CN114567127A - Common-bus multi-transmission variable-pitch motor driving device - Google Patents
Common-bus multi-transmission variable-pitch motor driving device Download PDFInfo
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- CN114567127A CN114567127A CN202111492263.5A CN202111492263A CN114567127A CN 114567127 A CN114567127 A CN 114567127A CN 202111492263 A CN202111492263 A CN 202111492263A CN 114567127 A CN114567127 A CN 114567127A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/21—Devices for sensing speed or position, or actuated thereby
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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
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/20—Wind motors characterised by the driven apparatus
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Multiple Motors (AREA)
Abstract
The invention provides a common-bus multi-transmission variable-pitch motor driving device, which aims to solve the problems of complex electrical structure, high cost and low practicability of a system in the prior art. The internal part of the device at least comprises a rectifying unit, a bus capacitor bank, a charging unit, a braking unit, a plurality of inversion units and control units of all units. The control system can receive the instruction of an upper control system, simultaneously control a plurality of inversion control units according to the instruction to realize synchronous output control of a plurality of motors, and realize the design concept of multi-transmission of a common bus. The force can be effectively balanced, and the problem of stress concentration is avoided; the multiple inversion units of the driving device can drive multiple pitch motors, the bearing of a single motor is small, and the output of other motors is improved when the single motor is abnormal, so that the safety of a pitch system can be ensured, and the reliability of the system is improved; the invention solves the problem of stress concentration of the blade root driving tooth of the long-blade wind turbine generator and also comprehensively considers the factors of maintainability, comprehensive cost and the like.
Description
Technical Field
The invention belongs to the field of variable pitch control systems of wind generating sets, and particularly relates to a common-bus multi-transmission variable pitch motor driving device.
Background
In order to reduce the electricity consumption cost of the wind generating set, the wind generating set on land or on the sea has the development trend of large megawatt capacity and long blades. In order to adapt to the design trend of a fan with large megawatts and long blades, the electric variable pitch control system realizes the control of the long blades by increasing the power of a variable pitch driver and the power of a driving motor. The problem of high load of large blades can be solved by increasing the driving capability of a variable pitch system, but the traditional single-drive output mode can cause stress concentration of a large gear of a blade root, high load of a single gear and easy fatigue damage due to long-term abrasion, so that the safe operation of the whole fan is endangered. Meanwhile, as the blades are longer and longer, the load is continuously increased, and a larger variable pitch motor cannot be accommodated in a limited space such as a fan hub; large torque motors tend to be more difficult to install and maintain in terms of volume and weight; under the condition that the self rotational inertia of the large-torque motor is large, the slow dynamic response of the output motor also influences the load of the whole machine. Therefore, a multi-transmission variable pitch motor driving device needs to be designed, and the problems of a large megawatt long-blade fan in the field of variable pitch control are solved. However, the application of the multi-transmission variable pitch motors also causes the complex electrical connection of the variable pitch motors, which is difficult to realize in practical engineering application, and the start-stop control among the motors needs additional low-voltage components, which is high in cost, and poor in economy and practicability.
For example, the "pitch control system for a wind turbine generator system" disclosed in chinese patent document, publication number "CN 102619682B", discloses a pitch control system for a wind turbine generator system, which includes: the variable-pitch speed reducer comprises a main controller, a plurality of sub-controllers, motors and variable-pitch speed reducers, wherein the main controller is connected with the plurality of sub-controllers through a communication bus, each blade corresponds to one sub-controller and at least two motors, and each motor drives one variable-pitch speed reducer; the main controller is used for calculating a variable pitch expected value of the blade according to the wind speed, the power of the generator and the rotating speed; and the slave controller drives the motor to drive the variable pitch speed reducer according to the variable pitch expected value, so that the blades are driven to change pitch. The variable-pitch control system with the structure adopts multi-motor drive, so that the system is complex in electrical structure, high in cost and low in practicability.
Disclosure of Invention
The invention provides a common-bus multi-transmission variable-pitch motor driving device, which aims to solve the problems of complex electrical structure, high cost and low practicability of a system in the prior art.
