CN108448905A - A kind of multi-tap phase-shifting transformer for cascade multilevel inverter - Google Patents
A kind of multi-tap phase-shifting transformer for cascade multilevel inverter Download PDFInfo
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- CN108448905A CN108448905A CN201810305943.3A CN201810305943A CN108448905A CN 108448905 A CN108448905 A CN 108448905A CN 201810305943 A CN201810305943 A CN 201810305943A CN 108448905 A CN108448905 A CN 108448905A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
- H02M5/12—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion of voltage or current amplitude only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention relates to a kind of multi-tap phase-shifting transformers for cascade multilevel inverter.The phase-shifting transformer is three-phase multi-tap combined transformer, and the primary side winding of the three-phase multi-tap combined transformer is made up of N1 circle coils wye connection per phase；The vice-side winding of the three-phase multi-tap combined transformer is made of per phase two independent windings, the windings in series that the winding that wherein umber of turn is N2 is N3 by triangular form connection and umber of turn；The vice-side winding of the three-phase multi-tap combined transformer is per mutually with 4 power switch for adjusting phase shifting angle；The power switch uses two-way IGBT or two-way IGCT.The present invention by adjusting preset tap position, and then controls phase shifting angle, inverter is allowed to be operated in the balanced mode after degrading when some submodule of inverter breaks down.This tap phase-shifting transformer can effectively eliminate the ac harmonic currents of the primary side winding of transformer caused by factor module failure so that the power quality of outlet side effectively improves.
Description
Technical field
The present invention relates to more level powers to convert field, specifically a kind of for the more of cascade multilevel inverter
Tap phase-shifting transformer.
Background technology
H bridge cascade multilevel inverters are widely used in the industrial circle of mesohigh frequency control, such as：Pipeline compresses
Machine, milling train, wind-power electricity generation and railway electric traction drive system.A large amount of low-voltages etc. not only may be used in H bridge tandem type structures
The device of grade realizes the output of high pressure, and strong with structural module, minimum using device, and reliability is high, input power because
The advantages that number is high, and output is without the use of filter.Cascaded multilevel inverter for mesohigh frequency control application needs more
A isolation and mutually independent DC power supply.Usual inverter is powered by 6 pulse rectifiers of multiple independent DC voltages, is led to
It crosses a Multiple coil or phase-shifting transformer is connected with power grid.This transformer effect not only ensure each section voltage between every
From, and can by eliminate by 6 pulse rectifier of each part power switch generate certain harmonic waves for input side provide compared with
Ideal power quality.
The power semiconductor and its control circuit of inverter are easiest to break down, once failure is generated, it is entire to drive
Dynamic model block will lose the ability of normal work, can be impacted to industrial production.When certain of H bridge cascade multilevel inverters
When a submodule breaks down, because traditional multiwinding transformer has the shortcomings that fixed voltage ratio and fixed phase shifting angle,
Inverter would operate in three-phase imbalance pattern, the ac harmonic currents which can not ignore injection, into
And cause the undesirable conditions such as system job insecurity.
For the multi-tap phase-shifting transformer of cascade multilevel inverter, will be provided for cascade multilevel inverter solid
Constant voltage ratio, but the adjustable DC power supply of phase shifting angle.It is default by adjusting when some submodule of inverter breaks down
Tap position, and then control phase shifting angle, allow inverter be operated in degrade after balanced mode.This tap phase-shifting transformer energy
Effectively eliminate the ac harmonic currents of the primary side winding of transformer caused by factor module failure so that the power quality of outlet side
It effectively improves.
Invention content
The purpose of the present invention is to provide a kind of multi-tap phase-shifting transformer for cascade multilevel inverter, the shiftings
Phase transformer by adjusting preset tap position, and then controls phase shifting angle when some submodule of inverter breaks down,
Inverter is allowed to be operated in the balanced mode after degrading.Caused by this tap phase-shifting transformer can effectively eliminate factor module failure
The ac harmonic currents of the primary side winding of transformer so that the power quality of outlet side effectively improves.
To achieve the above object, the technical scheme is that：A kind of multi-tap for cascade multilevel inverter
Phase-shifting transformer, the phase-shifting transformer are three-phase multi-tap combined transformer, the three-phase multi-tap combined transformer
Primary side winding is made up of N1 circle coils wye connection per phase；The vice-side winding of the three-phase multi-tap combined transformer is every
It is mutually made of two independent windings, the winding that the winding that wherein umber of turn is N2 is N3 by triangular form connection and umber of turn
Series connection；The vice-side winding of the three-phase multi-tap combined transformer is per mutually with 4 power switch for adjusting phase shifting angle.
In an embodiment of the present invention, the power switch uses two-way IGBT or two-way IGCT.
