CN116525290A - Capacitor pool, converter, wind generating set and forming method of capacitor pool - Google Patents

Capacitor pool, converter, wind generating set and forming method of capacitor pool Download PDF

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Publication number
CN116525290A
CN116525290A CN202210079182.0A CN202210079182A CN116525290A CN 116525290 A CN116525290 A CN 116525290A CN 202210079182 A CN202210079182 A CN 202210079182A CN 116525290 A CN116525290 A CN 116525290A
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CN
China
Prior art keywords
capacitor
core
cavity
groups
core groups
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.)
Pending
Application number
CN202210079182.0A
Other languages
Chinese (zh)
Inventor
吕梁年
刘舒恒
杨志千
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
Original Assignee
Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Beijing Goldwind Science and Creation Windpower Equipment Co Ltd filed Critical Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
Priority to CN202210079182.0A priority Critical patent/CN116525290A/en
Priority to PCT/CN2022/103027 priority patent/WO2023137993A1/en
Publication of CN116525290A publication Critical patent/CN116525290A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
    • H01G2/08—Cooling arrangements; Heating arrangements; Ventilating arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
    • H01G2/10—Housing; Encapsulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
    • H01G2/10—Housing; Encapsulation
    • H01G2/106—Fixing the capacitor in a housing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/002—Details
    • H01G4/224—Housing; Encapsulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/002—Details
    • H01G4/228—Terminals
    • H01G4/236—Terminals leading through the housing, i.e. lead-through
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/38—Multiple capacitors, i.e. structural combinations of fixed capacitors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Inverter Devices (AREA)

Abstract

The application relates to a capacitor cell, converter, wind generating set and capacitor cell's shaping method, and the capacitor cell includes: the core groups comprise a plurality of capacitor cores which are sequentially arranged along the first direction, the number of the core groups is multiple groups and are mutually insulated, and a splicing cavity is formed between at least two groups of core groups; the radiator is positioned in the splicing cavity and is arranged in an insulating mode with each core group, the radiator is provided with a cooling cavity, an inlet and an outlet, the inlet and the outlet are communicated with the cooling cavity, and cooling liquid can enter the cooling cavity through the inlet and is discharged out of the cooling cavity through the outlet after heat exchange with the capacitor cores. According to the capacitor pool, the converter, the wind generating set and the forming method of the capacitor pool, the capacitor pool can stabilize direct-current bus voltage, heat dissipation of the capacitor pool is good, and service life of the capacitor core can be guaranteed.

Description

Capacitor pool, converter, wind generating set and forming method of capacitor pool
Technical Field
The application relates to the technical field of capacitor ponds, in particular to a capacitor pond, a converter, a wind generating set and a forming method of the capacitor pond.
Background
The converter can realize the conversion of alternating current-direct current-alternating current between the wind generating set and the power grid, can convert the electric energy which is continuously changed in voltage and frequency and output by the generator into the constant-voltage and constant-frequency alternating current electric energy which is fed into the power grid, and is one of the important core components of the wind generating set. The current wind generating set is commonly used as a three-level converter, and the three-level converter utilizes a capacitor pool to stabilize the voltage of a direct current bus and prevent the direct current bus voltage from greatly fluctuating due to abrupt change of loads.
The conventional capacitor cell is formed by arranging standardized capacitor cores on a laminated busbar, and the capacitor cell mainly uses a fan to force air outside the capacitor cell to enter the capacitor cell for cooling, so that the dependence on the environment temperature is strong, the heat dissipation effect is poor, and the service life of the capacitor core is influenced.
Disclosure of Invention
The embodiment of the application provides a capacitor pool, a converter, a wind generating set and a forming method of the capacitor pool, wherein the capacitor pool is good in heat dissipation, and the service life of a capacitor core can be guaranteed.
In one aspect, according to an embodiment of the present application, there is provided a capacitor cell, including: the core groups comprise a plurality of capacitor cores which are sequentially arranged along the first direction, the number of the core groups is multiple groups and are mutually insulated, and a splicing cavity is formed between at least two groups of core groups; the radiator is positioned in the splicing cavity and is arranged in an insulating mode with each core group, the radiator is provided with a cooling cavity, an inlet and an outlet, the inlet and the outlet are communicated with the cooling cavity, and cooling liquid can enter the cooling cavity through the inlet and is discharged out of the cooling cavity through the outlet after heat exchange with the capacitor cores.
According to one aspect of the embodiment of the application, the plugging cavity is penetrated along the first direction, the radiator is strip-shaped and is matched with the shape of the plugging cavity, the inlet is arranged at one end of the radiator in the first direction, and the outlet is arranged at the other end of the radiator in the first direction.
According to one aspect of the embodiment of the application, a plug cavity is formed between any two core groups of the plurality of core groups, and a radiator is arranged in each plug cavity.
According to one aspect of the embodiments of the present application, the capacitor cell further includes an insulating connector filled in the gaps between the core groups and the heat sink.
According to an aspect of the embodiments of the present application, the capacitor cell further includes a housing, the core assembly and the heat sinks are disposed in the housing, and the cooling fluid flowing through the at least one heat sink is capable of exchanging heat with the housing.
