CN112065659B - Independent variable pitch control method and variable pitch comprehensive monitoring method and system for wind turbine generator - Google Patents
Independent variable pitch control method and variable pitch comprehensive monitoring method and system for wind turbine generator Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/40—Ice detection; De-icing means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses an independent pitch control method for a wind turbine generator, which comprises the following steps: monitoring current information of a variable pitch motor of the wind turbine generator in real time, and calculating load data of a single blade according to the detected current information and by combining the position state of the blade, the position state of an impeller and the running state information of a fan; and sending an instruction to the variable pitch driver by the main controller of the wind turbine generator according to the obtained load data of the single blade, so that the main controller of the wind turbine generator controls the single blade to finish independent variable pitch action. And the method and the system for comprehensively monitoring the independent variable pitch of the wind turbine generator are also disclosed. The invention utilizes the condition of collecting the electric drive current of the variable-pitch motor in real time, combines the relative position information of the impeller and the blade to carry out load calculation, has the function of carrying out motor load monitoring and identification on a single blade, is convenient to accurately realize the independent variable-pitch control of the blade, reduces the load of the unit and improves the efficiency of the unit. The invention also has the functions of blade damage diagnosis, blade icing monitoring, fan overspeed protection, fan vibration monitoring and environment monitoring.
Description
Technical Field
The invention relates to the technical field of wind power, in particular to an independent variable pitch control method and a variable pitch comprehensive monitoring method and system for a wind turbine generator.
Background
The variable pitch system is an important component of the wind turbine, is an 'adjusting switch' for energy input of the wind turbine, and has the performance directly influencing the safety performance of the wind turbine. With the large-scale wind turbine generator, the blades and the loads are larger and larger, and higher requirements are provided for the safety performance of a variable pitch system. The comprehensive monitoring of the state of the variable pitch system and related components of the low-wind-speed wind turbine generator is a key measure for ensuring the safety of the fan and improving the generating capacity. The existing variable pitch system has single function and cannot carry out comprehensive monitoring.
In addition, the traditional independent pitch control system (IPC) needs to know the stress conditions of the blades under different conditions, and the adopted method is as follows: the method has the problems of high equipment cost, short service life of a stress sensor, difficult maintenance and the like.
It can be seen that the above-mentioned existing independent pitch system still has inconvenience and disadvantages in structure, method and use, and further improvement is needed. How to create a new independent variable pitch control method and a new comprehensive variable pitch monitoring method and system for a wind turbine generator system, the method can simply, conveniently and inexpensively realize independent variable pitch control of a variable pitch system, can realize comprehensive monitoring in the aspects of blade damage, blade icing, hub overspeed, vibration protection, hub environment monitoring and the like, and greatly makes up the defects of the existing isolated variable pitch control.
Disclosure of Invention
The invention aims to provide an independent variable pitch control method for a wind turbine generator, which can simply and conveniently realize independent variable pitch control of a variable pitch system, is not influenced by the cost and the service life of a stress sensor, is quick and reliable and has low cost, thereby overcoming the defects of the conventional variable pitch system.
In order to solve the technical problem, the invention provides an independent pitch control method for a wind turbine generator, which comprises the following steps: monitoring current information of a variable pitch motor of the wind turbine generator in real time, and calculating load data of a single blade according to the detected current information and by combining the position state of the blade, the position state of an impeller and the running state information of a fan; and sending an instruction to a variable pitch driver by the main controller of the wind turbine generator according to the obtained load data of the single blade, so that the main controller of the wind turbine generator controls the single blade to finish independent variable pitch action.
In a further improvement, the method for calculating the load data of the single blade comprises the following steps: establishing an electromechanical coupling equation and a simulation model, loading different types of loads in the simulation model, obtaining a motor current time domain and frequency domain change rule under different types of load states, obtaining a corresponding relation between different types of loads and motor current, and obtaining load data of the single blade by using a current inverse solution method.
The invention also provides a comprehensive monitoring method for the variable pitch of the wind turbine generator, so that the comprehensive monitoring of the aspects of blade damage, blade icing, hub overspeed, vibration protection, hub environment monitoring and the like can be realized, and the defects of the existing isolated control of the variable pitch are overcome to a greater extent.
