CN202117834U - Double-fed asynchronous generator variable-speed constant-frequency type ocean current power-generating system - Google Patents
Double-fed asynchronous generator variable-speed constant-frequency type ocean current power-generating system Download PDFInfo
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- CN202117834U CN202117834U CN2011202104929U CN201120210492U CN202117834U CN 202117834 U CN202117834 U CN 202117834U CN 2011202104929 U CN2011202104929 U CN 2011202104929U CN 201120210492 U CN201120210492 U CN 201120210492U CN 202117834 U CN202117834 U CN 202117834U
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- generator
- double
- side converter
- fed asynchronous
- asynchronous generator
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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
- Y02E10/20—Hydro energy
Abstract
The utility model discloses a double-fed asynchronous generator variable-speed constant-frequency type ocean current power-generating system which is in grid connection with a three-phase network. The power-generating system comprises a hydroturbine, a bed frame, a main shaft, a step-up gearbox, a double-fed asynchronous generator, an excitation current transformer and an airtight cabin, wherein the hydroturbine is mounted on the bed frame; the main shaft is connected among the hydroturbine, the step-up gearbox and the double-fed asynchronous generator; the excitation current transformer comprises a generator-side current transformer unit and a network-side current transformer unit; a direct current capacitor is further in parallel connection between the generator-side current transformer unit and the network-side current transformer unit; both the stator and the rotor of the double-fed asynchronous generator are in winding type structures, wherein the stator is directly connected with the three-phase network, the rotor is connected with the generator-side current transformer unit, and the network-side current transformer unit is connected with the three-phase network; and except for the hydroturbine and the bed frame, all of the other equipment are arranged in the airtight cabin. The power-generating system can be used for generating electrical energy in a range with wide seawater flow rates and realizing grid connection, thus the double-fed asynchronous generator variable-speed constant-frequency type ocean current power-generating system disclosed by the utility model is suitable for application on a large scale in projects.
Description
Technical field
The utility model relates to the current power generation technical field, particularly, relates to a kind of variable speed constant frequency type current power generation system based on double-fed asynchronous generator.
Background technique
In recent years, along with the fast development of Chinese national economy, the power shortage problem is serious day by day.Particularly the coastal region in east China is the power load center place of China, and annual electricity consumption accounts for 40% of the whole nation.And conventional energy resources such as these regional coals, oil are relatively deficienter, but coastal region in east China marine resources are abundant, containing huge energy by ocean current, if can convert energy by ocean current into electric energy through electricity generating device, with the shortage of electric power situation of alleviating the coastal region in east China effectively.Liaoning of China, Shandong, Zhejiang, Fujian and Taiwan etc. all have fabulous energy development conditions and environment, and the Economy of potentiality to be exploited and commercialization large-scale development is huge.
Convert energy by ocean current into electric energy, need suitable current power generation system.The current power generation system of through engineering approaches must produce electric energy in the scope of seawater velocity broad, and can realize being incorporated into the power networks.But China also is in the starting stage aspect the current power generation technical research at present, and existing small-power experimental prototype all is from the net type, is difficult on engineering, obtain large-scale application.
The model utility content
The purpose of the utility model is to overcome the above-mentioned defective of existing technology; Provide a kind of and can in the scope of seawater velocity broad, produce electric energy, improve generating efficiency, and can be on engineering the grid type double-feedback induction generator variable speed constant frequency type current power generation system of large-scale application.
The technological scheme that realizes above-mentioned purpose is following:
A kind of double-fed asynchronous generator variable speed constant frequency type current power generation system, being incorporated into the power networks with three phase network is connected, and comprises water turbine, pedestal, main shaft, step-up gear, double-fed asynchronous generator, exciter converter and sealed compartment; Said water turbine is installed on the pedestal, and main shaft is connected between water turbine, step-up gear and the double-fed asynchronous generator; Said exciter converter comprises generator side converter unit and grid side converter cell; Between said generator side converter unit and grid side converter cell, also be parallel with dc capacitor; Stator in the said double-fed asynchronous generator, rotor are the Wound-rotor type structure, and wherein stator directly is connected with said three phase network, and rotor is connected with generator side converter unit, and the grid side converter cell is connected with three phase network; And other equipment in the said current power generation system except that water turbine and pedestal all are arranged in the said sealed compartment.
