CN207559874U - A kind of three-phase current source inventer - Google Patents
A kind of three-phase current source inventer Download PDFInfo
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- CN207559874U CN207559874U CN201721610059.8U CN201721610059U CN207559874U CN 207559874 U CN207559874 U CN 207559874U CN 201721610059 U CN201721610059 U CN 201721610059U CN 207559874 U CN207559874 U CN 207559874U
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Abstract
The utility model discloses a kind of three-phase current source inventer, including：DC current source, for generating constant DC current；DC current distribution module, for the constant DC current to be transformed to periodically variable square wave current；Inverter module, for the periodically variable square wave current to be converted to more level staircase waveform electric currents；Phase-shifting transformer module, more level staircase waveform electric currents for the inverter module to be exported realize sinewave output after carrying out multiplex superposition.By the way that phase-shifting transformer is used in multiplex current source inverter, and combine DC current distributor circuit, simultaneously using multiplex and Phase Shift Control Study, can easily be accommodated inverter sinewave output electric current, and realize reactive-load compensation and harmonic restraining function, so as to more adapt to the four quadrant running required by load end or dispatching of power netwoks.
Description
Technical field
The utility model is related to electronic circuit field more particularly to a kind of three-phase current source inventers.
Background technology
Inverter is the power electronic equipment that direct current is converted to alternating current, is motor driving, frequency converter, sensing heating
Important component in the grid-connected power generation systems such as device, uninterruptible power supply and wind energy, photovoltaic, fuel cell.
Inverter is according to the difference of DC side energy-storage travelling wave tube, and inverter can be divided into voltage source inverter, and (energy-storage travelling wave tube is
Capacitance) and current source inverter (energy-storage travelling wave tube is inductance).At present generally using voltage source inverter, voltage source in commercial Application
Inverter direct-flow side operating voltage necessarily be greater than ac output voltage or network voltage peak value and keep constant it is constant, but new
In the applications such as energy power generation, energy storage, photovoltaic module, the DirectCurrent Voltage Ratio of energy-storage system of accumulator are relatively low, voltage fluctuation amplitude compared with
Greatly, work will necessarily then make output current or power grid grid-connected current contain a large amount of harmonic wave to system reluctantly, generally require by straight
Voltage-type could be realized after stream-DC converter (Direct Current to direct current, DC/DC) boosting inverter
It generates electricity by way of merging two or more grid systems, but voltage source inverter increases DC/DC converters and can improve system cost, while busbar voltage control mode is held
Easily cause dc bus collapse, so as to reduce system reliability.Therefore, high-performance is developed, the inverter of low cost becomes electric power
One of common-denominator target of electronics industry development.
Utility model content
The utility model embodiment provides a kind of multiplex current source inverter of integrated phase-shifting transformer, by the more arteries and veins of tradition
Phase-shifting transformer in wave rectification circuit is used in multiplex current source inverter, in combination with DC current distributor circuit or
Prime switched current source, by controlling the periodical conducting switched in DC current distributor circuit, by the constant of current source output
DC current is converted to the square wave current with zero section, periodical stepped change and is assigned to three-phase current source inverter bridge leg
In, direct current input is made to be converted to more level staircase waveform electric currents, more level staircase waveforms are subjected to multiplex using phase-shifting transformer
After superposition, sinewave output is obtained, and realize reactive-load compensation and harmonic restraining function in phase-shifting transformer primary side.
In a first aspect, the utility model provides a kind of three-phase current source inventer, including：
DC current source, for generating constant DC current；
DC current distribution module, for the constant DC current to be transformed to periodically variable square wave current；
Inverter module, for the periodically variable square wave current to be converted to more level staircase waveform electric currents；
Phase-shifting transformer module, for realizing after more level staircase waveform electric currents that the inverter module exports are overlapped
Sinewave output.
Optionally, the inverter module include one or more sets series connection three-phase inverter, wherein, it is described one or more sets
Often set three-phase inverter in the three-phase inverter of series connection includes the three-phase inversion bridge arm of one or more groups of parallel connections.
Optionally, the three-phase inversion bridge arm uses 120 degree of conduction modes.
Optionally, the DC current distribution module includes one or more sets DC current distributor circuits, wherein, described one
The output terminal of often set DC current distributor circuit in set or more set DC current distributor circuit respectively with it is described one or more sets
Often set three-phase inverter electrical connection in the three-phase inverter of series connection.
