CN113037101B - High-frequency matrix type light-weight totally-enclosed high-voltage frequency conversion device - Google Patents
High-frequency matrix type light-weight totally-enclosed high-voltage frequency conversion device Download PDFInfo
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- CN113037101B CN113037101B CN202110537937.2A CN202110537937A CN113037101B CN 113037101 B CN113037101 B CN 113037101B CN 202110537937 A CN202110537937 A CN 202110537937A CN 113037101 B CN113037101 B CN 113037101B
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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
- 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
- H02M5/02—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 without intermediate conversion into dc
- H02M5/04—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 without intermediate conversion into dc by static converters
- H02M5/22—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 without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/275—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 without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/293—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 without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1216—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for AC-AC converters
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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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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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
- H05K7/14—Mounting supporting structure in casing or on frame or rack
- H05K7/1422—Printed circuit boards receptacles, e.g. stacked structures, electronic circuit modules or box like frames
- H05K7/1427—Housings
- H05K7/1432—Housings specially adapted for power drive units or power converters
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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
- H05K7/20945—Thermal management, e.g. inverter temperature control
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Inverter Devices (AREA)
- Ac-Ac Conversion (AREA)
- Power Conversion In General (AREA)
Abstract
The invention discloses a high-frequency matrix type light-weight totally-enclosed high-voltage frequency conversion device which comprises a high-voltage power supply connected with the input side of a power grid, wherein the high-voltage power supply is sequentially and electrically connected with an input protection unit, an input filtering unit, a frequency conversion unit and a main controller through cables, the output end of the frequency conversion unit is also sequentially and electrically connected with an output filtering unit and an output protection unit through cables, the output protection unit is electrically connected with the output side of a high-voltage motor through cables, and the main controller is also electrically connected with a heat dissipation unit through cables. The high-frequency matrix type light-weight totally-enclosed high-voltage frequency conversion device saves a rectifying unit, uses a small amount of high-frequency IGBTs, and obviously reduces the cost; the system directly bears high voltage, a structure without a transformer is realized, transformer loss is eliminated, and the system efficiency is greatly improved; the container type skid-mounted is realized, and the single skid transportation requirement is met; the structure is a totally-enclosed self-circulation heat dissipation form, so that the influence of external pollutants on the device is reduced, and the safety and reliability are improved.
Description
Technical Field
The invention belongs to the technical field of automatic control devices, and relates to a high-frequency matrix type light-weight totally-enclosed high-voltage frequency conversion device.
Background
The variable-frequency driving device is widely applied to the control field of various engineering machinery in the industries of metallurgy, petroleum and the like, can effectively improve the process level and the product quality, reduce the impact and the noise of equipment, save energy, reduce emission, prolong the service life of the equipment, simplify the system, facilitate the operation and the control and improve the performance of the whole product.
In recent years, the demand of high-voltage and high-power driving systems is continuously increased, the number of IGBT insulated gate bipolar transistors under high voltage level is small, the cost is high, the traditional medium-high voltage transmission system adopts an AC-DC-AC frequency topology structure, the number of IGBTs is large, and a large capacitor and a transformer are needed on the DC side, so the manufacturing cost is high, the volume is large, and the efficiency is low.
The classical matrix converter is a single-pole power converter, converts three-phase alternating current with fixed voltage and frequency into three-phase alternating current with variable voltage and frequency, and because of the lack of switching devices with high enough current and voltage grade, the classical matrix converter can not be directly used in a medium-high voltage transmission system, and the traditional thyristor type matrix converter is difficult to reach the high-frequency performance of the IGBT, but the cost is high due to the use of a large number of IGBTs, and the problems of installation performance, heat dissipation performance and the like are all needed to be solved urgently.
Disclosure of Invention
The invention aims to provide a high-frequency matrix type light-weight totally-enclosed high-voltage frequency conversion device, which solves the problems that a silicon controlled matrix converter in the prior art is difficult to achieve the high-frequency performance of an IGBT (insulated gate bipolar translator), and the cost is high when a large number of IGBTs are used.
