (4) can obtain the energy provided by the variable pitch charger according to the energy conservation principle of charging and power consumption of the variable pitch system, and the energy is equal to the sum of the energy maintaining variable pitch capacitor voltage, the energy consumption of the variable pitch motor and the energy consumption of other devices, namely:
W3＝W1+W2+W4
U*I*t＝N*v*a*t/b/c/9550+0.5*C*(V3*V3-V4*V4)+W4 (5)
wherein, W4For other devices to consume energy, the other devices may be 24V devices in the pitch control cabinet, for example, sensors such as Programmable Logic Controller (PLC), encoder, brake relay, proximity switch, and W4The detection or calculation can be performed by the existing method, which is not described herein.
In a short time, the voltage drop amount of the variable pitch capacitor is low, so that the formula (5) can be simplified:
U*I*t＝N*v*a*t/b/c/9550+W4 (6)
therefore, according to the formula, the average charging current of the variable pitch charger can be calculated according to the average variable pitch speed, the average torque, the time interval between the current moment and the last moment and the charging voltage.
Therefore, under the condition that the monitoring data file does not include the variable related to the charging current of the variable pitch charger, the average charging current of the variable pitch charger can be calculated according to the characteristic curve of the rotating speed and the torque of the variable pitch motor and the energy conservation principle, and therefore the method provided by the embodiment of the invention can be suitable for monitoring data files of different historical versions and different variables and is high in applicability.
In another embodiment of the present invention, in order to improve the detection reliability of the pitch variation action, the first monitoring data may further include a first pitch variation capacitance voltage, and the second monitoring data may further include a second pitch variation capacitance voltage;
in these embodiments, optionally, before calculating the average pitch speed according to the change amount of the pitch angle in S330, the method for monitoring the state of the pitch system may include:
calculating a voltage variation between the first variable-pitch capacitor voltage and the second variable-pitch capacitor voltage;
accordingly, the specific method for calculating the average pitch speed according to the change amount of the pitch angle in S330 may include:
and under the condition that the voltage variation is nonzero, calculating the average variable pitch speed according to the variable quantity of the pitch angle.
Under the condition that communication between the wind generating set and the SCADA system is interrupted and recovered for a short time, the angle value may be suddenly changed to 0 due to the interruption of the communication, at this time, the pitch angle variation is also nonzero, and actually, the pitch control system does not generate pitch control action.
In other embodiments of the invention, the target device may comprise a pitch charger and accordingly the state parameter may comprise an average charging current.
In these embodiments, optionally, the specific method of S230 shown in fig. 2 may further include:
under the condition that the pitch angle variation and the temperature variation are both nonzero, calculating the average current of the variable pitch motor according to the temperature variation;
calculating the average torque of the variable pitch motor according to the relation between the current and the torque of the variable pitch motor;
and calculating the average charging current of the variable pitch charger according to the average torque.
Specifically, the average current of the variable pitch motor corresponding to the temperature variation can be directly calculated according to the relationship between the heat and the temperature, the mechanical work of the variable pitch motor between the current moment and the last moment is calculated according to the average current of the variable pitch motor, and the average charging current of the variable pitch charger is calculated according to the mechanical work of the variable pitch motor.
Wherein, the relationship between the heat quantity and the temperature is as follows: heat-mass-specific heat-capacity-temperature change, i.e., Q-CM (T2-T1), where Q is the heat, C is the mass of the object, M is the specific heat capacity (look-up table) of the object, T2Is the final temperature of the object, T1Is the initial temperature of the object, for a pitch motor, Q ═ I2R, R is the coil resistance of the variable pitch motor, from which I2＝CM(T2-T1)/R/T, where CM/R can be considered as a constant, so the temperature variation of the pitch motor is proportional to the square of the current.
In other embodiments of the present invention, the target device may be a brake relay, and accordingly, the status parameter may be a number of actions.
