CN107070247A - A kind of electric power electric transformer based on cascade connection multi-level - Google Patents

A kind of electric power electric transformer based on cascade connection multi-level Download PDF

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Publication number
CN107070247A
CN107070247A CN201710361284.0A CN201710361284A CN107070247A CN 107070247 A CN107070247 A CN 107070247A CN 201710361284 A CN201710361284 A CN 201710361284A CN 107070247 A CN107070247 A CN 107070247A
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CN
China
Prior art keywords
transformer
pressure side
low
electric power
pressure
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Pending
Application number
CN201710361284.0A
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Chinese (zh)
Inventor
姚文熙
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Zhejiang University ZJU
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Zhejiang University ZJU
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Priority to CN201710361284.0A priority Critical patent/CN107070247A/en
Publication of CN107070247A publication Critical patent/CN107070247A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

The invention discloses a kind of electric power electric transformer based on cascade connection multi-level, including high voltage variable flow module, high frequency transformer and low pressure current transformer；High frequency transformer is many core structures, and its high-pressure side has multiple windings, and low-pressure side only one of which winding, high-pressure side winding is wound on corresponding magnetic core, and low-pressure side winding will be connected after all magnetic cores and coiling of getting up with the input of low pressure current transformer；All high voltage variable flow modules bear high input voltage after being cascaded by input, the output end of high voltage variable flow module is then connected with corresponding high-pressure side winding, and the output end of low pressure current transformer then realizes that low pressure is exported.The low-pressure side of medium/high frequency transformer of the present invention, without middle leads, can significantly simplify the insulating Design of system only with a winding, be conducive to improving the power density of electric power electric transformer, be the practical solution key issue of electric power electric transformer.

