CN113446156B - State monitoring method, device, equipment and medium of pitch system - Google Patents

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

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Publication number
CN113446156B
CN113446156B CN202010231307.8A CN202010231307A CN113446156B CN 113446156 B CN113446156 B CN 113446156B CN 202010231307 A CN202010231307 A CN 202010231307A CN 113446156 B CN113446156 B CN 113446156B
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pitch
pitch angle
variation
monitoring data
temperature
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CN113446156A (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

Abstract

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

Description

State monitoring method, device, equipment and medium of 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 running process of the wind generating set, once the variable pitch system fails, the wind generating set can be stopped in a failure mode. Because the pitch system is a set of complex system, a long time is needed from overhauling faults to recovering normal operation, the generating capacity of the wind generating set is reduced, and further economic loss is caused for enterprises.
In order to reduce economic loss, the existing method is to acquire a fault file of the wind generating set when the wind generating set is in fault shutdown, and then rapidly analyze the fault cause of the pitch system by using the operation data recorded by the fault file, thereby shortening the time for overhauling the fault.
However, the number of fault files of the wind generating set is small, and the method for analyzing the fault cause of the pitch system after the wind generating set is in fault shutdown can only analyze the fault cause, so that the occurrence of faults of the pitch system cannot be avoided, and economic losses still exist for enterprises.
Disclosure of Invention
The embodiment of the invention provides a state monitoring method, device, equipment and medium of a pitch system, which can monitor state parameters of target equipment in the pitch system, so as to avoid faults 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 time and second monitoring data of the variable pitch system at the previous time; the first monitoring data comprise a first pitch angle and a first pitch motor temperature, and the second monitoring data comprise a second pitch angle and a second pitch motor temperature;
calculating a pitch angle variation between the first pitch angle and the second pitch angle and a temperature variation between the first pitch motor temperature and the second pitch motor temperature;
determining state parameters of target equipment in the pitch system according to the pitch angle variation and the temperature variation; the target equipment is equipment for carrying out pitch control by matching with a pitch control motor in a pitch control system.
In a second aspect, an embodiment of the present invention provides a condition monitoring apparatus for a pitch system, including:
the first acquisition module is used for acquiring first monitoring data of the variable pitch system at the current time and second monitoring data of the variable pitch system at the previous time; the first monitoring data comprise a first pitch angle and a first pitch motor temperature, and the second monitoring data comprise a second pitch angle and a second pitch motor temperature;
The first calculation module is used for calculating the change amount of the pitch angle between the first pitch angle and the second pitch angle and the change amount of the temperature between the temperature of the first pitch motor and the temperature of the second pitch motor;
the parameter determining module is used for determining the state parameter of the target equipment in the pitch system according to the pitch angle variation and the temperature variation; the target equipment is equipment for carrying out pitch control by matching with a pitch control motor in a pitch control system.
In a third aspect, an embodiment of the present invention provides a condition monitoring apparatus for a pitch system, the apparatus comprising: a processor and a memory storing computer program instructions;
the processor when executing the computer program instructions implements a method for monitoring the 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 having stored thereon computer program instructions which, when executed by a processor, implement a method for monitoring a condition of a pitch system according to the first aspect.
According to the state monitoring method, device, equipment and medium of the pitch system, the change of the pitch angle and the change of the temperature 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 parameters of the target equipment matched with the pitch motor for pitch in the pitch system are determined according to the change of the pitch angle and the change of the temperature, so that the state parameters of the target equipment in the pitch system can be monitored based on the monitoring data of the pitch system, and faults related to the target equipment can be prevented from occurring in the pitch system based on the state parameters of the target equipment.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings that are needed to be used in the embodiments of the present invention will be briefly described, and it is possible for a person skilled in the art to obtain other drawings according to these drawings without inventive effort.
FIG. 1 is a schematic illustration of a pitch system provided in one embodiment of the present invention;
FIG. 2 is a flow chart of a method for monitoring a condition of a pitch system according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for monitoring a condition of a pitch system according to another embodiment of the present invention;
FIG. 4 is a flow chart of a method for monitoring the condition of a pitch system according to yet another embodiment of the present invention;
FIG. 5 is a schematic diagram of a condition monitoring apparatus for a pitch system according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a condition monitoring apparatus of a pitch system according to an embodiment of the present 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 the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and the detailed embodiments. It should be understood that the specific embodiments described herein are merely configured to illustrate the invention and are not configured to limit 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 invention by showing examples of the invention.
