CN101795072A - High-voltage direct-current direct-current (HVDC-DC) power electronic converter transformer - Google Patents

High-voltage direct-current direct-current (HVDC-DC) power electronic converter transformer Download PDF

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Publication number
CN101795072A
CN101795072A CN201010117551A CN201010117551A CN101795072A CN 101795072 A CN101795072 A CN 101795072A CN 201010117551 A CN201010117551 A CN 201010117551A CN 201010117551 A CN201010117551 A CN 201010117551A CN 101795072 A CN101795072 A CN 101795072A
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China
Prior art keywords
switch
transformer
brachium pontis
frequency
voltage
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Pending
Application number
CN201010117551A
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Chinese (zh)
Inventor
李子欣
王平
李耀华
刘丛伟
朱海滨
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Institute of Electrical Engineering of CAS
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Institute of Electrical Engineering of CAS
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Priority to CN201010117551A priority Critical patent/CN101795072A/en
Publication of CN101795072A publication Critical patent/CN101795072A/en
Pending legal-status Critical Current

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    • H02M1/0095
    • H02M7/4835

Abstract

The invention relates to a high-voltage direct-current direct-current (HVDC-DC) power electronic converter transformer comprising a cascade modular converter (1), a double-winding medium or high-frequency transformer (2) and a fully-controlled H bridge (3). The cascade modular converter (1) consists of two same bridge arms, and the two bridge arms are formed by connecting the same number of sub-modules end to end in a cascading way; the middle points of both the two bridge arms are respectively connected with two leads of the primary side of the double-winding medium or high-frequency transformer (2); and the secondary side of the double-winding medium or high-frequency transformer (2) is directly connected with the fully-controlled H bridge (3) or is connected in series with a resonant capacitor (5) between the double-winding medium or high-frequency transformer (2) and the fully-controlled H bridge (3). The HVDC-DC power electronic converter transformer can realize the conversion of the high-voltage DC voltage and the low-voltage DC voltage and has the electrical isolation function. Compared with the prior HVDC-DC converting device, the HVDC-DC power electronic converter transformer has the advantages of small volume and light weight.

