CN106786762A - A kind of hybrid grid-connected current conversion station for series direct current offshore wind farm - Google Patents
A kind of hybrid grid-connected current conversion station for series direct current offshore wind farm Download PDFInfo
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- CN106786762A CN106786762A CN201710016539.XA CN201710016539A CN106786762A CN 106786762 A CN106786762 A CN 106786762A CN 201710016539 A CN201710016539 A CN 201710016539A CN 106786762 A CN106786762 A CN 106786762A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 96
- 230000005684 electric field Effects 0.000 claims abstract description 26
- 239000004065 semiconductor Substances 0.000 claims description 17
- 230000002459 sustained effect Effects 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 claims description 9
- 210000004899 c-terminal region Anatomy 0.000 claims description 5
- 239000004020 conductor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 13
- 230000005611 electricity Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
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Classifications
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- H02J3/386—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/505—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/515—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The present invention relates to a kind of hybrid grid-connected current conversion station for series direct current marine wind electric field, belong to field of power conversion, described hybrid grid-connected current conversion station is used for the grid-connected of series direct current offshore wind farm, it is made up of voltage source converter (VSC) and line voltage commutation transverter (LCC), the DC side of wherein VSC and LCC is connected in series, and AC is connected in parallel.VSC is using the modularization multi-level converter based on half-bridge submodule, its DC voltage (UVSC) it is 0.5UDC, LCC is using the 12 thyristor converter devices pulsed, its AC voltage (ULCC) in 0.5UDCAnd 0.5UDCBetween continuously adjustabe, for controlling DC side electric current (Idc) size, the output voltage (U of current conversion stationdc) can be 0 to UDCBetween continuously adjustabe.When power network occurs Voltage Drop, VSC can provide reactive power for LCC, to reduce the probability that LCC occurs commutation failure.
Description
Technical field
The present invention relates to a kind of hybrid grid-connected current conversion station for series direct current offshore wind farm, belong to power converter technology
Field.
Background technology
Show according to the study, minable wind energy resources is 7.5 hundred million kilowatts, about the three of land wind-powered electricity generation times in China sea；
And offshore wind farm is close from coastal load center, there is no the problem of long-distance transmissions, it is easier to dissolve.Therefore, abundant sea
Upper wind energy resources adds the support energetically of the feasibility and national policy of current technology, under imply that marine wind electric field will turn into
One energy market for developing rapidly, and offshore wind power equipment will also welcome the growth of explosion type.At present, it is high to be built into
Originally, fault rate high and high maintenance cost are the important restriction factors of offshore wind farm development, but, with the hair of technology
Exhibition, and demonstration project is moved forward steadily, and the cost of offshore wind farm reducing year by year.
Due to the influence of cable capacity current, for remote offshore wind farm, direct current transportation is the transmission of electricity side of unique feasible
Formula, by the way of exchange collects direct current transmission, this mode needs to build expensive the remote offshore wind farm for putting into operation at present
Large marine platform, transformer and current transformer for placing high-voltage large-capacity, so as to cause construction cost high, maintenance work
Amount is big, and loss is big.
There is scholar to propose by the way of series direct current, the DC side of wind electric converter is connected in series, by wind-powered electricity generation unsteady flow
The middle pressure of device DC side, obtains high voltage after superposition, for direct current transmission, this mode is saved in the form of voltage is collected
The transformer and current transformer of high-voltage large-capacity, and the Large marine platform of these equipment is placed, therefore, significantly reduce and build
This is set as, maintenance workload is reduced, while also reducing loss.
At present collecting and transmission, the grid-connected change of current of its land for offshore wind farm is carried out by the way of series direct current
DC voltage of standing interior must be continuously adjusted on a large scale, for controlling the size of current in DC loop, choosing is available at present
The current transformer selected has two kinds, and a kind of is the line voltage commutation transverter based on IGCT, and this transverter needs line voltage
Auxiliary, carries out commutation, when the grid collapses, easily causes commutation failure, and then cause converter blocking；Another kind is base
In the modularization multi-level converter of full-bridge submodule, this transverter uses full-bridge submodule, and its DC voltage can be
Continuously adjusted between positive and negative rated value, but this transverter, as a result of full-bridge submodule, its cost is very high, loss
It is very big, due to series direct current offshore wind farm system and grid-connected current conversion station output negative voltage is not needed, therefore, based on full-bridge submodule
Modularization multi-level converter contain unnecessary redundancy, and these unnecessary redundancies can cause construction cost higher, loss
It is larger.
