CN216959342U - Wind generating set and current conversion and energy storage combined system thereof - Google Patents
Wind generating set and current conversion and energy storage combined system thereof Download PDFInfo
- Publication number
- CN216959342U CN216959342U CN202123426984.4U CN202123426984U CN216959342U CN 216959342 U CN216959342 U CN 216959342U CN 202123426984 U CN202123426984 U CN 202123426984U CN 216959342 U CN216959342 U CN 216959342U
- Authority
- CN
- China
- Prior art keywords
- direct current
- side converter
- energy storage
- bus
- cable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004146 energy storage Methods 0.000 title claims abstract description 95
- 238000006243 chemical reaction Methods 0.000 title claims description 12
- 238000004804 winding Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 abstract description 15
- 230000009466 transformation Effects 0.000 abstract description 6
- 238000007599 discharging Methods 0.000 abstract description 3
- 239000003990 capacitor Substances 0.000 description 16
- 238000010586 diagram Methods 0.000 description 10
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 6
- 235000017491 Bambusa tulda Nutrition 0.000 description 6
- 241001330002 Bambuseae Species 0.000 description 6
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 6
- 239000011425 bamboo Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 3
- 230000002500 effect on skin Effects 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Landscapes
- Wind Motors (AREA)
Abstract
The application discloses wind generating set and current transformation and energy storage combined system thereof, this current transformation and energy storage combined system includes: the system comprises a machine side converter, a network side converter and a direct current energy storage unit; the machine side converter is positioned in a cabin of the wind generating set, the grid side converter is positioned in a tower bottom of the wind generating set, and the direct current energy storage unit is positioned in a tower barrel of the wind generating set; the machine side converter is connected with the network side converter through a direct current cable; the direct current energy storage unit is connected with a direct current cable. Therefore, the current transmitted in the tower barrel is converted into direct current through the machine side converter at the cabin and the net side converter at the tower bottom, the number of cables in the tower barrel is reduced, and the cost of the cables is reduced. The direct current energy storage unit can reduce current fluctuation on a direct current bus, improve the quality of electric energy output by the wind generating set, and does not affect the network side connection of the wind driven generator in the charging and discharging process of the direct current energy storage unit.
Description
Technical Field
The application relates to the field of wind power generation, in particular to a wind generating set and a current converting and energy storing combined system thereof.
Background
At present, a generator in a wind generating set is usually located in a nacelle at the top end of a tower, and three-phase current output by the generator is transmitted to a converter at the bottom of the tower through a three-phase cable inside the tower, and the converter modulates the three-phase current and incorporates the three-phase current into a power grid.
However, with the development of wind generating sets, the generated power of a single generator set is larger and larger, the blades of the wind generating sets are longer and longer, and the tower drum is higher and higher, which results in that the length of a three-phase cable in the tower drum is longer and longer. The length of the cable is lengthened, so that the equivalent resistance of the whole cable is increased, and the loss generated when three-phase current flows through the cable is improved. In order to reduce the equivalent resistance of the cables, a plurality of cables are usually connected in parallel, so as to reduce the electric energy lost when the current is transmitted through the tower, which causes the cost of the cables in the wind generating set to be high, and the excessive number of cables in the tower also causes the yaw of the nacelle system. In addition, the output current of the existing wind generating set has large fluctuation and the quality of electric energy is low.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the application provides a wind generating set and a current converting and energy storing combined system thereof, which are used for reducing the number of cables in a tower and improving the quality of electric energy output by the wind generating set.
In order to achieve the above purpose, the technical solutions provided in the embodiments of the present application are as follows:
the embodiment of the application provides a wind generating set's current transformation and energy storage combined system, current transformation and energy storage combined system includes: the system comprises a machine side converter, a network side converter and a direct current energy storage unit;
the machine side converter is positioned in a cabin of the wind generating set, the grid side converter is positioned in a tower bottom of the wind generating set, and the direct current energy storage unit is positioned in a tower barrel of the wind generating set;
the machine side converter is connected with the network side converter through a direct current cable; the direct current energy storage unit is connected with the direct current cable.
