CN106301037B - A kind of high voltage ac/dc electrical energy changer and its control method - Google Patents
A kind of high voltage ac/dc electrical energy changer and its control method Download PDFInfo
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Abstract
The present invention relates to a kind of high voltage ac/dc electrical energy changers, it is made of three-phase structure, phase structure is made of the connection of upper and lower two bridge arm converter units, bridge arm converter unit is by two groups of device cascade structures and sub-module cascade structure composition, technical solution provided by the invention carries out switching operation to cascade submodule by devices in series structure, realize the transformation of electrical energy of alternating current-direct current, the topology that part proposes can also be achieved the self-cleaning of DC Line Fault by using full-bridge sub-modular structure, meet the application demand of overhead line.
Description
Technical field
The present invention relates to a kind of ac-dc conversion device, in particular to a kind of high voltage ac/dc electrical energy changer and its
Control method.
Background technique
There are many research achievements, on the basis of original two Level Technology, mould for high pressure DC-AC converter
Block multilevel converter is the current most popular inverter technology suitable for high pressure flexible direct current technology of transmission of electricity, in many documents
In extensive research has been obtained, and realize the engineer application of up to ± 320kV/1000MW.
Existing flexible direct current technology mainly uses cable to carry out power transmission.In order to further by flexible direct current Technique Popularizing
To overhead line system, it is necessary to half-bridge sub-modular structure (Fig. 1 (a)) therein is substituted for full-bridge sub-modular structure (Fig. 1 (b)),
However, this mode causes system loss and investment substantial increase, 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 " proposes a kind of novel converter structure, half used by capable of significantly reducing
Conductor device and capacitor, but control mode is complicated, has many technical problems to be difficult to solve；
For overhead line system the application demand, " AMultilevel of patent WO2014/111164A1
Converterwith Hybrid Full Bridge Cells ", which is proposed, is changed to the structure that half-bridge and full-bridge mix for bridge arm,
Reduce system loss and investment；" the Converter for High voltage of patent WO2011/098117A1
DC Transmission " proposes one kind and switches bridge arm type inverter, by the knot for combining two level and modular multilevel
Structure realizes transformation of electrical energy, but needs complicated and accurate energy balance control, and reality is realized more difficult.
Summary of the invention
To solve above-mentioned deficiency of the prior art, the object of the present invention is to provide a kind of high voltage ac/dc transformation of electrical energy dresses
It sets and its control method, the high voltage ac/dc electrical energy changer carries out switching behaviour to cascade submodule by devices in series structure
Make, realize the transformation of electrical energy of alternating current-direct current, the topology that part proposes can also be achieved direct current event by using full-bridge sub-modular structure
The self-cleaning of barrier meets the application demand of overhead line.
The purpose of the present invention is adopt the following technical solutions realization:
The present invention provides a kind of high voltage ac/dc electrical energy changer, it is improved in that the alterating and direct current can become
Changing device is made of three-phase structure, and every phase is phase structure, and the phase structure is connected by upper and lower two bridge arm converter units
Connect composition.
Wherein, the bridge arm converter unit is by two groups of device cascade structures and sub-module cascade structure composition, including three kinds
Building form:
1) two groups of device cascade structures and sub-module cascade structure are in star-like connection, two groups of device cascade structures
Series connection；Wherein one end of one group of device cascade structure is connected to ac terminal, and one end of another group of device cascade structure is as upper
It is connected to dc positive terminal when bridge arm converter unit structure, is connected to direct current negative pole end when as lower bridge arm converter unit structure
Son；One end of the sub-module cascade structure is connected to the common point between two groups of device cascade structures, and the other end, which is connected to, to be connect
Place；
2) two groups of device cascade structures and sub-module cascade structure are in star-like connection, wherein one group of device cascade structure
One end be connected to ac terminal, the other end is connect with one end of sub-module cascade structure；The one of another group of device cascade structure
End is connected to grounding point, and the other end is connect with one end of sub-module cascade structure；The other end of the sub-module cascade structure connects
It is connected to dc positive terminal or dc negative terminal；
3) two groups of device cascade structures and sub-module cascade structure are in star-like connection, wherein one group of device cascade structure
One end be connected to dc positive terminal or dc negative terminal, the other end is connect with one end of sub-module cascade structure；It is described
The other end of sub-module cascade structure is connected to ac terminal；One end of another group of device cascade structure is connected to grounding point, separately
One end is connected to the common point between device cascade structure and sub-module cascade structure.
