CN201821117U - Wind farm access device based on low-frequency transmission and high-voltage DC (direct current) transmission - Google Patents
Wind farm access device based on low-frequency transmission and high-voltage DC (direct current) transmission Download PDFInfo
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- CN201821117U CN201821117U CN201020531928XU CN201020531928U CN201821117U CN 201821117 U CN201821117 U CN 201821117U CN 201020531928X U CN201020531928X U CN 201020531928XU CN 201020531928 U CN201020531928 U CN 201020531928U CN 201821117 U CN201821117 U CN 201821117U
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Abstract
The utility model discloses a wind farm power network access device based on low-frequency transmission and high-voltage DC transmission. The device is used for inputting low frequency electricity generated by wind turbine generators to low frequency transformers for voltage transformation through low frequency cables firstly, rectification is performed on low frequency electricity obtained after voltage transformation, then the DC obtained after the low frequency electricity is rectified is transmitted to an inverter through DC cables and is converted into power frequency electricity which is transmitted to a power frequency booster transformer through power frequency cables, and high voltage electricity obtained after voltage boosting is transmitted to a power network. The device comprises the wind turbine generators, the low frequency cables, the low frequency box type transformers, rectifiers, the DC cables, the inverter, the power frequency cables and the power frequency booster transformer. By adopting the utility model, the transmission capacity and the transmission distance of the power network accessed to the wind farm are increased, and the grid-connected power quality of the wind farm is improved; the total line loss is reduced; and the power transmission efficiency is improved.
Description
Technical field
The utility model relates to electric power system medium and low frequency (frequency is lower than power frequency 50Hz) transmission of electricity and high voltage dc transmission technology field, particularly a kind of wind energy turbine set access device based on low frequency power transmission and high voltage direct current transmission.
Background technology
Because the randomness of wind resource and 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 influence to the electrical network quality of power supply must cause enough attention.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 because the influence 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 to improve the wind farm grid-connected quality of power supply, but because of repeatedly adopting the high-power electric and electronic convertor assembly, makes the system configuration complexity, project cost height, loss increasing.
Summary of the invention
The utility model proposes a kind of new wind energy turbine set based on low frequency power transmission and high voltage direct current transmission and insert the electrical network device, its purpose is to overcome the problem of the deficiencies in the prior art and existence, and this device has reduced the circuit total losses, has improved power transmission efficiency; Transmission range and transmission capacity that wind energy turbine set inserts electrical network can either be increased, the quality of power supply that wind energy turbine set inserts the electrical network place can be improved again; Simultaneously, the combination of low frequency power transmission and high voltage dc transmission technology has reduced project cost, especially is fit to be applied to the large-scale wind power field.
The purpose of this utility model is achieved through the following technical solutions: based on the wind energy turbine set access device of low frequency power transmission and high voltage direct current transmission, it is characterized in that: comprise the low frequency power transport module, direct current power transport module and the power frequency electric power transport module that are electrically connected successively, described low frequency power transport module is made up of low-frequency cable, wind-driven generator, low-frequency transformer and rectifier, one end of described low-frequency transformer is connected with wind-driven generator by low-frequency cable, and the other end of described low-frequency transformer is connected with rectifier by low-frequency cable; Described direct current power transport module is made up of inverter, is connected by direct current cables between described inverter and the rectifier; Described power frequency electric power transport module is made up of duplex frequency boostering transformer, is connected by the power frequency cable between described duplex frequency boostering transformer and the inverter, and duplex frequency boostering transformer inserts electrical network by the power frequency cable again.
In technique scheme, described wind-driven generator is provided with two or more, each wind-driven generator is connected to a low-frequency transformer of configuration with it through low-frequency cable respectively, and two or more low-frequency transformers is connected with a rectifier by low-frequency cable.
In technique scheme, described rectifier has 2 to 10, and whole rectifiers is connected with an inverter by direct current cables.
The utlity model has following advantage:
1) adopt the low frequency power transmission technology, the wind-driven generator outlet directly connects the low frequency box type transformer and carries out the low frequency energy transmission, need not the conventional frequency converter of installing between wind-driven generator outlet and power frequency box type transformer, has reduced project cost, has reduced energy loss.
2) device that adopts low frequency power transmission and high voltage dc transmission technology to combine, low frequency power transmission makes line loss reduce to some extent because of having reduced line impedance, and direct current transportation is little because of the lead active loss of adopting same cross-sectional, therefore, reduce the circuit total losses, improved power transmission efficiency.
