CN113629706A - Workshop-level centralized power supply system - Google Patents
Workshop-level centralized power supply system Download PDFInfo
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- CN113629706A CN113629706A CN202110960404.5A CN202110960404A CN113629706A CN 113629706 A CN113629706 A CN 113629706A CN 202110960404 A CN202110960404 A CN 202110960404A CN 113629706 A CN113629706 A CN 113629706A
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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
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- 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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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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
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional 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
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of DC power input into AC power output without possibility of reversal 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
- H02M7/537—Conversion of DC power input into AC power output without possibility of reversal 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, e.g. single switched pulse inverters
- H02M7/5387—Conversion of DC power input into AC power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration
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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
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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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- 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
- Y02E40/40—Arrangements for reducing harmonics
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a workshop level centralized power supply system, which comprises: the phase-shifting transformer comprises a group of three-phase primary windings and a plurality of groups of corresponding three-phase secondary windings, wherein the three-phase primary windings are connected with a medium-voltage distribution network, and the plurality of groups of three-phase secondary windings are mutually staggered; the rectifier circuit comprises a plurality of rectifiers which are connected in parallel, wherein each rectifier is correspondingly connected with one three-phase secondary winding, and outputs direct current through the capacitor filter circuit via direct current buses on two sides; and the converter circuit comprises a plurality of converters sharing the direct-current bus, each converter comprises an IGBT bridge module, and the midpoint of each IGBT bridge module is output through a reactor. The problems that high-order harmonic interference and low energy conversion efficiency are difficult to overcome in existing workshop power distribution can be solved.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a workshop-level centralized power supply system.
Background
In factory workshops of various industries, the electric loads are more and more diversified, and the requirements on the technical performance of a power supply are higher and higher; secondly, the application of a large amount of distributed new energy and a novel intelligent power grid also puts more requirements on inter-vehicle level power distribution, and the problems of high harmonic interference, low energy conversion efficiency, electric power safety and the like are difficult to overcome in the traditional inter-vehicle power distribution. Therefore, it is an urgent problem to provide a power supply system capable of avoiding higher harmonic interference and high energy conversion efficiency.
Disclosure of Invention
In view of the above defects or improvement needs in the prior art, the present invention provides a vehicle-to-vehicle centralized power supply system, which can solve the problems that the existing vehicle-to-vehicle power distribution is difficult to overcome the interference of higher harmonics and the energy conversion efficiency is low.
Specifically, an embodiment of the present invention provides a vehicle-to-vehicle level centralized power supply system, including: the phase-shifting transformer comprises a group of three-phase primary windings and a plurality of groups of corresponding three-phase secondary windings, wherein the three-phase primary windings are connected with a medium-voltage distribution network, and the plurality of groups of three-phase secondary windings are mutually staggered; the rectifier circuit comprises a plurality of rectifiers which are connected in parallel, wherein each rectifier is correspondingly connected with a group of three-phase secondary windings, and outputs direct current through the capacitor filter circuit via direct current buses on two sides; and the converter circuit comprises a plurality of converters sharing the direct-current bus, each converter comprises an IGBT bridge module, and the midpoint of each IGBT bridge module is output through a reactor.
In one embodiment of the present invention, the phase-shifting transformer further comprises: and the low-voltage distribution winding corresponding to the three-phase primary winding is used for accessing a power frequency load.
In one embodiment of the present invention, the transformation ratio between each set of the three-phase secondary windings and the three-phase primary windings is the same, and the phase angle between each set of the three-phase secondary windings is 60 divided by the number of the three-phase secondary windings.
In one embodiment of the present invention, two of the three-phase secondary windings connected to the rectifier are connected in a delta connection and a star connection, and the other three-phase secondary windings are connected in a delta-connection and a column-wise connection.
In one embodiment of the invention, the number of the three-phase secondary windings connected with the rectifier is 4 groups, and the number of the low-voltage distribution windings is 1 group.
