CN203278265U - Power transmission device of wind power plant based on medium- or high-frequency voltage transformation of transformer - Google Patents
Power transmission device of wind power plant based on medium- or high-frequency voltage transformation of transformer Download PDFInfo
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- CN203278265U CN203278265U CN2013202650128U CN201320265012U CN203278265U CN 203278265 U CN203278265 U CN 203278265U CN 2013202650128 U CN2013202650128 U CN 2013202650128U CN 201320265012 U CN201320265012 U CN 201320265012U CN 203278265 U CN203278265 U CN 203278265U
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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
- Y02E40/40—Arrangements for reducing harmonics
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The utility model relates to a power transmission device of a wind power plant based on medium- or high-frequency voltage transformation of a transformer. The device comprises a medium- or high-frequency power conversion device, a high-frequency power transmission module, a direct current power transmission module and a power frequency power transmission module, wherein the above four parts are successively connected. The output end of the medium- or high-frequency power conversion device is connected with the high-frequency power transmission module. The output end of the high-frequency power transmission module is connected with the direct current power transmission module through direct current cables. The direct current power transmission module is connected with the power frequency power transmission module through power frequency cables. The device prevents a harmonic current at a load side from entering a power supply side through direct coupling of a transformer, and prevents voltage at the power supply side from dropping, flickering, being unbalanced and directly affecting the load side in the presence of harmonic waves. The device improves electric power quality at a part where a wind power plant is connected with a power grid, reduces transmission loss between a wind power generator and a box-type transformer, reduces basic bearing capacity of a wind power generation set on the sea, and reduces environmental pollution.
Description
Technical field
The utility model relates in electric power system intermediate frequency or high frequency, and (frequency is greater than power frequency 50Hz, intermediate frequency or high frequency are generally the integral multiple of power frequency 50Hz) transformer technology and electric and electronic technical field, particularly a kind of in wind energy turbine set based on the wind energy turbine set power transmitting device of intermediate frequency or high frequency transformer transformation.
Background technology
Traditional power frequency electric power volume of transformer that in wind energy turbine set, box step-up transformer adopts is large, Heavy Weight, and transformer insulation oil exists environment and threatens, and no-load loss is high, and when load switching or wide variation, load side voltage is large with load fluctuation; No matter be that mains side or load side break down, opposite side all will be affected; Mains side voltage falls, flickering, imbalance and all will directly have influence on load side when containing harmonic wave, and the harmonic current of load side also can enter by the direct-coupling of transformer mains side; The harmonic current that produces during core sataration will cause harmonic pollution to electrical network.And the randomness of wind resource requires the no-load loss of box step-up transformer in wind energy turbine set low as far as possible; Along with the continuous increase of wind energy turbine set single-machine capacity, will become increasing, weight of supporting box step-up transformer volume also will become more and more heavier with it; The basis of offshore wind farm unit had both increased cost also with corresponding increase, had strengthened again risk.Simultaneously, the continuous expansion of wind energy turbine set scale, how the exploitation successively of especially extensive marine wind electric field increases wind energy turbine set transmission capacity and transmission range and wind farm grid-connected impact on the electrical network quality of power supply must cause enough attention.
The intermediate frequency that wind energy turbine set adopts or high frequency transformer no-load loss is low satisfy in wind power generation transformer noload losses should alap requirement, volume is little, the lightweight bearing capacity that can reduce offshore wind farm unit basis, is convenient to the integrated of box type transformer and wind-powered electricity generation unit; The combination of intermediate frequency or high frequency transformer and converters will improve the wind farm grid-connected quality of power supply, improve Systems balanth.At present, wind energy turbine set is because scale is all less, and the general ac cable that installs reactive power compensator additional that adopts transmits and net mode.But due to the impact of ac cable charging current, transmission range and transmission capacity that the ac cable transmission is incorporated into the power networks are restricted.Wind energy turbine set adopts high voltage dc transmission technology will further improve the wind farm grid-connected quality of power supply.
Summary of the invention
The utility model proposes a kind of wind energy turbine set power transmitting device based on intermediate frequency or high frequency transformer transformation, its purpose is to overcome the problem of the deficiencies in the prior art and existence, the harmonic current that this device can suppress load side enters mains side by the direct-coupling of transformer, prevent that mains side voltage from falling, flickering, imbalance and directly have influence on load side when containing harmonic wave, improved the quality of power supply at wind energy turbine set access electrical network place and the operational environment of box type transformer; Can reduce the loss of transformer; Can either increase transmission range and the transmission capacity of wind energy turbine set access electrical network, can alleviate again the bearing capacity on offshore wind farm unit basis, be convenient to the integrated of box type transformer and wind-powered electricity generation unit.