Optionally, the phase-shifting transformer module includes one or more sets phase-shifting transformers, wherein, the phase-shifting transformer
When module includes more set phase-shifting transformers, the primary side same-phase of more set phase-shifting transformers is in parallel.
Optionally, the phase-shifting transformer includes a primary side and multiple secondary, wherein, the primary side becomes with the phase shift
The output terminal electrical connection of depressor, multiple secondary of the phase-shifting transformer are defeated with more set inverters of the inverter module respectively
Outlet is electrically connected.
Optionally, the primary and secondary side connection mode of the phase-shifting transformer is the connection of Y types, Δ connects, indentation connects,
Hexagon connect or extend-triangle connection in any one or more.
Optionally, the current source inverter further includes the first control module and the second control module；First control
Module and second control module can also be same control module；Wherein, if the DC current distributor circuit and institute
It is wholly-controled device to state three-phase inverter and use, then first control module is used to control the DC current distributor circuit
Be turned on and off, second control module is for controlling being turned on and off for the three-phase inverter；If the direct current
It is half control type device that stream distributor circuit and the three-phase inverter, which use, then first control module is described straight for controlling
The conducting of current dividing circuit is flowed, second control module is used to control the conducting of the three-phase inverter.
Optionally, first control module and second control module can be same control module, can also
The control module different for two.
By implementing the utility model embodiment, the phase-shifting transformer in traditional multiple pulse rectification circuit is used in multiple
In galvanic current source inventer, in combination with DC current distributor circuit, by controlling the week switched in DC current distributor circuit
Phase property is connected, and the constant dc circulation of current source output is changed to zero section, periodically variable square wave current point
It is fitted in the inverter bridge leg of three-phase current source, direct current input is made to be converted to more level staircase waveform electric currents, it will using phase-shifting transformer
After more level staircase waveforms carry out multiplex superpositions, sinewave output is obtained in phase-shifting transformer primary side, and realize reactive-load compensation and
Harmonic restraining function makes ac output current harmonic wave lower, can steadily realize active drop volume, Reactive-power control, and more
Adapt to the four quadrant running required by load end or dispatching of power netwoks.Meanwhile without special and machine communication signal and communication cable,
Without using DC bus capacitance, so as to reduce system cost, system stability is improved.
Description of the drawings
It in order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of structure diagram for three-phase current source inventer that the utility model first embodiment provides；
Fig. 2 is a kind of wiring schematic diagram for three-phase current source inventer that the utility model first embodiment provides；
Fig. 3 is the wiring schematic diagram for another three-phase current source inventer that the utility model first embodiment provides；
Fig. 4 is a kind of structure diagram for three-phase current source inventer that the utility model second embodiment provides；
Fig. 5 is a kind of wiring schematic diagram for three-phase current source inventer that the utility model second embodiment provides；
Fig. 6 is the wiring schematic diagram for another three-phase current source inventer that the utility model second embodiment provides.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
It clearly and completely describes, it is clear that the described embodiments are only a part of the embodiments of the utility model rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without creative efforts
All other embodiments obtained shall fall within the protection scope of the present invention.
It should be noted that the term used in the utility model embodiment is only merely for description specific embodiment
Purpose, and it is not intended to be limiting the utility model.In the utility model embodiment and odd number used in the attached claims
" one kind " of form, " described " and "the" are also intended to including most forms, unless context clearly shows that other meanings.Should also
Work as understanding, term "and/or" used herein refers to and comprising one or more associated list items purposes are any or institute
It is possible that combination.
Term " comprising " and " having " in the specification and claims of the utility model and above-mentioned attached drawing and it
Any deformation, it is intended that cover non-exclusive include.Such as it contains the process of series of steps or unit, method, be
The step of system, product or equipment are not limited to list or unit, but optionally further include the step of not listing or list
Member is optionally further included for other intrinsic steps of these processes, method, product or equipment or unit.
It should be noted that the embodiment of the utility model is described below in detail, the example of the embodiment is in the accompanying drawings
It shows, wherein same or similar label represents same or similar element or the member with same or like function from beginning to end
Part.The embodiments described below with reference to the accompanying drawings are exemplary, is only used for explaining the utility model, and cannot be construed to pair
The limitation of the utility model.