In order to solve the technical problem, the invention provides a comprehensive pitch-control monitoring method for a wind turbine generator, which is used for performing independent pitch control on three blades of the low-wind-speed wind turbine generator according to the independent pitch-control method for the wind turbine generator.
Further improved, the method also comprises a blade damage diagnosis method, wherein the blade damage diagnosis method comprises the following steps: calculating the stress condition of the blade according to the load data of the single blade calculated in the independent variable pitch control method of the wind turbine generator, comparing the obtained stress condition of the blade with the initial design load data and the initial load calibration data of the blade, judging whether the blade is in a normal state, and if not, judging that the blade is in a damaged state.
Further improvement, the blade icing monitoring method comprises the following steps: and calculating the stress condition of the blade according to the load data of the single blade calculated in the independent variable pitch control method of the wind turbine generator, comparing the obtained stress condition of the blade with the load data of the blade at the icing moment, and judging whether the blade is in an icing state.
The wind turbine generator system pitch control system is further improved, an independent rotation speed sensor is integrated, the rotation speed sensor is installed in a hub, the comprehensive pitch control monitoring method further comprises a fan overspeed monitoring method, and the fan overspeed monitoring method comprises the following steps: the variable pitch system acquires the rotating speed of the hub through the rotating speed sensor, compares the acquired rotating speed of the hub with a set rotating speed limit value, and judges whether the fan is overspeed or not.
The wind turbine generator system pitch control system is further improved, an independent acceleration sensor is integrated, the acceleration sensor is installed in a hub, the comprehensive pitch control monitoring method further comprises a fan vibration detection method, and the fan vibration detection method comprises the following steps: the variable pitch system collects the vibration condition of the hub through the acceleration sensor, compares the collected vibration information of the hub with a set limit value, and judges whether the fan is in a vibration abnormal state.
The comprehensive pitch control monitoring method is characterized in that the comprehensive pitch control monitoring method further comprises a fan environment detection method, wherein the fan environment detection method comprises the following steps: the variable pitch system collects temperature and humidity changes and dust content in the hub through the temperature and humidity sensor and the dust particle sensor, compares the collected temperature and humidity changes and dust content with a set limit value, and judges whether the inside of the fan is in a state of temperature and humidity and dust overrun.
The invention also provides a wind turbine generator system variable-pitch comprehensive monitoring system which comprises an independent variable-pitch control mechanism, a blade damage diagnosis mechanism and a blade icing monitoring mechanism;
the independent variable pitch control mechanism comprises a motor current signal acquisition module, a motor load calculation module and an independent variable pitch analysis module,
the motor current signal acquisition module is used for monitoring the current information of a variable pitch motor of the wind turbine generator in real time and transmitting the current information to the motor load calculation module;
the motor load calculation module is used for calculating load data of the blades according to the detected current information by combining the position state of the blades, the position state of the impeller and the running state information of the fan;
the blade damage diagnosis mechanism comprises a blade damage analysis module connected with the motor load calculation module and is used for calculating the stress condition of the blade according to the load data of a single blade obtained by the motor load calculation module, comparing the obtained stress condition of the blade with the initial design load data and the initial load calibration data of the blade and judging whether the blade is damaged or not;
the blade icing monitoring mechanism comprises a blade icing analysis module connected with the motor load calculation module and is used for calculating the stress condition of the blade according to the load data of a single blade obtained by the motor load calculation module, comparing the obtained stress condition of the blade with the load data of the blade at the icing moment and judging whether the blade is in an icing state or not.