The technical scheme adopted by the invention is that the high-frequency matrix type light-weight totally-enclosed high-voltage frequency conversion device comprises a high-voltage power supply connected with the input side of a power grid, wherein the high-voltage power supply is sequentially and electrically connected with an input protection unit, an input filtering unit, a frequency conversion unit and a main controller through cables, the output end of the frequency conversion unit is also sequentially and electrically connected with an output filtering unit and an output protection unit through cables, the output protection unit is electrically connected with the output side of a high-voltage motor through cables, and the main controller is also electrically connected with a heat dissipation unit through cables.
The present invention is also characterized in that,
the heat dissipation unit is connected with an external auxiliary power supply.
The high-voltage power supply comprises a 10kVA three-phase alternating-current high-voltage electric switch which is electrically connected with a 10kV power grid side, the three phases are A, B, C three phases respectively, and A, B, C three phases are electrically connected with the input protection unit through cables.
The input protection unit is including being provided with three groups of contactors side by side, and three groups of contactors are connected the A, B, C three-phase that corresponds high voltage power supply respectively through the cable electricity, and the contactor other end is connected with the fuse through the cable electricity, and the other end of three groups of fuses is connected with the input filter unit through the cable electricity.
The input filtering unit comprises three groups of filters arranged in parallel, the three groups of filters are respectively and correspondingly electrically connected with three groups of fuses, and the other ends of the three groups of filters are electrically connected with the frequency conversion unit.
The frequency conversion unit comprises nine same integrated modules which are arranged in parallel, the integrated modules are respectively marked as an integrated module a, an integrated module B, an integrated module C, an integrated module d, an integrated module e, an integrated module f, an integrated module g, an integrated module h and an integrated module i, a filter corresponding to a high-voltage power supply A is electrically connected with the integrated module C, the integrated module f and the integrated module i through cables, a filter corresponding to a high-voltage power supply B is electrically connected with the integrated module B, the integrated module e and the integrated module h through cables, a filter corresponding to a high-voltage power supply C is electrically connected with the integrated module a, the integrated module d and the integrated module g through cables, and the nine integrated modules are electrically connected with the main controller through optical fibers.
Each integrated module consists of eight anti-series IGBT sub-modules, a first IGBT sub-module of the eight anti-series IGBT sub-modules is connected with a corresponding filter, and an eighth IGBT sub-module of the eight anti-series IGBT sub-modules is connected with an output filtering unit.
The output filtering unit comprises three groups of filters a arranged in parallel, an integrated module a, an integrated module B, the other end of the integrated module C is connected with a first group of filters a as an output A after being converged to a cable through a cable, the other end of the integrated module d, the other end of the integrated module e and the other end of the integrated module f are converged to a cable through a cable and connected with a second group of filters a as an output B, the other end of the integrated module g, the integrated module h and the other end of the integrated module i are converged to a cable through a cable and connected with a third group of filters a as an output C, and the other ends of the three groups of filters a are connected with an output protection unit through cables.
The output protection unit comprises three groups of contactors a arranged in parallel, the three groups of contactors a are respectively connected with the three groups of filters a through cables, and the three groups of contactors a corresponding to the output A, B, C are respectively and correspondingly connected with three phases on the output side of the high-voltage motor.
The high-voltage power supply, the input protection unit, the input filter unit, the frequency conversion unit, the main controller, the output filter unit, the output protection unit and the heat dissipation unit are all arranged in the container, the heat dissipation unit comprises an air conditioner and an internal circulation fan which are arranged in the container, and the air conditioner and the internal circulation fan are all electrically connected with an external auxiliary power supply and the main controller.
The invention has the beneficial effects that:
according to the invention, an AC-AC matrix type topological structure is adopted, a DC link is saved, a high-frequency IGBT insulated gate bipolar transistor is adopted, the high-frequency controllability of a system is met, the number of the used IGBTs is small, and the production cost is reduced; the device is in a container skid-mounted mode, adopts a fully-closed self-circulation heat dissipation integration design, is high in transportability, and the frequency conversion unit can output any driving voltage value lower than the input voltage, so that the applicability is high; the device adopts the totally enclosed structural design, has reduced the air exchange of frequency conversion device with external environment, and pollutants such as external environment dust and harmful gas are less to the influence of device, have improved whole electrical equipment's fail safe nature.