The purpose of this utility model is achieved through the following technical solutions:
Wind energy turbine set power transmitting device based on intermediate frequency or high frequency transformer transformation, comprise the medium-high frequency power switching module, High frequency power transport module, direct current power transport module and the power frequency electric power transport module that connect in turn, described medium-high frequency power switching module output connects the High frequency power transport module by high frequency cable, the output of described High frequency power transport module is connected with the direct current power transport module by direct current cables, and described direct current power transport module connects the power frequency electric power transport module by the power frequency cable.
In technique scheme, described High frequency power modular converter comprises wind-driven generator, low-frequency cable, one-level rectifier, direct current cables, square-wave modulator, the input of described one-level rectifier is connected with the output of wind-driven generator by low-frequency cable, and the output of described one-level rectifier is connected with the input of square-wave modulator by direct current cables.
Above-mentioned High frequency power transport module comprises intermediate frequency or high frequency transformer, high frequency cable and secondary rectifier, the input of described intermediate frequency or high frequency transformer is connected with square-wave modulator by high frequency cable, and the output of described intermediate frequency or high frequency transformer is connected by the input of high frequency cable with the secondary rectifier.
Above-mentioned direct current power transport module comprises inverter, and the input of described inverter connects the secondary rectifier by direct current cables.
Above-mentioned power frequency electric power transport module comprises duplex frequency boostering transformer, and the input of described duplex frequency boostering transformer is connected with inverter by the power frequency cable, and duplex frequency boostering transformer is by power frequency cable access electrical network.
Above-mentioned medium-high frequency power switching module be provided with one group or more than, square-wave modulator in every group of medium-high frequency power switching module is all via the input of a high frequency cable and intermediate frequency or high frequency transformer, the output of a plurality of intermediate frequencies or high frequency transformer connects the input of a secondary rectifier, and the output of a plurality of secondary rectifiers connects the input of an inverter by direct current cables
The utlity model has following beneficial effect:
1) compare with the power frequency box type transformer, intermediate frequency or high frequency transformer volume are little, lightweight, because under same capability, transformer (magnetic core) size is inversely proportional to its operating frequency, and frequency is higher, and volume is just less.
2) intermediate frequency or high frequency transformer volume are little, lightweight, can reduce the bearing capacity on offshore wind farm unit basis, are convenient to especially cabin integrated of box type transformer and wind-powered electricity generation unit, have reduced the loss between wind-powered electricity generation set generator and box type transformer.
3) adopt the intermediate frequency of non-crystalline material or high frequency transformer no-load loss is low, efficient can do more, and has reduced loss, satisfy that in wind power generation, transformer noload losses should alap requirement.
4) combination of intermediate frequency or high frequency transformer and the converters harmonic current that can effectively suppress load side enters mains side by the direct-coupling of transformer, can prevent effectively again that mains side voltage from falling, flickering, imbalance and directly have influence on load side when containing harmonic wave.
5) combination of intermediate frequency or high frequency transformer and converters can reduce harmonic pollution, again can environmental contamination reduction.
6) high voltage direct current transmission is little because of the wire active loss of adopting same cross-sectional, therefore, has reduced the circuit total losses, has improved power transmission efficiency.
7) inverter itself is exactly a reactive power generator, both can send lagging reactive power, can absorb lagging reactive power again, need not to install separately reactive power compensator.
8) centralized control of inverter can realize the comprehensive adjustment function of wind energy turbine set every typhoon group of motors active power and reactive power.
9) utilize inverter can improve Systems balanth to the voltage of access electrical network or effective control of current amplitude and phase angle.
10) compare with the marine wind electric field access electrical network method that adopts the box power transformer of power frequency and high voltage dc transmission technology, this device has reduced loss, has reduced project cost.
Description of drawings
Fig. 1 is that the utility model is based on the wind energy turbine set power transmitting device schematic diagram of intermediate frequency or high frequency transformer transformation.
Fig. 2 is the schematic diagram of specific embodiment.
In figure: 1, wind-driven generator, 2, low-frequency cable, 3, the one-level rectifier, 4, direct current cables, 5, square-wave modulator, 6, high frequency cable, 7, intermediate frequency or high frequency transformer, 8, the secondary rectifier, 9, inverter, 10, the power frequency cable, 11, duplex frequency boostering transformer, 12, electrical network.
