CN102510082B - Power-grid-friendly-type wind power generating set and control method thereof - Google Patents
Power-grid-friendly-type wind power generating set and control method thereof Download PDFInfo
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- CN102510082B CN102510082B CN201110330815.2A CN201110330815A CN102510082B CN 102510082 B CN102510082 B CN 102510082B CN 201110330815 A CN201110330815 A CN 201110330815A CN 102510082 B CN102510082 B CN 102510082B
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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
- Y02E10/76—Power conversion electric or electronic aspects
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention relates to a control method of a power-grid-friendly-type wind power generating set comprising a wind wheel, a driving device, a permanent magnet synchronous motor and an electrically excited synchronous power generator, wherein the driving device is connected with the wind wheel; the permanent magnet synchronous motor and the electrically excited synchronous power generator are driven by the driving device; the total rated power of the permanent magnet synchronous motor is one third of the rated power of the wind power generating set; the rated power of the electrically excited synchronous power generator is two thirds of the rated power of the wind power generating set; the permanent magnet synchronous motor is electrically connected with a convertor which controls the operation state of the permanent magnet synchronous motor; according to the wind speed and the rotation speed of the permanent magnet synchronous motor, a control system of the convertor controls the permanent magnet synchronous motor to be used as an electric power generator or an electromotor respectively; and the electrically excited synchronous power generator is connected with an excitation control device which regulates the active power component or reactive power component that are output by the synchronous power generator. According to the invention, the stable junction of the wind power generator set and the power grid can be realized only through utilizing the convertor the power of which is equivalent to one third of that of the wind power generating set, and the cost is lower.
Description
Technical field
The present invention relates to grid type wind-driven generator technical group field, the friendly type wind turbine generator of especially a kind of electrical network and control method thereof.
Background technology
The problem of wind power generation maximum is exactly unstable with being connected of electrical network, electrical network is very restricted its receiving ability, and emphasis shows 5 aspects of remote adjustment of reliability, wind power prediction and meritorious and the reactive power of low voltage crossing, the quality of power supply, wind power generation.For this situation of low voltage crossing, more effective technical measures mainly contain following two kinds at present:
One is that to adopt synchronous generator or asynchronous generator to add total power unsteady flow grid-connected, another kind of mode is before synchronous generator, to add a stepless speed-regulating device, make the rotating speed of synchronous generator keep constant, make synchronous generator function direct grid-connected generating as hydraulic generator of wind-driven generator.
In technique scheme, adopt the grid-connected meeting of total power unsteady flow greatly to increase the manufacturing cost of wind turbine generator, its reliability is also affected and the voltage that only can tackle in the short time falls simultaneously.And the method that increases stepless speed-regulating device can make the structure of driving chain of wind generating set more complicated, and reduce efficiency and the reliability of unit.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, the friendly type wind turbine generator of a kind of electrical network and control method thereof are provided, use lower cost to improve the stability that wind turbine generator is connected with electrical network.
The technical solution adopted for the present invention to solve the technical problems is: the friendly type wind turbine generator of a kind of electrical network, the transmission device that comprises wind wheel, be connected with wind wheel, the permagnetic synchronous motor by actuator drives, electric excitation synchronous generator, the total rated power of described permagnetic synchronous motor accounts for 1/3 of wind turbine generator rated power, the rated power of described electric excitation synchronous generator accounts for 2/3 of wind turbine generator rated power, and described permagnetic synchronous motor is electrically connected with the current transformer of controlling permagnetic synchronous motor operating state.
The control system of described current transformer is used as generator or motor respectively according to the rotating speed control permagnetic synchronous motor of wind speed and permagnetic synchronous motor, the power factor of the current transformer adjustable permagnetic synchronous motor of described permagnetic synchronous motor described in during as generator.
The structure of described transmission device is: described transmission device comprises power transmission shaft, gearbox, power transmission shaft two ends connect respectively wind wheel and gearbox, the rear end of described gearbox is provided with rear power output shaft, the rear power output shaft of described gearbox is connected with electric excitation synchronous generator, and described permagnetic synchronous motor is coaxially connected with electric excitation synchronous generator.
The structure of described transmission device is: described transmission device comprises power transmission shaft, gearbox, power transmission shaft two ends connect respectively wind wheel and gearbox, the front end of described gearbox is provided with more than one front power output shaft, the rear end of described gearbox is provided with rear power output shaft, more than one front power output shaft is connected with more than one permagnetic synchronous motor respectively, and described rear power output shaft is connected with electric excitation synchronous generator.
The quantity of described permagnetic synchronous motor is 3-4 platform, and the quantity of described front power output shaft is identical with the quantity of permagnetic synchronous motor.
