CN112531726A - Two-in-one power system applied to small-capacity SVG - Google Patents
Two-in-one power system applied to small-capacity SVG Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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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
- H02M1/00—Details of apparatus for conversion
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20909—Forced ventilation, e.g. on heat dissipaters coupled to components
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20927—Liquid coolant without phase change
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
A two-in-one power system applied to small-capacity SVG comprises two H-bridge modules; each H-bridge module comprises a high-voltage power supply, an IGBT unit, a module control unit, a driving plate, a driving adapter plate, a bus capacitor, a radiator, a bleeder resistor and a structural member. The IGBT unit is in a half-bridge structure and is attached to the surface of the radiator; the module control unit is an SCE board; the driving board converts the control signal into a driving pulse; the driving adapter plate is connected with the IGBT unit to drive the IGBT unit to work; the bus capacitor is a direct current bus capacitor; the module control unit and the high-voltage power supply are fixed on the structural member through insulating bolts; the driving adapter plate is connected with the IGBT unit, and the bus capacitor is connected with the IGBT unit. The SVG power density can be improved, the occupied area of equipment is reduced, the equipment cost is reduced, and meanwhile, the requirements of strong compatibility and humanized design are met.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a two-in-one power system applied to a small-capacity SVG.
Background
In recent years, with the rapid development of power electronic technology, a large number of novel loads such as flexible alternating current/direct current transmission, new energy power generation, distributed power generation, energy storage power stations, electrified rail transit, large industrial loads and the like are connected to a power grid. Reactive power compensation and harmonic suppression problems of the power grid are always concerned by various scientific research units and enterprises; static Var Generator (SVG), as a latest generation reactive power compensation device, not only has a plurality of functions of reactive power compensation, harmonic suppression, unbalance compensation, etc. but also has more superior dynamic performance compared with the traditional reactive power compensation devices such as TCR, FC, SVC, APF, etc. In practical application, a plurality of control modes are provided for users to select according to needs. Therefore, since the market is entered, each electric power consumer is rapidly favored. As a high-voltage and large-capacity power electronic device, a Static Var Generator (SVG) widely adopts an H-bridge cascaded circuit topology at present. In engineering applications, functions such as H-bridge main loop, control, heat dissipation, etc. are generally integrated and designed into a power module. Therefore, the design of the power module becomes a core technology of each large SVG design and manufacturer. However, with the continuous advancement of technology and the increasing demand of users, higher power density, smaller device footprint, and lower device cost have become the inevitable direction for the development of SVG in the present and future. The power module is used as a combined device with the largest number and the largest occupied space in the SVG, and the optimal design of the power module becomes a necessary way for the continuous development of the SVG. Therefore, the present invention provides a design scheme of a two-in-one power module applied to small-capacity SVG.
Patent CN 205792262U proposes an SVG power unit, which includes a housing, a partition board disposed in the housing, an ac input copper bar, a first group of power modules, a second group of power modules, a first dc bus bar, a second dc bus bar, a first dc bus capacitor group, a second dc bus capacitor group, an air-cooled heat sink, a power board, and an ac output copper bar; the invention is mainly suitable for the SVG of an air-cooled structure, and two groups of H-bridge modules are not insulated and isolated; patent CN 208190262U discloses an SVG power module, which includes a housing and two power units located in the housing cavity, and the two power units are horizontally arranged in parallel in the width direction in the housing cavity of the housing. In this SVG power module, two power unit have integrateed in the casing, satisfy the forced air cooling SVG needs. Most of the existing SVG power module design schemes are that a single module contains an H-bridge module, and the design is difficult to be compatible with air cooling and water cooling at the same time, the design capacity is relatively fixed, and the structure cost is relatively high; the occupied space is large in practical application and the cost is high. Patent CN 205792262U and patent CN 208190262U, although each propose a design scheme that includes two H-bridge modules in a single power module, are only suitable for air-cooled SVG according to their content descriptions; two H-bridge modules in a power module designed in a patent CN 205792262U are not subjected to effective electrical isolation, and the stability of the operation of the modules is difficult to ensure in high-voltage SVG application occasions; the direct current buses in the two patents adopt the design of the laminated bus, so that the cost of the module is greatly increased, and the economical efficiency of practical application is influenced; there are few designs for module compatibility and human friendliness in the above two patents.
