CN203942288U - A kind of double-fed wind generator AC and DC grid-connected system - Google Patents
A kind of double-fed wind generator AC and DC grid-connected system Download PDFInfo
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- CN203942288U CN203942288U CN201420301670.2U CN201420301670U CN203942288U CN 203942288 U CN203942288 U CN 203942288U CN 201420301670 U CN201420301670 U CN 201420301670U CN 203942288 U CN203942288 U CN 203942288U
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 230000005540 biological transmission Effects 0.000 claims abstract description 13
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 238000004804 winding Methods 0.000 claims description 16
- 238000010248 power generation Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 description 5
- 230000005284 excitation Effects 0.000 description 5
- 230000009183 running Effects 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000819 phase cycle Methods 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
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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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Abstract
The utility model discloses a kind of double-fed wind generator AC and DC grid-connected system, comprise measurement control module, prime mover and transmission thereof and speedup module, double-fed asynchronous generator, generator side converter, grid side rectifier, energy conversion module, AC network; Because double-fed wind generator is at the active power substantially constant of its stator output of supersynchronous when operation, and then double-fed aerogenerator stator side can be exported substantially invariable active power in the comparatively broad range of speeds.When the utility model can reduce the fluctuation of speed, the impact of double-fed asynchronous generator group power output on electrical network, even can make the normal power of double-fed asynchronous generator group as electrical network, improves the stability of operation of power networks; The power of rotor output is converted into other forms and stores or consume.Native system technological means is simple and easy to do, with low cost, be easy to realize, and has outstanding technique effect, can be widely used in wind-force, waterpower or thermal power generation field etc.
Description
Technical field
The utility model relates to wind-force, waterpower or thermal power generating technology field, relates in particular to a kind of double-fed wind generator AC and DC grid-connected system.
Background technology
Double-fed type asynchronous generator is made up of two parts to the power of electrical network output, the power of directly exporting through frequency converter from power and the rotor of stator output.
The mechanical speed of for example wind energy conversion system allows to change along with wind speed.By making wind energy conversion system operate in optimum tip-speed ratio to the control of generator, thereby make all there is best power coefficient in the scope of whole service speed.When the rotating speed of generator is during lower than the rotating speed of air-gap rotating magnetic field, generator is in the operation of metasynchronism speed, consistent with mains frequency in order to ensure the frequency that generator sends, need frequency converter to provide positive phase sequence excitation to generator amature, give the input of rotor winding an exciting current that its rotating magnetic field direction is identical with rotor mechanical direction, now, the brake torque of rotor is contrary with the mechanical steering of rotor, the electric current of rotor must with the induction back electromotive force of rotor in the other direction, revolutional slip reduces, stator is to electrical network feeding electric power, and frequency converter is to rotor winding input power, when the rotating speed of generator is during higher than the rotating speed of air-gap rotating magnetic field, generator is in supersynchronous speed operation, consistent with mains frequency in order to ensure the frequency that generator sends, need to give the exciting current of its rotating magnetic field direction of rotor winding input and rotor mechanical opposite direction, now frequency converter provides negative-phase sequence excitation to generator amature, to strengthen revolutional slip, frequency converter is from rotor winding absorbed power, in the time that the rotating speed of generator equals the rotating speed of air-gap rotating magnetic field, generator moves in synchronous speed, frequency converter should provide DC excitation to rotor, now, the brake torque of rotor is contrary with the mechanical steering of rotor, equidirectional with the torque that rotor induced current produces, stator and rotor are all to electrical network feeding electric power.The wind of abandoning of wind power generation is because local electrical network is received scarce capacity and the unstable part wind electric field blower time-out that waits own characteristic to cause of wind-powered electricity generation, abandon the wind energy turbine set performance driving economy decline that the wind problem of rationing the power supply causes, abandoning the main cause that wind rations the power supply is a grid-connected difficult problem, wind-powered electricity generation is exerted oneself unstable, need other power supplys to provide free peak regulation service for it, need to build pumped storage, the peak regulations such as fuel gas generation, variable frequency power source, in the time that peak is in short supply, abandon the wind especially severe of rationing the power supply, optimize planning power supply architecture and electrical network layout, expand the wind-powered electricity generation market of dissolving, also need by scientific and technical innovation, promote the coordination of wind-powered electricity generation production and consumption.