Description

A kind of high voltage direct current-direct current power electronic transformer
Technical field
The present invention relates to the device of a kind of high voltage direct current-direct current energy conversion, transmission, particularly a kind of high voltage direct current-direct current power electronic transformer.
Background technology
HVDC (high voltage direct current) technology is normally used for transmitting high-power electric energy from remote power plant to power consumption equipment, and transmission line can be overhead transmission line or submarine cable.When traditional interchange networking blueprint was infeasible, the HVDC technology also can be used to connect two independently electrical networks.General HVDC transmission system has the efficient of lower cost and Geng Gao than AC transmission system.In the middle of AC transmission system, can give load by power transformer with backbone network electric power tap along the line at power transmission line.But for the HVDC transmission system, because power transformer can't transmit direct current energy, when needs generally need be set up current conversion station during to electric along the line.The common capacity of current conversion station is very big, is not suitable for the electrical load tap.The present invention is intended to realize the conversion of high voltage direct current to low-voltage direct by the Technics of Power Electronic Conversion device.
U.S. Pat 5187651 ( ) related to a kind of a kind of device that electric power is switched to local network from the HVDC electrical power transmission system.In this device, first converter and HVDC transmission line are connected in series; First converter and second converter and first transformer constitute AC network; Second converter and the 3rd converter arrive local AC network by second transformer with power delivery.This device has adopted two transformers, and this is very disadvantageous for reducing volume and weight.In addition,, when practical application, need transform existing HVDC transmission system because first converter of this device and the transmission line of HVDC are connected in series, so very flexible.
U.S. Pat 5311418 has related to a kind of DC/DC power transformer of directly direct voltage of different electric pressures being changed.This DC/DC power transformer is made of valve bridge and three-phase transformer that two electronic power switch devices constitute.Because the valve bridge in this invention has adopted the structure of two level, so is being used for high voltage, especially this structure can't directly be used during the occasion of HVDC transmission system.
Chinese patent 200780049442.3 has related to a kind of electric power with the HVDC transmission system and has been switched to device in the local network.This device is by tap equipment main circuit, and passive device and transformer constitute.Wherein, described tap equipment main circuit is made of voltage source converter, and tap equipment main circuit is in parallel with the HVDC transmission line to obtain electric power.When voltage source converter adopts the structure that is connected in series in the described tap equipment main circuit, can bear the high voltage of HVDC transmission system.In this device, every output one cross streams power supply just needs a transformer to be connected with corresponding voltage source converter; When needs are exported heterogeneous power frequency supply, just need a plurality of Industrial Frequency Transformers.The employing of a plurality of Industrial Frequency Transformers will increase the volume and weight of device, also can cause energy conversion efficiency to descend simultaneously.In addition, the diode of having connected between the voltage source converter of series connection mutually in the Chinese patent 200780049442.3 causes this device can't realize the two-way flow of electric energy.
Summary of the invention:
The objective of the invention is to overcome the shortcoming of existing HVDC transmission system DC-to-DC current converter, reduce the volume and weight of device, propose a kind of high voltage direct current-direct current power electronic transformer.The present invention not only can realize the mutual conversion of different electric pressure direct voltages, can also realize the function of electrical isolation.
The present invention is applicable to the dc-dc power electronic transformer of high-voltage direct current by tandem type modularization current transformer, double winding intermediate frequency or high frequency transformer and constitute based on three parts of the H bridge of full-control type power electronic switching device.
Described tandem type modularization current transformer is made up of two identical brachium pontis, the upper end of each brachium pontis links to each other with the positive pole of input direct voltage, the lower end of each brachium pontis links to each other with the negative pole of input direct voltage, and the mid point of two brachium pontis links to each other respectively with two lead-in wires on double winding intermediate frequency or the former limit of high frequency transformer.In described two brachium pontis, each brachium pontis is divided into first brachium pontis and second brachium pontis according to the mid point of brachium pontis, and first brachium pontis is formed by the identical submodule Sub head and the tail cascade of quantity with second brachium pontis.Submodule Sub is made of a full-control type brachium pontis and electric capacity parallel connection; The full-control type brachium pontis is made of two all-controlling power electronics device series connection.
Described tandem type modularization current transformer is transformed to the square-wave voltage of intermediate frequency or high frequency with high voltage direct current and flows to the former limit of double winding intermediate frequency or high frequency transformer.H bridge based on the full-control type power electronic switching device passes through its switch motion of control, also produces the square-wave voltage of intermediate frequency or high frequency at the secondary of double winding intermediate frequency or high frequency transformer.