Described electric excitation synchronous generator is connected with the excitation controlling device of adjusting electric excitation synchronous generator active power of output component or reactive power component.
A control method of controlling the friendly type wind turbine generator of described electrical network, is specially:
(1) when wind speed is greater than after the incision wind speed of wind turbine generator, the control system control permagnetic synchronous motor of current transformer uses as generator, permagnetic synchronous motor enters generating state, permagnetic synchronous motor by current transformer to extraneous electrical network transmission of electric energy, the active power output component of the control system control permagnetic synchronous motor of current transformer also progressively increases the active power output component of permagnetic synchronous motor, and electric excitation synchronous generator is in no-load running state.
(2) permagnetic synchronous motor reaches after rated power generating, now, the rotating speed of permagnetic synchronous motor also reaches rated speed, electricity excitation synchronous generator and electrical network are connected, electricity excitation synchronous generator enters generating state, when the generated output of electricity excitation synchronous generator progressively increases, the active power output of permagnetic synchronous motor reduces gradually until stop completely, when the active power output of permagnetic synchronous motor stops, the control system control permagnetic synchronous motor of current transformer uses as motor, the control system control permagnetic synchronous motor output reactive power of current transformer, permagnetic synchronous motor is by rated speed operation.
(3) when electric excitation synchronous generator reaches after rated power generating, the control system control permagnetic synchronous motor of current transformer uses as generator again, permagnetic synchronous motor enters generating state, permagnetic synchronous motor by current transformer to extraneous electrical network transmission of electric energy, electricity excitation synchronous generator and permagnetic synchronous motor are connected with excitation controlling device to the electric excitation synchronous generator described in extraneous grid generation simultaneously, described excitation controlling device is overexcitation or normal excitation or underexcitation to the excitation mode of electric excitation synchronous generator, in the time that extraneous line voltage falls, excitation controlling device selects different excitation modes to adjust electric excitation synchronous generator active power of output component or reactive power component according to the requirement of external power scheduling.
When wind speed is greater than after the cut-out wind speed of wind turbine generator, permagnetic synchronous motor and electric excitation synchronous generator are all out of service.
Described electric excitation synchronous generator is connected with excitation controlling device, described excitation controlling device is overexcitation or normal excitation or underexcitation to the excitation mode of electric excitation synchronous generator, in the time that extraneous line voltage falls, excitation controlling device selects different excitation modes to adjust electric excitation synchronous generator active power of output component or reactive power component according to the requirement of external power scheduling.
In step (2), the control system control permagnetic synchronous motor output reactive power of current transformer, permagnetic synchronous motor is by after rated speed operation, if the rotating speed of permagnetic synchronous motor is greater than the rated speed of permagnetic synchronous motor, the control system control permagnetic synchronous motor of current transformer sends corresponding active power makes the rotating speed of permagnetic synchronous motor return rated speed; If the rotating speed of permagnetic synchronous motor is less than the rated speed of permagnetic synchronous motor, the control system control permagnetic synchronous motor of current transformer sends corresponding reactive power makes the rotating speed of permagnetic synchronous motor return rated speed, thereby ensures the stabilization of speed of permagnetic synchronous motor and electric excitation synchronous generator.
When wind speed is greater than after the cut-out wind speed of wind turbine generator, permagnetic synchronous motor and electric excitation synchronous generator are all out of service.
The invention has the beneficial effects as follows: the current transformer that the present invention only needs use to be equivalent to wind turbine generator 1/3 power can be realized with the stable of electrical network and being connected, and cost is lower.The control system of current transformer is controlled permagnetic synchronous motor and is used as generator and motor respectively in different rotating speeds according to the variation of wind speed.The invention enables wind turbine generator that the friendly of electrical network has been had further and improved, excitation controlling device selects different excitation modes to adjust electric excitation synchronous generator active power of output component or reactive power component according to the requirement of external power scheduling, simultaneously, current transformer control permagnetic synchronous motor is exported corresponding active power or reactive power component, thereby electrical network is provided support, and the support of this form is better than direct-driving type wind power generation unit of the prior art or double feed wind power generator group.
Brief description of the drawings
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1 is the structural representation of the embodiment mono-of transmission device in the present invention;
Fig. 2 is the structural representation of the embodiment bis-of transmission device in the present invention;
Wherein: 1. power transmission shaft, 2. gearbox, 3. permagnetic synchronous motor, 4. electric excitation synchronous generator.
Embodiment
The present invention is further illustrated by reference to the accompanying drawings now.The schematic diagram that these accompanying drawings are simplification only illustrates basic structure of the present invention in a schematic way, and therefore it only shows the formation relevant with the present invention.