As a possible embodiment, the machine side converter comprises: a first machine-side converter and a second machine-side converter; the grid-side converter comprises a first grid-side converter and a second grid-side converter;
the first machine side converter is connected with a first winding of a generator of the wind generating set, and the second machine side converter is connected with a second winding of the generator of the wind generating set; the first machine-side converter is connected with the first grid-side converter; the second machine-side converter is connected with the second net-side converter.
As a possible embodiment, the dc cable includes a positive bus dc cable, a ground bus dc cable, and a negative bus dc cable;
the positive bus of the first machine-side converter is connected with the positive bus of the first grid-side converter through the positive bus direct-current cable;
the negative bus of the second machine side converter is connected with the negative bus of the second network side converter through the negative bus direct current cable;
a negative bus of the first machine side converter is connected with a positive bus of the second machine side converter to form a first zero grounding bus; and the negative bus of the first grid-side converter is connected with the positive bus of the second grid-side converter to form a second zero-grounding bus, and the first zero-grounding bus is connected with the second zero-grounding bus through a grounding bus cable.
As a possible implementation, the dc energy storage unit includes a first dc/dc power converter, a second dc/dc power converter, a first dc energy storage module, and a second dc energy storage module;
the positive input end of the first direct current/direct current power converter is connected with the positive bus direct current cable, and the negative input end of the first direct current/direct current power converter is connected with the grounding busbar cable; the output end of the first direct current/direct current power converter is connected with the first direct current energy storage module;
the positive input end of the second direct current/direct current power converter is connected with the grounding busbar cable, and the negative input end of the second direct current/direct current power converter is connected with the negative bus direct current cable; and the output end of the second direct current/direct current power converter is connected with the second direct current energy storage module.
As a possible implementation, the first dc energy storage module and the second dc energy storage module are both battery cluster modules.
As a possible implementation manner, the wind generating set includes a plurality of the direct current energy storage units, and the plurality of the direct current energy storage units are located at different height positions in a tower.
The embodiment of the application also provides a wind generating set, which comprises an engine room, a generator, a tower bottom and the wind generating set current-converting and energy-storing combined system.
As a possible embodiment, the generator is a double winding electrical machine.
As a possible implementation, the wind turbine generator set is a direct-drive wind turbine generator set.
As a possible implementation manner, the wind generating set is a semi-direct-drive wind generating set, the semi-direct-drive wind generating set further comprises a gear box, and the generator is connected with the machine-side converter through the gear box.
According to the technical scheme, the method has the following beneficial effects:
the embodiment of the application provides a wind generating set's current transformation and energy storage combined system, and current transformation and energy storage combined system includes: the system comprises a machine side converter, a network side converter and a direct current energy storage unit; the machine side converter is positioned in a cabin of the wind generating set, the grid side converter is positioned in a tower bottom of the wind generating set, and the direct current energy storage unit is positioned in a tower barrel of the wind generating set; the machine side converter is connected with the network side converter through a direct current cable; the direct current energy storage unit is connected with a direct current cable.
Therefore, the current transmitted in the tower barrel is converted into direct current through the machine side converter at the cabin and the net side converter at the tower bottom, the number of cables in the tower barrel is reduced, and the cost of the cables is reduced. Correspondingly, this application utilizes the surplus space in the direct current cable in the tower section of thick bamboo and the tower section of thick bamboo, has set up the direct current energy storage unit in the tower section of thick bamboo, and this direct current energy storage unit can reduce the electric current fluctuation on the direct current bus, improves the electric energy quality of wind generating set output, and because this direct current energy storage unit is located the machine side of net side converter, at the charge-discharge in-process of this direct current energy storage unit, does not connect the net side to produce the influence to wind driven generator.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following descriptions are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic view of a combined variable flow and energy storage system of a wind turbine generator system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a wind turbine generator system according to an embodiment of the present disclosure;
fig. 3 is a topological structure diagram of another combined variable flow and energy storage system of a wind turbine generator system according to an embodiment of the present application;
fig. 4 is a perspective structural view of a wind turbine generator system according to an embodiment of the present disclosure;
fig. 5 is a schematic circuit diagram of a first machine-side converter and a second machine-side converter in a combined conversion and energy storage system of a wind turbine generator system according to an embodiment of the present disclosure;
fig. 6 is a schematic circuit diagram of a first grid-side converter and a second grid-side converter in a combined conversion and energy storage system of a wind turbine generator system according to an embodiment of the present disclosure;
fig. 7 is a schematic circuit diagram of a direct current energy storage unit in a combined variable current and energy storage system of a wind turbine generator system according to an embodiment of the present application.