Described double winding intermediate frequency or high frequency transformer and a kind of connected mode based on the H bridge of full-control type power electronic switching device are that the secondary of double winding intermediate frequency or high frequency transformer directly is connected with the H bridge, and this moment, the phase angle difference by control double winding intermediate frequency or the former secondary square-wave voltage of high frequency transformer can realize the control to power flow; Another connected mode is to seal in resonant capacitance between the H bridge of the secondary of double winding intermediate frequency or high frequency transformer and full-control type power electronic switching device formation, can realize the series resonance of the former secondary circuit of transformer by the resonant capacitance formation of transformer leakage inductance and series connection.With respect to the situation of no series resonance, can realize the zero current resonant type soft-switch of intermediate frequency or the former secondary circuit of high frequency transformer after the employing series resonance, can reduce the loss of device greatly, improve operational efficiency.
Three-phase power electronics transformer for power distribution of the present invention has following characteristics:
1. can realize being similar to the direct voltage grade conversion of AC transformer, power transfer and electrical isolation;
2. input is a tandem type modularization current transformer, can directly in parallelly insert high-voltage dc voltage, need not to change existing HVDC transmission system configuration.Tandem type modularization current transformer needs the low volage current transformer quantity of cascade to select flexibly according to the input voltage grade;
3. only need a double winding intermediate frequency or high frequency transformer,, can reduce the volume and weight of transformer greatly, improve energy conversion efficiency with respect to conventional device.
4. can realize the zero current resonant type soft-switch of all electronic power switch devices, can greatly reduce system loss, improve operational efficiency; Also can be by improving the volume and weight that switching frequency further reduces transformer.
Description of drawings
Fig. 1 is overall structure figure of the present invention;
Fig. 2 is the physical circuit topology of single submodule Sub in the tandem type modularization current transformer of the present invention;
Among the figure: 1 formula modularization current transformer, 2 double winding intermediate frequency or high frequency transformers, 3 full-control type H bridges, the submodule Sub of 4 tandem type modularization current transformers 1,5 resonant capacitances.
Embodiment
High voltage direct current of the present invention-direct current power electronic transformer overall structure as shown in Figure 1, by tandem type modularization current transformer 1, double winding intermediate frequency or high frequency transformer 2 and constitute based on the full-control type H bridge 3 of full-control type power electronic switching device.
Tandem type modularization current transformer 1 is made of identical two brachium pontis, and the upper end of two brachium pontis all links together with the anodal P of input direct voltage, and the lower end all links together with the negative pole N of input direct voltage.As shown in Figure 1, in these two brachium pontis, each brachium pontis is pressed mid point r 1Or r 2Be divided into first brachium pontis and second brachium pontis, two half-bridge brachium pontis are made of the identical end to end cascade of submodule Sub of quantity up and down.As shown in Figure 2, the full-control type brachium pontis of submodule Sub is by the 11 switch T 11, twelvemo closes T 12, the 11 diode D 11, the 12 diode D 12Constitute, wherein, T 11With D 11Inverse parallel, T12 and D 12Inverse parallel, T 11And T 12Series connection, T 11Lower end and T 12The common tie point in upper end be designated as b 1, T 11The upper end link to each other T with the positive pole of capacitor C 1 12Lower end and capacitor C 1Negative pole link to each other capacitor C 1Negative pole be designated as b 2, b 1And b 2Lead-out wire for submodule Sub.First brachium pontis and second brachium pontis constitute by submodule Sub cascade, that is: the lead-out wire b of a last submodule Sub 2B with next submodule Sub 1Link to each other.
The mid point r of two brachium pontis in the tandem type modularization current transformer 1 1And r 2Link to each other with two lead-in wires on double winding intermediate frequency or high frequency transformer 2 former limits respectively.The mid point h of two lead-in wires of double winding intermediate frequency or high frequency transformer 2 secondary and two brachium pontis of full-control type H bridge 3 1And h 2Link to each other respectively.
Full-control type H bridge is by the first switch T 1, second switch T 2, the 3rd switch T 3, the 4th switch T 4, the first diode D 1, the second diode D 2, the 3rd diode D 3, the 4th diode D 4, and second capacitor C 2Constitute.Wherein, T 1With D 1Inverse parallel, T 2With D 2Inverse parallel, T 3With D 3Inverse parallel, T 4With D 4Inverse parallel, T 1With T 2Series connection constitutes first brachium pontis, T 3With T 4Series connection constitutes second brachium pontis; T 1Lower end and T 2The common tie point in upper end be designated as h 1, T 3Lower end and T 4The common tie point in upper end be designated as h 2, T 1And T 3Upper end and capacitor C 2Positive pole link to each other T 2And T 4Lower end and capacitor C 2Negative pole link to each other.Capacitor C 2Positive pole and negative pole as the positive pole and the negative pole of direct current output.
Described switch is full-control type power electronic switching devices such as IGBT, IGCT or GTO.
On off state by power electronic device in control double winding intermediate frequency or high frequency transformer 2 former limits and the secondary circuit, make the former secondary of double winding intermediate frequency or high frequency transformer 2 all produce the same frequency square-wave voltage of several kHz, can realize dc-dc conversion to tens kHz.As previously mentioned, when adopting series resonance, the square-wave voltage frequency and the phase place of double winding intermediate frequency or high frequency transformer 2 former secondary are identical, and duty ratio is 50%.When not adopting series resonance, can realize the closed-loop control of output dc voltage by the phase angle difference of control double winding intermediate frequency or high frequency transformer 2 former secondary square-wave voltages.
The low-voltage dc voltage that obtains through full-control type H bridge 3 conversion based on the full-control type power electronic switching device can directly be the DC load power supply.Needing the occasion of alternating voltage, it is electric that the low-voltage dc voltage that the full-control type H bridge 3 based on the full-control type power electronic switching device can be provided obtains required alternating voltage through common low pressure inverter conversion.

