CN106301037A - A kind of high voltage ac/dc electrical energy changer and control method thereof - Google Patents
A kind of high voltage ac/dc electrical energy changer and control method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of high voltage ac/dc electrical energy changer, it is made up of three-phase structure, phase structure is connected by upper and lower two brachium pontis converter units and forms, brachium pontis converter unit is made up of two groups of device cascade structures and sub module cascade structure, the technical scheme that the present invention provides carries out switching operation by devices in series structure to cascade submodule, achieve the transformation of electrical energy of alternating current-direct current, the topology that part proposes, by using full-bridge sub modular structure also can realize the self-cleaning of DC Line Fault, meets the application demand of aerial line.
Description
Technical field
The present invention relates to a kind of ac-dc conversion device, a kind of high voltage ac/dc electrical energy changer and controlling party thereof
Method.
Background technology
A lot of achievements in research has been had for high pressure DC-AC changer, on the basis of original two Level Technology, modularity
Multilevel converter is the most most popular inverter technology being applicable to high pressure flexible direct current technology of transmission of electricity, in many documents
Obtain studying widely, and achieved the engineer applied of up to ± 320kV/1000MW.
Existing flexible direct current technology mainly uses cable to carry out power transmission.In order to further that flexible direct current Technique Popularizing is the most built on stilts
Wire system, it is necessary to half-bridge sub modular structure (Fig. 1 (a)) therein is replaced to full-bridge sub modular structure (Fig. 1 (b)),
But, this mode causes system loss and investment significantly to rise, it is difficult to meet engineering demand.
For the topological structure of cable system application, " the HYBRID 2-LEVEL AND of patent US 20130128629A1
MULTILEVELHVDC CONVERTER " propose a kind of novel converter structure, it is possible to significantly reduce and used
Semiconductor device and electric capacity, but control mode is complicated, has a lot of technical problems to be difficult to solve；
For aerial line system application demand, " the AMultilevel Converterwith Hybrid of patent WO2014/111164A1
Full Bridge Cells " propose brachium pontis is changed into half-bridge and full-bridge mixing structure, make system loss and investment be reduced；
" the Converter for High voltage DC Transmission " of patent WO2011/098117A1 proposes one and switches bridge
Arm type inverter, by combining the structure of two level and modular multilevel, it is achieved that transformation of electrical energy, but need complicated and
The accurate energy balance controls, actual realization more difficulty.
Summary of the invention
For solving above-mentioned deficiency of the prior art, it is an object of the invention to provide a kind of high voltage ac/dc electrical energy changer and
Control method, this high voltage ac/dc electrical energy changer carries out switching operation by devices in series structure to cascade submodule, it is achieved
The transformation of electrical energy of alternating current-direct current, the topology that part proposes by using full-bridge sub modular structure also can realize the self-cleaning of DC Line Fault,
Meet the application demand of aerial line.
It is an object of the invention to use following technical proposals to realize:
The present invention provides a kind of high voltage ac/dc electrical energy changer, and it thes improvement is that, described alternating current-direct current electrical energy changer
Being made up of three-phase structure, be phase structure mutually, described phase structure is connected by upper and lower two brachium pontis converter units and forms.
Wherein, described brachium pontis converter unit is made up of two groups of device cascade structures and sub module cascade structure, including three kinds of composition sides
Formula:
1) described two groups of device cascade structures and sub module cascade structure are Y-connection, described two groups of device cascade structures series connection；
One end of one of which device cascade structure is connected to ac terminal, and one end of another group device cascade structure converts as upper brachium pontis
It is connected to direct-flow positive pole terminal during cellular construction, during as lower brachium pontis converter unit structure, is connected to direct current negative terminal；Described son
One end of module-cascade structure is connected to the common point between two groups of device cascade structures, and the other end is connected to earth point；
2) described two groups of device cascade structures and sub module cascade structure are Y-connection, one end of one of which device cascade structure
Being connected to ac terminal, the other end is connected with one end of sub module cascade structure；One end of another group device cascade structure is connected to
Earth point, the other end is connected with one end of sub module cascade structure；The other end of described sub module cascade structure is just being connected to direct current
Extreme son or direct current negative terminal；
3) described two groups of device cascade structures and sub module cascade structure are Y-connection, one end of one of which device cascade structure
Being connected to direct-flow positive pole terminal or direct current negative terminal, the other end is connected with one end of sub module cascade structure；Described submodule level
The other end of connection structure is connected to ac terminal；One end of another group device cascade structure is connected to earth point, and the other end is connected to
Common point between device cascade structure and sub module cascade structure.
