CN113054856B - Converter valve tower, converter system and wind generating set - Google Patents
Converter valve tower, converter system and wind generating set Download PDFInfo
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- CN113054856B CN113054856B CN201911379162.XA CN201911379162A CN113054856B CN 113054856 B CN113054856 B CN 113054856B CN 201911379162 A CN201911379162 A CN 201911379162A CN 113054856 B CN113054856 B CN 113054856B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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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]
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Abstract
The embodiment of the invention discloses a converter valve tower of a converter, a converter system and a wind generating set. Converter current conversion system includes: u camera net side valve tower, V camera net side valve tower, W camera net side valve tower, U camera net side reactor tower, V camera net side reactor tower and W camera net side reactor tower. The converter valve tower, the converter system and the wind generating set of the embodiment of the invention can improve the electrical control efficiency and reduce the cost.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a converter valve tower of a converter, a converter system of the converter and a wind generating set.
Background
The converter valves function to perform a current converting operation, such as converting ac power to dc power or converting dc power to ac power. Because a Modular Multi-level converter valve (MMC) can superpose and output very high voltage in a manner that a plurality of sub-modules are cascaded to form a bridge arm, the Modular Multi-level converter valve is widely applied to the fields of high-voltage frequency converters and high-voltage wind power transmission.
However, in the MMC converter valve in the prior art, the structure is mainly a back-to-back structure, and the converter valve based on the structure needs 4 converter valve towers, 12 bridge arms in total, and 4 reactor valve towers, 12 reactor groups in total, as shown in fig. 1 and fig. 2. Wherein, the upper half-bridge machine side valve tower 11 and the upper half-bridge network side valve tower 14 share a direct current positive bus, and the lower half-bridge machine side valve tower 12 and the lower half-bridge network side valve tower 13 share a direct current negative bus. Because the valve towers are large in number and high in overall cost, the valve towers are inconvenient to popularize in the field of medium-voltage frequency converters and the field of wind power generation. Meanwhile, the voltage grade of the medium-voltage motor is fixed to be 10Kv, and the motor type selection configuration is not flexible.
Therefore, a new converter valve tower and a converter system are needed.
Disclosure of Invention
The embodiment of the invention provides a converter valve tower, a converter system and a wind generating set, which can reduce the use number of converter valve towers and reactors, improve the economical efficiency of the system and facilitate the popularization in the field of medium-voltage frequency converters and the field of wind power generation.
In one aspect, an embodiment of the present invention provides a converter valve tower of a converter, where the converter valve tower includes: a U camera network side valve tower, a V camera network side valve tower and a W camera network side valve tower;
the U camera network side valve tower comprises an AU camera network bridge arm, a BU camera network bridge arm and a CU camera network bridge arm; the V camera net side valve tower comprises an AV camera net bridge arm, a BV camera net bridge arm and a CV camera net bridge arm; the W camera net side valve tower comprises an AW camera net bridge arm, a BW camera net bridge arm and a CW camera net bridge arm;
the first end of the AU camera network bridge arm, the first end of the AV camera network bridge arm and the first end of the AW camera network bridge arm are used for connecting the phase A of the power grid; the first end of the BU camera network bridge arm, the first end of the BV camera network bridge arm and the first end of the BW camera network bridge arm are used for connecting a phase B of a power grid; the first end of the CU camera network bridge arm, the first end of the CV camera network bridge arm and the first end of the CW camera network bridge arm are used for connecting the C phase of the power grid;
the second end of the AU camera network bridge arm, the second end of the BU camera network bridge arm and the second end of the CU camera network bridge arm are mutually connected and used for connecting a U-phase port of the motor; the second end of the AV camera network bridge arm, the second end of the BV camera network bridge arm and the second end of the CV camera network bridge arm are connected with each other and used for connecting a V-phase port of the motor; and the second end of the AW camera net bridge arm, the second end of the BW camera net bridge arm and the second end of the CW camera net bridge arm are mutually connected and used for connecting a W-phase port of the motor.