Detailed Description
In order to help better understand the scheme provided by the embodiment of the present application, before describing the method provided by the embodiment of the present application, a scenario of an application of the scheme of the embodiment of the present application is described.
With the development of the wind generating set, the length of the cable in the tower barrel is increased, so that the equivalent resistance of the whole cable is increased, and the loss generated when three-phase current flows through the cable is improved. In order to reduce the equivalent resistance of the cables, a plurality of cables are usually connected in parallel, so as to reduce the electric energy lost when the current is transmitted through the tower, which causes the cost of the cables in the wind generating set to be high, and the excessive number of cables in the tower also causes the yaw of the nacelle system. In addition, the output current of the existing wind generating set has large fluctuation and the quality of electric energy is low.
In order to solve the technical problem, an embodiment of the present application provides a converter and energy storage combined system of a wind turbine generator system, and on one hand, a dc cable in a tower can avoid a problem of low cable utilization rate caused by a skin effect of an ac cable, that is, when the dc cable is adopted to transmit current in the tower, the cable utilization rate is high, the number of cables in the tower is reduced, and the cost of the cable is reduced. On the other hand, the direct current energy storage unit connected with the direct current cable is arranged in the tower barrel of the wind generating set, the direct current energy storage unit can charge and discharge the direct current cable, fluctuation of the direct current cable is reduced, and electric energy quality output by the wind generating set is improved.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the drawings are described in detail below.
Referring to fig. 1, the drawing is a schematic view of a combined conversion and energy storage system of a wind turbine generator system according to an embodiment of the present application.
As shown in fig. 1, the combined converter and energy storage system of a wind turbine generator system provided in the embodiment of the present application includes: the system comprises a machine side converter 102, a direct current energy storage unit 201 and a grid side converter 301.
The machine-side converter 102 is located in the nacelle 100, the grid-side converter 301 is located in the tower bottom 300, and the direct-current energy storage unit 201 is located in the tower 200. Nacelle 100 is coupled to the top of tower 200, and the bottom of tower 200 is coupled to tower base 300. The machine side converter 102 is connected with the network side converter 301 through a direct current cable; the dc energy storage unit 201 is connected to a dc cable.
The generator-side converter 301 in the embodiment of the application is located in the nacelle 100 at the top of the tower, the alternating current output by the generator is converted into direct current through the generator-side converter 301, and then a part of the direct current passes through the tower 200 through a direct current cable and is transmitted to the grid-side converter 301 in the tower bottom 300, and is merged into the power grid through the grid-side converter 301; and the other part of the direct current is transmitted to the direct current energy storage unit 201 in the tower for storage through the direct current cable. It should be noted that the dc energy storage unit 201 may not only store the electric energy on the dc cable, but also reduce the current fluctuation on the dc bus through charging and discharging, thereby improving the quality of the electric energy output by the wind turbine generator system.
The embodiment of the application can avoid the problem of low cable utilization rate caused by the skin effect of an alternating current cable through the machine side converter at the engine room and the net side converter at the bottom of the tower, namely, when the direct current cable is adopted to transmit current in a tower barrel, the utilization rate of the cable is high, the number of the cables in the tower barrel is reduced, the cost of the cable is reduced, the problem that the skin effect of the alternating current cable causes large loss of the cable is avoided, the utilization rate of the low-voltage cable is low, the waste is serious, the number of the low-voltage cables passing through the tower barrel is large, and the pressure caused by yawing and cable releasing of an engine room system is reduced.
