CN109818514A - It is a kind of can flexible allocation output port output capacity electric power electric transformer - Google Patents
It is a kind of can flexible allocation output port output capacity electric power electric transformer Download PDFInfo
- Publication number
- CN109818514A CN109818514A CN201910276387.6A CN201910276387A CN109818514A CN 109818514 A CN109818514 A CN 109818514A CN 201910276387 A CN201910276387 A CN 201910276387A CN 109818514 A CN109818514 A CN 109818514A
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- Prior art keywords
- output
- frequency
- electronic transformer
- power electronic
- phase
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Classifications
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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
-
- 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
- H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of AC power input into DC 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
- H02M7/217—Conversion of AC power input into DC 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
- H02M7/219—Conversion of AC power input into DC 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 in a bridge configuration
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Inverter Devices (AREA)
Abstract
本发明公开了一种可灵活分配输出端口输出容量的电力电子变压器，每相由X个单相电力电子变压器模块连接构成；每相的X个单相电力电子变压器模块的输入端并联；每个单相电力电子变压器模块的输入端连接单刀单掷开关；每个单相电力电子变压器模块的输出端连接单刀多掷开关，单刀多掷开关的另一侧分别接到不同电压等级的直流母线上。可根据接入的负载的大小灵活分配电力电子变压器对应输出端口的输出容量，通过调整电力电子变压器模块投退数量实现电力电子变压器容量的随需动态调整，通过调整纹波电容的投退数量实现纹波信号抑制效果的最大化，针对结构相同的功率模块、电力电子变压器模块等通用模块实现了模块化的互换及共享，实用性较好。
The invention discloses a power electronic transformer capable of flexibly distributing the output capacity of output ports. Each phase is formed by connecting X single-phase power electronic transformer modules; the input ends of the X single-phase power electronic transformer modules of each phase are connected in parallel; each The input end of the single-phase power electronic transformer module is connected to the single-pole single-throw switch; the output end of each single-phase power electronic transformer module is connected to the single-pole multi-throw switch, and the other side of the single-phase multi-throw switch is respectively connected to the DC bus of different voltage levels . The output capacity of the power electronic transformer corresponding to the output port can be flexibly allocated according to the size of the connected load, and the dynamic adjustment of the capacity of the power electronic transformer can be realized by adjusting the switching quantity of the power electronic transformer module, and the switching quantity of the ripple capacitor can be adjusted. To maximize the ripple signal suppression effect, modular interchange and sharing are realized for common modules such as power modules and power electronic transformer modules with the same structure, which is more practical.
Description
Technical Field
The embodiment of the invention relates to the technical field of power electronics, in particular to a power electronic transformer capable of flexibly distributing output capacity of an output port.
Background
The power electronic transformer has the functions of rectification, inversion, bidirectional control of power flow, control of electric energy quality, communication, information exchange and the like besides the functions of voltage grade conversion and electrical isolation of the traditional transformer. The device plays an irreplaceable important role in an intelligent power grid, an energy internet and a future alternating current-direct current interconnected power grid, and is also a core device for realizing electric energy conversion and processing.
However, in order to adapt to various application scenarios, the capacity of the load, the variability of the supply voltage, and the uncertainty of the new load, the output capacity of the output port of the existing power electronic transformer is usually determined according to the maximum demand, which results in the excess capacity of the power electronic transformer and the redundant capacity that cannot be flexibly distributed on each output port. This makes inside expensive, bulky, heat dissipation design complicated component, like IGBT, IGCT, MOSFET, condenser etc. still like general module such as MMC power module, will appear a large amount of idle circumstances, and the economic nature of transformer operation is not high, also is not favorable to reducing manufacturing cost.
Disclosure of Invention
The invention provides a power electronic transformer capable of flexibly distributing output capacity of an output port, which aims to overcome the defects of the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a power electronic transformer capable of flexibly distributing output capacity of an output port is characterized in that each phase of the power electronic transformer is formed by connecting X single-phase power electronic transformer modules, wherein X is a positive integer; the input ends of the X single-phase power electronic transformer modules of each phase are in a parallel structure; the input end of each single-phase power electronic transformer module is connected with a single-pole single-throw switch; the output end of each single-phase power electronic transformer module is connected with a single-pole multi-throw switch, the other side of each single-pole multi-throw switch is respectively connected to direct-current buses with different voltage grades, and each direct-current bus can be directly connected with an output port to output a direct-current power supply with certain voltage and certain capacity or is connected to an output port to output an alternating-current power supply with certain voltage and certain capacity after passing through an inverter; each phase output end of the inverter is connected with a plurality of filter capacitors in parallel, and the filter capacitors are controlled by corresponding single-pole single-throw switches; wherein,
each single-phase power electronic transformer module is formed by connecting Y power modules with the same structure, and Y is a positive integer;
the input ends of the Y power modules are in a series structure; the input end and the output end of each power module are connected with a single-pole single-throw switch;
each power module consists of an AC/DC rectifying unit and a high-frequency DC/DC direct-current conversion unit, wherein the output end of the AC/DC rectifying unit is connected with the input end of the high-frequency DC/DC direct-current conversion unit, the output end of the high-frequency DC/DC direct-current conversion unit is connected with a plurality of filter capacitors in parallel, and the filter capacitors are controlled by corresponding single-pole single-throw switches.
