CN105048496A - Grid-connected control method of dual-motor wind generating set - Google Patents
Grid-connected control method of dual-motor wind generating set Download PDFInfo
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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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Abstract
The invention discloses a grid-connected control method of a dual-motor wind generating set. The wind generating set comprises a first motor, a second motor and a transfer case. Two output shafts of the transfer case are connected with the first motor and the second motor respectively. The first motor is connected with a current transformer. The grid-connected control method comprises the following steps that when the first motor is connected to a grid, the current transformer adjusts the power of the first motor; when the first motor and the second motor are jointly connected to the grid, the current transformer adjusts rotation speeds of the two output shafts so as to adjust power distribution of the first motor and the second motor; and when the second motor is switched in or switched out, the current transformer adjusts the rotation speeds of the two output shafts, in order to enable the second motor to accord with switch-in or switch-out conditions. The invention is simple and reliable in control and easy to implement, and can achieve the best use of wind energy and the large power output of the set.
Description
Technical field
The present invention relates generally to technical field of wind power generation, specifically, relates to a kind of grid-connected control method of bi-motor wind turbine generator.
Background technology
In prior art, Large-scale Wind Turbines many employings magneto directly drives the structural shape of unit and asynchronous machine double-fed unit, and these two kinds of wind turbine generator all configure a generator.
Directly driven wind-powered unit wind wheel is directly connected with motor power shaft by shaft coupling, and generator speed changes with wind speed, and the AC rectification of frequency change is direct current by current transformer, and another mistake becomes the alternating current with electrical network same frequency.This unit is owing to need adopt multistage low-speed permanent-magnet motor, and along with the increase of unit design capacity, bring difficulty to design of electrical motor, processing and manufacturing, and need full power convertor, equipment investment is large.
Double-fed fan motor unit wind wheel is connected with motor power shaft by booster engine, and allow generator to run in upper and lower 30% scope of synchronous speed, when underrun, power coefficient is low, and unit efficiency is low.
In addition, because unit air-flow angle of attack to blade in whole service wind speed range is in continuous change, if the rotating speed of wind turbine generator can not adjust with the change of wind speed, the efficiency of impeller when low wind speed just must be made to reduce (if best efficiency point to be arranged on low wind speed district, then blade can be made to enter stall conditions too early).
For solving efficiency during low wind speed, some fixed pitch wind turbine generator adopts double speed generator (two armature generator), low speed winding generating during low wind speed, high speed winding generating during high wind speed.
Along with the appearance of the bi-motor wind turbine generator of various structure and type of attachment, as how low cost realizes the collaborative work between two motors, and the power division solved between two motors and cutting-in control problem, improve power coefficient, become the technical problem that those skilled in the art are urgently to be resolved hurrily.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of grid-connected control method of bi-motor wind turbine generator, the defect of two motor collaborative work difficulties in prior art can be solved.
The grid-connected control method of bi-motor wind turbine generator of the present invention, described wind turbine generator comprises the first motor, the second motor and transfer case, two output shafts of described transfer case connect described first motor and the second motor respectively, described first motor connects current transformer, and described grid-connected control method comprises the following steps:
When first motor is grid-connected, the power of described first motor of described current transformer adjustment;
First motor and the second motor common grid-connected time, the rotating speed of described two output shafts of described current transformer adjustment, to adjust the power division of described first motor and the second motor;
Second motor is cut or when cutting out, the rotating speed of described two output shafts of described current transformer adjustment, makes described second motor meet incision or cut out condition.
Further, the first motor and the second motor common grid-connected time, comprise the following steps:
Controlling described current transformer makes the first motor to carry out invariable power work lower than rated power, the second motor self adaptation wind speed;
When the second motor reaches rated power, the second motor carries out invariable power work with rated power, and the first motor self adaptation wind speed, until reach the rated power of unit.
Further, describedly 50% of rated power is specially lower than rated power.
