CN114006366A - Wide direct current output power electronic interface device and wide direct current output method - Google Patents

Wide direct current output power electronic interface device and wide direct current output method Download PDF

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Publication number
CN114006366A
CN114006366A CN202111485103.8A CN202111485103A CN114006366A CN 114006366 A CN114006366 A CN 114006366A CN 202111485103 A CN202111485103 A CN 202111485103A CN 114006366 A CN114006366 A CN 114006366A
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Prior art keywords
direct current
module
output
modules
electric load
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Inventor
魏琛
孙丽敬
季宇
刘海涛
吴鸣
吕广宪
高波
刘国宇
蔺圣杰
王海涛
邢通
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China Online Shanghai Energy Internet Research Institute Co ltd
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China Online Shanghai Energy Internet Research Institute Co ltd
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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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/102—Parallel operation of dc sources being switching converters
    • 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
    • H02M3/285—Single converters with a plurality of output stages connected in parallel
    • 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
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The embodiment of the invention discloses a wide direct current output power electronic interface device, a wide direct current output method, a storage medium and electronic equipment, wherein a two-stage structure of a bidirectional AC/DC converter and N DC/DC modules is adopted, the AC/DC converter can convert alternating current input into stable output direct current, the N DC/DC modules convert direct current output by a front stage into direct current which finally meets requirements, switching devices are connected to different positions of input and output lines of each DC/DC module, the connection quantity and the serial-parallel connection mode of the DC/DC modules are flexibly controlled by controlling the disconnection or the connection of the switching devices, the output voltage and the current of a direct current side can be flexibly adjusted, wide direct current output is realized, the connection requirements of different loads are matched, and the wide direct current output power electronic interface device is suitable for various power distribution application scenes such as energy storage, flexible direct current interconnection, transformer area micro-grids, electric vehicles and the like, meanwhile, the multi-winding isolation transformer with complex design is avoided, the design is easy, and the operation is simple.

Description

Wide direct current output power electronic interface device and wide direct current output method
Technical Field
The invention relates to the technical field of power electronic conversion, in particular to a wide direct current output power electronic interface device, a wide direct current output method, a storage medium and electronic equipment.
Background
With the daily change of power revolution, intelligent development, low-carbon transformation, multi-element fusion and business model, the energy internet is developing steadily in the situation of being unable to keep off, and the vigorous development of novel power supplies represented by photovoltaic and wind power and novel loads represented by electric automobiles is a necessary way for realizing green transformation of energy production. However, a large-scale novel power supply and a novel load are connected into a power distribution network, and huge impact is brought to a power supply system. The novel loads of a distributed power supply, an electric automobile and the like have strong randomness, the problems of large power fluctuation of a power distribution system, reduction of system inertia, increase of uncertainty, high total consumption cost and the like are easily caused, and the severe challenge is brought to power supply safety and guarantee. In recent years, technologies such as energy storage, flexible direct interconnection and the like which are adopted successively can play roles of flexibly scheduling resources, clipping and filling valley, uninterrupted operation, frequency modulation auxiliary service, dynamic capacity increase of a transformer area and the like, so that the power supply environment of a power grid is improved, and the source-grid-load balance requirement among regional power systems is met. In all application scenarios, the power electronic interface device is one of the indispensable links.
The power electronic interface device is an important part for connecting various loads and a power distribution network and is one of the most important links in a modern power distribution network system. However, the existing power system has various loads and complex power utilization environment, and the requirements of different application scenes on the interface device are different. In a distributed power grid connection and a platform micro-grid, a power electronic interface device mainly converts renewable energy into electric energy meeting the requirements of a power grid and transmits the electric energy to the power grid, and meanwhile, the stable operation of a distributed power generation system is ensured; in energy storage, the interface device is required to have the plug-and-play characteristic, can be connected to a power distribution network at any time and any place, and plays roles of emergency power protection, emergency repair power supply and the like; in flexible-direct interconnection, the power electronic device is required to have various structures, and various structural forms such as multi-end alternating current and direct current mixing and honeycomb can be provided, so that the diversity of power supply forms is improved. The existing power electronic interface device is fixed in structure and single in function, most of single devices can only be suitable for one specific application occasion, and are difficult to be suitable for multiple application scenes, and the flexibility is insufficient.