It is noted that relational terms such as first and second, and the like are 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. Moreover, 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 like elements in a process, method, article or apparatus that comprises the element.
In the running process of the wind generating set, once the variable pitch system fails, the wind generating set can be stopped in a failure mode. Since the pitch system is a complex set of systems, one failure of the pitch system may be caused by different reasons, for example, a "three axis angle inconsistency" failure of the pitch system, the cause of which may be any of the following: encoder trouble, encoder power failure, become oar system card oar, become oar driver trouble or become the collection module trouble of oar controller, consequently, to becoming the oar system, from overhauling the trouble to resume normal operating need longer time, reduced wind generating set's generated energy, and then cause economic loss for the enterprise.
In order to reduce economic loss, the existing method is to acquire a fault file generated by a pitch controller of a pitch system when a wind generating set is in fault shutdown, and then rapidly analyze the fault cause of the pitch system by using operation data recorded by the fault file, so that the time for overhauling the fault is shortened.
However, when data analysis is actually performed, it is found that, since the fault file is recorded and generated only after the wind generating set fails, for example, "fault record" records only the operation data of the first 30s and the second 30s of the failure of the wind generating set, so as to facilitate the analysis of the failure cause. If the wind driven generator set does not fail for a long time, no failure file is generated in the period of time.
Therefore, the state monitoring of the variable pitch system of the wind generating set cannot be performed by utilizing the fault file, and the method for analyzing the fault reason of the variable pitch system after the wind generating set is in fault shutdown cannot avoid the fault of the variable pitch system, so that the economic loss still exists for enterprises.
The data collection and monitoring control (Supervisory Control And Data Acquisition, SCADA) system can generate a monitoring data file every day, the time coverage is 24 hours, and the sampling time interval of the monitoring data file is too long, and a value is recorded in 5 s-7 s generally although the data volume can be ensured. For example, if the communication time between each wind generating set and the SCADA system is 100ms, and the number of wind generating sets in a single wind farm is 50, the communication time between all wind generating sets is 100ms×50=5000 ms=5 s, and at this time, a value can be recorded every 5 s.
From the technical route of data analysis, the shorter the sampling time interval is, the larger the recoverable information quantity is, and since the state change of each device of the wind generating set is very fast, if one data is collected every 5s-7s, the state of each device in the sampling time interval cannot be detected, the state fluctuation of each device is difficult to recover, 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 inconvenient.
In order to solve the problems in the prior art, the embodiment of the invention provides a state monitoring method, device, equipment and medium of a variable pitch system. The following first describes a state monitoring method, device, equipment and medium pitch system provided by the embodiment of the invention.
Fig. 1 shows a schematic structural diagram of a pitch system according to an embodiment of the present 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).
The pitch capacitor 101 may be a super capacitor, the pitch frequency converter 103 is used for controlling the pitch motor 102 to operate, the pitch charger 104 is used for charging the pitch capacitor 101 when the power grid input is normal, and the pitch controller 105 is used for controlling each device in the pitch system to operate.
With continued reference to fig. 1, the "+" output terminal of the pitch charger 104 is electrically connected to the "+" terminal of the pitch capacitor 101 and the "+" input terminal of the pitch frequency converter 103, respectively; the "-" output terminal of the pitch charger 104 is electrically connected to the "-" terminal of the pitch capacitor 101 and the "-" input terminal of the pitch frequency converter 103, respectively.
The working principle of the variable-pitch charger 104 is as follows: the pitch charger 104 monitors the voltage of the pitch capacitor 101 in real time and compares the voltage with a preset voltage; when the pitch system pitch, i.e., pitch motor 102 is running; when the voltage of the pitch capacitor 101 decreases due to energy consumption of the pitch motor 102, the pitch charger 104 starts to charge the pitch capacitor 101, and the charging process is a proportional-integral-derivative (PID) control process, where the input amount of the pitch charger 104 is a preset voltage, the feedback amount is an actual voltage of the pitch capacitor 101, and the output amount is a charging current.
And during the period that the pitch system does not pitch, the brake relay is in a band-type brake state, when the pitch system generates a pitch action, the brake relay can be opened into a brake release state until the pitch system stops pitch for more than 2 seconds, and the brake relay is in the band-type brake state again, so that one relay action is completed.