According to an aspect of the embodiments of the present application, the capacitor cell further includes a connection piece and a connection terminal, the connection piece is disposed in the housing, and the at least two capacitor cores are electrically connected through the connection piece, each connection piece is connected with the connection terminal, the connection terminal is at least partially protruded out of the housing, and the cooling liquid flowing through the at least one radiator can exchange heat with at least one of the connection piece and the connection terminal.
According to an aspect of the embodiments of the present application, the capacitor cell further includes a fixing base, and more than two fixing bases are connected to the housing, and fixing interfaces are provided on the fixing bases.
According to one aspect of the embodiments of the present application, the capacitive cell further comprises a first connecting line through which the inlet of one of the at least two heat sinks communicates with the outlet of the other.
According to one aspect of the embodiments of the present application, the capacitor cell further includes a bus bar having a first port and a plurality of second ports in communication with the first port, each first port in communication with the inlet or the outlet via the second connection.
According to an aspect of embodiments of the present application, the capacitor cell further includes a support frame, and each side of the radiator in the first direction is connected to and supported by the support frame.
According to one aspect of the embodiments of the present application, the plurality of sets of core groups are arranged in rows and columns, at least two of the plurality of sets of core groups are arranged in rows and columns in succession and at least two of the plurality of sets of core groups are arranged in columns and in succession, the rows, columns and the first direction being perpendicular to each other.
According to an aspect of the embodiments of the present application, each adjacent four of the plurality of core groups together enclose the plugging cavity, two of the four core groups enclosing the same plugging cavity are distributed successively in the row direction and the remaining two core groups are distributed successively in the column direction.
In another aspect, according to an embodiment of the present application, there is provided a current transformer, including: the machine side power module is used for converting alternating current into direct current; the network side power module is used for converting direct current into alternating current; the capacitor pool is electrically connected with the machine side power module and the network side power module through the core group.
In yet another aspect, according to an embodiment of the present application, a wind generating set is provided, including the converter described above.
In still another aspect, according to an embodiment of the present application, a method for forming a capacitor cell is provided, including:
providing a plurality of capacitor cores, and grouping and arranging the capacitor cores to form a plurality of core groups, wherein each core group comprises a plurality of capacitor cores which are sequentially arranged along a first direction, and a splicing cavity is formed between at least two core groups;
inserting a radiator into the insertion cavity, wherein the radiator is provided with a cooling cavity, an inlet and an outlet, the inlet and the outlet are communicated with the cooling cavity, and cooling liquid can enter the cooling cavity from the inlet and be discharged from the outlet after heat exchange with the capacitor core;
providing a shell, transferring the whole formed by a plurality of groups of core groups and the radiator into the shell, and fixing the relative positions of the core groups and the radiator and the shell respectively;
and injecting insulating resin into the shell, so that the insulating resin fills gaps among the core groups and gaps between the core groups and the radiator, and forming the capacitor cell after the insulating resin is solidified.
According to the capacitor pool, the converter, the wind generating set and the forming method of the capacitor pool, the capacitor pool comprises a core group and a radiator, the core group comprises a plurality of capacitor cores which are sequentially arranged along a first direction, the core groups are in a plurality of groups and are arranged in an insulating mode, the capacitor pool can be electrically connected with external components through the core groups, due to the fact that the inserting cavity is formed between at least two groups of core groups, the radiator is located in the inserting cavity and is arranged in an insulating mode with each core group, meanwhile, the radiator is provided with a cooling cavity, an inlet and an outlet which are communicated with the cooling cavity, and cooling liquid can enter the cooling cavity through the inlet and is discharged out of the cooling cavity through the outlet after being subjected to heat exchange with the capacitor cores. The cooling mode is adopted to realize cooling, so that the heat dissipation condition of the capacitor pool can be optimized, the dependence on the environmental temperature is reduced, the heat dissipation effect is good, and the service life of the capacitor pool is ensured.
Drawings
Features, advantages, and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.
FIG. 1 is a schematic structural view of a wind turbine generator system according to one embodiment of the present application;
fig. 2 is a schematic structural diagram of a current transformer according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a capacitor cell structure according to one embodiment of the present application;
FIG. 4 is a cross-sectional view of a heat sink according to one embodiment of the present application;
FIG. 5 is a schematic partial structure of a capacitor cell according to one embodiment of the present application;
FIG. 6 is a schematic diagram of a capacitor cell according to another embodiment of the present application;
FIG. 7 is a schematic diagram of a capacitor cell according to yet another embodiment of the present application;
FIG. 8 is a schematic diagram illustrating the mating of a heat sink with a first connection circuit according to one embodiment of the present disclosure;
fig. 9 is a flow chart of a method for forming a capacitor cell according to an embodiment of the present application.
Wherein:
1-a current transformer;
10-a capacitor cell; 110-core groups; 111-a capacitive core; 11 a-a plug-in cavity;
120-a heat sink; 121-a cooling chamber; 122-inlet; 123-outlet;
130-insulating connectors;
140-a housing;
150-connecting sheets; 151-horizontal segment; 152-vertical section;
160-connecting terminals; 161-adaptor; 162-terminal portions;
170-fixing seat; 171-a fixed interface;
180-a first connecting line;
190-bus bar; 191-a first interface; 192-a second interface;
200-a second connecting pipeline;
210-a support frame;
20-machine side power module;
30-network side power module;
2-a cabin; a 3-generator; 4-impeller; 401-a hub; 402-leaf; 5-tower; 6-a power grid;
x-a first direction; y-row direction; z-column direction.