Further, in the power electronic transformer capable of flexibly allocating output capacity of the output port, the primary side of the power module is a circuit formed by the AC/DC rectifying unit and the primary side circuit of the high-frequency DC/DC converting unit, and the secondary side of the power module is a secondary side circuit of the high-frequency DC/DC converting unit.
Furthermore, in the power electronic transformer capable of flexibly allocating output capacity of the output port, the input ends of the plurality of AC/DC rectifying units are connected to an AC power grid in series, the output ends of the AC/DC rectifying units are connected to the input ends of the high-frequency DC/DC converting units, and the output ends of the high-frequency DC/DC converting units are connected in parallel for output.
Furthermore, in the power electronic transformer capable of flexibly distributing the output capacity of the output port, the AC/DC rectifying unit comprises a controllable full-bridge rectifying circuit and an energy storage capacitor, wherein the controllable full-bridge rectifying circuit is composed of four IGBTs with anti-parallel diodes.
Furthermore, in the power electronic transformer capable of flexibly distributing the output capacity of the output port, the AC/DC rectifying unit is connected to the high-frequency DC/DC converting unit through a filter capacitor.
Further, in the power electronic transformer capable of flexibly distributing output capacity of the output port, the high-frequency DC/DC direct current conversion unit comprises a high-frequency full-bridge inverter circuit consisting of four IGBTs with anti-parallel diodes, a resonant capacitor, a high-frequency transformer and a low-frequency full-bridge inverter circuit consisting of four IGBTs with anti-parallel diodes, wherein the input end of the high-frequency full-bridge inverter circuit is connected with the output end of the AC/DC rectification unit, the output end of the high-frequency full-bridge inverter circuit is connected in series with the resonant capacitor and then connected with the primary side of the high-frequency transformer, the secondary side of the high-frequency transformer is connected with the input end of the low-frequency full-bridge inverter circuit, and the output end of the low-frequency full-bridge inverter circuit is connected with the single-.
Further, in the power electronic transformer capable of flexibly allocating output capacity of the output port, the single-pole single-throw switch connected to the input end of each power module is used as a bypass switch for bypassing the current power module according to a bypass requirement.
Furthermore, in the power electronic transformer capable of flexibly allocating the output capacity of the output port, the filter capacitors connected in parallel to each phase output end of the inverter and the output end of the high-frequency DC/DC conversion unit have different or the same size.
According to the technical scheme provided by the invention, the output capacity of the corresponding output port of the power electronic transformer can be flexibly distributed according to the size of the accessed load, the capacity of the power electronic transformer can be dynamically adjusted as required by adjusting the on-off number of the modules of the power electronic transformer, the ripple signal suppression effect can be maximized by adjusting the on-off number of the ripple capacitors, the modularized interchange and sharing are realized for general modules with the same structure, such as power modules, power electronic transformer modules and the like, and the practicability is better.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a power electronic transformer capable of flexibly allocating output capacity of an output port according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of each single-phase power electronic transformer module according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an inverter according to an embodiment of the present invention.
Reference numerals:
single pole single throw switch 10, single pole multiple throw switch 20;
the high-frequency DC/DC converter comprises an AC/DC rectifying unit 100, a high-frequency DC/DC direct current converting unit 200, a single-pole single-throw switch 300, a single-pole single-throw switch 400 and a single-pole single-throw switch 500.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.
