阅读说明：本技术 一种风电机组叶轮过速控制方法 (Over-speed control method for impeller of wind turbine generator ) 是由 张士龙 张伟 刘庆超 卢成志 于 2019-09-12 设计创作，主要内容包括：本发明公开了一种风电机组叶轮过速控制方法,风电机组叶轮过速控制装置包括检测风电机组叶轮速度的测点、风电机组叶轮速度前置器、风电机组叶轮速度判定部件、试验装置、通信线缆和交流电源；方法如下：检测风电机组叶轮速度的测点检测叶轮速度及变化速率信号并传输至风电机组叶轮速度前置器；风电机组叶轮速度前置器通过通信线缆将信号传输至风电机组叶轮速度判定部件；风电机组叶轮速度判定部件将检测风电机组叶轮速度的测点中同类测点通过三取二判断信号为“真”；风电机组叶轮速度判定部件收到叶轮过速速率高1值时,发出自动收浆的命令,作用于变桨系统；收到叶轮过速速率高2值或者叶轮速度达到安全链的叶轮过速模块定值时,触发逻辑出口。(The invention discloses a wind turbine generator impeller overspeed control method.A wind turbine generator impeller overspeed control device comprises a measuring point for detecting the speed of a wind turbine generator impeller, a wind turbine generator impeller speed pre-setter, a wind turbine generator impeller speed judgment part, a test device, a communication cable and an alternating current power supply; the method comprises the following steps: detecting an impeller speed and a change rate signal by a measuring point for detecting the speed of the wind turbine generator and transmitting the speed and the change rate signal to a wind turbine generator impeller speed pre-processor; the wind turbine generator impeller speed pre-positioning device transmits a signal to a wind turbine generator impeller speed judgment part through a communication cable; the wind turbine generator impeller speed judging component judges the same type of measuring points in the measuring points for detecting the speed of the wind turbine generator impeller to be true through a two-out-of-three judging signal; when the speed judgment part of the wind turbine generator impeller receives the value that the over-speed rate of the impeller is higher than 1, an automatic slurry receiving command is sent out to act on a variable pitch system; and triggering a logic outlet when the impeller overspeed rate is received to be higher than 2 or the impeller speed reaches the impeller overspeed module fixed value of the safety chain.)

1. A wind turbine generator impeller overspeed control method is characterized in that a wind turbine generator impeller overspeed control device comprises a measuring point (1) for detecting the speed of a wind turbine generator impeller, a wind turbine generator impeller speed pre-setter (2), a wind turbine generator impeller speed judging part (3), a testing device (4), a communication cable (5) and an alternating current power supply (6); the measuring point (1) for detecting the speed of the wind turbine generator impeller is arranged in front of the wind turbine generator impeller speed prepositioner (2), and the wind turbine generator impeller speed judging part (3) is arranged in the motor cabin control cabinet and is distributed in a row with other fan control cabinets; the testing device (4) is arranged behind the wind turbine impeller speed judging part (3), and the measuring point (1) for detecting the wind turbine impeller speed, the wind turbine impeller speed pre-positioning device (2), the wind turbine impeller speed judging part (3) and the testing device (4) are connected with the alternating current power supply (6) through a communication cable (5); the working method comprises the following steps:

1) a measuring point (1) for detecting the speed of the impeller of the wind turbine generator detects the speed and the change rate signal of the impeller;

2) a measuring point (1) for detecting the speed of the wind turbine generator impeller transmits detected impeller speed and change rate signals to a wind turbine generator impeller speed pre-processor (2);

3) the wind turbine generator impeller speed pre-positioning device (2) transmits a signal to the wind turbine generator impeller speed judging part (3) through a communication cable (5);

4) the wind turbine generator impeller speed judging part (3) judges that the same type of measuring points in the measuring points (1) for detecting the speed of the wind turbine generator impeller are true through a two-out-of-three judgment signal;

5) when receiving a value that the over-speed rate of the impeller is higher than 1, the wind turbine generator impeller speed judging component (3) sends an automatic slurry receiving command to act on a variable pitch system; when the impeller speed judgment part (3) of the wind turbine generator receives the impeller overspeed rate is higher than 2 or the impeller speed reaches the impeller overspeed module fixed value of the safety chain, a logic outlet is triggered;

6) the logical exits are:

firstly, quickly feathering blades of a wind turbine generator to a 90-degree position;

the generator of the wind turbine generator trips to be separated from the power grid;

thirdly, the wind turbine generator drifts to the opposite wind direction;

7) and when the fault signal in the measuring point (1) for detecting the speed of the impeller of the wind turbine generator is reset, the wind turbine generator is started again to be connected to the grid for power generation.