Disclosure of Invention
In order to solve the problems, the invention provides a two-in-one power system applied to the small-capacity SVG, which improves the power density of the SVG, reduces the occupied area of equipment, reduces the cost of the equipment, and simultaneously meets the requirements of strong compatibility and humanized design.
The invention discloses a two-in-one power system applied to a small-capacity SVG (static var generator), which comprises two H-bridge modules; each H-bridge module comprises a high-voltage power supply, an IGBT unit, a module control unit, a driving plate, a driving adapter plate, a bus capacitor, a radiator, a bleeder resistor and a structural member;
the IGBT unit is of a half-bridge structure and is attached to the surface of the radiator;
the module control unit is an SCE board;
the driving board converts the control signal into a driving pulse;
the driving adapter plate is connected with the IGBT unit and drives the IGBT unit to work;
the bus capacitor is a direct current bus capacitor;
the module control unit and the high-voltage power supply are fixed on the structural member through insulating bolts;
the driving adapter plate is connected with the IGBT unit, and the bus capacitor is connected with the IGBT unit.
Further, the frame of the power system is made of a composite insulating plate and an aluminum-plated zinc plate in a mixed mode.
Further, the H-bridge module comprises a main circuit, and each H-bridge module comprises two half-bridge IGBT units.
Furthermore, the two H-bridge modules are arranged in an up-and-down stacked mode.
Furthermore, the two H-bridge modules are respectively a first H-bridge module and a second H-bridge module, and an alternating current input copper bar of the first H-bridge module is arranged at the upper position of the front side of the first H-bridge module so as to be conveniently cascaded with the output of the previous H-bridge module; and an alternating current output copper bar of the second H-bridge module is arranged at the position of the lower part of the second H-bridge module, so that the alternating current output copper bar is conveniently cascaded with the input of the next module.
Furthermore, the alternating current output of the first H-bridge module and the alternating current input of the second H-bridge module are cascaded inside the modules through copper bars.
Furthermore, the front and the back of the H-bridge power system adopt composite insulating plates, and aluminum-plated zinc plates are adopted at other positions.
Furthermore, the radiator adopts two heat dissipation modes of air cooling and water cooling.
Furthermore, the SVG is a three-phase system, and each phase of the SVG is formed by cascading a plurality of H-bridge modules to form a multilevel inverter.
The technical scheme of the invention comprises the following beneficial technical effects:
(1) the power density of the module is greatly improved. The invention reduces the volume of the power module to 50% of that of the conventional SVG power module, thereby effectively improving the power density of the module; and a feasible solution is provided for further improving the power density of the SVG complete equipment, and reducing the equipment volume and the field occupied area.
(2) By adopting compatible design, the invention fully considers the change of the market demand of the current SVG and adopts various compatible designs on the design level of the power module; firstly, a direct current bus capacitor can be flexibly configured according to the SVG capacity; secondly, IGBT modules with different specifications can be compatibly installed; thirdly, the radiator can adopt two radiating modes of air cooling and water cooling. The air-cooled/water-cooled SVG can meet the requirements of 0.5-2.5 MVar under the voltage level of 10kV and 1.75 MVar-8.75 MVar under the voltage level of 35 kV.
(3) The direct-current busbar is designed with low cost, the direct-current busbar is designed with a simple laminated busbar design scheme, the cost of the power module is effectively reduced, and the technical performance completely meets the index requirement.