The solution of the present invention to the above problems is as follows:
the utility model provides a total generating line multi-drive becomes oar motor drive arrangement contains and is used for changing the power frequency alternating current of grid input into the rectifier unit of direct current, converts the direct current of rectifier unit output into the variable alternating current drive of frequency and amplitude and becomes the contravariant unit of oar motor operation, contains two at least contravariant units in the total generating line multi-drive becomes oar motor drive system, and the contravariant unit obtains the electricity from the rectifier unit through same generating line. The power frequency alternating current power supply input by the power grid forms a direct current link in the driving device after being rectified by the rectifying unit, and the direct current link is used as an input power supply of the post-stage charging unit and the inversion unit under the coordination of the bus capacitor. And the multiple inverter units sharing the bus output alternating current with variable frequency and amplitude through a PWM control technology to drive the variable pitch motor to operate as required. The common-bus multi-transmission integrated driving device is more simplified in the aspect of the overall electrical principle design of the variable pitch system, the start-stop control among the motors does not need special protection design of extra low-voltage components, and the synchronous control of the motors can be realized in the device, so that the comprehensive cost of the system level design is more economical;
preferably, the power supply system further comprises a charging unit, wherein the charging unit charges an external standby power supply by using the direct current output by the rectifying unit, and the external standby power supply is used for supplying power to the common-bus multi-transmission pitch motor driving system when the power frequency alternating current power supply is abnormal. The charging unit can charge an external standby power supply of the driving device, and meanwhile, the device is provided with a direct current input interface for the standby power supply to be used when the power frequency alternating current power supply is abnormal;
preferably, the braking unit is further included, and the braking unit maintains the bus voltage not to exceed a specified value in the speed reduction process of the pitch motor. When the driving device controls the variable-pitch motor to decelerate, energy generated by braking can pump up the bus voltage, and at the moment, the braking unit is required to be put into use to maintain the bus voltage not to exceed a specified value.
Preferably, each inverter unit controls one pitch control motor to work. Therefore, the blades are controlled by the motors, the multiple inverter units of the driving device can drive the multiple pitch motors, the single motor is small in bearing, the output of other motors is improved when the single motor is abnormal, the safety of a pitch system can be ensured, and the reliability of the system is improved; the single motor is small in specification and convenient to maintain, and meanwhile, the adaptive reduction gearbox is smaller and is easier to maintain;
preferably, the intelligent power supply further comprises a main control unit, and the main control unit controls the rectifying unit, the charging unit, the inverting unit and the braking unit through preset instructions. The main control unit receives the communication information, digital quantity information and analog quantity information of the upper controller at the same time by integrating the information fed back by each sub-control unit, gives a control command of each sub-unit, and feeds back the state of the driving device to the upper controller.
Preferably, the inversion unit further comprises an inversion control unit, the inversion control unit receives an instruction from the main control unit to control the inversion unit to work, monitors the state of the pitch motor, and feeds the state of the pitch motor back to the main control unit. The inversion control units can be multiple according to the number of the inversion units, namely the number of the inversion control units is corresponding to the number of the inversion units, and the inversion control units are communicated with the main control unit in a communication mode.
Preferably, the charging unit further comprises a charging control unit, and the charging control unit receives an instruction from the main control unit to control the operation of the charging unit, detects the state of the external standby power supply, and feeds the state of the external standby power supply back to the main control unit. The charging control unit is responsible for controlling the starting and stopping of the charging unit, and outputting current and voltage according to the command of the main control unit.
Preferably, the brake unit comprises a brake control unit, the brake control unit receives the instruction of the main control unit to control the operation of the brake unit, and the state information of the brake unit is detected and fed back to the main control unit. And the brake control unit controls the brake unit according to the command of the main control unit and is responsible for switching on and switching off the brake pipe.