The content of the invention
The purpose of the present invention is to propose to a kind of hybrid grid-connected current conversion station for series direct current offshore wind farm, using voltage
Source transverter (hereinafter referred to as VSC) and line voltage commutation transverter (hereinafter referred to as LCC) are constituted, the DC voltage control of VSC
In 0.5UDC, and the DC voltage of LCC can be in -0.5UDCAnd 0.5UDCBetween continuously adjust grid-connected changed so that hybrid
The DC side output voltage for flowing station can be 0 to UDCBetween continuously adjust.
Hybrid grid-connected current conversion station for series direct current marine wind electric field proposed by the present invention, including positive pole current conversion station
Conv1 and negative pole current conversion station Conv2；The direct current negative pole end of positive pole current conversion station is connected with the direct-flow positive pole end of negative pole current conversion station, just
The direct-flow positive pole end of pole current conversion station as hybrid grid-connected current conversion station direct-flow positive pole end, the direct current negative pole end of negative pole current conversion station makees
It is the direct current negative pole end of hybrid grid-connected current conversion station；The exchange end AC of positive pole current conversion station exchanges end AC parallel connections with negative pole current conversion station
After connection in access power network.
The above-mentioned hybrid grid-connected current conversion station for series direct current marine wind electric field, wherein described positive pole current conversion station
Conv1 is identical with the structure of negative pole current conversion station Conv2, is made up of voltage source converter VSC and phase voltage commutation transverter LCC；
The direct current negative pole end of described voltage source converter VSC is connected with the direct-flow positive pole end of phase voltage commutation transverter LCC, voltage source
The direct-flow positive pole end of transverter VSC is used as positive pole current conversion station Conv1 or negative pole current conversion station Conv2 direct-flow positive poles end；Described phase
The direct current negative pole end of voltage commutation transverter LCC is used as positive pole current conversion station Conv1 or the direct current negative pole of negative pole current conversion station Conv2
End；The exchange end AC of voltage source converter VSC exchanges end AC and is connected in parallel with phase voltage commutation transverter LCC, is changed as positive pole
The exchange end of stream station Conv1 or negative pole current conversion station Conv2.
Voltage source converter VSC in above-mentioned positive pole current conversion station Conv1 and negative pole current conversion station Conv2 uses half-bridge module
Multilevel converter, is changed by the first converter arm, the second converter arm, the 3rd converter arm, the 4th converter arm, the 5th converter arm, the 6th
Stream arm, the first inductance L1, the second inductance L2, the 3rd inductance L3, the 4th inductance L4, the 5th inductance L56th inductance L6Constitute, it is described
The positive terminal of the first converter arm, the 3rd converter arm and the 5th converter arm be connected to each other, it is how electric as half-bridge moduleization
The direct-flow positive pole end of flat transverter, the negative pole end of the second converter arm, the 4th converter arm and the 6th converter arm is connected to each other,
As the direct current negative pole end of half-bridge module multilevel converter；The negative pole end of the first converter arm and the first inductance L1Upper end phase
Even；The negative pole end and the 3rd inductance L of the 3rd converter arm3Upper end be connected, the negative pole end and the 5th inductance L of the 5th converter arm5It is upper
End is connected, the positive terminal of the second converter arm and the second inductance L2Lower end be connected, the positive terminal and the 4th inductance L of the 4th converter arm4
Lower end be connected, the positive terminal and the 6th inductance L of the 6th converter arm6Lower end be connected, the first inductance L1Lower end and the second inductance
L2Upper end be connected, as the AC A ends of half-bridge module multilevel converter, the 3rd inductance L3Lower end and the 4th inductance
L4Upper end be connected, as the AC B ends of half-bridge module multilevel converter；5th inductance L5Lower end and the 6th inductance
L6Upper end be connected, as the AC C-terminal of half-bridge module multilevel converter.First converter arm therein, second change of current
The structure of arm, the 3rd converter arm, the 4th converter arm, the 5th converter arm and the 6th converter arm is identical, respectively comprising multiple power moulds
Block, forms a positive terminal and a negative pole end of converter arm after multiple power model series connection.The power model is semi-bridge type work(
Rate module, comprising the first DC capacitor C1, the 3rd semiconductor switch T3, the 4th semiconductor switch T4, the 3rd sustained diode 3
With the 4th sustained diode 4；The colelctor electrode of the 3rd described semiconductor switch T3, the negative pole of the 3rd sustained diode 3 and
The positive pole of the first DC capacitor C1 is connected with each other, the emitter stage of the 3rd semiconductor switch T3, the positive pole of the 3rd sustained diode 3,
The colelctor electrode of the 4th semiconductor switch T4 and the negative pole of the 4th sustained diode 4 are connected with each other, used as semi-bridge type power model
Positive terminal, the emitter stage of the 4th semiconductor switch T4, the positive pole of the 4th sustained diode 4 and the first DC capacitor C1's
Negative pole is connected with each other, used as the negative pole end of semi-bridge type power model.