Wherein, the device cascade structure is composed in series by power electronic devices, and the power electronic devices is by full-control type
Device and its anti-paralleled diode composition, the wholly-controled device includes insulated gate bipolar transistor IGBT, gate electrode capable of switching off
Thyristor GTO, integrated gate commutated thyristor IGCT and electron injection enhancement gate transistor IEGT.
Wherein, the sub-module cascade structure half-bridge submodule or full-bridge sub-module cascade composition, the sub-module cascade
Reactor is in series on the bridge arm of structure.
Wherein, when the sub-module cascade structure is made of full-bridge sub-module cascade, can be realized DC Line Fault from clear
It removes, meets the application demand of overhead line.
The present invention also provides a kind of control methods of high voltage ac/dc electrical energy changer, it is improved in that described
Method includes following implementations:
1. for mode 1) bridge arm converter unit as upper bridge arm converter unit when, when alternating voltage output be positive half-wave
When, wherein one group of device cascade structure S1p conducting, another group of device cascade structure S2p shutdown, sub-module cascade structure output are handed over
Galvanic electricity positive pressure half-wave Uc, is used to support alternating voltage；When alternating voltage output is negative half-wave, another group of device cascade structure
S2p conducting, wherein one group of device cascade structure S1p shutdown, sub-module cascade structure output DC voltage Vd/2 are used to support just
Pole DC voltage.
For mode 1) bridge arm converter unit as lower bridge arm converter unit when, when alternating voltage output be positive half-wave
When, wherein one group of device cascade structure S1n conducting, another group of device cascade structure S2n shutdown, sub-module cascade structure SMn are defeated
DC voltage Vd/2 out is used to support negative DC voltage；When alternating voltage output is negative half-wave, wherein one group of device cascade
Structure S1n shutdown, another group of device cascade structure S2n conducting, sub-module cascade structure SMn output AC voltage absolute value | Uc
|, it is used to support alternating voltage；
2. for mode 2) bridge arm converter unit as upper bridge arm converter unit when, when alternating voltage output be positive half-wave
When, wherein one group of device cascade structure S1p conducting, another group of device cascade structure S2p shutdown, sub-module cascade structure output are straight
The poor Vd/2-Uc for flowing cathode voltage and alternating voltage, is used to support alternating voltage；When alternating voltage output is negative half-wave, separately
One group of device cascade structure S2p conducting, wherein one group of device cascade structure S1p shutdown, sub-module cascade structure output direct current
Vd/2 is pressed, positive DC voltage is used to support；
For mode 2) bridge arm converter unit as lower bridge arm converter unit when, when alternating voltage output be positive half-wave
When, wherein one group of device cascade structure S1n conducting, another group of device cascade structure S2n shutdown, sub-module cascade structure SMn are defeated
DC voltage Vd/2 out is used to support negative DC voltage；When alternating voltage output is negative half-wave, wherein one group of device cascade
Structure S1n shutdown, another group of device cascade structure S2n conducting, sub-module cascade structure SMn output AC voltage and direct current cathode
The poor Vd/2+Uc of voltage, is used to support alternating voltage；
3. for mode 3) bridge arm converter unit as upper bridge arm converter unit when, when alternating voltage output be positive half-wave
When, wherein one group of device cascade structure S1p conducting, another group of device cascade structure S2p shutdown, sub-module cascade structure output are straight
The poor Vd/2-Uc for flowing cathode voltage and alternating voltage, is used to support alternating voltage；When alternating voltage output is negative half-wave, separately
One group of device cascade structure S2p conducting, wherein one group of device cascade structure S1p shutdown, sub-module cascade structure output alternating current
Press absolute value | Uc |, it is used to support alternating voltage；
For mode 3) bridge arm converter unit as lower bridge arm converter unit when, when alternating voltage output be positive half-wave
When, wherein one group of device cascade structure S1n conducting, another group of device cascade structure S2n shutdown, sub-module cascade structure SMn are defeated
Alternating voltage Uc out is used to support alternating voltage；When alternating voltage output is negative half-wave, S1n shutdown, S2n conducting, submodule
The poor Vd/2+Uc of cascade structure SMn output AC voltage and direct current cathode voltage, is used to support alternating voltage.
The excellent effect that technical solution provided by the invention has is:
1, transformation of electrical energy is realized only with devices in series structure and the series connection of a certain number of submodules, small investment, loss is small,
Land occupation is few；
2, the waveform quality for exchanging side and DC side is high, and required filter capacity is few, in this embodiment it is not even necessary to filter；
3, by using full-bridge submodule, part-structure can effectively realize the isolation of DC Line Fault, be suitable for overhead line
System；
3, by opening or turning off the moment in device cascade structure, the quantity of adjusting submodule cascade structure investment can
Effectively to realize the Sofe Switch of device cascade structure.