(4) The power module is designed in a manner of fully considering the convenience of maintenance and replacement, and a plug-in design mode is adopted, so that slide rails, plug pins, handles and the like which are convenient for plugging and unplugging the module are added; the module design is not only reliable in performance on the whole, but also the design is more humanized.
Drawings
FIG. 1 is a schematic diagram of a two-in-one power system according to the present invention;
FIG. 2 is a front view of a two-in-one power system of the present invention;
FIG. 3 is a left side view of the two-in-one power system of the present invention;
FIG. 4 is a right side view of the two-in-one power system of the present invention;
FIG. 5 is a top view of the two-in-one power system of the present invention.
1. An IGBT; 2. a drive plate; 3. a drive adapter plate; 4. an SCE board; 5. a first mounting plate; 6. a second mounting plate; 7. a first mounting frame plate; 8. a second mounting frame plate; 9. a guide post; 10. a third mounting plate; 11. a fourth mounting plate; 12. a fifth mounting plate; 13. a first copper bar; 14. a heat sink; 15. a second copper bar; 16. a third copper bar; 17. a fourth copper bar; 18. a fifth copper bar; 19. a sixth copper bar; 20. a first insulating plate; 21. a second insulating plate; 22. a third insulating plate; 23. a fourth insulating plate; 24. a fifth insulating plate; 25. a sixth insulating plate; 26. a bus capacitor; 27. a thermistor; 28. a nut; 29. a socket head cap screw; 30. a first cross countersunk head screw; 31. a second cross countersunk head screw; 32. a thirty-first countersunk head screw; 33. supporting a cable; 34. a first insulating support; 35. a second insulating support; 36. a handle; 37. a sealing strip; 38. a resistance; 39. power panel
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The invention provides a two-in-one power system applied to a small-capacity Static Var Generator (SVG). As shown in fig. 1, the two-in-one H-bridge power system of the present invention includes two H-bridge modules, which are a first H-bridge module and a second H-bridge module, respectively, and the two H-bridge modules are cascaded and arranged in an up-down stacking manner. The first H-bridge module and the second H-bridge module respectively comprise a high-voltage power supply, an IGBT unit, a module control unit, a driving adapter plate, a bus capacitor, a radiator, a bleeder resistor and a structural member, wherein the bus capacitor is a direct-current bus capacitor, the module control unit is an SCE plate, and a frame of a power system is made by mixing a composite insulating plate and an aluminum-plated zinc plate, so that the requirements of electrical isolation and mechanical strength are met. The invention provides a feasible scheme for the design of the small-capacity compact SVG power unit.
As shown in fig. 2, it can be seen from the front view of the power system that each H-bridge module further includes: the device comprises a heat dissipation channel, an insulating panel, a handle, an optical fiber socket and an SCE board software downloading interface.
As shown in fig. 3, the left side view of the power system shows that the SCE board and the high voltage power supply are secured to the structural members of the power system by insulated bolts.
As shown in fig. 4, as seen from the right view of the power system, the first H-bridge module and the second H-bridge module each include a main circuit, and each H-bridge module includes two IGBT units in a half-bridge structure; the IGBT unit is attached to the surface of the radiator, the driving adapter plate is connected with the IGBT unit through tin soldering, and the IGBT unit is connected with the bus capacitor through simple overlapping.
As shown in fig. 5, the power system top view can be seen, and includes two IGBT driver boards and a plug for plugging and unplugging the module.
The drive board converts control signal into drive pulse, and the drive keysets is connected with IGBT direct connection, drives IGBT work.
When the first H-bridge module and the second H-bridge module are integrally designed, two independent radiators and heat dissipation channels are adopted. When the module selects air cooling, the front side of the module is an air inlet, and the back side of the module is an air outlet; when the module selects water cooling, the water inlet and outlet pipes of the module are all installed on the front side.