In the above-mentioned hybrid grid-connected current conversion station for series direct current marine wind electric field, described phase voltage commutation transverter
LCC, including the first thyristor converter device, the second thyristor converter device, the first transformer and the second transformer；Described first is brilliant
The direct-flow positive pole end of brake tube transverter as phase voltage commutation transverter direct-flow positive pole end；The second described thyristor converter device
Direct current negative pole end as phase voltage commutation transverter direct current negative pole end；The direct current negative pole end of the first thyristor converter device and
The direct-flow positive pole end of two thyristor converter devices is connected；The exchange end of the first thyristor converter device and the secondary phase of the first transformer
Even；The exchange end of the second thyristor converter device is connected with the secondary of the second transformer；The primary side of the first transformer and the second transformation
The primary side of device is connected in parallel, used as the exchange end AC of phase voltage commutation transverter.The first above-mentioned thyristor converter device and second
The structure of thyristor converter device is identical, by the first IGCT S1, the second IGCT S2, the 3rd IGCT S3, the 4th IGCT S4,
5th IGCT S5 and the 6th IGCT S6 is constituted；The positive pole of the first IGCT S1, the second IGCT S2 and the 3rd IGCT S3
End is connected with each other, used as the direct-flow positive pole end of thyristor converter device；4th IGCT S4, the 5th IGCT S5 and the 6th IGCT
The negative pole end of S6 is connected with each other, used as the direct current negative pole end of thyristor converter device；The negative pole end of the first IGCT S1 and the 4th crystalline substance
The positive terminal connection of brake tube S4, the A ends at end are exchanged as thyristor converter device；The negative pole end of the second IGCT S2 and the 5th brilliant lock
The positive terminal connection of pipe S5, the B ends at end are exchanged as thyristor converter device；The negative pole end and the 6th IGCT of the 3rd IGCT S3
The positive terminal connection of S6, the C-terminal at end is exchanged as thyristor converter device.
Hybrid grid-connected current conversion station for series direct current marine wind electric field proposed by the present invention, its advantage is as follows：
1st, the hybrid grid-connected current conversion station for series direct current marine wind electric field of the invention, changes as a result of phase voltage
Phase transverter (LCC), therefore hybrid grid-connected current conversion station disclosure satisfy that the requirement of continuous DC side continuously adjustabe on a large scale.
2nd, the hybrid grid-connected current conversion station for series direct current marine wind electric field of the invention, employs based on IGCT
Line voltage commutation transverter, and the technology maturation of the existing line voltage commutation transverter based on IGCT, reliability are high, cost
Low, loss is small, therefore ensure that the high reliability and low cost of the hybrid grid-connected current conversion station of the present invention.
3rd, in the hybrid grid-connected current conversion station for series direct current marine wind electric field of the invention, voltage source converter is employed
Device, in AC failure, can inject reactive power for power network, reduce the wind that line voltage commutation transverter occurs commutation failure
Danger, so as to improve the fault ride-through capacity of hybrid grid-connected current conversion station.
Brief description of the drawings
Fig. 1 is the arrangement schematic diagram of series direct current marine wind electric field of the present invention.
Fig. 2 be in the hybrid grid-connected current conversion station for series direct current marine wind electric field shown in Fig. 1 positive pole current conversion station and
The circuit theory diagrams of negative pole current conversion station.