Drawings
FIG. 1 is a block diagram of the high-frequency matrix type light-weight totally-enclosed high-voltage frequency conversion device;
FIG. 2 is a schematic diagram of an electrical driving circuit of the high-frequency matrix type light-weight totally-enclosed high-voltage frequency conversion device;
FIG. 3 is a schematic front view of the structure of a high-frequency matrix type light-weight totally-enclosed high-voltage frequency conversion device of the present invention;
FIG. 4 is a schematic rear view of the structure of the high-frequency matrix type light-weight totally-enclosed high-voltage frequency conversion device of the present invention;
fig. 5 is a perspective view of a high-frequency matrix type light-weight totally-enclosed high-voltage inverter according to the present invention.
In the figure, 1, a high-voltage power supply, 2, an input protection unit, 3, an input filtering unit, 4, a frequency conversion unit, 5, a main controller, 6, an output filtering unit, 7, an output protection unit, 8, a heat dissipation unit, 9, an external auxiliary power supply and 10, a container;
2-1, a contactor, 2-2, a fuse; 3-1. a filter; 4-1. integrating the module; 6-1, filter a, 7-1 and contactor a.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention discloses a high-frequency matrix type light-weight totally-enclosed high-voltage frequency conversion device which comprises a high-voltage power supply 1 connected with the input side of a power grid, wherein the high-voltage power supply 1 is sequentially and electrically connected with an input protection unit 2, an input filtering unit 3, a frequency conversion unit 4 and a main controller 5 through cables, the output end of the frequency conversion unit 4 is also sequentially and electrically connected with an output filtering unit 6 and an output protection unit 7 through cables, the output protection unit 7 is electrically connected with the output side of a high-voltage motor through cables, and the main controller 5 is also electrically connected with a heat dissipation unit 8 through cables.
The heat radiating unit 8 is connected with an external auxiliary power supply 9.
The high-voltage power supply 1 comprises a 10kVA three-phase alternating-current high-voltage switch which is electrically connected with a 10kV power grid side, wherein the three phases are A, B, C three phases respectively, and A, B, C three phases are electrically connected with the input protection unit 2 through cables.
The input protection unit 2 comprises three groups of contactors 2-1 which are arranged in parallel, the three groups of contactors 2-1 are respectively and electrically connected with A, B, C three phases corresponding to the high-voltage power supply 1 through cables, the other ends of the contactors 2-1 are electrically connected with fuses 2-2 through cables, and the other ends of the three groups of fuses 2-2 are electrically connected with the input filtering unit 3 through cables.
The input filtering unit 3 comprises three groups of filters 3-1 which are arranged in parallel, the three groups of filters 3-1 are respectively and correspondingly electrically connected with three groups of fuses 2-2, and the other ends of the three groups of filters 3-1 are electrically connected with the frequency conversion unit 4.
The frequency conversion unit 4 comprises nine same integrated modules 4-1 which are arranged in parallel and respectively marked as an integrated module a, an integrated module B, an integrated module C, an integrated module d, an integrated module e, an integrated module f, an integrated module g, an integrated module h and an integrated module i, a filter 3-1 corresponding to the high-voltage power supply 1A is respectively and electrically connected with the integrated module C, the integrated module f and the integrated module i through cables, a filter 3-1 corresponding to the high-voltage power supply 1B is respectively and electrically connected with the integrated module B, the integrated module e and the integrated module h through cables, a filter 3-1 corresponding to the high-voltage power supply 1C is respectively and electrically connected with the integrated module a, the integrated module d and the integrated module g through cables, and the nine integrated modules 4-1 are electrically connected with the main controller 5 through optical fibers.
Each integrated module 4-1 consists of eight anti-series IGBT sub-modules, a first IGBT sub-module of the eight anti-series IGBT sub-modules is connected with the corresponding filter 3-1, and an eighth IGBT sub-module of the eight anti-series IGBT sub-modules is connected with the output filtering unit 6.
The output filtering unit 6 comprises three groups of filters a6-1 arranged in parallel, the other ends of an integrated module a, an integrated module B and an integrated module C are converged to one cable through cables and then connected with a first group of filters a6-1 as output A, the other ends of an integrated module d, an integrated module e and an integrated module f are converged to one cable through cables and connected with a second group of filters a6-1 as output B, the other ends of an integrated module g, an integrated module h and an integrated module i are converged to one cable through cables and connected with a third group of filters a6-1 as output C, and the other ends of the three groups of filters a6-1 are connected with the output protection unit 7 through cables.