In an embodiment of the present invention, every three IGBT bridge modules form a three-phase ac variable speed power supply, which is controlled by an independent variable frequency program unit, and works in a four-quadrant SPWM variable frequency variable speed state to control one or more variable frequency variable speed motors.
In one embodiment of the invention, one or more IGBT bridge modules are connected in parallel to output, and operate in a chopping mode to form a dc bidirectional converter.
In an embodiment of the invention, every two IGBT bridge modules are combined to form an intermediate frequency inverter power supply under the control of an intermediate frequency conversion program module, and the intermediate frequency inverter power supply is used for intermediate frequency induction heating loads.
In one embodiment of the present invention, a fast fuse is connected between each IGBT bridge module and the dc bus.
In an embodiment of the present invention, the rectifying circuit and the inverter circuit are mounted on the same heat dissipation module.
As can be seen from the above, the above solution contemplated by the present invention may have one or more of the following advantages compared to the prior art:
(1) by means of mutual phase staggering among each group of three-phase secondary windings and one-to-one corresponding connection of a plurality of rectifiers which are connected in parallel, each rectifier outputs direct current after being filtered by a capacitor filter loop, so that the problems of higher harmonics and electromagnetic interference are solved in a centralized mode, the reliability of a power distribution system is improved, the influence of the harmonics on the system is reduced to a great extent, and meanwhile, the circuit connection structure meets the requirements that under the condition of nonlinear load electricity utilization, the medium-voltage side of a phase-shifting transformer still has high power factors and low current distortion;
(2) because the higher voltage converted by the multiple groups of three-phase secondary windings connected with the rectifier is directly input into a workshop, the lower voltage and the larger current converted by the low-voltage distribution winding are directly connected into a power frequency load, the transmission line is short, and the energy transmission loss is extremely low;
(3) the converter circuit comprises a plurality of converters which are mutually connected in parallel and share a direct-current bus, each converter comprises one IGBT bridge module, every three IGBT bridge modules form a three-phase alternating-current speed-regulating power supply, or the three IGBT bridge modules are output in parallel through one or more IGBT bridge modules to form a direct-current bidirectional converter, or every two IGBT bridge modules are combined to form a medium-frequency inverter power supply, so that the complex requirements of industrial production power loads can be met, and the access of new energy, energy storage and flexible interconnection is facilitated;
(4) each circuit module adopts integrated, standardized configuration, makes things convenient for spare equipment component to change to rectifier circuit and converter circuit for example install on same heat dissipation module, can realize integrated heat dissipation, and simple structure is reliable.
Other aspects and features of the present invention will become apparent from the following detailed description, which proceeds with reference to the accompanying drawings. It is to be understood, however, that the drawings are designed solely for purposes of illustration and not as a definition of the limits of the invention. It should be further understood that the drawings are not necessarily drawn to scale and that, unless otherwise indicated, they are merely intended to conceptually illustrate the structures and procedures described herein.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a vehicle-to-vehicle level centralized power supply system according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of a centralized power supply system at a vehicle compartment level according to an embodiment of the present invention;
fig. 3 is another block diagram of the centralized power supply system at the vehicle compartment level according to the embodiment of the present invention;
fig. 4 is a schematic block diagram of a centralized power supply system at a vehicle compartment level according to an embodiment of the present invention;
fig. 5 is another schematic structural diagram of the inter-vehicle level centralized power supply system according to the embodiment of the present invention.
