CN204258624U - Switching magnetic-resistance wind-driven generator direct current output buck type electrical conversion systems - Google Patents
Switching magnetic-resistance wind-driven generator direct current output buck type electrical conversion systems Download PDFInfo
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- CN204258624U CN204258624U CN201420778296.5U CN201420778296U CN204258624U CN 204258624 U CN204258624 U CN 204258624U CN 201420778296 U CN201420778296 U CN 201420778296U CN 204258624 U CN204258624 U CN 204258624U
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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
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Abstract
Switching magnetic-resistance wind-driven generator direct current output buck type electrical conversion systems, comprising: switch reluctance generator and control system, buck circuit, electronic power switch, filter; The input opposite ends of the buck circuit described in the connection of output direct current positive and negative terminal of described switch reluctance generator and control system thereof, the electronic power switch described in the connection of wherein one end of two outputs of buck circuit, input one end of the filter described in other end connection of electronic power switch, another input of filter connects another output be not directly connected with electronic power switch and the negative terminal of buck circuit, and filter exports two ends and connects with other switched reluctance motor systems of wind energy turbine set; The utility model adopts switch reluctance generator to make wind-driven generator, and structure simple direct current output interface chopper circuit, and controllability is strong, especially has certain application value for marine wind electric field field.
Description
Technical field
The present invention relates to wind power generation field, especially Oversea wind power generation field, be specifically related to switch reluctance generator (the Switched Reluctance Generator adopting direct output of DC current energy, be called for short: SRG) be wind-driven generator, switch reluctance generator direct current output interface end adopts the system of voltage-dropping type chopper circuit.
Background technology
Clean, green, that environmental protection is mark wind power generation is the renewable energy power generation form given priority to both at home and abroad for many years.
China's land Wind Power Generation comparative maturity, offshore wind farm is at the early-stage, but is technically different from land wind-powered electricity generation; The development Experience in Europe tells us, and offshore wind farm is well worth doing!
The relative land of wind energy on the sea, wind speed is higher more stable, and Development volue is higher; Current China has started the design and construction of marine wind electric field, expects that the exploitation of following offshore wind farm will become the Main way of Wind Power Utilization.
But offshore wind farm is technically more complicated, and cost is higher, mostly need at present to build maritime transformer station at sea, and be connected with transformer station on the bank; Particularly, be different from land wind-powered electricity generation, offshore wind farm utilizes HVDC Transmission to become development and application trend, excellent.
Current Wind turbines is mainly based on double-fed asynchronous wind driven generator group with directly drive total power changing type permanent magnet synchronous wind generator group.Double-fed asynchronous wind driven generator group has good cost performance, but to the ride-through capability of electric network fault and enabling capabilities more weak, its driving-chain must have large gearbox, and this proposes harsher requirement to the reliability and maintainability of unit; Directly drive total power changing type permanent magnet synchronous wind generator group grid-connected by frequency converter, stronger to the ride-through capability of electric network fault, there is certain support electrical network ability, avoid the maintenance workload of gear box, reliability increases, but because its rotating speed is very low, along with the increase of power, the manufacturing process of multi-pole magneto alternator is complicated, and technical difficulty is large, and motor volume is large, cost is high, Attention problems cost is higher, and simultaneously along with the continuous increase of unit capacity, supporting frequency converter is expensive further increases its use cost.
Switch reluctance generator structure is simple, brushless on rotor, without winding, without permanent magnet; It is equivalent to a current source when running, and like this in certain range of speeds, output end voltage can not change along with the change of rotating speed, and this is very suitable for the wind energy conversion system of the variable-speed operation of current main-stream, can improve the utilization ratio of wind energy; The more important thing is that it directly sends as direct current, adapted to current offshore wind farm carries out electric power transfer trend needs in efficient direct current mode, eliminated rectification link; Due to these characteristics, switch reluctance generator can realize higher generating efficiency under wind-force Direct driver, thus eliminates gear box, makes whole power generation system structure more succinct, reliable, the development trend of this also wind generator system just; And in running, switch reluctance generator controllable parameter is many, as turn-on angle, hold-off angle control, Current cut control etc., the control strategy of more complicated can be realized easily, control output dc voltage and electric current flexibly, also greatly reduce the technostress of low voltage crossing; Visible, switch reluctance generator introduces offshore wind farm, meet the needs installing the offshore wind farm development difficult, cost is high, maintaining is difficult completely, the i.e. high efficiency conversion realizing wind energy, the simplicity of structure means the maintenance that higher reliability is less and lower installation cost and equipment purchase cost.