Fig. 3 is the modular multilevel based on half-bridge submodule in positive pole current conversion station and negative pole current conversion station shown in Fig. 2
The circuit theory of voltage source converter.
Fig. 4 be the modular multilevel based on half-bridge submodule shown in Fig. 3 voltage source converter in converter arm electricity
Road schematic diagram.
Fig. 5 is the circuit theory diagrams of power model in converter arm shown in Fig. 4.
During Fig. 6 is the hybrid grid-connected current conversion station for series direct current marine wind electric field shown in Fig. 2, phase voltage commutation is changed
Flow the circuit theory diagrams of device.
During Fig. 7 is the voltage commutation transverter shown in Fig. 6, the electricity of the first thyristor converter device and the second thyristor converter device
Road schematic diagram.
Fig. 8 is the DC side electric current of the hybrid grid-connected current conversion station for series direct current marine wind electric field proposed by the present invention
Control principle drawing.
Specific embodiment
Hybrid grid-connected current conversion station for series direct current marine wind electric field proposed by the present invention, the series connection being directed to is straight
The arrangement of marine wind electric field is flowed as shown in figure 1, including many typhoon force generating systems (WECS), often typhoon force generating system (WECS)
DC side be connected in series, after the superposition of the DC voltage of all wind generator systems, high voltage is formed, by submarine cable
(1-1) is delivered the power on the bank, then accesses power network by hybrid grid-connected current conversion station (Conv1 and Conv2).
Circuit theory diagrams such as Fig. 1 institutes of the hybrid grid-connected current conversion station for series direct current marine wind electric field of the invention
Show, including positive pole current conversion station (Conv1) and negative pole current conversion station (Conv2)；The direct current negative pole end of positive pole current conversion station and the negative pole change of current
The direct-flow positive pole end stood is connected, and the direct-flow positive pole end of positive pole current conversion station is born as the direct-flow positive pole end of hybrid grid-connected current conversion station
The direct current negative pole end of pole current conversion station as hybrid grid-connected current conversion station direct current negative pole end；The exchange end (AC) of positive pole current conversion station with
Accessed after being connected in parallel in power network at the exchange end (AC) of negative pole current conversion station.
In the above-mentioned hybrid grid-connected current conversion station for series direct current marine wind electric field, positive pole current conversion station (Conv1) with it is negative
The structure of pole current conversion station (Conv2) is identical, and its circuit theory diagrams by voltage source converter (VSC) and phase voltage as shown in Fig. 2 changed
Phase transverter (LCC) is constituted；The direct current negative pole end of described voltage source converter (VSC) and phase voltage commutation transverter (LCC)
Direct-flow positive pole end be connected, the direct-flow positive pole end of voltage source converter (VSC) is used as positive pole current conversion station (Conv1) or the negative pole change of current
Stand the direct-flow positive pole end of (Conv2)；The direct current negative pole end of described phase voltage commutation transverter (LCC) is used as positive pole current conversion station
(Conv1) or negative pole current conversion station (Conv2) direct current negative pole end；The exchange end (AC) of voltage source converter (VSC) and phase voltage
The exchange end (AC) of commutation transverter (LCC) is connected in parallel, used as positive pole current conversion station (Conv1) or negative pole current conversion station (Conv2)
Exchange end.
Above-mentioned positive pole current conversion station (Conv1) uses half-bridge with the voltage source converter (VSC) in negative pole current conversion station (Conv2)
Modularization multi-level converter, the circuit theory diagrams of half-bridge module multilevel converter as shown in figure 3, by the first converter arm,
Second converter arm, the 3rd converter arm, the 4th converter arm, the 5th converter arm, the 6th converter arm, the first inductance (L1), the first inductance
(L1), the second inductance (L2), the 3rd inductance (L3), the 4th inductance (L4), the 5th inductance (L5) and the 6th inductance (L6) constitute, it is described
The positive terminal of the first converter arm, the 3rd converter arm and the 5th converter arm be connected to each other, it is how electric as half-bridge moduleization
The direct-flow positive pole end of flat transverter, the negative pole end of the second converter arm, the 4th converter arm and the 6th converter arm is connected to each other,
As the direct current negative pole end of half-bridge module multilevel converter；The negative pole end of the first converter arm and the first inductance (L1) upper end
It is connected；The negative pole end and the 3rd inductance (L of the 3rd converter arm3) upper end be connected, the negative pole end and the 5th inductance of the 5th converter arm
(L5) upper end be connected, the positive terminal of the second converter arm and the second inductance (L2) lower end be connected, the positive terminal of the 4th converter arm with
4th inductance (L4) lower end be connected, the positive terminal and the 6th inductance (L of the 6th converter arm6) lower end be connected, the first inductance (L1)
Lower end and the second inductance (L2) upper end be connected, as the AC A ends of half-bridge module multilevel converter, the 3rd inductance
(L3) lower end and the 4th inductance (L4) upper end be connected, as the AC B ends of half-bridge module multilevel converter；5th
Inductance (L5) lower end and the 6th inductance (L6) upper end be connected, as the AC C-terminal of half-bridge module multilevel converter.