In the drawings, like parts are designated with like reference numerals. The figures are not drawn to scale.
Detailed Description
Features and exemplary embodiments of various aspects of the present application are 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 application. It will be apparent, however, to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by showing an example of the present application. In the drawings and the following description, at least some well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present application; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The azimuth words appearing in the following description are all directions shown in the drawings, and are not intended to limit specific structures of the capacitor cell, the converter, the wind turbine generator set and the forming method of the capacitor cell. In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected. The specific meaning of the terms in the present application can be understood as appropriate by one of ordinary skill in the art.
Referring to fig. 1 and 2, the embodiment of the present application provides a wind generating set, which may include a tower 5, a nacelle 2 disposed on the tower 5, a generator 3 connected with the nacelle 2, an impeller 4, and a converter 1 for connecting between the generator 3 and a power grid 6, wherein the impeller 4 includes a hub 401 and a plurality of blades 402 connected to the hub 401, and the impeller 4 is connected with the generator 3 through the hub 401 thereof. The impeller 4 drives the rotor of the generator 3 to rotate relative to the stator under the action of wind energy, so that the wind energy is converted into electric energy and is transmitted to the power grid 6 through the converter 1.
The converter 1 can realize the conversion of alternating current-direct current-alternating current between the wind driven generator 3 group and the power grid 6, can convert the electric energy with constantly changing voltage and frequency output by the generator 3 into constant-voltage and constant-frequency alternating current electric energy which is fed into the power grid 6, and is one of the important core components of the wind driven generator 3 group. The three-level converter 1 is commonly used in the wind driven generator 3 group at present, and uses the capacitor cell 10 to stabilize the voltage of the direct current bus, so as to prevent the direct current bus voltage from greatly fluctuating due to abrupt change of load.
As the capacity of the current transformer 1 increases, the number of standardized capacitive cores 111 of the array required for the capacitive cell 10 increases, resulting in increased difficulty in installation and maintenance as the volume of the capacitive cell 10 increases, the weight increases. Meanwhile, the large-area capacitor core 111 array adopts air cooling to dissipate heat, so that the dependence on the ambient temperature is strong, and the temperature uniformity of the capacitor core 111 is also poor. In the wind field, the environmental temperature in the converter 1 cabinet in summer is relatively high, and uneven heat dissipation is added, so that local over-temperature of individual capacitor cores 111 is most likely to occur, and the capacitor cores are invalid in advance, and the capacitor cores 111 can be attenuated under the condition of high environmental temperature after long-term operation, so that the service life is reduced, and the operation reliability of a unit is seriously affected.
In order to solve the above technical problems, the embodiment of the present application further provides a current transformer 1, where the current transformer 1 may be disposed between a generator 3 of a wind turbine 3 set and a power grid 6, and is used to implement ac-dc-ac conversion between the wind turbine 3 set and the power grid 6, so that the generator 3 of the wind turbine 3 set can input constant frequency electricity to the power grid 6.
With continued reference to fig. 2, the converter 1 includes a machine side power module 20, a network side power module 30, and a capacitor cell 10, where the machine side power module 20 is configured to convert alternating current into direct current, the network side power module 30 is configured to convert direct current into alternating current, and the capacitor cell 10 is electrically connected to the machine side power module 20 and the network side power module 30.
In order to meet the performance requirement of the converter 1, the embodiment of the application also provides a capacitor cell 10, wherein the capacitor cell 10 can stabilize the voltage of a direct current bus, and the capacitor cell 10 has good heat dissipation and can ensure the service life of a capacitor core 111.
The capacitor cell 10 provided in this embodiment includes a core group 110 and a heat sink 120, where the core group 110 includes a plurality of capacitor cores 111 sequentially arranged along a first direction X, the number of the core groups 110 is multiple groups and are arranged in an insulating manner, and a plug cavity 11a is formed between at least two groups of core groups 110. The radiator 120 is located in the insertion cavity 11a and is insulated from each core group 110, the radiator 120 has a cooling cavity 121, and an inlet 122 and an outlet 123 which are communicated with the cooling cavity 121, and the cooling liquid can enter the cooling cavity 121 through the inlet 122 and be discharged from the cooling cavity 121 through the outlet 123 after exchanging heat with the capacitor core 111.
Alternatively, the number of the core groups 110 is not particularly limited, and may be two groups, three groups, or even more. Alternatively, the number of capacitor cores 111 included in each core group 110 is not particularly limited, and may be two, three or even more, and may be specifically set according to the performance requirements of the capacitor cell 10.
In some alternative examples, the capacitive cores 111 have an axial direction and a radial direction, and the axial direction of the capacitive cores 111 may coincide with the first direction X, that is, the plurality of capacitive cores 111 of each core group 110 may be disposed sequentially along the axial direction of each capacitive core 111 itself.