Description

A kind of electric power electric transformer based on cascade connection multi-level
Technical field
The invention belongs to electric and electronic technical field, and in particular to a kind of power electronics transformation based on cascade connection multi-level Device.
Background technology
With substantial amounts of distribution type renewable energy device and energy storage device access power network, power network is wanted to its corollary equipment Ask and also gradually lifted.Wherein, it to the auxiliary facility that energy carries out active control and distribution can be it in the weight developed in the future Weight, electric power electric transformer technology has obtained the extensive concern of various circles of society as representative therein.It is used as traditional transformer Substitute, on the basis of the original electrical isolation of traditional transformer, voltage-regulation function, can add new energy access, nothing Work(compensation, dc source interface, frequency conversion output, the improvement quality of power supply, fault detect and recovery, monitoring and combined network communication etc. in real time Function.Therefore, the device is expected to as the nucleus equipment in future source of energy internet, but the manufacture skill of electric power electric transformer Art is not yet ripe at present, and converter topology complexity causes high cost, reliability and efficiency is low and the problems such as difficult insulation.
Electric power electric transformer mainly realizes two functions, and one is the control as requested realized to voltage and current, two It is the electrical isolation for realizing former secondary.Typical structure is as shown in figure 1, in power network high-pressure side, by high-vol by power network High pressure industrial-frequency alternating current be converted into high voltagehigh frequency alternating current, then using high frequency transformer decompression be low-voltage high-frequency alternating current, Low-voltage high-frequency alternating current is converted to by low pressure industrial-frequency alternating current by low pressure current transformer again.Equipment two ends in Fig. 1 can be three Cross streams or single phase ac or direct current；High frequency transformer portion can have a variety of connected modes, it is such as single around Group, Multiple coil, many magnetic cores or multiple transformers.
It is pressure-resistant limited due to semiconductor devices, will far from the voltage for meeting electric power electric transformer high pressure side converter Ask, high pressure side converter needs to realize by way of devices in series or topology cascade.The cascaded topology technology of main flow has Two kinds, one kind is modular multilevel technology (MMC), and the circuit topology of cascade does not include transformer, and general structure is still such as Fig. 1 institutes Show, using a high frequency transformer；Another is that current transformer is combined to the mode cascaded again, referred to as level with high frequency transformer Join multilevel converter (CHB).
The structure of cascade connection multi-level circuit is as shown in Figure 2.Pass through multiple transformer transimission powers, power compared to MMC, CHB Stream can obtain optimal devices use rate without flow through all series topologies.But this topological shortcoming is, excessive Transformer and Transformer Winding result in extremely difficult insulating Design.
The content of the invention
In view of above-mentioned, the invention provides a kind of electric power electric transformer based on cascade connection multi-level, it is high by reducing The winding quantity of frequency power transformer low-pressure side, can reduce the requirement to insulating Design.
A kind of electric power electric transformer based on cascade connection multi-level, including multiple high voltage variable flow modules, a high frequency transformation Device and a low pressure current transformer；The high frequency transformer is many core structures, and its high-pressure side has multiple windings, and low-pressure side only has One winding, high-pressure side winding is wound on corresponding magnetic core, low-pressure side winding by after all magnetic cores and coiling of getting up with low pressure The input connection of current transformer；All high voltage variable flow modules bear high input voltage, high voltage variable flow module after being cascaded by input Output end then connected with corresponding high-pressure side winding, the output end of low pressure current transformer then realizes that low pressure is exported.
If electric power electric transformer high-pressure side is DC supply input, high voltage variable flow module becomes flow module using DC/AC；If Electric power electric transformer high-pressure side inputs for alternating current, then high voltage variable flow module becomes flow module using AC/AC.
If electric power electric transformer low-pressure side is direct current electricity output, low pressure current transformer uses AC/DC current transformers；If electric power Electronic transformer low-pressure side is exchange electricity output, then low pressure current transformer uses AC/AC current transformers.
Due to needing to bear very high voltage between the low-pressure side winding and high-pressure side winding of high frequency transformer, this is to low pressure Have in the design of the insulating Design of side winding leads, especially creep age distance, it is proposed that very high requirement, traditional CHB circuits There are substantial amounts of low-pressure side winding leads, insulating Design is difficult, and is unfavorable for the raising of power density.Medium/high frequency transformer of the present invention Low-pressure side only with a winding, without middle leads, can significantly simplify the insulating Design of system, be conducive to improve electric power The power density of electronic transformer, is the practical solution key issue of electric power electric transformer.
Brief description of the drawings
Fig. 1 is the structural representation of conventional electric power electronic transformer.
Fig. 2 is the electric power electric transformer structural representation that high-pressure side is cascaded.
Fig. 3 is the structural representation of electric power electric transformer of the present invention.
Fig. 4 is the structural representation of high frequency transformer of the present invention.
Fig. 5 is the structural representation of high voltage variable flow module.
Fig. 6 is the structural representation of low pressure current transformer.
Embodiment
In order to more specifically describe the present invention, below in conjunction with the accompanying drawings and embodiment is to technical scheme It is described in detail.
As shown in figure 3, the electric power electric transformer of the invention based on cascade connection multi-level, including high-vol, low pressure become Flow device and high frequency transformer.
High pressure side converter is constituted using several unsteady flow module-cascades, and each module includes two ports, respectively such as Fig. 3 Middle P ends and S ends, wherein P ends, which cascade up, bears high pressure, S termination Transformer Windings.
Transformer uses many core structures, and there are multiple windings its high-pressure side, each to become flow module one winding of correspondence, each Winding one magnetic core of correspondence；Low-pressure side is a winding, and by all magnetic cores and coiling of getting up, transformer device structure is as shown in Figure 4.
High-pressure side therein can be direct current, then high voltage variable flow module is straight-alternation flow module (DC/AC)；High-pressure side Can be exchange, then each module is friendship-alternation flow module (AC/AC).
Low-pressure side therein can be direct current, then low-pressure side converter module be hand over-directly become flow module (AC/DC), low pressure Side can also be exchange, then low pressure side converter is friendship-alternation flow module (AC/AC).
Implementation below is so that high-pressure side, low-pressure side are direct current as an example, high-pressure side DC voltage 15kV, low-pressure side 400V。
High-pressure side uses multiple module-cascades, and the voltage for designing each module is 400V, then at least needs 38 module levels Certain voltage allowance is stayed in connection, design, selects 40 modules.
High voltage variable flow module circuit uses half-bridge structure, using power MOSFET as master control power component, each module Circuit as shown in figure 5, connection HVDC end PiWith high voltage side of transformer winding Si(wherein i represents i-th of module), function It is by DC voltage upiBe converted to high-frequency ac voltage usi。
The winding method of high frequency transformer is as shown in Figure 4, it is necessary to which using 40 magnetic cores, each magnetic core has a winding connection High-vol module, coiling low-pressure side winding after all magnetic cores are stacked.
Low pressure current transformer uses full bridge structure, as shown in fig. 6, using power MOSFET, connection low-pressure side winding T and low pressure DC terminal F, function is to realize the conversion between high-frequency ac and low-voltage direct.
The above-mentioned description to embodiment is understood that for ease of those skilled in the art and using the present invention. Person skilled in the art obviously can easily make various modifications to above-described embodiment, and described herein general Principle is applied in other embodiment without passing through performing creative labour.Therefore, the invention is not restricted to above-described embodiment, ability Field technique personnel are according to the announcement of the present invention, and the improvement made for the present invention and modification all should be in protection scope of the present invention Within.