Claims (4)

1. high voltage direct current-direct current power electronic transformer, it is characterized in that: described dc-dc power electronic transformer is by tandem type modularization current transformer (1), double winding intermediate frequency or high frequency transformer (2) and constitute based on the full-control type H bridge (3) of full-control type power electronic switching device, described tandem type modularization current transformer (1) is made up of two identical brachium pontis, the upper end of each brachium pontis links to each other with the anodal P of input direct voltage, and the lower end of each brachium pontis links to each other with the negative pole N of input direct voltage; Each brachium pontis is divided into first brachium pontis and second brachium pontis, and first brachium pontis is formed by the identical submodule Sub head and the tail cascade of quantity with second brachium pontis; The mid point of described two brachium pontis links to each other respectively with two lead-in wires on double winding intermediate frequency or the former limit of high frequency transformer (2); Described double winding intermediate frequency or high frequency transformer (2) secondary directly be connected with full-control type H bridge (3) or between double winding intermediate frequency or high frequency transformer (2) secondary and full-control type H bridge (3) serial resonant electric capacity (5), constitute the main circuit of realizing series resonance by transformer leakage inductance and resonant capacitance (5).
2. high voltage direct current as claimed in claim 1-direct current power electronic transformer is characterized in that submodule Sub (4) in the described tandem type modularization current transformer (1) is by a full-control type brachium pontis and the first electric capacity electric capacity (C 1) compose in parallel, the full-control type brachium pontis is by the 11 switch (T 11), twelvemo closes (T 12), the 11 diode (D 11) and the 12 diode (D 12) constitute the 11 switch (T 11) and the 11 diode (D 11) inverse parallel, twelvemo is closed (T 12) and the 12 diode (D 12) inverse parallel, the 11 switch (T 11) and twelvemo pass (T 12) series connection, the 11 switch (T 11) the upper end and the first electric capacity (C 1) positive pole link to each other, twelvemo is closed (T 12) lower end and electric capacity (C 1) negative pole b 2Link to each other.
3. high voltage direct current-direct current power electronic transformer according to claim 1 is characterized in that in the described full-control type H bridge (3) the first switch (T 1) and the first diode (D 1) inverse parallel, second switch (T 2) and the second diode (D 2) inverse parallel, the 3rd switch (T 3) and the 3rd diode (D 3) inverse parallel, the 4th switch (T 4) and the 4th diode (D 4) inverse parallel, the first switch (T 1) and second switch (T 2) series connection formation first brachium pontis, the 3rd switch (T 3) and the 4th switch (T 4) series connection formation second brachium pontis; First switch (the T 1) and the 3rd switch (T 3) the upper end and the second electric capacity (C 2) positive pole link to each other second switch (T 2) and the 4th switch (T 4) the lower end and the second electric capacity (C 2) negative pole link to each other the second electric capacity (C 2) positive pole and negative pole as the positive pole and the negative pole of direct current output.
4. as claim 2 or 3 described high voltage direct current-direct current power electronic transformers, it is characterized in that described switch is full-control type power electronic switching device IGBT, IGCT or GTO.
CN201010117551A 2010-03-03 2010-03-03 High-voltage direct-current direct-current (HVDC-DC) power electronic converter transformer Pending CN101795072A (en)

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CN201010117551A CN101795072A (en) 2010-03-03 2010-03-03 High-voltage direct-current direct-current (HVDC-DC) power electronic converter transformer

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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102055348A (en) * 2010-12-24 2011-05-11 东南大学 Voltage reducing power electronic transformer for distribution network
CN102545554A (en) * 2012-01-05 2012-07-04 中国电力科学研究院 Series circuit based on inverse parallel of insulated gate bi-polar transistor (IGBT) and silicon carbide (SiC) avalanche diode
CN102723873A (en) * 2012-06-01 2012-10-10 燕山大学 Dual-input full-isolation integrated current transformer
WO2013071975A1 (en) * 2011-11-17 2013-05-23 Alstom Technology Ltd Hybrid ac/dc converter for hvdc applications
CN103427653A (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
CN103427652A (en) * 2013-08-01 2013-12-04 南京南瑞继保电气有限公司 High-voltage high-power DC-DC conversion device
CN103457468A (en) * 2013-08-01 2013-12-18 南京南瑞继保电气有限公司 High voltage direct current-direct current transformer
CN103633845A (en) * 2013-12-19 2014-03-12 国家电网公司 DC-DC (Direct-Current-Direct-Current) converter
CN103891121A (en) * 2011-08-01 2014-06-25 阿尔斯通技术有限公司 A dc to dc converter assembly
CN104036921A (en) * 2014-06-05 2014-09-10 中国科学院电工研究所 Magnetically-coupled resonant high-frequency air-core transformer
CN104685775A (en) * 2012-10-11 2015-06-03 西门子公司 Modular multilevel DC/DC converter for HVDC applications
US9065299B2 (en) 2010-06-18 2015-06-23 Alstom Technology Ltd Converter for HVDC transmission and reactive power compensation
US9130458B2 (en) 2010-03-15 2015-09-08 Alstom Technology Ltd. Static VAR compensator with multilevel converter
US9209693B2 (en) 2011-11-07 2015-12-08 Alstom Technology Ltd Control circuit for DC network to maintain zero net change in energy level
CN105375757A (en) * 2014-08-25 2016-03-02 国家电网公司 DC voltage conversion device and bridge arm control method thereof
CN105471267A (en) * 2015-12-10 2016-04-06 西华大学 High-voltage high-power DC-DC converter adopting modular structure
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US9954358B2 (en) 2012-03-01 2018-04-24 General Electric Technology Gmbh Control circuit
CN110504840A (en) * 2019-08-08 2019-11-26 华中科技大学 A kind of DC-DC converter suitable for medium voltage distribution network
US10924030B2 (en) 2016-12-16 2021-02-16 Delta Electronics (Shanghai) Co., Ltd Modular power supply system