This patent has following beneficial effect for prior art:
the plurality of inversion units of the driving device can drive the plurality of variable pitch motors, so that the force can be effectively balanced, and the problem of stress concentration is avoided; the multiple inversion units of the driving device can drive multiple pitch motors, the bearing capacity of a single motor is small, and the output of other motors is improved when the single motor is abnormal, so that the safety of a pitch system can be ensured, and the reliability of the system is improved;
the common-bus multi-transmission integrated driving device is more simplified in the aspect of the overall electrical principle design of the variable pitch system, the start-stop control among the motors does not need special protection design of extra low-voltage components, and the synchronous control of the motors can be realized in the device, so that the comprehensive cost of the system level design is more economical;
the multiple inversion units of the driving device can drive multiple pitch motors, the single motor is small in size and convenient to maintain, and meanwhile, the adaptive reduction gearbox is smaller and is easier to maintain;
the driving device controls a plurality of slave control units through a main control unit, and particularly the main control unit and a plurality of inverter control units are communicated simultaneously, so that the speed is higher, and the communication is more stable;
the common-bus multi-transmission driving device is high in integration level, and each subunit is reasonably configured according to the requirements of the variable pitch system, so that the system has technical and cost advantages compared with a multi-driving system formed by a plurality of traditional variable pitch drivers.
Drawings
FIG. 1 is a schematic diagram of a main loop principle of a common-bus multi-transmission pitch motor driving device.
FIG. 2 is a topological structure diagram of a control circuit of a common-bus multi-transmission pitch motor driving device.
In the figure, the main control unit 101, the rectification control unit 201, the inversion control unit 301, the charging control unit 501 and the braking control unit are respectively provided with a rectification unit 1, an inversion unit 2, a charging unit 4, an external backup power supply 5, a braking unit 6, a variable pitch motor 7 and a charging control unit 501.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings. The drawings and detailed description are only intended to illustrate the invention and are not intended to limit the scope of the invention and the claims.
Example (b):
as shown in fig. 1 and 2, the common-bus multi-transmission variable pitch motor driving device comprises a rectifying unit 1, an inverting unit 2, a charging unit 3 and a braking unit 5, wherein the rectifying unit 1 is used for converting power frequency alternating current input by a power grid into direct current, the rectifying unit further comprises a rectifying control unit 101, the rectifying control unit 101 receives an instruction from a main control unit to control the rectifying unit to work, and the power grid state information is fed back to the main control unit by monitoring the power grid state; the rectification control unit is responsible for controlling the work of the rectification unit according to the command of the main control unit, and comprises electrifying slow start, rectifying tube conduction angle control, rectifying tube closing and the like; the inversion unit 2 converts the direct current output by the rectification unit 1 into alternating current with variable frequency and amplitude, the variable pitch motor is driven to operate, the common-bus multi-transmission variable pitch motor driving system comprises at least two inversion units, and the inversion units 2 are all powered from the rectification unit through the same bus. Meanwhile, the inversion unit 2 is connected with the variable pitch motor 6, and the variable pitch motor 6 feeds the rotating speed information back to the inversion unit. The integrated driving system with the common bus and the multiple transmissions is more simplified in the aspect of the overall electrical principle design of the variable pitch system, the start-stop control among the multiple motors does not need special protection design of additional low-voltage components, and the synchronous control of the multiple motors can be realized in the device, so that the comprehensive cost of the system level design is more economical; the charging unit 5 charges an external standby power supply by using the direct current output by the rectifying unit, and the external standby power supply is used for supplying power to the common-bus multi-transmission variable pitch motor driving system when the power frequency alternating current power supply is abnormal. The brake unit 5 maintains the bus voltage not to exceed a specified value in the speed reduction process of the variable pitch motor. When the driving device controls the variable-pitch motor to decelerate, energy generated by braking can pump up the bus voltage, and at the moment, the braking unit is required to be put into use to maintain the bus voltage not to exceed a specified value. As shown in fig. 2, the structure of the control loop of the common-bus multi-transmission pitch motor driving system is shown, wherein the main control unit 7 controls the rectification control unit 101, the charging unit 301, the inverting unit 201 and the braking unit 501 through preset instructions. The main control unit receives the communication information, digital quantity information and analog quantity information of the upper controller at the same time by integrating the information fed back by each sub-control unit, gives a control command of each sub-unit, and feeds back the state of the driving device to the upper controller.