Following disclosure provides many different embodiments or example is used for realizing the different structure of the utility model.For
The disclosure of simplified the utility model, is hereinafter described the component of specific examples and setting.Certainly, they are only and show
Example, and purpose does not lie in limitation the utility model.In addition, the utility model can in different examples repeat reference numerals
And/or letter.This repetition is for purposes of simplicity and clarity, itself not indicate discussed various embodiments and/or set
Relationship between putting.
In the description of the present invention, it should be noted that unless otherwise prescribed and limit, term " installation ", " phase
Even ", " connection ", " connecing " should be interpreted broadly, for example, it may be inside mechanical connection or electrical connection or two elements
Connection, can be directly connected, can also be indirectly connected by intermediary, for those of ordinary skill in the art
Speech can understand the concrete meaning of above-mentioned term as the case may be.
It is understood that the half control type device in the utility model embodiment refers to by controlling signal that can control it
The power electronic devices for being connected and it cannot being controlled to turn off, including thyristor and its most of derivation device, such as quick crystalline substance lock
Pipe, reverse conducting triode thyristor, bidirectional thyristor etc., wholly-controled device refer to not only control its conducting by controlling signal, but also can be with
The power electronic devices that it is controlled to turn off, such as igbt, electric power field-effect transistor, gate electrode capable of switching off crystalline substance lock
Pipe etc..It should be understood that above-mentioned example is only used as a kind of citing, it is impossible to be interpreted as specifically limiting.
Referring to Fig. 1, the structure that Fig. 1 is a kind of three-phase current source inventer that the utility model first embodiment provides is shown
It is intended to, as shown in Figure 1, the current source inverter circuit in the utility model embodiment is included with lower module：DC current source 101,
DC current distribution module 102, inverter module 103, transformer module 104, the first control module 105 and the second control module
106。
Wherein, the DC current source 101, for generating constant DC current；
The DC current distribution module 102, for the constant DC current to be transformed to periodically variable side
Wave electric current；
The inverter module 103, for the periodically variable square wave current to be converted to more level staircase waveform electric currents；
The phase-shifting transformer module 104, for more level staircase waveform electric currents that the inverter module exports to be folded
Sinewave output is realized after adding；
First control module 105, for the DC current distribution module 102 to be controlled to work, wherein, if described straight
Galvanic electricity stream distribution module 102 uses wholly-controled device, then first control module 105 is used to that the DC current to be controlled to distribute
Module 102 is turned on and off；If the DC current distribution module 102 uses half control type device, the first control mould
Block 105 is used to that the DC current distribution module 102 to be controlled to be connected；
Second control module 106, for the inverter module 103 to be controlled to work, wherein, if the inverter module
103 use wholly-controled device, then second control module 106 is used to control being turned on and off for the inverter module 103；If
The inverter module 103 uses half control type device, then second control module 106 is used to that the inverter module 103 to be controlled to lead
It is logical.
When the three-phase current source inventer works, the DC current distribution module 102 controls mould described first
Under the control action of block 105, by the constant DC current that the DC current source 101 exports be converted to zero section,
Periodically variable square wave current, the inverter module 103 is under the control of second control module 106, by the period
Property variation square wave current be converted to more level staircase waveform electric currents and be output to the phase-shifting transformer module 104, the phase shift becomes
Depressor module 104 realizes sinewave output to power grid or load after more level staircase waveform electric currents are overlapped.
Optionally, first control module 105 and second control module 106 can be same control module,
Can also be two different control modules, the utility model is not especially limited.
Optionally, the inverter module 103 include one or more sets series connection three-phase inverter, wherein, it is described a set of or
Often set three-phase inverter in the three-phase inverter of more set series connection includes the three-phase inversion bridge arm of one or more groups of parallel connections.
Optionally, the DC current distribution module 102 includes one or more sets DC current distributor circuits, wherein, institute
State in one or more sets DC current distributor circuits often set DC current distributor circuit output terminal respectively with it is described a set of or
Often set three-phase inverter electrical connection in the three-phase inverter of more set series connection.
Optionally, the phase-shifting transformer module 104 includes one or more sets phase-shifting transformers, wherein, the phase shift becomes
When depressor module includes more set phase-shifting transformers, the primary side same-phase of more set phase-shifting transformers is in parallel.