Further improved, the system also comprises a fan overspeed monitoring mechanism, a fan vibration detection mechanism and a fan environment detection mechanism,
the fan overspeed monitoring mechanism comprises a rotating speed sensor and an overspeed analysis module connected with the rotating speed sensor, the rotating speed sensor is arranged in a hub and used for detecting the rotating speed of the hub in real time, and the overspeed analysis module is integrated in a variable pitch system and used for comparing the rotating speed of the hub collected in real time with a set rotating speed limit value and judging whether the fan is overspeed or not;
the fan vibration detection mechanism comprises an acceleration sensor and a vibration analysis module connected with the acceleration sensor, the acceleration sensor is arranged in a hub and used for detecting the vibration condition of the hub in real time, and the vibration analysis module is integrated in a variable pitch system and used for comparing the vibration condition of the hub collected in real time with a set limit value and judging whether the fan is in abnormal vibration or not;
the fan environment detection mechanism comprises a temperature and humidity sensor, a dust particle sensor and an environment analysis module connected with the temperature and humidity sensor and the dust particle sensor, wherein the temperature and humidity sensor and the dust particle sensor are installed in a hub and used for detecting temperature and humidity change and dust content in the hub in real time, the environment analysis module is integrated in a variable pitch system and used for comparing the collected temperature and humidity change and dust content with a set limit value and judging whether the inside of the fan is in a state that the temperature and humidity and the dust are out of limit or not.
After adopting such design, the invention has at least the following advantages:
1. the invention utilizes the condition of collecting the electric drive current of the variable pitch motor in real time, combines the information of the relative positions of the impeller and the blades and the like to carry out load calculation, has the functions of monitoring and identifying the electric load of a single blade, is convenient to accurately realize the independent variable pitch control of the three blades, reduces the load of a unit and improves the efficiency of the unit.
2. The invention also has the function of diagnosing blade damage, and can predict the structural damage of the blade so as to carry out corresponding maintenance and protection strategies.
3. The blade icing monitoring system also has a blade icing monitoring function, can perform early warning in the blade icing state, and protects the running safety of the fan.
4. The invention also has an independent overspeed protection function, and can carry out emergency propeller retracting under the condition of overspeed to protect the safety of the unit.
5. The invention also has the function of vibration monitoring, and the machine set is alarmed and stopped when the vibration of the machine set exceeds a designed alarm value so as to protect the safety of the machine set.
6. The invention also has an environment monitoring function, and performs alarm shutdown protection under the condition of worsening environmental conditions.
Drawings
The foregoing is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description.
FIG. 1 is a schematic structural principle diagram of a wind turbine generator pitch-control comprehensive monitoring system.
Detailed Description
In the variable-pitch motor of the low-wind-speed wind turbine generator, the change of the rotor load connected with the alternating current motor can be reflected in the air gap torque of the alternating current motor, and the fluctuation of the air gap torque can also cause the change of the stator current through the stator magnetic flux to cause the change of the electromagnetic coupling between the stator and the rotor, so that the running state information is reflected in the stator current signal. Therefore, the current is selected as an information source for load identification, quantitative identification of the motor load of the blade is achieved based on the motor current load online monitoring technology, and reliable guarantee is provided for accurate independent pitch control. The specific embodiment of the system and the method for comprehensively monitoring the variable pitch of the low-wind-speed wind turbine generator set is as follows.
Referring to the attached drawing 1, the wind turbine generator pitch-control comprehensive monitoring system of the embodiment includes an independent pitch-control mechanism, a blade damage diagnosis mechanism and a blade icing monitoring mechanism.
The independent variable pitch control mechanism comprises a motor current signal acquisition module, a motor load calculation module and an independent variable pitch analysis module. The motor current signal acquisition module is used for monitoring the current information of a variable pitch motor of the wind turbine generator in real time and transmitting the current information to the motor load calculation module; the motor load calculation module is used for calculating load data of the blades according to the detected current information and by combining the position state of the blades, the position state of the impeller and the running state information of the fan; the independent variable pitch analysis module is used for sending an instruction to the variable pitch driver through the main controller of the wind turbine generator set according to the load data of the single blade obtained by the motor load calculation module, so that the single blade is controlled by the independent variable pitch analysis module to finish independent variable pitch action.
The blade damage diagnosis mechanism comprises a blade damage analysis module connected with the motor load calculation module and used for calculating the stress condition of the blade according to the load data of a single blade obtained by the motor load calculation module, and then comparing the obtained stress condition of the blade with the initial design load data and the initial load calibration data of the blade to judge whether the blade is damaged.
The blade icing monitoring mechanism comprises a blade icing analysis module connected with the motor load calculation module and is used for calculating the stress condition of the blade according to the load data of a single blade obtained by the motor load calculation module, comparing the obtained stress condition of the blade with the load data of the blade at the icing moment and judging whether the blade is in an icing state or not.