Similar to wind power generation, the hydraulic turbine in hydroelectric power generation also can be realized variable-speed operation to improve the operational efficiency of the hydraulic turbine by double-fed asynchronous generator according to the parameter such as working head, flow under the operating mode of place, improves operation conditions.
Summary of the invention
When the purpose of this utility model is to reduce fluctuations in wind speed or hydraulic turbine operating head and changes in flow rate, the impact of double-fed asynchronous generator group power output on electrical network, provides a kind of double-fed wind generator AC and DC grid-connected system; The more stable power of stator winding output is directly incorporated into AC network, can makes the normal power of double-fed asynchronous generator group as electrical network, improve the stability of operation of power networks; The power of rotor output is converted into other forms of energy storage or consumes.
The utility model is achieved through the following technical solutions:
A kind of double-fed wind generator AC and DC grid-connected system, comprises measurement control module, prime mover and transmission thereof and speedup module, double-fed asynchronous generator, generator side converter, DC bus, energy conversion module, grid side rectifier, ac bus, step-up transformer, AC network;
Described measurement control module connects prime mover and transmission thereof and speedup module, double-fed asynchronous generator, ac bus, step-up transformer, AC network successively;
Described generator side converter connects DC bus, grid side rectifier successively;
Described energy conversion module is also connected with DC bus;
Described generator side converter is also connected with double-fed asynchronous generator, and described grid side rectifier is also connected with ac bus.
Generator side converter connects the rotor field coil of double-fed asynchronous generator; Described ac bus connects the stator winding of double-fed asynchronous generator.
Described prime mover comprises wind-driven generator, hydroelectric generator or thermoelectric generator.
The operation method of above-mentioned double-fed wind generator AC and DC grid-connected system is as follows,
One: measure control module, measure the rotating speed of double-fed asynchronous generator, and according to the rotating speed of double-fed asynchronous generator, determine the running status of double-fed asynchronous generator;
Two: measure control module for controlling frequency, amplitude and the phase parameter of generator side converter, realize meritorious, the idle decoupling zero control of double-fed asynchronous generator;
Three: prime mover and transmission thereof and speedup module are mechanical energy by kinetic energy, potential energy converting and energy, and improve the rotating speed of double-fed asynchronous generator by transmission and speedup module, or directly drive double-fed asynchronous generator without speedup;
Four: mechanical energy is converted to electric energy by double-fed asynchronous generator, the AC energy of the stator coil output of double-fed asynchronous generator, directly delivers to AC network;
Five: in the time that double-fed asynchronous generator runs on supersynchronous state, be that direct current outputs to DC bus by the alternating current of the rotor winding output of double-fed asynchronous generator through the rectification of generator side converter, supply with energy conversion module, convert electrical energy into heat energy or hydrogen energy;
Six: in the time that double-fed asynchronous generator runs on synchronous regime, grid side rectifier is that direct current outputs to DC bus by grid alternating current rectification, and generator side converter is the rotor field coil to double-fed asynchronous generator by the direct voltage output of DC bus;
Seven: in the time that double-fed asynchronous generator runs on metasynchronism state, grid side rectifier is that direct current outputs to DC bus by grid alternating current rectification, and generator side converter is converted to the direct voltage of DC bus low-frequency ac and outputs to the rotor field coil of double-fed asynchronous generator;
Eight: the alternating current of AC network input is converted to direct current output DC bus by grid side rectifier, for double-fed asynchronous generator synchronous and metasynchronism state provides excitation, and stable DC busbar voltage;
Nine: DC bus provides energy flow passage for generator side converter, grid side rectifier and energy conversion module;
Ten: energy conversion module is that heat energy, hydrogen can store or consume by the electric energy conversion of generator side converter and the output of grid side rectifier.
The application of double-fed wind generator AC and DC grid-connected system:
In the time being applied to brushless double feed generator, the stator coil of double-fed asynchronous generator is corresponding to the power winding of brushless double feed generator, and the rotor coil of double-fed asynchronous generator is corresponding to the control winding of brushless double feed generator; Or,
When be applied in wind-force, waterpower or thermal power generation field many double-fed asynchronous generator parallel runnings time, every double-fed asynchronous generator joined a generator side converter, measured control module, prime mover and transmission and speedup module, double-fed generator stator winding connects public ac bus, generator side converter connects public DC bus, and grid side rectifier, energy conversion module and step-up transformer can share.