Disclosure of Invention
The invention provides a power electronic interface device, which aims to solve the technical problems that in the prior art, the structure is fixed, the function is single, most of single devices can only be applied to one specific application occasion, the single devices are difficult to be applied to multiple application scenes, and the flexibility is insufficient. Embodiments of the present invention provide a wide direct current output power electronic interface device and a wide direct current output method, as well as a storage medium and an electronic apparatus.
According to an aspect of an embodiment of the present invention, there is provided a wide DC output power electronic interface apparatus, the apparatus comprising at least 1 bidirectional AC/DC converter, N DC/DC modules and 5N-1 switching devices, each bidirectional isolated DC/DC converter being a separate DC/DC module, wherein:
the direct-current side of the bidirectional AC/DC converter is connected with two input lines on the direct-current input side of each DC/DC module through a direct-current bus capacitor Cdc, wherein the two input lines are respectively a positive input line and a negative input line;
the positive pole input line of each DC/DC module is connected with 1 switching device, the negative pole input line is connected with 1 switching device, and the positive pole input lines and the negative pole input lines of the N DC/DC modules are respectively connected;
the direct current output side of each DC/DC module is a load side, is used for connecting an electric load, and comprises two output lines, namely a positive output line and a negative output line;
and 1 switching device is connected to the positive electrode output line of each DC/DC module, 1 switching device is connected to the negative electrode output line, the positive electrode output lines and the negative electrode output lines of the N DC/DC modules are respectively connected, and 1 switching device is connected between the positive electrode output line of the nth DC/DC module and the negative electrode output line of the (N-1) th DC/DC module, wherein N is more than or equal to 2 and less than or equal to N.
Optionally, in each of the above device embodiments of the present invention, the alternating current side of the bidirectional AC/DC converter is connected to the three-phase power distribution network through the output filters La, Lb, Lc.
Alternatively, in the above embodiments of the apparatus of the present invention, the bidirectional AC/DC converter may be any one of the converters in the common bus structure.
Optionally, in each of the above device embodiments of the present invention, the DC/DC module is any one of bidirectional isolated DC/DC converters.
Optionally, in each of the above apparatus embodiments of the present invention, the switching device is any one of a circuit breaker, a semi-controlled device, and a fully-controlled device.
According to another aspect of the embodiments of the present invention, there is provided a method of using the wide dc output of the wide dc output power electronic interface device of the embodiments, the method comprising:
according to the power level P of a single DC/DC moduledAnd the power class P of the electric load to be connected0Calculating the number C of DC/DC modules to be connected with the electric load;
determining the connection mode of a DC/DC module to be connected with the electric load according to the voltage and current level of the electric load, wherein the connection mode comprises a parallel connection mode and a series connection mode;
and controlling the switching devices on the DC/DC modules to be connected with the electric load to be opened or closed according to the number and the connection mode of the DC/DC modules to be connected with the electric load, so as to realize wide direct current output.
Optionally, in each of the above method embodiments of the present invention, the number of DC/DC modules to be connected to the electrical load is calculated according to the power level of a single DC/DC module and the power level of the electrical load to be connected, where the calculation formula is:
Figure 941627DEST_PATH_IMAGE001
。
optionally, in the foregoing method embodiments of the present invention, determining a connection manner of the DC/DC module to be connected to the electrical load according to the voltage and current level of the electrical load includes:
when the voltage and current grade of the electric load is high-voltage low-current output, the DC/DC module to be connected with the electric load adopts a series connection mode;
when the voltage and current level of the electric load is low-voltage large-current output, the DC/DC module to be connected with the electric load adopts a parallel connection mode.