Alternatively, the plurality of core groups 110 may be distributed and arranged in an insulating manner in the radial direction of the capacitor core 111. Alternatively, the insertion cavity 11a may be formed between two core groups 110 in the plurality of core groups 110, or the insertion cavity 11a may be formed by surrounding three core groups 110, four core groups 110, or more core groups 110 together, which may be specifically determined according to the arrangement manner of the plurality of core groups 110 and the appearance of the capacitor core 111.
Alternatively, the number of the plugging cavities 11a may be one, or of course, two or more, and when two or more, the two or more plugging cavities 11a are spaced apart from each other.
Optionally, the shape of the heat sinks 120 matches the shape of the plugging cavity 11a, and each heat sink 120 is located in the plugging cavity 11a and exchanges heat with the side wall surrounding the plugging cavity 11a, so that the cooling liquid can enter the cooling cavity 121 through the inlet 122 and be discharged from the cooling cavity 121 through the outlet 123 after exchanging heat with the capacitor core 111.
The capacitor cell 10 provided in the embodiment of the present application may be electrically connected to the machine side power module 20 and the network side power module 30 through the core group 110 when used in the current transformer 1. To stabilize the DC bus voltage of the converter 1 and prevent the DC bus voltage from greatly fluctuating due to abrupt change of load. Since the insertion cavity 11a is formed between at least two core groups 110, and the heat sink 120 is disposed in the insertion cavity 11a and insulated from each core group 110, the heat sink 120 has a cooling cavity 121, and an inlet 122 and an outlet 123 communicating with the cooling cavity 121, and the cooling liquid can enter the cooling cavity 121 through the inlet 122 and be discharged from the cooling cavity 121 through the outlet 123 after heat exchange with the capacitor core 111. The cooling is realized by adopting a liquid cooling mode, the heat dissipation condition of the capacitor pool 10 can be optimized, the cooling liquid with the preset temperature can be introduced as required, the influence of the gas temperature in the environment is avoided, the dependence on the environment temperature is reduced, the temperature uniformity of the capacitor core is optimized, the heat dissipation effect is good, and the service life of the capacitor pool 10 is ensured.
As an alternative implementation manner, in the capacitor cell 10 provided in this embodiment of the present application, the plugging cavity 11a is penetrated along the first direction X, the heat sink 120 is strip-shaped and matches with the shape of the plugging cavity 11a, the inlet 122 is disposed at one end of the heat sink 120 in the first direction X, and the outlet 123 is disposed at the other end of the heat sink 120 in the first direction X. Through the above arrangement, the disassembly, assembly and maintenance of the radiator 120 are facilitated, and meanwhile, the positions of the inlet 122 and the outlet 123 are arranged to facilitate the entry and the discharge of the cooling medium in the radiator 120.
Alternatively, the heat sink 120 may include a barrel body extending along the first direction X, and a cover disposed at each end of the barrel body in the first direction X and closing the barrel body, where the inlet 122 may be disposed on one of the covers, the outlet 123 may be disposed on the other cover, and the inlet 122 may be disposed opposite to each other in the first direction X, but may also be disposed at least partially offset.
In some alternative embodiments, the cross section of the cylinder body of the capacitor cell 10 in the first direction X may be a polygonal ring-shaped structure, so that each wall surface contacts one of the capacitor cores 111 and exchanges heat to facilitate cooling of the capacitor core 111.
As an alternative implementation manner, in the capacitor pool 10 provided in the embodiment of the present application, a socket cavity 11a is formed between any two core groups 110 of the multiple core groups 110, and a heat sink 120 is disposed in each socket cavity 11a. By the above arrangement, each core group 110 is brought into heat exchange with at least one heat sink 120, ensuring the cooling requirements of the respective capacitive core 111 comprised by each core group 110.
Referring to fig. 3 to 5, as an alternative implementation manner, the capacitor cell 10 provided in this embodiment of the present application further includes an insulating connector 130, and the gaps between the core groups 110 and the heat sink 120 are filled with the insulating connector 130. By providing the insulating connectors 130, insulation between adjacent core groups 110 and between each core group 110 and the corresponding heat sink 120 can be facilitated, and the risk of short-circuiting of the capacitive cell 10 during operation can be reduced.
Moreover, by providing the insulating connector 130, two adjacent core groups 110 in each core group 110 and the relative positions between the core groups 110 and the corresponding heat sinks 120 can be connected and fixed through the insulating connector 130, which is beneficial to the formation of the capacitor cell 10 and can improve the safety performance of the capacitor core 111.
Referring to fig. 3 to 6, in some alternative embodiments, the capacitor cell 10 provided in the embodiments further includes a housing 140, the core assembly 110 and the heat sinks 120 are disposed in the housing 140, and the cooling fluid flowing through at least one of the heat sinks 120 can exchange heat with the housing 140. By providing the case 140, the case 140 can protect each core block 110 and the heat sink 120 from external moisture, impurities, and the like, and can prevent the capacitor cores 111 of the core block 110 from being affected. Meanwhile, the cooling liquid flowing through the at least one radiator 120 can exchange heat with the shell 140, and the at least one radiator 120 can be utilized to assist in radiating heat to the shell 140, so that the environmental temperature condition of the core pack 110 is optimized.