Embodiment
Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing, but they do not consist of to restriction of the present utility model, only for example.Simultaneously by illustrating that advantage of the present utility model will become more clear and easily understand.
As shown in Figure 1, the utility model is based on the wind energy turbine set power transmitting device of intermediate frequency or high frequency transformer transformation, comprise the medium-high frequency power switching module, High frequency power transport module, direct current power transport module and the power frequency electric power transport module that connect in turn, medium-high frequency power switching module output connects the High frequency power transport module by high frequency cable 6, the output of High frequency power transport module is connected with the direct current power transport module by direct current cables 4, and the direct current power transport module connects the power frequency electric power transport module by power frequency cable 10.
The High frequency power modular converter comprises wind-driven generator 1, low-frequency cable 2, one-level rectifier 3, direct current cables 4, square-wave modulator 5, the input of one-level rectifier 3 is connected with the output of wind-driven generator 1 by low-frequency cable 2, and the output of one-level rectifier 3 is connected with the input of square-wave modulator 5 by direct current cables 4.The High frequency power transport module comprises intermediate frequency or high frequency transformer 7, high frequency cable 6 and secondary rectifier 8, the input of described intermediate frequency or high frequency transformer 7 is connected with square-wave modulator 5 by high frequency cable 6, and the output of described intermediate frequency or high frequency transformer 7 is connected with the input of secondary rectifier 8 by high frequency cable 6.The direct current power transport module comprises inverter 9, and the input of inverter 9 connects secondary rectifier 8 by direct current cables 4.The power frequency electric power transport module comprises duplex frequency boostering transformer 11, and the input of duplex frequency boostering transformer 11 is connected with inverter 9 by power frequency cable 10, and duplex frequency boostering transformer 11 is by power frequency cable 10 access electrical networks 12.
The medium-high frequency power switching module be provided with one group or more than, as shown in Figure 2, square-wave modulator 5 in every group of medium-high frequency power switching module is all via the input of a high frequency cable 6 and intermediate frequency or high frequency transformer 7, the output of a plurality of intermediate frequencies or high frequency transformer 7 connects the input of a secondary rectifier 8, and the output of a plurality of secondary rectifiers 8 connects the input of an inverter 9 by direct current cables 4.Article one, secondary rectification type wind energy turbine set access electric net device of the line configuring of confluxing.Whole wind energy turbine set comprises (M
1+ M
2+---+M
N) typhoon power generator 1, the N bar circuit that confluxes.Every typhoon power generator intermediate frequency of 1 configuration or high frequency transformer 7, every the secondary rectifier 8 of line configuring that confluxes, every M
i(i=1,2,---, N) low frequency power sent of typhoon power generator 1 is confluxed to corresponding secondary rectifier 8 after one-level rectifier 3, square-wave modulator 5 and intermediate frequency or high frequency transformer 7.Secondary rectifier 8 passes through corresponding M
iThe centralized control of carrying out typhoon power generator 1 can realize the reasonable adjusting to the active power of wind-driven generator 1; Secondary rectifier 8 can also be realized the Redundant Control to wind-driven generator 1.Secondary rectifier 8 is converted to direct current power with High frequency power, direct current power confluxes through the N bar and delivers to inverter 9 after circuit confluxes, inverter 9 is converted to power frequency electric power with direct current power, and is connected to duplex frequency boostering transformer 11 through power frequency cable 10, is connected at last electrical network 12.
Principle of the present utility model is: the low frequency power that wind-driven generator 1 sends is connected to one-level rectifier 3 through low-frequency cable 2, be connected to square-wave modulator 5 through direct current cables 4 again, be connected to intermediate frequency or high frequency transformer 7 through high frequency cable 6 again, this process is mainly low frequency power and is converted to the High frequency power process.The intermediate frequency or the high frequency transformer volume that adopt are little, lightweight, can reduce the bearing capacity on offshore wind farm unit basis, are convenient to especially cabin integrated of box type transformer and wind-powered electricity generation unit, have reduced the loss between wind-powered electricity generation set generator and box type transformer.The harmonic current that the combination of intermediate frequency or high frequency transformer 7 and one-level rectifier 3, secondary rectifier 8 can effectively suppress load side enters mains side by the direct-coupling of transformer, can prevent again that mains side voltage from falling, flickering, imbalance and directly have influence on load side when containing harmonic wave.Secondary rectifier 8 is converted to direct current power with High frequency power, and is connected to inverter 9 through direct current cables 4, and this process is that High frequency power is converted to the direct current power process.Direct current transportation can be carried more high-power because of the wire that adopts same cross-sectional and active loss is little, is fit to very much the electric power transfer of remote large capacity wind energy turbine set.Inverter 9 adopts suitable control strategy can realize the comprehensive adjustment of active power and reactive power and can improve the quality of power supply that wind energy turbine set accesses electrical network.Inverter 9 is converted to power frequency electric power with direct current power, and is connected to duplex frequency boostering transformer 11 through power frequency cable 10, is connected at last electrical network 12.