Therefore, in the embodiment of the invention, the service life of the brake relay can be determined based on the action times of the brake relay, so that the failure time of the brake relay can be judged, and the fault of the variable pitch system caused by the failure of the brake relay is avoided.
FIG. 4 shows a schematic flow diagram of a state monitoring method of a pitch system according to a further embodiment of the invention.
As shown in FIG. 4, the state monitoring method of the pitch system may include:
s410, acquiring an automatic pitch period and a single-shaft pitch opening period corresponding to a pitch system;
s420, under the condition that the current moment belongs to an automatic pitch period, acquiring first monitoring data of a pitch system at the current moment and second monitoring data of the pitch system at the previous moment; the first monitoring data comprise a first pitch angle and a first variable pitch motor temperature, and the second monitoring data comprise a second pitch angle and a second variable pitch motor temperature;
s430, calculating a pitch angle variation between the first pitch angle and the second pitch angle and a temperature variation between the temperature of the first variable pitch motor and the temperature of the second variable pitch motor;
wherein, the principles of S420-S430 are similar to those of S210-S220 shown in fig. 2, and are not described herein again;
s440, determining a state parameter of target equipment in the variable pitch system according to the variable quantity of the pitch angle and the variable quantity of the temperature; the target equipment is equipment which is matched with a variable pitch motor in a variable pitch system to change the pitch, specifically, the target equipment comprises a brake relay, and the state parameters comprise action times.
In S410 of some embodiments of the present invention, an automatic pitch period and a single-shaft pitch period corresponding to the pitch system may be determined directly based on the monitoring data file.
After S410 of some embodiments of the present invention, the method for monitoring the state of the pitch system may include:
when the current time is the first time in the single-shaft opening period, the integrated value of the operation times is added by 1.
The single-shaft propeller opening period is a manual debugging period of the variable propeller system, and in the period, the brake relay can only execute one brake releasing action, so that the brake relay is always kept in a brake releasing state in the whole manual debugging period, and the brake relay is in a brake contracting state again after the manual debugging period is finished.
Therefore, when the current time is the first time in the single-shaft opening period, the current cumulative value of the number of actions may be increased by 1 time, and when the current time is not the first time in the single-shaft opening period, the current cumulative value of the number of actions may not be changed.
In some embodiments of the invention, the first monitoring data may further include a first pitch motor speed;
in these embodiments, optionally, the specific method of S440 may include:
adding 1 to the accumulated value of the action times under the condition that the current moment is the moment that the rotating speed of a first variable-pitch motor in the automatic variable-pitch period is greater than the preset rotating speed and the first pitch angle is smaller than the preset pitch angle;
and under the condition that the current moment is the moment that the rotating speed of the non-first variable pitch motor in the automatic variable pitch period is greater than the preset rotating speed and the first pitch angle is smaller than the preset pitch angle, updating the accumulated value of the action times according to the pitch angle variable quantity and the temperature variable quantity.
Specifically, when the current time is the time when the first variable pitch motor in the automatic variable pitch period has a rotating speed greater than the preset rotating speed and the first pitch angle is smaller than the preset pitch angle, the current time is the time when the wind generating set starts variable pitch, and at this time, the brake relay only performs one brake release action, and the number of times of the brake release action can be increased by 1 time on the basis of the current accumulated value of the action times.
And under the condition that the current moment is the moment that the rotating speed of the first variable pitch motor is not greater than the preset rotating speed and the first pitch angle is smaller than the preset pitch angle in the automatic pitch period, updating the accumulated value of the action times according to the pitch angle variable quantity and the temperature variable quantity.
In some embodiments of the invention, the first monitored data may further include a first wind speed, and the second monitored data may further include a second wind speed;
in these embodiments, optionally, before updating the accumulated value of the action times according to the pitch angle change amount and the temperature change amount, the state monitoring method of the pitch system may include:
calculating the wind speed variation between the first wind speed and the second wind speed under the condition that the first wind speed is less than or equal to the rated wind speed;
accordingly, a specific method of updating the integrated value of the number of operations according to the pitch angle change amount and the temperature change amount may include:
when either the pitch angle change amount or the temperature change amount is nonzero and the wind speed change amount is a positive number, 1 is added to the integrated value of the number of operations.