Further, said exciter converter adopts two level full-bridge type structures back-to-back; Wherein generator side converter unit is identical with the grid side converter cell, includes the brachium pontis of three parallel connections, and each brachium pontis is formed by the IGBT module of two end-to-end series connection; Each IGBT module is composed in parallel by an IGBT and a backward dioded; The collector electrode of the IGBT of the upper end in each brachium pontis is connected with the anode of said dc capacitor; The emitter of the IGBT of the lower end in each brachium pontis is connected with the negative terminal of said dc capacitor.
Further, said grid side converter cell also comprises reactor, and the emitter of the upper end IGBT in each brachium pontis of reactor one end and grid side converter cell links to each other, and the other end links to each other with three phase network.
Further, said water turbine adopts two blades or three blade structures, and blade is distributed on the water wheels circumference of water turbine symmetrically.
In the utility model, water turbine is the device that energy by ocean current is converted into mechanical energy, is installed on the pedestal, adopts three blades or two blade structures.The quantity of blade and diameter are by needed power and sea water advanced definite.The rotating speed of water turbine and stressed can the adjusting through control system.
Main shaft is connected between water turbine, step-up gear and the double-fed asynchronous generator, with the transmission of power of water turbine to step-up gear and double-fed asynchronous generator.
Step-up gear is between water turbine and the double-fed asynchronous generator, converts big moment, the slow-speed of revolution of water turbine into the little moment of double-fed asynchronous generator, high rotating speed, drives the rotation of double-fed asynchronous generator rotor high-speed.The speed increasing ratio of step-up gear is confirmed according to the rotating speed of double-fed asynchronous generator and the design speed of water turbine.
The stator of double-fed asynchronous generator, rotor all adopt the Wound-rotor type structure, and wherein stator is connected three phase network, and rotor connects with exciter converter, and the voltage magnitude of stator, frequency, phase place and output power can be controlled by exciter converter; Exciter converter adopts back to back structure, can realize the energy two-way flow.
The double-fed asynchronous generator variable speed constant frequency type current power generation system of the utility model; Can be according to the requirement of catching maximum energy by ocean current; Under the situation that seawater velocity changes, regulate rotational speed of water turbine in real time; Make it to operate in all the time on the optimum speed corresponding, thereby improved system's generating efficiency, optimized the operating conditions of system with this seawater velocity; Also can control and realize good flexibly connecting between generator and the network system, can reduce the impact amplitude of grid-connected current than traditional constant-speed and constant-frequency power generation system through exciter converter; The exciter converter capacity is merely the slip power of system's output rated power, can significantly reduce the development difficulty and the cost of current transformer.
Through accompanying drawing and embodiment, the technological scheme of the utility model is done further detailed description below.
Description of drawings
Fig. 1 is the structural representation of the double-fed asynchronous generator variable speed constant frequency type current power generation system of the utility model.
Embodiment
Describe below in conjunction with the preferred embodiment of accompanying drawing, should be appreciated that preferred embodiment described herein only is used for explanation and explains the utility model, and be not used in qualification the utility model the utility model.
As shown in Figure 1; The double-fed asynchronous generator variable speed constant frequency type current power generation system of the utility model; Being incorporated into the power networks with three phase network is connected, and comprises water turbine 1, pedestal (not shown), main shaft 2, step-up gear 3, double-fed asynchronous generator 4, exciter converter and sealed compartment (not shown); Water turbine 1 is installed on the pedestal; It adopts two blades or three blade structures, and blade is distributed on the water wheels circumference of water turbine 1 symmetrically; Main shaft 2 is connected between water turbine 1, step-up gear 3 and the double-fed asynchronous generator 4; Stator 4a, rotor 4b in the double-fed asynchronous generator 4 are the Wound-rotor type structure, and wherein stator 4a directly connects with three phase network, and rotor 4b is connected with three phase network through exciter converter.