In one possible embodiment of the first aspect, each camera net bridge arm in each camera net side valve tower comprises at least one valve segment; valve sections of the same camera net bridge arm are connected in series; the valve sections of different camera net bridge arms in the same camera net side valve tower are installed in layers, and the valve sections of the same camera net bridge arm are installed in the same layer.
In one possible embodiment of the first aspect, the valve segments in the same camera net bridge arm are connected in series by copper bars.
In a possible embodiment of the first aspect, each valve section comprises at least one power module and an insulating support beam, the power modules being connected in cascade and mounted on the insulating support beam.
In a possible embodiment of the first aspect, each insulating support beam is mounted on an insulating support column.
In one possible implementation of the first aspect, the power module comprises an H-bridge power module.
In one possible embodiment of the first aspect, the power module further includes a bypass switch, the first electrical interface of the bypass switch is connected to the first ac port of the power module, and the second electrical interface of the bypass switch is connected to the second ac port of the power module.
In a second aspect, an embodiment of the present invention provides a converter system, where the converter system includes: the converter valve tower, the U camera network side reactor tower, the V camera network side reactor tower and the W camera network side reactor tower are provided by the embodiment of the invention; wherein the content of the first and second substances,
the U camera network side reactor tower comprises an AU camera network side reactor, a BU camera network side reactor and a CU camera network side reactor; the V camera network side reactor tower comprises an AV camera network side reactor, a BV camera network side reactor and a CV camera network side reactor; the W camera network side reactor tower comprises an AW camera network side reactor, a BW camera network side reactor and a CW camera network side reactor;
the first end of the AU camera network side reactor is used for connecting the phase A of the power grid, and the second end of the AU camera network side reactor is used for connecting the first end of the AU camera network bridge arm; the first end of the BU camera network side reactor is used for connecting a phase B of a power grid, and the second end of the BU camera network side reactor is used for connecting the first end of a BU camera network bridge arm; the first end of the CU camera network side reactor is used for connecting a phase C of a power grid, and the second end of the CU camera network side reactor is used for connecting the first end of a CU camera network bridge arm;
the first end of the AV camera network side reactor is used for connecting an A phase of a power grid, and the second end of the AV camera network side reactor is used for connecting the first end of an AV camera network bridge arm; the first end of the BV camera network side reactor is used for connecting a phase B of a power grid, and the second end of the BV camera network side reactor is used for connecting the first end of a BV camera network bridge arm; the first end of the CV camera network side reactor is used for connecting the C phase of the power grid, and the second end of the CV camera network side reactor is used for connecting the first end of a CV camera network bridge arm;
the first end of the AW camera network side reactor is used for connecting the phase A of the power grid, and the second end of the AW camera network side reactor is used for connecting the first end of an AW camera network bridge arm; the first end of the BW camera network side reactor is used for connecting the phase B of the power grid, and the second end of the BW camera network side reactor is used for connecting the first end of a BW camera network bridge arm; the first end of the CW camera network side reactor is used for being connected with a C phase of a power grid, and the second end of the CW camera network side reactor is used for being connected with the first end of a CW camera network bridge arm.
In a possible embodiment of the second aspect, the grid-side reactors in the same camera grid-side reactor tower are installed in layers, and the grid-side reactors in the same camera grid-side reactor tower are insulated from each other.
In a third aspect, an embodiment of the present invention provides a wind turbine generator system, which includes the converter commutation system as described above.
Compared with the converter valve towers based on the back-to-back structure in the prior art, the converter valve converter in the embodiment of the invention adopts the full-bridge module design, so that the converter valve converter is optimized to be arranged in parallel according to the U camera network side valve tower, the V camera network side valve tower and the W camera network side valve tower of the motor in the layout mode of all the sub-valve towers in the converter valve tower structure of the converter according to the parallel arrangement of the upper bridge arm valve tower on the machine side, the lower bridge arm valve tower on the machine side, the upper bridge arm valve tower on the network side and the lower bridge arm valve tower on the network side, thereby achieving the purposes of reducing the number of the converter valve towers and the number of the reactors, improving the economical efficiency of the system and being beneficial to popularization in the field of medium voltage frequency converters and the field of wind power generation. Meanwhile, the embodiment of the invention can be adapted to medium-voltage motors with a plurality of voltage grades, and the configuration is more flexible.