Description of the reference numerals
11: a phase-shifting transformer; 111: a three-phase primary winding; 112: a three-phase secondary winding; 113: a low voltage distribution winding;
12: a rectifying circuit; 121: a rectifier;
13: a current transformation circuit; 131: a current transformer; 132: a reactor; 133: a three-phase AC speed-regulating power supply; 134: a DC bi-directional converter; 135: a medium frequency inverter power supply; 136: a fast fuse;
14: and a direct current bus.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The invention will be described in connection with embodiments with reference to the drawings.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments should fall into the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the method is simple. The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As shown in fig. 1, an embodiment of the present invention provides a vehicle-to-vehicle level centralized power supply system, for example, including: a phase-shifting transformer 11, a rectifying circuit 12 and a current converting circuit 13. The phase-shifting transformer 11 includes, for example, a set of three-phase primary windings 111 and a plurality of corresponding sets of three-phase secondary windings 112, the three-phase primary windings 111 are connected to a 10kV medium-voltage distribution network through, for example, a switch cabinet and a pre-charging loop, and a 10kV medium voltage enters a power supply system to reduce line loss. The input voltage is converted into the circuit operating voltage required by the power supply system between the multiple sets of three-phase secondary windings 112 and the three-phase primary windings 111 through a certain voltage conversion ratio, and particularly, the phase angles between the three-phase secondary windings 112 of the respective sets are, for example, uniformly staggered by a certain angle.
The rectifying circuit 12 includes, for example, a plurality of rectifiers 121 connected in parallel with each other, such as full-wave rectifiers, wherein each full-wave rectifier 121 is connected to a set of three-phase secondary windings 112, as shown in fig. 1, each full-wave rectifier 121 includes, for example, three diode rectifying paths connected in parallel with each other, respectively connected to different phases of the three-phase secondary windings 112, and outputs a dc current via the dc bus 14 on both sides of the full-wave rectifying circuit 12 after being filtered by a capacitor filtering loop.
The converter circuit 13 includes, for example, a plurality of converters 131 sharing the dc bus, each converter 131 is connected in parallel, and each converter 131 includes, for example, an Insulated Gate Bipolar Transistor (IGBT) bridge module for serving as a single-phase converter, for example, for converting dc power input from the dc bus 14 into ac power and outputting the ac power. Specifically, each IGBT bridge module is, for example, a power module formed by connecting two IGBT elements in series, and is connected to the positive electrode and the negative electrode of the dc bus 14, respectively, and the midpoints of the two IGBT elements form a single-phase current port through the reactor 132 for outputting an ac current to the load. Of course, in other embodiments, each IGBT bridge module is formed by connecting more than two IGBT elements in series, for example, and the invention is not limited thereto.
In operation, when a load occurs on a line where any one of the converters 131 is located, the direct current bus 14 obtains electric energy from lines where one or more other converters 131 connected in parallel with the converter 131 are located, and therefore transfer and compensation of the electric energy can be achieved.
It should be noted that, in the above technical solution of the present invention, because each group of three-phase secondary windings 112 are in phase-staggered relationship with each other, and a plurality of full-wave rectifiers 121 connected in parallel with each other are connected in one-to-one correspondence, each full-wave rectifier 121 outputs a direct current after being filtered by a capacitor filter circuit, thereby realizing centralized processing of higher harmonics and electromagnetic interference problems, improving the reliability of the power distribution system, and greatly reducing the influence of the harmonics on the system; meanwhile, the circuit connection structure meets the requirements that under the condition of nonlinear load electricity utilization, the medium-voltage side of the phase-shifting transformer 11 still has high power factor and low current distortion.
Further, the phase-shifting transformer 11 of the inter-vehicle level centralized power supply system further includes, for example, a group of low-voltage distribution windings 113 corresponding to the three-phase primary windings 111, for example, outputting 400v three-phase voltages, and it should be noted that the low-voltage distribution windings 113 are also a group of three-phase secondary windings 112, but are not connected to the rectifier 121, and are used for accessing a conventional three-phase power frequency load. Because 10kv medium voltage is input into a workshop through higher voltage converted by a plurality of groups of three-phase secondary windings 112 connected with the rectifier 121, lower voltage and larger current converted by the low-voltage distribution winding 113 are directly connected to a power frequency load, the transmission line is short, and the energy transmission loss is extremely low.