Fig. 2 shows a flow chart of a method for monitoring a state of a pitch system according to an embodiment of the present 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 as shown in fig. 1.
As shown in fig. 2, the method for monitoring the state of the pitch system may include:
s210, acquiring first monitoring data of a variable pitch system at the current time and second monitoring data of the variable pitch system at the previous time; the first monitoring data comprise a first pitch angle and a first pitch motor temperature, and the second monitoring data comprise a second pitch angle and a second 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 pitch motor and the temperature of the second pitch motor;
s230, determining state parameters of target equipment in the pitch system according to the pitch angle variation and the temperature variation; the target equipment is equipment for carrying out pitch control by matching with a pitch control motor in a pitch control system.
In the embodiment of the invention, the change amount of the pitch angle and the change amount of the temperature 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 of the pitch system at the previous moment, and the state parameters of the target equipment which is matched with the pitch motor to pitch in the pitch system are determined according to the change amount of the pitch angle and the change amount of the temperature, so that the state parameters 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 parameters of the target equipment.
In S210 of 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 generating set, and the state monitoring device may directly obtain the monitoring data of the pitch system needing to perform state detection, and extract, from the obtained monitoring data, first monitoring data of the pitch system needing to perform state detection at a current time and second monitoring data of the pitch system needing to perform state detection at a previous time.
In some embodiments of the present invention, in the case where the monitored data file is a history file, the current time may be the 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 the case where the monitored data file is a real-time file, the current time may be the latest sampling time in the monitored data file, and the last time may be the last 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 acquiring the monitoring data, before S210, the method for monitoring a state of the pitch system may further include:
a decentralized peripheral (Decentralized Periphery, DP) communication status word is acquired.
Accordingly, the specific method of S210 may include:
under the condition that the DP communication is normal according to the DP communication status word, acquiring first monitoring data of the variable pitch system at the current time and second monitoring data of the variable pitch system at the previous time.
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 of 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 pitch charger is in a normal working state can be determined based on the average charging current of the pitch charger, and whether the pitch capacitor is in the normal working state can be determined based on whether the average charging current exceeds the maximum charging current of the pitch capacitor, so that faults related to the pitch charger and the pitch capacitor of the pitch system are avoided. In addition, the average charging current of the pitch charger can also provide a reference for determining the capacitance parameter of the pitch capacitor to be replaced.
Further, the embodiment of the invention can calculate the average charging current of the variable-pitch charger between the current moment and the last moment, so that the charging current data corresponding to each time unit in the sampling time interval can be obtained, thereby increasing the charging current data of each time unit in the sampling time interval, namely increasing the process quantity of the charging current in the sampling time interval, reflecting the change process of the average charging current of the variable-pitch charger in the sampling time interval, further increasing the charging current data quantity for carrying out data analysis, and improving the quantization precision of the charging current statistics of the variable-pitch charger.
Fig. 3 is a schematic flow chart of a method for monitoring a state of a pitch system according to another embodiment of the present invention.
As shown in fig. 3, the method for monitoring the state of the pitch system may include:
s310, acquiring first monitoring data of a variable pitch system at the current time and second monitoring data of the variable pitch system at the previous time; the first monitoring data comprise a first pitch angle and a first pitch motor temperature, and the second monitoring data comprise a second pitch angle and a second 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 pitch motor and the temperature of the second pitch motor;
The principles of S310-S320 are similar to those of S210-S220 shown in fig. 2, and are not described here again;
s330, under the condition that the change amount of the pitch angle and the change amount of the temperature are non-zero, calculating the average pitch speed according to the change amount of the pitch angle;
s340, calculating the average torque of the variable-pitch motor according to the average variable-pitch speed;
s350, calculating the average charging current of the pitch charger according to the average torque.
In S330 of some embodiments of the invention, if the pitch angle change is non-zero, it is indicated that the pitch system is performing a pitch action. However, when communication between the wind turbine generator system and the SCADA system is interrupted and resumed for a short period of time, the angle value may be suddenly changed to 0 due to interruption of communication, and at this time, the pitch angle change amount is also non-zero, but in fact, the pitch system does not perform the pitch operation, and at this time, auxiliary detection may be performed by the temperature change amount, and if the pitch system does not perform the pitch operation, the pitch motor temperature will not change. Therefore, if the temperature of the pitch motor also changes, namely, the temperature change amounts are all non-zero, the pitch system is indicated to perform pitch action.