Drawings
The present invention may be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which like or similar reference characters identify like or similar features.
Fig. 1 is an external view of a converter valve of a current transformer in the prior art;
FIG. 2 is an electrical topology corresponding to the converter valve tower of the converter of FIG. 1;
fig. 3 is an external view of a structure of a converter valve tower of a three-phase converter according to an embodiment of the present invention;
FIG. 4 is an electrical topology corresponding to the converter valve tower of the converter of FIG. 3;
FIG. 5 is a structural layout diagram corresponding to the converter valve tower of the converter in FIG. 3;
FIG. 6 is one of the individual schematic diagrams of the structural layout of the U-camera net side valve tower of FIG. 5;
FIG. 7 is a schematic diagram showing the structural layout of the AU camera bridge arm of FIG. 5 in isolation;
FIG. 8 is a second schematic diagram of the structural layout of the U-camera net side valve tower of FIG. 5;
FIG. 9 is a schematic diagram of the connection of two adjacent arms of FIG. 8;
FIG. 10 is an isolated schematic view of the boxed valve section of FIG. 9;
FIG. 11 is a cascaded electrical topology of power modules in a single valve section;
fig. 12 is an external view of a structure of a converter system of a converter according to an embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention.
Fig. 3 is an external view of a structure of a converter valve tower of a three-phase converter according to an embodiment of the present invention. Fig. 4 is an electrical topology corresponding to the converter valve tower of the converter in fig. 3. Fig. 5 is a structural layout diagram corresponding to the converter valve tower of the converter in fig. 3.
Referring to fig. 3-5, the converter valve tower mainly comprises: a U-camera net side valve tower 31, a V-camera net side valve tower 32, and a W-camera net side valve tower 33.
The U camera network side valve tower 31 includes an AU camera network bridge arm 311, a BU camera network bridge arm 312, and a CU camera network bridge arm 313; the V-camera net side valve tower 32 comprises an AV camera net bridge arm 321, a BV camera net bridge arm 322 and a CV camera net bridge arm 323; the W-camera net side valve tower 33 includes an AW camera net bridge arm 331, a BW camera net bridge arm 332, and a CW camera net bridge arm 333.
The first end of the AU camera network bridge arm 311, the first end of the AV camera network bridge arm 321 and the first end of the AW camera network bridge arm 331 are used for connecting the phase A of the power grid; the first end of the BU camera network leg 312, the first end of the BV camera network leg 322, and the first end of the BW camera network leg 332 are used to connect phase B of the power grid; the first end of the CU camera net bridge arm 313, the first end of the CV camera net bridge arm 323, and the first end of the CW camera net bridge arm 333 are used to connect the C-phase of the power grid.
The second end of the AU camera network bridge arm 311, the second end of the BU camera network bridge arm 312 and the second end of the CU camera network bridge arm 313 are connected with each other and used for connecting a U-phase port of a motor; the second end of the AV camera network bridge arm 321, the second end of the BV camera network bridge arm 322 and the second end of the CV camera network bridge arm 323 are connected with each other and used for connecting a V-phase port of a motor; the second end of the AW camera net bridge arm 331, the second end of the BW camera net bridge arm 332, and the second end of the CW camera net bridge arm 333 are connected to each other for connecting to the W-phase port of the motor.