Further, the first motor and the second motor common grid-connected time, control described current transformer and the ratio of the power of the first motor and the second motor fixed, until reach the rated power of unit.
Further, the first motor and the second motor common grid-connected time, control described current transformer and make the first motor with the work of rated power invariable power, described second motor self adaptation wind speed, until reach the rated power of unit.
Further, also comprise step: when reaching the rated power of unit, by pitch-controlled system adjustment unit propeller pitch angle.
Further, also comprise step: when wind speed reaches unit cut-out wind speed, by pitch-controlled system adjustment unit propeller pitch angle, and first control the second motor and cut out, then control the first motor and cut out.
Further, after the first motor and the second motor all cut out, the pitch angle of adjustment pitch-controlled system is 90 degree, and yaw system adjustment wind wheel crosswind, unit safety is shut down.
Further, also comprise the step detecting unit whether fault, if described first motor or current transformer fault, described second motor works alone; If described second electrical fault, described first motor works alone.
Further, when described second motor works alone, by pitch-controlled system adjustment unit propeller pitch angle, described second motor is made to meet incision or cut out condition.
The grid-connected control method of bi-motor wind turbine generator of the present invention, adopt two cover electricity generation systems, the power of the assembling unit equals the first power of motor, the second power of motor sum.When low wind speed, the first electrical motor gearshift work, makes wind wheel be operated in rotating speed corresponding to the maximum usage factor of wind energy by current transformer adjustment electromagnetic torque, improves wind energy utilization and unit efficiency; When high wind speed, adjust the power division of the first motor and the second motor by current transformer.Grid-connected control method of the present invention can realize the high-power output of unit, and controls simple and reliable, easy to implement.
In addition, the present invention can also the first motor and the second motor common grid-connected time, adopt predetermined power pattern, the first motor rated power pattern and ratio to distribute the methods of salary distribution such as power mode, to be adapted to the wind power generation environment of zones of different, improve wind energy utilization and unit efficiency.
Further, the present invention also can comprise normal mode of operation and fail operation pattern, and the first motor and the second motor all can Independent Power Generations, wherein during an electricity generation system fault, do not affect unit generation, improves unit generation hourage.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of the bi-motor wind turbine generator breakdown judge of one embodiment of the invention;
Fig. 2 is the generator operation flow chart of bi-motor wind turbine generator when fault mode of one embodiment of the invention;
Fig. 3 is the flow chart of the bi-motor wind power generation set grid-connection of one embodiment of the invention;
Fig. 4 is the flow chart of the bi-motor wind turbine generator off-grid of one embodiment of the invention;
Fig. 5 is the generator operation flow chart of the bi-motor wind turbine generator of one embodiment of the invention;
Fig. 6 a is the power diagram of predetermined power pattern of the present invention;
Fig. 6 b is the power diagram of the present invention first motor rated power pattern;
Fig. 6 c is the power diagram of ratio power allocation pattern of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
In the present invention, term " first ", " second " are mainly used in distinguishing different parts, but specifically do not limit parts.The present invention's motor everywhere refers to generator.
Grid-connected control method of the present invention is used in bi-motor wind turbine generator, this bi-motor wind turbine generator comprises the first motor, the second motor and transfer case, two output shafts of transfer case connect the first motor and the second motor respectively, and the first motor connects current transformer.In each embodiment shown in Fig. 1-6, the first motor corresponds to magneto, and the second motor corresponds to induction machine.
Should be clear, aforementioned first motor and the second motor can adopt polytype motor, and as the first motor can be permagnetic synchronous motor or double fed asynchronous machine, the second motor can be squirrel-cage motor; In addition, also the first motor can be replaced with squirrel-cage motor, the second motor is replaced with permagnetic synchronous motor, or other possibility mode, include within technical scheme of the present invention.