In order to further improve the monitoring comprehensiveness of the wind turbine generator pitch-controlled comprehensive monitoring system, the system further comprises a fan overspeed monitoring mechanism, a fan vibration detection mechanism and a fan environment detection mechanism.
The fan overspeed monitoring mechanism comprises a rotating speed sensor and an overspeed analysis module connected with the rotating speed sensor, wherein the rotating speed sensor is arranged in a hub and used for detecting the rotating speed of the hub in real time; the overspeed analysis module is integrated in a variable pitch system and used for comparing the rotating speed of the hub collected in real time with a set rotating speed limit value and judging whether the fan is overspeed or not.
The fan vibration detection mechanism comprises an acceleration sensor and a vibration analysis module connected with the acceleration sensor, wherein the acceleration sensor is arranged in a hub and used for detecting the vibration condition of the hub in real time; the vibration analysis module is integrated in the variable pitch system and used for comparing the vibration condition of the hub acquired in real time with a set limit value and judging whether the fan is in abnormal vibration or not;
the fan environment detection mechanism comprises a temperature and humidity sensor, a dust particle sensor and an environment analysis module connected with the temperature and humidity sensor and the dust particle sensor, wherein the temperature and humidity sensor and the dust particle sensor are arranged in a hub and used for detecting temperature and humidity changes and dust content in the hub in real time; the environment analysis module is integrated in the pitch control system and used for comparing the collected temperature and humidity change and dust content with a set limit value and judging whether the inside of the fan is in a state of temperature and humidity and dust overrun.
When the wind turbine generator pitch-controlled comprehensive monitoring system is used for wind turbine generator pitch-controlled comprehensive monitoring, the control method comprises the following types:
independent pitch control method for wind turbine generator
The independent pitch control method of the wind turbine generator comprises the following steps: the method comprises the steps of monitoring current information of a variable pitch motor of the wind turbine generator in real time, and calculating load data of a single blade according to the detected current information and by combining a blade position state, an impeller position state and fan running state information.
The method for calculating the load data of the single blade comprises the following steps: establishing an electromechanical coupling equation and a simulation model, loading different types of loads in the simulation model, obtaining a motor current time domain and frequency domain change rule under different types of load states, obtaining a corresponding relation between different types of loads and motor current, and obtaining load data of the single blade by using a current inverse solution method.
And then according to the load data of each blade, the main controller of the wind turbine generator sends an instruction to the variable pitch driver, so that the main controller of the wind turbine generator controls the three blades of the low-wind-speed wind turbine generator to independently control the variable pitch.
Method for diagnosing damage of two wind turbine generator blades
The method for diagnosing the damage of the blades of the wind turbine generator comprises the following steps: and then comparing the obtained stress condition of the single blade with the initial design load data and the original load calibration data of the blade to judge whether the blade is in a normal state. If not, judging that the blade is in a damaged state, sending a blade damage alarm signal to a wind turbine main controller, and sending an instruction to a variable pitch driver by the wind turbine main controller so as to control the damaged blade to take in the blade.
Method for monitoring blade icing of three wind turbine generators
The method for monitoring the icing of the blades of the wind turbine generator comprises the following steps: and calculating the stress condition of the blade according to the load data of the single blade calculated in the independent variable pitch control method of the wind turbine generator, comparing the obtained stress condition of the blade with the load data of the blade at the icing moment, and judging whether the blade is in an icing state.
The load data of the blade at the icing moment can be obtained according to experience and system learning.
And if the blade is judged to be in the icing state, sending a blade icing alarm signal to the wind turbine main controller, and sending an instruction to the variable pitch driver by the wind turbine main controller to control the icing blade to perform a blade collecting action, so that subsequent strategies such as power reduction or shutdown deicing are facilitated.
Four-fan overspeed monitoring method
The method for monitoring the overspeed of the fan comprises the following steps: and collecting the hub rotating speed information of a rotating speed sensor integrated with a variable pitch system in the hub, comparing the collected hub rotating speed information with a set rotating speed limit value, and judging whether the fan is overspeed or not. If the overspeed is exceeded, a fan overspeed alarm signal is sent to a variable-pitch system of the wind turbine generator system, a variable-pitch driver controls the blades to complete a blade collecting action, and pneumatic braking is performed to protect the safe shutdown of the generator set.