Detailed description of the invention
Fig. 1 is sub-module cascade structural topology figure provided by the invention, in which: (a) is half-bridge structure topological diagram, (b) is
Full bridge structure topological diagram (c) is sub-module cascade structure chart；
Fig. 2 is bridge arm converter unit structure chart provided by the invention, in which: (a) is upper bridge arm converter unit implementation
One structure chart (b) is upper two structure chart of bridge arm converter unit implementation, (c) is upper three knot of bridge arm converter unit implementation
Composition；(a ') is one structure chart of lower bridge arm converter unit implementation, and (b ') is two structure of lower bridge arm converter unit implementation
Figure, (c ') are three structure chart of lower bridge arm converter unit implementation；
Fig. 3 is the phase structure figure of high voltage ac/dc electrical energy changer provided by the invention；
Fig. 4 is the three-phase structure figure of high voltage ac/dc electrical energy changer provided by the invention.
Specific embodiment
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
The following description and drawings fully show specific embodiments of the present invention, to enable those skilled in the art to
Practice them.In order to which some aspects of the embodiment to disclosure have a basic understanding, simple summary is shown below.It should
Summarized section is not extensive overview, nor to determine key/critical component or describe the protection scope of these embodiments.
Its sole purpose is that some concepts are presented with simple form, in this, as the preamble of following detailed description.Other embodiment party
Case may include structure, logic, it is electrical, process and other change.Embodiment only represents possible variation.It removes
It non-clearly requires, otherwise individual component and function are optional, and the sequence operated can change.Some embodiments
Part and feature can be included in or replace part and the feature of other embodiments.The range packet of embodiment of the present invention
Include the entire scope of claims and all obtainable equivalents of claims.Herein, this of the invention
A little embodiments can individually or generally be indicated that this is just for the sake of convenient, and if the fact with term " invention "
On disclose invention more than one, the range for being not meant to automatically limit the application is any single invention or inventive concept.
Embodiment
The present invention provides a kind of high voltage ac/dc electrical energy changer, is made of three-phase structure, and every phase is single-phase transformation knot
Structure, phase structure are made of upper and lower two bridge arm converter units.
Bridge arm converter unit structure is by device cascade structure and sub-module cascade structure composition, including three kinds of implementations:
1) such as Fig. 2 (a) and (a '), two groups of device cascade structures and sub-module cascade structure are in star-like connection, device cascade
Remaining one end of structure S1p (S2n) is connected to ac terminal, remaining one end connection of another group of device cascade structure S2p (S1n)
To direct-flow positive pole (cathode) terminal；Remaining one end sub-module cascade structure SMp (SMn) is connected to grounding point.
2) such as Fig. 2 (b) and (b '), two groups of device cascade structures and sub-module cascade structure are in star-like connection, device cascade
Remaining one end of structure S1p (S2n) is connected to ac terminal, remaining one end connection of another group of device cascade structure S2p (S1n)
To grounding point；Remaining one end sub-module cascade structure SMp (SMn) is connected to direct-flow positive pole (cathode) terminal.
3) such as Fig. 2 (c) and (c '), two groups of device cascade structures and sub-module cascade structure are in star-like connection, device cascade
Remaining one end of structure S1p (S2n) is connected to direct-flow positive pole (cathode) terminal, another group of device cascade structure S2p (S1n) its
Remaining one end is connected to grounding point；Remaining one end sub-module cascade structure SMp (SMn) is connected to ac terminal.
Device cascade structure is connected in series by multiple power electronic devices, these devices include wholly-controled device (such as IGBT,
GTO etc.) and its anti-paralleled diode.
Sub-module cascade structure half-bridge as shown in multiple attached drawings one or full-bridge submodule are connected in series, sub-module cascade
Reactor is in series on the bridge arm of structure composition.
The present invention also provides a kind of control method of high voltage ac/dc electrical energy changer, the bridge arm converter unit knot
Structure realizes transformation of electrical energy function by certain bridge arm control method, comprising:
1) structure provided for Fig. 2 (a), when alternating voltage output is positive half-wave, S1p conducting, S2p shutdown, submodule
Block cascade structure SMp output AC voltage positive half-wave Uc, is used to support alternating voltage；When alternating voltage output is negative half-wave,
S2p conducting, S1p shutdown, sub-module cascade structure SMp export DC voltage Vd/2, are used to support positive DC voltage.