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Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9350269B2 (en) 2009-07-31 2016-05-24 Alstom Technology Ltd. Configurable hybrid converter circuit
US9130458B2 (en) 2010-03-15 2015-09-08 Alstom Technology Ltd. Static VAR compensator with multilevel converter
US9065299B2 (en) 2010-06-18 2015-06-23 Alstom Technology Ltd Converter for HVDC transmission and reactive power compensation
US9490693B2 (en) 2010-06-18 2016-11-08 Alstom Technology Ltd. Converter for HVDC transmission and reactive power compensation
CN102055348A (en) * 2010-12-24 2011-05-11 东南大学 Voltage reducing power electronic transformer for distribution network
US9350250B2 (en) 2011-06-08 2016-05-24 Alstom Technology Ltd. High voltage DC/DC converter with cascaded resonant tanks
CN103891121B (en) * 2011-08-01 2016-11-23 阿尔斯通技术有限公司 DC-to-DC converter assembly
US9479061B2 (en) 2011-08-01 2016-10-25 Alstom Technology Ltd. DC to DC converter assembly
US9509218B2 (en) 2011-08-01 2016-11-29 Alstom Technology Ltd. DC to DC converter assembly
CN103891121A (en) * 2011-08-01 2014-06-25 阿尔斯通技术有限公司 A dc to dc converter assembly
US9209693B2 (en) 2011-11-07 2015-12-08 Alstom Technology Ltd Control circuit for DC network to maintain zero net change in energy level
CN103959634A (en) * 2011-11-17 2014-07-30 阿尔斯通技术有限公司 Hybrid AC/DC converter for HVDC applications
CN103959634B (en) * 2011-11-17 2017-09-01 通用电气技术有限公司 The mixing AC/DC converters applied for HVDC
WO2013071975A1 (en) * 2011-11-17 2013-05-23 Alstom Technology Ltd Hybrid ac/dc converter for hvdc applications
US9362848B2 (en) 2011-11-17 2016-06-07 Alstom Technology Ltd. Hybrid AC/DC converter for HVDC applications
CN102545554A (en) * 2012-01-05 2012-07-04 中国电力科学研究院 Series circuit based on inverse parallel of insulated gate bi-polar transistor (IGBT) and silicon carbide (SiC) avalanche diode
US9954358B2 (en) 2012-03-01 2018-04-24 General Electric Technology Gmbh Control circuit
CN102723873A (en) * 2012-06-01 2012-10-10 燕山大学 Dual-input full-isolation integrated current transformer
CN102723873B (en) * 2012-06-01 2015-01-07 燕山大学 Dual-input full-isolation integrated current transformer
CN104685775A (en) * 2012-10-11 2015-06-03 西门子公司 Modular multilevel DC/DC converter for HVDC applications
US9748848B2 (en) 2012-10-11 2017-08-29 Siemens Aktiengesellschaft Modular multilevel DC/DC converter for HVDC applications
CN103457468A (en) * 2013-08-01 2013-12-18 南京南瑞继保电气有限公司 High voltage direct current-direct current transformer
CN103427652A (en) * 2013-08-01 2013-12-04 南京南瑞继保电气有限公司 High-voltage high-power DC-DC conversion device
CN103427653A (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
CN103633845A (en) * 2013-12-19 2014-03-12 国家电网公司 DC-DC (Direct-Current-Direct-Current) converter
CN104036921A (en) * 2014-06-05 2014-09-10 中国科学院电工研究所 Magnetically-coupled resonant high-frequency air-core transformer
CN105375757A (en) * 2014-08-25 2016-03-02 国家电网公司 DC voltage conversion device and bridge arm control method thereof
CN105375757B (en) * 2014-08-25 2018-07-17 国家电网公司 A kind of DC voltage conversion device and its bridge arm control method
CN105471267A (en) * 2015-12-10 2016-04-06 西华大学 High-voltage high-power DC-DC converter adopting modular structure
US10924030B2 (en) 2016-12-16 2021-02-16 Delta Electronics (Shanghai) Co., Ltd Modular power supply system
CN110504840A (en) * 2019-08-08 2019-11-26 华中科技大学 A kind of DC-DC converter suitable for medium voltage distribution network

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