Five-fan vibration detection method
The fan vibration detection method comprises the following steps: and acquiring the hub vibration condition of an acceleration sensor integrated with a variable pitch system in the hub, comparing the acquired hub vibration information with a set limit value, and judging whether the fan is in a vibration abnormal state. If the vibration is abnormal, a vibration abnormity alarm signal is sent to a variable-pitch system of the wind turbine generator system, and a variable-pitch driver controls the blades to complete a blade collecting action, so that the safe operation of the generator set is ensured.
Six-fan environment detection method
The fan environment detection method comprises the following steps: the temperature and humidity change and the dust content in the hub of the temperature and humidity sensor and the dust particle sensor integrated with the variable pitch system in the hub are collected, the collected temperature and humidity change and dust content are compared with set limit values, and whether the inside of the fan is in a state of temperature and humidity and dust overrun is judged. If the temperature and humidity conditions are abnormal or the dust content exceeds the standard, an alarm signal of the temperature and humidity conditions or the dust content exceeds the standard is sent to a pitch control system of the wind turbine generator, a pitch control driver controls the blades to complete a pitch collecting action, and shutdown maintenance is carried out.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the above description of the present invention can be applied to various modifications, equivalent variations or modifications without departing from the spirit and scope of the present invention.
Claims (9)
1. An independent pitch control method for a wind turbine generator is characterized by comprising the following steps: monitoring current information of a variable pitch motor of the wind turbine generator in real time, and calculating load data of a single blade according to the detected current information and by combining the position state of the blade, the position state of an impeller and the running state information of a fan; sending an instruction to a variable pitch driver by a main controller of the wind turbine generator according to the obtained load data of the single blade, so that the main controller of the wind turbine generator controls the single blade to finish independent variable pitch action;
the method for calculating the load data of the single blade comprises the following steps: establishing an electromechanical coupling equation and a simulation model, loading different types of loads in the simulation model, obtaining a motor current time domain and frequency domain change rule under different types of load states, obtaining a corresponding relation between different types of loads and motor current, and obtaining load data of the single blade by using a current inverse solution method.
2. The comprehensive monitoring method for the variable pitch of the wind turbine generator is characterized in that according to the independent variable pitch control method for the wind turbine generator of claim 1, three blades of the low-wind-speed wind turbine generator are controlled to be independently variable pitch.
3. The wind turbine generator pitch integrated monitoring method according to claim 2, further comprising a blade damage diagnosis method, wherein the blade damage diagnosis method is as follows: calculating the stress condition of the blade according to the load data of the single blade calculated in the independent variable pitch control method of the wind turbine generator, comparing the obtained stress condition of the blade with the initial design load data and the initial load calibration data of the blade, judging whether the blade is in a normal state, and if not, judging that the blade is in a damaged state.
4. The wind turbine generator pitch integrated monitoring method according to claim 3, further comprising a blade icing monitoring method, wherein the blade icing monitoring method comprises: and calculating the stress condition of the blade according to the load data of the single blade calculated in the independent variable pitch control method of the wind turbine generator, comparing the obtained stress condition of the blade with the load data of the blade at the icing moment, and judging whether the blade is in an icing state.
5. The wind turbine generator pitch integrated monitoring method according to claim 4, wherein an independent rotation speed sensor is integrated in a wind turbine generator pitch system, the rotation speed sensor is installed in a hub, the wind turbine generator pitch integrated monitoring method further comprises a fan overspeed monitoring method, and the fan overspeed monitoring method comprises the following steps: the variable pitch system acquires the rotating speed of the hub through the rotating speed sensor, compares the acquired rotating speed of the hub with a set rotating speed limit value, and judges whether the fan is overspeed or not.
6. The wind turbine generator pitch comprehensive monitoring method according to claim 5, wherein an independent acceleration sensor is integrated in a wind turbine generator pitch system, the acceleration sensor is installed in a hub, the wind turbine generator pitch comprehensive monitoring method further comprises a fan vibration detection method, and the fan vibration detection method comprises the following steps: the variable pitch system collects the vibration condition of the hub through the acceleration sensor, compares the collected vibration information of the hub with a set limit value, and judges whether the fan is in a vibration abnormal state.