Exciter converter comprises generator side converter unit that is connected with double-fed asynchronous generator 1 and the grid side converter cell that is connected with three phase network; Between generator side converter unit and grid side converter cell, also be parallel with dc capacitor 11.
Exciter converter adopts two level full-bridge type structures back-to-back; Wherein generator side converter unit comprises the brachium pontis of three parallel connections; Each brachium pontis is by the IGBT module (5,8 of two end-to-end series connection; 6,9; 7,10) form; Each IGBT module 5,6,7,8,9,10 is composed in parallel by an IGBT and a backward dioded; The IGBT5 of the upper end in each brachium pontis, 6,7 collector electrode are connected with the anode of dc capacitor 11; The IGBT8 of the lower end in each brachium pontis, 9,10 emitter are connected with the negative terminal of dc capacitor 11.The grid side converter cell also comprises the brachium pontis of three parallel connections; Each brachium pontis is by the IGBT module (12,15 of two end-to-end series connection; 13,16; 14,17) form; Each IGBT module 12,13,14,15,16,17 is composed in parallel by an IGBT and a backward dioded; The IGBT12 of the upper end in each brachium pontis, 13,14 collector electrode are connected with the anode of dc capacitor 11; The IGBT15 of the lower end in each brachium pontis, 16,17 emitter are connected with the negative terminal of dc capacitor 11.
The grid side converter cell also comprises reactor 18, and the upper end IGBT12,13 in each brachium pontis of reactor 18 1 ends and grid side converter cell, 14 emitter link to each other; The other end links to each other with three phase network or transformer.
Other equipment in the current power generation system of the foregoing description except that water turbine 1 and pedestal all are arranged in the sealed compartment.Simultaneously, in order to realize the application of this generator system at the energy by ocean current power field, all devices all should be taken into account anti-seawater corrosion, and water turbine 1 also should have waterproof biological attachment function.
The working principle of the current power generation system of the utility model is: the active force that the blade of water turbine receives ocean current is rotated; Step-up gear is transformed to high rotating speed, little moment with the slow-speed of revolution of water turbine, big moment, drives generator operation in the permission speed range of generating.Stator output voltage amplitude, frequency and phase place are at first regulated in generator side converter unit, make it satisfy the requirement of being incorporated into the power networks; Behind generator connecting in parallel with system, the size of generator side converter unit regulator generator stator output wattless power and active power is to the electrical network transmission of electric energy; When generator speed was lower than synchronous speed, exciting power was carried to generator in generator side converter unit; When generator speed was higher than with leg speed, the rotor of generator can get into generating state, and transferred energy to electrical network through exciter converter.
In operation of electric power system, water turbine at first starts work, and is conditioned and is in than slow-speed of revolution running state, behind step-up gear, drives generator idle running; Simultaneously, the grid side converter cell starts, and runs on rectification state, keeps the stable of VDC; Then, generator side converter unit starting is regulated the stator voltage of generator, makes it satisfy the requirement of being incorporated into the power networks; Behind generator connecting in parallel with system; Regulate the stress and the rotating speed of water turbine, make generator be in the generator operation state, the power of generator side converter unit regulator generator output; The grid side converter cell gets into rectification or inverter mode automatically according to the rotating speed size of generator.
What should explain at last is: the above is merely the preferred embodiment of the utility model; Be not limited to the utility model; Although the utility model has been carried out detailed explanation with reference to previous embodiment; For a person skilled in the art, it still can be made amendment to the technological scheme that previous embodiment is put down in writing, and perhaps part technical characteristics wherein is equal to replacement.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.