Optionally, in the foregoing method embodiments of the present invention, controlling, according to the number and the connection manner of the DC/DC modules to be connected to the electrical load, the switching devices on the DC/DC modules to be connected to the electrical load to be opened or closed, and implementing the wide direct current output includes:
when the DC/DC module to be connected with the electric load adopts a series connection mode:
switching devices on two input lines at the direct current input side of the C DC/DC modules to be connected with the electric load are closed;
among C DC/DC modules to be connected with an electric load, a switch device on a positive output line of a direct current output side of a 1 st DC/DC module is closed, a switch device on a negative output line of a direct current output side of the C th DC/DC module is closed, a switch device is connected between the positive output line of the C th DC/DC module and the negative output line of the C-1 st DC/DC module and is closed, and other switch devices on the direct current output side are opened, wherein C is more than or equal to 2 and less than or equal to C;
switching devices on two input lines at the direct current input side and switching devices on two output lines at the direct current output side of other DC/DC modules which are not connected with the electric load are disconnected;
when the DC/DC module to be connected with the electric load adopts a parallel connection mode:
switching devices on two input lines at the direct current input side of the C DC/DC modules to be connected with the electric load are closed;
switching devices on two output lines at the direct current output side of the C DC/DC modules to be connected with the electric load are closed, and other switching devices are opened;
and the switching devices on the two input lines at the direct current input side and the switching devices on the two output lines at the direct current output side of the DC/DC module which is not connected with the electric load are disconnected.
According to still another aspect of embodiments of the present invention, there is provided a computer-readable storage medium storing a computer program for executing the wide dc output method according to any one of the above-described embodiments of the present invention.
According to still another aspect of an embodiment of the present invention, there is provided an electronic apparatus, including:
a processor;
a memory for storing the processor-executable instructions;
the processor is configured to read the executable instruction from the memory and execute the instruction to implement the wide dc output method according to any of the above embodiments of the present invention.
Based on the wide direct current output power electronic interface device, the wide direct current output method, the storage medium and the electronic equipment provided by the embodiment of the invention, a two-stage structure of a bidirectional AC/DC converter and N DC/DC modules is adopted, the AC/DC converter can convert AC input power into direct current with stable output, and each DC/DC module converts direct current output by a front stage into direct current which finally meets the requirement and can play a role in isolation protection. The power electronic interface device is connected with the switch devices at different positions of input and output lines of each DC/DC module, the connection quantity and the series-parallel connection mode of the DC/DC modules are flexibly controlled by controlling the disconnection or the connection of the switch devices, the output voltage and the current of a direct current side can be flexibly adjusted, wide direct current output is realized, the connection requirements of different loads are matched, the power electronic interface device is applicable to various power distribution application scenes such as energy storage, flexible-direct interconnection, a transformer area micro-grid and an electric automobile, meanwhile, a multi-winding isolation transformer with complex design is avoided, the design is easy, and the operation is simple.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail embodiments of the present invention with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments 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 principles of the invention and not to limit the invention. In the drawings, like reference numbers generally represent like parts or steps.
Fig. 1 is a schematic structural diagram of a wide dc output power electronic interface device according to an exemplary embodiment of the present invention;
FIG. 2 is a schematic flow diagram of a wide DC output method using a wide DC output power electronic interface device according to an exemplary embodiment of the invention;
fig. 3 is a schematic structural diagram of two DC/DC modules connected in series in a wide DC output power electronic interface device according to an exemplary embodiment of the present invention;
fig. 4 is a schematic structural diagram of two DC/DC modules connected in parallel in a wide DC output power electronic interface device according to an exemplary embodiment of the present invention;
fig. 5 is a structure of an electronic device according to an exemplary embodiment of the present invention.
Detailed Description
Hereinafter, example embodiments according to the present invention will be described in detail with reference to the accompanying drawings. It is to be understood that the described embodiments are merely a subset of embodiments of the invention and not all embodiments of the invention, with the understanding that the invention is not limited to the example embodiments described herein.
It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
It will be understood by those of skill in the art that the terms "first," "second," and the like in the embodiments of the present invention are used merely to distinguish one element, step, device, module, or the like from another element, and do not denote any particular technical or logical order therebetween.
It should also be understood that in embodiments of the present invention, "a plurality" may refer to two or more and "at least one" may refer to one, two or more.
It is also to be understood that any reference to any component, data, or structure in the embodiments of the invention may be generally understood as one or more, unless explicitly defined otherwise or stated to the contrary hereinafter.
In addition, the term "and/or" in the present invention is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In the present invention, the character "/" generally indicates that the preceding and following related objects are in an "or" relationship.