In S330 of some embodiments of the present invention, after determining that the pitch system performs a pitch action, the pitch angle change may be divided by the time interval between the current time and the previous time to calculate an average pitch speed.
In S340 of some embodiments of the present invention, an average rotational speed of the pitch motor may be calculated according to the average pitch speed, and then an average torque corresponding to the average rotational speed may be calculated according to a correspondence between the rotational speed and the torque.
In S350 of 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 pitch charger in the sampling time interval can be embodied, and further the charging current data quantity for data analysis is increased, so that the defects of long sampling time interval and less acquisition data of monitoring data are overcome, and therefore, the average value calculation is carried out on the charging current of the pitch charger through the operation characteristic of the pitch system, and higher detection accuracy can be achieved.
The process of S330-S350 will be described in detail below in connection with the operational characteristics of the pitch system.
Let v (unit is °/s) be the pitch speed when the blades controlled by the pitch system are pitched, the transmission ratio of the pitch system is a, the rotation speed of the pitch motor is n=v×a, the time required from the start of pitch to the completion of pitch (for example, the position of the blades reaches 89 degrees), the torque of the pitch motor is N, the power of the pitch motor is P, where the relationship among the torque N, the rotation speed N, and the power P of the pitch motor is:
P＝N*n/9550＝N*v*a/9550 (1)
then in time t, the mechanical work W of the pitch motor is performed 1 The method comprises the following steps:
W 1 ＝P*t/b/c (2)
wherein t can be acquired by a pitch controller, b is the power factor of the pitch motor, and is set according to motor parameters, generally 91%, and c is the efficiency of the pitch motor, and is also set according to motor parameters, generally 91%.
After the pitch motor of the pitch system is determined, the characteristics of the rotation speed and the torque of the pitch motor are also determined, and a characteristic curve of the rotation speed and the torque of the pitch motor can be obtained, wherein the torque is specifically the output torque of the pitch motor, and the corresponding relation between the rotation speed and the torque of the pitch motor is obtained based on the characteristic curve fitting of the rotation speed and the torque.
In the pitch process of the pitch system, the voltage of the pitch capacitor is changed from V 3 Down to V 4 Theoretical energy W of 2 The method comprises the following steps:
W 2 ＝0.5*C*(V 3 *V 3 -V 4 *V 4 ) (3)
wherein C is the calibrated capacitance value of the variable pitch capacitor, V 3 Is the rated voltage of the pitch capacitance.
When the power grid inputs voltage, the pitch charger can charge and supplement the pitch capacitor, so that the voltage of the pitch capacitor is maintained at rated voltage, and meanwhile, the pitch charger also needs to provide power for the operation of the pitch motor.
When the pitch system is used for pitch control, the charging voltage of the pitch charger is U, and the charging current is I, so that the energy W provided by the pitch charger is within the time t 3 The method comprises the following steps:
W 3 ＝U*I*t (4)
the energy provided by the variable-pitch charger is equal to the sum of the energy for maintaining the variable-pitch capacitor voltage, the energy consumption of the variable-pitch motor and the energy consumption of other devices, namely:
W 3 ＝W 1 +W 2 +W 4
U*I*t＝N*v*a*t/b/c/9550+0.5*C*(V 3 *V 3 -V 4 *V 4 )+W 4 (5)
wherein W is 4 For other devices consuming energy, other devices can be 24V devices in the pitch control cabinet, such as sensors of programmable logic controllers (Programmable Logic Controller, PLC), encoders, brake relays, proximity switches, and the like, W 4 The detection or calculation may be performed in an existing manner, and will not be described in detail herein.
In a shorter time, the voltage drop of the pitch capacitance is lower, so that the equation (5) can be simplified to obtain:
U*I*t＝N*v*a*t/b/c/9550+W 4 (6)
Therefore, according to the above formula, the average charging current of the pitch charger can be calculated according to the average pitch speed, the average torque, the time interval between the current time and the previous time, and the charging voltage.
Therefore, the method provided by the embodiment of the invention can be suitable for monitoring data files with different historical versions and different variables, and has strong applicability.
In another embodiment of the present invention, in order to improve the reliability of detection of the pitch motion, the first monitoring data may further include a first pitch capacitor voltage, and the second monitoring data may further include a second pitch capacitor voltage;
in these embodiments, optionally, before calculating the average pitch speed from the pitch angle variation in S330, the state monitoring method of the pitch system may include:
calculating the voltage variation between the first variable pitch capacitance voltage and the second variable pitch capacitance voltage;
accordingly, the specific method of calculating the average pitch speed according to the pitch angle variation in S330 may include:
When the voltage variation is non-zero, an average pitch speed is calculated from the pitch angle variation.