When the case 140 and the insulating connector 130 are included at the same time, after fixing the relative positions of the core groups 110 and the heat sink 120, an insulating resin for forming the insulating connector 130 may be injected into the case 140 so that the insulating resin fills the gaps between the core groups 110 and the heat sink 120, and the insulating connector 130 may be formed after the insulating resin is cured. Thus, the housing 140 also facilitates the formation of the insulating connector 130, ensuring the fixing of the relative positions of the respective core groups 110 and the heat sink 120 and the insulation requirement.
Alternatively, the shape of the case 140 is not particularly limited, and may be determined according to the outer shape of the entire body of the core groups 110 and the heat sink 120 after being fixed in relative positions, and may be a polygonal box-like structure in some alternative examples, and may be a rectangular box-like structure in an example, and may be a cylindrical shape or an elliptical cylinder shape in some examples.
With continued reference to fig. 3 to 6, as an alternative implementation manner, the capacitor cell 10 provided in this embodiment of the present application further includes a connection piece 150 and a connection terminal 160, where the connection piece 150 is disposed in the housing 140, and at least two capacitor cores 111 are electrically connected through the connection piece 150, each connection piece 150 is connected to the connection terminal 160, and the connection terminal 160 is at least partially protruding from the housing 140, so that the cooling liquid flowing through the at least one heat sink 120 can exchange heat with at least one of the connection piece 150 and the connection terminal 160.
By providing the connection piece 150, at least two capacitor cores 111 can be connected in series or in parallel, and then connected with an external member through the connection terminal 160, so that the configuration can be flexibly performed, the number of interfaces is greatly reduced, and the electrical performance of the capacitor cell 10 is improved. In addition, the cooling liquid flowing through the at least one heat sink 120 can exchange heat with the connection piece 150, and can assist in cooling at least one of the connection piece 150 and the connection terminal 160 connected to the connection piece 150, thereby further optimizing the performance of the capacitor cell 10.
Alternatively, the connection piece 150 may be connected to the electrode of the capacitor core 111, and the connection piece 150 may include a vertical section 152 and a horizontal section 151 which are disposed to intersect and are connected to each other, the vertical section 152 being in contact with and electrically connected to the electrode of the capacitor core 111, and the horizontal section 151 being in contact with and electrically connected to the connection terminal 160.
Alternatively, the connection terminal 160 includes an adapter portion 161 and a terminal portion 162, the adapter portion 161 is electrically connected with the two or more connection pieces 150, alternatively, the adapter portion 161 may be a sheet-like structure and contact and electrically connected with the horizontal sections 151 of the two or more connection pieces 150. The terminal portion 162 is disposed on a surface of the adapting portion 161 facing away from the connecting piece 150 and partially protrudes from the housing 140.
Referring to fig. 3 to 7, as an alternative implementation manner, the capacitor cell 10 provided in the embodiment of the present application further includes a support frame 210, where each side of the heat sink 120 in the first direction X is connected to and supports the support frame 210. By providing the support frame 210, the support and positioning of each heat sink 120 can be facilitated.
Alternatively, when the housing 140 is included, the support frame 210 may be disposed on the housing 140 and connected to the housing 140, so that the position of the support frame 210 is fixed, and the connection between the heat sink 120 and the support frame 210 can be facilitated.
Alternatively, each support 210 may be provided with a socket that matches the shape of the heat sink 120, and the heat sink 120 may extend into the socket and be supported by the support 210.
Alternatively, the number of the supporting frames 210 may be two, or more than two, and the two supporting frames 210 may be spaced apart in the first direction X, wherein one of the supporting frames is located at one end of each heat sink 120 in the first direction X, and one of the supporting frames is located at the other end of each heat sink 120 in the first direction X.
Alternatively, the support frames 210 may be a support plate-shaped structure, and two or more support frames 210 may be spaced apart and disposed in parallel in the first direction X. At least one core group 110, optionally multiple core groups 110, may be clamped between two adjacent support frames 210, and the core groups 110 located between two adjacent support frames 210 are spaced apart in a direction intersecting the first direction X, optionally in a direction perpendicular to the first direction X.
As an alternative implementation manner, the capacitor cell 10 provided in the foregoing embodiments of the present application further includes a fixing base 170, where more than two fixing bases 170 are connected to the housing 140, and a fixing interface 171 is disposed on the fixing base 170. By arranging the fixing seat 170, the capacitor cell 10 is integrally fixed at a preset position.
In some alternative embodiments, the capacitive cell 10 provided by embodiments of the present application, when including the housing 140, may attach the anchor 170 to an outer surface of the housing 140 facing away from the core pack 110.
Alternatively, the fixing base 170 may be made of square steel, and the fixing interface 171 may be a connection hole provided on the fixing base 170.
Referring to fig. 7 and 8, as an alternative implementation, the capacitor cell 10 provided in the foregoing embodiments of the present application further includes a first connecting pipeline 180, where the inlet 122 of one of the at least two heat sinks 120 is communicated with the outlet 123 of the other heat sink through the first connecting pipeline 180. By the above arrangement, the cooling medium flowing through one of the heat sinks 120 can enter the inlet 122 of the next heat sink 120 through the first connection pipe 180 from the outlet 123 of that heat sink 120, and then exchange heat with the core group 110 or the like in contact with the next heat sink 120 and cool the corresponding core group 110.
