CN107947222A - Direct current fan power transmission system - Google Patents
Direct current fan power transmission system Download PDFInfo
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- CN107947222A CN107947222A CN201711431306.2A CN201711431306A CN107947222A CN 107947222 A CN107947222 A CN 107947222A CN 201711431306 A CN201711431306 A CN 201711431306A CN 107947222 A CN107947222 A CN 107947222A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 49
- 238000004804 winding Methods 0.000 claims abstract description 13
- 238000004146 energy storage Methods 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000005611 electricity Effects 0.000 description 15
- 238000010586 diagram Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H02J3/386—
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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
- 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]
Abstract
The invention provides a direct current fan power transmission system which comprises a plurality of groups of direct current fans and direct current power transmission buses connected with the output ends of the direct current fans; each group of direct current fans comprises a wind turbine, a multi-winding direct drive motor, a converter, a single-phase transformer and a single-phase rectifier which are sequentially connected in series, and the output end of the single-phase rectifier is connected with the direct current transmission bus. According to the direct current fan power transmission system, direct current power transmission is performed in a mode that a plurality of multi-winding direct drive motors are connected in parallel, the problem of power grid voltage fluctuation caused by wind speed change is solved, the manufacturing cost of a power transmission line is reduced, and the power transmission distance is increased; meanwhile, the generator and the converter can be arranged in the cabin, and a small amount of medium-voltage cables are transmitted to the rectifier at the bottom of the tower through the high tower barrel, so that the cable releasing pressure of the fan system is greatly reduced.
Description
Technical field
The present invention relates to wind-powered electricity generation technical field of electric power transmission, more particularly to a kind of DC fan transmission system.
Background technology
Traditional low-pressure direct drives AC blower fan ac transmission topology as shown in Fig. 1 and Fig. 2, by N group low-voltage alternating-current wind turbines, in
35KV confluence ac bus is pressed to form.Wherein, low-voltage alternating-current blower interior is by wind energy conversion system, direct driving motor, low pressure current transformer and liter
Pressure transformer forms.Electricity of the low pressure current transformer by the step-up transformer with a matched with blower 690V low-voltage and high-currents
Can, the middle pressure alternating voltage for being converted into 35KV high voltage grades is transmitted to three-phase alternating current busbar.
However, in practical application, using three-phase alternating current transmission of electricity, there are following defect：
(1) voltage of current transformer output is relatively low, and electric current is larger, it is necessary to using substantial amounts of noble metal low-voltage cable, causes whole
The loss of machine system is larger；
(2) generator is in the cabin of tower top, and generally in the tower of bottom of towe, substantial amounts of low-voltage cable needs to pass through current transformer
High tower, is transferred to the current transformer of bottom of towe, and very big pressure is caused to untying the mooring rope for blower fan system；
(3) increasing with fan capacity, the capacity of current transformer is increasing, and low pressure current transformer needs to pass through parallel connection
Expand capacity, cause the technical problem such as stream and circulation, the reliability of blower fan system is impacted.
(4) transmission line of electricity is transmitted electricity for three-phase cable, and transmission line of electricity cost is high, and transmission distance is near, and easily due to wind speed
Change can cause the fluctuation of network voltage.
The content of the invention
The purpose of the present invention aims to provide a kind of DC fan transmission system, by what is changed positioned at the direct driving motor of tower top
Three-phase alternating current is converted into direct current and transmits electricity, to reduce the pressure of untying the mooring rope of blower fan system, reduce system loss and cost.
To achieve these goals, the present invention provides following technical scheme：
A kind of DC fan transmission system, including multigroup DC fan and be connected with DC fan output terminal described in every group
Direct current transportation busbar；It is wind energy conversion system that DC fan described in every group includes being sequentially connected in series, Multiple coil direct driving motor, current transformer, single-phase
Transformer, single-phase rectifier, wherein, the three-phase alternating current that the current transformer is used to be exported the Multiple coil direct driving motor turns
Single-phase alternating current is changed to export to the primary side of the single-phase transformer；The output terminal of single-phase rectifier in the DC fan with
The direct current transportation busbar is connected.
Preferably, the rotor of the Multiple coil direct driving motor and wind energy conversion system are coaxially connected, and stator is equipped with 3N winding, and every three
A winding forms one group of three-phase alternating current system, wherein N >=3.