Under the condition that communication between the wind generating set and the SCADA system is interrupted and restored in a short time, the angle value may be suddenly changed to 0 due to interruption of the communication, at the moment, the change amount of the pitch angle is also non-zero, but the pitch system does not actually generate a pitch action, at the moment, if the temperature of a pitch motor is abnormal in detection, the change amount of the temperature may also change, therefore, the voltage change amount of the pitch capacitor voltage needs to be determined, and if the voltage change amount also changes, namely, the voltage change amount is non-zero, the pitch action of the pitch system is indicated.
In other embodiments of the invention, the target device may comprise a pitch charger and, correspondingly, 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 change of the pitch angle and the change of the temperature are non-zero, calculating the average current of the pitch motor according to the change of the temperature;
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 pitch charger according to the average torque.
Specifically, the average current of the variable-pitch motor corresponding to the temperature variation can be calculated directly according to the relation between heat and temperature, and then the mechanical work done by 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 done by the variable-pitch motor.
Wherein, the relation of heat and temperature is: heat = mass x heat capacity x temperature change, i.e. Q = CM (T2-T1), where Q is heat, C is mass of the object, M is heat capacity of the object (look-up table), T 2 Is the final temperature of the object, T 1 Is the initial temperature of the object, for a pitch motor,Q＝I 2 r is t, R is the coil resistance of the variable pitch motor, thus obtaining, I 2 ＝CM(T 2 T1)/R/T, wherein CM/R can be considered as a constant, and therefore the amount of temperature change 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 the 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 failure of the pitch control system caused by the failure of the brake relay is avoided.
Fig. 4 is a flow chart illustrating a method for monitoring a state of a pitch system according to still another embodiment of the present invention.
As shown in fig. 4, the method for monitoring the state of the pitch system may include:
s410, acquiring an automatic pitch period and a single-shaft pitch 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 pitch motor temperature, and the second monitoring data comprise a second pitch angle and a second 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 pitch motor and the temperature of the second pitch motor;
the principles of S420-S430 are similar to those of S210-S220 shown in fig. 2, and are not described here again;
s440, determining state parameters of target equipment in the pitch system according to the pitch angle variation and the temperature variation; the target equipment is equipment for carrying out pitch control by matching with a pitch motor in a pitch control system, and specifically comprises a brake relay, and the state parameters comprise the action times.
In S410 of some embodiments of the present invention, the automatic pitch cycle and the uniaxial pitch cycle 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 state monitoring method of the pitch system may include:
when the current time is the first time in the single-axis pitch cycle, the cumulative value of the number of operations is added to 1.
The single-shaft pitch cycle is a manual debugging cycle of the pitch system, and under the cycle, the brake relay only executes one-time brake release action, so that the brake relay is always kept in a brake release state in the whole manual debugging cycle, and is in a brake contracting state again after the manual debugging cycle is finished.
Therefore, when the current time is the first time in the single-axis pitch cycle, the number of times of operation may be increased by 1 based on the current integrated value of the number of times of operation, and when the current time is not the first time in the single-axis pitch cycle, the current integrated value of the number of times of operation is not changed.
In some embodiments of the invention, the first monitoring data may further include a first pitch motor rotational speed;
in these embodiments, optionally, the specific method of S440 may include:
Under the condition that the current moment is the moment when the rotating speed of the first pitch motor in the automatic pitch period is larger than the preset rotating speed and the first pitch angle is smaller than the preset pitch angle, adding 1 to the accumulated value of the action times;
and under the condition that the current moment is the moment when the rotating speed of the non-first pitch motor in the automatic pitch period is larger 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 change quantity of the pitch angle and the change quantity of the temperature.
Specifically, when the current moment is the moment when the first pitch motor rotating speed in the automatic pitch period is greater than the preset rotating speed and the first pitch angle is smaller than the preset pitch angle, the current moment is the moment when the wind generating set starts pitch control, and at the moment, the brake relay only executes one brake release action, and the brake relay can be increased by 1 time on the basis of the current accumulated value of the action times.