Therefore, whether the wind generating set generates the pitch variation action or not can be comprehensively determined according to the first wind speed, the wind speed variation, the pitch angle variation and the temperature variation at the current moment, whether the brake relay performs the brake release action or not is further judged, if the first wind speed is less than or equal to any one of the rated wind speed, the pitch angle variation and the temperature variation and is nonzero and the wind speed variation is a positive number, the wind generating set generates the pitch variation action, the brake relay performs the brake release action once, and the operation times can be increased by 1 time on the basis of the current accumulated value of the action times.
In this case, if either the pitch angle variation or the temperature variation is nonzero, it can be determined that the wind turbine generator system has performed the pitch control operation.
In other embodiments of the present invention, before updating the accumulated value of the number of actions according to the pitch angle variation and the temperature variation, the method for monitoring the state of the pitch system may further include:
under the condition that the first wind speed is greater than the rated wind speed, calculating a pitch angle deviation between the first pitch angle and the minimum value of the pitch angle;
accordingly, a specific method of updating the integrated value of the number of operations according to the pitch angle change amount and the temperature change amount may include:
when the pitch angle deviation amount is a positive number, 1 is added to the integrated value of the number of operations.
Specifically, if the pitch angle deviation between the first pitch angle and the minimum pitch angle is a positive number, it indicates that the pitch motor is started once, the wind generating set performs a pitch control operation, and the brake relay performs a brake release operation once, which may be increased by 1 time based on the current accumulated value of the operation times.
In some embodiments, the pitch angle minimum may be 0 °. In other embodiments, the minimum pitch angle may also be set as desired, and likewise, the preset pitch angle and the rated wind speed may be set according to the operational characteristic requirements of the wind turbine generator system.
In summary, the method provided by the embodiment of the present invention can make up for the deficiency that the data statistics is incomplete and inaccurate due to the overlong sampling time interval of the monitoring data file, so that the statistical value of the state parameter of the target device in the pitch system is more accurate.
FIG. 5 shows a schematic structural diagram of a state monitoring device of a pitch system according to an embodiment of the invention.
In some embodiments of the present invention, the apparatus shown in FIG. 5 may be disposed within a condition monitoring device and enable condition monitoring of the pitch system shown in FIG. 1.
As shown in fig. 5, the state monitoring device of the pitch system may include:
a first obtaining module 510, configured to obtain first monitoring data of a pitch system at a current time and second monitoring data of the pitch system at a previous time; the first monitoring data comprise a first pitch angle and a first variable pitch motor temperature, and the second monitoring data comprise a second pitch angle and a second variable pitch motor temperature;
a first calculating module 520, configured to calculate a pitch angle variation between the first pitch angle and the second pitch angle and a temperature variation between the temperature of the first pitch motor and the temperature of the second pitch motor;
a parameter determining module 530, configured to determine a state parameter of a target device in the pitch system according to the pitch angle variation and the temperature variation; the target equipment is equipment for carrying out pitch variation by matching with a pitch variation motor in a pitch variation system.
In the embodiment of the invention, the pitch angle variation and the temperature variation between the current moment and the previous moment can be calculated based on the first pitch angle and the first pitch motor temperature of the pitch system at the current moment and the second pitch angle and the second pitch motor temperature at the previous moment, and the state parameter of the target equipment in the pitch system, which is matched with the pitch motor to change the pitch, is determined according to the pitch angle variation and the temperature variation, so that the state parameter of the target equipment in the pitch system can be monitored based on the monitoring data of the pitch system, and the fault related to the target equipment can be prevented from occurring in the pitch system based on the state parameter of the target equipment.