In recent years, the research and practice being used for wind power generation about switch reluctance generator also has, and emphasis exists: high power density switch reluctance generator, switching magnetic-resistance wind power generation maximum power tracking and controlling method and switch reluctance generator are used for the Controller gain variations etc. under wind power generation operating mode; But, with regard to the research of switch reluctance generator system dc output transform or practice seldom.
Domestic and international research shows, adopt high voltage direct current (High-Voltage Direct Current, be called for short: mode transferring electric power HVDC) is the most convenient economical for offshore wind farm, and voltage converter (Voltage Source Converter, be called for short: HVDC (VSC-HVDC) VSC) controls flexibly with it, volume is little, possess the features such as black start-up ability, is particularly suitable for the connection being applied to marine wind electric field and electrical network; The wind field that the existing HVDC of utilization is connected with electrical network all adopts the mode setting up a transformer station at sea, because current offshore power generator is all alternating current generator, the AC transformer that will be connected by every platform alternating current generating sets first boosts to middle pressure, then focus on maritime transformer station and convert direct current conveying to, connect AC network by after the inverter inversion of transformer station on the bank; Its complex structure, electric energy needs through the conversion repeatedly between AC and DC.
The design feature of Wind turbines itself is then considered in some research, directly DC network can be formed after a unsteady flow, by DC parallel network, electric energy is focused on marine DC boosting transformer station, then by direct current transmission ashore transformer station, last another mistake becomes connection AC network, this reduces system complexity, but be only omitted step-up transformer.
Further research shows, directly be connected in series each Wind turbines of direct current then more economically, can without the need to step-up transformer and maritime transformer station, multiple low-pressure air group of motors becomes required high voltage direct current after directly connecting, then be directly transferred to land transformer station by subsea DC cable, this kind of mode has become the study hotspot that marine wind electric field electric energy converges at present.
Summary of the invention
According to above background technology, the utility model, in conjunction with wind energy turbine set especially marine wind electric field, for DC series type wind field structure, proposes the simple voltage-dropping type transformation system of the unit output electric energy adopting switch reluctance generator as wind-driven generator.
The technical solution of the utility model is:
Switching magnetic-resistance wind-driven generator direct current output buck type electrical conversion systems, is made up of switch reluctance generator and control system 101 thereof, buck circuit 102, electronic power switch 103, filter 104, its technical characteristic is, the input opposite ends of the buck circuit 102 described in the connection of output direct current positive and negative terminal of described switch reluctance generator and control system 101 thereof, the electronic power switch 103 described in the connection of wherein one end of two outputs of buck circuit 102, input one end of the filter 104 described in other end connection of electronic power switch 103, another input of filter 104 connects another output be not directly connected with electronic power switch 103 and the negative terminal of buck circuit 102, filter 104 exports two ends and connects with other switched reluctance motor systems of wind energy turbine set.
Numerous switched reluctance motor system 1a, 1b ... output be all connected in series.
Described buck circuit 102, is made up of the first capacitor C1, the second capacitor C2, the first resistance R1, the second resistance R2, electronic power switch VT, Power Diode Pumped VD, reactor L, the 3rd resistance R3, its technical characteristic is, described first capacitor C1 is connected the both positive and negative polarity exported from switch reluctance generator and control system 101 thereof up and down respectively after connecting with described second capacitor C2, described first resistance R1 is connected the both positive and negative polarity exported from switch reluctance generator and control system 101 thereof up and down respectively after connecting with described second resistance R2, and the first resistance R1 first capacitor C1 relative to the second resistance R2 and the second capacitor C2 is away from the output of input and switch reluctance generator and control system 101 thereof, first capacitor C1 is connected with the middle series connection point of the first resistance R1 and the second resistance R2 with the middle series connection point of the second capacitor C2, described electronic power switch VT is series on positive polarity line, and directly connect the negative terminal of the first resistance R1 and described Power Diode Pumped VD respectively, the anode of Power Diode Pumped VD connects on the second resistance R2 and negative polarity line, described reactor L is series on positive polarity line, reactor L one end connects electronic power switch VT and Power Diode Pumped VD negative pole, the other end connects one end of described 3rd resistance R3, the other end of the 3rd resistance R3 exports as positive polarity, output negative pole is the negative polarity end of the input of this buck circuit 102.