As an alternative implementation, the capacitor cell 10 provided in this embodiment of the present application further includes a bus bar 190 and a second connection pipeline 200, where the bus bar 190 has a first interface 191 and a plurality of second interfaces 192 that communicate with the first interfaces 191, and each first interface 191 communicates with the inlet 122 or the outlet 123 through the second connection pipeline 200. By providing the bus bars 190, the cooling medium for entering each radiator 120 can be made to enter or exit through the first interface 191, facilitating the entry or recovery of the cooling liquid.
Alternatively, the number of the bus bars 190 is not particularly limited, and may be one, but may be two or more.
For example, the number of the bus bars 190 may be two, wherein the first interface 191 of one bus bar 190 communicates with the container for containing the cooling liquid and each second interface 192 communicates with the inlet 122 of one of the radiators 120, respectively, and the first interface 191 of the other bus bar 190 communicates with the container for recovering the cooling liquid after heat exchange and each second interface 192 communicates with the outlet 123 of one of the radiators 120, respectively.
As an alternative implementation, when the capacitor cell 10 provided in the embodiments of the present application includes the housing 140, the busbar 190 may be disposed inside the housing 140, and the first interface 191 may protrude from the housing 140 so as to be in communication with a container for holding the coolant.
As an alternative implementation manner, the capacitor cell 10 provided in the foregoing embodiments of the present application is provided, where the multiple groups of core groups 110 are arranged in rows and columns, at least two groups of core groups 110 of the multiple groups of core groups 110 are arranged in a row direction Y in a sequential and insulating manner, and at least two groups of core groups 110 are arranged in a column direction Z in a sequential and insulating manner, where the row direction Y, the column direction Z, and the first direction X are mutually perpendicular to each other. By adopting the arrangement mode of the capacitor cell 10, the compactness of arrangement of the core group 110 can be improved, the capacitance density of the capacitor cell 10 can be improved, and the volume of the capacitor cell 10 can be reduced. Because the volume of the capacitor pool 10 is reduced, the area and the consumption of the laminated busbar are correspondingly reduced, and the cost is reduced.
Alternatively, the number of the core groups 110 in the row direction Y and the column direction Z is not particularly limited, and two or more core groups 110 arranged in the row direction Y and the column direction Z may be the same or different. In the first direction X, the number of the core groups 110 may be one, but of course, may be two or more, and when two or more are included, two adjacent core groups 110 may share one of the supporting frames 210.
As an alternative implementation manner, in the capacitor pool 10 provided in the embodiment of the present application, each adjacent four core groups 110 of the multiple core groups 110 jointly enclose to form the plugging cavity 11a, two core groups 110 of the four core groups 110 enclosing to form the same plugging cavity 11a are distributed successively in the row direction Y, and the remaining two core groups 110 are distributed successively in the column direction Z.
According to the capacitor cell 10 provided by the embodiment of the application, the plug-in cavity 11a is formed by surrounding each adjacent four groups of core groups 110 together, the arrangement mode of the four groups of core groups 110 surrounding the same plug-in cavity 11a is limited, the heat exchange with the four core groups 110 can be realized through the same radiator 120 synchronously, the cooling of the core groups 110 is realized, the radiator 120 can be fully utilized, the heat dissipation effect is optimized, the using amount of the radiator 120 can be reduced, and the volume and the cost of the capacitor cell 10 are reduced.
As an alternative embodiment, the capacitor cell 10 provided in the embodiment of the present application may use a bare core for the capacitor core 111, and by using high-density arrangement of the capacitor cores 111, the volume of the capacitor cell 10 is reduced, the weight is reduced, the occupation of the volume in the cabinet is reduced, and the installation and maintenance difficulty is reduced.
According to the capacitor cell 10 provided by the embodiment of the application, through the mode of liquid cooling and heat dissipation of the inner integrated part of the capacitor cell 10, the heat dissipation condition of the capacitor cell 10 is improved, the temperature uniformity of each capacitor core body of the core group 110 is improved, and the service life of the capacitor cell 10 is prolonged.
Referring to fig. 3 to fig. 9 together, in another aspect, a method for forming a capacitor cell 10 is provided in the embodiment, where the method for forming a capacitor cell 10 may be used to form the capacitor cell 10 provided in the embodiment, and the method for forming a capacitor cell 10 includes:
s100, providing a plurality of capacitor cores 111, and grouping and arranging the capacitor cores 111 to form a plurality of core groups 110, wherein each core group 110 comprises a plurality of capacitor cores 111 which are sequentially arranged along a first direction X, and a splicing cavity 11a is formed between at least two core groups 110.
S200, inserting the radiator 120 into the plugging cavity 11a, where the radiator 120 has a cooling cavity 121, an inlet 122 and an outlet 123 that are in communication with the cooling cavity 121, and the cooling liquid can enter the cooling cavity 121 through the inlet 122 and be discharged through the outlet 123 after exchanging heat with the capacitor core 111.