The knot of the first converter arm therein, the second converter arm, the 3rd converter arm, the 4th converter arm, the 5th converter arm and the 6th converter arm
Structure is identical, and its circuit theory diagrams is as shown in figure 4, respectively comprising multiple power models, the change of current is formed after multiple power model series connection
One positive terminal and a negative pole end of arm.Power model in converter arm, its circuit theory diagrams are as shown in figure 5, be semi-bridge type
Power model, comprising the first DC capacitor C1, the 3rd semiconductor switch T3, the 4th semiconductor switch T4, the 3rd fly-wheel diode
D3 and the 4th sustained diode 4；The described colelctor electrode of the 3rd semiconductor switch T3, the negative pole of the 3rd sustained diode 3 with
And first DC capacitor C1 positive pole be connected with each other, emitter stage, the 3rd sustained diode 3 of the 3rd semiconductor switch T3 are just
The negative pole of pole, the colelctor electrode of the 4th semiconductor switch T4 and the 4th sustained diode 4 is connected with each other, used as semi-bridge type power
The positive terminal of module, the emitter stage of the 4th semiconductor switch T4, the positive pole and the first DC capacitor of the 4th sustained diode 4
The negative pole of C1 is connected with each other, used as the negative pole end of semi-bridge type power model.
In hybrid grid-connected current conversion station for series direct current marine wind electric field as shown in Figure 2 proposed by the present invention, phase
The circuit theory diagrams of voltage commutation transverter LCC including the first thyristor converter device (6-1), the second IGCT as shown in fig. 6, change
Stream device (6-2), the first transformer (6-3) and the second transformer (6-4)；The direct current of the first described thyristor converter device (6-1)
Positive terminal as phase voltage commutation transverter direct-flow positive pole end；The direct current negative pole of the second described thyristor converter device (6-2)
Hold as the direct current negative pole end of phase voltage commutation transverter；The direct current negative pole end of the first thyristor converter device (6-1) and the second crystalline substance
The direct-flow positive pole end of brake tube transverter (6-2) is connected；The exchange end of the first thyristor converter device (6-1) and the first transformer (6-
3) secondary is connected；The exchange end of the second thyristor converter device (6-2) is connected with the secondary of the second transformer (6-4)；First becomes
The primary side of depressor (6-3) is connected in parallel with the primary side of the second transformer (6-4), used as the exchange end of phase voltage commutation transverter
(AC).Wherein the first thyristor converter device (6-1) is identical with the structure of the second thyristor converter device (6-2), its circuit theory diagrams
As shown in fig. 7, by the first IGCT (S1), the second IGCT (S2), the 3rd IGCT (S3), the 4th IGCT (S4), the 5th
IGCT (S5) and the 6th IGCT (S6) are constituted；First IGCT (S1), the second IGCT (S2) and the 3rd IGCT (S3)
Positive terminal be connected with each other, as the direct-flow positive pole end of thyristor converter device；4th IGCT (S4), the 5th IGCT (S5) and
The negative pole end of the 6th IGCT (S6) is connected with each other, used as the direct current negative pole end of thyristor converter device；First IGCT (S1)
Negative pole end is connected with the positive terminal of the 4th IGCT (S4), and the A ends at end are exchanged as thyristor converter device；Second IGCT (S2)
Negative pole end be connected with the positive terminal of the 5th IGCT (S5), as thyristor converter device exchange end B ends；3rd IGCT
(S3) negative pole end is connected with the positive terminal of the 6th IGCT (S6), and the C-terminal at end is exchanged as thyristor converter device.