The utility model, with respect to prior art, has following advantage and effect:
The utility model is according to the running status of double-fed asynchronous generator, the more stable active power of motor stator coil output is incorporated to AC network, and the larger rotor coil power output of generator power fluctuation is delivered to water electrolyser or heat supply equal energy source modular converter, be translated into other forms of energy storage or consume, when for wind power plant, the impact of wind generator set stator power output on electrical network can reduce fluctuations in wind speed time, even can make the normal power of double-fed wind power generator group as electrical network, improve the stability of operation of power networks; And can improve the energy conversion efficiency of the hydraulic turbine while being applied to hydroelectric power generation, improve the operating condition of the hydraulic turbine
The utility model technological means is simple and easy to do, with low cost, be easy to realize, and has outstanding technique effect.
The utility model can be widely used in wind-force, waterpower or thermal power generation field.
Brief description of the drawings
Fig. 1 is the utility model structural representation.
Embodiment
Below in conjunction with specific embodiment, the utility model is more specifically described in detail.
Embodiment
As shown in Figure 1.The utility model double-fed wind generator AC and DC grid-connected system, comprises measurement control module, prime mover and transmission thereof and speedup module, double-fed asynchronous generator, generator side converter, DC bus, energy conversion module, grid side rectifier, ac bus, step-up transformer, AC network;
Described measurement control module connects prime mover and transmission thereof and speedup module, double-fed asynchronous generator, ac bus successively;
Described generator side converter connects DC bus, grid side rectifier successively;
Described energy conversion module is also connected with DC bus;
Described generator side converter is also connected with double-fed asynchronous generator, and described grid side rectifier is also connected with ac bus, DC bus.
Generator side converter connects the rotor field coil of double-fed asynchronous generator; Described ac bus connects the stator winding of double-fed asynchronous generator.
Described prime mover comprises wind-driven generator, hydroelectric generator or thermoelectric generator.
The operation method of above-mentioned double-fed wind generator AC and DC grid-connected system is as follows,
One: measure control module, measure the rotating speed of double-fed asynchronous generator, and according to the rotating speed of double-fed asynchronous generator, determine the running status of double-fed asynchronous generator; When adopting when wind-driven generator, when double-fed asynchronous generator moves below rated speed, make the wind wheel of wind-driven generator be operated in maximal wind-energy and follow the trail of state, when double-fed asynchronous generator runs on rated speed when above, Maximum Power Output;
Two: measure control module for controlling the parameter such as frequency, amplitude and phase place of generator side converter, realize the gaining merit of double-fed asynchronous generator, idle decoupling zero control;
Three: prime mover and transmission thereof and speedup module are mechanical energy by kinetic energy, potential energy converting and energy, and improve the rotating speed of double-fed asynchronous generator by transmission and speedup module, or directly drive double-fed asynchronous generator without speedup;
Four: mechanical energy is converted to electric energy by double-fed asynchronous generator, the AC energy of the stator coil output of double-fed asynchronous generator, directly delivers to AC network;
Five: in the time that double-fed asynchronous generator runs on supersynchronous state, be that direct current outputs to DC bus by the alternating current of the rotor winding output of double-fed asynchronous generator through the rectification of generator side converter, supply with energy conversion module, convert electrical energy into the other forms of energy such as heat energy or hydrogen energy;
Six: in the time that double-fed asynchronous generator runs on synchronous regime, grid side rectifier is that direct current outputs to DC bus by grid alternating current rectification, and generator side converter outputs to the direct current of DC bus the rotor field coil of double-fed asynchronous generator;
Seven: in the time that double-fed asynchronous generator runs on metasynchronism state, grid side rectifier is that direct current outputs to DC bus by grid alternating current rectification, and generator side converter is converted to the direct current of DC bus low frequency ac and outputs to the rotor field coil of double-fed asynchronous generator;
Eight: grid side rectifier is converted to direct current by the alternating current of AC network input and outputs to DC bus, for the double-fed asynchronous generator rotor coil of synchronous and metasynchronism state provides excitation, and stable DC busbar voltage, also can in the time that network load is lower, output to energy conversion module from electrical network absorbed power, fill electrical network electricity paddy load;
Nine: DC bus provides energy flow passage for generator side converter, grid side rectifier and energy conversion module;
Ten: energy conversion module is converted into other forms of energy storage or the consumption such as heat energy, hydrogen energy by the electric energy of generator side converter and the output of grid side rectifier by resistance, water electrolyser etc.