Claims (3)

1. a kind of electric power electric transformer based on cascade connection multi-level, it is characterised in that：Including multiple high voltage variable flow modules, one High frequency transformer and a low pressure current transformer；The high frequency transformer is many core structures, and its high-pressure side has multiple windings, low Side only one of which winding is pressed, high-pressure side winding is wound on corresponding magnetic core, low-pressure side winding is by all magnetic cores and coiling of getting up The input with low pressure current transformer is connected afterwards；All high voltage variable flow modules bear high input voltage, high pressure after being cascaded by input The output end for becoming flow module is then connected with corresponding high-pressure side winding, and the output end of low pressure current transformer then realizes that low pressure is exported.
2. electric power electric transformer according to claim 1, it is characterised in that：If electric power electric transformer high-pressure side is straight Stream electricity input, then high voltage variable flow module is using DC/AC change flow modules；If electric power electric transformer high-pressure side inputs for alternating current, Then high voltage variable flow module becomes flow module using AC/AC.
3. electric power electric transformer according to claim 1, it is characterised in that：If electric power electric transformer low-pressure side is straight Electricity output is flowed, then low pressure current transformer uses AC/DC current transformers；If electric power electric transformer low-pressure side is exchange electricity output, low Volage current transformer uses AC/AC current transformers.
CN201710361284.0A 2017-05-19 2017-05-19 A kind of electric power electric transformer based on cascade connection multi-level Pending CN107070247A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107659196A (en) * 2017-11-13 2018-02-02 国网江苏省电力公司南通供电公司 Three port electric power electric transformers
CN112487742A (en) * 2020-10-27 2021-03-12 云南电网有限责任公司临沧供电局 Transformer modeling method suitable for pulse signal injection at low-voltage side of distribution transformer
WO2022160135A1 (en) * 2021-01-27 2022-08-04 华为技术有限公司 Isolation transformer and power converter

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100128498A1 (en) * 2007-07-25 2010-05-27 Danmarks Tekniske Universitet Switch mode pulse width modulated dc-dc converter with multiple power transformers
CN103427658A (en) * 2013-08-01 2013-12-04 南京南瑞继保电气有限公司 High-voltage DC-DC conversion device based on multi-winding transformer
CN103956911A (en) * 2014-05-05 2014-07-30 国家电网公司 Modularized H-bridge cascade multilevel mutual-balance power electronic transformer
WO2015078838A1 (en) * 2013-11-27 2015-06-04 Alstom Technology Ltd Device and method for dc/dc reversible conversion allowing an exchange of energy between two dc electric networks
CN207039464U (en) * 2017-05-19 2018-02-23 浙江大学 A kind of electric power electric transformer based on cascade connection multi-level

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100128498A1 (en) * 2007-07-25 2010-05-27 Danmarks Tekniske Universitet Switch mode pulse width modulated dc-dc converter with multiple power transformers
CN103427658A (en) * 2013-08-01 2013-12-04 南京南瑞继保电气有限公司 High-voltage DC-DC conversion device based on multi-winding transformer
WO2015078838A1 (en) * 2013-11-27 2015-06-04 Alstom Technology Ltd Device and method for dc/dc reversible conversion allowing an exchange of energy between two dc electric networks
CN103956911A (en) * 2014-05-05 2014-07-30 国家电网公司 Modularized H-bridge cascade multilevel mutual-balance power electronic transformer
CN207039464U (en) * 2017-05-19 2018-02-23 浙江大学 A kind of electric power electric transformer based on cascade connection multi-level

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107659196A (en) * 2017-11-13 2018-02-02 国网江苏省电力公司南通供电公司 Three port electric power electric transformers
CN112487742A (en) * 2020-10-27 2021-03-12 云南电网有限责任公司临沧供电局 Transformer modeling method suitable for pulse signal injection at low-voltage side of distribution transformer
CN112487742B (en) * 2020-10-27 2022-11-08 云南电网有限责任公司临沧供电局 Transformer modeling method suitable for pulse signal injection of low-voltage side of distribution transformer
WO2022160135A1 (en) * 2021-01-27 2022-08-04 华为技术有限公司 Isolation transformer and power converter

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