CN208112245U - Electrical power transmission system, wind power generating set and wind power plant - Google Patents

Electrical power transmission system, wind power generating set and wind power plant Download PDF

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Publication number
CN208112245U
CN208112245U CN201820673618.8U CN201820673618U CN208112245U CN 208112245 U CN208112245 U CN 208112245U CN 201820673618 U CN201820673618 U CN 201820673618U CN 208112245 U CN208112245 U CN 208112245U
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module
pusher
wind
wind power
net
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李战龙
刘世军
杨有涛
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

The utility model discloses a kind of electrical power transmission system, wind power generating set and wind power plants, to carry out power transmission in the form of direct current, the cost and the line loss during power transmission for reducing transmission line of electricity, improve line efficiency, increase power transmission distance, while avoiding skin effect present in route.The electrical power transmission system, for electric energy caused by wind power generating set to be transferred to power grid, the electrical power transmission system includes:Pusher side rectification module, net side inverter module, grid-connected module and electricity-fetching module, wherein, for connecting wind power generating set, the pusher side rectification module, net side inverter module and grid-connected module are sequentially connected the pusher side rectification module, and the grid-connected module is for connecting power grid;The input terminal of the electricity-fetching module connects the net side inverter module, and output end is for connecting the wind power generating set.

Description

Electrical power transmission system, wind power generating set and wind power plant
Technical field
The utility model relates to power electronics field more particularly to a kind of electron-transport systems, wind power generating set And wind power plant.
Background technique
The needs of electric energy caused by wind power generating set are connected to the grid and are transmitted, will be caused by wind power generating set When electric energy is connected to the grid, traditional power transmission scheme is straight drive AC transmission system or double-fed AC transmission system.
As shown in Figure 1, showing the straight circuit topological structure for driving AC transmission system in Fig. 1.In wind power plant 10, each 690 volts of low-voltage AC is converted into 35 kilovolts after current transformer unsteady flow, through booster by electric energy caused by direct driving motor (KV) middle pressure alternating current, and bus rod 11 is pressed in remittance, the middle pressure alternating current of 35KV passes through liter in middle pressure bus rod 11 Depressor 12 is converted into the High Level AC Voltage of 110KV or the High Level AC Voltage of 220KV, finally by the High Level AC Voltage of 110KV or The High Level AC Voltage of person 220KV is connected to the grid 13.In this scheme, since there are reactive powers in AC network, to mention High transmitting capacity of the electric wire netting needs to install static reactive generator (Static Var Generator, SVG) 14 to carry out idle benefit It repays.
As shown in Fig. 2, showing the circuit topological structure of double-fed AC transmission system in Fig. 2.In wind power plant 20, each 690 volts of low-voltage AC is converted into 35KV's after current transformer unsteady flow, through booster by electric energy caused by double feedback electric engine Middle pressure alternating current, and bus rod 21 is pressed in remittance, the middle pressure alternating current of 35KV passes through booster 22 in middle pressure bus rod 21 The High Level AC Voltage of the High Level AC Voltage of 110KV perhaps 220KV is converted into finally by the High Level AC Voltage of 110KV or 220KV High Level AC Voltage be connected to the grid 23.It is defeated to improve power grid since there are reactive powers in AC network in this scheme Electric energy power, it is also desirable to install static reactive generator 24 to carry out reactive compensation.
From the foregoing, it will be observed that either directly drive AC transmission system or double-fed AC transmission system, by wind power plant apoplexy It when electric energy caused by power generator group is connected to the grid, is transmitted in a manner of alternating current.Such mode not only route Cost is high, less economical, transmission range is closer;And there is skin effect in the line in transmission in alternating current, and route utilizes Rate is low, loss is high;In addition, the variation of wind speed will cause the fluctuation of network voltage when being transmitted in a manner of alternating current;Simultaneously It needs to increase SVG in circuit system and carries out reactive compensation, increase system cost and loss.