The application of double-fed wind generator AC and DC grid-connected system is as follows:
In the time being applied to brushless double feed generator, the stator coil of double-fed asynchronous generator is corresponding to the power winding of brushless double feed generator, and the rotor coil of double-fed asynchronous generator is corresponding to the control winding of brushless double feed generator; Or,
When be applied in wind-force, waterpower or thermal power generation field many double-fed asynchronous generator parallel runnings time, every double-fed asynchronous generator joined a generator side converter, measured control module, prime mover and transmission and speedup module, double-fed generator stator winding connects public ac bus, generator side converter connects public DC bus, and grid side rectifier, energy conversion module and step-up transformer can share.
As mentioned above, just can realize preferably the utility model.
Execution mode of the present utility model is not restricted to the described embodiments; other are any does not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitute, combination, simplify; all should be equivalent substitute mode, within being included in protection range of the present utility model.
Claims (3)
1. a double-fed wind generator AC and DC grid-connected system, is characterized in that:
Comprise measurement control module, prime mover and transmission thereof and speedup module, double-fed asynchronous generator, generator side converter, DC bus, energy conversion module, grid side rectifier, ac bus, step-up transformer, AC network;
Described measurement control module connects prime mover and transmission thereof and speedup module, double-fed asynchronous generator, ac bus successively;
Described generator side converter connects DC bus, grid side rectifier successively;
Described energy conversion module is also connected with DC bus;
Described generator side converter is also connected with double-fed asynchronous generator, and described grid side rectifier is also connected with ac bus, DC bus.
2. double-fed wind generator AC and DC grid-connected system according to claim 1, is characterized in that: generator side converter connects the rotor field coil of double-fed asynchronous generator; Described ac bus connects the stator winding of double-fed asynchronous generator.
3. double-fed wind generator AC and DC grid-connected system according to claim 1, is characterized in that: described prime mover comprises wind-driven generator, hydroelectric generator or thermoelectric generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420301670.2U CN203942288U (en) | 2014-06-06 | 2014-06-06 | A kind of double-fed wind generator AC and DC grid-connected system |
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| CN201420301670.2U CN203942288U (en) | 2014-06-06 | 2014-06-06 | A kind of double-fed wind generator AC and DC grid-connected system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092235A (en) * | 2014-06-06 | 2014-10-08 | 华南理工大学 | Doubly-fed generator set AC/DC grid-connected system, and method and application |
| CN106936282A (en) * | 2015-12-30 | 2017-07-07 | 华南理工大学 | A kind of synchronous generator asynchronization capacity-increasing transformation system based on rotary transformer |
| CN110621872A (en) * | 2017-04-13 | 2019-12-27 | 福伊特专利有限公司 | Hydroelectric power plant for regulating the frequency of an electrical network and method for operating same |
-
2014
- 2014-06-06 CN CN201420301670.2U patent/CN203942288U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092235A (en) * | 2014-06-06 | 2014-10-08 | 华南理工大学 | Doubly-fed generator set AC/DC grid-connected system, and method and application |
| CN104092235B (en) * | 2014-06-06 | 2017-01-11 | 华南理工大学 | Doubly-fed generator set AC/DC grid-connected system, and method and application |
| CN106936282A (en) * | 2015-12-30 | 2017-07-07 | 华南理工大学 | A kind of synchronous generator asynchronization capacity-increasing transformation system based on rotary transformer |
| CN110621872A (en) * | 2017-04-13 | 2019-12-27 | 福伊特专利有限公司 | Hydroelectric power plant for regulating the frequency of an electrical network and method for operating same |
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Granted publication date: 20141112 |