S300, providing the shell 140, transferring the whole formed by the plurality of groups of core groups 110 and the heat sink 120 into the shell 140 and fixing the relative positions of the core groups 110 and the heat sink 120 and the shell 140.
And S400, injecting insulating resin into the shell 140, so that the insulating resin fills gaps between the core groups 110 and the radiator 120, and forming the capacitor cell 10 after the insulating resin is solidified.
Alternatively, in step S100, the number of the plurality of capacitor cores 111 arranged in groups to form the plurality of core groups 110 is not particularly limited, and may be set according to the shape requirement of the capacitor cell 10 to be formed. Alternatively, the capacitor cores 111 may be arranged in rows and columns, and may be one layer, or may be more than two layers. It is possible to form the insertion cavity 11a between at least two core groups 110, but it is also possible to form the insertion cavity 11a between every two adjacent core groups 110.
Optionally, in step S200, the heat sink 120 is inserted into the insertion cavities 11a, and the heat sink 120 may be disposed in each insertion cavity 11a, and the heat sink 120 and the adjacently disposed core groups 110 may be disposed with a gap therebetween so as to be insulated from each other with respect to the core groups 110.
Alternatively, in step S200, the capacitor core 111 may be connected in series or parallel through the connection piece 150 and the connection terminal 160, and the at least one heat sink 120 may exchange heat with at least one of the connection piece 150 and the connection terminal 160 to assist in dissipating heat to the electrical output port.
Optionally, in step S300, the housing 140 may have a closed accommodating space, and the whole formed by the plurality of groups of core groups 110 and the heat sinks 120 is transferred into the housing 140 and the relative positions of the core groups 110 and the heat sinks 120 and the housing 140 are fixed, for example, a supporting frame 210 may be connected to the housing 140, and the supporting frame 210 is connected to each heat sink 120 and the core groups 110, so that the relative positions of the core groups 110 and the heat sinks 120 and the housing 140 may be fixed.
Optionally, in step S400, the core assembly 110 and the heat sink 120 may be integrally encapsulated with an insulating resin, and the insulating resin may be cured to form the insulating connector 130 provided in the above embodiments.
The method for forming the capacitor cell 10 provided in the embodiment of the present application can be used for forming the capacitor cell 10 provided in each embodiment, and the formed capacitor cell 10 can stabilize the dc bus voltage of the converter 1, so as to prevent the dc bus voltage from greatly fluctuating due to abrupt change of load. Since the insertion cavity 11a is formed between at least two core groups 110, and the heat sink 120 is disposed in the insertion cavity 11a and insulated from each core group 110, the heat sink 120 has a cooling cavity 121, and an inlet 122 and an outlet 123 communicating with the cooling cavity 121, and the cooling liquid can enter the cooling cavity 121 through the inlet 122 and be discharged from the cooling cavity 121 through the outlet 123 after heat exchange with the capacitor core 111. The formed capacitor 10 can optimize the heat dissipation condition of the capacitor 10, reduce the dependence on the environmental temperature, and has good heat dissipation effect, thereby ensuring the service life of the capacitor 10. And, adopt the high density arrangement of electric capacity core, insulating resin embedment is insulating, has improved electric capacity density, reduces electric capacity pond 10 volume.
While the present application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (15)

1. A capacitor cell (10), comprising:
the capacitor comprises core groups (110) and a plurality of capacitor cores (111), wherein the capacitor cores (111) are sequentially arranged along a first direction (X), the core groups (110) are arranged in a plurality of groups and are insulated from each other, and a splicing cavity (11 a) is formed between at least two groups of core groups (110);
the radiator (120) is positioned in the plug-in cavity (11 a) and is arranged in an insulating mode with each core group (110), the radiator (120) is provided with a cooling cavity (121), an inlet (122) and an outlet (123) which are communicated with the cooling cavity (121), and cooling liquid can enter the cooling cavity (121) through the inlet (122) and be discharged out of the cooling cavity (121) through the outlet (123) after being subjected to heat exchange with the capacitor cores (111).
2. The capacitive cell (10) according to claim 1, wherein the plugging cavity (11 a) is penetrating along the first direction (X), the heat sink (120) is strip-shaped and matches the shape of the plugging cavity (11 a), the inlet (122) is disposed at one end of the heat sink (120) in the first direction (X), and the outlet (123) is disposed at the other end of the heat sink (120) in the first direction (X).
3. The capacitor cell (10) of claim 1, wherein the plugging cavities (11 a) are formed between any two of the plurality of core groups (110), and the heat sink (120) is disposed in each plugging cavity (11 a).
4. A capacitive cell (10) according to claim 3, characterized in that the capacitive cell (10) further comprises an insulating connector (130), the insulating connector (130) being filled in the gap between the core groups (110) and the heat sink (120).
5. A capacitive cell (10) according to claim 3, wherein the capacitive cell (10) further comprises a housing (140), the core pack (110) and the heat sinks (120) being arranged within the housing (140), the cooling fluid flowing through at least one of the heat sinks (120) being capable of heat exchanging with the housing (140).