Diodes are arranged between the external backup power supply 7 and the direct-current bus and between the external backup power supply 7 and the charging unit, so that directional movement of current is guaranteed when the external backup power supply 7 supplies power to the direct-current bus and when the charging unit charges the external backup power supply 7.
When in work, the method is executed according to the following steps:
after the driving system is connected with a power grid, the main control unit 7 controls the rectification unit 1 to work through the rectification control unit 101, and the direct-current bus is charged to normal working voltage.
The main control unit 7 controls the charging unit to charge the external backup power source 4 through the charging control unit 301 until the external backup power source 4 is charged to a set value.
The main control unit 7 collects status information of each functional module of the device, such as backup power supply voltage, bus voltage, module temperature, motor speed and position, etc., through each sub-control unit.
When the main control unit 7 does not receive a command from the upper control system, the drive system is in a standby state.
After receiving a paddle angle position instruction given by the fan main control system through the communication interface, the main control unit 7 sends a control command to each inversion control unit 201 by combining with the collected current position information, and performs dynamic adjustment according to the state fed back by the inversion unit 2, and the inversion control units 201 wave according to the command of the main control unit 7 and respectively control the output of the inversion units 2. The plurality of inversion units 2 drive the plurality of variable pitch motors 6 to operate simultaneously, so that a common-bus multi-transmission system is formed.
In the running process of the variable pitch motor 6, energy generated in the starting, stopping, accelerating and decelerating processes of the variable pitch motor can be fed back to the direct current bus side through the inverter unit 2, so that the direct current bus voltage is pumped up, and when the bus voltage exceeds a certain value, the driving device can be damaged, so that the braking control unit 501 is required to perform braking discharge according to the command of the main control unit 7, and the bus voltage balance is maintained.
Under the condition of abnormal power supply of an external power grid of the device, when the voltage of the direct-current power supply provided by the rectifying unit 1 is lower than the voltage of the external backup power supply 4, the external backup power supply 4 can directly provide energy for the device for emergency use. When the power supply of the power grid is recovered to be normal, the external backup power source 4 can be charged through the charging unit 3 in the device.
The main control unit 7 monitors the state of the external accessories of the driving system in real time through a digital quantity interface and an analog quantity interface, and makes a control decision after comprehensively judging the internal and external states of the device. The external accessories include the pitch motor 6 and the external backup power supply 4.
The main control unit 7 controls the inversion units 2 to synchronously output current, the variable pitch motor 6 bears the balance, the stress balance of a variable pitch bearing can be realized, the stress of a single tooth is reduced, and the design purpose of the invention is achieved.
The above is only one embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The utility model provides a change oar motor drive arrangement with generating line multi-drive which characterized in that includes:
a rectifying unit: the power frequency alternating current converter is used for converting power frequency alternating current input by a power grid into direct current;
an inversion unit: the direct current output by the rectifying unit is converted into alternating current with variable frequency and amplitude to drive the pitch-variable motor to operate, the common-bus multi-transmission pitch-variable motor driving device comprises at least two inversion units, and the at least two inversion units are powered from the rectifying unit through the same bus.
2. The common-bus multi-transmission pitch motor driving device according to claim 1, further comprising:
a charging unit: and charging an external standby power supply by using the direct current output by the rectifying unit, wherein the external standby power supply is used for supplying power to the common-bus multi-transmission variable pitch motor driving system when the power frequency alternating current power supply is abnormal.
3. The common-bus multi-transmission pitch motor driving device according to claim 2, further comprising:
a brake unit: and maintaining the bus voltage not to exceed a specified value in the speed reduction process of the variable pitch motor.
4. The common-bus multi-transmission pitch motor driving device according to claim 1, wherein each inverter unit controls one pitch motor to work.
5. The common-bus multi-transmission variable pitch motor driving device according to claim 3, further comprising a main control unit, wherein the main control unit controls the rectifying unit, the charging unit, the inverting unit and the braking unit through preset instructions.