For the structure that Fig. 2 (a ') is provided, when alternating voltage output is positive half-wave, S1n conducting, S2n shutdown, submodule
Cascade structure SMn exports DC voltage Vd/2, is used to support negative DC voltage；When alternating voltage output is negative half-wave, S1n
Shutdown, S2n conducting, sub-module cascade structure SMn output AC voltage absolute value | Uc |, it is used to support alternating voltage.
2) structure provided for Fig. 2 (b), when alternating voltage output is positive half-wave, S1p conducting, S2p shutdown, submodule
Block cascade structure SMp exports the poor Vd/2-Uc of direct-flow positive pole voltage and alternating voltage, is used to support alternating voltage；Work as alternating current
Pressure output be negative half-wave when, S2p conducting, S1p shutdown, sub-module cascade structure SMp export DC voltage Vd/2, be used to support just
Pole DC voltage.
For the structure that Fig. 2 (b ') is provided, when alternating voltage output is positive half-wave, S1n conducting, S2n shutdown, submodule
Cascade structure SMn exports DC voltage Vd/2, is used to support negative DC voltage；When alternating voltage output is negative half-wave, S1n
Shutdown, S2n conducting, the poor Vd/2+Uc of sub-module cascade structure SMn output AC voltage and direct current cathode voltage are used to support
Alternating voltage.
3) structure provided for Fig. 2 (c), when alternating voltage output is positive half-wave, S1p conducting, S2p shutdown, submodule
Block cascade structure SMp exports the poor Vd/2-Uc of direct-flow positive pole voltage and alternating voltage, is used to support alternating voltage；Work as alternating current
Pressure output be negative half-wave when, S2p conducting, S1p shutdown, sub-module cascade structure SMp output AC voltage absolute value | Uc |, be used for
Support alternating voltage.
For the structure that Fig. 2 (c ') is provided, when alternating voltage output is positive half-wave, S1n conducting, S2n shutdown, submodule
Cascade structure SMn output AC voltage Uc, is used to support alternating voltage；When alternating voltage output is negative half-wave, S1n shutdown,
S2n conducting, the poor Vd/2+Uc of sub-module cascade structure SMn output AC voltage and direct current cathode voltage are used to support alternating current
Pressure.
High voltage ac/dc electrical energy changer provided by the invention suitable for high pressure level, effectively reduces in inverter
To the quantity demand of storage capacitor, reduce system investments and land occupation, the promotion for flexible direct current technical performance provides one kind
New scheme.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Invention is explained in detail referring to above-described embodiment for pipe, and those of ordinary skill in the art still can be to this hair
Bright specific embodiment is modified or replaced equivalently, these without departing from spirit and scope of the invention any modification or
Equivalent replacement, within the scope of the claims of the invention pending application.
Claims (5)
1. a kind of high voltage ac/dc electrical energy changer, which is characterized in that the alternating current-direct current electrical energy changer is by three-phase structure
Composition, every phase is phase structure, and the phase structure is made of the connection of upper and lower two bridge arm converter units；
The bridge arm converter unit includes the following three types composition side by two groups of device cascade structures and sub-module cascade structure composition
Formula:
1) two groups of device cascade structures and sub-module cascade structure are in star-like connection, two groups of devices cascade structure string
Connection；Wherein one end of one group of device cascade structure is connected to ac terminal, and one end of another group of device cascade structure is as upper bridge
It is connected to dc positive terminal when arm converter unit structure, is connected to direct current negative pole end when as lower bridge arm converter unit structure
Son；One end of the sub-module cascade structure is connected to the common point between two groups of device cascade structures, and the other end, which is connected to, to be connect
Place；
2) two groups of device cascade structures and sub-module cascade structure are in star-like connection, wherein the one of one group of device cascade structure
End is connected to ac terminal, and the other end is connect with one end of sub-module cascade structure；One end of another group of device cascade structure connects
It is connected to grounding point, the other end is connect with one end of sub-module cascade structure；The other end of the sub-module cascade structure is connected to
Dc positive terminal or dc negative terminal；
3) two groups of device cascade structures and sub-module cascade structure are in star-like connection, wherein the one of one group of device cascade structure
End is connected to dc positive terminal or dc negative terminal, and the other end is connect with one end of sub-module cascade structure；The submodule
The other end of block cascade structure is connected to ac terminal；One end of another group of device cascade structure is connected to grounding point, the other end
The common point being connected between device cascade structure and sub-module cascade structure；
The device cascade structure is composed in series by power electronic devices, and the power electronic devices is by wholly-controled device and its instead
Parallel diode composition, the wholly-controled device is by insulated gate bipolar transistor IGBT, gate level turn-off thyristor GTO, collection
It is formed at least one of door pole stream-exchanging thyristor IGCT and electron injection enhancement gate transistor IEGT；
The sub-module cascade structure is made of half-bridge submodule or full-bridge sub-module cascade, the bridge of the sub-module cascade structure
Reactor is in series on arm.