Comparing fig. 3, 4, 1 and 2, it can be seen that, compared with the converter valve towers based on the back-to-back structure in the prior art, the converter valve in the embodiment of the present invention adopts a full-bridge module design, so that the layout of each sub-valve tower in the converter valve tower structure is optimized to be parallel arrangement according to the U-camera net side valve tower 31, the V-camera net side valve tower 32 and the W-camera net side valve tower 33 of the motor from parallel arrangement according to the machine side upper bridge arm valve tower, the machine side lower bridge arm valve tower, the net side upper bridge arm valve tower and the net side lower bridge arm valve tower, thereby achieving the purpose of reducing the number of the converter valve towers and reducing the cost, and being beneficial to popularization in the field of medium voltage frequency converters and wind power generation.
In addition, in the embodiment of the invention, the power grid configuration of the medium-voltage motor is flexible according to the way that the U camera grid side valve tower 31, the V camera grid side valve tower 32 and the W camera grid side valve tower 33 of the motor are arranged in parallel, and can cover a plurality of voltage levels of 690V, 1140V, 3.3kV, 6kV, 10Kv and the like.
The following is a detailed description of the spatial structure and electrical connection relationship of the converter valve tower of the converter.
In the converter valve tower provided by the embodiment of the invention, each camera network bridge arm in each camera network side valve tower comprises at least one valve segment; valve sections of the same camera net bridge arm are connected in series; the valve sections of different camera net bridge arms in the same camera net side valve tower are installed in layers, and the valve sections of the same camera net bridge arm are installed in the same layer.
Fig. 6 is one of the individual schematic diagrams of the structural layout of the U-camera net side valve tower of fig. 5.
Referring to fig. 6, AU camera net bridge arm 311 in U camera net side valve tower 31 includes valve segment 1-valve segment N connected in series in sequence, BU camera net bridge arm 312 includes valve segment 1-valve segment N connected in series in sequence, and CU camera net bridge arm 313 includes valve segment 1-valve segment N connected in series in sequence. The valve section string of the AU camera network bridge arm 311, the valve section string of the BU camera network bridge arm 312 and the valve section string of the CU camera network bridge arm 313 are sequentially arranged in a layered mode. In the example of fig. 6, the U-camera-net-side valve tower 31 has a three-layer structure, where from top to bottom, the first layer is an AU-camera-net-bridge arm 311, the second layer is a BU-camera-net-bridge arm 312, and the third layer is a CU-camera-net-bridge arm 313.
Fig. 7 is a separate schematic diagram of the structural layout of the AU camera bridge arm 311 in fig. 5.
Referring to fig. 7, valve section 1-valve section N of AU camera bridge arm 311 are mounted on insulating support beams 315, and insulating support beams 315 are mounted on insulating support posts 314.
Referring to fig. 5, an AV camera network bridge arm 321 in the V camera network side valve tower 32 includes a valve segment 1-a valve segment N connected in series in sequence, a BV camera network bridge arm 322 includes a valve segment 1-a valve segment N connected in series in sequence, and a CV camera network bridge arm 323 includes a valve segment 1-a valve segment N connected in series in sequence. The valve section string of the AV camera network bridge arm 321, the valve section string of the BV camera network bridge arm 322 and the valve section string of the CV camera network bridge arm 323 are sequentially arranged in a layered manner. In the example of fig. 5, the V-camera net side valve tower 32 has a three-layer structure, where from top to bottom, the first layer of the V-camera net side valve tower 32 is an AV-camera net bridge arm 321, the second layer is a BV-camera net bridge arm 322, and the third layer is a CV-camera net bridge arm 323.
Referring to fig. 5, an AW camera net bridge arm 331 in the W camera net side valve tower 33 includes a valve segment 1-a valve segment N sequentially connected in series, a BW camera net bridge arm 332 includes a valve segment 1-a valve segment N sequentially connected in series, and a CW camera net bridge arm 333 includes a valve segment 1-a valve segment N sequentially connected in series. The valve section string of the AW camera net bridge arm 331, the valve section string of the BW camera net bridge arm 332 and the valve section string of the CW camera net bridge arm 333 are sequentially arranged in a layered manner. In the example of fig. 5, the W-camera net side valve tower 33 has a three-layer structure, where from top to bottom, the first layer of the W-camera net side valve tower 33 is an AW-camera net bridge arm 331, the second layer is a BW-camera net bridge arm 332, and the third layer is a CW-camera net bridge arm 333.