Utility model content
The utility model embodiment provides a kind of electrical power transmission system, wind power generating set and wind power plant, to use The form of direct current carries out power transmission, and the cost and the line loss during power transmission for reducing transmission line of electricity improve line Road utilization rate increases power transmission distance, while avoiding skin effect present in route.
In a first aspect, the utility model embodiment provides a kind of electrical power transmission system, for being produced wind power generating set Raw electric energy is transferred to power grid, and electrical power transmission system includes:Pusher side rectification module, net side inverter module, grid-connected module, Yi Jiqu Electric module, wherein pusher side rectification module is for connecting wind power generating set, pusher side rectification module, net side inverter module and simultaneously Net module is sequentially connected, and grid-connected module is for connecting power grid;
The input terminal of electricity-fetching module connects net side inverter module, and output end is for connecting wind power generating set.
In some embodiments of first aspect, electrical power transmission system further includes:Pusher side multiwinding transformer, pusher side mostly around The primary side winding of group transformer for connect with the generator of wind power generating set, two pair sides of pusher side multiwinding transformer around Group is connect with pusher side rectification module and electricity-fetching module respectively.
In some embodiments of first aspect, electricity-fetching module includes multiwinding transformer and multiple power cells, multiple Cascade of power units connection, and the three-phase alternating current port of each power cell respectively with a vice-side winding of multiwinding transformer Three-phase port be correspondingly connected with, the primary side winding of multiwinding transformer is connected with a vice-side winding of pusher side multiwinding transformer It connects, multiple power cells are connected between two DC bus, and DC bus is connected to pusher side rectification module and net side inversion mould Between block.
It include three-phase pulse width modulated (Pulse in each power cell in some embodiments of first aspect Width Modulation, PWM) current transformer includes three inverter bridge legs being connected in parallel in three-phase PWM current transformer, and three Three-phase port of the midpoint of inverter bridge leg respectively with a vice-side winding of multiwinding transformer is correspondingly connected with.
It further include being cut with what three-phase PWM current transformer was connected in parallel in power cell in some embodiments of first aspect Involve and unloads energy component.
In some embodiments of first aspect, copped wave and unload can component include:It is connected between the bus of power cell Half-bridge bridge arm and one end is connected to half-bridge bridge arm midpoint and the other end is unloaded with what the positive electrode bus of power cell was connected It can resistance.
In some embodiments of first aspect, pusher side rectification module includes three-phase rectifier, and three-phase rectifier includes six A rectifying bridge arm includes the diode of multiple series connections in each rectifying bridge arm, wherein include is more in each rectifying bridge arm The sum of reverse withstand voltage value of a diode, and DC bus voltage value difference be greater than predetermined voltage threshold, DC bus connection Between pusher side rectification module and net side inverter module.
In some embodiments of first aspect, electrical power transmission system further includes:Dc circuit breaker is connected to pusher side rectification Between module and net side inverter module, for carrying out short-circuit protection to electrical power transmission system;Or/also,
DC flat-wave reactor is connected between pusher side rectification module and net side inverter module, for rectifying mould to pusher side The direct current of block output is filtered.
In some embodiments of first aspect, grid-connected module, including sequentially connected soft start switch circuit, switching group Part and net side transformer.
In some embodiments of first aspect, net side inverter module includes modular multilevel (Modular Multilevel Converter, MMC) converter valve.
Second aspect, the utility model embodiment provide a kind of wind power generating set, and wind power generating set includes that this is practical Electrical power transmission system provided by new embodiment first aspect.
The third aspect, the utility model embodiment provide a kind of wind power plant, and wind power plant includes that multiple the utility model are implemented Wind power generating set provided by example second aspect;Alternatively,
Wind power plant includes multiple wind-driven generators, electricity provided by bus rod and the utility model embodiment first aspect Force transmission system, wherein
Bus rod is connected with each wind-driven generator;
Electrical power transmission system is connected with bus rod.