Optionally, the phase-shifting transformer includes a primary side and multiple secondary, wherein, the primary side becomes with the phase shift
The output terminal electrical connection of depressor, multiple secondary of the phase-shifting transformer are defeated with more set inverters of the inverter module respectively
Outlet is electrically connected.
Optionally, the primary and secondary side connection mode of the phase-shifting transformer includes but not limited to the connection of Y types, Δ connects,
Indentation connection, hexagon connection or extend-triangle connection.
By implementing the utility model three-phase current source inventer, by the phase-shifting transformer in traditional multiple pulse rectification circuit
It is used in multiplex current source inverter, in combination with DC current distributor circuit, by controlling DC current distributor circuit
The periodical conducting of middle switch, the constant DC current that current source exports is converted to zero section, cyclically-varying
Square wave current be assigned in the inverter bridge leg of three-phase current source, make direct current input be converted to more level staircase waveform electric currents, using
After more level staircase waveforms are carried out multiplex superposition by phase-shifting transformer, sinewave output is obtained, and real in phase-shifting transformer primary side
Existing reactive-load compensation and harmonic restraining function, make ac output current harmonic wave lower, can steadily realize active drop volume, idle tune
Section, and more adapt to the four quadrant running required by load end or dispatching of power netwoks.Meanwhile without special and machine communication signal with
Communication cable without DC bus capacitance is used, so as to reduce system cost, improves system stability.
Show referring to Fig. 2, Fig. 2 is the wiring of a kind of three-phase current source inventer that the utility model first embodiment provides
It is intended to, as shown in Fig. 2, the current source inverter during the utility model is implemented includes：Direct voltage source 100, DC current distribution
Module 200, inverter module 300, transformer module 400, the first control module 500 and the second control module 600.
Optionally, the current source inverter further includes：Alternating current filter module 700, the alternating current filter mould
Block 700 is used to be output to the transformer module 400 after the alternating current that the inverter module 300 exports is filtered.
With reference to the current source inverter wiring diagram for being integrated with phase-shifting transformer of Fig. 2 to the current source inverter
Modules are specifically introduced.Wherein, if n is the positive integer more than 1.
Specifically, DC current distribution module 200, the DC current distribution module 200 include two as shown in Figure 2
DC current distributor circuit is covered, two sets of DC current distributor circuits are connected to the both ends of the DC current source 100.
Often set DC current distributor circuit in two sets of DC current distributor circuits includes n direct current allocation unit in parallel, such as
Shown in direct current allocation unit 210 in Fig. 2, the direct current allocation unit 210 include two shunting power switching tubes (Sp1 and
Sp2) with a smoothing reactor (Lp1), after described two shunting power paralleled power switches with one smoothing reactor string
Connection, i.e., often set DC current distributor circuit in described two sets DC current distributor circuits including n smoothing reactor (Lp1~
) and 2n shunting power switching tube (Sp1~Sp2n) Lpn.
Specifically, the inverter module 300 includes the three-phase inverter of two sets of series connection, the three-phase inversion of two sets of series connection
Often set three-phase inverter in device includes two groups of three-phase inversion bridge arms in parallel.As shown in Fig. 2, described often cover in three-phase inverter
A set of three-phase inverter include three-phase inversion bridge arm 310 in parallel and three-phase inversion bridge arm 320, wherein, every group of three-phase inversion
Bridge arm includes six power switch pipes, for example, three-phase inversion bridge arm described in Fig. 2 310 includes 11~S16 of power switch tube S,
Wherein, S11 connects with S14, three bridge arms is formed after S13 connects with S16, S15 connects with S12, after three bridge arm parallel connections
Form three-phase inversion bridge arm.The input terminal of every group of three-phase inversion bridge arm in described two groups three-phase inversion bridge arms in parallel with it is described
The output terminal of DC current distributor circuit is connected, and the three-phase alternating current output terminal of every group of three-phase inversion bridge arm passes through the exchange
Current filtering module 700 is connected with the secondary of the phase-shifting transformer module 400.
Specifically, the phase-shifting transformer module 400 includes two sets of phase-shifting transformers, in two sets of phase-shifting transformers
Often set phase-shifting transformer includes a primary side and two secondary, as shown in Fig. 2, one original of wherein a set of transformer 410
Side is the connection of Y types, and described two secondary are respectively that the connection of Y types connect with Δ type, wherein, the vice-side winding that the Y types connect with
The turn ratio of the vice-side winding of the Δ type connection is 1:√ 3, the primary side same-phase of two sets of phase-shifting transformers is in parallel, forms
Three-phase alternating current output is connected to load or power grid.