Wherein, described device cascade structure is composed in series by power electronic devices, described power electronic devices by wholly-controled device and
Its anti-paralleled diode forms, and described wholly-controled device includes insulated gate bipolar transistor IGBT, gate level turn-off thyristor
GTO, integrated gate commutated thyristor IGCT and electron injection enhancement gate transistor IEGT.
Wherein, described sub module cascade structure half-bridge submodule or full-bridge sub module cascade composition, described sub module cascade structure
Reactor it is in series with on brachium pontis.
Wherein, it is made up of full-bridge sub module cascade when described sub module cascade structure, it is possible to realize the self-cleaning of DC Line Fault, full
The application demand of foot aerial line.
The present invention also provides for the control method of a kind of high voltage ac/dc electrical energy changer, and it thes improvement is that, described method bag
Include following implementation:
1. for mode 1) bridge arm converter unit as upper brachium pontis converter unit time, when alternating voltage is output as positive half-wave,
One of which device cascade structure S1p turns on, and another group device cascade structure S2p turns off, and sub module cascade structure output exchanges
Voltage positive half-wave Uc, is used for supporting alternating voltage；When alternating voltage is output as negative half-wave, another organizes device cascade structure S2p
Conducting, one of which device cascade structure S1p turns off, and sub module cascade structure output DC voltage Vd/2 is used for supporting positive pole
DC voltage.
For mode 1) bridge arm converter unit as lower brachium pontis converter unit time, when alternating voltage is output as positive half-wave, its
In one group of device cascade structure S1n conducting, another group device cascade structure S2n turns off, and the output of sub module cascade structure SMn is straight
Stream voltage Vd/2, is used for supporting negative DC voltage；When alternating voltage is output as negative half-wave, one of which device cascade structure
S1n turns off, the device cascade structure S2n conducting of another group, sub module cascade structure SMn output AC voltage absolute value | Uc |,
For supporting alternating voltage；
2. for mode 2) bridge arm converter unit as upper brachium pontis converter unit time, when alternating voltage is output as positive half-wave,
One of which device cascade structure S1p turns on, and another group device cascade structure S2p turns off, sub module cascade structure output direct current
Cathode voltage and the poor Vd/2-Uc of alternating voltage, be used for supporting alternating voltage；When alternating voltage is output as negative half-wave, another
Group device cascade structure S2p conducting, one of which device cascade structure S1p turns off, sub module cascade structure output DC voltage
Vd/2, is used for supporting positive DC voltage；
For mode 2) bridge arm converter unit as lower brachium pontis converter unit time, when alternating voltage is output as positive half-wave, its
In one group of device cascade structure S1n conducting, another group device cascade structure S2n turns off, and the output of sub module cascade structure SMn is straight
Stream voltage Vd/2, is used for supporting negative DC voltage；When alternating voltage is output as negative half-wave, one of which device cascade structure
S1n turns off, the device cascade structure S2n conducting of another group, sub module cascade structure SMn output AC voltage and direct current negative electricity
The poor Vd/2+Uc of pressure, is used for supporting alternating voltage；
3. for mode 3) bridge arm converter unit as upper brachium pontis converter unit time, when alternating voltage is output as positive half-wave,
One of which device cascade structure S1p turns on, and another group device cascade structure S2p turns off, sub module cascade structure output direct current
Cathode voltage and the poor Vd/2-Uc of alternating voltage, be used for supporting alternating voltage；When alternating voltage is output as negative half-wave, another
Group device cascade structure S2p conducting, one of which device cascade structure S1p turns off, sub module cascade structure output alternating voltage
Absolute value | Uc |, is used for supporting alternating voltage；
For mode 3) bridge arm converter unit as lower brachium pontis converter unit time, when alternating voltage is output as positive half-wave, its
In one group of device cascade structure S1n conducting, another group device cascade structure S2n turns off, and the output of sub module cascade structure SMn is handed over
Stream voltage Uc, is used for supporting alternating voltage；When alternating voltage is output as negative half-wave, S1n turns off, and S2n turns on, submodule
Cascade structure SMn output AC voltage and the poor Vd/2+Uc of direct current cathode voltage, be used for supporting alternating voltage.