In some embodiments of the invention, the target device comprises a pitch charger, the state parameter comprises an average charging current;
the parameter determining module 530 may be specifically configured to:
under the condition that the pitch angle variation and the temperature variation are both nonzero, calculating the average pitch speed according to the pitch angle variation;
calculating the average torque of the variable pitch motor according to the average variable pitch speed;
and calculating the average charging current of the variable pitch charger according to the average torque.
In some embodiments of the invention, the first monitoring data further comprises a first pitch capacitor voltage, and the second monitoring data further comprises a second pitch capacitor voltage;
wherein, this state monitoring device of oar system can also include:
the second calculation module is used for calculating the voltage variation between the first variable-pitch capacitor voltage and the second variable-pitch capacitor voltage before calculating the average variable-pitch speed according to the variable quantity of the pitch angle;
accordingly, the parameter determination module 530 may be specifically configured to:
and under the condition that the voltage variation is nonzero, calculating the average variable pitch speed according to the variable quantity of the pitch angle.
In other embodiments of the present invention, the target device comprises a brake relay, and the state parameter comprises a number of actions;
wherein, this state monitoring device of oar system can also include:
the second acquisition module is used for acquiring an automatic pitch period and a single-shaft pitch opening period corresponding to the pitch system before acquiring the first monitoring data of the pitch system at the current moment and the second monitoring data of the pitch system at the previous moment;
correspondingly, the first obtaining module 510 is specifically configured to:
and under the condition that the current moment belongs to the automatic pitch period, acquiring first monitoring data and second monitoring data.
In some embodiments of the present invention, the parameter determination module 530 is further configured to:
after the automatic pitch period and the single-shaft pitch period corresponding to the pitch system are obtained, under the condition that the current moment is the first moment in the single-shaft pitch period, the accumulated value of the action times is added by 1.
In some embodiments of the invention, the first monitoring data further comprises a first pitch motor speed;
the parameter determining module 530 may be specifically configured to:
adding 1 to the accumulated value of the action times under the condition that the current moment is the moment that the rotating speed of a first variable-pitch motor in the automatic variable-pitch period is greater than the preset rotating speed and the first pitch angle is smaller than the preset pitch angle;
and under the condition that the current moment is the moment that the rotating speed of the non-first variable pitch motor in the automatic variable pitch period is greater than the preset rotating speed and the first pitch angle is smaller than the preset pitch angle, updating the accumulated value of the action times according to the pitch angle variable quantity and the temperature variable quantity.
In some embodiments of the invention, the first monitored data further comprises a first wind speed, and the second monitored data further comprises a second wind speed;
wherein, this state monitoring device of oar system can also include:
the third calculation module is used for calculating the wind speed variation between the first wind speed and the second wind speed under the condition that the first wind speed is less than or equal to the rated wind speed before the accumulated value of the action times is updated according to the pitch angle variation and the temperature variation;
accordingly, the parameter determination module 530 may be further configured to:
when either the pitch angle change amount or the temperature change amount is nonzero and the wind speed change amount is a positive number, 1 is added to the integrated value of the number of operations.
In some embodiments of the present invention, the third computing module may be further configured to:
under the condition that the first wind speed is greater than the rated wind speed, calculating a pitch angle deviation between the first pitch angle and the minimum value of the pitch angle;
accordingly, the parameter determination module 530 may be further configured to:
when the pitch angle deviation amount is a positive number, 1 is added to the integrated value of the number of operations.
It should be noted that the state monitoring device of the pitch system provided in the embodiment of the present invention can implement each process and effect implemented by the state monitoring device in the method embodiments of fig. 2 to fig. 4, and is not described here again to avoid repetition.
FIG. 6 shows a schematic structural diagram of a state monitoring device of a pitch system according to an embodiment of the invention.
FIG. 6 is a schematic structural diagram of a state monitoring device of a pitch system according to an embodiment of the invention. May include a processor 601 and a memory 602 storing computer program instructions.
Specifically, the processor 601 may include a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or may be configured as one or more Integrated circuits implementing embodiments of the present invention.