Meanwhile, the direct current energy storage unit is arranged in the tower barrel by utilizing the direct current cable in the tower barrel and the residual space in the tower barrel, the direct current energy storage unit can reduce current fluctuation on a direct current bus and improve the electric energy quality output by the wind generating set, and the direct current energy storage unit is positioned at the machine side end of the grid side converter, so that the influence on the grid side connection of the wind generating set is avoided in the charging and discharging process of the direct current energy storage unit, the problems of high grid connection difficulty and long authentication and testing time of a wind generating system are solved, and the economic benefit of the wind generating system is improved.
It should be noted that the generator in the embodiment of the present application may be a dual-winding motor, a three-winding motor, or a motor with other numbers of windings, and the embodiment of the present application is not limited herein. When the generator in the embodiment of the present application is a double-winding motor, the machine-side converter in the embodiment of the present application includes two converters, and the two converters are respectively connected to two windings of the double-winding motor. When the generator in the embodiment of the present application is a three-winding motor, the machine-side converter in the embodiment of the present application includes three converters, and the two converters are respectively connected to three windings of the three-winding motor. The wind generating set provided by the embodiment of the application is described below by taking a double-winding motor as an example.
Referring to fig. 2, the drawing is a schematic structural diagram of a wind turbine generator system according to an embodiment of the present application.
As shown in fig. 2, the wind turbine generator system provided in the embodiment of the present application includes a nacelle 1, a tower 2, and a tower bottom 3. The nacelle 1 mainly includes a pitch system 11, a main control system 12, a generator 13, a first machine-side converter 14, and a second machine-side converter 15. The tower 2 includes a positive bus dc cable 23, a ground bus dc cable 16, and a negative bus dc cable 24. The tower bottom 3 mainly includes a first grid-side converter 34 and a second grid-side converter 35. A first winding of the generator 13 is connected to a first machine-side converter 14 and a second winding of the generator 13 is connected to a second machine-side converter 15.
The negative bus (negative bus dc cable 24) of the first machine-side converter is connected to the positive bus (positive bus dc cable 23) of the second machine-side converter to form a first zero-ground bus; and a negative bus of the first grid-side converter is connected with a positive bus of the second grid-side converter to form a second zero-grounding bus, and the first zero-grounding bus is connected with the second zero-grounding bus through a grounding bus cable.
Referring to fig. 3, the drawing is a topological structure diagram of another combined conversion and energy storage system of a wind turbine generator system according to an embodiment of the present application.
As shown in fig. 3, the first machine-side converter 14 is connected to the first grid-side converter 34 via the positive bus dc cable 23; the second grid-side converter 35 is connected to the second machine-side converter 15 via a negative busbar dc cable 24.
Referring to fig. 4, the drawing is a perspective structural view of a wind turbine generator system according to an embodiment of the present application.
As shown in fig. 2 and 4, the tower 2 may include N sets of platform dc-coupled energy storage units (dc energy storage units) 21-2N inside, which are connected in parallel and located at different heights inside the tower. N is an integer of 1 or more. In practical applications, the maximum number of the platform dc-coupled energy storage units may be determined according to the power of the actual energy storage supplement and the number of the platforms.
In the embodiment of the present application, the DC-coupled energy storage unit 21 includes a first DC/DC/DC power converter 211, a first battery cluster system (first energy storage module) 212, a second DC/DC/DC power converter 213, and a second battery cluster system (second energy storage module) 214.