Aforementioned transfer case can play accelerating function.In addition, as required, this bi-motor wind turbine generator also can comprise bi-motor grid-connection control system, bypass contactor, soft lifting device, grid-connected circuit breaker, reactive power compensator, Crowbar etc.Bi-motor grid-connection control system, according to system requirements, can be integrated in wind turbine generator master control or Variable flow control system, or adopts other possibility.Bypass contactor, soft lifting device, grid-connected circuit breaker, reactive power compensator configure on demand according to the second motor, and Crowbar needs configuration by system.
Grid-connected control method of the present invention comprises the following steps:
When first motor is grid-connected, current transformer adjusts the power of the first motor;
First motor and the second motor common grid-connected time, current transformer adjusts the rotating speed of two output shafts, to adjust the power division of the first motor and the second motor;
Second motor cuts or when cutting out, current transformer adjusts the rotating speed of two output shafts, makes the second motor meet incision or cut out condition.
Each step is by imbody in the description of Fig. 1-6 above.Due to current transformer both adjustable first motor, adjustable second motor again, the variable-speed operation being achieved relatively high power by the current transformer of smaller power is controlled, and significantly reduces system cost relative to prior art; Because small-power converter topology is ripe, thus low, the good reliability of manufacture difficulty.
The present invention is owing to adopting two cover electricity generation systems, and the power of the assembling unit equals the first power of motor, the second power of motor sum.When low wind speed, the first electrical motor gearshift work, makes wind wheel be operated in rotating speed corresponding to the maximum usage factor of wind energy by current transformer adjustment electromagnetic torque, improves wind energy utilization and unit efficiency; When high wind speed, adjust the power division of the first motor and the second motor by current transformer.Grid-connected control method of the present invention can realize the high-power output of unit, and controls simple and reliable, easy to implement.
Be the flow chart of the bi-motor wind turbine generator breakdown judge of one embodiment of the invention shown in Fig. 1, the step of this detection unit whether fault belongs to a part for grid-connected control method, if the first motor or current transformer fault, the second motor works alone; If the second electrical fault, the first motor works alone.In addition, when the second motor works alone, by pitch-controlled system adjustment unit propeller pitch angle, the second motor is made to meet incision or cut out condition.
Because this embodiment comprises normal mode of operation and fail operation pattern, the first motor and the second motor all can Independent Power Generations, wherein during an electricity generation system fault, do not affect unit generation, improve unit generation hourage.Fig. 2 is the generator operation flow chart of bi-motor wind turbine generator when fault mode of one embodiment of the invention, and the concrete course of work is described as follows:
Magneto (the first motor) Independent Power Generation pattern
A) when wind speed be greater than unit incision wind speed be less than unit cut-out wind speed time, pitch-controlled system regulate propeller pitch angle;
B) make magneto raising speed by adjustment propeller pitch angle, when magneto rotating speed reaches generating rotating speed, magneto generates electricity by way of merging two or more grid systems;
C) when magneto does not reach rated output power, wind wheel is made to be operated in rotating speed corresponding to the maximum usage factor of wind energy by current transformer adjustment magneto electromagnetic torque;
D) when magneto reaches rated output power and do not reach unit cut-out wind speed, by pitch-controlled system adjustment unit propeller pitch angle, magneto generates electricity with rated power;
E) when wind speed is greater than unit cut-out wind speed, reduce unit input power by pitch-controlled system, reduce magneto power, when close to magneto minimum speed, magneto off-grid; Continuing adjustment pitch angle is 90 degree, and yaw system adjustment wind wheel crosswind, unit safety is shut down.
Induction machine (the second motor) Independent Power Generation pattern
A) incision wind speed when wind speed is greater than induction machine independent working mode and be less than unit cut-out wind speed, pitch-controlled system regulates propeller pitch angle;
B) make induction machine raising speed by adjustment propeller pitch angle, induction machine close to during synchronous speed soft grid-connected, by the soft lifting device of contactor bypass when reaching synchronous speed, complete induction machine grid-connected;
C) when induction machine reaches rated output power and do not reach unit cut-out wind speed, by pitch-controlled system adjustment unit propeller pitch angle, induction machine generates electricity with rated power;
D) when wind speed is greater than unit cut-out wind speed, reduce unit input power by pitch-controlled system, reduce induction machine power, when close to induction machine synchronous speed, magneto off-grid; Continuing adjustment pitch angle is 90 degree, and yaw system adjustment wind wheel crosswind, unit safety is shut down.