Preferably, the current transformer is made of multiple AC/DC/AC circuits cascaded successively；Wherein, each AC/DC/AC electricity
The input terminal on road is connected with one group of three-phase windings of the Multiple coil direct driving motor, and each AC/DC/AC circuits have two outputs
Terminal, the second lead-out terminal of AC/DC/AC circuits described in upper level connect with the first lead-out terminal of next stage AC/DC/AC circuits
Connect, and the second lead-out terminal of the first lead-out terminal of first order AC/DC/AC circuits and afterbody AC/DC/AC circuits is one by one
Correspondence is connected with two input terminals of the single-phase transformer primary side.
Preferably, the AC/DC/AC circuits include be sequentially connected in series Three-Phase PWM Rectifier, DC capacitor, discharge resistance,
Chopper and H bridge inverters, wherein, the first lead-out terminal of the AC/DC/AC circuits and the second lead-out terminal are respectively described
Two lead-out terminals of H bridge inverters.
Preferably, the AC/DC/AC circuits further include bleeder resistance；The chopper includes two work(being serially connected
Rate device；One end of the bleeder resistance is connected to the transmission line between two power devices, and the other end is connected to described
On positive bus-bar in AC/DC/AC circuits.
Preferably, AC/DC/AC circuits the being integrated power cell.
Preferably, the single-phase rectifier is the H bridge structures with four bridge arms, each bridge arm be equipped with MMC modules and
One energy storage inductor, two bridge arms of distribution symmetrical above and below are connected and are electrically connected via the energy storage inductor, each MMC moulds
Block is connected via the energy storage inductor with a port of the single-phase transformer secondary, two outputs of the single-phase rectifier
Terminal connects one to one with two direct current transportation busbares.
Preferably, the MMC modules are made of the submodule of multiple cascades, the Second terminal of submodule described in upper level with
The first terminal connection of submodule described in next stage, wherein, the first terminal of first order submodule is electrically connected with the energy storage inductor
Connect, the Second terminal of afterbody submodule is connected with direct current transportation busbar.
Further, the MMC modules further include multiple bypasses to connect one to one with the multiple submodule
Switch, for when the corresponding submodule breaks down, by-pass switch action, circuit to be switched to where by-pass switch
Circuit, to ensure the normal work of MMC modules.
Preferably, the submodule include by two series connection the half-bridge circuit that forms of power devices and be connected across described half
The DC support capacitance of the busbar of bridge circuit.
Compared with prior art, the solution of the present invention has the following advantages：
1. the DC fan transmission system of the present invention is made of multigroup DC fan in parallel and direct current transportation busbar, its
In, the low frequency three-phase alternating current that Multiple coil direct driving motor is converted is converted into single-phase alternating current, then through single-phase change through current transformer
Depressor boosting, single-phase rectifier rectification and backward direct current transportation busbar confluence of boosting, being realized by multigroup DC fan will
The low-voltage AC that wind energy conversion system produces is converted to piezoelectricity in direct current and is transported in conveying busbar, avoids DC fan using series connection
Any group of wind turbine easily occurred during structure causes the voltage failure problem of transmission of electricity busbar when breaking down, solve to make during wind speed change
Into voltage ripple of power network problem, and reduce the cost of transmission line of electricity, lift transmission distance.
2. since the voltage of current transformer output is higher, electric current is smaller, it is only necessary to the few midium voltage cable of quantity so that complete machine
The loss of system reduces.
3. generator and current transformer all concentrate design in cabin, the few midium voltage cable of quantity passes through high tower, transmission
To the current transformer of bottom of towe, the pressure of untying the mooring rope of blower fan system is substantially reduced.
4. expanding capacity by raising voltage class, the technical problem such as stream and circulation is avoided, improves blower fan system
Reliability.
The additional aspect of the present invention and advantage will be set forth in part in the description, these will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
Of the invention above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments
Substantially and it is readily appreciated that, wherein：
Fig. 1 is the circuit diagram that existing low-pressure direct drives AC blower fan AC transmission system；
Fig. 2 is the structure diagram of AC blower fan in system shown in Figure 1；
Fig. 3 is the circuit diagram of the DC fan transmission system of the present invention；
Fig. 4 is the structure diagram of DC fan in DC fan transmission system shown in Fig. 3；
Fig. 5 is the structure diagram of the current transformer of one embodiment of the present invention；
Fig. 6 is the structure diagram of the single-phase rectifier of one embodiment of the present invention.