2. high voltage ac/dc electrical energy changer as described in claim 1, which is characterized in that when the sub-module cascade structure
It is made of full-bridge sub-module cascade, can be realized the self-cleaning of DC Line Fault, meet the application demand of overhead line.
3. a kind of control method of such as high voltage ac/dc electrical energy changer of any of claims 1-2, feature
It is, the method includes following implementations:
For building form 1) bridge arm converter unit as upper bridge arm converter unit when, when alternating voltage output be positive half-wave
When, wherein one group of device cascade structure S1p conducting, another group of device cascade structure S2p shutdown, sub-module cascade structure output are handed over
Galvanic electricity positive pressure half-wave Uc, is used to support alternating voltage；When alternating voltage output is negative half-wave, another group of device cascade structure
S2p conducting, wherein one group of device cascade structure S1p shutdown, sub-module cascade structure output DC voltage Vd/2 are used to support just
Pole DC voltage；
For building form 1) bridge arm converter unit as lower bridge arm converter unit when, when alternating voltage output be positive half-wave
When, wherein one group of device cascade structure S1n conducting, another group of device cascade structure S2n shutdown, sub-module cascade structure SMn are defeated
DC voltage Vd/2 out is used to support negative DC voltage；When alternating voltage output is negative half-wave, wherein one group of device cascade
Structure S1n shutdown, another group of device cascade structure S2n conducting, sub-module cascade structure SMn output AC voltage absolute value | Uc
|, it is used to support alternating voltage.
4. a kind of control method of high voltage ac/dc electrical energy changer as claimed in claim 3, which is characterized in that for group
At mode 2) bridge arm converter unit as upper bridge arm converter unit when, when alternating voltage output be positive half-wave when, wherein one group
Device cascade structure S1p conducting, another group of device cascade structure S2p shutdown, sub-module cascade structure output direct-flow positive pole voltage
With the poor Vd/2-Uc of alternating voltage, it is used to support alternating voltage；When alternating voltage output is negative half-wave, another group of device level
It is coupled structure S2p conducting, wherein one group of device cascade structure S1p shutdown, sub-module cascade structure output DC voltage Vd/2 are used for
Support positive DC voltage；
For building form 2) bridge arm converter unit as lower bridge arm converter unit when, when alternating voltage output be positive half-wave
When, wherein one group of device cascade structure S1n conducting, another group of device cascade structure S2n shutdown, sub-module cascade structure SMn are defeated
DC voltage Vd/2 out is used to support negative DC voltage；When alternating voltage output is negative half-wave, wherein one group of device cascade
Structure S1n shutdown, another group of device cascade structure S2n conducting, sub-module cascade structure SMn output AC voltage and direct current cathode
The poor Vd/2+Uc of voltage, is used to support alternating voltage.
5. a kind of control method of high voltage ac/dc electrical energy changer as claimed in claim 3, which is characterized in that for group
At mode 3) bridge arm converter unit as upper bridge arm converter unit when, when alternating voltage output be positive half-wave when, wherein one group
Device cascade structure S1p conducting, another group of device cascade structure S2p shutdown, sub-module cascade structure output direct-flow positive pole voltage
With the poor Vd/2-Uc of alternating voltage, it is used to support alternating voltage；When alternating voltage output is negative half-wave, another group of device level
It is coupled structure S2p conducting, wherein one group of device cascade structure S1p shutdown, sub-module cascade structure output alternating voltage absolute value | Uc
|, it is used to support alternating voltage；
For building form 3) bridge arm converter unit as lower bridge arm converter unit when, when alternating voltage output be positive half-wave
When, wherein one group of device cascade structure S1n conducting, another group of device cascade structure S2n shutdown, sub-module cascade structure SMn are defeated
Alternating voltage Uc out is used to support alternating voltage；When alternating voltage output is negative half-wave, S1n shutdown, S2n conducting, submodule
The poor Vd/2+Uc of cascade structure SMn output AC voltage and direct current cathode voltage, is used to support alternating voltage.
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Citations (3)
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10069430B2 (en) * | 2013-11-07 | 2018-09-04 | Regents Of The University Of Minnesota | Modular converter with multilevel submodules |
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2015
- 2015-05-29 CN CN201510289594.7A patent/CN106301037B/en active Active
Patent Citations (3)
| 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 |
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