The output protection unit 7 comprises three groups of contactors a7-1 arranged in parallel, the three groups of contactors a7-1 are respectively connected with the three groups of filters a6-1 through cables, and the three groups of contactors a7-1 corresponding to the output A, B, C are respectively correspondingly connected with three phases at the output side of the high-voltage motor.
Still include container 10, high voltage power supply 1, input protection unit 2, input filter unit 3, frequency conversion unit 4, main control unit 5, output filter unit 6 and output protection unit 7 and radiating element 8 all set up in container 10, and radiating element 8 is including setting up air conditioner and the inside circulation fan in container 10, and air conditioner and inside circulation fan all are connected with outside auxiliary power source 9 and main control unit 5 electricity.
The frequency conversion unit 4 comprises nine integrated modules 4-1, each integrated module is composed of eight anti-series IGBT sub-modules, and a frequency conversion driving system which takes a low-voltage high-frequency IGBT as a basic composition unit and meets the application requirement of a high-voltage occasion is formed.
The main controller 5 of the invention is an embedded single board computer with low power consumption ARM as a core chip, is connected with the frequency conversion unit 4 through high-speed optical fiber transmission, loads a PWM (pulse-width modulation) duty ratio algorithm program and is respectively connected with the integrated modules a-i through optical fibers.
The invention adopts a fully-closed self-circulation heat dissipation container type skid-mounted structure, reduces the air exchange between the frequency converter and the external environment, has little influence on the device by pollutants such as external environment dust, harmful gas and the like, and greatly reduces the potential safety hazard caused by the influence on the creepage performance of equipment due to the fact that high-voltage devices are easy to adsorb dust.
The voltage of the output side of the invention is (0-10) kVA arbitrary voltage value; the heat dissipation unit 8 contains air conditioner and inside circulation fan, via outside auxiliary power supply, and heat dissipation unit 8 links to each other with main control unit 5, loads into the control by temperature change procedure in the main control unit 5, monitors the inside room temperature of container 10, starts air conditioner and inside circulation fan in good time, reaches the indoor quick constant temperature control of container.
The real-time process of the invention is as follows:
as shown in fig. 1-5, after power-on, all hardware is checked, if the device is abnormal during testing, the input protection unit 2 and the output protection unit 7 can be cut off at the same time, so that the frequency conversion device is in a safe maintenance independent state, the indication element display of each device is ensured to be normal, and if the frequency conversion device is in combined operation, the frequency conversion device is communicated and debugged with other equipment through the main controller 5, and the network communication among the equipment is ensured to be smooth.
The 10kVA high-voltage electricity at the power grid side is transmitted to a frequency conversion device through a high-voltage power supply 1, the current enters three groups of contactors 2-1 in an input protection unit 2 through the closing of a high-voltage disconnecting link to carry out undervoltage or voltage loss protection, and the three groups of contactors 2-1 are further connected with a fuse 2-2 to carry out short-circuit overcurrent protection; the invention is a matrix alternating-alternating frequency framework, can operate in four quadrants, and has bidirectional current flow direction.
After the system is normally started, current flows into three filters 3-1 of an input filtering unit 3 to respectively carry out filtering of each phase, the filters are filter circuits consisting of capacitors and inductors, frequency points of specific frequency in a power line or frequencies except the frequency points are effectively filtered, pure high-voltage current enters a frequency conversion unit 4, integrated modules of the frequency conversion unit 4 are connected in series through low-voltage IGBT (insulated gate bipolar translator) sub-modules, the high-voltage current is directly input after being filtered, and is directly output after being filtered, and data interaction is carried out between a main controller and the frequency conversion unit by adopting high-speed optical fiber anti-interference signals.
The main controller 5 is started by an external auxiliary power supply, scans the communication state after initialization setting, and after ensuring stable and normal communication, outputs instructions to the integrated modules a-i of the frequency conversion unit 4 through an optical fiber network according to preset frequency conversion algorithm software, programs perform chopping control through a duty ratio PWM (pulse width modulation) algorithm, the IGBT adopts an insulated gate bipolar transistor element with 4500V voltage level, and can output voltage arbitrarily lower than 10kV through inverse series connection and cascade connection, and the modulated voltage enters the output filtering unit 6.