The excellent effect that the technical scheme that the present invention provides has is:
1, realize transformation of electrical energy, small investment only with devices in series structure and the series connection of a number of submodule, be lost little, take up an area
Few；
2, the waveform quality of AC and DC side is high, and required filter capacity is few, in this embodiment it is not even necessary to wave filter；
3, by using full-bridge submodule, part-structure can effectively realize the isolation of DC Line Fault, it is adaptable to aerial line system；
3, by opening or turn off the moment at device cascade structure, the quantity that sub module cascade structure puts into is adjusted, can be effective
Realize the Sofe Switch of device cascade structure.
Accompanying drawing explanation
Fig. 1 is the sub module cascade structural topology figure that the present invention provides, and wherein: (a) is half-bridge structure topological diagram, (b) is
Full bridge structure topological diagram, (c) is sub module cascade structure chart；
Fig. 2 is the brachium pontis converter unit structure chart that the present invention provides, wherein: (a) is upper brachium pontis converter unit implementation one knot
Composition, (b) is upper brachium pontis converter unit implementation two structure chart, and (c) is upper brachium pontis converter unit implementation three structure
Figure；(a ') it is lower brachium pontis converter unit implementation one structure chart, (b ') it is lower brachium pontis converter unit implementation two structure chart,
(c ') it is lower brachium pontis converter unit implementation three structure chart；
Fig. 3 is the phase structure figure of the high voltage ac/dc electrical energy changer that the present invention provides；
Fig. 4 is the three-phase structure figure of the high voltage ac/dc electrical energy changer that the present invention provides.
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described in further detail.
The following description and drawings illustrate specific embodiments of the present invention fully, to enable those skilled in the art to put into practice it
?.In order to some aspects of the embodiment disclosed are had a basic understanding, shown below is simple summary.This summary portion
Dividing is not extensive overview, is not key/critical component to be determined or the protection domain describing these embodiments.It is unique
Purpose is to present some concepts, in this, as the preamble of following detailed description by simple form.Other embodiments can be wrapped
Include structure, logic, electric, process and other change.Embodiment only represents possible change.Unless clearly
Requirement, otherwise individually assembly and function are optional, and the order operated can change.The part of some embodiments and
Feature can be included in or replace part and the feature of other embodiments.The scope of embodiment of the present invention includes that right is wanted
Ask the gamut of book, and all obtainable equivalent of claims.In this article, these embodiment party of the present invention
Case can be represented by " inventing " individually or generally with term, and this is only used to conveniently, and if in fact disclosed
Invention more than one, is not meant to automatically limit this application in the range of any single invention or inventive concept.
Embodiment
The present invention provides a kind of high voltage ac/dc electrical energy changer, is made up of three-phase structure, is single-phase mapped structure mutually, single
Phase structure is made up of upper and lower two brachium pontis converter units.
Brachium pontis converter unit structure is made up of device cascade structure and sub module cascade structure, including three kinds of implementations:
1) such as Fig. 2 (a) and (a '), two groups of device cascade structures are Y-connection with sub module cascade structure, and device level connects
Remaining one end of structure S1p (S2n) is connected to ac terminal, and remaining one end of another group device cascade structure S2p (S1n) is even
It is connected to direct-flow positive pole (negative pole) terminal；Sub module cascade structure SMp (SMn) remaining one end is connected to earth point.