Embodiment
The embodiment of the present invention is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or has the function of same or like element.Below with reference to attached
The embodiment of figure description is exemplary, and is only used for explaining the present invention, and is not construed as limiting the claims.
As shown in Figures 3 to 6, the present invention provides a kind of DC fan transmission system, including multigroup DC fan 1 in parallel
With direct current transportation busbar 2, the electric current that multigroup DC fan 1 exports is flowed to the direct current transportation busbar 2.The direct current wind
Machine 1 is equipped with P groups, P >=2.It is defeated by two direct currents by the way that DC fan 1 is flowed to direct current transportation busbar 2 in parallel
Goddess of lightning's line 2 is transmitted electricity, and can reduce cost, the lifting transmission distance of transmission system.Simultaneously as the voltage of direct current transportation busbar 2 can
Control, can avoid the problem that the caused voltage ripple of power network when wind speed changes.
Referring to Fig. 4, it is preferable that the DC fan 1 include be sequentially connected in series wind energy conversion system 11, Multiple coil direct driving motor 12,
Current transformer 13, single-phase transformer 14 and single-phase rectifier 15.
Specifically, the Multiple coil direct driving motor 12 be preferably permanent magnet direct-drive wind-force generating machine, the rotor of generator with
Wind energy conversion system 11 is coaxially connected, and the stator of generator is equipped with 3N (N >=3) a winding, and every three windings form one group of ABC three-phase alternating current
System.Thus, can be by limiting the winding quantity of Multiple coil direct driving motor 12 come confinement voltage, and then can control to direct current transportation
The voltage that busbar 2 exports.
Incorporated by reference to Fig. 5, accordingly, the current transformer 13 is formed by N number of AC/DC/AC circuits cascadings, the AC/DC/AC electricity
Road being integrated power cell.Each AC/DC/AC circuits include Three-Phase PWM Rectifier 131, the busbar electricity being sequentially connected in series
Appearance, discharge resistance, chopper 132 and H bridge inverters 133.The input terminal of the Three-Phase PWM Rectifier 131 is the AC/
The input terminal of DC/AC circuits, is connected with one group of three-phase windings of the Multiple coil direct driving motor 12.Upper level AC/DC/AC circuits
H bridge inverters 133 the second lead-out terminal and next stage AC/DC/AC circuits H bridge inverters 133 first lead-out terminal
Connection, the first lead-out terminal of the H bridge inverters 133 of first order AC/DC/AC circuits and the H of afterbody AC/DC/AC circuits
Second lead-out terminal of bridge inverter 133 connects one to one onto two terminals of 14 primary side of single-phase transformer.So as to,
The three-phase alternating current that can be converted the Multiple coil direct driving motor 12 by current transformer 13 is rectified, inversion is single-phase to be converted into
Alternating current, reduces electric current, increases voltage.
Preferably, the chopper 132 includes two transistors connected and two correspond instead with the transistor
Fly-wheel diode in parallel.
Further, the AC/DC/AC circuits further include bleeder resistance, and one end of the bleeder resistance is connected to two
Transmission line between the transistor, the other end are connected on the positive bus-bar in the AC/DC/AC circuits.
In the DC fan transmission system of the present invention, the middle volage current transformer that is formed using multiple AC/DC/AC circuits cascadings
13, the voltage of output is high, and electric current is small, it is only necessary to which the few midium voltage cable of quantity, the loss of machine system are smaller.
Incorporated by reference to Fig. 6, it is preferable that the single-phase rectifier 15 is single-phase MMC (modular multi-level
Converter, modularization multi-level converter) rectifier, for by the AC rectification of 14 secondary of single-phase transformer and boosting
After converge into direct current transportation busbar 2.The single-phase rectifier 15 is set to the H bridge structures with four bridge arms, is set on each bridge arm
Have MMC modules 151 and an energy storage inductor 152, two bridge arms of distribution symmetrical above and below connect via the energy storage inductor 152 and
Be electrically connected, each MMC modules 151 via the energy storage inductor 152 and 14 secondary of single-phase transformer a port
Connection, two lead-out terminals and the two direct current transportation busbares 2 of the single-phase rectifier 15 connect one to one.