3) adopt high voltage dc transmission technology, 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.
4) distribution of low-frequency transmission circuit distance and high voltage direct current transmission line distance can be determined flexibly according to the actual conditions of engineering and in conjunction with the characteristics of two kinds of technology of transmission of electricitys.
5) centralized control of rectifier can realize the reasonable adjusting of the every typhoon group of motors of wind energy turbine set active power.
6) centralized control of inverter can realize the reasonable adjusting of the every typhoon group of motors of wind energy turbine set reactive power.
7) utilize inverter to improve the quality of power supply that wind energy turbine set inserts the electrical network place.
8) the AC network voltage at direct current cables two ends is all controlled, thereby allows the AC network and the electrical network of wind energy turbine set to keep asynchronous operation, in case after network breaks down, can return to the preceding ability to transmit electricity of fault rapidly.
Description of drawings
Fig. 1 is the wind energy turbine set access electrical network schematic diagram of device of the utility model based on low frequency power transmission and high voltage dc transmission technology.
Fig. 2 is the structural representation of the embodiment of Fig. 1.
Among the figure: 1. wind-driven generator, 2. low-frequency cable, 3. low-frequency transformer, 4. rectifier, 5. direct current cables, 6. inverter, 7. power frequency cable, 8. duplex frequency boostering transformer, 9. electrical network, A. low frequency power transport module, B. direct current power transport module, C. power frequency electric power transport module.
Embodiment
Describe performance of the present utility model in detail below in conjunction with accompanying drawing, but they do not constitute to qualification of the present utility model, only do for example.Simultaneously by illustrating that advantage of the present utility model will become clear more and understanding easily.
Consult accompanying drawing as can be known: the utility model is based on the wind energy turbine set access device of low frequency power transmission and high voltage direct current transmission, comprise low frequency power transport module A, the direct current power transport module B and the power frequency electric power transport module C that are electrically connected successively, described low frequency power transport module A is made up of low-frequency cable 2, wind-driven generator 1, low-frequency transformer 3 and rectifier 4, one end of described low-frequency transformer 3 is connected with wind-driven generator 1 by low-frequency cable 2, and the other end of described low-frequency transformer 3 is connected with rectifier 4 by low-frequency cable 2; Described direct current power transport module B is made up of inverter 6, is connected by direct current cables 5 between described inverter 6 and the rectifier 4; Described power frequency electric power transport module C is made up of duplex frequency boostering transformer 8, is connected by power frequency cable 7 between described duplex frequency boostering transformer 8 and the inverter 6, and duplex frequency boostering transformer 8 inserts electrical networks 9 by power frequency cable 7 again.
Described wind-driven generator 1 is provided with two or more, and each wind-driven generator 1 is connected to a low-frequency transformer 3 of configuration with it through low-frequency cable 2 respectively, and two or more low-frequency transformers 3 are connected with a rectifier 4 by low-frequency cable 2.
Described rectifier 4 has 2 to 10 (also can increasing as required or reduce), and whole rectifiers 4 are connected with an inverter 6 by direct current cables 5.
As shown in Figure 1, wind energy turbine set access device based on low frequency power transmission and high voltage direct current transmission of the present utility model, this device comprises that (one), wind-driven generator send low frequency power, and low frequency power inputs to the low-frequency transformer transformation by low-frequency cable, and the low frequency electricity after the transformation carries out rectification; (2), the direct current that carries out after the rectification of low frequency electricity is delivered to inverter via direct current cables, and direct current is converted to power frequency; (3), the power frequency electricity is delivered to duplex frequency boostering transformer via the power frequency cable, the high-tension electricity after boosting is delivered to electrical network.
This device comprises wind-driven generator 1, low-frequency cable 2, low frequency box type transformer 3, rectifier 4, direct current cables 5, inverter 6, power frequency cable 7 and duplex frequency boostering transformer 8.The low frequency power that wind-driven generator 1 sends is connected to low frequency box type transformer 3 through low-frequency cable 2, is connected to rectifier 4 again, and this process is the low frequency power transmission course.Adopt the low frequency power transmission technology, the wind-driven generator outlet directly connects the low frequency box type transformer and carries out the low frequency energy transmission, need not the conventional frequency converter of installing between wind-driven generator outlet and power frequency box type transformer, has reduced project cost.Low frequency power transmission can improve transmission capacity because of having reduced the transmission system frequency, thereby only needs less transmission line can reduce construction investment when carrying identical power.Rectifier 4 is converted to direct current power with low frequency power, and is connected to inverter 6 through direct current cables 5, and this process is the direct current power transmission course.Direct current transportation can be carried more high-power because of the lead that adopts same cross-sectional and active loss is little, is fit to very much the electric power transfer of remote big capacity wind energy turbine set.Inverter 6 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 inserts electrical network.Inverter 6 is converted to power frequency electric power with direct current power, and is connected to duplex frequency boostering transformer 8 through power frequency cable 7, is connected to electrical network 9 at last.