Below in conjunction with accompanying drawing 8, it is discussed in detail proposed by the present invention for the hybrid grid-connected of series direct current marine wind electric field
The operation principle of current conversion station：
The DC side load voltage value of positive pole current conversion station (Conv1) and negative pole current conversion station (Conv2) is UDC, voltage source converter
DC voltage (the U of device VSCVSC) control in 0.5UDC, the DC voltage (U of line voltage commutation transverter LCCLCC) can-
0.5UDCWith 0.5UDCBetween continuously adjust, the DC side output voltage (U of positive pole transverter groupdc) 0 to UDCBetween continuously adjust
Section.DC side electric current (the I of grid-connected current conversion stationdc) controlled by line voltage commutation transverter (LCC), DC side electric current (Idc) and electricity
Stream reference value (Idcref) by after comparing, adoption rate integral controller (PI) obtains the triggering of line voltage commutation transverter
Angle α, and then control the DC voltage (U of line voltage commutation transverterLCC)。
Claims (7)
1. a kind of hybrid grid-connected current conversion station for series direct current marine wind electric field, it is characterised in that：Including positive pole current conversion station
Conv1 and negative pole current conversion station Conv2；The direct current negative pole end of positive pole current conversion station is connected with the direct-flow positive pole end of negative pole current conversion station, just
The direct-flow positive pole end of pole current conversion station as hybrid grid-connected current conversion station direct-flow positive pole end, the direct current negative pole end of negative pole current conversion station makees
It is the direct current negative pole end of hybrid grid-connected current conversion station；The exchange end AC of positive pole current conversion station exchanges end AC parallel connections with negative pole current conversion station
After connection in access power network.
2. the hybrid grid-connected current conversion station of series direct current marine wind electric field is used for as claimed in claim 1, it is characterised in that its
Described in positive pole current conversion station Conv1 it is identical with the structure of negative pole current conversion station Conv2, by voltage source converter VSC and phase voltage
Commutation transverter LCC is constituted；The direct current negative pole end of described voltage source converter VSC is straight with phase voltage commutation transverter LCC's
Stream positive terminal is connected, and the direct-flow positive pole end of voltage source converter VSC is used as positive pole current conversion station Conv1 or negative pole current conversion station Conv2
Direct-flow positive pole end；The direct current negative pole end of described phase voltage commutation transverter LCC is used as positive pole current conversion station Conv1 or the negative pole change of current
Stand the direct current negative pole end of Conv2；The exchange end AC of voltage source converter VSC exchanges end AC simultaneously with phase voltage commutation transverter LCC
Connection connection, as positive pole current conversion station Conv1 or the exchange end of negative pole current conversion station Conv2.
3. the hybrid grid-connected current conversion station of series direct current marine wind electric field is used for as claimed in claim 2, it is characterised in that its
Described in voltage source converter VSC use half-bridge module multilevel converter, by the first converter arm, the second converter arm, the
Three converter arms, the 4th converter arm, the 5th converter arm, the 6th converter arm, the first inductance L1, the second inductance L2, the 3rd inductance L3,
Four inductance L4, the 5th inductance L56th inductance L6Constitute, described the first converter arm, the 3rd converter arm and the 5th converter arm are just
Extremely it is connected to each other, as the direct-flow positive pole end of half-bridge module multilevel converter, the second converter arm, the 4th change of current
The negative pole end of arm and the 6th converter arm is connected to each other, used as the direct current negative pole end of half-bridge module multilevel converter；
The negative pole end of the first converter arm and the first inductance L1Upper end be connected；The negative pole end and the 3rd inductance L of the 3rd converter arm3Upper end
It is connected, the negative pole end and the 5th inductance L of the 5th converter arm5Upper end be connected, the positive terminal of the second converter arm and the second inductance L2's
Lower end is connected, the positive terminal and the 4th inductance L of the 4th converter arm4Lower end be connected, the positive terminal of the 6th converter arm is electric with the 6th
Sense L6Lower end be connected, the first inductance L1Lower end and the second inductance L2Upper end be connected, as many level changes of current of half-bridge moduleization
The AC A ends of device, the 3rd inductance L3Lower end and the 4th inductance L4Upper end be connected, as many level changes of current of half-bridge moduleization
The AC B ends of device；5th inductance L5Lower end and the 6th inductance L6Upper end be connected, as many level changes of current of half-bridge moduleization
The AC C-terminal of device.