Further, the voltage transformation ratio between each set of three-phase secondary windings 112 and the three-phase primary windings 111 is, for example, the same, the number of the three-phase secondary windings 112 is, for example, n, and the phase angles between the sets of three-phase secondary windings 112 are, for example, staggered by 60/n from each other, so that the power distribution loss can be reduced, and the energy conversion efficiency can be improved. Specifically, two groups of three-phase secondary windings 112 connected to the full-wave rectifier 121 on the dc bus side among the three-phase secondary windings 112 are connected in a delta connection and a star connection, respectively, and the other three-phase secondary windings 112 between the two groups of three-phase secondary windings 112 are connected in a delta-connection manner, so as to realize mutual phase staggering 60/n between the three-phase secondary windings 112 of each group.
Further, since the effective value of the higher harmonic is inversely proportional to the harmonic order and the ratio of the effective value of the higher harmonic to the effective value of the fundamental wave is the reciprocal of the harmonic order, in the technical solution of the present invention, the harmonic order is proportional to the number of the three-phase secondary windings 112 and satisfies the requirement that the harmonic order is 6n ± 1, and in one embodiment, the harmonic order is at least 23 when the number of the three-phase secondary windings 112 is 4, that is, 1/23 where the effective value of the higher harmonic is the effective value of the fundamental wave, so that the requirement of most power supply systems can be satisfied.
In one embodiment, as shown in fig. 2, since an ac side port of each of the IGBT bridge modules is connected in series to a reactor 132 to form a single-phase ac port for outputting single-phase ac power, for example, every three IGBT bridge modules form a three-phase ac speed-adjusting power supply 133, which is controlled by an independent variable frequency program unit, and the SPWM (Sinusoidal Pulse Width Modulation) variable frequency speed-adjusting state operating in four quadrants controls one or more variable frequency speed-adjusting motors. Of course, in other embodiments of the present invention, a single-phase power source is connected to one single-phase current port of one of the IGBT bridge modules or a two-phase power source is connected to two single-phase current ports of the IGBT bridge modules, in this way, a plurality of converters 131 sharing the dc bus 14 form an annular power supply loop, and flexible interconnection among the single-phase power source, the two-phase power source, and the three-phase power source can be achieved.
In one embodiment, as shown in fig. 3, a high-power dc bi-directional converter 134 may be formed by connecting one or more IGBT bridge modules in parallel, controlling the converter by a microprocessor, and operating in a chopping mode, so as to implement a step-up function of energy from a low-voltage side to the dc bus 14 and a step-down function of energy from the dc bus 14 to the low-voltage side, specifically, for example, for connecting an adjustable dc load or connecting a high-power new energy power generation or electrochemical energy storage battery, etc.
In one embodiment, as shown in fig. 4, each two IGBT bridge modules are combined to form an intermediate frequency inverter power supply 135 under the control of an intermediate frequency conversion program module, which can convert dc power into ac power with constant frequency and constant voltage or with frequency and voltage modulation for connecting to an intermediate frequency induction heating load.
Further, as shown in fig. 5, a fast fuse 136 is connected between each IGBT bridge module and the dc bus 14 for short-circuit protection or severe overload protection.
Further, in the above technical solution of the present invention, since each circuit module adopts an integrated and standardized configuration, it is convenient for spare device elements to be replaced, and the rectification circuit 12 and the inverter circuit 13 are installed on the same heat dissipation module, for example. The heat dissipation module is a water-cooling heat sink, can realize integrated heat dissipation, and is simple and reliable in structure.