The friendly type wind turbine generator of a kind of electrical network, the transmission device, the permagnetic synchronous motor 3 by actuator drives, the electric excitation synchronous generator 4 that comprise wind wheel, be connected with wind wheel, as shown in Figure 1, the embodiment mono-of transmission device: transmission device comprises power transmission shaft 1, gearbox 2, power transmission shaft 1 two ends connect respectively wind wheel and gearbox 2, the rear end of gearbox 2 is provided with rear power output shaft, the rear power output shaft of gearbox 2 is connected with electric excitation synchronous generator 4, and permagnetic synchronous motor 3 is coaxially connected with electric excitation synchronous generator 4.
As shown in Figure 2, the embodiment bis-of transmission device: transmission device comprises power transmission shaft 1, gearbox 2, power transmission shaft 1 two ends connect respectively wind wheel and gearbox 2, be with the difference of embodiment mono-: the front end of gearbox 2 is provided with the front power output shaft of 3, the rear end of gearbox 2 is provided with rear power output shaft, 3 front power output shafts are connected with 3 permagnetic synchronous motors 3 respectively, and rear power output shaft is connected with electric excitation synchronous generator 4.
No matter transmission device adopts the structure of embodiment mono-or the structure of embodiment bis-, and the wind wheel in wind turbine generator of the present invention is provided with velocity measurement mechanisms, and permagnetic synchronous motor 3 is electrically connected with current transformer, and power transmission shaft 1 afterbody is provided with tachometer disc and becomes sizing device.The total rated power of permagnetic synchronous motor 3 accounts for 1/3 of wind turbine generator rated power, rated power by the electric excitation synchronous generator 4 of direct current excitation accounts for 2/3 of wind turbine generator rated power, and permagnetic synchronous motor 3 is electrically connected with the current transformer of controlling permagnetic synchronous motor operating state.The control system of current transformer is used as generator or motor respectively according to the rotating speed control permagnetic synchronous motor of wind speed and permagnetic synchronous motor, the power factor of the current transformer adjustable permagnetic synchronous motor of permagnetic synchronous motor described in during as generator.
The component of control system control permagnetic synchronous motor 3 active power of output of current transformer or the component of output reactive power.Electricity excitation synchronous generator 4 is connected with the excitation controlling device of adjusting electric excitation synchronous generator 4 active power of output components or reactive power component.
A kind of control method of controlling the friendly type wind turbine generator of electrical network, be specially: (1) is greater than after the incision wind speed of wind turbine generator when wind speed, the control system control permagnetic synchronous motor 3 of current transformer uses as generator, permagnetic synchronous motor 3 enters generating state, permagnetic synchronous motor 3 by current transformer to extraneous electrical network transmission of electric energy, the active power output component of the control system control permagnetic synchronous motor 3 of current transformer also progressively increases the active power output component of permagnetic synchronous motor 3, and electric excitation synchronous generator 4 is in no-load running state;
(2) permagnetic synchronous motor 3 reaches after rated power generating, now, the rotating speed of permagnetic synchronous motor 3 also reaches rated speed, electricity excitation synchronous generator 4 is connected with electrical network, electricity excitation synchronous generator 4 enters generating state, when the generated output of electricity excitation synchronous generator 4 progressively increases, the active power output of permagnetic synchronous motor 3 reduces gradually until stop completely, when the active power output of permagnetic synchronous motor 3 stops, the control system control permagnetic synchronous motor 3 of current transformer uses as motor, control system control permagnetic synchronous motor 3 output reactive powers of current transformer, permagnetic synchronous motor 3 is by rated speed operation,
If the rotating speed of permagnetic synchronous motor 3 is greater than the rated speed of permagnetic synchronous motor 3, the control system control permagnetic synchronous motor 3 of current transformer sends corresponding active power makes the rotating speed of permagnetic synchronous motor 3 return rated speed;
If the rotating speed of permagnetic synchronous motor 3 is less than the rated speed of permagnetic synchronous motor 3, the control system control permagnetic synchronous motor 3 of current transformer sends corresponding reactive power makes the rotating speed of permagnetic synchronous motor 3 return rated speed, thereby ensures the stabilization of speed of permagnetic synchronous motor 3 and electric excitation synchronous generator 4.
(3) when electric excitation synchronous generator 4 reaches after rated power generating, the control system control permagnetic synchronous motor 3 of current transformer uses as generator again, permagnetic synchronous motor 3 enters generating state, permagnetic synchronous motor 3 by current transformer to extraneous electrical network transmission of electric energy, electricity excitation synchronous generator 4 simultaneously to extraneous grid generation, is realized the support to electrical network with permagnetic synchronous motor 3.