When bi-motor wind turbine generator two overlap electricity generation system all normal time, unit is operated in normal mode of operation, Fig. 3-Fig. 5 is the flow chart of the grid-connected control method in normal mode of operation, it is wherein the grid-connected stage started shown in Fig. 3, be the off-grid stage terminated shown in Fig. 4, Fig. 5 is the middle generator operation stage.Be specially following steps:
1) when wind speed be greater than unit incision wind speed be less than unit cut-out wind speed time, pitch-controlled system regulate propeller pitch angle;
2) when magneto rotating speed reaches generating rotating speed, magneto generates electricity by way of merging two or more grid systems, and system enters magneto and to generate electricity by way of merging two or more grid systems pattern;
3) when magneto does not reach rated output power, make wind wheel be operated in rotating speed corresponding to the maximum usage factor of wind energy by current transformer adjustment magneto electromagnetic torque, magneto electricity generation system variable speed constant frequency works;
4) when magneto power output reaches rated power, and under reaching unit normal mode of operation during the grid-connected wind speed of induction machine, induction machine raising speed is made by regulating magneto electromagnetic torque, when induction machine rotating speed is close to synchronous speed, soft of induction machine, when reaching synchronous speed, the soft lifting device of bypass, complete the cutting-in control of induction machine, system enters magneto and induction machine and jointly to generate electricity by way of merging two or more grid systems pattern;
5) magneto and induction machine generate electricity by way of merging two or more grid systems and jointly when wind speed is less than induction machine cut-out wind speed under unit normal mode of operation, magneto electromagnetic torque is regulated to make induction machine reduction of speed fall power by current transformer, at induction machine rotating speed close to off-grid during synchronous speed, system enters magneto Independent Power Generation;
6) when magneto and induction machine all reach rated output power and do not reach unit cut-out wind speed, by pitch-controlled system adjustment unit propeller pitch angle, magneto, induction machine generate electricity with rated power;
7) when wind speed is greater than unit cut-out wind speed, reduce unit input power by pitch-controlled system, reduce induction machine power output, when close to synchronous speed, induction machine off-grid; Continue through pitch-controlled system and reduce unit input power, reduce magneto power, when close to magneto minimum speed, magneto off-grid; Continuing adjustment pitch angle is 90 degree, and yaw system adjustment wind wheel crosswind, unit safety is shut down.
Aforementioned first motor and the second motor common grid-connected time, multiple possible power allocation pattern can be adopted, the present invention preferably adopts Three models, be respectively predetermined power pattern, the first motor rated power pattern and ratio and distribute power mode, to be adapted to the wind power generation environment of zones of different, improve wind energy utilization and unit efficiency.
Fig. 6 a is the power diagram of predetermined power pattern of the present invention, the first motor and the second motor common grid-connected time, comprise the steps:
Controlling current transformer makes the first motor to carry out invariable power work lower than rated power, the second motor self adaptation wind speed;
When the second motor reaches rated power, the second motor carries out invariable power work with rated power, and the first motor self adaptation wind speed, until reach the rated power of unit.Preferably aforementionedly be specially 50% of rated power lower than rated power.