2) such as Fig. 2 (b) and (b '), two groups of device cascade structures are Y-connection with sub module cascade structure, and device level connects
Remaining one end of structure S1p (S2n) is connected to ac terminal, and remaining one end of another group device cascade structure S2p (S1n) is even
It is connected to earth point；Sub module cascade structure SMp (SMn) remaining one end is connected to direct-flow positive pole (negative pole) terminal.
3) such as Fig. 2 (c) and (c '), two groups of device cascade structures are Y-connection with sub module cascade structure, and device level connects
Remaining one end of structure S1p (S2n) is connected to direct-flow positive pole (negative pole) terminal, another group device cascade structure S2p (S1n)
Remaining one end be connected to earth point；Sub module cascade structure SMp (SMn) remaining one end is connected to ac terminal.
Device cascade structure is in series by multiple power electronic devices, and these devices include that wholly-controled device is (such as IGBT, GTO
Deng) and anti-paralleled diode.
Sub module cascade structure is in series by the half-bridge shown in multiple accompanying drawings one or full-bridge submodule, sub module cascade structure group
It is in series with reactor on the brachium pontis become.
The present invention also provides for the control method of a kind of high voltage ac/dc electrical energy changer, and described brachium pontis converter unit structure is passed through
Certain brachium pontis control method realizes transformation of electrical energy function, including:
1) structure be given for Fig. 2 (a), when alternating voltage is output as positive half-wave, S1p turns on, and S2p turns off, submodule
Block cascade structure SMp output AC voltage positive half-wave Uc, is used for supporting alternating voltage；When alternating voltage is output as negative half-wave,
S2p turns on, and S1p turns off, sub module cascade structure SMp output DC voltage Vd/2, is used for supporting positive DC voltage.
The structure be given for Fig. 2 (a '), when alternating voltage is output as positive half-wave, S1n turns on, and S2n turns off, submodule
Cascade structure SMn exports DC voltage Vd/2, is used for supporting negative DC voltage；When alternating voltage is output as negative half-wave,
S1n turns off, and S2n turns on, and sub module cascade structure SMn output AC voltage absolute value | Uc | is used for supporting alternating voltage.
2) structure be given for Fig. 2 (b), when alternating voltage is output as positive half-wave, S1p turns on, and S2p turns off, submodule
Block cascade structure SMp output direct-flow positive pole voltage and the poor Vd/2-Uc of alternating voltage, be used for supporting alternating voltage；Work as alternating current
When pressure is output as bearing half-wave, S2p turns on, and S1p turns off, and sub module cascade structure SMp output DC voltage Vd/2, for propping up
Support positive DC voltage.
The structure be given for Fig. 2 (b '), when alternating voltage is output as positive half-wave, S1n turns on, and S2n turns off, submodule
Cascade structure SMn exports DC voltage Vd/2, is used for supporting negative DC voltage；When alternating voltage is output as negative half-wave,
S1n turns off, and S2n turns on, sub module cascade structure SMn output AC voltage and the poor Vd/2+Uc of direct current cathode voltage, uses
In supporting alternating voltage.
3) structure be given for Fig. 2 (c), when alternating voltage is output as positive half-wave, S1p turns on, and S2p turns off, submodule
Block cascade structure SMp output direct-flow positive pole voltage and the poor Vd/2-Uc of alternating voltage, be used for supporting alternating voltage；Work as alternating current
When pressure is output as negative half-wave, S2p turns on, and S1p turns off, sub module cascade structure SMp output AC voltage absolute value | Uc |, uses
In supporting alternating voltage.
The structure be given for Fig. 2 (c '), when alternating voltage is output as positive half-wave, S1n turns on, and S2n turns off, submodule
Cascade structure SMn output AC voltage Uc, is used for supporting alternating voltage；When alternating voltage is output as negative half-wave, S1n closes
Disconnected, S2n turns on, sub module cascade structure SMn output AC voltage and the poor Vd/2+Uc of direct current cathode voltage, is used for supporting
Alternating voltage.