2. The method for controlling the overspeed of the wind turbine generator impeller according to claim 1, wherein a test device (4) is used to test whether the performance of the wind turbine generator impeller overspeed control device is in a good standby state.

3. The wind turbine generator set impeller overspeed control method according to claim 1, characterized in that a dual-channel design is applied: when the switch is turned to a test position 1, only a test 1 channel is communicated; when the switch is turned to a test position 2, only a test 2 channel is communicated; when the switch is switched to a 'normal position', the two channels are communicated, and the logic outlet can be triggered only when the two channels are communicated; allowing an important signal to be tested on line, before testing, turning a test switch to a test position, gradually triggering a fault signal in a measuring point (1) for detecting the speed of the wind turbine generator impeller, and verifying that each signal lamp in a wind turbine generator impeller speed judging part (3) is on; after the test, resetting the fault signals in all the measuring points (1) for detecting the speed of the impeller of the wind turbine generator, resetting the logic outlet, and turning the test switch to the normal position.

Technical Field

The invention relates to an over-speed control method for an impeller of a wind turbine generator, and belongs to the field of logic design of wind turbine generators.

Background

In recent years, the annual growth rate of global renewable energy utilization has reached 25%. The utilization of renewable energy will be dominated by the power industry, and the power generation proportion of non-hydraulic renewable energy will be expanded by two times. Statistically, the consumption of renewable energy in 2030 will exceed 22 hundred million t oil equivalents. Wind power generation is the most mature renewable energy power generation except hydroelectric power generation, and the installed capacity of the wind power generation accounts for the vast majority of the total installed capacity of the whole renewable energy power generation.

The wind generating set comprises a wind wheel and a generator; the wind wheel comprises blades, a hub, a reinforcing member and the like; it has the functions of wind driven blade rotation to generate electricity, generator head rotation, etc. The wind power generation power supply comprises a wind generating set, a tower frame for supporting the generating set, a storage battery charging controller, an inverter, an unloader, a grid-connected controller, a storage battery pack and the like.

The monitoring of the wind turbine is in the development stage while the wind turbine with complex equipment is rapidly developed.

The wind power control system comprises a field wind generating set control unit, a high-speed annular redundant optical fiber Ethernet, a remote upper computer operator station and the like. The control unit of the on-site wind generating set is the core of each fan control, and the functions of parameter monitoring, automatic power generation control, equipment protection and the like of the set are realized; each wind generating set is provided with an on-site HMI (human machine interface) to realize on-site operation, debugging and maintenance of the set; the high-speed ring-shaped redundant optical fiber Ethernet is a data highway of the system and transmits real-time data of a unit to an interface of an upper computer; the upper computer operator station is the operation monitoring core of the wind power plant, has the functions of complete unit state monitoring, parameter alarming, real-time/historical data recording and displaying and the like, and realizes the operation monitoring and operation of all units of the wind power plant by an operator in a control room.

The field control station of the wind power control system comprises: the system comprises a tower base main controller cabinet, an engine room control station cabinet, a variable pitch system, a converter system, a field touch screen station, an Ethernet switch, a field bus communication network, a UPS power supply, an emergency shutdown backup system and the like.

1. Control station of tower base

A tower control station, namely a main controller cabinet, is the core of wind turbine equipment control and mainly comprises a controller, an I/O module and the like. The controller hardware adopts a 32-bit processor, the system software adopts a strong real-time operating system, and various complex main control logics for operating the unit are communicated with the cabin controller cabinet, the variable pitch system and the converter system in real time through a field bus so as to enable the unit to operate in the optimal state.