More specifically, the power diagram shown in Fig. 6 a is described in detail as follows:
1) wind speed reaches unit incision wind speed V0, and magneto generates electricity by way of merging two or more grid systems;
2) when magneto does not reach rated output power (wind speed is in V0 ~ V2 scope), wind wheel is made to be operated in rotating speed corresponding to the maximum usage factor of wind energy by current transformer adjustment electromagnetic torque, magneto electricity generation system variable speed constant frequency work, as the curve in Fig. 6 a (1);
3) magneto reaches rated power, and under reaching unit normal mode of operation during the grid-connected wind speed of induction machine, induction machine raising speed is made by regulating magneto electromagnetic torque, when induction machine rotating speed is close to synchronous speed, soft of induction machine, when reaching synchronous speed, the soft lifting device of bypass, complete the cutting-in control of induction machine, system enters magneto and induction machine and jointly to generate electricity by way of merging two or more grid systems pattern; Magneto reduces load to 50% of rated power by given power curve, and induction machine increases load to 50% of rated power, as magneto power curve in Fig. 6 a (2), induction machine power curve is (3);
4) when induction machine does not reach rated output power (wind speed is in V2 ~ V3 scope), the (4) Variable power operation of Fig. 6 a curve pressed by induction machine, and Fig. 6 a curve (5) output-constant operation pressed by magneto;
5) when induction machine reaches rated output power (wind speed is in V3 ~ V4 scope), Fig. 6 a curve (6) rated power operation pressed by induction machine, and the (7) Variable power operation of Fig. 6 a curve pressed by magneto;
6) when induction machine and magneto all reach rated output power (wind speed is in V4 ~ V5 scope), Fig. 6 a curve (8) output-constant operation pressed by magneto and induction machine;
7) when wind speed is greater than unit cut-out wind speed V5, set pitch control safe shutdown;
8) when magneto and induction machine generate electricity by way of merging two or more grid systems simultaneously, and when wind speed is between the grid-connected wind speed V2 of normal mode induction machine and normal mode induction machine off-grid wind speed V1, magneto is pressed Fig. 6 a curve (9) and is run, and induction machine is pressed Fig. 6 a curve (10) and run;
9) when magneto and induction machine generate electricity by way of merging two or more grid systems simultaneously, and wind speed be less than normal mode induction machine off-grid wind speed V1 or reach the common generated output of unit bi-motor and lower in limited time, (11) magneto increases power by such as Fig. 2 power curve, (12) induction machine reduces power by power curve, until induction machine load is reduced as zero, induction machine off-grid; Magneto by current transformer adjustment electromagnetic torque makes wind wheel be operated in rotating speed corresponding to the maximum usage factor of wind energy, magneto electricity generation system variable speed constant frequency work, as the magneto power curve in Fig. 6 a (1).
Fig. 6 b is the power diagram of the present invention first motor rated power pattern, the first motor and the second motor common grid-connected time, control current transformer make the first motor with the work of rated power invariable power, the second motor self adaptation wind speed, until reach the rated power of unit.Aforementioned self adaptation wind speed refers to the change automatically adapting to input power.
Fig. 6 c is the power diagram of ratio power allocation pattern of the present invention, the first motor and the second motor common grid-connected time, control current transformer the ratio of the power of the first motor and the second motor is fixed, until reach the rated power of unit.
Such as: unit total installation of generating capacity is 2MW, magneto installed capacity 1MW, induction machine installed capacity 1MW, so magneto and induction machine are born power respectively and are respectively 1/2,1/2, when input power is 1.6MW, wherein magneto exports 0.8MW active power, and induction machine exports 0.8MW active power.System, by the adjustment of current transformer to magneto electromagnetic torque, realizes magneto active power of output on request, and induction machine realizes active power according to the change of its revolutional slip and exports.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the grid-connected control method of a bi-motor wind turbine generator, it is characterized in that, described wind turbine generator comprises the first motor, the second motor and transfer case, two output shafts of described transfer case connect described first motor and the second motor respectively, described first motor connects current transformer, wherein, described grid-connected control method comprises the following steps:
When first motor is grid-connected, the power of described first motor of described current transformer adjustment;
First motor and the second motor common grid-connected time, the rotating speed of described two output shafts of described current transformer adjustment, to adjust the power division of described first motor and the second motor;
Second motor is cut or when cutting out, the rotating speed of described two output shafts of described current transformer adjustment, makes described second motor meet incision or cut out condition.