Furthermore, the terms "long", "short", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention, but do not indicate or imply that the referred devices or elements must have the specific orientations, be configured to operate in the specific orientations, and thus are not to be construed as limitations of the present invention.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Example one
Fig. 1 is a schematic structural diagram of a power electronic transformer capable of flexibly allocating output capacity of an output port according to an embodiment of the present invention. As shown in fig. 1, each phase of the power electronic transformer is formed by connecting X single-phase power electronic transformer modules, where X is a positive integer; the input ends of the X single-phase power electronic transformer modules of each phase are in a parallel structure; the input end of each single-phase power electronic transformer module is connected with a single-pole single-throw switch 10; the output end of each single-phase power electronic transformer module is connected with a single-pole multi-throw switch 20, the other side of the single-pole multi-throw switch 20 is respectively connected to direct-current buses (the number of the direct-current buses can be n) with different voltage grades, the direct-current buses can be directly connected with the output port to output direct-current power supplies with certain voltage and certain capacity, or the direct-current buses are connected with the output port to output alternating-current power supplies with certain voltage and certain capacity after passing through an inverter (the number of the inverters can be n, and n alternating-current outputs are correspondingly provided); each phase output end of the inverter is connected with a plurality of filter capacitors in parallel, the filter capacitors are controlled by corresponding single-pole single-throw switches, and the specific structure can refer to the attached figure 3; wherein,
each single-phase power electronic transformer module is formed by connecting Y power modules with the same structure, wherein Y is a positive integer, and the specific structure can refer to the attached figure 2.
In fig. 2, the input terminals of Y power modules are in a series structure; the input end of each power module is connected with a single-pole single-throw switch 500, and the output end of each power module is connected with a single-pole single-throw switch 300;
it should be noted that the single-pole single-throw switch 500 connected to the input terminal of each power module is used as a bypass switch for bypassing the current power module according to the bypass requirement.
In this embodiment, each power module is composed of an AC/DC rectifying unit 100 and a high-frequency DC/DC converting unit 200, an output terminal of the AC/DC rectifying unit 100 is connected to an input terminal of the high-frequency DC/DC converting unit 200, and an output terminal of the high-frequency DC/DC converting unit 200 is connected in parallel with a plurality of filter capacitors, and the filter capacitors are controlled by a corresponding single-pole single-throw switch 400.
It should be noted that, the sizes of each filter capacitor connected in parallel to the output end of each phase of the inverter and the output end of the high-frequency DC/DC conversion unit 200 are different or the same; in addition, the AC/DC rectifying unit 100 or the high frequency DC/DC converting unit 200 or the whole power module or the whole single-phase power electronic transformer module can be replaced in a modularized way.
In this embodiment, the primary side of the power module is a circuit formed by the AC/DC rectifying unit 100 and the primary side circuit of the high-frequency DC/DC converting unit 200, and the secondary side of the power module is a secondary side circuit of the high-frequency DC/DC converting unit 200.
Specifically, the input ends of the AC/DC rectifying units 100 are connected to an AC power grid in series, the output ends of the AC/DC rectifying units are connected to the input end of the high-frequency DC/DC converting unit 200, and the output ends of the high-frequency DC/DC converting unit are connected in parallel for output.
More specifically, the AC/DC rectifying unit includes a controllable full-bridge rectifying circuit composed of four IGBTs (or IGCTs) with anti-parallel diodes, and an energy storage capacitor.
Preferably, the AC/DC rectifying unit is connected to the high frequency DC/DC converting unit 200 through a filter capacitor.
Specifically, the high frequency DC/DC conversion unit includes a high frequency full bridge inverter circuit composed of four IGBTs with anti-parallel diodes (IGCTs are also available), a resonant capacitor, a high frequency transformer, and a low frequency full bridge inverter circuit composed of four IGBTs with anti-parallel diodes (IGCTs are also available), wherein the input end of the high frequency full bridge inverter circuit is connected to the output end of the AC/DC rectification unit 100, the output end of the high frequency full bridge inverter circuit is connected in series to the primary side of the high frequency transformer, the secondary side of the high frequency transformer is connected to the input end of the low frequency full bridge inverter circuit, and the output end of the low frequency full bridge inverter circuit is connected in parallel to the plurality of filter capacitors and then connected to the single-pole single-throw switch 300.