It should also be understood that the description of the embodiments of the present invention emphasizes the differences between the embodiments, and the same or similar parts may be referred to each other, so that the descriptions thereof are omitted for brevity.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Embodiments of the invention are operational with numerous other general purpose or special purpose computing system environments or configurations, and with numerous other electronic devices, such as terminal devices, computer systems, servers, etc. Examples of well known terminal devices, computing systems, environments, and/or configurations that may be suitable for use with electronic devices, such as terminal devices, computer systems, servers, and the like, include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, hand-held or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, networked personal computers, minicomputer systems, mainframe computer systems, distributed cloud computing environments that include any of the above, and the like.
Electronic devices such as terminal devices, computer systems, servers, etc. may be described in the general context of computer system-executable instructions, such as program modules, being executed by a computer system. Generally, program modules may include routines, programs, objects, components, logic, data structures, etc. that perform particular tasks or implement particular abstract data types. The computer system/server may be practiced in distributed cloud computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed cloud computing environment, program modules may be located in both local and remote computer system storage media including memory storage devices.
Exemplary devices
Fig. 1 is a schematic structural diagram of a wide dc output power electronic interface device according to an exemplary embodiment of the present invention. As shown in FIG. 1, this exampleThe wide direct current output power electronic interface device comprises 1 bidirectional AC/DC converter (AC/DC), N bidirectional isolation type DC/DC converters (♯ 1 to ♯ N) and 5N-1 switching devices (K + ♯ 1 to K + ♯ N, K to ♯ 1 to K- ♯ N, K + P1 to K + PN, K-P1 to K-PN and KS1 to KS(N-1)Each bidirectional isolated DC/DC converter is a separate DC/DC module, wherein:
the direct current side of the bidirectional AC/DC converter is connected with two input lines on the direct current input side of each DC/DC module through a direct current bus capacitor Cdc, wherein the two input lines are respectively a positive input line and a negative input line.
And the positive input line of each DC/DC module is connected with 1 switching device, the negative input line of each DC/DC module is connected with 1 switching device, and the positive input lines and the negative input lines of the N DC/DC modules are respectively connected.
The direct current output side of each DC/DC module is a load side and is used for connecting an electric load, and the DC/DC module comprises two output lines which are respectively a positive output line and a negative output line. The direct current output side is used as a load side and can be connected with various power electronic devices, such as an energy storage device, an electric automobile, a distributed power supply and the like.
And 1 switching device is connected to the positive electrode output line of each DC/DC module, 1 switching device is connected to the negative electrode output line, the positive electrode output lines and the negative electrode output lines of the N DC/DC modules are respectively connected, and 1 switching device is connected between the positive electrode output line of the nth DC/DC module and the negative electrode output line of the (N-1) th DC/DC module, wherein N is more than or equal to 2 and less than or equal to N.
Optionally, the AC side of the bidirectional AC/DC converter is connected to the three-phase power distribution network through output filters La, Lb, Lc.
Alternatively, the bidirectional AC/DC converter may be any one of common bus structure converters. The topology structure of the bidirectional AC/DC converter is not limited, and the bidirectional AC/DC converter can be a two-level structure, a three-level NPC structure and a three-level T-shaped structure, and the specific topology can be flexibly selected according to the requirements of actual application occasions.
Optionally, the DC/DC module is any one of bidirectional isolation type DC/DC converters. The topology structure of the bidirectional isolation type DC/DC converter in the embodiment is not limited, and may be a dual active bridge DC/DC converter, a bidirectional LLC resonant converter, a bidirectional L-LLC resonant converter, or the like.
Optionally, the switching device is any one of a circuit breaker, a semi-controlled device and a fully-controlled device. The type of the switching device in this embodiment is not limited, and may be a circuit breaker, a half-controlled device thyristor, a full-controlled device IGBT or MOSFET, and the like, and the specific topology and the type of the switching device should be flexibly selected according to the requirements of the actual application.
In summary, in the apparatus described in this embodiment, each bidirectional isolation type DC/DC converter is regarded as a single module, the switching devices are connected to different positions of the input and output lines of each DC/DC module, and the connection number and the serial-parallel connection manner of the DC/DC modules are controlled by controlling the on/off of the switching devices, so that the parallel current expansion and the serial voltage boost are realized, the purpose of wide DC output is achieved, and the connection requirements of loads of different power classes are met. The power electronic interface device described in this embodiment possesses the characteristics of the energy bidirectional flow, both can connect the energy storage device to supply power for distribution station emergency when the load is high, can charge for energy storage device or electric automobile when the load is low again, applicable in multiple distribution application scenarios such as energy storage, gentle straight interconnection, platform district microgrid, electric automobile.