4. the hybrid grid-connected current conversion station of series direct current marine wind electric field is used for as claimed in claim 3, it is characterised in that its
Described in the first converter arm, the second converter arm, the 3rd converter arm, the 4th converter arm, the 5th converter arm and the 6th converter arm
Structure is identical, respectively comprising multiple power models, formed after the series connection of multiple power models converter arm a positive terminal and one
Negative pole end.
5. the hybrid grid-connected current conversion station of series direct current marine wind electric field is used for as claimed in claim 4, it is characterised in that its
Described in power model, be semi-bridge type power model, comprising the first DC capacitor C1, the 3rd semiconductor switch T3, the 4th half
Conductor switch T4, the 3rd sustained diode 3 and the 4th sustained diode 4；The colelctor electrode of the 3rd described semiconductor switch T3,
The positive pole of the negative pole of the 3rd sustained diode 3 and the first DC capacitor C1 is connected with each other, the transmitting of the 3rd semiconductor switch T3
Pole, the negative pole of the positive pole, the colelctor electrode of the 4th semiconductor switch T4 and the 4th sustained diode 4 of the 3rd sustained diode 3
It is connected with each other, as the positive terminal of semi-bridge type power model, the emitter stage of the 4th semiconductor switch T4, the 4th sustained diode 4
Positive pole and the first DC capacitor C1 negative pole be connected with each other, as the negative pole end of semi-bridge type power model.
6. the hybrid grid-connected current conversion station of series direct current marine wind electric field is used for as claimed in claim 2, it is characterised in that its
Described in phase voltage commutation transverter LCC, including the first thyristor converter device, the second thyristor converter device, the first transformer
With the second transformer；The direct-flow positive pole end of the first described thyristor converter device as phase voltage commutation transverter direct-flow positive pole
End；The direct current negative pole end of the second described thyristor converter device as phase voltage commutation transverter direct current negative pole end；First is brilliant
The direct current negative pole end of brake tube transverter is connected with the direct-flow positive pole end of the second thyristor converter device；The friendship of the first thyristor converter device
Stream end is connected with the secondary of the first transformer；The exchange end of the second thyristor converter device is connected with the secondary of the second transformer；The
The primary side of one transformer is connected in parallel with the primary side of the second transformer, used as the exchange end AC of phase voltage commutation transverter.
7. the hybrid grid-connected current conversion station of series direct current marine wind electric field is used for as claimed in claim 5, it is characterised in that its
Described in the first thyristor converter device it is identical with the structure of the second thyristor converter device, by the first IGCT S1, the second brilliant lock
Pipe S2, the 3rd IGCT S3, the 4th IGCT S4, the 5th IGCT S5 and the 6th IGCT S6 are constituted；First IGCT S1,
The positive terminal of two IGCT S2 and the 3rd IGCT S3 is connected with each other, used as the direct-flow positive pole end of thyristor converter device；4th is brilliant
Brake tube S4, the negative pole end of the 5th IGCT S5 and the 6th IGCT S6 are connected with each other, used as the direct current negative pole of thyristor converter device
End；The negative pole end of the first IGCT S1 is connected with the positive terminal of the 4th IGCT S4, and the A at end is exchanged as thyristor converter device
End；The negative pole end of the second IGCT S2 is connected with the positive terminal of the 5th IGCT S5, and the B at end is exchanged as thyristor converter device
End；The negative pole end of the 3rd IGCT S3 is connected with the positive terminal of the 6th IGCT S6, and the C at end is exchanged as thyristor converter device
End.
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| CN201710016539.XA CN106786762A (en) | 2017-01-10 | 2017-01-10 | A kind of hybrid grid-connected current conversion station for series direct current offshore wind farm |
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| CN201710016539.XA CN106786762A (en) | 2017-01-10 | 2017-01-10 | A kind of hybrid grid-connected current conversion station for series direct current offshore wind farm |
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