CN203014686U - An electronic power transformer - Google Patents
An electronic power transformer Download PDFInfo
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- CN203014686U CN203014686U CN 201320023614 CN201320023614U CN203014686U CN 203014686 U CN203014686 U CN 203014686U CN 201320023614 CN201320023614 CN 201320023614 CN 201320023614 U CN201320023614 U CN 201320023614U CN 203014686 U CN203014686 U CN 203014686U
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- high frequency
- pressure side
- power conversion
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Abstract
The utility model provides an electronic power transformer comprising a modularized multi-level rectifier, an isolating stage, and an inverter. The modularized multi-level rectifier comprises multiple sub-modules. The inverter comprises multiple power converting modules interconnected in parallel. The electronic power transformer has good expandability because the modularized multi-level rectifier comprises multiple same sub-modules and the inverter comprises multiple same power converting modules. According to the requirement of an application, the electronic power transformer can be easily expanded to a high voltage grade and a high power level. The electronic power transformer is capable of flexibly controlling the bidirectional flow of active power and reactive power and is capable of guaranteeing systems at two sides to be equipped with good electric energy quality. The electronic power transformer has a simple structure and strong expandability and is capable of achieving bidirectional flow control of the active power and the reactive power.
Description
Technical field
The utility model relates to technical field of power systems, particularly relates to electronic power transformer.
Background technology
Power transformer is the most basic component devices of electric power system, plays a very important role in transmission system.At present, the power transformer of electric power system is commonly used is to adopt oil filled electrical transformer unshakable in one's determination.It has simple in structure, and reliability is high, the advantages such as low cost of manufacture.But also there is following shortcoming in it, and first: volume of transformer is large, Heavy Weight; Second: can not keep transformer pair side voltage constant; The the 3rd: due to the nonlinear characteristic of ferromagnetic element, when magnetic saturation appears in transformer core, can cause the wave distortion of electric current and voltage in system, produce harmonic pollution; The 4th: because close-coupled and former side's electric current of transformer pair side's voltage waveform and former side's voltage waveform is decided by load current, so the power quality problem of grid side and load side can be propagated mutually; The 5th: the regulation and control to voltage is limited in one's ability.
In recent years, more and more technical staff put into the research to electronic power transformer both at home and abroad, electronic power transformer is a kind of transformation of electrical energy and transmission equipment that adopts the Technics of Power Electronic Conversion technology, and its basic principle is that the employing High Power Electronic Converter Technology is realized the voltage transformation in electric power system.It has following advantage: 1, the electronic power transformer volume is little with respect to oil filled electrical transformer unshakable in one's determination, and is lightweight, non-environmental-pollution, easy care; Can keep secondary side's output voltage amplitude and frequency constant when 2, transformer moves, not with load variations; 3, transformer has high controllability, can the smooth adjustment that realize under carrier strip spare amplitude and frequency arranged.
Up to the present, the researcher has proposed multiple concrete implementation both at home and abroad, these implementations have advantages of separately, but when being applied to the high-tension high-power occasion, power electronic device is had higher requirement, control for the two-way flow that realizes active power and reactive power, it is complicated that general electronic power transformer structure becomes, design difficulty strengthens, poor expandability.
Summary of the invention
Based on this, be necessary for the baroque problem of existing electronic power transformer, provide a kind of simple in structure, extensibility strong and can realize electronic power transformer that the two-way flow of active power and reactive power is controlled.
A kind of electronic power transformer, comprise modular multilevel rectifier, isolation level and inverter, the interchange end of described modular multilevel rectifier is connected with electrical network, the dc terminal of described modular multilevel rectifier is connected with the high-pressure side port of described isolation level, the dc terminal of described inverter is connected with the low-pressure side port of described isolation level, and the interchange end of described inverter is connected with transmission line or load;
Described modular multilevel rectifier is three-phase three bridge arm circuit structures, in described three bridge arm structures, every phase brachium pontis includes brachium pontis and lower brachium pontis, described upper brachium pontis and described lower brachium pontis comprise a plurality of submodules, described a plurality of submodule series connection, described submodule comprises half-bridge circuit and electric capacity, described half-bridge circuit and described Capacitance parallel connection;
Described inverter comprises three single phase circuits, described three single phase circuits are pressed three-phase four-wire system and are connected, described three single phase circuits comprise a plurality of power conversion modules, the connection parallel with one another of described a plurality of power conversion module AC, and described power conversion module is the full-controlled rectifier bridge.