As shown in fig. 2, a positive input port of the first DC/DC power converter 211 is connected to a positive bus DC cable 23 inside the tower, and a dedicated connection terminal is reserved for the positive bus DC cable. The input negative input port of the first DC/DC power converter 211 is connected to a zero bus DC cable (ground busbar cable) 16 inside the tower, and a dedicated connection terminal is reserved for the zero bus DC cable. The positive input port of the second DC/DC power converter 213 is connected to the zero bus DC cable 16 inside the tower, and a dedicated connection terminal is reserved for the zero bus DC cable. And an input negative input port of the second DC/DC power converter 213 is connected with the negative bus direct-current cable 24 in the tower, and a special wiring terminal is reserved for the negative bus direct-current cable.
The output positive electrical port (positive input port) of the first DC/DC power converter 211 is connected to the positive pole of the energy storage battery cluster through its corresponding high voltage switch box. The output negative electrical port of the first DC/DC power converter 211 is connected to the negative pole of the energy storage battery cluster through its corresponding high voltage switch box. The high-voltage switch box is correspondingly provided with devices such as a fast-fusing and direct-current contactor and the like, and controls the on-off, overcurrent and short-circuit protection between the battery cluster and the DC/DC power converter. The structure of the second DC/DC power converter 213 is similar to that of the first DC/DC power converter 211, and the description of the embodiments of the present application is omitted here.
Referring to fig. 5, the drawing is a schematic circuit diagram of a first machine-side converter and a second machine-side converter in a combined conversion and energy storage system of a wind generating set according to an embodiment of the present application.
As shown in fig. 5, the first machine-side converter 14 of the nacelle includes a three-phase machine-side reactor 141, a three-phase bridge PWM rectifier 142, a positive dc bus bar 143, a bus capacitor pool 144, and a negative dc bus bar 145; the second machine-side converter 15 of the nacelle includes a three-phase machine-side reactor 151, a three-phase bridge PWM rectifier 152, a positive dc bus bar 153, a bus capacitor pool 154, and a negative dc bus bar 155.
The negative direct current bus 145 in the first machine side converter of the cabin is connected with the positive direct current bus 153 of the second machine side converter of the cabin and is connected with the midpoint grounding bus 16 of the cabin, so that the bus voltage of the positive direct current bus 143 of the first machine side converter of the cabin still keeps 1050V, but the bus voltage of the negative direct current bus 155 of the second machine side converter of the cabin becomes-1050V, the voltage difference of the positive bus and the negative bus of the converter of the whole cabin becomes 2100V, and the conversion from the low-voltage converter to the medium-voltage converter is realized under the condition that the low-voltage converter does not make any adjustment.
The nacelle first machine side converter positive dc bus 143 is connected to a first electrical port of the tower high voltage dc cable 23, and the nacelle second machine side converter negative dc bus 155 is connected to a first electrical port of the tower high voltage dc cable 24.
Referring to fig. 6, the drawing is a schematic circuit diagram of a first grid-side converter and a second grid-side converter in a combined conversion and energy storage system of a wind turbine generator system according to an embodiment of the present application.
As shown in fig. 6, the first grid-side converter 34 at the bottom of the tower includes a three-phase grid-side reactor 341, a three-phase bridge PWM inverter 342, a positive dc bus 343, a bus capacitor pool 344, and a negative dc bus 345. The tower bottom second grid-side converter 35 comprises a three-phase grid-side reactor 351, a three-phase bridge-type PWM inverter 352, a positive direct-current bus 353, a bus capacitor pool 354 and a negative direct-current bus 355.
The first grid side converter negative direct current busbar 345 at the tower bottom is connected with a second grid side converter positive direct current busbar 353 at the tower bottom and is connected with a midpoint grounding busbar 36 at the tower bottom, so that the bus voltage of the first grid side converter positive direct current busbar 343 at the tower bottom still keeps 1050V, but the bus voltage of the second grid side converter negative direct current busbar 355 at the tower bottom becomes-1050V, the voltage difference of the positive bus and the negative bus of the whole tower bottom becomes 2100V, and the conversion from the low-voltage converter to the medium-voltage converter is realized under the condition that the low-voltage converter is not adjusted.