Exemplary method
Fig. 2 is a schematic flowchart of a wide dc output method using a wide dc output power electronic interface device according to an exemplary embodiment of the invention. As shown in fig. 2, the wide dc output method according to the present embodiment includes:
step 201, according to the power level P of the single DC/DC moduledAnd the power class P of the electric load to be connected0Calculating the number C of DC/DC modules to be connected with the electric load;
step 202, determining a connection mode of a DC/DC module to be connected with an electric load according to the voltage and current level of the electric load, wherein the connection mode comprises a parallel connection mode and a series connection mode;
and step 203, controlling the switching devices on the DC/DC modules to be connected with the electric load to be opened or closed according to the number and the connection mode of the DC/DC modules to be connected with the electric load, so as to realize wide direct current output.
Optionally, the number of DC/DC modules to be connected to the electrical load is calculated according to the power level of a single DC/DC module and the power level of the electrical load to be connected, and the calculation formula is:
Figure 799993DEST_PATH_IMAGE001
。
optionally, the determining, according to the voltage-current level of the electrical load, a connection manner of the DC/DC module to be connected to the electrical load includes:
when the voltage and current grade of the electric load is high-voltage low-current output, the DC/DC module to be connected with the electric load adopts a series connection mode;
when the voltage and current level of the electric load is low-voltage large-current output, the DC/DC module to be connected with the electric load adopts a parallel connection mode.
Optionally, controlling the switching devices on the DC/DC modules to be connected to the electrical load to be opened or closed according to the number and connection manner of the DC/DC modules to be connected to the electrical load, and implementing the wide DC output includes:
when the DC/DC module to be connected with the electric load adopts a series connection mode:
switching devices on two input lines at the direct current input side of the C DC/DC modules to be connected with the electric load are closed;
among C DC/DC modules to be connected with an electric load, a switch device on a positive output line of a direct current output side of a 1 st DC/DC module is closed, a switch device on a negative output line of a direct current output side of the C th DC/DC module is closed, a switch device is connected between the positive output line of the C th DC/DC module and the negative output line of the C-1 st DC/DC module and is closed, and other switch devices on the direct current output side are opened, wherein C is more than or equal to 2 and less than or equal to C;
switching devices on two input lines of a direct current input side of the other DC/DC modules which are not connected with the electric load are disconnected with switching devices on two output lines of a direct current output side;
when the DC/DC module to be connected with the electric load adopts a parallel connection mode:
switching devices on two input lines at the direct current input side of the C DC/DC modules to be connected with the electric load are closed;
switching devices on two output lines at the direct current output side of the C DC/DC modules to be connected with the electric load are closed, and other switching devices are opened;
the switching devices on the two input lines on the direct current input side and the switching devices on the two output lines on the direct current output side of the DC/DC module, which are not connected to the electrical load, are both open.
Fig. 3 is a schematic structural diagram of two DC/DC modules connected in series in a wide DC output power electronic interface device according to an exemplary embodiment of the present invention. As shown in fig. 3, in the wide DC output power electronic interface apparatus, DC/DC module DC input side switching devices K + ♯ 1, K + ♯ 2, K- ♯ 1 and K- ♯ 2 are closed, and other switching devices are opened, at this time, the DC/DC modules of the access apparatus are ♯ 1 and ♯ 2, and the DC/DC module DC output side switching devices K + P1, K-P2 and KS1 are controlled to be closed, and other switching devices are opened, then two DC/DC modules ♯ 1 and ♯ 2 are connected in series.
Fig. 4 is a schematic structural diagram of two parallel DC/DC modules in a wide DC output power electronic interface device according to an exemplary embodiment of the present invention. As shown in fig. 4, in the wide DC output power electronic interface apparatus, DC/DC module DC input side switching devices K + ♯ 1, K + ♯ 2, K- ♯ 1 and K- ♯ 2 are closed, and other switching devices are opened, at this time, the DC/DC modules of the access apparatus are ♯ 1 and ♯ 2, and when the DC/DC module DC output side switching devices K + P1, K + P2, K-P1 and K-P2 are controlled to be closed, and other switching devices are opened, two DC/DC modules ♯ 1 and ♯ 2 are connected in parallel.