Fig. 8 is a second separate schematic diagram of the structural layout of the U-camera net side valve tower for showing the combination relationship of the single-phase converter valve tower.
In the example of fig. 8, each leg in the U-camera net side valve tower 31 consists of three valve segments. Wherein the three valve segments making up AU camera net bridge arm 311 are numbered 3111, 3112 and 3113, the three valve segments making up BU camera net bridge arm 312 are numbered 3121, 3122 and 3123, and the three valve segments making up CU camera net bridge arm 313 are numbered 3131, 3132 and 3133.
For example, the valve section 3111 of the AU camera net bridge arm 311 is correspondingly installed on the valve section 3121 of the BU camera net bridge arm 312, and the valve section 3121 of the BU camera net bridge arm 312 is correspondingly installed on the valve section 3131 of the CU camera net bridge arm 313, thereby forming a three-layer valve tower structure.
In specific implementation, the layer where the bridge arm of the camera a is located in each machine network side valve tower can be interchanged with the layer where the bridge arm of the camera C is located. For example, the AU camera network bridge arm 311 in the U camera network side valve tower 31 is disposed on the first layer, the CU camera network bridge arm 313 is disposed on the third layer, and after the exchange, the AU camera network bridge arm 311 is disposed on the third layer, and the CU camera network bridge arm 313 is disposed on the first layer. Since adjusting the position of the B-camera network bridge arm results in unsmooth power routing, the position of the B-camera network bridge arm is generally not adjusted.
Fig. 9 is a schematic diagram of the connection between two adjacent bridge arms in fig. 8. Fig. 10 is an isolated schematic view of the boxed valve section of fig. 9. Referring to fig. 9 and 10, each valve section includes at least one power module and an insulating support beam 315. Several power modules MMCi are cascaded to form a valve section, which is mounted on an insulating support beam 315, and the insulating support beam 315 is mounted on an insulating support 314.
In the embodiment of the present invention, adjacent valve sections belonging to the same camera net bridge arm may be connected in series by copper bars 316 or cables. Compared to a cable, the copper bars 316 are preferably used for connection because the copper bars 316 occupy a small space and have high conduction efficiency. Taking i-7 as an example, the 7 th power module MMC7 of the previous valve segment and the 1 st power module MMC1 of the next valve segment form an electrical cascade connection through the electrical connection copper bar 316, and the valve segment cascade connection can raise the voltage higher.
FIG. 11 is a cascaded electrical topology of power modules in a single valve section. Referring to fig. 11, the voltage level of the valve section is cascaded by n H-bridge power modules, and the value of n can be determined according to the device specification and the system voltage level. Note that the type of the power module is not limited to the H-bridge structure shown in fig. 11.
In some embodiments, the power module further includes a bypass switch k1 (see fig. 11), the first electrical interface of the bypass switch being connected to the first ac port of the power module, and the second electrical interface of the bypass switch being connected to the second ac port of the power module. By the arrangement, when the power module fails, the main control can trigger the bypass switch to act, so that the bypass switch is switched on, and a fault module bypass is removed, so that the normal operation of a high-voltage complete machine system is guaranteed.
During specific implementation, the number of triggered bypass switches cannot exceed a preset safety threshold, and when the number of triggered bypass switches exceeds the preset safety threshold, a whole machine system needs to be controlled to trip and shut down so as to avoid damage to the whole machine. Illustratively, the preset safety threshold may be 10% of the number of bridge arm modules.
Fig. 12 is an external view of a structure of a converter system of a converter according to an embodiment of the present invention.