Wherein, tie of the energy storage inductor 152 as power transmission between voltage source commutation valve and AC system, determines
The power delivering capability of converter valve, the control of active power and reactive power, meanwhile, also have and suppress converter valve output current
With the switching frequency harmonic content in voltage, in short circuit, it may also suppress current-rising-rate and suppress peak value of short.
Wherein, the MMC modules 151 are made of the submodule 1511 of multiple cascades.The second end of the submodule 1511
Son is connected with the first terminal of next stage submodule 1511, wherein, the first terminal of first order submodule 1511 and the energy storage
Inductance 152 is electrically connected, and the Second terminal of afterbody submodule 1511 is connected with direct current transportation busbar 2.Wherein, the submodule
1511 quantity is set by technical staff according to the voltage class of direct current transportation busbar 2, whole submodules in MMC modules 151
The sum of 1511 magnitude of voltage is the voltage class of direct current transportation busbar 2.
Further, the MMC modules 151 further include multiple connects one to one with the multiple submodule 1511
By-pass switch, for when the submodule 1511 breaks down, circuit is switched to where the corresponding by-pass switch
Circuit, ensure MMC modules normal work, and then avoid due to submodule breaks down and cause busbar voltage occur therefore
Barrier.
Preferably, the submodule 1511 includes transistor, two and the transistor one-to-one corresponding by two series connection
The half-bridge circuit and be connected across the on high-tension side DC support capacitance of the half-bridge circuit that antiparallel fly-wheel diode is formed.
Preferably, above-mentioned transistor is insulated gate bipolar transistor.In other embodiments, the transistor may be used also
Replacing with other has the function of the power device of controllable switch.
When electric energy is transmitted from rectifier 15 to motor drive direction, single-phase medium pressure grade connection rectifier 15 becomes single-phase medium pressure grade connection
Inverter, is changed into alternating current by direct current energy, realizes the transmitted in both directions of electric energy.The rectifier 15 is expanded by the form of cascade
Capacity, avoids stream or the problems such as circulation, improves the reliability of wind turbine transmission system.
In the present invention, the access transmission system in parallel of DC fan 1, H bridge inverter of 2 voltage of direct current transportation busbar through cascade
Cascade, by single-phase transformer, again formed by corresponding single-phase MMC rectifier rectification cascade, even if one or more wind turbines
Break down, the failure of 2 voltage of direct current transportation busbar will not be caused, improve the stability of system.
The DC fan transmission system of the present invention, can all concentrate generator and current transformer 13 in cabin, by few
The midium voltage cable of amount is transferred to the single-phase rectifier 15 of bottom of towe by high cylinder tower, substantially reduces the pressure of untying the mooring rope of blower fan system.
In DC fan transmission system in the present invention, also limit voltage by controlling the quantity of generator windings, pass through current transformer
13rd, the problem of single-phase transformer 14 and rectifier 15 are to raise voltage class and then expansion capacity, avoid stream and circulation, carries
The reliability of blower fan system is risen.
To sum up, the present invention is changed using the low frequency ac that multigroup wind power generating set of parallel-connection structure produces wind energy conversion system
Be transported to for piezoelectricity in direct current in direct current transportation busbar, realize reduce power attenuation of the electric energy in course of conveying and transmission of electricity into
This, and avoid the problem that voltage failure occurs in caused transmission of electricity busbar during the cascaded structure using wind power generating set.
The above is only some embodiments of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of DC fan transmission system, it is characterised in that including multigroup DC fan and defeated with DC fan described in every group
The direct current transportation busbar of outlet connection；
DC fan described in every group includes wind energy conversion system, Multiple coil direct driving motor, current transformer, single-phase transformer, the list being sequentially connected in series
Commutating phase device, wherein,
The current transformer is used to the three-phase alternating current that the Multiple coil direct driving motor is exported being converted to single-phase alternating current to institute
State the primary side output of single-phase transformer；
The input terminal of the single-phase rectifier is connected with two ports of the single-phase transformer secondary, the output of single-phase rectifier
End is connected with the direct current transportation busbar.
2. DC fan transmission system according to claim 1, it is characterised in that the rotor of the Multiple coil direct driving motor
Coaxially connected with wind energy conversion system, stator is equipped with 3N winding, and every three windings form one group of three-phase alternating current system, wherein N >=3.