When the current time is the time when the rotation speed of the non-first pitch motor in the automatic pitch period is greater than the preset rotation speed and the first pitch angle is smaller than the preset pitch angle, the accumulated value of the action times can be updated according to the change amount of the pitch angle and the change amount of the temperature.
In some embodiments of the invention, the first monitoring data may further comprise a first wind speed and the second monitoring data may further comprise a second wind speed;
In these embodiments, optionally, before updating the cumulative value of the number of actions according to the pitch angle variation and the temperature variation, the state monitoring method of the pitch system may include:
calculating a 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 cumulative value of the number of actions according to the pitch angle variation and the temperature variation 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, the cumulative value of the number of operations is added to 1.
Therefore, according to the first wind speed, the wind speed variation, the pitch angle variation and the temperature variation at the current moment, whether the wind generating set generates the pitch variation or not can be comprehensively determined, and further whether the brake relay executes the brake release action or not is judged, if the first wind speed is smaller than or equal to any one of the rated wind speed, the pitch angle variation and the temperature variation and the wind speed variation is nonzero and the wind speed variation is positive, the wind generating set generates the pitch variation, the brake relay executes the brake release action once, and the number of times of the brake release action can be increased by 1 time on the basis of the current accumulated number of times of the action.
However, if the pitch angle change amount and the temperature change amount are non-zero, it is possible to determine that the wind turbine generator set is subjected to the pitching 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:
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;
accordingly, a specific method of updating the cumulative value of the number of actions according to the pitch angle variation and the temperature variation may include:
when the pitch angle deviation is positive, the cumulative value of the number of operations is added to 1.
Specifically, if the deviation amount of the pitch angle between the first pitch angle and the minimum value of the pitch angle is a positive number, the pitch angle is started once, the wind generating set generates a pitch changing action, the brake relay executes a brake releasing action once, and the number of the brake relay can be increased by 1 time on the basis of the current accumulated value of the action times.
In some embodiments, the pitch angle minimum may be 0 °. In other embodiments, the pitch angle minimum may also be set as desired, as may the preset pitch angle and rated wind speed.
In summary, the method provided by the embodiment of the invention can make up for the defect of incomplete and inaccurate data statistics caused by overlong sampling time interval of the monitoring data file, and enables the statistics value of the state parameters of the target equipment in the pitch system to be more accurate.
Fig. 5 shows a schematic structural diagram of a state monitoring device of a pitch system according to an embodiment of the present invention.
In some embodiments of the invention, the apparatus as shown in fig. 5 may be provided 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:
the first obtaining module 510 is configured to obtain first monitoring data of the 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 pitch motor temperature, and the second monitoring data comprise a second pitch angle and a second pitch motor temperature;
a first calculation module 520 for calculating a pitch angle variation between the first pitch angle and the second pitch angle and a temperature variation between the first pitch motor temperature and the second pitch motor temperature;
a parameter determination 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 control by matching with a pitch control motor in a pitch control system.
In the embodiment of the invention, the change amount of the pitch angle and the change amount of the temperature 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 of the pitch system at the previous moment, and the state parameters of the target equipment which is matched with the pitch motor to pitch in the pitch system are determined according to the change amount of the pitch angle and the change amount of the temperature, so that the state parameters 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 parameters of the target equipment.
In some embodiments of the invention, the target device comprises a pitch charger, and the state parameter comprises an average charging current;
wherein, the parameter determining module 530 may specifically be configured to:
under the condition that the change of the pitch angle and the change of the temperature are non-zero, calculating the average pitch speed according to the change of the pitch angle;
calculating the average torque of the variable-pitch motor according to the average variable-pitch speed;
and calculating the average charging current of the 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, the state monitoring device of the pitch system can further comprise:
the second calculation module is used for calculating the voltage variation between the first pitch capacitance voltage and the second pitch capacitance voltage before calculating the average pitch speed according to the pitch angle variation;
accordingly, the parameter determination module 530 may be specifically configured to:
when the voltage variation is non-zero, an average pitch speed is calculated from the pitch angle variation.
In other embodiments of the present invention, the target device includes a brake relay and the status parameter includes a number of actions;
wherein, the state monitoring device of the pitch system can further comprise:
the second acquisition module is used for acquiring an automatic pitch cycle and a single-shaft pitch cycle corresponding to the pitch system before acquiring the first monitoring data of the pitch system at the current time and the second monitoring data of the pitch system at the previous time;
accordingly, 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 cycle and the single-axis pitch cycle corresponding to the pitch system are acquired, the cumulative value of the action times is added by 1 when the current time is the first time in the single-axis pitch cycle.