The first grid-side converter positive direct current busbar 343 at the tower bottom is connected with the second electrical port of the high-voltage direct current cable 23 of the tower, and the second grid-side converter negative direct current busbar 355 at the tower bottom is connected with the second electrical port of the high-voltage direct current cable 24 of the tower. The converter cascade grounding technology reduces the insulation design cost of a medium-voltage system and has good economy. Meanwhile, in order to avoid corrosion of low current to the wind turbine tower, a special grounding copper bar is arranged in the tower, the engine room midpoint grounding busbar 16 is connected with the tower bottom midpoint grounding busbar 36, and the problem of corrosion of ground current to a metal tower is solved.
Referring to fig. 7, the figure is a schematic circuit diagram of a dc energy storage unit in a combined converter and energy storage system of a wind turbine generator system according to an embodiment of the present application.
As shown in fig. 7, the dc-coupled energy storage device is divided into a positive half-bus energy storage device and a negative half-bus energy storage device. The electrical configuration of the first DC/DC power converter 211 is: the bus-side first IGBT, the bus-side second IGBT, the bus-side third IGBT, the bus-side fourth IGBT, the bus-side first capacitor, the bus-side second capacitor, the first inductor, the second inductor, the battery-side first IGBT, the battery-side second IGBT, the battery-side third IGBT, the battery-side fourth IGBT, the battery-side first capacitor and the battery-side second capacitor.
The first IGBT on the bus side, the second IGBT on the bus side, the third IGBT on the bus side and the fourth IGBT on the bus side are sequentially connected in series; the first positive port of the first capacitor on the bus side is connected with the collector of the first IGBT on the bus side; the second negative port of the first capacitor at the bus side is connected with the emitter of the second IGBT at the bus side; the first positive port of the second capacitor on the bus side is connected with the collector of the third IGBT on the bus side; and a second negative port of the second capacitor on the bus side is connected with an emitter of the fourth IGBT on the bus side.
The emitting electrode of the first IGBT on the bus side is connected with the collecting electrode of the second IGBT together and is connected with the port on the bus side of the first inductor; the emitter of the third IGBT on the bus side is connected with the collector of the fourth IGBT and is connected with the bus side port of the second inductor; the first IGBT on the battery side, the second IGBT on the battery side, the third IGBT on the battery side and the fourth IGBT on the battery side are sequentially connected in series.
The first positive port of the first capacitor at the battery side is connected with the collector electrode of the first IGBT at the battery side; the second negative port of the first capacitor at the battery side is connected with the emitter of the second IGBT at the battery side; the first positive port of the second capacitor at the battery side is connected with the collector electrode of the third IGBT at the battery side; the second negative port of the second capacitor at the battery side is connected with the emitter of the fourth IGBT at the battery side; the emitter of the first IGBT on the battery side is connected with the collector of the second IGBT together and is connected with the battery side port of the first inductor; and the emitter of the third IGBT on the battery side is connected with the collector of the fourth IGBT and is connected with the battery side port of the second inductor.
It should be noted that, since the battery in the tower can be charged and discharged through the dc cable in the tower, the power of the tower bottom grid-side converter may be greater than the power of the nacelle machine-side converter. From the power distribution perspective, the sum of the power of the nacelle side converter and the power of the bus side energy storage device in the tower is equal to the power of the tower bottom grid side converter.
To sum up, the current transmitted in the tower barrel is changed into direct current through the machine side converter at the engine room and the net side converter at the tower bottom, so that the number of cables in the tower barrel is reduced, and the cost of the cables is reduced. Simultaneously, this application utilizes the direct current cable in the tower section of thick bamboo and the surplus space in the tower section of thick bamboo, the direct current energy storage unit has been set up in a tower section of thick bamboo, this direct current energy storage unit can reduce the current fluctuation on the direct current generating line, improve the electric energy quality of wind generating set output, and because this direct current energy storage unit is located the machine side end of net side converter, for the energy storage unit of connection in net side converter net side, in the charge-discharge process of this direct current energy storage unit, do not produce the influence to wind power generator's net side connection, the big and long problem of authentication and test time of the wind power generation system degree of difficulty of being incorporated into the power networks has been solved, wind power generation system's economic benefits has been improved.