2. the grid-connected control method of bi-motor wind turbine generator according to claim 1, is characterized in that, the first motor and the second motor common grid-connected time, comprise the following steps:
Controlling described current transformer makes the first motor to carry out invariable power work lower than rated power, the second motor self adaptation wind speed;
When the second motor reaches rated power, the second motor carries out invariable power work with rated power, and the first motor self adaptation wind speed, until reach the rated power of unit.
3. the grid-connected control method of bi-motor wind turbine generator according to claim 2, is characterized in that, is describedly specially 50% of rated power lower than rated power.
4. the grid-connected control method of bi-motor wind turbine generator according to claim 1, it is characterized in that, first motor and the second motor common grid-connected time, control described current transformer and the ratio of the power of the first motor and the second motor fixed, until reach the rated power of unit.
5. the grid-connected control method of bi-motor wind turbine generator according to claim 1, it is characterized in that, first motor and the second motor common grid-connected time, controlling described current transformer makes the first motor with the work of rated power invariable power, described second motor self adaptation wind speed, until reach the rated power of unit.
6. the grid-connected control method of the bi-motor wind turbine generator according to any one of claim 1-5, is characterized in that, also comprise step: when reaching the rated power of unit, by pitch-controlled system adjustment unit propeller pitch angle.
7. the grid-connected control method of the bi-motor wind turbine generator according to any one of claim 1-5, it is characterized in that, also comprise step: when wind speed reaches unit cut-out wind speed, by pitch-controlled system adjustment unit propeller pitch angle, and first control the second motor to cut out, then control the first motor and cut out.
8. the grid-connected control method of the bi-motor wind-driven generator according to any one of claim 1-5; it is characterized in that, after the first motor and the second motor all cut out, the pitch angle of adjustment pitch-controlled system is 90 degree; yaw system adjustment wind wheel crosswind, unit safety is shut down.
9. the grid-connected control method of the bi-motor wind turbine generator according to any one of claim 1-5, is characterized in that, also comprise the step detecting unit whether fault, if described first motor or current transformer fault, described second motor works alone; If described second electrical fault, described first motor works alone.
10. the grid-connected control method of bi-motor wind turbine generator according to claim 9, is characterized in that, when described second motor works alone, by pitch-controlled system adjustment unit propeller pitch angle, makes described second motor meet incision or cut out condition.
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| CN105932714A (en) * | 2016-06-16 | 2016-09-07 | 三重型能源装备有限公司 | Dual-motor wind power generator grid-connection apparatus, wind power generator and grid-connection control method |
| CN106089579A (en) * | 2016-06-16 | 2016-11-09 | 三重型能源装备有限公司 | The control method of wind power generating set and system |
| CN107727422A (en) * | 2017-09-26 | 2018-02-23 | 中国科学院电工研究所 | A kind of high-power wind mill dynamic simulation experiment system |
| CN114992047A (en) * | 2022-07-13 | 2022-09-02 | 华电电力科学研究院有限公司 | Wind generating set control method and related components |
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| CN105932714A (en) * | 2016-06-16 | 2016-09-07 | 三重型能源装备有限公司 | Dual-motor wind power generator grid-connection apparatus, wind power generator and grid-connection control method |
| CN106089579A (en) * | 2016-06-16 | 2016-11-09 | 三重型能源装备有限公司 | The control method of wind power generating set and system |
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| CN114992047A (en) * | 2022-07-13 | 2022-09-02 | 华电电力科学研究院有限公司 | Wind generating set control method and related components |
| CN114992047B (en) * | 2022-07-13 | 2024-05-28 | 华电电力科学研究院有限公司 | Control method of wind generating set and related components |
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| CN105048496B (en) | 2018-09-07 |
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