Electronic power switch 103 is normally closed switch, when switch reluctance generator and control system 101 thereof or buck circuit 102 break down, or when wind-force is too small or excessive needs stop generating, is disconnected by electronic power switch 103.
Major technique effect of the present utility model is:
Switching magnetic-resistance wind-driven generator direct current output buck type electrical conversion systems of the present utility model, because switch reluctance generator directly sends direct current, eliminate rectification link, simplify the structure and reduce cost and improve reliability, also therefore, the full direct current be only truly based on the direct current transportation wind power plant of switch reluctance generator sends out transmission of electricity; And the advantage of direct current transportation is self-evident, the advantage that especially loss is little, it is also little that the direct current cables that the words under marine wind field environment adopt is layed in the pollution caused in seabed;
Current wind-driven generator is owing to being all almost alternating current generator, and the output of every platform generator adopts first rectification often, then inversion and adopt high frequency transformer boost after again rectification be direct current; Or generator is first step-up transformer boosting after sending alternating current, and then rectification isotype, and the former transformation of electrical energy is complicated, complex structure, and the latter is due to the bulky that exists of low-frequency transformer, and therefore the words of marine wind electric field often need to add to build maritime transformer station; And switching magnetic-resistance wind-driven generator direct current output buck type electrical conversion systems of the present utility model; structure is simple; compact; cost is low; consider the controllability flexibly that switch reluctance generator itself is unique and the regulating power of translation circuit (buck circuit 102) to voltage itself; and the protective effect of electronic power switch 103 during fault, so can not isolation link be considered.
According to the adjustment of the duty cycle of switching of electronic power switch VT, flexibly changing output dc voltage value, this is another adjustable part after the regulatory function of switch reluctance generator itself, can strengthen the low-voltage crossing of system and antijamming capability and wind field voltage regulation capability; Although it is lower that buck circuit 102 makes the switch reluctance generator of low pressure originally export, the high-voltage value that wind field voltage can reach required has then been raised in numerous switched reluctance motor system series connection.
The setting of filter 104, guarantees the steady of direct voltage and electric current.
Accompanying drawing explanation
Figure 1 shows that offshore wind farm field pattern of the present utility model.
Figure 2 shows that switching magnetic-resistance wind-driven generator direct current output buck type electrical conversion systems figure of the present utility model.
Figure 3 shows that buck circuit figure of the present utility model.
In figure: 1a, 1b ... 1n represents each switched reluctance motor system, and 2 represent submarine cable, and 3 represent transformer station on the bank, 101 representation switch reluctance generator and control system thereof, 102 represent buck circuit, and 103 represent electronic power switch, and 104 represent filter.
Embodiment
For tandem type marine wind electric field as shown in Figure 1, switched reluctance motor system 1a, 1b ... the switch reluctance generator driven for multiple wind energy conversion system and accordingly control and electrical energy changer, although the direct voltage that each switched reluctance motor system exports is low pressure, but numerous switched reluctance motor system series connection can form high direct voltage, be transferred to transformer station 3 on the bank via submarine cable 2, then be connected with external communication electrical network by after transformer station 3 inversion on the bank.
Switched reluctance motor system 1a, 1b, namely switching magnetic-resistance wind-driven generator direct current output buck type electrical conversion systems comprises switch reluctance generator and control system 101 thereof, buck circuit 102, electronic power switch 103, filter 104, as shown in Figure 2, switch reluctance generator and control system 101 thereof complete and control the conventional control of its own switch reluctance generator and MPPT maximum power point tracking, buck circuit 102 realizes step-down and adjustable, the direct current of filter 104 pairs of pre-output carries out the filtering of voltage and current, the effect of electronic power switch 103 disconnects when switched reluctance motor system need be shut down, closed during system cloud gray model.
Figure 3 shows that buck circuit 102, the effect of the first capacitor C1, the second capacitor C2 be switch reluctance generator is directly sent direct current filtering, voltage support, and in emergency circumstances suppress the effect of voltge surge, first resistance R1 and the second resistance R2 then plays the voltage balancing the first capacitor C1 and the second capacitor C2 respectively, protect the voltage uniform of these two capacitors, safety, the effect of simultaneously stability first capacitor C1 and the unnecessary electric energy of the second capacitor C2; The resistance of the first resistance R1 and the second resistance R2 is quite high, should in hundred M Ω ranks, because the larger power loss that causes of the too small meeting of resistance have the possibility of overcurrent.