Memory 602 may include mass storage for data or instructions. By way of example, and not limitation, memory 602 may include a Hard Disk Drive (HDD), floppy Disk Drive, flash memory, optical Disk, magneto-optical Disk, tape, or Universal Serial Bus (USB) Drive or a combination of two or more of these. Memory 602 may include removable or non-removable (or fixed) media, where appropriate. The memory 602 may be internal or external to the integrated gateway disaster recovery device, where appropriate. In a particular embodiment, the memory 602 is a non-volatile solid-state memory. In a particular embodiment, the memory 602 includes Read Only Memory (ROM). Where appropriate, the ROM may be mask-programmed ROM, Programmable ROM (PROM), Erasable PROM (EPROM), Electrically Erasable PROM (EEPROM), electrically rewritable ROM (EAROM), or flash memory or a combination of two or more of these.
The processor 601 may implement the state monitoring method of the pitch system according to any of the above embodiments by reading and executing computer program instructions stored in the memory 602.
In one example, the state monitoring device of the pitch system may also include a communication interface 603 and a bus 610. As shown in fig. 6, the processor 601, the memory 602, and the communication interface 603 are connected via a bus 610 to complete communication therebetween.
The communication interface 603 is mainly used for implementing communication between modules, apparatuses, units and/or devices in the embodiments of the present invention.
Bus 610 includes hardware, software, or both that couple the components of the condition monitoring devices of the pitch system to each other. By way of example, and not limitation, a bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hypertransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an infiniband interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a video electronics standards association local (VLB) bus, or other suitable bus or a combination of two or more of these. Bus 610 may include one or more buses, where appropriate. Although specific buses have been described and shown in the embodiments of the invention, any suitable buses or interconnects are contemplated by the invention.
The state monitoring device of the pitch system may perform the state monitoring method of the pitch system in the embodiment of the present invention, thereby implementing the state monitoring method and apparatus of the pitch system described with reference to fig. 2 to 5.
In addition, in combination with the state monitoring method of the pitch system in the foregoing embodiment, an embodiment of the present invention may provide a computer-readable storage medium to implement the method. The computer readable storage medium having stored thereon computer program instructions; the computer program instructions, when executed by a processor, implement a method of monitoring a condition of a pitch system of any of the above embodiments.
It is to be understood that the invention is not limited to the specific arrangements and instrumentality described above and shown in the drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications and additions or change the order between the steps after comprehending the spirit of the present invention.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
It should also be noted that the exemplary embodiments mentioned in this patent describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.
As described above, only the specific embodiments of the present invention are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.

Claims (11)

1. A method for monitoring the state of a pitch system is characterized by comprising the following steps:
acquiring first monitoring data of the variable pitch system at the current moment and second monitoring data of the variable pitch system at the previous moment; the first monitoring data comprise a first pitch angle and a first variable pitch motor temperature, and the second monitoring data comprise a second pitch angle and a second variable pitch motor temperature;
calculating a pitch angle variation between the first pitch angle and the second pitch angle and a temperature variation between the temperature of the first variable pitch motor and the temperature of the second variable pitch motor;
determining a state parameter of target equipment in the variable pitch system according to the variable pitch angle and the variable temperature; the target equipment is equipment which is matched with a variable pitch motor in the variable pitch system to change the pitch.
2. The method of claim 1, wherein the target device comprises a pitch charger, the state parameter comprises an average charging current;
determining a state parameter of a target device in the variable pitch system according to the pitch angle variation and the temperature variation, wherein the determining the state parameter comprises:
under the condition that the pitch angle variation and the temperature variation are both nonzero, calculating an average pitch variation speed according to the pitch angle variation;
calculating the average torque of the variable pitch motor according to the average variable pitch speed;
and calculating the average charging current of the variable pitch charger according to the average torque.
3. The method of claim 2, wherein the first monitoring data further comprises a first pitch capacitance voltage and the second monitoring data further comprises a second pitch capacitance voltage;
before calculating the average pitch speed according to the pitch angle variation, the method further comprises:
calculating a voltage variation between the first variable-pitch capacitor voltage and the second variable-pitch capacitor voltage;
calculating an average variable pitch speed according to the variable pitch angle, including:
and under the condition that the voltage variation is nonzero, calculating the average variable pitch speed according to the variable pitch angle.