The high voltage ac/dc electrical energy changer being applicable to high pressure level that the present invention provides, effectively reduces in inverter energy storage
The quantity demand of electric capacity, decreases system investments and occupation of land, and the lifting for flexible direct current technical performance provides a kind of new scheme.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit, although reference
The present invention has been described in detail by above-described embodiment, and those of ordinary skill in the field still can concrete to the present invention
Embodiment is modified or equivalent, and these are without departing from any amendment of spirit and scope of the invention or equivalent,
Within the claims of the present invention all awaited the reply in application.
Claims (6)
1. a high voltage ac/dc electrical energy changer, it is characterised in that described alternating current-direct current electrical energy changer is by three-phase structure group
Becoming, be phase structure mutually, described phase structure is connected by upper and lower two brachium pontis converter units and forms.
2. high voltage ac/dc electrical energy changer as claimed in claim 1, it is characterised in that described brachium pontis converter unit is by two
Group device cascade structure and sub module cascade structure composition, including three kinds of building forms:
1) described two groups of device cascade structures and sub module cascade structure are Y-connection, described two groups of device cascade structures series connection；
One end of one of which device cascade structure is connected to ac terminal, and one end of another group device cascade structure converts as upper brachium pontis
It is connected to direct-flow positive pole terminal during cellular construction, during as lower brachium pontis converter unit structure, is connected to direct current negative terminal；Described son
One end of module-cascade structure is connected to the common point between two groups of device cascade structures, and the other end is connected to earth point；
2) described two groups of device cascade structures and sub module cascade structure are Y-connection, one end of one of which device cascade structure
Being connected to ac terminal, the other end is connected with one end of sub module cascade structure；One end of another group device cascade structure is connected to
Earth point, the other end is connected with one end of sub module cascade structure；The other end of described sub module cascade structure is just being connected to direct current
Extreme son or direct current negative terminal；
3) described two groups of device cascade structures and sub module cascade structure are Y-connection, one end of one of which device cascade structure
Being connected to direct-flow positive pole terminal or direct current negative terminal, the other end is connected with one end of sub module cascade structure；Described submodule level
The other end of connection structure is connected to ac terminal；One end of another group device cascade structure is connected to earth point, and the other end is connected to
Common point between device cascade structure and sub module cascade structure.
3. high voltage ac/dc electrical energy changer as claimed in claim 2, it is characterised in that described device cascade structure is by electricity
Power electronic device is composed in series, and described power electronic devices is made up of wholly-controled device and anti-paralleled diode thereof, described full-control type
Device includes insulated gate bipolar transistor IGBT, gate level turn-off thyristor GTO, integrated gate commutated thyristor IGCT
And electron injection enhancement gate transistor IEGT.
4. high voltage ac/dc electrical energy changer as claimed in claim 2, it is characterised in that described sub module cascade structure half
Bridge submodule or full-bridge sub module cascade composition, the brachium pontis of described sub module cascade structure is in series with reactor.
5. high voltage ac/dc electrical energy changer as claimed in claim 4, it is characterised in that when described sub module cascade structure
It is made up of full-bridge sub module cascade, it is possible to realize the self-cleaning of DC Line Fault, meets the application demand of aerial line.