6. The common-bus multi-transmission pitch motor driving device according to claim 5, wherein the inverter unit further comprises an inverter control unit, the inverter control unit receives a command from the main control unit to control the inverter unit to work, monitors the state of the pitch motor, and feeds the state of the pitch motor back to the main control unit.
7. The common-bus multi-transmission pitch motor driving device according to claim 5, wherein the charging unit further comprises a charging control unit, the charging control unit receives an instruction of the main control unit to control the operation of the charging unit, detects the state of an external standby power supply, and feeds the state of the external standby power supply back to the main control unit.
8. The common-bus multi-transmission variable pitch motor driving device according to claim 5, wherein the brake unit comprises a brake control unit, the brake control unit receives an instruction from the main control unit to control the operation of the brake unit, and the detected state information of the brake unit is fed back to the main control unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111492263.5A CN114567127A (en) | 2021-12-08 | 2021-12-08 | Common-bus multi-transmission variable-pitch motor driving device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111492263.5A CN114567127A (en) | 2021-12-08 | 2021-12-08 | Common-bus multi-transmission variable-pitch motor driving device |
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| CN102042167A (en) * | 2010-12-15 | 2011-05-04 | 北京金风科创风电设备有限公司 | Pitch regulating device and wind driven generator |
| CN102312773A (en) * | 2010-06-29 | 2012-01-11 | 上海派恩科技有限公司 | Permanent magnetic direct-current brushless variable-pitch control system |
| CN102338032A (en) * | 2011-09-08 | 2012-02-01 | 江苏金风风电设备制造有限公司 | Electric blade-changing system of wind generating set |
| CN103558030A (en) * | 2013-10-24 | 2014-02-05 | 沈阳华创风能有限公司 | Electric variable pitch experimental platform of wind generating set |
| KR101466104B1 (en) * | 2013-11-11 | 2014-11-27 | 삼성중공업 주식회사 | System and method for pitch of wind power generator |
| CN205370848U (en) * | 2015-11-27 | 2016-07-06 | 西门子（中国）有限公司 | Wind -powered electricity generation becomes servo drive of oar system |
| CN106194583A (en) * | 2016-07-22 | 2016-12-07 | 三重型能源装备有限公司 | A kind of change oar electric supply installation and wind power generating set |
| CN110080942A (en) * | 2019-04-30 | 2019-08-02 | 固安华电天仁控制设备有限公司 | A kind of wind generating variable-propeller control system |
| CN214787802U (en) * | 2021-01-25 | 2021-11-19 | 许昌许继风电科技有限公司 | Integrated variable pitch driver |
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2021
- 2021-12-08 CN CN202111492263.5A patent/CN114567127A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102312773A (en) * | 2010-06-29 | 2012-01-11 | 上海派恩科技有限公司 | Permanent magnetic direct-current brushless variable-pitch control system |
| CN102042167A (en) * | 2010-12-15 | 2011-05-04 | 北京金风科创风电设备有限公司 | Pitch regulating device and wind driven generator |
| CN102338032A (en) * | 2011-09-08 | 2012-02-01 | 江苏金风风电设备制造有限公司 | Electric blade-changing system of wind generating set |
| CN103558030A (en) * | 2013-10-24 | 2014-02-05 | 沈阳华创风能有限公司 | Electric variable pitch experimental platform of wind generating set |
| KR101466104B1 (en) * | 2013-11-11 | 2014-11-27 | 삼성중공업 주식회사 | System and method for pitch of wind power generator |
| CN205370848U (en) * | 2015-11-27 | 2016-07-06 | 西门子（中国）有限公司 | Wind -powered electricity generation becomes servo drive of oar system |
| CN106194583A (en) * | 2016-07-22 | 2016-12-07 | 三重型能源装备有限公司 | A kind of change oar electric supply installation and wind power generating set |
| CN110080942A (en) * | 2019-04-30 | 2019-08-02 | 固安华电天仁控制设备有限公司 | A kind of wind generating variable-propeller control system |
| CN214787802U (en) * | 2021-01-25 | 2021-11-19 | 许昌许继风电科技有限公司 | Integrated variable pitch driver |
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