Exemplary electronic device
Fig. 5 is a structure of an electronic device according to an exemplary embodiment of the present invention. The electronic device may be either or both of the first device and the second device, or a stand-alone device separate from them, which stand-alone device may communicate with the first device and the second device to receive the acquired input signals therefrom. FIG. 5 illustrates a block diagram of an electronic device in accordance with an embodiment of the disclosure. As shown in fig. 5, the electronic device includes one or more processors 501 and memory 502.
The processor 501 may be a Central Processing Unit (CPU) or other form of processing unit having data processing capabilities and/or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.
Memory 502 may include one or more computer program products that may include various forms of computer-readable storage media, such as volatile memory and/or non-volatile memory. The volatile memory may include, for example, Random Access Memory (RAM), cache memory (cache), and/or the like. The non-volatile memory may include, for example, Read Only Memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium and executed by the processor 501 to implement the method for mining information of historical change records of the software program of the disclosed embodiments described above and/or other desired functions. In one example, the electronic device may further include: an input device 503 and an output device 504, which are interconnected by a bus system and/or other form of connection mechanism (not shown).
The input device 503 may also include, for example, a keyboard, a mouse, and the like.
The output device 504 can output various information to the outside. The output devices 504 may include, for example, a display, speakers, a printer, and a communication network and remote output devices connected thereto, among others.
Of course, for simplicity, only some of the components of the electronic device relevant to the present disclosure are shown in fig. 5, omitting components such as buses, input/output interfaces, and the like. In addition, the electronic device may include any other suitable components, depending on the particular application.
Exemplary computer program product and computer-readable storage Medium
In addition to the above-described methods and apparatus, embodiments of the present disclosure may also be a computer program product comprising computer program instructions that, when executed by a processor, cause the processor to perform the steps in the wide direct current output method according to various embodiments of the present disclosure described in the "exemplary methods" section above of this specification.
The computer program product may write program code for carrying out operations for embodiments of the present disclosure in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server.
Furthermore, embodiments of the present disclosure may also be a computer-readable storage medium having stored thereon computer program instructions that, when executed by a processor, cause the processor to perform the steps in the wide direct current output method according to various embodiments of the present disclosure described in the "exemplary methods" section above in this specification.
The computer-readable storage medium may take any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may include, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The foregoing describes the general principles of the present disclosure in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present disclosure are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present disclosure. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the disclosure is not intended to be limited to the specific details so described.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts in the embodiments are referred to each other. For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The block diagrams of devices, apparatuses, systems referred to in this disclosure are only given as illustrative examples and are not intended to require or imply that the connections, arrangements, configurations, etc. must be made in the manner shown in the block diagrams. These devices, apparatuses, devices, systems may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including, but not limited to," and are used interchangeably therewith. The words "or" and "as used herein mean, and are used interchangeably with, the word" and/or, "unless the context clearly dictates otherwise. The word "such as" is used herein to mean, and is used interchangeably with, the phrase "such as but not limited to".
The methods and apparatus of the present disclosure may be implemented in a number of ways. For example, the methods and apparatus of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustration only, and the steps of the method of the present disclosure are not limited to the order specifically described above unless specifically stated otherwise. Further, in some embodiments, the present disclosure may also be embodied as programs recorded in a recording medium, the programs including machine-readable instructions for implementing the methods according to the present disclosure. Thus, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.
It is also noted that in the devices, apparatuses, and methods of the present disclosure, each component or step can be decomposed and/or recombined. These decompositions and/or recombinations are to be considered equivalents of the present disclosure. The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the disclosure. Thus, the present disclosure is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the disclosure to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.