The configuration of the controller adopts configuration software with rich functions and friendly interface, adopts a configuration mode conforming to IEC61131-3 standard, and comprises the following steps: function diagrams (FBD), instruction Lists (LD), sequential function blocks (SFC), ladder diagrams, structured texts and other configuration modes.

2. Cabin control station

The cabin control station collects signals such as temperature, pressure, rotating speed and environmental parameters measured by the unit sensor, the signals are communicated with the main unit control station through a field bus, the main controller controls the machine frame through the cabin to realize functions of yawing, cable releasing and the like of the unit, and in addition, various auxiliary motors, oil pumps and fans in the cabin are controlled to enable the unit to work in the best state.

3. Variable pitch system

The wind turbine generator set above the large MW level usually adopts a hydraulic pitch control system or an electric pitch control system. The pitch system is characterized in that a front-end controller controls a pitch driving device of 3 fan blades, the pitch driving device is an execution unit of a main controller, and CANOPEN is adopted to communicate with the main controller so as to adjust the pitch of the 3 blades to work in the optimal state. The variable pitch system is protected by a backup power system and a safety chain, and emergency shutdown under emergency working conditions is guaranteed.

4. Converter system

At present, a large-scale wind generating set generally adopts a high-power converter to realize conversion of power generation energy, and a converter system is communicated with a main controller through a field bus to realize regulation of the rotating speed, active power and reactive power of the set.

5. On-site touch screen station

The on-site touch screen station is an on-site operation station for unit monitoring, realizes functions of on-site parameter setting, equipment debugging, maintenance and the like of the wind turbine unit, and is an on-site upper computer operator station of a unit control system.

6. Ethernet exchanger (HUB)

The system adopts an industrial Ethernet switch to realize the connection of the controller, the field touch screen and the remote control center network of a single unit. The field cabinet is connected with the upper computer in the remote control room by a common twisted pair cable.

7. On-site communication network

The main controller has various field bus interfaces such as CANOPEN, PROFIBUS, MODBUS, Ethernet and the like, and can be configured according to the actual requirements of projects.

8. UPS power supply

The UPS is used for ensuring that the unit control system, the emergency protection system and the related execution unit supply power under the condition that the external power supply of the system is cut off.

The safety and reliability of the control system of the wind generating set are related to whether the wind generating set can generate power normally or not, and even affect the long-term safe and reliable operation of the wind power plant. The large-scale wind generating set adopts necessary means through the safety design of the control system, improves the reliability of the control system as much as possible, ensures that the system has no fault or few faults as much as possible, and repairs the system at the fastest speed after the fault occurs, so that the system can be recovered to work normally.

The wind turbine generator system has the advantages of large equipment, complex structure, various potential safety hazards and various potential safety hazards, and accidents such as tower falling of the wind turbine generator system caused by over-speed of the impeller of the wind turbine generator system occur for many times in recent years, so that an over-speed control method for the impeller of the wind turbine generator system is urgently needed to protect the wind turbine generator system.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a wind turbine generator impeller overspeed control method.

The technical scheme adopted by the invention for solving the problems is as follows: a wind turbine generator impeller overspeed control method is characterized in that a wind turbine generator impeller overspeed control device comprises a measuring point for detecting the speed of a wind turbine generator impeller, a wind turbine generator impeller speed pre-positioner, a wind turbine generator impeller speed judgment part, a test device, a communication cable and an alternating current power supply; the measuring point for detecting the speed of the wind turbine generator impeller is arranged in front of the wind turbine generator impeller speed prepositioner, and the wind turbine generator impeller speed judging part is arranged in the motor cabin control cabinet and is arranged in a row with other fan control cabinets; the testing device is arranged behind the wind turbine generator impeller speed judging component, data of a measuring point for detecting the wind turbine generator impeller speed and a wind turbine generator impeller speed pre-positioning device are input into the wind turbine generator impeller speed judging component, and the measuring point for detecting the wind turbine generator impeller speed and the wind turbine generator impeller speed pre-positioning device are connected with the wind turbine generator impeller speed judging component and the testing device through communication cables and an alternating current power supply.

Furthermore, the communication cable is in a soft-wired and hard-wired redundant design, so that the protection is more reliable.