In embodiment, the described upper brachium pontis of modular multilevel rectifier and described lower brachium pontis also comprise respectively buffer inductance therein, and described buffer inductance is connected with described a plurality of submodules.
Therein in embodiment, described isolation level comprises high frequency modulated part, high frequency transformer group part and high frequency reduction part, described high frequency modulated is partly the high-pressure side of described isolation level, described high frequency reduction part is the low-pressure side of described isolation level, described high frequency transformer group part and is connected with described high frequency modulated part, described high frequency reduction part between described high frequency modulated part and described high frequency reduction part.
Therein in embodiment, described high frequency modulated partly comprises 3P described power conversion module, wherein P is positive integer, P described power conversion module connected successively, the DC port of P described power conversion module formation isolation level high-pressure side port after series connection, described isolation level high-pressure side port is connected with described modular multilevel rectifier, and the interchange port of P described power conversion module is connected with the high-pressure side winding of described high frequency transformer group part.
Therein in embodiment, described high frequency transformer group partly comprises 3 high frequency transformers, the high-pressure side of each described high frequency transformer is single winding, low-pressure side is Q described winding, wherein Q is positive integer, described high frequency reduction part comprises 3Q described power conversion module, the described power conversion module of 3Q exchanges end and is connected with Q winding of the low-pressure side of 3 described high frequency converters respectively, the dc terminal of 3Q described power conversion module forms isolation level low-pressure side port, and described isolation level low-pressure side port is connected with described inverter;
In described inverter, three described single phase circuits comprise respectively Q power conversion module, and Q described power conversion module exchanges end connection parallel with one another, and 3Q described power conversion module dc terminal is connected with described isolation level low-pressure side port.
Therein in embodiment, described high frequency transformer group partly comprises 3P described high frequency transformer, wherein P is positive integer, each described high frequency transformer high-pressure side and low-pressure side are single winding, described high frequency reduction part comprises 3P power conversion module, 3P described power conversion module AC is connected with the low-pressure side winding of 3P double winding high frequency transformer respectively, the dc terminal of 3P described power conversion module forms isolation level low-pressure side port, and described isolation level low-pressure side port is connected with described inverter;
In described inverter, three described single phase circuits comprise respectively P described power conversion module, the interchange end connection parallel with one another of P described power conversion module, and the DC port of 3P described power conversion module is connected with isolation level low-pressure side port.
the alternating current of input the utility model electronic power transformer is transformed to direct current by the modular multilevel rectifier of three-phase three bridge arm structures, be modulated into as being loaded on high frequency transformer after high frequency square wave by inverter circuit again, be coupled to the transformer secondary rear flank, high frequency square wave is rectified into direct voltage, another mistake becomes required alternating current output, because every phase brachium pontis of modular multi-level converter comprises a plurality of identical submodules, inverter comprises that a plurality of identical power conversion modules form, thereby be with good expansibility, can be according to the needs of using, expand to easily very high electric pressure and power level, in addition, the utility model can realize controlling neatly the two-way flow of active power and reactive power, and can guarantee that two side systems have the good quality of power supply.So to be a kind of simple in structure, autgmentability strong and the power transformer that can realize the two-way flow of active power and reactive power is controlled for the utility model electronic power transformer.