Claims (6)
1. based on the wind energy turbine set power transmitting device of intermediate frequency or high frequency transformer transformation, it is characterized in that: comprise the medium-high frequency power switching module, High frequency power transport module, direct current power transport module and the power frequency electric power transport module that connect in turn, described medium-high frequency power switching module output connects the High frequency power transport module by high frequency cable (6), the output of described High frequency power transport module is connected with the direct current power transport module by direct current cables (4), and described direct current power transport module connects the power frequency electric power transport module by power frequency cable (10).
2. the wind energy turbine set power transmitting device based on intermediate frequency or high frequency transformer transformation according to claim 1, it is characterized in that: described High frequency power modular converter comprises wind-driven generator (1), low-frequency cable (2), one-level rectifier (3), direct current cables (4), square-wave modulator (5), the input of described one-level rectifier (3) is connected with the output of wind-driven generator (1) by low-frequency cable (2), and the output of described one-level rectifier (3) is connected with the input of square-wave modulator (5) by direct current cables (4).
3. the wind energy turbine set power transmitting device based on intermediate frequency or high frequency transformer transformation according to claim 2, it is characterized in that: described High frequency power transport module comprises intermediate frequency or high frequency transformer (7), high frequency cable (6) and secondary rectifier (8), the input of described intermediate frequency or high frequency transformer (7) is connected with square-wave modulator (5) by high frequency cable (6), and the output of described intermediate frequency or high frequency transformer (7) is connected with the input of secondary rectifier (8) by high frequency cable (6).
4. the wind energy turbine set power transmitting device based on intermediate frequency or high frequency transformer transformation according to claim 3, it is characterized in that: described direct current power transport module comprises inverter (9), and the input of described inverter (9) connects secondary rectifier (8) by direct current cables (4).
5. the wind energy turbine set power transmitting device based on intermediate frequency or high frequency transformer transformation according to claim 4, it is characterized in that: described power frequency electric power transport module comprises duplex frequency boostering transformer (11), the input of described duplex frequency boostering transformer (11) is connected with inverter (9) by power frequency cable (10), and duplex frequency boostering transformer (11) is by power frequency cable (10) access electrical network (12).
6. the wind energy turbine set power transmitting device based on intermediate frequency or high frequency transformer transformation according to claim 2, it is characterized in that: described medium-high frequency power switching module be provided with one group or more than, square-wave modulator (5) in every group of medium-high frequency power switching module is all via the input of a high frequency cable (6) with an intermediate frequency or high frequency transformer (7), the output of a plurality of intermediate frequencies or high frequency transformer (7) connects the input of a secondary rectifier (8), the output of a plurality of secondary rectifiers (8) connects the input of an inverter (9) by direct current cables (4).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202650128U CN203278265U (en) | 2013-05-15 | 2013-05-15 | Power transmission device of wind power plant based on medium- or high-frequency voltage transformation of transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202650128U CN203278265U (en) | 2013-05-15 | 2013-05-15 | Power transmission device of wind power plant based on medium- or high-frequency voltage transformation of transformer |
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| CN203278265U true CN203278265U (en) | 2013-11-06 |
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| CN2013202650128U Expired - Lifetime CN203278265U (en) | 2013-05-15 | 2013-05-15 | Power transmission device of wind power plant based on medium- or high-frequency voltage transformation of transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2913905A1 (en) * | 2014-02-28 | 2015-09-02 | General Electric Company | DC power transmission systems and method of assembling the same |
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2013
- 2013-05-15 CN CN2013202650128U patent/CN203278265U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2913905A1 (en) * | 2014-02-28 | 2015-09-02 | General Electric Company | DC power transmission systems and method of assembling the same |
| CN104882912A (en) * | 2014-02-28 | 2015-09-02 | 通用电气公司 | DC power transmission systems and method of assembling the same |
| US9419536B2 (en) | 2014-02-28 | 2016-08-16 | General Electric Company | DC power transmission systems and method of assembling the same |
| CN104882912B (en) * | 2014-02-28 | 2019-05-14 | 通用电气公司 | DC transmission system and the method for assembling the system |
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Granted publication date: 20131106 |