6. a control method for the high voltage ac/dc electrical energy changer as according to any one of claim 2-5, its feature exists
Following implementation is included in, described method:
1. for mode 1) bridge arm converter unit as upper brachium pontis converter unit time, when alternating voltage is output as positive half-wave,
One of which device cascade structure S1p turns on, and another group device cascade structure S2p turns off, and sub module cascade structure output exchanges
Voltage positive half-wave Uc, is used for supporting alternating voltage；When alternating voltage is output as negative half-wave, another organizes device cascade structure S2p
Conducting, one of which device cascade structure S1p turns off, and sub module cascade structure output DC voltage Vd/2 is used for supporting positive pole
DC voltage；
For mode 1) bridge arm converter unit as lower brachium pontis converter unit time, when alternating voltage is output as positive half-wave, its
In one group of device cascade structure S1n conducting, another group device cascade structure S2n turns off, and the output of sub module cascade structure SMn is straight
Stream voltage Vd/2, is used for supporting negative DC voltage；When alternating voltage is output as negative half-wave, one of which device cascade structure
S1n turns off, the device cascade structure S2n conducting of another group, sub module cascade structure SMn output AC voltage absolute value | Uc |,
For supporting alternating voltage；
2. for mode 2) bridge arm converter unit as upper brachium pontis converter unit time, when alternating voltage is output as positive half-wave,
One of which device cascade structure S1p turns on, and another group device cascade structure S2p turns off, sub module cascade structure output direct current
Cathode voltage and the poor Vd/2-Uc of alternating voltage, be used for supporting alternating voltage；When alternating voltage is output as negative half-wave, another
Group device cascade structure S2p conducting, one of which device cascade structure S1p turns off, sub module cascade structure output DC voltage
Vd/2, is used for supporting positive DC voltage；
For mode 2) bridge arm converter unit as lower brachium pontis converter unit time, when alternating voltage is output as positive half-wave, its
In one group of device cascade structure S1n conducting, another group device cascade structure S2n turns off, and the output of sub module cascade structure SMn is straight
Stream voltage Vd/2, is used for supporting negative DC voltage；When alternating voltage is output as negative half-wave, one of which device cascade structure
S1n turns off, the device cascade structure S2n conducting of another group, sub module cascade structure SMn output AC voltage and direct current negative electricity
The poor Vd/2+Uc of pressure, is used for supporting alternating voltage；
3. for mode 3) bridge arm converter unit as upper brachium pontis converter unit time, when alternating voltage is output as positive half-wave,
One of which device cascade structure S1p turns on, and another group device cascade structure S2p turns off, sub module cascade structure output direct current
Cathode voltage and the poor Vd/2-Uc of alternating voltage, be used for supporting alternating voltage；When alternating voltage is output as negative half-wave, another
Group device cascade structure S2p conducting, one of which device cascade structure S1p turns off, sub module cascade structure output alternating voltage
Absolute value | Uc |, is used for supporting alternating voltage；
For mode 3) bridge arm converter unit as lower brachium pontis converter unit time, when alternating voltage is output as positive half-wave, its
In one group of device cascade structure S1n conducting, another group device cascade structure S2n turns off, and the output of sub module cascade structure SMn is handed over
Stream voltage Uc, is used for supporting alternating voltage；When alternating voltage is output as negative half-wave, S1n turns off, and S2n turns on, submodule
Cascade structure SMn output AC voltage and the poor Vd/2+Uc of direct current cathode voltage, be used for supporting alternating voltage.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014042390A (en) * | 2012-08-22 | 2014-03-06 | Toshiba Mitsubishi-Electric Industrial System Corp | Self-excited power conversion device |
| CN104201909A (en) * | 2014-09-12 | 2014-12-10 | 东南大学 | Three-phase modularized multi-level converter for VSC-HVDC (voltage source converter-high voltage DC) and carrier phase-shifting modulation method of converter |
| CN104467393A (en) * | 2015-01-04 | 2015-03-25 | 南京南瑞继保电气有限公司 | Device for preventing sub-module capacitor overvoltage |
| US20150124506A1 (en) * | 2013-11-07 | 2015-05-07 | Ashish Sahoo | Modular converter with multilevel submodules |
-
2015
- 2015-05-29 CN CN201510289594.7A patent/CN106301037B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014042390A (en) * | 2012-08-22 | 2014-03-06 | Toshiba Mitsubishi-Electric Industrial System Corp | Self-excited power conversion device |
| US20150124506A1 (en) * | 2013-11-07 | 2015-05-07 | Ashish Sahoo | Modular converter with multilevel submodules |
| CN104201909A (en) * | 2014-09-12 | 2014-12-10 | 东南大学 | Three-phase modularized multi-level converter for VSC-HVDC (voltage source converter-high voltage DC) and carrier phase-shifting modulation method of converter |
| CN104467393A (en) * | 2015-01-04 | 2015-03-25 | 南京南瑞继保电气有限公司 | Device for preventing sub-module capacitor overvoltage |
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