Description of drawings
Fig. 1 is the structural representation of one of them embodiment of the utility model electronic power transformer;
Fig. 2 is the first structural representation of isolation level in the utility model electronic power transformer;
Fig. 3 is the second structural representation of isolation level in the utility model electronic power transformer.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below reach with reference to the accompanying drawings embodiment, the utility model is further elaborated.Should be appreciated that concrete enforcement described herein only in order to explain the utility model, does not limit the utility model.
As shown in Figure 1, a kind of electronic power transformer, comprise modular multilevel rectifier 100, isolation level 200 and inverter 300, the interchange end of described modular multilevel rectifier 100 is connected with electrical network, the dc terminal of described modular multilevel rectifier 100 is connected with the high-pressure side port of described isolation level 200, the dc terminal of described inverter 300 is connected with the low-pressure side port of described isolation level 200, and the interchange end of described inverter 300 is connected with transmission line or load;
Described modular multilevel rectifier 100 is three-phase three bridge arm circuit structures, in described three bridge arm structures, every phase brachium pontis includes brachium pontis and lower brachium pontis, described upper brachium pontis and described lower brachium pontis include a plurality of identical submodules, described a plurality of submodule series connection, described submodule comprises half-bridge circuit and electric capacity, described half-bridge circuit and described Capacitance parallel connection;
Described inverter 300 comprises three single phase circuits, described three single phase circuits are pressed three-phase four-wire system and are connected, described three single phase circuits comprise a plurality of equal-wattage conversion modules, the connection parallel with one another of described a plurality of power conversion module AC, and described power conversion module is the full-controlled rectifier bridge.
Described a plurality of number that refers to more than 2 or 2 here.
the alternating current of input the utility model electronic power transformer is transformed to direct current by the modular multilevel rectifier of three-phase three bridge arm structures, be modulated into as being loaded on high frequency transformer after high frequency square wave by inverter circuit again, be coupled to the transformer secondary rear flank, high frequency square wave is rectified into direct voltage, another mistake becomes required interchange output, because every phase brachium pontis of modular multi-level converter is comprised of a plurality of submodules, have in inverter and comprise a plurality of power models, thereby be with good expansibility, can be according to the needs of using, expand to easily very high electric pressure and power level, can realize controlling neatly the two-way flow of active power and reactive power, and can guarantee electronic power transformer one, the quality of power supply that secondary side is good.So to be a kind of simple in structure, autgmentability strong and the electronic power transformer that can realize the two-way flow of active power and reactive power is controlled for the utility model electronic power transformer.
In addition due to the modularized design of modular multilevel rectifier, can obtain higher level number, thereby reduced the alternating current-direct current harmonic component, corresponding filter capacity and volume also can reduce, thereby have further simplified the structure of the utility model electronic power transformer.
In embodiment, described upper brachium pontis and described lower brachium pontis also comprise respectively buffer inductance therein, and described buffer inductance is connected with described a plurality of submodules.
Here buffer inductance being connected with a plurality of submodules is the effect of a filtering, and in general only a buffer inductance need to be connected with a plurality of submodules here just to reach good filter effect.
Therein in embodiment, described isolation level comprises high frequency modulated part, high frequency transformer group part and high frequency reduction part, described high frequency modulated is partly the high-pressure side of described isolation level, described high frequency reduction part is the low-pressure side of described isolation level, described high frequency transformer group part and is connected with described high frequency modulated part, described high frequency reduction part between described high frequency modulated part and described high frequency reduction part.
The electric current that enters isolation level is transferred in inverter through the processing of high frequency modulated part, high frequency transformer group part and high frequency reduction part successively.
Isolation level is divided into the part of three difference in functionalitys, can with the utility model electronic power transformer internal structure modularization, functionalization, can simplify like this utility model electronic power transformer structure.
Therein in embodiment, described high frequency modulated partly comprises 3P described power conversion module, wherein P is positive integer, P described power conversion module connected successively, the DC port of P described power conversion module formation isolation level high-pressure side port after series connection, described isolation level high-pressure side port is connected with described modular multilevel rectifier, and the interchange port of P described power conversion module is connected with the high-pressure side winding of described high frequency transformer group part.