If permagnetic synchronous motor 3 still can not maintain rated speed operation as electrical motors after maximum power, electric excitation synchronous generator 4 exits generating state, and the control system control permagnetic synchronous motor 3 of current transformer uses as generator.When wind speed is greater than after the cut-out wind speed of wind turbine generator, permagnetic synchronous motor 3 and electric excitation synchronous generator 4 are all out of service.
Excitation controlling device is overexcitation or normal excitation or underexcitation to the excitation mode of electric excitation synchronous generator 4, in the time that extraneous line voltage falls, excitation controlling device selects different excitation modes to adjust electric excitation synchronous generator 4 active power of output components or reactive power component according to the requirement of external power scheduling.Meanwhile, the control system of current transformer also can be controlled permagnetic synchronous motor 3 and export corresponding reactive power component, and electrical network provides effective support to external world.
The present invention only needs to use the current transformer that is equivalent to wind turbine generator 1/3 power, realize the output of active power and the reactive power of permagnetic synchronous motor 3, and electrical network provides effective support to external world, realizes low voltage ride-through function, and cost is lower.Permagnetic synchronous motor 3 all can keep stable with the rotating speed of electric excitation synchronous generator 4, without through powerful current transformer, has improved the quality of power supply of extraneous electrical network.
Taking above-mentioned foundation desirable embodiment of the present invention as enlightenment, by above-mentioned description, relevant staff can, not departing from the scope of this invention technological thought, carry out various change and amendment completely.The technical scope of this invention is not limited to the content on specification, must determine its technical scope according to claim scope.
Claims (8)
1. the control method of the friendly type wind turbine generator of electrical network, described wind turbine generator comprises wind wheel, the transmission device being connected with wind wheel, by the permagnetic synchronous motor of actuator drives, electricity excitation synchronous generator, the total rated power of described permagnetic synchronous motor accounts for 1/3 of wind turbine generator rated power, the rated power of described electric excitation synchronous generator accounts for 2/3 of wind turbine generator rated power, described permagnetic synchronous motor is electrically connected with the current transformer of controlling permagnetic synchronous motor operating state, the control system of described current transformer is used as generator or motor respectively according to the rotating speed control permagnetic synchronous motor of wind speed and permagnetic synchronous motor, when permagnetic synchronous motor enters generating state permagnetic synchronous motor by current transformer to extraneous electrical network transmission of electric energy,
It is characterized in that: described control method is:
(1) when wind speed is greater than after the incision wind speed of wind turbine generator, the control system control permagnetic synchronous motor of current transformer uses as generator, permagnetic synchronous motor enters generating state, permagnetic synchronous motor by current transformer to extraneous electrical network transmission of electric energy, the active power output component of the control system control permagnetic synchronous motor of current transformer also progressively increases the active power output component of permagnetic synchronous motor, and electric excitation synchronous generator is in no-load running state;
(2) permagnetic synchronous motor reaches after rated power generating, now, the rotating speed of permagnetic synchronous motor also reaches rated speed, electricity excitation synchronous generator and electrical network are connected, electricity excitation synchronous generator enters generating state, when the generated output of electricity excitation synchronous generator progressively increases, the active power output of permagnetic synchronous motor reduces gradually until stop completely, when the active power output of permagnetic synchronous motor stops, the control system control permagnetic synchronous motor of current transformer uses as motor, the control system control permagnetic synchronous motor output reactive power of current transformer, permagnetic synchronous motor is by rated speed operation,
(3) when electric excitation synchronous generator reaches after rated power generating, the control system control permagnetic synchronous motor of current transformer uses as generator again, permagnetic synchronous motor enters generating state, permagnetic synchronous motor is by current transformer to extraneous electrical network transmission of electric energy, and electric excitation synchronous generator and permagnetic synchronous motor are simultaneously to extraneous grid generation.
2. the control method of the friendly type wind turbine generator of a kind of electrical network according to claim 1, is characterized in that: the power factor of the current transformer adjustable permagnetic synchronous motor of described permagnetic synchronous motor described in during as generator.
3. the control method of the friendly type wind turbine generator of a kind of electrical network according to claim 1, it is characterized in that: the structure of described transmission device is: described transmission device comprises power transmission shaft, gearbox, power transmission shaft two ends connect respectively wind wheel and gearbox, the rear end of described gearbox is provided with rear power output shaft, the rear power output shaft of described gearbox is connected with electric excitation synchronous generator, and described permagnetic synchronous motor is coaxially connected with electric excitation synchronous generator.