The output filter unit 6 filters out the frequency point of the specific frequency or the frequency other than the frequency point, the voltage further enters the contactor a7-1 of the output protection unit 7, and the contactor can control the on-off of the rear external high-voltage motor.
When the device normally operates, the temperature control program in the main controller 5 automatically monitors the room temperature in the container internal space of the device, starts the air conditioner and the internal circulation fan of the heat dissipation unit 8 in due time, circulates the internal air quickly and realizes the indoor constant temperature control of the container.
The output voltage of the device is connected with an external high-voltage alternating-current variable-frequency motor through a high-voltage motor output side terminal, so that variable-frequency transmission driving is performed.
Claims (1)
1. The high-frequency matrix type light-weight totally-enclosed high-voltage frequency conversion device is characterized by comprising a high-voltage power supply (1) connected with the input side of a power grid, wherein the high-voltage power supply (1) is electrically connected with an input protection unit (2), an input filtering unit (3), a frequency conversion unit (4) and a main controller (5) in sequence through cables, the output end of the frequency conversion unit (4) is further electrically connected with an output filtering unit (6) and an output protection unit (7) in sequence through cables, the output protection unit (7) is electrically connected with the output side of the high-voltage motor through cables, and the main controller (5) is further electrically connected with a heat dissipation unit (8) through cables;
the heat dissipation unit (8) is connected with an external auxiliary power supply (9);
the high-voltage power supply (1) comprises a 10kVA three-phase alternating-current high-voltage electric switch which is electrically connected with a 10kV power grid side, wherein the three phases are A, B, C three phases respectively, and A, B, C three phases are electrically connected with the input protection unit (2) through cables;
the input protection unit (2) comprises three groups of contactors (2-1) which are arranged in parallel, the three groups of contactors (2-1) are electrically connected with A, B, C three phases corresponding to the high-voltage power supply (1) through cables respectively, the other ends of the contactors (2-1) are electrically connected with fuses (2-2) through cables, and the other ends of the three groups of fuses (2-2) are electrically connected with the input filtering unit (3) through cables;
the input filtering unit (3) comprises three groups of filters (3-1) which are arranged in parallel, the three groups of filters (3-1) are respectively and correspondingly electrically connected with the three groups of fuses (2-2), and the other ends of the three groups of filters (3-1) are electrically connected with the frequency conversion unit (4);
the frequency conversion unit (4) comprises nine integrated modules (4-1) which are arranged in parallel and are respectively marked as an integrated module a, an integrated module b, an integrated module c, an integrated module d, an integrated module e, an integrated module f, an integrated module g, an integrated module h and an integrated module i, the filter (3-1) corresponding to the high-voltage power supply (1) A is respectively and electrically connected with the integrated module c, the integrated module f and the integrated module i through cables, the filter (3-1) corresponding to the high-voltage power supply (1) B is respectively and electrically connected with the integrated module B, the integrated module e and the integrated module h through cables, the filter (3-1) corresponding to the high-voltage power supply (1) C is electrically connected with the integrated module a, the integrated module d and the integrated module g through cables, and the nine integrated modules (4-1) are electrically connected with the main controller (5) through optical fibers;
each integrated module (4-1) consists of eight anti-series IGBT sub-modules, a first IGBT sub-module of the eight anti-series IGBT sub-modules is connected with a corresponding filter (3-1), and an eighth IGBT sub-module of the eight anti-series IGBT sub-modules is connected with an output filtering unit (6);
the output filtering unit (6) comprises three groups of filters a (6-1) which are arranged in parallel, the other ends of the integrated module a, the integrated module B and the integrated module C are converged to one cable through cables and then are connected with a first group of filters a (6-1) as output A, the other ends of the integrated module d, the integrated module e and the integrated module f are converged to one cable through cables and are connected with a second group of filters a (6-1) as output B, the other ends of the integrated module g, the integrated module h and the integrated module i are converged to one cable through cables and are connected with a third group of filters a (6-1) as output C, and the other ends of the three groups of filters a (6-1) are connected with the output protection unit (7) through cables;
the output protection unit (7) comprises three groups of contactors a (7-1) which are arranged in parallel, the three groups of contactors a (7-1) are respectively connected with the three groups of filters a (6-1) through cables, and the three groups of contactors a (7-1) corresponding to the output A, B, C are respectively and correspondingly connected with three phases at the output side of the high-voltage motor;