Electrical power transmission system, wind power generating set and wind power plant provided by the embodiment of the utility model, electrical power transmission system Including:Pusher side rectification module, net side inverter module, grid-connected module and electricity-fetching module, wherein pusher side rectification module is for connecting Wind power generating set is connect, pusher side rectification module, net side inverter module and grid-connected module are sequentially connected, and grid-connected module is for connecting Power grid;The input terminal of electricity-fetching module connects net side inverter module, and output end is for connecting wind power generating set.
Electrical power transmission system provided by the embodiment of the utility model is connected net side inverter module and power grid by grid-connected module It connects, electricity-fetching module is taken from net side inverter module electric to start wind power generating set, after wind power generating set starting, Electric energy caused by wind power generating set converts alternating current to direct current by pusher side rectification module, and in the form of direct current It is transferred to net side, direct current is converted to alternating current by net side inverter module, and then alternating current is connected to the grid by grid-connected module. Electric energy caused by wind power generating set is transferred to net side from pusher side with direct current form in the above process, and adopts in the prior art It carries out transmission with alternating current form to compare, the cost and the line loss during power transmission that can reduce transmission line of electricity mention Elevated track utilization rate increases power transmission distance, while avoiding skin effect present in route.
Detailed description of the invention
It may be better understood from the description with reference to the accompanying drawing to specific embodiment of the present utility model practical It is novel wherein, the same or similar appended drawing reference indicates the same or similar feature.
Fig. 1 is the structural schematic diagram for directly driving the circuit topology of AC transmission system in the prior art;
Fig. 2 is the structural schematic diagram of the circuit topology of double-fed AC transmission system in the prior art;
Fig. 3 is the structural schematic diagram of the circuit topology of electrical power transmission system provided by the embodiment of the utility model;For convenience Understand, further it is shown that wind-driven generator;
Fig. 4 is the structural representation of the circuit topology of electricity-fetching module in electrical power transmission system provided by the embodiment of the utility model Figure;
The structural schematic diagram of the circuit topology of power cell in Fig. 5 electricity-fetching module provided by the embodiment of the utility model;
Fig. 6 is the structure of the circuit topology of pusher side rectification module in electrical power transmission system provided by the embodiment of the utility model Schematic diagram;
Fig. 7 is the structural schematic diagram of the circuit topology of wind power plant provided by the embodiment of the utility model.
Specific embodiment
The feature and exemplary embodiment of the various aspects of the utility model is described more fully below.It is retouched in detail in following In stating, many details are proposed, in order to provide the comprehensive understanding to the utility model.But for those skilled in the art It will be apparent that the utility model can be implemented in the case where not needing some details in these details for member. Below the description of embodiment is used for the purpose of providing by showing the example of the utility model to the more preferable of the utility model Understanding.The utility model is never limited to any concrete configuration and algorithm set forth below, but practical new not departing from this Any modification, replacement and the improvement of element, component and algorithm are covered under the premise of the spirit of type.In attached drawing and following description In, well known structure and technology is not shown, it is unnecessary fuzzy to avoid causing the utility model.
It should be noted that the pusher side being previously mentioned in the utility model embodiment refers to wind power generating set side, for example, this The pusher side rectification module being previously mentioned in utility model embodiment refers to the rectification module that wind power generating set side is arranged in.This is practical The net side being previously mentioned in new embodiment refers to grid side, for example, the net side inversion mould being previously mentioned in the utility model embodiment Block refers to the inverter module that grid side is arranged in.
Below with reference to Fig. 3~Fig. 7 to electrical power transmission system provided by the embodiment of the utility model, wind power generating set and wind Electric field is described in detail.
As shown in figure 3, electrical power transmission system provided by the embodiment of the utility model, is used for wind-force in wind power generating set Electric energy caused by generator 30 is transmitted to power grid 31, and electrical power transmission system includes:Pusher side rectification module 32, net side inverter module 33, grid-connected module 34 and electricity-fetching module 35, wherein pusher side rectification module 32 is for connecting wind power generating set, pusher side rectification Module 32, net side inverter module 33 and grid-connected module 34 are sequentially connected, and grid-connected module 34 is for connecting power grid;Electricity-fetching module 35 Input terminal connect net side inverter module 33, output end is for connecting wind power generating set.