Claims (11)

1. A wide DC output power electronic interface device, comprising at least 1 bidirectional AC/DC converter, N DC/DC modules and 5N-1 switching devices, wherein:
the direct-current side of the bidirectional AC/DC converter is connected with two input lines on the direct-current input side of each DC/DC module through a direct-current bus capacitor Cdc, wherein the two input lines are respectively a positive input line and a negative input line;
the positive pole input line of each DC/DC module is connected with 1 switching device, the negative pole input line is connected with 1 switching device, and the positive pole input lines and the negative pole input lines of the N DC/DC modules are respectively connected;
the direct current output side of each DC/DC module is a load side, is used for connecting an electric load, and comprises two output lines, namely a positive output line and a negative output line;
and 1 switching device is connected to the positive electrode output line of each DC/DC module, 1 switching device is connected to the negative electrode output line, the positive electrode output lines and the negative electrode output lines of the N DC/DC modules are respectively connected, and 1 switching device is connected between the positive electrode output line of the nth DC/DC module and the negative electrode output line of the (N-1) th DC/DC module, wherein N is more than or equal to 2 and less than or equal to N.
2. The apparatus of claim 1, wherein the AC side of the bidirectional AC/DC converter is connected to a three-phase power distribution network through output filters La, Lb, Lc.
3. The apparatus of claim 1, wherein the bidirectional AC/DC converter is any one of a common bus configuration converter.
4. The apparatus of claim 1, wherein the DC/DC module is any one of a bi-directional isolated DC/DC converter.
5. The apparatus of claim 1, wherein the switching device is any one of a circuit breaker, a semi-controlled device, and a fully-controlled device.
6. A wide DC output method using the apparatus of any one of claims 1 to 5, the method comprising:
according to the power level P of a single DC/DC moduledAnd the power class P of the electric load to be connected0Calculating the number C of DC/DC modules to be connected with the electric load;
determining the connection mode of a DC/DC module to be connected with the electric load according to the voltage and current level of the electric load, wherein the connection mode comprises a parallel connection mode and a series connection mode;
and controlling the switching devices on the DC/DC modules to be connected with the electric load to be opened or closed according to the number and the connection mode of the DC/DC modules to be connected with the electric load, so as to realize wide direct current output.
7. The method according to claim 6, characterized in that the number of DC/DC modules to be connected to the electrical load is calculated from the power level of the single DC/DC module and the power level of the electrical load to be connected, according to the formula:
Figure 953594DEST_PATH_IMAGE001
。
8. the method of claim 6, wherein determining the connection mode of the DC/DC module to be connected to the electrical load according to the voltage and current level of the electrical load comprises:
when the voltage and current grade of the electric load is high-voltage low-current output, the DC/DC module to be connected with the electric load adopts a series connection mode;
when the voltage and current level of the electric load is low-voltage large-current output, the DC/DC module to be connected with the electric load adopts a parallel connection mode.
9. The method of claim 7, wherein controlling the opening or closing of the switching devices on the DC/DC modules to be connected to the electrical load according to the number and connection manner of the DC/DC modules to be connected to the electrical load, and implementing the wide DC output comprises:
when the DC/DC module to be connected with the electric load adopts a series connection mode:
switching devices on two input lines at the direct current input side of the C DC/DC modules to be connected with the electric load are closed;
among C DC/DC modules to be connected with an electric load, a switch device on a positive output line of a direct current output side of a 1 st DC/DC module is closed, a switch device on a negative output line of a direct current output side of the C th DC/DC module is closed, a switch device is connected between the positive output line of the C th DC/DC module and the negative output line of the C-1 st DC/DC module and is closed, and other switch devices on the direct current output side are opened, wherein C is more than or equal to 2 and less than or equal to C;
switching devices on two input lines of a direct current input side of the other DC/DC modules which are not connected with the electric load are disconnected with switching devices on two output lines of a direct current output side;
when the DC/DC module to be connected with the electric load adopts a parallel connection mode:
switching devices on two input lines at the direct current input side of the C DC/DC modules to be connected with the electric load are closed;
switching devices on two output lines at the direct current output side of the C DC/DC modules to be connected with the electric load are closed, and other switching devices are opened;
and the switching devices on the two input lines at the direct current input side and the switching devices on the two output lines at the direct current output side of the DC/DC module which is not connected with the electric load are disconnected.
10. A computer-readable storage medium, characterized in that the storage medium stores a computer program for performing the method of any of the preceding claims 6 to 9.
11. An electronic device, characterized in that the electronic device comprises:
a processor;
a memory for storing the processor-executable instructions;
the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method of any one of claims 6 to 9.
CN202111485103.8A 2021-12-07 2021-12-07 Wide direct current output power electronic interface device and wide direct current output method Pending CN114006366A (en)

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