7. The wind turbine generator pitch comprehensive monitoring method according to claim 6, wherein a wind turbine generator pitch system is integrated with an independent temperature and humidity sensor and a dust particle sensor, the temperature and humidity sensor and the dust particle sensor are installed in a hub, the wind turbine generator pitch comprehensive monitoring method further comprises a fan environment detection method, and the fan environment detection method comprises: the variable pitch system collects temperature and humidity changes and dust content in the hub through the temperature and humidity sensor and the dust particle sensor, compares the collected temperature and humidity changes and dust content with a set limit value, and judges whether the inside of the fan is in a state of temperature and humidity and dust overrun.
8. A wind turbine generator system variable-pitch comprehensive monitoring system is characterized by comprising an independent variable-pitch control mechanism, a blade damage diagnosis mechanism and a blade icing monitoring mechanism;
the independent variable pitch control mechanism comprises a motor current signal acquisition module, a motor load calculation module and an independent variable pitch analysis module,
the motor current signal acquisition module is used for monitoring the current information of a variable pitch motor of the wind turbine generator in real time and transmitting the current information to the motor load calculation module;
the motor load calculation module is used for calculating load data of the blades according to the detected current information by combining the position state of the blades, the position state of the impeller and the running state information of the fan; the method for calculating the load data of the single blade comprises the following steps: establishing an electromechanical coupling equation and a simulation model, loading different types of loads in the simulation model to obtain a motor current time domain and frequency domain change rule under different types of load states to obtain a corresponding relation between different types of loads and motor current, and obtaining load data of a single blade by using a current inverse solution method;
the independent variable pitch analysis module is used for sending a command to a variable pitch driver according to the load data of the single blade obtained by the motor load calculation module so as to control the single blade to complete independent variable pitch action;
the blade damage diagnosis mechanism comprises a blade damage analysis module connected with the motor load calculation module and is used for calculating the stress condition of the blade according to the load data of a single blade obtained by the motor load calculation module, comparing the obtained stress condition of the blade with the initial design load data and the initial load calibration data of the blade and judging whether the blade is damaged or not;
the blade icing monitoring mechanism comprises a blade icing analysis module connected with the motor load calculation module and is used for calculating the stress condition of the blade according to the load data of a single blade obtained by the motor load calculation module, comparing the obtained stress condition of the blade with the load data of the blade at the icing moment and judging whether the blade is in an icing state or not.
9. The wind turbine generator pitch integrated monitoring system according to claim 8, further comprising a fan overspeed monitoring mechanism, a fan vibration detection mechanism and a fan environment detection mechanism,
the fan overspeed monitoring mechanism comprises a rotating speed sensor and an overspeed analysis module connected with the rotating speed sensor, the rotating speed sensor is arranged in a hub and used for detecting the rotating speed of the hub in real time, and the overspeed analysis module is integrated in a variable pitch system and used for comparing the rotating speed of the hub collected in real time with a set rotating speed limit value and judging whether the fan is overspeed or not;
the fan vibration detection mechanism comprises an acceleration sensor and a vibration analysis module connected with the acceleration sensor, the acceleration sensor is arranged in a hub and used for detecting the vibration condition of the hub in real time, and the vibration analysis module is integrated in a variable pitch system and used for comparing the vibration condition of the hub collected in real time with a set limit value and judging whether the fan is in abnormal vibration or not;
the fan environment detection mechanism comprises a temperature and humidity sensor, a dust particle sensor and an environment analysis module connected with the temperature and humidity sensor and the dust particle sensor, wherein the temperature and humidity sensor and the dust particle sensor are installed in a hub and used for detecting temperature and humidity change and dust content in the hub in real time, the environment analysis module is integrated in a variable pitch system and used for comparing the collected temperature and humidity change and dust content with a set limit value and judging whether the inside of the fan is in a state that the temperature and humidity and the dust are out of limit or not.
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| CN112761872B (en) * | 2021-01-25 | 2022-11-01 | 三一重能股份有限公司 | Wind power variable pitch overspeed protection method and device and wind power variable pitch system |
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