Referring to fig. 12, the converter system includes a three-phase converter valve tower, a U-camera network side reactor tower 34, a V-camera network side reactor tower 35, and a W-camera network side reactor tower 36 in any of the above embodiments.
Referring to fig. 4 and 5, the U camera network side reactor tower 34 includes an AU camera network side reactor 341, a BU camera network side reactor 342, and a CU camera network side reactor 343; the V-camera network side reactor tower 35 comprises an AV-camera network side reactor 351, a BV-camera network side reactor 352 and a CV-camera network side reactor 353; the W camera grid side reactor tower 36 includes an AW camera grid side reactor 361, a BW camera grid side reactor 362, and a CW camera grid side reactor 363.
A first end of the AU camera network side reactor 341 is used for connecting the phase a of the power network, and a second end is used for connecting the first end of the AU camera network bridge arm 311; a first end of the BU camera net side reactor 342 is used to connect phase B of the grid, and a second end is used to connect a first end of the BU camera net arm 312; the first end of the CU camera grid side reactor 343 is used to connect the C phase of the grid, and the second end is used to connect the first end of the CU camera grid arm 313.
The first end of the AV camera network side reactor 351 is used for connecting the a phase of the power network, and the second end is used for connecting the first end of the AV camera network bridge arm 321; a first end of BV camera network side reactor 352 is used to connect phase B of the network and a second end is used to connect a first end of BV camera network bridge arm 322; the first end of the CV camera network side reactor 353 is used for connecting a phase C of a power network, and the second end of the CV camera network side reactor is used for connecting the first end of the CV camera network bridge arm 323.
A first end of an AW camera network side reactor 361 is used for connecting a phase a of the power network, and a second end is used for connecting a first end of an AW camera network bridge arm 331; a first end of the BW camera network side reactor 362 is used for connecting the B phase of the power network, and a second end is used for connecting a first end of the BW camera network bridge arm 332; the first end of the CW camera network side reactor 363 is used for connecting the C phase of the power network, and the second end is used for connecting the first end of the CW camera network bridge arm 333.
The machine network side reactors in the same camera network side reactor tower are installed in a layered mode, and the machine network side reactors in the same camera network side reactor tower are insulated.
Specifically, see fig. 5, 6 and 8:
The AV phase reactor 351 in the V-camera grid side reactor tower 35 is correspondingly mounted on the BV camera reactor 352, and the BV reactor 352 is correspondingly mounted on the CV camera reactor 353, thereby constituting the V-camera grid side reactor tower 35 of a three-layer structure.
An AW phase reactor 361 in the W camera net side reactor tower 36 is correspondingly installed on a BW camera reactor 362, and the BW reactor 362 is correspondingly installed on a CW camera reactor 363, thereby constituting the W camera net side reactor tower 36 of a three-layer structure.
As can be seen by comparing fig. 12 and fig. 2, compared with the converter system based on the back-to-back structure in the prior art, the converter system in the embodiment of the present invention adopts a full-bridge module design, so that the layout manner of each sub-valve tower in the converter valve tower structure of the converter is optimized to be arranged in parallel according to the U-camera net side valve tower 31, the V-camera net side valve tower 32, and the W-camera net side valve tower 33 of the motor from the parallel arrangement of the machine side upper bridge arm valve tower, the machine side lower bridge arm valve tower, the net side upper bridge arm valve tower, and the net side lower bridge arm valve tower, and the number of the valve towers is reduced; and the layout mode of each reactor tower in the reactor tower structure is optimized to be parallel arrangement according to the U camera network side reactor tower 34, the V camera network side reactor tower 35 and the W camera network side reactor tower 36 of the motor from parallel arrangement according to the machine side upper bridge arm reactor tower, the machine side lower bridge arm reactor tower, the network side upper bridge arm reactor tower and the network side lower bridge arm reactor tower, so that the number of the reactor towers is reduced, the cost can be reduced, and the reactor tower structure is favorable for popularization in the field of medium-voltage frequency converters and the field of wind power generation.