In some embodiments of the invention, the first monitoring data further comprises a first pitch motor rotational speed;
wherein, the parameter determining module 530 may specifically be configured to:
under the condition that the current moment is the moment when the rotating speed of the first pitch motor in the automatic pitch period is larger than the preset rotating speed and the first pitch angle is smaller than the preset pitch angle, adding 1 to the accumulated value of the action times;
and under the condition that the current moment is the moment when the rotating speed of the non-first pitch motor in the automatic pitch period is larger 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 change quantity of the pitch angle and the change quantity of the temperature.
In some embodiments of the invention, the first monitoring data further comprises a first wind speed and the second monitoring data further comprises a second wind speed;
wherein, the state monitoring device of the pitch system can further comprise:
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 smaller than or equal to the rated wind speed before updating the accumulated value of the action times 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, the cumulative value of the number of operations is added to 1.
In some embodiments of the present invention, the third computing module may be further configured to:
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;
accordingly, the parameter determination module 530 may be further configured to:
when the pitch angle deviation is positive, the cumulative value of the number of operations is added to 1.
It should be noted that, the state monitoring device of the pitch system provided by 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 in order to avoid repetition, a detailed description is omitted here.
Fig. 6 shows a schematic structural diagram of a condition monitoring device of a pitch system according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a condition monitoring apparatus of a pitch system according to an embodiment of the present invention. A processor 601 may be included as well as a memory 602 storing computer program instructions.
In particular, the processor 601 may include a Central Processing Unit (CPU), or an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or may be configured as one or more integrated circuits that implement 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, magnetic tape, or universal serial bus (Universal Serial Bus, USB) Drive, or a combination of two or more of the above. The memory 602 may include removable or non-removable (or fixed) media, where appropriate. 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 particular embodiments, memory 602 includes Read Only Memory (ROM). 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, where appropriate.
Processor 601 implements the state monitoring method of any of the pitch systems of the above embodiments by reading and executing computer program instructions stored in memory 602.
In one example, the condition 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 to each other through a bus 610 and perform communication with each other.
The communication interface 603 is mainly used for implementing communication between each module, apparatus, unit and/or device in the embodiment of the present invention.
Bus 610 includes hardware, software, or both, that couples components of the condition monitoring device of the pitch system to each other. By way of example, and not limitation, the buses 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 the above. Bus 610 may include one or more buses, where appropriate. Although embodiments of the invention have been described and illustrated with respect to a particular bus, the invention contemplates any suitable bus or interconnect.
The state monitoring device of the pitch system can execute the state monitoring method of the pitch system in the embodiment of the invention, thereby realizing the state monitoring method and the device of the pitch system described with reference to fig. 2 to 5.
In addition, in combination with the method for monitoring the state of the pitch system in the above embodiment, the embodiment of the invention may be implemented by providing a computer readable storage medium. The computer readable storage medium has stored thereon computer program instructions; the computer program instructions, when executed by a processor, implement a method of condition monitoring of a pitch system according to any of the above embodiments.
It should be understood that the invention is not limited to the particular arrangements and instrumentality described above and shown in the drawings. For the sake of brevity, a detailed description of known methods is omitted here. 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 shown, and those skilled in the art can make various changes, modifications and additions, or change the order between steps, after appreciating the spirit of the present invention.
The functional blocks shown in the above-described structural block diagrams may be implemented in 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, a plug-in, a 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 over transmission media or communication links by a data signal carried in a carrier wave. A "machine-readable medium" may include any medium that can store or transfer information. Examples of machine-readable media include electronic circuitry, 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 the like. The code segments may be downloaded via computer networks such as the internet, intranets, etc.
It should also be noted that the exemplary embodiments mentioned in this disclosure 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, or may be performed in a different order from the order in the embodiments, or several steps may be performed simultaneously.
In the foregoing, only the specific embodiments of the present invention are described, and it will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the systems, modules and units described above may refer to the corresponding processes in the foregoing method embodiments, which are not repeated herein. It should be understood that the scope of the present invention is not limited thereto, and any equivalent modifications or substitutions can be easily made by those skilled in the art within the technical scope of the present invention, and they should be included in the scope of the present invention.