Specifically, the alternating current filter module 700 includes four sets of alternating current filter units, four sets of alternating currents
Flow filter unit in often set ac filter unit include three ac filter capacitances (Ca11, Cb11, Cc11 in such as Fig. 2) and
Three ac filter inductance (La11, Lb11, Lc11 in such as Fig. 2).Optionally, the ac filter unit can not also include
The ac filter inductance, the effect of the ac filter inductance are realized by the leakage inductance of the transformer.
When the inverter works normally, the DC current that the direct voltage source 100 exports is input to the direct current
Electric current distribution module 200, through in the DC current distribution module 200 smoothing reactor filtering after, the DC current without
Pulsation, can be equivalent to DC current source, first control module 500 controls the work(in the DC current distribution module 200
Rate switching tube it is open-minded, by the constant DC current be converted to two groups have zero section, periodically variable square wave electricity
Flow point is fitted in two sets of three-phase inversion bridge arms in parallel.Two sets of three-phase inversion bridge arms are in second control module 600
Using 120 ° of conduction modes under control, switch operating frequency is power frequency 50Hz or 60Hz, in the three-phase inversion bridge arm 310
S11~S16 this six power switch pipes composition this group of three-phase inversion bridge arm for, the six of every group of three-phase inversion bridge arm
A power switch pipe triggers successively according to the sequence of S16-S11-S12-S13-S14-S15-S16, and a bridge arm is triggered every 60 °
On power switch pipe.The periodically variable square wave current is converted to more level staircase waveforms by two sets of three-phase inverters
Electric current after more level staircase waveform electric currents are filtered by the alternating current filter module 700, is input to the phase shift transformation
The vice-side winding of device 400 is exported two sets of inverters by two sets of phase-shifting transformers of phase-shifting transformer module 400 more
Realize sinewave output to power grid or load after the superposition of level staircase waveform electric current.
Optionally, first control module 500 and second control module 600 can be same control module,
Can also be two different control modules, the utility model is not especially limited.
Optionally, the power switch pipe of the three-phase inversion bridge arm and the DC current distributor circuit can be half control type
Device for power switching, such as thyristor, silicon-controlled, high speed thyristor or full-control type device for power switching, such as insulated gate
Bipolar transistor (Insulated Gate Bipolar Transistor, IGBT), electric power field-effect transistor, gate pole can
Cutoff thyristor (Gate Turn-Off Thyristor, GTO) etc., the utility model embodiment is not especially limited.
Optionally, in current source inverter shown in Fig. 2, the primary side of the phase-shifting transformer is connected for Y types, two pairs
While being respectively that the connection of Y types is connected with Δ type, in practical utilization, the primary side and the secondary can also be that indentation connects
Connect, hexagon connection, extend-triangle connection etc. connection modes, the utility model embodiment be not especially limited.
Optionally, in current source inverter shown in Fig. 2, the often set three-phase inverter includes two groups of three-phases in parallel
Inverter bridge leg, in practical utilization, according to the difference of transformer secondary winding connection method, the often set three-phase inverter can change
It is in parallel for three-phase inversion bridge arm more than two, as shown in figure 3, Fig. 3 is the another kind that the utility model first embodiment provides
The wiring schematic diagram of current source inverter, Fig. 3 are the wiring signal for the three-phase inverter that four groups of three-phase inversion bridge arm parallel connections are formed
Figure, the primary side of phase-shifting transformer described in figure are connected for Y types, and two secondary are respectively that hexagon connection is connected with indentation, can
It is replaced in Fig. 2 by two groups of three-phase inversion bridge arms simultaneously with the three-phase inverter formed with four groups of three-phase inversion bridge arm parallel connections in Fig. 3
Join the three-phase inverter formed, so as to form new current source inverter.It should be understood that the often set three-phase inverter in Fig. 2 can be with
It is made of one or more groups of three-phase inversion bridge arm parallel connections, the utility model embodiment is not especially limited.