4. the control method of the friendly type wind turbine generator of a kind of electrical network according to claim 1, it is characterized in that: the structure of described transmission device is: described transmission device comprises power transmission shaft, gearbox, power transmission shaft two ends connect respectively wind wheel and gearbox, the front end of described gearbox is provided with more than one front power output shaft, the rear end of described gearbox is provided with rear power output shaft, more than one front power output shaft is connected with more than one permagnetic synchronous motor respectively, and described rear power output shaft is connected with electric excitation synchronous generator.
5. the control method of the friendly type wind turbine generator of a kind of electrical network according to claim 4, is characterized in that: the quantity of described permagnetic synchronous motor is 3～4, and the quantity of described front power output shaft is identical with the quantity of permagnetic synchronous motor.
6. the control method of the friendly type wind turbine generator of a kind of electrical network according to claim 1, it is characterized in that: described electric excitation synchronous generator is connected with the excitation controlling device of adjusting electric excitation synchronous generator active power of output component or reactive power component, described excitation controlling device is overexcitation or normal excitation or underexcitation to the excitation mode of electric excitation synchronous generator, in the time that extraneous line voltage falls, excitation controlling device selects different excitation modes to adjust electric excitation synchronous generator active power of output component or reactive power component according to the requirement of external power scheduling.
7. the control method of the friendly type wind turbine generator of a kind of electrical network according to claim 1, it is characterized in that: in step (2), the control system control permagnetic synchronous motor output reactive power of current transformer, permagnetic synchronous motor is by after rated speed operation, if the rotating speed of permagnetic synchronous motor is greater than the rated speed of permagnetic synchronous motor, the control system control permagnetic synchronous motor of current transformer sends corresponding active power makes the rotating speed of permagnetic synchronous motor return rated speed; If the rotating speed of permagnetic synchronous motor is less than the rated speed of permagnetic synchronous motor, the control system control permagnetic synchronous motor of current transformer sends corresponding reactive power makes the rotating speed of permagnetic synchronous motor return rated speed, thereby ensures the stabilization of speed of permagnetic synchronous motor and electric excitation synchronous generator.
8. the control method of the friendly type wind turbine generator of a kind of electrical network according to claim 1, is characterized in that: when wind speed is greater than after the cut-out wind speed of wind turbine generator, permagnetic synchronous motor and electric excitation synchronous generator are all out of service.
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| CN201110330815.2A CN102510082B (en) | 2011-10-27 | 2011-10-27 | Power-grid-friendly-type wind power generating set and control method thereof |
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| CN102510082B true CN102510082B (en) | 2014-07-09 |
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| CN101272084A (en) * | 2008-05-16 | 2008-09-24 | 东南大学 | Electro-mechanical mixed stepless speed-changing wind power generation plant |
| CN101345453A (en) * | 2008-05-06 | 2009-01-14 | 南京航空航天大学 | Mixed field excitation brushless synchronous motor with coordination structure |
| CN201374630Y (en) * | 2009-03-12 | 2009-12-30 | 中国电子科技集团公司第二十一研究所 | Speed-change constant-frequency double-feedback permanent-magnetic wind-driven generator system |
| CN102005875A (en) * | 2010-11-08 | 2011-04-06 | 华北电力大学 | Brushless parallel-structure hybrid excitation synchronous generator without additional air gap |
| CN202284522U (en) * | 2011-10-27 | 2012-06-27 | 江苏新誉重工科技有限公司 | Power grid friendly type wind power generator set |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| AT507392A3 (en) * | 2008-10-09 | 2011-11-15 | Gerald Dipl Ing Hehenberger | METHOD FOR OPERATING A DIFFERENTIAL GEARBOX FOR AN ENERGY-GENERATING PLANT |
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- 2011-10-27 CN CN201110330815.2A patent/CN102510082B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101345453A (en) * | 2008-05-06 | 2009-01-14 | 南京航空航天大学 | Mixed field excitation brushless synchronous motor with coordination structure |
| CN101272084A (en) * | 2008-05-16 | 2008-09-24 | 东南大学 | Electro-mechanical mixed stepless speed-changing wind power generation plant |
| CN201374630Y (en) * | 2009-03-12 | 2009-12-30 | 中国电子科技集团公司第二十一研究所 | Speed-change constant-frequency double-feedback permanent-magnetic wind-driven generator system |
| CN102005875A (en) * | 2010-11-08 | 2011-04-06 | 华北电力大学 | Brushless parallel-structure hybrid excitation synchronous generator without additional air gap |
| CN202284522U (en) * | 2011-10-27 | 2012-06-27 | 江苏新誉重工科技有限公司 | Power grid friendly type wind power generator set |
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