Wherein, electricity-fetching module 35 take electricity to start the wind-driven generator in wind power generating set from net side inverter module 33 30, electric energy caused by wind-driven generator 30 is through pusher side rectification module 32, net side inverter module 33 and simultaneously in wind power generating set Net module 34 is transmitted to power grid 31.
When it is implemented, pusher side rectification module 32 and electricity-fetching module 35 can pass through multiwinding transformer and wind-driven generator The wind-driven generator 30 of group connects.Specifically, electrical power transmission system further includes:Pusher side multiwinding transformer 36, pusher side mostly around The primary side winding of group transformer 36 is used to connect with the wind-driven generator 30 of wind power generating set, pusher side multiwinding transformer 36 Two vice-side windings are connect with pusher side rectification module 32 and electricity-fetching module 35 respectively.
In one embodiment, electrical power transmission system further includes:Dc circuit breaker 37 is connected to pusher side rectification module 32 Between net side inverter module 33, for carrying out short-circuit protection to electrical power transmission system.
In one embodiment, electrical power transmission system further includes:DC flat-wave reactor 38 is connected to pusher side rectification mould Between block 32 and net side inverter module 33, the direct current for exporting to pusher side rectification module 32 is filtered.
In one embodiment, net side inverter module 33 includes MMC converter valve.
In one embodiment, grid-connected module 34, including sequentially connected soft start switch circuit 341, switch block 342 and net side transformer 343.Wherein, switch block 342 can use medium voltage breaker.
In practical application, when starting wind power generating set, the switch block 342 being closed in grid-connected module 34, at this point, power grid 31 pass through 343 direction wind-driven generator group power transmission of net side transformer.
Specifically, since switch block 342 is closed, net side inverter module 33 is connect with power grid 31, the friendship in power grid 31 Galvanic electricity by the soft charging resistor opened in switching circuit 341 to the busbar charging of net side inverter module 33 (or MMC converter valve), When charging is complete, the switch block in soft start switch circuit 341 is attracted, and disconnects the electricity that charges in soft start switch circuit 341 The AC charging circuit of resistance.
The electric energy stored in 33 bus of net side inverter module passes through DC flat-wave reactor 38 and dc circuit breaker 37, Xiang Zhi It flows bus and conveys direct current, wherein DC bus refers to the connecting line between pusher side rectification module 32 and net side inverter module 33.
Electricity-fetching module 35 takes electricity from DC bus, and the electric energy that will acquire is reverse into alternating current, is become by pusher side Multiple coil Depressor 36 takes electric winding, 30 power transmission of wind-driven generator in direction wind-driven generator group, meets wind-driven generator 30 and starts work Demand, start wind power generating set in wind-driven generator 30.
After wind-driven generator 30 in wind power generating set starts work, the exchange of 690V caused by wind-driven generator 30 Electricity, the boosted alternating current for being converted to 35KV, the alternating current for the 35KV that wind-driven generator 30 generates pass through pusher side Multiple coil transformation The alternating current of 35KV is supplied to pusher side rectification module 32 by the power winding of device 36.
The alternating current of 35KV is converted to direct current by pusher side rectification module 32, and passes sequentially through dc circuit breaker 37, direct current Smoothing reactor 38 is by DC power transmission to net side inverter module 33.Net side inverter module 33 is by DC inverter at the friendship of 35KV Galvanic electricity, and the alternating current of 35KV is converted to by net side transformer 343 alternating current of 220KV, it is then incorporated into power grid 31, is realized Electric energy caused by wind-driven generator 30 in wind power generating set is transmitted to power grid 31.
During wind-driven generator 30 in above-mentioned starting wind power generating set, electricity-fetching module 35 is needed from direct current mother Line takes electricity, and the electric energy that will acquire is reverse into alternating current, passes through the electric winding that takes of pusher side multiwinding transformer 36, wind power generation 30 power transmission of wind-driven generator in unit.