In addition, compared with the converter valve system based on the back-to-back structure in the prior art, the power grid configuration of the medium-voltage motor is more flexible according to the way that the U camera grid side valve tower 31, the V camera grid side valve tower 32 and the W camera grid side valve tower 33 of the motor are arranged in parallel, and can cover a plurality of power grid voltage levels of 690V, 1140V, 3.3kV, 6kV, 10Kv and the like.
When the wind driven generator is applied to the field of medium-voltage wind power generation, the medium-voltage motor can be used as a medium-voltage wind driven generator, a 10KV medium-voltage power grid is taken as an example, a boosting transformer can be connected behind the 10KV medium-voltage power grid, and the 10KV voltage is boosted to 35KV wind power plant networking bus voltage level.
The embodiment of the invention also provides a wind generating set which comprises the converter commutation system provided by any embodiment of the invention.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For the device embodiments, reference may be made to the description of the method embodiments in the relevant part. Embodiments of the invention are not limited to the specific steps and structures described above and shown in the drawings. Those skilled in the art may make various changes, modifications and additions or change the order between the steps after appreciating the spirit of the embodiments of the invention. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of an embodiment of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranets, etc.
Embodiments of the present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. For example, the algorithms described in the specific embodiments may be modified without departing from the basic spirit of the embodiments of the present invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the embodiments of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. A converter valve tower, characterized in that said converter valve tower comprises: a U camera network side valve tower, a V camera network side valve tower and a W camera network side valve tower;
the U camera network side valve tower comprises an AU camera network bridge arm, a BU camera network bridge arm and a CU camera network bridge arm; the V camera net side valve tower comprises an AV camera net bridge arm, a BV camera net bridge arm and a CV camera net bridge arm; the W camera net side valve tower comprises an AW camera net bridge arm, a BW camera net bridge arm and a CW camera net bridge arm;
the first end of the AU camera network bridge arm, the first end of the AV camera network bridge arm and the first end of the AW camera network bridge arm are used for being connected with an A phase of a power grid; the first end of the BU camera network bridge arm, the first end of the BV camera network bridge arm and the first end of the BW camera network bridge arm are used for connecting a phase B of a power grid; the first end of the CU camera network bridge arm, the first end of the CV camera network bridge arm and the first end of the CW camera network bridge arm are used for being connected with a C phase of a power grid;
the second end of the AU camera network bridge arm, the second end of the BU camera network bridge arm and the second end of the CU camera network bridge arm are mutually connected and used for connecting a U-phase port of the motor; the second end of the AV camera network bridge arm, the second end of the BV camera network bridge arm and the second end of the CV camera network bridge arm are connected with each other and used for connecting a V-phase port of the motor; and the second end of the AW camera net bridge arm, the second end of the BW camera net bridge arm and the second end of the CW camera net bridge arm are mutually connected and used for connecting a W-phase port of the motor.
2. The converter valve tower of claim 1, wherein each camera net bridge arm in each camera net side valve tower comprises at least one valve segment; valve sections of the same camera net bridge arm are connected in series; the valve sections of different camera net bridge arms in the same camera net side valve tower are installed in layers, and the valve sections of the same camera net bridge arm are installed in the same layer.
3. The converter valve tower of claim 2, wherein valve segments in the same camera net bridge arm are connected in series by copper bars.
4. The converter valve tower of claim 2, wherein each valve section comprises at least one power module and an insulating support beam, said power modules being connected in cascade and mounted on said insulating support beam.
5. The converter valve tower of claim 4, wherein each insulating support beam is mounted on an insulating support column.
6. The converter valve tower of claim 4, wherein the power module comprises an H-bridge power module.
7. The converter valve tower of claim 4, wherein said power module further comprises a bypass switch, a first electrical interface of said bypass switch being connected to said power module first AC port, and a second electrical interface of said bypass switch being connected to said power module second AC port.