Here 3P power conversion module refers to 3 P group time power conversion modules, and high frequency modulated comprises that partly 3P power conversion module has good autgmentability, can determine according to the needs that reality is used the size of P.
As shown in Figure 2, therein in embodiment, described high frequency transformer group partly comprises 3 high frequency transformers, the high-pressure side of each described high frequency transformer is single winding, low-pressure side is Q described winding, wherein Q is positive integer, described high frequency reduction part comprises 3Q described power conversion module, the described power conversion module of 3Q exchanges end and is connected with Q winding of the low-pressure side of 3 described high frequency converters respectively, the dc terminal of 30 described power conversion modules forms isolation level low-pressure side port, and described isolation level low-pressure side port is connected with described inverter;
In described inverter, three described single phase circuits comprise respectively Q power conversion module, and Q described power conversion module exchanges end connection parallel with one another, and 3Q described power conversion module dc terminal is connected with described isolation level low-pressure side port.
In the present embodiment, in described electronic power transformer isolation level, the high frequency transformer low-pressure side has comprised Q winding, when the electronic power transformer of this isolation level structure is applied to the high-power occasion, can adopt less high frequency transformer.
As shown in Figure 3, therein in embodiment, described high frequency transformer group partly comprises 3P described high frequency transformer, wherein P is positive integer, each described high frequency transformer high-pressure side and low-pressure side are single winding, described high frequency reduction part comprises 3P power conversion module, 3P described power conversion module AC is connected with the low-pressure side winding of 3P double winding high frequency transformer respectively, the dc terminal of 3P described power conversion module forms isolation level low-pressure side port, and described isolation level low-pressure side port is connected with described inverter;
In described inverter, three described single phase circuits comprise respectively P described power conversion module, the interchange end connection parallel with one another of P described power conversion module, and the DC port of 3P described power conversion module is connected with isolation level low-pressure side port.
The present embodiment is the another kind of structure of isolation level in the utility model electronic power transformer, in the electronic power transformer isolation level, the high frequency transformer low-pressure side includes only a winding, when the electronic power transformer of this isolation level structure is applied to the high-power occasion, be easy to the power conversion module is expanded.
Below, will explain the technical solution of the utility model with example.
Example: 10kV/400V, step-down transformer
The modular multilevel rectifier is every to be comprised of level power conversion module more than 6 grades; Isolation level also is comprised of the power conversion module of corresponding progression by the high frequency modulated part of hiigh pressure stage side, the IGBT module composition that each module is 3300V by two rated voltages, and by this one-level, direct voltage is modulated into high frequency square wave; Isolation level is by the every IGBT module composition that is 3300V by 1 rated voltage of high frequency reduction part of low-pressure side, and by this one-level, high frequency square wave is reduced into direct voltage.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.Should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (6)
1. electronic power transformer, it is characterized in that, comprise modular multilevel rectifier, isolation level and inverter, the interchange end of described modular multilevel rectifier is connected with electrical network, the dc terminal of described modular multilevel rectifier is connected with the high-pressure side port of described isolation level, the dc terminal of described inverter is connected with the low-pressure side port of described isolation level, and the interchange end of described inverter is connected with transmission line or load;
Described modular multilevel rectifier is three-phase three bridge arm circuit structures, in described three bridge arm structures, every phase brachium pontis includes brachium pontis and lower brachium pontis, described upper brachium pontis and described lower brachium pontis include a plurality of submodules, described a plurality of submodule series connection, described submodule comprises half-bridge circuit and electric capacity, described half-bridge circuit and described Capacitance parallel connection;
Described inverter comprises three single phase circuits, described three single phase circuits are pressed three-phase four-wire system and are connected, described three single phase circuits comprise a plurality of power conversion modules, the connection parallel with one another of described a plurality of power conversion modules, and described power conversion module is the full-controlled rectifier bridge.