According to the combined variable-current and energy-storage system of the wind generating set provided by the embodiment, the embodiment of the application further provides the wind generating set. The wind generating set provided by the embodiment of the application comprises a cabin, a generator, a tower bottom and a current converting and energy storing combined system of the wind generating set in the embodiment. The specific structure can be seen in fig. 2 and fig. 4 and the related explanation.
As a possible implementation, the generator in the embodiment of the present application is a double winding motor. As a possible implementation manner, the wind turbine generator system in the embodiment of the present application is a direct-drive wind turbine generator system. As a possible implementation manner, the wind turbine generator system in the embodiment of the present application is a semi-direct-drive wind turbine generator system, and the semi-direct-drive wind turbine generator system further includes a gear box, and the generator is connected with the machine-side converter through the gear box.
As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the above embodiment methods can be implemented by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present application may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network communication device such as a media gateway, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present application.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The method disclosed by the embodiment corresponds to the system disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the system part for description.
It should also be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description of the disclosed embodiments will enable those skilled in the art to make or use the various modifications of these embodiments as are suited to the particular use contemplated, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A combined variable flow and energy storage system of a wind generating set is characterized in that the combined variable flow and energy storage system comprises: the system comprises a machine side converter, a network side converter and a direct current energy storage unit;
the machine side converter is positioned in a cabin of the wind generating set, the grid side converter is positioned in a tower bottom of the wind generating set, and the direct current energy storage unit is positioned in a tower barrel of the wind generating set;
the machine side converter is connected with the network side converter through a direct current cable; the direct current energy storage unit is connected with the direct current cable.
2. The combined conversion and energy storage system of a wind turbine generator set according to claim 1, wherein the machine-side converter comprises: a first machine-side converter and a second machine-side converter; the grid-side converter comprises a first grid-side converter and a second grid-side converter;
the first machine side converter is connected with a first winding of a generator of the wind generating set, and the second machine side converter is connected with a second winding of the generator of the wind generating set; the first machine-side converter is connected with the first grid-side converter; the second machine-side converter is connected with the second net-side converter.
3. The combined variable flow and energy storage system of a wind generating set according to claim 2, wherein the dc cables comprise a positive bus dc cable, a ground busbar cable and a negative bus dc cable;
the positive bus of the first machine-side converter is connected with the positive bus of the first grid-side converter through the positive bus direct-current cable;
the negative bus of the second machine side converter is connected with the negative bus of the second network side converter through the negative bus direct current cable;
a negative bus of the first machine side converter is connected with a positive bus of the second machine side converter to form a first zero grounding bus; and the negative bus of the first grid-side converter is connected with the positive bus of the second grid-side converter to form a second zero-grounding bus, and the first zero-grounding bus is connected with the second zero-grounding bus through a grounding bus cable.
4. The combined conversion and energy storage system of a wind generating set according to claim 3, wherein the dc energy storage unit comprises a first dc/dc power converter, a second dc/dc power converter, a first dc energy storage module and a second dc energy storage module;
the positive input end of the first direct current/direct current power converter is connected with the positive bus direct current cable, and the negative input end of the first direct current/direct current power converter is connected with the grounding busbar cable; the output end of the first direct current/direct current power converter is connected with the first direct current energy storage module;
the positive input end of the second direct current/direct current power converter is connected with the grounding busbar cable, and the negative input end of the second direct current/direct current power converter is connected with the negative bus direct current cable; and the output end of the second direct current/direct current power converter is connected with the second direct current energy storage module.
5. The combined variable flow and energy storage system of a wind generating set according to claim 4, wherein the first and second DC energy storage modules are battery cluster modules.
6. The combined variable flow and energy storage system of a wind generating set according to any one of claims 1 to 5, wherein the wind generating set comprises a plurality of the DC energy storage units, and the plurality of DC energy storage units are located at different heights in a tower.