In one embodiment, as shown in figure 4, the circuit topological structure of electricity-fetching module 35, may include:Multiple coil becomes Depressor 351 and multiple power cells 352.Wherein, multiple 352 cascade connections of power cell, and the three-phase of each power cell 352 Three-phase port of the AC port respectively with a vice-side winding of multiwinding transformer 351 is correspondingly connected with, multiwinding transformer 351 Primary side winding be connected with a vice-side winding of pusher side multiwinding transformer 36, multiple power cells 352 are connected to two Between DC bus.
In one example, multiple power cells include M power cell, and each power cell 352 includes three electrical Port, respectively direct-flow positive pole port, direct current cathode port and three-phase alternating current port.In the multiple power cells of cascade connection When 352, the direct-flow positive pole port of first power cell 352 connects DC bus DC+, the direct current of first power cell 352 Cathode port connects the direct-flow positive pole port of second power cell 352;And so on, the direct current of m-th power cell 352 Positive port, connects the direct current cathode port of the M-1 power cell 352, and the direct current negative terminal mouth of m-th power cell 352 connects Meet DC bus DC-.
The three-phase alternating current port of first power cell 352 respectively with multiwinding transformer 351 it is secondary while first it is secondary while around The three-phase port of group is correspondingly connected with;Successively, the three-phase alternating current port of m-th power cell 352 respectively with multiwinding transformer The three-phase port of the m-th vice-side winding on 351 secondary sides is correspondingly connected with;The primary side winding of multiwinding transformer 351, connection pusher side are more One vice-side winding of winding transformer 36.Wherein, M is the positive integer greater than 1.
In one embodiment, as shown in figure 5, the circuit topological structure of power cell 352, may include:Three-phase arteries and veins Width modulated PWM converter 3520 is rushed, includes three inverter bridge legs being connected in parallel in three-phase PWM current transformer 3520, three inverse Become three-phase alternating current port of the midpoint as power cell 352 of bridge arm, respectively with a vice-side winding of multiwinding transformer Three-phase port is correspondingly connected with.
The three-phase PWM current transformer 3520 for including in power cell 352, can be the direct current in 352 bus of power cell It is reverse into three-phase alternating current, is mapped with the three-phase port of corresponding 351 vice-side winding of multiwinding transformer, it can also be more Three-phase alternating current in 351 vice-side winding of winding transformer is rectified into direct current, realizes the two-way flow of energy.
It in one embodiment, further include the copped wave being connected in parallel with three-phase PWM current transformer 3520 in power cell 352 And unload energy component 3521.As shown in figure 5, copped wave and unload can component 3521 include:It is connected between the bus of power cell 352 Half-bridge bridge arm and one end are connected to half-bridge bridge arm midpoint and the other end is unloaded with what the positive electrode bus of power cell 352 was connected It can resistance.
Energy and clipper component 3521 are unloaded, can be configured as in DC bus-bar voltage is more than preset DC bus-bar voltage threshold When value, by unload can and clipper component 3521 in unload can resistance, discharge the energy more than DC bus-bar voltage threshold value.Wherein, Preset DC bus-bar voltage threshold value can freely be set based on experience value.
It should be noted that the half-bridge bridge arm being previously mentioned in the utility model embodiment includes the insulation of two series connections Grid bipolar junction transistor (Insulated Gate Bipolar Transistor, IGBT).
In one embodiment, each IGBT that half-bridge bridge arm includes can also be connected with anti-paralleled diode.
It in one embodiment, further include the bus being connected in parallel with three-phase PWM current transformer 3520 in power cell 352 Capacitor 3522 and discharge resistance 3523.Wherein, bus capacitor 3522 is for realizing the storage of energy, and discharge resistance 3523 is for real Residual electricity energy releases after existing wind power generating set is shut down.