2. electronic power transformer according to claim 1, is characterized in that, described upper brachium pontis and described lower brachium pontis also comprise respectively buffer inductance, and described buffer inductance is connected with described a plurality of submodules.
3. electronic power transformer according to claim 1 and 2, it is characterized in that, described isolation level comprises high frequency modulated part, high frequency transformer group part and high frequency reduction part, described high frequency modulated is partly the high-pressure side of described isolation level, described high frequency reduction part is the low-pressure side of described isolation level, described high frequency transformer group part and is connected with described high frequency modulated part, described high frequency reduction part between described high frequency modulated part and described high frequency reduction part.
4. electronic power transformer according to claim 3, it is characterized in that, described high frequency modulated partly comprises 3P described power conversion module, wherein P is positive integer, P described power conversion module connected successively, the dc terminal of P described power conversion module formation isolation level high-pressure side port after series connection, described isolation level high-pressure side port is connected with described modular multilevel rectifier, and the interchange end of P described power conversion module is connected with the high-pressure side winding of described high frequency transformer group part.
5. electronic power transformer according to claim 4, it is characterized in that, described high frequency transformer group partly comprises 3 high frequency transformers, the high-pressure side of each described high frequency transformer is single winding, low-pressure side is Q described winding, wherein Q is positive integer, described high frequency reduction part comprises 3Q described power conversion module, the described power conversion module of 3Q exchanges end and is connected with Q winding of the low-pressure side of 3 described high frequency converters respectively, the dc terminal of 3Q described power conversion module forms isolation level low-pressure side port, described isolation level low-pressure side port is connected with described inverter,
In described inverter, three described single phase circuits comprise respectively Q power conversion module, and Q described power conversion module exchanges end connection parallel with one another, and 3Q described power conversion module dc terminal is connected with described isolation level low-pressure side port.
6. electronic power transformer according to claim 4, it is characterized in that, described high frequency transformer group partly comprises 3P described high frequency transformer, wherein P is positive integer, each described high frequency transformer high-pressure side and low-pressure side are single winding, described high frequency reduction part comprises 3P power conversion module, 3P described power conversion module AC is connected with the low-pressure side winding of 3P double winding high frequency transformer respectively, the dc terminal of 3P described power conversion module forms isolation level low-pressure side port, described isolation level low-pressure side port is connected with described inverter,
In described inverter, three described single phase circuits comprise respectively P described power conversion module, the interchange end connection parallel with one another of P described power conversion module, and the dc terminal of 3P described power conversion module is connected with isolation level low-pressure side port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320023614 CN203014686U (en) | 2013-01-16 | 2013-01-16 | An electronic power transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320023614 CN203014686U (en) | 2013-01-16 | 2013-01-16 | An electronic power transformer |
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| CN203014686U true CN203014686U (en) | 2013-06-19 |
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| CN 201320023614 Withdrawn - After Issue CN203014686U (en) | 2013-01-16 | 2013-01-16 | An electronic power transformer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103036451A (en) * | 2013-01-16 | 2013-04-10 | 广东电网公司电力科学研究院 | Electronic power transformer |
| CN104283436A (en) * | 2014-09-24 | 2015-01-14 | 华中科技大学 | Combined type MMC type direct current transformer based on transformer coupling |
| CN111983501A (en) * | 2020-08-26 | 2020-11-24 | 广东电网有限责任公司电力科学研究院 | Modular energy feedback type AC/DC virtual load |
-
2013
- 2013-01-16 CN CN 201320023614 patent/CN203014686U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103036451A (en) * | 2013-01-16 | 2013-04-10 | 广东电网公司电力科学研究院 | Electronic power transformer |
| CN104283436A (en) * | 2014-09-24 | 2015-01-14 | 华中科技大学 | Combined type MMC type direct current transformer based on transformer coupling |
| CN111983501A (en) * | 2020-08-26 | 2020-11-24 | 广东电网有限责任公司电力科学研究院 | Modular energy feedback type AC/DC virtual load |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130619 Effective date of abandoning: 20150422 |