the high-voltage power supply and the heat dissipation device are characterized by further comprising a container (10), wherein the high-voltage power supply (1), the input protection unit (2), the input filtering unit (3), the frequency conversion unit (4), the main controller (5), the output filtering unit (6), the output protection unit (7) and the heat dissipation unit (8) are arranged in the container (10), the heat dissipation unit (8) comprises an air conditioner and an internal circulating fan which are arranged in the container (10), and the air conditioner and the internal circulating fan are electrically connected with an external auxiliary power supply (9) and the main controller (5);
a high-frequency matrix type light-weight totally-enclosed high-voltage frequency conversion device is characterized in that eight groups of anti-series high-frequency low-voltage IGBTs form a highly-modularized integrated unit, and then a matrix topological structure with the integrated unit as a basic frequency conversion component module is built, so that the light-weight design of a high-voltage high-power frequency conversion system of 10kV or more is realized, and a totally-enclosed self-circulation heat dissipation container type skid-mounted structure is adopted;
a real-time process of a high-frequency matrix type light-weight totally-enclosed high-voltage frequency conversion device comprises the following steps:
after being electrified, all hardware is checked, if the device is abnormal during testing, the input protection unit (2) and the output protection unit (7) are cut off simultaneously, the frequency conversion device is in a safe maintenance independent state, the indication elements of all devices are ensured to be normally displayed, and if the device is in combined operation, the device is communicated and debugged with other equipment through the main controller (5), and the network communication among the equipment is ensured to be smooth;
the high-voltage power of 10kVA at the power grid side is transmitted to a frequency conversion device through a high-voltage power supply 1, and then enters three groups of contactors (2-1) in an input protection unit (2) to carry out undervoltage or voltage loss protection after being closed through a high-voltage disconnecting link, and the three groups of contactors (2-1) are further connected with a fuse (2-2) to carry out short-circuit overcurrent protection; the device is a matrix alternating-alternating frequency framework, can operate in four quadrants, and has bidirectional current flow direction;
after the system is normally started, current flows into three filters (3-1) of an input filter unit (3) to respectively carry out filtering of each phase, the filters are filter circuits consisting of capacitors and inductors, frequency points of specific frequency in a power line or frequencies except the frequency points are effectively filtered, so that relatively pure high-voltage current enters a frequency conversion unit (4), an integrated module of the frequency conversion unit (4) is connected in series by low-voltage IGBT (insulated gate bipolar translator) sub-modules, the high-voltage current is directly input after being filtered, and is directly output after being filtered, a transformer is omitted, and data interaction is carried out between a main controller and the frequency conversion unit by adopting high-speed optical fiber anti-interference signals;
the main controller (5) takes a low-power ARM as an embedded single board computer of a core chip, is connected with the frequency conversion unit (4) through high-speed optical fiber transmission, loads a PWM (pulse-width modulation) duty ratio algorithm program, is started through an external auxiliary power supply, scans a communication state after initialization setting, and outputs instructions to the integrated modules a-i of the frequency conversion unit (4) through an optical fiber network according to preset frequency conversion algorithm software after ensuring stable and normal communication, the program performs chopping control through a duty ratio PWM (pulse-width modulation) algorithm, the IGBT adopts 4500V voltage-grade insulated gate bipolar transistor elements, can output any output voltage lower than 10kV through anti-series connection and cascade connection, and the modulated voltage enters the output filtering unit (6);
the output filter unit (6) filters out a frequency point with a specific frequency or frequencies except the frequency point, the voltage further enters a contactor a (7-1) of the output protection unit (7), and the contactor can perform on-off control on a rear external high-voltage motor;
when the device normally operates, a temperature control program in the main controller (5) automatically monitors the room temperature of the space in the container, and the air conditioner and the internal circulating fan of the heat dissipation unit (8) are started in due time to circulate the internal air quickly to realize the indoor constant temperature control of the container;
the output voltage of the device is connected with an external high-voltage alternating-current variable-frequency motor through a high-voltage motor output side terminal, so that variable-frequency transmission driving is performed.
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| CN102545644B (en) * | 2012-03-14 | 2014-07-16 | 山东大学 | Matrix AC (alternating current)-AC high voltage frequency converter topology structure |
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