8. A converter commutation system, comprising: the converter valve tower of any one of claims 1 to 7, a U-camera network side reactor tower, a V-camera network side reactor tower and a W-camera network side reactor tower; wherein the content of the first and second substances,
the U camera network side reactor tower comprises an AU camera network side reactor, a BU camera network side reactor and a CU camera network side reactor; the V camera network side reactor tower comprises an AV camera network side reactor, a BV camera network side reactor and a CV camera network side reactor; the W camera network side reactor tower comprises an AW camera network side reactor, a BW camera network side reactor and a CW camera network side reactor;
the first end of the AU camera network side reactor is used for connecting the phase A of the power grid, and the second end of the AU camera network side reactor is used for connecting the first end of the AU camera network bridge arm; the first end of the BU camera network side reactor is used for connecting a phase B of a power network, and the second end of the BU camera network side reactor is used for connecting the first end of a bridge arm of the BU camera network; the first end of the CU camera network side reactor is used for being connected with the phase C of a power grid, and the second end of the CU camera network side reactor is used for being connected with the first end of a CU camera network bridge arm;
the first end of the AV camera network side reactor is used for connecting the phase A of the power grid, and the second end of the AV camera network side reactor is used for connecting the first end of the AV camera network bridge arm; the first end of the BV camera network side reactor is used for connecting a phase B of a power grid, and the second end of the BV camera network side reactor is used for connecting the first end of a BV camera network bridge arm; the first end of the CV camera network side reactor is used for connecting a phase C of a power grid, and the second end of the CV camera network side reactor is used for connecting the first end of a CV camera network bridge arm;
the first end of the AW camera network side reactor is used for connecting the phase A of the power grid, and the second end of the AW camera network side reactor is used for connecting the first end of an AW camera network bridge arm; the first end of the BW camera network side reactor is used for connecting the phase B of the power grid, and the second end of the BW camera network side reactor is used for connecting the first end of a BW camera network bridge arm; and the first end of the CW camera network side reactor is used for connecting the C phase of a power grid, and the second end of the CW camera network side reactor is used for connecting the first end of a CW camera network bridge arm.
9. The converter system according to claim 8, wherein grid side reactors in the same camera grid side reactor tower are installed in layers, and the grid side reactors in the same camera grid side reactor tower are insulated from each other.
10. A wind power plant, characterized in that it comprises: the converter system of claim 8 or 9.
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| US6900998B2 (en) * | 2002-05-31 | 2005-05-31 | Midwest Research Institute | Variable-speed wind power system with improved energy capture via multilevel conversion |
| CN101079578A (en) * | 2006-12-01 | 2007-11-28 | 徐克祥 | Matrix converter |
| CN100536305C (en) * | 2007-11-16 | 2009-09-02 | 华中科技大学 | Control method for matrix transforming machine and its device |
| CN101465606A (en) * | 2008-09-17 | 2009-06-24 | 刘建政 | Parallel-in converter for directly-driving wind power generation system |
| JP5872480B2 (en) * | 2009-12-01 | 2016-03-01 | アーベーベー・シュバイツ・アーゲー | Method for operating a converter circuit and apparatus for carrying out this method |
| JP5752704B2 (en) * | 2009-12-17 | 2015-07-22 | アーベーベー・シュバイツ・アーゲー | Method for operating a direct converter circuit and apparatus for performing the method |
| CN102157958A (en) * | 2011-03-22 | 2011-08-17 | 深圳市禾望电气有限公司 | Wind generating unit using multiple-winding generator |
| CN103560687B (en) * | 2013-09-27 | 2016-05-18 | 株洲变流技术国家工程研究中心有限公司 | Modular multi-level converter system, and control system and control method |
| CN108631356B (en) * | 2017-12-26 | 2019-11-29 | 北京金风科创风电设备有限公司 | Converter for wind power plant power transmission system and wind power plant power transmission system |
| CN108512440A (en) * | 2018-05-04 | 2018-09-07 | 北京金风科创风电设备有限公司 | Current conversion device and bipolar current conversion system |
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