Claims (4)
1. a double-fed asynchronous generator variable speed constant frequency type current power generation system is characterized in that being incorporated into the power networks with three phase network is connected, and comprises water turbine, pedestal, main shaft, step-up gear, double-fed asynchronous generator, exciter converter and sealed compartment;
Said water turbine is installed on the pedestal, and main shaft is connected between water turbine, step-up gear and the double-fed asynchronous generator;
Said exciter converter comprises generator side converter unit and grid side converter cell; Between said generator side converter unit and grid side converter cell, also be parallel with dc capacitor;
Stator in the said double-fed asynchronous generator, rotor are the Wound-rotor type structure, and wherein stator directly is connected with said three phase network, and rotor is connected with generator side converter unit, and the grid side converter cell is connected with three phase network;
And other equipment in the said current power generation system except that water turbine and pedestal all are arranged in the said sealed compartment.
2. current power generation according to claim 1 system is characterized in that, said exciter converter adopts two level full-bridge type structures back-to-back; Wherein generator side converter unit is identical with the grid side converter cell, includes the brachium pontis of three parallel connections, and each brachium pontis is formed by the IGBT module of two end-to-end series connection; Each IGBT module is composed in parallel by an IGBT and a backward dioded; The collector electrode of the IGBT of the upper end in each brachium pontis is connected with the anode of said dc capacitor; The emitter of the IGBT of the lower end in each brachium pontis is connected with the negative terminal of said dc capacitor.
3. current power generation according to claim 2 system; It is characterized in that; Said grid side converter cell also comprises reactor, and the emitter of the upper end IGBT in each brachium pontis of reactor one end and grid side converter cell links to each other, and the other end links to each other with three phase network.
4. according to claim 1,2 or 3 described current power generation systems, it is characterized in that said water turbine adopts two blades or three blade structures, blade is distributed on the water wheels circumference of water turbine symmetrically.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202104929U CN202117834U (en) | 2011-06-21 | 2011-06-21 | Double-fed asynchronous generator variable-speed constant-frequency type ocean current power-generating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202104929U CN202117834U (en) | 2011-06-21 | 2011-06-21 | Double-fed asynchronous generator variable-speed constant-frequency type ocean current power-generating system |
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| Publication Number | Publication Date |
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| CN202117834U true CN202117834U (en) | 2012-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011202104929U Expired - Lifetime CN202117834U (en) | 2011-06-21 | 2011-06-21 | Double-fed asynchronous generator variable-speed constant-frequency type ocean current power-generating system |
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| CN (1) | CN202117834U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103485966A (en) * | 2013-09-06 | 2014-01-01 | 中国能源建设集团广东省电力设计研究院 | Wave power generation unit |
| CN105257460A (en) * | 2014-04-24 | 2016-01-20 | 南通大学 | Modularized multiphase ocean current generator unit provided with fault tolerant structures mounted in phase staggering manner |
-
2011
- 2011-06-21 CN CN2011202104929U patent/CN202117834U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103485966A (en) * | 2013-09-06 | 2014-01-01 | 中国能源建设集团广东省电力设计研究院 | Wave power generation unit |
| CN103485966B (en) * | 2013-09-06 | 2016-08-10 | 中国能源建设集团广东省电力设计研究院有限公司 | Wave energy generating set |
| CN105257460A (en) * | 2014-04-24 | 2016-01-20 | 南通大学 | Modularized multiphase ocean current generator unit provided with fault tolerant structures mounted in phase staggering manner |
| CN105402078A (en) * | 2014-04-24 | 2016-03-16 | 南通大学 | High-transmission-efficiency spiral-type permanent magnet bearing fault-tolerant structure ocean current generator |
| CN105257460B (en) * | 2014-04-24 | 2017-09-22 | 南通大学 | Modularization misphase installs multiphase fault-tolerant structure ocean current power generation unit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120118 |
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| CX01 | Expiry of patent term |