As can be seen that the three-phase current source inventer in the utility model embodiment, it will be in traditional multiple pulse rectification circuit
Phase-shifting transformer be used in multiplex current source inverter, in combination with DC current distributor circuit, by controlling direct current
The periodical conducting switched in current dividing circuit, the constant DC current that current source exports is converted to zero area
Between, periodically variable square wave current be assigned in the inverter bridge leg of three-phase current source, make direct current input be converted to more level ladders
Wave electric current after more level staircase waveforms are carried out multiplex superposition using phase-shifting transformer, obtains just in phase-shifting transformer primary side
String wave exports, and realizes reactive-load compensation and harmonic restraining function, makes ac output current harmonic wave lower, can steadily realize
Work(drop volume, Reactive-power control, and more adapt to the four quadrant running required by load end or dispatching of power netwoks.Meanwhile without special
And machine communication signal and communication cable, without DC bus capacitance is used, so as to reduce system cost, improve system
Stability.
Referring to Fig. 4, the structure that Fig. 4 is a kind of three-phase current source inventer that the utility model second embodiment provides is shown
It is intended to.Current source inverter circuit in the utility model embodiment is included with lower module：DC current source 401, DC/DC converters
Module 402, inverter module 403, transformer module 404, the first control module 405 and the second control module 406.
Wherein, the DC current source 401, for generating constant DC current；
The DC/DC converter modules 402, for passing through high-frequency impulse width modulated (Pulse Width
Modulation, PWM) control output stable DC stream；
The inverter module 403, the DC current for the DC/DC converter modules 402 to be exported are converted to mostly electric
Flat staircase waveform electric current；
The phase-shifting transformer module 404, for more level staircase waveform electric currents that the inverter module exports to be folded
Sinewave output is realized after adding；
First control module 405, for the DC/DC converter modules 402 to be controlled to work, wherein, if the DC/
DC converter modules 402 use wholly-controled device, then first control module 405 is used to control the DC current distribution mould
Block 402 is turned on and off；
Second control module 406, for the inverter module 403 to be controlled to work, wherein, if the inverter module
403 use wholly-controled device, then second control module 406 is used to control being turned on and off for the inverter module 403；If
The inverter module 403 uses half control type device, then second control module 406 is used to that the inverter module 403 to be controlled to lead
It is logical.
Optionally, first control module 405 and second control module 406 can also be same control mould
Block or different two control modules.The utility model is not especially limited.
Optionally, the current source inverter further includes：Alternating current filter module 407, the alternating current filter mould
Block 407 is used to be output to the transformer module 404 after the alternating current that the inverter module 403 exports is filtered.
It, also can not be to the active power of system and idle since current source type multiple inverter can not adjust output current
Power is independently controlled, and in order to realize the flexible modulation of output variable, as shown in Figure 2, two sets of phases is used in above-described embodiment
The mode of same three-phase inverter topological structure series connection can increase another control variable, due to two sets of three-phases in this way
Inverter structure is independent from each other, it is possible to be controlled the phase-shifting trigger angle of two sets of three-phase inverters respectively, can be changed in this way
Become the phase difference between the amplitude of primary side winding electric current of phase-shifting transformer and primary side winding electric current, it is defeated so as to fulfill always exchanging
Go out the adjusting that facilitates of sine-wave current, and realize the flexible control to system active power and reactive power, realize system four
The purpose of quadrant operation.Another method can also increase prime switched current source, only need a set of three-phase inverter just in this way
It can realize above-mentioned purpose, and prime switched current source can be realized by the DC/DC converters in Fig. 4.
For example, as shown in figure 5, Fig. 5 is a kind of three-phase current source inversion that the utility model second embodiment provides
The wiring schematic diagram of device.It can be seen that with Fig. 2 comparisons, circuit shown in fig. 5 will be electric by flat wave in DC current distribution module in Fig. 2
The DC current distributor circuit that anti-device and power switch pipe are formed replaces with switched current source i.e. multiphase buckconverters
(Buck converters), in 402 circuit of DC/DC converter modules being made of multiphase Buck converters in Fig. 5, n multiphase
Buck current source DC/DC converters work in high frequency switch-mode by first control module, and master power switch pipe Sb1~
When any one switching tube is connected in Sbn, corresponding inductance Lb1~Lbn energy storage, inductive current linear rise, while to two
Current inverter power supply in parallel；When master power switch pipe disconnects, the energy being stored on inductance is continued by main power diode
Stream continues to power, therefore high-frequency impulse width modulated (the Pulse Width for passing through Buck to two current source inverters in parallel
Modulation, PWM) control can be with flexible modulation output current.Since prime switching current source circuit is converted by multiphase Buck
Device is formed, and output current is continuous always, so as to provide controllable stabling current to rear class three-phase inverter.In addition, this n
A Buck converters may operate in direct paralleling model, can also work in crisscross parallel pattern, work in described interlock
During paralleling model, additionally it is possible to reduce input, output current ripple.Meanwhile switched current source can also be by 1 Buck converter structure
Into, if n Buck converter works in crisscross parallel pattern, each mutual phase shift 360/n work of multi-phase converter,
Square wave current input can also be provided to rear class current source inverter in this way, so as to realize the distribution electricity of the DC current in Fig. 2
Road exports the effect of square wave current.It should be understood that since prime is multiphase Buck converters, this current source inverter is just
Often during work, direct-current input power supplying voltage needs the peak value higher than ac output voltage.