In summary, in the vehicle-to-vehicle concentrated power supply system provided in the embodiment of the present invention, each group of three-phase secondary windings is staggered with respect to each other, and each rectifier is connected to a plurality of rectifiers connected in parallel with each other in a one-to-one correspondence manner, and each rectifier outputs a direct current after being filtered by a capacitor filter circuit, so that the problems of high order harmonics and electromagnetic interference are centrally handled, the reliability of a power distribution system is improved, and the influence of the harmonics on the system is greatly reduced, and the circuit connection structure satisfies that the medium-voltage side of the phase-shifting transformer still has a high power factor and a low current distortion under the condition of nonlinear load power consumption; because the medium-voltage power distribution is input into a workshop through the higher voltage converted by the multiple three-phase secondary windings, the lower voltage and the larger current converted by the low-voltage power distribution winding are directly connected into a power frequency load, the transmission line is short, and the energy transmission loss is extremely low; the converter circuit comprises a plurality of converters which are mutually connected in parallel and share a direct-current bus, each converter comprises one IGBT bridge module, every three IGBT bridge modules form a three-phase alternating-current speed-regulating power supply, or the three IGBT bridge modules are output in parallel through one or more IGBT bridge modules to form a direct-current bidirectional converter, or every two IGBT bridge modules are combined to form a medium-frequency inverter power supply, so that the complex requirements of industrial production power loads can be met, and the access of new energy, energy storage and flexible interconnection is facilitated; each circuit module adopts integrated, standardized configuration, makes things convenient for spare equipment component to change to rectifier circuit and converter circuit for example install on same heat dissipation module, can realize integrated heat dissipation, and simple structure is reliable.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A compartment-level centralized power supply system, comprising:
the phase-shifting transformer comprises a group of three-phase primary windings and a plurality of groups of corresponding three-phase secondary windings, wherein the three-phase primary windings are connected with a medium-voltage distribution network, and the plurality of groups of three-phase secondary windings are mutually staggered;
the rectifier circuit comprises a plurality of rectifiers which are connected in parallel, wherein each rectifier is correspondingly connected with a group of three-phase secondary windings, and outputs direct current through the capacitor filter circuit via direct current buses on two sides;
and the converter circuit comprises a plurality of converters sharing the direct-current bus, each converter comprises an IGBT bridge module, and the midpoint of each IGBT bridge module is output through a reactor.
2. The system of claim 1, wherein the phase-shifting transformer further comprises: and the low-voltage distribution winding corresponding to the three-phase primary winding is used for accessing a power frequency load.
3. The system of claim 1, wherein the transformation ratio between each set of the three-phase secondary windings and the three-phase primary windings is the same, and the phase angle between each set of the three-phase secondary windings is 60 divided by the number of the three-phase secondary windings.
4. The system according to claim 3, wherein two of said three-phase secondary windings connected to said rectifier are connected in delta and star connection, and the other three-phase secondary windings are connected in delta connection.
5. The system of claim 4, wherein the number of the three-phase secondary windings connected to the rectifier is 4 groups, and the number of the low-voltage distribution windings is 1 group.
6. The vehicle-to-vehicle centralized power supply system according to claim 1, wherein every three IGBT bridge modules form a three-phase ac speed-regulating power supply, which is controlled by an independent variable frequency program unit and operates in a four-quadrant SPWM variable frequency speed-regulating state to control one or more variable frequency speed-regulating motors.
7. The vehicle-to-vehicle centralized power supply system according to claim 1, wherein one or more IGBT bridge modules are connected in parallel to output, and operate in a chopping mode to form a dc bidirectional converter.
8. The vehicle-bay level centralized power supply system according to claim 1, wherein every two IGBT bridge modules are combined to form a medium frequency inverter power supply under the control of a medium frequency conversion program module, and the medium frequency inverter power supply is connected to a medium frequency induction heating load.
9. The system of claim 1, wherein a fast acting fuse is connected between each IGBT bridge module and the dc bus.
10. The vehicle-to-vehicle centralized power supply system according to claim 1, wherein the rectifying circuit and the inverter circuit are mounted on the same heat dissipation module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110960404.5A CN113629706A (en) | 2021-08-20 | 2021-08-20 | Workshop-level centralized power supply system |
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