Two cascaded H-bridge modules in each H-bridge power module are arranged in an up-and-down stacking mode. The alternating current input copper bar of the first H-bridge module is arranged at the upper position of the front side of the first H-bridge module, so that the alternating current input copper bar is conveniently cascaded with the output of the previous module; an alternating current output copper bar of the second H-bridge module is arranged at the lower part of the second H-bridge module, so that the alternating current output copper bar is conveniently cascaded with the input of the next module; the alternating current output of the first H-bridge module and the alternating current input of the second H-bridge module in each H-bridge module are cascaded inside the modules through copper bars.
Specifically, the front and the back of the H-bridge power system are provided with composite insulating plates, and aluminum-plated zinc plates are arranged at other positions to meet the requirements of electrical isolation of the first H-bridge module and the second H-bridge module and the overall mechanical strength of the modules.
The two H-bridge module devices adopt the same structural layout. From the module front view, mainly be two heat dissipation channels and the external secondary interface of alternating current side business turn over copper bar, module handle and module from last to bottom. And viewed from the left side of the module, the SCE plate and the high-voltage power supply are sequentially arranged from front to back, and the devices are fixed on the module structural member through insulating bolts. Viewed from the right side of the module, a radiator, an IGBT, a driving adapter plate, a capacitor and a bus copper bar are respectively arranged from front to back; wherein the IGBT is fixed on the radiator panel, and the driving adapter plate is connected with the IGBT through tin soldering. The bus copper bars are stacked and installed, and the installation quantity of the capacitors can be matched according to the capacity of the SVG. Overlook from the top of the module, be two IGBT drive boards, aluminum hull resistance, bus copper bar and electric capacity respectively from the front to the back. From the front view of the back of the module, the air outlets of the two heat dissipation channels, the bolt for plugging and unplugging the module and the slide rail are respectively arranged from top to bottom.
Specifically, the power module adopts multiple design concurrently, and direct current bus capacitance can dispose according to the SVG capacity is nimble, but the compatible IGBT of installing different specifications, and the radiator can adopt two kinds of heat dissipation modes of forced air cooling and water-cooling. The air-cooled/water-cooled SVG can meet the requirements of 0.5-2.5 MVar under the voltage level of 10kV and 1.75 MVar-8.75 MVar under the voltage level of 35 kV.
Specifically, two H-bridge modules are cascaded as a circuit topology of the Static Var Generator (SVG) of the present invention. The main circuit connection mode can be star connection or triangular connection, the SVG is a three-phase system, and each phase of the SVG is formed by cascading a plurality of H-bridge modules to form a multi-level inverter.
In the operation process of the SVG, when the capacitance voltage of the H-bridge module is Udc, a single H-bridge module outputs three levels of Udc, -Udc and 0, and each phase of output voltage is formed by overlapping the voltages output by a plurality of H-bridge modules, so that if each phase of output voltage is formed by overlapping the voltages output by N H-bridge modules, each phase can output 2N +1 levels from-NUdc to NUdc. The output voltage of the SVG side can be controlled by controlling the superposed voltage output by the H bridge module, and inductive or capacitive reactive power exchange is carried out between the SVG side and a power grid through the reactor, so that the problems of large number of H bridge units, large occupied space, high cost, low stability and the like are solved.
Specifically, the power module direct-current busbar is designed with low cost. The direct-current busbar design adopts a simple laminated busbar design scheme, so that the cost of the power module is effectively reduced, and the technical performance completely meets the index requirement.
Specifically, the power module is designed in a manner of plug-in design by fully considering convenience of maintenance and replacement, and sliding rails, pins, handles and the like which are required by the module to be plugged are added; the module design is not only reliable in performance on the whole, but also the design is more humanized.