Optionally, the Buck converters can also use boost chopper converter (Boost) to replace, such as Fig. 6 institutes
Show, Fig. 6 is the wiring schematic diagram for another current source inverter that the utility model second embodiment provides.It is shown in fig. 6 by
In the circuit for the DC/DC converter modules 402 that multiphase Boost is formed, n multiphase Boost current sources DC/DC becomes
Parallel operation works in high frequency switch-mode, when master power switch pipe Sb1~Sbn is connected, corresponding inductance Lb1~Lbn energy storage, and inductance
Electric current linear rise, at the same dc-link capacitance Cb energy by filter inductance Lb to two double galvanic current sources in parallel of rear class
Inverter provides energy；When master power switch pipe disconnects, be stored in energy on inductance charge to dc-link capacitance Cb and to
Rear class current source inverter discharges, therefore can be with flexible modulation output current by the high-frequency PWM control of Boost.Due to prime
There are filter inductance Lb between switched current source and rear class current source inverter, therefore intermediate dc bus electric current is continuous always,
So as to provide controllable stabling current to rear class current source inverter.In addition, this n Boost may operate in
Direct paralleling model can also work in crisscross parallel pattern, also be able to reduce input, output working in crisscross parallel pattern
Current ripples.Meanwhile switched current source can also be made of 1 Boost, if n Boost works in friendship
During wrong paralleling model, each mutual phase shift 360/n work of multi-phase converter in this way can also be to rear class current source inverter
Square wave current input is provided, so as to realize the effect of the output square wave current of the DC current distributor circuit in Fig. 2.It should be appreciated that
, since prime is multiphase Boost, when this inverter works normally, direct-current input power supplying voltage can be less than
The peak value of ac output voltage.
By implementing the utility model embodiment, the phase-shifting transformer in traditional multiple pulse rectification circuit is used in multiple
In galvanic current source inventer, in combination with the DC/DC converter modules, by controlling work(in the DC/DC converter circuits
The constant DC current that current source exports is converted to the direct current of stable low current ripple by the periodical conducting of rate switching tube
Electric current is assigned in the inverter bridge leg of three-phase current source, and direct current input is made to be converted to more level staircase waveform outputs, is become using phase shift
After more level staircase waveforms are carried out multiplex superposition by depressor, sinewave output is obtained in phase-shifting transformer primary side, and realize idle
Compensation and harmonic restraining function, make ac output current harmonic wave lower, can steadily realize active drop volume, Reactive-power control, and
And more adapt to the four quadrant running required by load end or dispatching of power netwoks.Meanwhile without special and machine communication signal and communication
Cable without DC bus capacitance is used, so as to reduce system cost, improves system stability.
Optionally, the power switch pipe of the three-phase inversion bridge arm can be half control type device for power switching, as thyristor,
Silicon-controlled, high speed thyristor etc. or full-control type device for power switching, such as insulated gate bipolar transistor (Insulated
Gate Bipolar Transistor, IGBT), electric power field-effect transistor, gate level turn-off thyristor (Gate Turn-Off
Thyristor, GTO) etc., the power switch pipe of the DC/DC converters is generally using full-control type device for power switching, this practicality
New embodiment is not especially limited.