6. The capacitive cell (10) of claim 5, wherein the capacitive cell (10) further comprises a connecting piece (150) and a connecting terminal (160), the connecting piece (150) is disposed in the housing (140) and at least two of the capacitive cores (111) are electrically connected through the connecting piece (150), each connecting piece (150) is connected with the connecting terminal (160), the connecting terminal (160) is at least partially protruding from the housing (140), and the cooling liquid flowing through at least one of the heat sinks (120) can exchange heat with at least one of the connecting piece (150) and the connecting terminal (160).
7. The capacitive cell (10) of claim 5, wherein the capacitive cell (10) further comprises a holder (170), two or more holders (170) being connected to the housing (140), the holders (170) being provided with a fixing interface (171).
8. A capacitive cell (10) according to claim 3, characterized in that the capacitive cell (10) further comprises a first connecting line (180), the inlet (122) of one of at least two of the heat sinks (120) being in communication with the outlet (123) of the other through the first connecting line (180).
9. The capacitive cell (10) according to any one of claims 1 to 8, wherein the capacitive cell (10) further comprises a busbar (190) and a second connecting line (200), the busbar (190) having a first interface (191) and a plurality of second interfaces (192) in communication with the first interfaces (191), each first interface (191) being in communication with the inlet (122) or the outlet (123) via the second connecting line (200).
10. The capacitive cell (10) according to any one of claims 1 to 8, characterized in that the capacitive cell (10) further comprises a support frame (210), the heat sink (120) being connected to and supporting the support frame (210) on each side in the first direction (X), respectively.
11. The capacitor cell (10) according to any one of claims 1 to 8, wherein a plurality of said core groups (110) are arranged in rows and columns, at least two of said core groups (110) of said plurality of core groups (110) being arranged in succession and insulated in a row direction (Y) and at least two of said core groups (110) being arranged in succession and insulated in a column direction (Z), said row direction (Y), said column direction (Z) and said first direction (X) being mutually perpendicular.
12. The capacitive cell (10) according to claim 11, characterized in that each adjacent four of the core groups (110) of the plurality of core groups (110) together enclose the plugging cavity (11 a), two of the four core groups (110) enclosing the same plugging cavity (11 a) being distributed one after the other in the row direction (Y) and the remaining two core groups (110) being distributed one after the other in the column direction (Z).
13. A current transformer (1), characterized by comprising:
a machine side power module (20) for converting alternating current into direct current;
a grid-side power module (30) for converting direct current into alternating current;
the capacitive cell (10) of any of claims 1 to 12, the capacitive cell (10) being electrically connected to the machine side power module (20) and the grid side power module (30) through the core pack (110).
14. A wind power plant, characterized by comprising a converter (1) as claimed in claim 13.
15. A method of forming a capacitor cell (10), comprising:
providing a plurality of capacitor cores (111), and grouping and arranging the plurality of capacitor cores (111) to form a plurality of core groups (110), wherein each core group (110) comprises a plurality of capacitor cores (111) which are sequentially arranged along a first direction (X), and a splicing cavity (11 a) is formed between at least two core groups (110);
-inserting a radiator (120) inside the plug-in cavity (11 a), the radiator (120) having a cooling cavity (121) and an inlet (122) and an outlet (123) communicating with the cooling cavity (121), a cooling fluid being able to enter the cooling cavity (121) through the inlet (122) and to be expelled through the outlet (123) after heat exchange with the capacitive core (111);
providing a shell (140), transferring the whole formed by a plurality of groups of core groups (110) and the heat sink (120) into the shell (140) and fixing the relative positions of the core groups (110) and the heat sink (120) and the shell (140);
and injecting insulating resin into the shell (140) so that the insulating resin fills gaps among the core groups (110) and the heat sink (120), and forming the capacitor cell (10) after the insulating resin is solidified.
CN202210079182.0A 2022-01-24 2022-01-24 Capacitor pool, converter, wind generating set and forming method of capacitor pool Pending CN116525290A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202210079182.0A CN116525290A (en) 2022-01-24 2022-01-24 Capacitor pool, converter, wind generating set and forming method of capacitor pool
PCT/CN2022/103027 WO2023137993A1 (en) 2022-01-24 2022-06-30 Capacitor bank, converter, wind generating set, and forming method for capacitor bank

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210079182.0A CN116525290A (en) 2022-01-24 2022-01-24 Capacitor pool, converter, wind generating set and forming method of capacitor pool

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Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3443312B2 (en) * 1998-03-20 2003-09-02 日産ディーゼル工業株式会社 Capacitor cooling device
CN100502629C (en) * 2007-06-22 2009-06-17 上海中上汽车科技有限公司 System for cooling and radiating super-capacity, battery and other energy-storage devices
CN101483096B (en) * 2008-11-11 2012-03-14 佛山市顺德区创格电子实业有限公司 Capacitor with high heat radiation power
CN107833747A (en) * 2017-12-22 2018-03-23 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） A kind of combined type super capacitor module radiator structure
CN213906545U (en) * 2020-12-16 2021-08-06 北京金风科创风电设备有限公司 Converter and wind generating set comprising same
CN113921273B (en) * 2021-09-18 2023-12-15 铜陵市超越电子有限公司 Metallized film capacitor for automobile

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