When electric energy caused by wind-driven generator 30 in wind power generating set is transferred to power grid 31, pusher side rectification module 32 for being converted to direct current for the alternating current of 35KV.Pusher side rectification module 32 may include three-phase rectifier.
As shown in fig. 6, three-phase rectifier includes six rectifying bridge arms 321, it include that multiple series connection connect in each rectifying bridge arm The diode connect, wherein the sum of the reverse withstand voltage value of multiple diodes for including in each rectifying bridge arm, the electricity with DC bus The difference of pressure value is greater than predetermined voltage threshold.Wherein, predetermined voltage threshold can freely be set based on experience value, for example, default electricity Pressure threshold value is 4500V.
Conceived based on identical utility model, the utility model embodiment additionally provides a kind of wind power generating set, wind-force It include electrical power transmission system provided by the utility model above-described embodiment in generating set.
Wind power generating set provided by the embodiment of the utility model, due to including that the utility model is real in wind power generating set The electrical power transmission system that example offer is provided, enable in wind power generating set electric energy caused by generator with direct current form from Pusher side is transferred to net side, so that the cost and the line loss during power transmission that reduce transmission line of electricity, improve route and utilize Rate increases power transmission distance, while avoiding skin effect present in route.
Conceived based on identical utility model, the utility model embodiment additionally provides a kind of wind power plant, and wind power plant includes Wind power generating set provided by multiple the utility model above-described embodiments.
It include that the utility model is implemented in wind power plant provided by the embodiment of the utility model, in each wind power generating set Electrical power transmission system provided by example, so that electric energy caused by each wind power generating set can be with direct current in wind power plant Form is transferred to net side from pusher side, so that the cost and the line loss during power transmission that reduce transmission line of electricity, improve line Road utilization rate increases power transmission distance, while avoiding skin effect present in route.
In addition, the utility model embodiment additionally provides another wind power plant, as shown in fig. 7, wind power plant includes multiple wind Power transmission system provided by generation array 39, bus rod 40 and the utility model above-described embodiment that power generator forms System 300, wherein bus rod 40 is connected with each wind-driven generator;Electrical power transmission system 300 is connected with bus rod 40 It connects.
Wherein, wind-driven generator can be the straight wind-driven generator for driving AC system, be also possible to the wind-force of double-fed AC system Generator, the utility model embodiment do not limit this.
In wind power plant provided by the embodiment of the utility model, mentioned in wind power plant using the utility model above-described embodiment The electrical power transmission system of confession, so that electric energy caused by each wind-driven generator can be with direct current form slave in wind power plant Side is transferred to net side, so that the cost and the line loss during power transmission that reduce transmission line of electricity, improve line efficiency, Increase power transmission distance, while avoiding skin effect present in route.Meanwhile it being converged in wind power plant using bus rod Electric energy caused by multiple wind-driven generators carries out concentration of transmissions, effectively save cost after convergence.
Those skilled in the art will be understood that above-described embodiment is illustrative and not restrictive.In different embodiments The different technologies feature of middle appearance can be combined, to obtain beneficial effect.Those skilled in the art are in research attached drawing, explanation On the basis of book and claims, the embodiment of other variations of revealed embodiment is will be understood that and realized.In right In claim, term " comprising " is not precluded from other devices or steps;Indefinite article "one" be not excluded for it is multiple;Term " the One ", " second " is for indicating title not for any specific sequence of expression.Any appended drawing reference in claim is not It should be understood limiting of its scope.The function of the multiple portions occurred in claim can be by an individual hardware Or software module is realized.Certain technical characteristic appearance are not meant in different dependent claims cannot be by these skills Art feature is combined to obtain beneficial effect.

Claims (11)

1. a kind of electrical power transmission system, for electric energy caused by wind power generating set to be transferred to power grid, which is characterized in that institute Stating electrical power transmission system includes:Pusher side rectification module, net side inverter module, grid-connected module and electricity-fetching module, wherein described Pusher side rectification module for connecting wind power generating set, the pusher side rectification module, net side inverter module and grid-connected module according to Secondary connection, the grid-connected module is for connecting power grid;
The electricity-fetching module, for taking electricity to start the wind power generating set from the net side inverter module.