Furthermore, the test device is designed in a cabin control cabinet of the wind turbine generator, the control loop is short, and the protection response is rapid.

The design purpose of the over-speed control device of the impeller of the wind turbine generator is as follows:

when the wind turbine generator runs abnormally, and the wind turbine generator control system cannot control the rotating speed of the wind turbine generator to run in a normal range, in order to prevent damage to the wind turbine generator, the wind turbine generator impeller overspeed control device enables the front-mounted slurry-arranging protection or tripping of the wind turbine generator (the wind turbine generator is arranged in a slurry-arranging mode quickly).

The function of the over-speed control device of the impeller of the wind turbine generator is as follows:

the system monitors the wind turbine's impeller speed and rate of change parameters, and when these parameters exceed their operational limits, will provide the following functions:

1) and under a dangerous working state, providing tripping logic for the wind turbine generator.

2) And under a dangerous working state, providing a feathering logic for the wind turbine generator.

3) When the starting condition of the wind turbine generator is determined, the wind turbine generator is manually reset in the centralized control room.

The working method comprises the following steps:

1) detecting an impeller speed and a change rate signal by a measuring point for detecting the impeller speed of the wind turbine;

2) a measuring point for detecting the speed of the wind turbine generator impeller transmits the detected speed and change rate signals of the impeller to a wind turbine generator impeller speed pre-processor;

3) the wind turbine generator impeller speed pre-positioning device transmits a signal to a wind turbine generator impeller speed judgment part through a communication cable;

4) the wind turbine generator impeller speed judging component judges the same type of measuring points in the measuring points for detecting the speed of the wind turbine generator impeller to be true through a two-out-of-three judging signal;

5) when the speed judgment part of the wind turbine generator impeller receives the value that the over-speed rate of the impeller is higher than 1, an automatic slurry receiving command is sent out to act on a variable pitch system; when the wind turbine generator impeller speed judging part receives that the impeller overspeed rate is higher than 2 or the impeller speed reaches the impeller overspeed module fixed value of the safety chain, triggering a logic outlet;

6) the logical exits are:

firstly, quickly feathering blades (three blades) of a wind turbine generator to 90-degree positions;

the generator of the wind turbine generator trips to be separated from the power grid;

thirdly, the wind turbine generator drifts to the opposite wind direction;

7) and when the fault signal in the measuring point for detecting the speed of the impeller of the wind turbine generator is reset, the wind turbine generator can be restarted to be connected to the grid for power generation.

Further, whether the performance of the over-speed control device of the impeller of the wind turbine generator is in a good standby state or not is tested by the testing device.

Further, a dual channel design is applied: when the switch is turned to a test position 1, only a test 1 channel is communicated; when the switch is turned to a test position 2, only a test 2 channel is communicated; when the switch is switched to a 'normal position', the two channels are communicated, and the logic outlet can be triggered only when the two channels are communicated; allowing an important signal to be tested on line, before testing, turning a test switch to a test position, gradually triggering a fault signal (analog signal) in a measuring point for detecting the speed of the wind turbine, and verifying that each signal lamp in a wind turbine impeller speed judging part is on; after the test, resetting fault signals (virtual signals) in all measuring points for detecting the speed of the impeller of the wind turbine generator, resetting a logic outlet, and turning a test switch to a normal position.

Furthermore, the test device tests once every year to ensure that the over-speed control device of the wind turbine generator impeller acts normally.

Compared with the prior art, the invention has the following advantages and effects:

1. the wind power generation system is complete in structure, compact in system, strong in practicability, suitable for being used in the wind power industry, and has operability, and practice proves that the method is a good method.

2. The method has scientificity, and can meet the requirement of protecting the wind turbine generator in case of danger.

3. Has the advantages of high sensitivity, visual and vivid result and the like.

4. The method has strong operability, indexes are reasonably based on scientific consideration, original data are convenient to obtain, and the method has operability.

5. The comparability is strong.

6. Has wide applicability.

Drawings

Fig. 1 is a schematic structural diagram of an overspeed control device for an impeller of a wind turbine generator in an embodiment of the invention.

In the figure: the device comprises a measuring point 1 for detecting the speed of the wind turbine, a wind turbine impeller speed pre-positioning device 2, a wind turbine impeller speed judging part 3, a testing device 4, a communication cable 5 and an alternating current power supply 6.