3. DC fan transmission system according to claim 1, it is characterised in that the current transformer is cascaded successively by multiple
AC/DC/AC circuits composition；Wherein,
The input terminal of each AC/DC/AC circuits is connected with one group of three-phase windings of the Multiple coil direct driving motor, each AC/DC/
AC circuits have two lead-out terminals, and the of the second lead-out terminal of the AC/DC/AC circuits and next stage AC/DC/AC circuits
One lead-out terminal connects, the first lead-out terminal of first order AC/DC/AC circuits and the second of afterbody AC/DC/AC circuits defeated
Go out terminal one-to-one corresponding to be connected with two input terminals of the single-phase transformer primary side.
4. DC fan transmission system according to claim 3, it is characterised in that the AC/DC/AC circuits are included successively
Three-Phase PWM Rectifier, bus capacitor, discharge resistance, chopper and the H bridge inverters of concatenation, wherein, the AC/DC/AC circuits
First lead-out terminal and the second lead-out terminal be respectively the H bridge inverters two lead-out terminals.
5. DC fan transmission system according to claim 4, it is characterised in that the AC/DC/AC circuits, which further include, to be let out
Electric discharge resistance；
The chopper includes two power devices being serially connected；
One end of the bleeder resistance is connected between two power devices, and the other end is connected to the AC/DC/AC circuits
In interior positive electrode bus.
6. the DC fan transmission system according to any one in claim 3 to 5, it is characterised in that the AC/DC/
AC circuit being integrated power cells.
7. DC fan transmission system according to claim 1, it is characterised in that the single-phase rectifier is with four
The H bridge structures of bridge arm, each bridge arm are equipped with MMC modules and energy storage inductor, and two bridge arms being distributed up and down are via the energy storage
Inductance is connected and is electrically connected, and each MMC modules are held via one of the energy storage inductor and the single-phase transformer secondary
Mouth connection, two lead-out terminals and the two direct current transportation busbares of the single-phase rectifier connect one to one.
8. DC fan transmission system according to claim 7, it is characterised in that the MMC modules are by multiple cascades
Submodule is formed, and the Second terminal of submodule is connected with the first terminal of next stage submodule described in upper level, wherein, the first order
The first terminal of submodule is electrically connected with the energy storage inductor, and Second terminal and the direct current transportation busbar of afterbody submodule connect
Connect.
9. DC fan transmission system according to claim 8, it is characterised in that the MMC modules further include it is multiple with
The by-pass switch that the multiple submodule connects one to one.
10. DC fan transmission system according to claim 8, it is characterised in that the submodule is included by two strings
Half-bridge circuit that the power device of connection is formed and be connected across the half-bridge circuit busbar DC support capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711431306.2A CN107947222A (en) | 2017-12-26 | 2017-12-26 | Direct current fan power transmission system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711431306.2A CN107947222A (en) | 2017-12-26 | 2017-12-26 | Direct current fan power transmission system |
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| CN107947222A true CN107947222A (en) | 2018-04-20 |
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| CN201711431306.2A Pending CN107947222A (en) | 2017-12-26 | 2017-12-26 | Direct current fan power transmission system |
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| CN108695842A (en) * | 2018-06-15 | 2018-10-23 | 西安交通大学 | A kind of photovoltaic system flexibility suitable for direct current distribution collects topology and its control method |
| CN109245145A (en) * | 2018-09-12 | 2019-01-18 | 南京鼎恩电子信息有限公司 | A kind of highway airfield equipment remote electric power system |
| CN113809768A (en) * | 2020-06-11 | 2021-12-17 | 新疆金风科技股份有限公司 | Direct-current wind generating set and direct-current wind power system |
| CN113949103A (en) * | 2021-11-24 | 2022-01-18 | 阳光电源股份有限公司 | Cascade type wind storage power generation system and control method thereof |
| CN116722576A (en) * | 2023-08-10 | 2023-09-08 | 长江三峡集团实业发展(北京)有限公司 | Offshore wind power direct current output topological circuit and system based on series-parallel converter valve |
| CN116722576B (en) * | 2023-08-10 | 2023-11-03 | 长江三峡集团实业发展(北京)有限公司 | Offshore wind power direct current output topological circuit and system based on series-parallel converter valve |
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