It is that can pass through one of ordinary skill in the art will appreciate that realizing all or part of flow in above-described embodiment
Computer program is completed to instruct relevant hardware, and the program can be stored in a computer read/write memory medium,
The program is when being executed, it may include such as the flow of the various embodiments described above.Wherein, the storage medium can be magnetic disc, CD, only
Read storage memory (Read-Only Memory, ROM) or random access memory (Random Access Memory, RAM)
Deng.
Above disclosed is only a kind of the utility model preferred embodiment, cannot limit this practicality with this certainly
Novel interest field, one of ordinary skill in the art will appreciate that realize all or part of flow of above-described embodiment, and according to
The equivalent variations that the utility model claims are made still fall within the range that utility model is covered.
Claims (8)
1. a kind of three-phase current source inventer, which is characterized in that including：
DC current source, for generating constant DC current；
DC current distribution module, for the constant DC current to be transformed to periodically variable square wave current；
Inverter module, for the periodically variable square wave current to be converted to more level staircase waveform electric currents；
Phase-shifting transformer module, it is sinusoidal for realizing after more level staircase waveform electric currents that the inverter module exports are overlapped
Wave exports.
2. three-phase current source inventer according to claim 1, which is characterized in that the inverter module includes a set of or more
The three-phase inverter of series connection is covered, wherein, the often set three-phase inverter in the three-phase inverter of one or more sets series connection includes
The three-phase inversion bridge arm of one or more groups of parallel connections.
3. current source inverter according to claim 2, which is characterized in that the three-phase inversion bridge arm is led using 120 degree
Logical pattern.
4. three-phase current source inventer according to claim 2, which is characterized in that the DC current distribution module includes
One or more sets DC current distributor circuits, wherein, the often set direct current in one or more sets described DC current distributor circuits
The output terminal of stream distributor circuit is electrically connected respectively with the often set three-phase inverter in the three-phase inverter that one or more sets are connected
It connects.
5. three-phase current source inventer according to claim 2, which is characterized in that the phase-shifting transformer module includes one
Set covers phase-shifting transformer more, wherein, when the phase-shifting transformer module includes more set phase-shifting transformers, more set phase shifts become
The primary side same-phase of depressor is in parallel.
6. three-phase current source inventer according to claim 5, which is characterized in that the phase-shifting transformer includes an original
Side and multiple secondary, wherein, the primary side is electrically connected with the output terminal of the phase-shifting transformer, the phase-shifting transformer it is multiple
Output terminal of the secondary respectively with the three-phase inversion bridge arm of the inverter module is electrically connected.
7. three-phase current source inventer according to claim 6, which is characterized in that the primary side and pair of the phase-shifting transformer
Side connection mode is any one during the connection of Y types, Δ connection, indentation connection, hexagon connection or extend-triangle connect
It is or a variety of.
8. three-phase current source inventer according to claim 1, which is characterized in that the current source inverter further includes
One control module and the second control module；Wherein, if the DC current distributor circuit and the three-phase inverter use and be
Wholly-controled device, then first control module is for controlling being turned on and off for the DC current distributor circuit, and described the
Two control modules are used to control being turned on and off for the three-phase inverter；If the DC current distributor circuit and the three-phase
It is half control type device that inverter, which uses, then first control module is used to control leading for the DC current distributor circuit
Logical, second control module is used to control the conducting of the three-phase inverter；First control module and second control
Molding block can be same control module, or two different control modules.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721610059.8U CN207559874U (en) | 2017-11-24 | 2017-11-24 | A kind of three-phase current source inventer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107979299A (en) * | 2017-11-24 | 2018-05-01 | 胡炎申 | A kind of three-phase current source inventer |
| CN109167528A (en) * | 2018-08-30 | 2019-01-08 | 中国科学院电工研究所 | High voltage direct current transmission device and its control method |
| CN113270997A (en) * | 2021-06-07 | 2021-08-17 | 浙江精英电器有限公司 | Progressive control method and control circuit for surge steps of inverter |
-
2017
- 2017-11-24 CN CN201721610059.8U patent/CN207559874U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107979299A (en) * | 2017-11-24 | 2018-05-01 | 胡炎申 | A kind of three-phase current source inventer |
| CN109167528A (en) * | 2018-08-30 | 2019-01-08 | 中国科学院电工研究所 | High voltage direct current transmission device and its control method |
| CN113270997A (en) * | 2021-06-07 | 2021-08-17 | 浙江精英电器有限公司 | Progressive control method and control circuit for surge steps of inverter |
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