According to the technical scheme provided by the invention, the output capacity of the corresponding output port of the power electronic transformer can be flexibly distributed according to the size of the accessed load, the capacity of the power electronic transformer can be dynamically adjusted as required by adjusting the on-off number of the modules of the power electronic transformer, the ripple signal suppression effect can be maximized by adjusting the on-off number of the ripple capacitors, the modularized interchange and sharing are realized for general modules with the same structure, such as power modules, power electronic transformer modules and the like, and the practicability is better.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; 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 (8)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910276387.6A CN109818514A (en) | 2019-04-08 | 2019-04-08 | It is a kind of can flexible allocation output port output capacity electric power electric transformer |
| PCT/CN2019/094335 WO2020206851A1 (en) | 2019-04-08 | 2019-07-02 | Power electronic transformer capable of flexibly distributing output-port output capacity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910276387.6A CN109818514A (en) | 2019-04-08 | 2019-04-08 | It is a kind of can flexible allocation output port output capacity electric power electric transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109818514A true CN109818514A (en) | 2019-05-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910276387.6A Pending CN109818514A (en) | 2019-04-08 | 2019-04-08 | It is a kind of can flexible allocation output port output capacity electric power electric transformer |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109818514A (en) |
| WO (1) | WO2020206851A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020206851A1 (en) * | 2019-04-08 | 2020-10-15 | 广东电网有限责任公司 | Power electronic transformer capable of flexibly distributing output-port output capacity |
| CN112117776A (en) * | 2019-06-21 | 2020-12-22 | 台达电子企业管理（上海）有限公司 | Charging station system based on solid-state transformer |
| CN112953239A (en) * | 2021-03-04 | 2021-06-11 | 广东电网有限责任公司 | Topological structure of DC-DC converter |
| CN113037107A (en) * | 2021-03-04 | 2021-06-25 | 广东电网有限责任公司 | Topological structure of power electronic transformer |
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| JP2011188676A (en) * | 2010-03-10 | 2011-09-22 | Mitsubishi Electric Corp | Power supply |
| CN105245035A (en) * | 2015-11-04 | 2016-01-13 | 华东交通大学 | Frequency changer circuit based on magnetic resonance coupling wireless power transmission |
| CN105450038A (en) * | 2015-12-29 | 2016-03-30 | 中国电力科学研究院 | Modular H bridge cascade multi-level power electronic transformer control system |
| CN105939106A (en) * | 2015-03-04 | 2016-09-14 | 英飞凌科技奥地利有限公司 | Multi-cell power conversion method with failure detection and multi-cell power converter |
| CN108599540A (en) * | 2018-05-17 | 2018-09-28 | 华中科技大学 | A kind of redundancy structure of cascaded H-bridges Three-phase electronic power transformer |
| CN208353223U (en) * | 2018-07-26 | 2019-01-08 | 广东电网有限责任公司 | Power electronic transformer with adjustable port output capacity |
| CN209948988U (en) * | 2019-04-08 | 2020-01-14 | 广东电网有限责任公司 | Power electronic transformer capable of flexibly distributing output capacity of output port |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109818514A (en) * | 2019-04-08 | 2019-05-28 | 广东电网有限责任公司 | It is a kind of can flexible allocation output port output capacity electric power electric transformer |
-
2019
- 2019-04-08 CN CN201910276387.6A patent/CN109818514A/en active Pending
- 2019-07-02 WO PCT/CN2019/094335 patent/WO2020206851A1/en not_active Ceased
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011188676A (en) * | 2010-03-10 | 2011-09-22 | Mitsubishi Electric Corp | Power supply |
| CN105939106A (en) * | 2015-03-04 | 2016-09-14 | 英飞凌科技奥地利有限公司 | Multi-cell power conversion method with failure detection and multi-cell power converter |
| CN105245035A (en) * | 2015-11-04 | 2016-01-13 | 华东交通大学 | Frequency changer circuit based on magnetic resonance coupling wireless power transmission |
| CN105450038A (en) * | 2015-12-29 | 2016-03-30 | 中国电力科学研究院 | Modular H bridge cascade multi-level power electronic transformer control system |
| CN108599540A (en) * | 2018-05-17 | 2018-09-28 | 华中科技大学 | A kind of redundancy structure of cascaded H-bridges Three-phase electronic power transformer |
| CN208353223U (en) * | 2018-07-26 | 2019-01-08 | 广东电网有限责任公司 | Power electronic transformer with adjustable port output capacity |
| CN209948988U (en) * | 2019-04-08 | 2020-01-14 | 广东电网有限责任公司 | Power electronic transformer capable of flexibly distributing output capacity of output port |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020206851A1 (en) * | 2019-04-08 | 2020-10-15 | 广东电网有限责任公司 | Power electronic transformer capable of flexibly distributing output-port output capacity |
| CN112117776A (en) * | 2019-06-21 | 2020-12-22 | 台达电子企业管理（上海）有限公司 | Charging station system based on solid-state transformer |
| CN112953239A (en) * | 2021-03-04 | 2021-06-11 | 广东电网有限责任公司 | Topological structure of DC-DC converter |
| CN113037107A (en) * | 2021-03-04 | 2021-06-25 | 广东电网有限责任公司 | Topological structure of power electronic transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020206851A1 (en) | 2020-10-15 |
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