In summary, the present invention provides a two-in-one power system applied to small-capacity SVG, where the power system includes two H-bridge modules; each H-bridge module comprises a high-voltage power supply, an IGBT unit, a module control unit, a driving plate, a driving adapter plate, a bus capacitor, a radiator, a bleeder resistor and a structural member. The IGBT unit is in a half-bridge structure and is attached to the surface of the radiator; the module control unit is an SCE board; the driving board converts the control signal into a driving pulse; the driving adapter plate is connected with the IGBT unit to drive the IGBT unit to work; the bus capacitor is a direct current bus capacitor; the module control unit and the high-voltage power supply are fixed on the structural member through insulating bolts; the driving adapter plate is connected with the IGBT unit, and the bus capacitor is connected with the IGBT unit. The SVG power density can be improved, the occupied area of equipment is reduced, the equipment cost is reduced, and meanwhile, the requirements of strong compatibility and humanized design are met.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (9)
1. A two-in-one power system applied to small-capacity SVG is characterized in that the power system comprises two H-bridge modules; each H-bridge module comprises a high-voltage power supply, an IGBT unit, a module control unit, a driving plate, a driving adapter plate, a bus capacitor, a radiator, a bleeder resistor and a structural member;
the IGBT unit is of a half-bridge structure and is attached to the surface of the radiator;
the module control unit is an SCE board;
the driving board converts the control signal into a driving pulse;
the driving adapter plate is connected with the IGBT unit and drives the IGBT unit to work;
the bus capacitor is a direct current bus capacitor;
the module control unit and the high-voltage power supply are fixed on the structural member through insulating bolts;
the driving adapter plate is connected with the IGBT unit, and the bus capacitor is connected with the IGBT unit.
2. The power system of claim 1, wherein the frame of the power system is made of a composite insulating sheet mixed with an aluminized zinc sheet.
3. The power system of claim 2, wherein the H-bridge modules comprise a main circuit, each H-bridge module comprising two half-bridge configured IGBT-cells.
4. The power system of claim 3, wherein two of said H-bridge modules are arranged one above the other.
5. The power system of claim 4, wherein said two H-bridge modules are a first H-bridge module and a second H-bridge module, respectively, the AC input copper bar of the first H-bridge module being disposed at an upper position of the front face of the first H-bridge module for facilitating cascading with the output of the previous module; and an alternating current output copper bar of the second H-bridge module is arranged at the position of the lower part of the second H-bridge module, so that the alternating current output copper bar is conveniently cascaded with the input of the next module.
6. The power system of claim 5, wherein the ac output of the first H-bridge module is cascaded with the ac input of the second H-bridge module via copper traces within the modules.
7. The power system of claim 6, wherein the H-bridge power system uses composite insulating panels on the front and back, and aluminized zinc panels elsewhere.
8. The power system of claim 7, wherein the heat sink employs both air-cooling and water-cooling.
9. The power system of claim 8, wherein the SVG is a three-phase system, each phase of the SVG being a multilevel inverter formed from a cascade of a plurality of H-bridge modules.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011348259.7A CN112531726A (en) | 2020-11-26 | 2020-11-26 | Two-in-one power system applied to small-capacity SVG |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011348259.7A CN112531726A (en) | 2020-11-26 | 2020-11-26 | Two-in-one power system applied to small-capacity SVG |
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| CN112531726A true CN112531726A (en) | 2021-03-19 |
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2020
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| WO2013060127A1 (en) * | 2011-10-27 | 2013-05-02 | 荣信电力电子股份有限公司 | Integrated intensive svg cabinet based on multi-unit integrated drawer type power module |
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| CN106329952A (en) * | 2016-08-31 | 2017-01-11 | 浙江海得新能源有限公司 | Power module |
| CN106385181A (en) * | 2016-09-21 | 2017-02-08 | 国电南瑞科技股份有限公司 | Series IGBT (Insulated Gate Bipolar Transistor) module device-based H-bridge assembly |
| CN111614103A (en) * | 2020-06-10 | 2020-09-01 | 新风光电子科技股份有限公司 | Indoor wall-mounted small-size high-voltage dynamic reactive power compensation device |
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Application publication date: 20210319 |