As shown in Figure 3, electronic power switch VT can be IGBT, or other controlled power electronic device, as thyristor, according to thyristor, need arrange the auxiliary circuit that thyristor turns off; When electronic power switch VT closes conducting, output voltage equals input voltage, when electronic power switch VT disconnects, due to the afterflow effect of Power Diode Pumped VD, output voltage is zero, when reactor L inductance value is enough large, along with the regular switch motion of electronic power switch VT, obvious output voltage average value reduces, and output current value is then comparatively steady; In Fig. 3, the 3rd resistance R3 is as the power resistor of little resistance, and its effect is the reactive absorption effect of current protection and reactor L if desired.
Claims (3)
1. switching magnetic-resistance wind-driven generator direct current output buck type electrical conversion systems, is made up of switch reluctance generator and control system (101) thereof, buck circuit (102), electronic power switch (103), filter (104), its technical characteristic is, the input opposite ends of the buck circuit (102) described in the connection of output direct current positive and negative terminal of described switch reluctance generator and control system (101) thereof, the electronic power switch (103) described in the connection of wherein one end of two outputs of buck circuit (102), input one end of the filter (104) described in other end connection of electronic power switch (103), another input of filter (104) connects another output be not directly connected with electronic power switch (103) and the negative terminal of buck circuit (102), filter (104) exports two ends and connects with other switched reluctance motor systems of wind energy turbine set.
2. switching magnetic-resistance wind-driven generator direct current output buck type electrical conversion systems according to claim 1, it is characterized in that, described buck circuit (102), is made up of the first capacitor (C1), the second capacitor (C2), the first resistance (R1), the second resistance (R2), electronic power switch (VT), Power Diode Pumped (VD), reactor (L), the 3rd resistance (R3); described first capacitor (C1) is connected with after described second capacitor (C2) series connection the both positive and negative polarity exported from switch reluctance generator and control system (101) thereof up and down respectively, described first resistance (R1) is connected with after described second resistance (R2) series connection the both positive and negative polarity exported from switch reluctance generator and control system (101) thereof up and down respectively, and the first resistance (R1) first capacitor (C1) relative to the second resistance (R2) and the second capacitor (C2) are away from the output of input and switch reluctance generator and control system (101) thereof, first capacitor (C1) is connected with the middle series connection point of the first resistance (R1) and the second resistance (R2) with the middle series connection point of the second capacitor (C2), described electronic power switch (VT) is series on positive polarity line, and directly connect the negative terminal of the first resistance (R1) and described Power Diode Pumped (VD) respectively, the anode of Power Diode Pumped (VD) connects on the second resistance (R2) and negative polarity line, described reactor (L) is series on positive polarity line, reactor (L) one end connects electronic power switch (VT) and Power Diode Pumped (VD) negative pole, the other end connects one end of described 3rd resistance (R3), the other end of the 3rd resistance (R3) exports as positive polarity, output negative pole is the negative polarity end of the input of this buck circuit (102).
3. switching magnetic-resistance wind-driven generator direct current output buck type electrical conversion systems according to claim 1, it is characterized in that, described electronic power switch (103) is normally closed switch, when switch reluctance generator and control system (101) thereof or buck circuit (102) break down, or when wind-force is too small or excessive needs stop generating electricity, electronic power switch (103) is disconnected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420778296.5U CN204258624U (en) | 2014-12-11 | 2014-12-11 | Switching magnetic-resistance wind-driven generator direct current output buck type electrical conversion systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420778296.5U CN204258624U (en) | 2014-12-11 | 2014-12-11 | Switching magnetic-resistance wind-driven generator direct current output buck type electrical conversion systems |
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| CN204258624U true CN204258624U (en) | 2015-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420778296.5U Expired - Fee Related CN204258624U (en) | 2014-12-11 | 2014-12-11 | Switching magnetic-resistance wind-driven generator direct current output buck type electrical conversion systems |
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| CN (1) | CN204258624U (en) |
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- 2014-12-11 CN CN201420778296.5U patent/CN204258624U/en not_active Expired - Fee Related
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150408 Termination date: 20171211 |
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| CF01 | Termination of patent right due to non-payment of annual fee |