Detailed Description

The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.

Referring to fig. 1, in the present embodiment, the wind turbine generator impeller overspeed control device includes a measuring point 1 for detecting a wind turbine generator impeller speed, a wind turbine generator impeller speed pre-processor 2, a wind turbine generator impeller speed determination component 3, a test device 4, a communication cable 5, and an alternating current power supply 6; the measuring point 1 for detecting the speed of the wind turbine generator impeller is arranged in front of the wind turbine generator impeller speed prepositioner 2, and the wind turbine generator impeller speed judging part 3 is arranged in the motor cabin control cabinet and is distributed in a row with other fan control cabinets; the testing device 4 is arranged behind the wind turbine generator impeller speed judging component 3, data of the measuring point 1 for detecting the wind turbine generator impeller speed and the wind turbine generator impeller speed pre-positioning device 2 are input into the wind turbine generator impeller speed judging component 3, and the measuring point 1 for detecting the wind turbine generator impeller speed and the wind turbine generator impeller speed pre-positioning device 2 are connected with the wind turbine generator impeller speed judging component 3 and the testing device 4 through communication cables 5 and an alternating current power supply 6.

The action process is as follows:

1) detecting an impeller speed and a change rate signal by a measuring point 1 for detecting the impeller speed of the wind turbine;

2) a measuring point 1 for detecting the speed of the wind turbine generator impeller transmits detected impeller speed and change rate signals to a wind turbine generator impeller speed pre-processor 2;

3) the wind turbine generator impeller speed pre-positioning device 2 transmits a signal to a wind turbine generator impeller speed judgment part 3 through a communication cable 5;

4) the wind turbine generator impeller speed judgment part 3 judges that the same type of measuring points in the measuring points 1 for detecting the speed of the wind turbine generator impeller are true through a two-out-of-three judgment signal;

5) when receiving a value that the over-speed rate of the impeller is higher than 1, the wind turbine generator impeller speed judging component 3 sends an automatic slurry receiving command to act on a variable pitch system; when the impeller over-speed rate of the impeller is higher than 2 or the impeller speed reaches the impeller over-speed module fixed value of the safety chain, the wind turbine generator set impeller speed judging part 3 triggers a logic outlet;

6) the logical exits are:

a) blades (three) of the wind turbine generator set are quickly feathered to 90-degree positions;

b) meanwhile, the generator of the wind turbine generator trips to be separated from the power grid;

c) meanwhile, the wind turbine generator drifts to the opposite wind direction;

7) and when the fault signal in the measuring point 1 for detecting the speed of the impeller of the wind turbine is reset, the wind turbine can be started again to be connected to the grid for power generation.

The course of action ends.

The test procedure was as follows:

1) whether the performance of the over-speed control device of the wind turbine generator impeller is in a good standby state is tested through the testing device 4.

2) A dual channel design is applied: when the switch is turned to a test position 1, only a test 1 channel is communicated; when the switch is turned to a test position 2, only a test 2 channel is communicated; when the switch is switched to a 'normal position', the two channels are communicated, and the logic outlet can be triggered only when the two channels are communicated;

3) the over-speed control device of the wind turbine generator impeller allows an important signal to be tested on line, presses a function key of 'entering test', presses a 'confirm' key, and enters the test.

4) The function key to be tested (e.g., the overspeed 110 function key) is pressed.

5) Pressing either "channel 1" or "channel 2" selects the test channel.

6) And triggering a signal (analog signal) with a value 1 higher than the over-speed rate of the impeller in a measuring point 1 for detecting the speed of the impeller of the wind turbine generator.

7) And a signal lamp for judging the over-speed rate of the impeller of the wind turbine generator to be 1 is on in the impeller speed judging part 3.

8) After the test, a signal (virtual signal) with a value 1 higher than the over-speed rate of the impeller in a measuring point 1 for detecting the speed of the impeller of the wind turbine generator is recovered.

9) The test was completed.

10) The test switch is turned to the "normal" position.

The test procedure is ended.

And will be apparent to those skilled in the art from the foregoing description.

Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.