2. system according to claim 1, which is characterized in that the electrical power transmission system further includes:Pusher side Multiple coil becomes Depressor, the primary side winding of the pusher side multiwinding transformer with the generator of the wind power generating set for connecting, the machine Two vice-side windings of side multiwinding transformer are connect with the pusher side rectification module and the electricity-fetching module respectively.
3. system according to claim 1, which is characterized in that the electricity-fetching module includes multiwinding transformer and multiple function Rate unit, the connection of the multiple cascade of power units, and the three-phase alternating current port of each power cell respectively with the Multiple coil The three-phase port of one vice-side winding of transformer is correspondingly connected with, and the primary side winding of the multiwinding transformer and the pusher side are more One vice-side winding of winding transformer is connected, and the multiple power cell is connected between two DC bus, described straight Stream bus is connected between the pusher side rectification module and the net side inverter module.
4. system according to claim 3, which is characterized in that include three-phase pulse width modulated in each power cell PWM converter, includes three inverter bridge legs being connected in parallel in the three-phase PWM current transformer, and three inverter bridge legs Three-phase port of the midpoint respectively with a vice-side winding of the multiwinding transformer is correspondingly connected with.
5. system according to claim 4, which is characterized in that further include becoming in the power cell with the three-phase PWM The copped wave and unload energy component that stream device is connected in parallel.
6. system according to claim 5, which is characterized in that the copped wave and unload can component include:It is connected to the function Half-bridge bridge arm and one end between the bus of rate unit are connected to half-bridge bridge arm midpoint and the other end and the power What the positive electrode bus of unit was connected unloads energy resistance.
7. system according to claim 1 to 6, which is characterized in that the pusher side rectification module includes that three-phase is whole Device is flowed, it includes the diode of multiple series connections in each rectifying bridge arm that the three-phase rectifier, which includes six rectifying bridge arms, In, the sum of the reverse withstand voltage value of multiple diodes for including in each rectifying bridge arm, and the difference of voltage value of DC bus are greater than Predetermined voltage threshold, the DC bus are connected between the pusher side rectification module and the net side inverter module.
8. system according to claim 1 to 6, which is characterized in that the electrical power transmission system further includes:Directly Breaker is flowed, is connected between the pusher side rectification module and the net side inverter module, for the electrical power transmission system Carry out short-circuit protection;Or/also,
DC flat-wave reactor is connected between the pusher side rectification module and the net side inverter module, for the machine The direct current of side rectification module output is filtered.
9. system according to claim 1 to 6, which is characterized in that the net side inverter module includes modularization More level MMC converter valves.
10. a kind of wind power generating set, which is characterized in that the wind power generating set includes such as any one of claim 1-9 The electrical power transmission system.
11. a kind of wind power plant, which is characterized in that the wind power plant includes multiple wind-driven generators as claimed in claim 10 Group;Alternatively,
The wind power plant includes that multiple wind-driven generators, bus rod and electric power as claimed in any one of claims 1-9 wherein pass Defeated system, wherein
The bus rod is connected with each wind-driven generator;
The electrical power transmission system is connected with the bus rod.
CN201820673618.8U 2018-05-07 2018-05-07 Electrical power transmission system, wind power generating set and wind power plant Active CN208112245U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110350506A (en) * 2019-07-23 2019-10-18 上海交通大学 Direct current Wind turbines, middle straightening stream direct grid-connected system and Control and protection system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110350506A (en) * 2019-07-23 2019-10-18 上海交通大学 Direct current Wind turbines, middle straightening stream direct grid-connected system and Control and protection system
CN110350506B (en) * 2019-07-23 2020-11-20 上海交通大学 Direct-current wind turbine generator, medium-voltage direct-current direct grid-connected system and control and protection system

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