7. Wind park according to any one of claims 1 to 6, wherein the wind park comprises a nacelle, a generator, a tower bottom and a combined converter and energy storage system of the wind park.
8. Wind park according to claim 7, wherein the generator is a double winding machine.
9. Wind park according to claim 7 or 8, wherein the wind park is a direct drive wind park.
10. Wind park according to claim 7 or 8, wherein the wind park is a semi-direct drive wind park further comprising a gearbox, the generator being connected with the machine side converter through the gearbox.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123426984.4U CN216959342U (en) | 2021-12-31 | 2021-12-31 | Wind generating set and current conversion and energy storage combined system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123426984.4U CN216959342U (en) | 2021-12-31 | 2021-12-31 | Wind generating set and current conversion and energy storage combined system thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216959342U true CN216959342U (en) | 2022-07-12 |
Family
ID=82314335
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123426984.4U Active CN216959342U (en) | 2021-12-31 | 2021-12-31 | Wind generating set and current conversion and energy storage combined system thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216959342U (en) |
-
2021
- 2021-12-31 CN CN202123426984.4U patent/CN216959342U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112421670B (en) | Intermediate-frequency flexible direct-current power transmission system suitable for sending out wind power from open sea and control method thereof | |
| CN110829479A (en) | High-frequency uncontrolled rectification direct-current power transmission system of offshore wind farm | |
| CN105226714A (en) | A kind of offshore wind farm direct current converges transmission system and method for designing | |
| CN108092257B (en) | Direct-current grid-connected structure of 18-phase wind driven generator and control method thereof | |
| CN101291071A (en) | Electric inverter for direct grid connecting of wind power generation | |
| CN112072716A (en) | Power distribution network terminal electric energy router and control method thereof | |
| CN107645178B (en) | Virtual synchronous machine control system and method based on power electronic transformer | |
| CN106712084A (en) | Wind power generation system for direct current (DC) series connection of offshore wind farm | |
| CN104682412A (en) | Energy control method of energy storage system of permanent magnet synchronous wind power system | |
| Shi et al. | Decoupling control of series-connected DC wind turbines with energy storage system for offshore DC wind farm | |
| CN113794226A (en) | Low-frequency alternating-current power transmission system of offshore wind farm | |
| CN115021307A (en) | New energy power station direct current collection networking system and method | |
| CN105652116B (en) | Back-to-back test circuit based on DC/DC converter | |
| CN212392678U (en) | Offshore power transmission system | |
| CN207530550U (en) | Transmission system based on wind power plant | |
| CN201528280U (en) | Full power direct-drive type flexible grid-connection current transformer for wind turbine | |
| CN205123278U (en) | Marine wind power direct current assembles power transmission system | |
| CN216959342U (en) | Wind generating set and current conversion and energy storage combined system thereof | |
| CN106849158A (en) | A kind of wind generator system for series direct current marine wind electric field | |
| CN116094034A (en) | Offshore wind power multi-voltage-class hybrid current collection system and method thereof | |
| Ge et al. | A novel topology for HVDC link connecting to offshore wind farms | |
| CN101272088A (en) | Back-to-back striding capacitance convertor of wind power generation system | |
| Mou et al. | Modeling and control strategy for multiterminal flexible DC distribution network with echelon utilization power battery | |
| CN213937744U (en) | Offshore wind power direct current collection networking structure based on current collectors | |
| CN212392677U (en) | Offshore power transmission system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230516 Address after: 839099 Guangdong Industrial Processing Zone, Industrial Park, Yizhou District, Hami City, Xinjiang Uygur Autonomous Region Patentee after: Hami Jinfeng Wind Power Equipment Co.,Ltd. Address before: 100176 19 Kangding street, Beijing economic and Technological Development Zone, Daxing District, Beijing Patentee before: Beijing Goldwind Science & Creation Windpower Equipment Co.,Ltd. |
|
| TR01 | Transfer of patent right |