4. The method of claim 1, wherein the target device comprises a brake relay, the status parameter comprises a number of actions;
before the obtaining of the first monitoring data of the pitch system at the current moment and the second monitoring data of the pitch system at the previous moment, the method further includes:
acquiring an automatic pitch period and a single-shaft pitch opening period corresponding to the pitch system;
the acquiring of the first monitoring data of the pitch control system at the current moment and the second monitoring data of the pitch control system at the previous moment includes:
and under the condition that the current moment belongs to the automatic pitch variation period, acquiring the first monitoring data and the second monitoring data.
5. The method according to claim 4, wherein after acquiring the corresponding automatic pitch period and single-shaft pitch period of the pitch system, the method further comprises:
and when the current time is the first time in the single-shaft opening period, adding 1 to the accumulated value of the action times.
6. The method of claim 4, wherein the first monitoring data further comprises a first pitch motor speed;
determining a state parameter of a target device in the variable pitch system according to the pitch angle variation and the temperature variation, wherein the determining the state parameter comprises:
adding 1 to the accumulated value of the action times under the condition that the current moment is the moment when the rotating speed of a first variable-pitch motor in the automatic variable-pitch period is greater than a preset rotating speed and the first pitch angle is smaller than a preset pitch angle;
and updating the accumulated value of the action times according to the pitch angle variable quantity and the temperature variable quantity under the condition that the current moment is the moment when the rotating speed of the non-first pitch changing motor in the automatic pitch changing period is greater than the preset rotating speed and the first pitch angle is smaller than the preset pitch angle.
7. The method of claim 6, wherein the first monitored data further comprises a first wind speed, the second monitored data further comprises a second wind speed;
before updating the accumulated value of the number of actions according to the pitch angle change amount and the temperature change amount, the method further includes:
calculating a wind speed variation between the first wind speed and the second wind speed in case the first wind speed is less than or equal to a rated wind speed;
wherein the updating the integrated value of the number of operations based on the pitch angle change amount and the temperature change amount includes:
and adding 1 to an integrated value of the number of operations when the pitch angle change amount and the temperature change amount are both nonzero and the wind speed change amount is a positive number.
8. The method according to claim 7, wherein before updating the accumulated value of the number of actions based on the change in pitch angle and the change in temperature, the method further comprises:
calculating a pitch angle deviation between the first pitch angle and a pitch angle minimum value when the first wind speed is greater than the rated wind speed;
wherein the updating the integrated value of the number of operations based on the pitch angle change amount and the temperature change amount includes:
and adding 1 to the integrated value of the operation times when the pitch angle deviation amount is a positive number.
9. A condition monitoring device of a pitch system, comprising:
the first acquisition module is used for acquiring first monitoring data of the variable pitch system at the current moment and second monitoring data of the variable pitch system at the previous moment; the first monitoring data comprise a first pitch angle and a first variable pitch motor temperature, and the second monitoring data comprise a second pitch angle and a second variable pitch motor temperature;
the first calculation module is used for calculating a pitch angle variation between the first pitch angle and the second pitch angle and a temperature variation between the temperature of the first variable pitch motor and the temperature of the second variable pitch motor;
the parameter determining module is used for determining the state parameter of the target equipment in the variable pitch system according to the variable pitch angle and the variable temperature; the target equipment is equipment which is matched with a variable pitch motor in the variable pitch system to change the pitch.
10. A condition monitoring device of a pitch system, the device comprising: a processor and a memory storing computer program instructions;
the processor, when executing the computer program instructions, implements a method of condition monitoring of a pitch system according to any of claims 1-8.
11. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon computer program instructions, which, when executed by a processor, implement a method of monitoring a condition of a pitch system according to any of claims 1-8.
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