A rectification type of the line configuring wind energy turbine set of confluxing that is illustrated in figure 2 as based on low frequency power transmission and high voltage dc transmission technology inserts the electrical network device.The whole wind electric field comprises (M
1+ M
2+---+M
N) typhoon power generator 1, the N bar circuit that confluxes.Low frequency box type transformer of every typhoon power generator 1 configuration, every the rectifier 4 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 rectifier 4 after low frequency box type transformer 3 carries out low-frequency transmission.Rectifier 4 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; Rectifier 4 can also be realized the Redundant Control to wind-driven generator 1.Rectifier 4 is converted to direct current power with low frequency power, and direct current power confluxes through the N bar and delivers to inverter 6 after circuit confluxes, and inverter 6 is converted to power frequency electric power with direct current power, and is connected to duplex frequency boostering transformer 8 through power frequency cable 7, is connected to electrical network 9 at last.
Claims (3)
1. based on the wind energy turbine set access device of low frequency power transmission and high voltage direct current transmission, it is characterized in that: comprise the low frequency power transport module (A) that is electrically connected successively, direct current power transport module (B) and power frequency electric power transport module (C), described low frequency power transport module (A) is by low-frequency cable (2), wind-driven generator (1), low-frequency transformer (3) and rectifier (4) are formed, one end of described low-frequency transformer (3) is connected with wind-driven generator (1) by low-frequency cable (2), and the other end of described low-frequency transformer (3) is connected with rectifier (4) by low-frequency cable (2); Described direct current power transport module (B) is made up of inverter (6), is connected by direct current cables (5) between described inverter (6) and the rectifier (4); Described power frequency electric power transport module (C) is made up of duplex frequency boostering transformer (8), is connected by power frequency cable (7) between described duplex frequency boostering transformer (8) and the inverter (6), and duplex frequency boostering transformer (8) inserts electrical network (9) by power frequency cable (7) again.
2. the wind energy turbine set access device based on low frequency power transmission and high voltage direct current transmission according to claim 1, it is characterized in that described wind-driven generator (1) is provided with two or more, each wind-driven generator (1) is connected to a low-frequency transformer (3) of configuration with it through low-frequency cable (2) respectively, and two or more low-frequency transformer (3) is connected with a rectifier (4) by low-frequency cable (2).
3. the wind energy turbine set access device based on low frequency power transmission and high voltage direct current transmission according to claim 2 is characterized in that described rectifier (4) has 2 to 10, and whole rectifier (4) is connected with an inverter (6) by direct current cables (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020531928XU CN201821117U (en) | 2010-09-16 | 2010-09-16 | Wind farm access device based on low-frequency transmission and high-voltage DC (direct current) transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020531928XU CN201821117U (en) | 2010-09-16 | 2010-09-16 | Wind farm access device based on low-frequency transmission and high-voltage DC (direct current) transmission |
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| Publication Number | Publication Date |
|---|---|
| CN201821117U true CN201821117U (en) | 2011-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020531928XU Expired - Lifetime CN201821117U (en) | 2010-09-16 | 2010-09-16 | Wind farm access device based on low-frequency transmission and high-voltage DC (direct current) transmission |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109787277A (en) * | 2018-12-28 | 2019-05-21 | 清华大学 | Power grid method is accessed based on the wind power plant direct current transportation that midfrequent AC bus collects |
-
2010
- 2010-09-16 CN CN201020531928XU patent/CN201821117U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109787277A (en) * | 2018-12-28 | 2019-05-21 | 清华大学 | Power grid method is accessed based on the wind power plant direct current transportation that midfrequent AC bus collects |
| CN109787277B (en) * | 2018-12-28 | 2021-07-16 | 清华大学 | Method for accessing wind power plant direct-current transmission into power grid based on medium-frequency alternating-current bus collection |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110504 |