Claims (11)

1. A method for monitoring the condition of a pitch system, comprising:
acquiring first monitoring data of the variable pitch system at the current time and second monitoring data of the variable pitch system at the previous time; the first monitoring data comprise a first pitch angle and a first pitch motor temperature, and the second monitoring data comprise a second pitch angle and a second pitch motor temperature;
Calculating a pitch angle variation between the first pitch angle and the second pitch angle and a temperature variation between the first pitch motor temperature and the second pitch motor temperature;
determining a state parameter of target equipment in the pitch system according to the pitch angle variation and the temperature variation; the target equipment is equipment for carrying out pitch control by matching with a pitch control motor in the pitch control system;
the target equipment comprises a variable-pitch charger, and the corresponding state parameter is average charging current; the target device further comprises a brake relay, and the corresponding state parameter is the action times.
2. A method according to claim 1, wherein said determining a state parameter of a target device in the pitch system from the pitch angle variation and the temperature variation comprises:
under the condition that the pitch angle variation and the temperature variation are non-zero, calculating an 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 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 the voltage variation between the first variable pitch capacitance voltage and the second variable pitch capacitance voltage;
the calculating the average pitch speed according to the pitch angle variation comprises the following steps:
and calculating the average pitch speed according to the pitch angle variation under the condition that the voltage variation is non-zero.
4. The method of claim 1, wherein the acquiring the first monitored data of the pitch system at the current time and the second monitored data at the previous time is preceded by the method further comprising:
acquiring an automatic pitch cycle and a single-shaft pitch cycle corresponding to the pitch system;
the step of obtaining the first monitoring data of the variable pitch system at the current time and the second monitoring data of the variable pitch system at the previous time comprises the following steps:
and under the condition that the current moment belongs to the automatic pitch period, acquiring the first monitoring data and the second monitoring data.
5. The method of claim 4, wherein after the obtaining the automatic pitch cycle and the single axis pitch cycle corresponding to the pitch system, the method further comprises:
and when the current time is the first time in the single-shaft pitch cycle, 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;
wherein the determining a state parameter of a target device in the pitch system according to the pitch angle variation and the temperature variation comprises:
adding 1 to the accumulated value of the action times when the current moment is the moment when the rotating speed of the first pitch motor in the automatic pitch period is greater than the preset rotating speed and the first pitch angle is smaller than the preset pitch angle;
and updating the accumulated value of the action times according to the change amount of the pitch angle and the change amount of the temperature when the current moment is the moment when the rotating speed of the non-first pitch motor in the automatic pitch period is larger 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 monitoring data further comprises a first wind speed and the second monitoring data further comprises a second wind speed;
Before updating the accumulated value of the action times according to the pitch angle variation and the temperature variation, the method further comprises:
calculating a wind speed variation between the first wind speed and the second wind speed when the first wind speed is less than or equal to a rated wind speed;
wherein updating the accumulated value of the action times according to the pitch angle variation and the temperature variation comprises:
when either one of the pitch angle change amount and the temperature change amount is non-zero and the wind speed change amount is a positive number, the integrated value of the operation number is added by 1.
8. A method according to claim 7, wherein before updating the cumulative value of the number of actions based on the pitch angle change amount and the temperature change amount, the method further comprises:
calculating a pitch angle offset between the first pitch angle and a pitch angle minimum value when the first wind speed is greater than the rated wind speed;
wherein updating the accumulated value of the action times according to the pitch angle variation and the temperature variation comprises:
when the pitch angle deviation is positive, the cumulative value of the number of operations is added by 1.
9. A condition monitoring device for 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 pitch motor temperature, and the second monitoring data comprise a second pitch angle and a second pitch motor temperature;
a first calculation module for calculating a pitch angle variation between the first pitch angle and the second pitch angle and a temperature variation between the first pitch motor temperature and the second pitch motor temperature;
the parameter determining module is used for determining the state parameter of the target equipment in the pitch system according to the pitch angle variation and the temperature variation; the target equipment is equipment for carrying out pitch control by matching with a pitch control motor in the pitch control system, the target equipment comprises a pitch control charger, and the corresponding state parameter is average charging current; the target device further comprises a brake relay, and the corresponding state parameter is the action times.
10. A condition monitoring apparatus for a pitch system, the apparatus comprising: a processor and a memory storing computer program instructions;
The processor, when executing the computer program instructions, implements a method for monitoring the condition of a pitch system according to any one 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 condition monitoring of a pitch system according to any of claims 1-8.
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