In an embodiment of the present invention, the specific connection type of the vice-side winding of the three-phase multi-tap combined transformer
For：It is the first winding to enable the winding for being N2 per umber of turn in phase, and the winding that umber of turn is N3 is the second winding, then A phases the
One end of one winding passes through the first power switch of A phases and one end of the second power switch of A phases, one end of the second winding of A phases, A phases
One end of 4th power switch, one end connection of the first winding of B phases, intermediate ends and the second power switch of A phases of the first winding of A phases
Other end connection, the other end of the first winding of A phases and one end of the first power switch of C phases, the second power switch of C phases one
One end connection at end, one end of the 4th power switch of C phases, the second winding of C phases, the other end of the second winding of A phases pass through A phase thirds
Power switch is connect with the other end of the 4th power switch of A phases, and the intermediate ends of the first winding of B phases pass through the second power switch of B phases
With one end of the first power switch of B phases, one end of the second winding of B phases, one end of the 4th power switch of B phases, the first winding of C phases
One end connects, and the other end of the first winding of B phases is connect with the other end of the first power switch of B phases, the other end of the second winding of B phases
It is connect with the other end of the 4th power switch of B phases by B phase third power switch, intermediate ends, the C phases first of the first winding of C phases
The other end of winding is connect with the other end of the other end of the second power switch of C phases, the first power switch of C phases respectively, C phases second
The other end of winding is connect by C phase third power switch with the other end of the 4th power switch of C phases.
In an embodiment of the present invention, when being closed with third power switch per the second power switch of phase, phase-shifting transformer moves
Phase angle output is ± 20 °, is disconnected at this time with the 4th power switch per the first power switch of phase；Per the first power switch of phase and the 4th
When power switch is closed, the output of phase-shifting transformer phase shifting angle is ± 30 °, and the second power switch and third power switch are disconnected at this time
It opens.
In an embodiment of the present invention, the switch motion of phase-shifting transformer is provided by erroneous detection signal.
In an embodiment of the present invention, erroneous detection signal is carried by each submodule of H bridge cascade multilevel inverters
For.
Compared to the prior art, the invention has the advantages that：
1, power switch of the present invention is two-way IGBT power switch or two-way IGCT power switch.In inverter
Some submodule when breaking down, power switch is receiving erroneous detection signal, acts in a short period of time, makes phase shift
The phase shifting angle of transformer changes, and improves the stability of system work；
2, power switch of the present invention is connected with preset tap position, and preset tap position corresponds to different
Phase shifting angle.Compensate the ac harmonic currents of the primary side winding of transformer caused by inverter sub-module fault.Improve phase shift
The THD of transformer input sidei, reduce the distortion because of inverter sub-module fault electric current, ensure that inverter is reliably run.
Description of the drawings
Governing system topological structure is pressed in 7 level inverse conversion of Fig. 1 one embodiment of the invention cascades type.
Fig. 2 tradition phase-shifting converter topologies.
Multi-tap phase-shifting transformer topological structure in Fig. 3 one embodiment of the invention.
Multi-tap phase-shifting transformer phase shift angle in Fig. 4 one embodiment of the invention.
In Fig. 5, Fig. 5 (a) does not use the transformer, voltage waveform when inverter sub-module fault；Fig. 5 (b) is not used
The transformer, network side current waveform when inverter sub-module fault；Fig. 5 (c) does not use the transformer, inverter submodule
Net side a phase currents Fourier analysis waveform when failure.
In Fig. 6, the transformer is used in Fig. 6 (a) one embodiment of the invention, voltage and current when inverter sub-module fault
Waveform；The transformer is used in Fig. 6 (b) one embodiment of the invention, network side current waveform when inverter sub-module fault；Fig. 6
(c) transformer is used in one embodiment of the invention, net side a phase current Fourier analysis waves when inverter sub-module fault
Shape.
Specific implementation mode
Below in conjunction with the accompanying drawings, technical scheme of the present invention is specifically described.
A kind of multi-tap phase-shifting transformer for cascade multilevel inverter of the present invention, the phase-shifting transformer are three
The primary side winding of phase multi-tap combined transformer, the three-phase multi-tap combined transformer passes through star per phase by N1 circle coils
Type connection is constituted；The vice-side winding of the three-phase multi-tap combined transformer is made of per phase two independent windings, wherein around
The windings in series that the winding that group the number of turns is N2 is N3 by triangular form connection and umber of turn；The three-phase multi-tap combined variable
The vice-side winding of depressor is per mutually with 4 power switch for adjusting phase shifting angle.
The power switch uses two-way IGBT or two-way IGCT.
The specific connection type of the vice-side winding of the three-phase multi-tap combined transformer is：Umber of turn in enabling per phase
Winding for N2 is the first winding, and the winding that umber of turn is N3 is the second winding, then one end of the first winding of A phases passes through A phases
First power switch and one end of the second power switch of A phases, one end of the second winding of A phases, one end of the 4th power switch of A phases, B
One end of the first winding of phase connects, and the intermediate ends of the first winding of A phases are connect with the other end of the second power switch of A phases, A phases first
The other end of winding and one end of the first power switch of C phases, one end of the second power switch of C phases, the 4th power switch of C phases one
One end connection at end, the second winding of C phases, the other end of the second winding of A phases pass through A phase third power switch and the 4th power of A phases
The other end of switch connects, and the intermediate ends of the first winding of B phases pass through the second power switch of B phases and the one of the first power switch of B phases
One end connection at end, one end of the second winding of B phases, one end of the 4th power switch of B phases, the first winding of C phases, the first winding of B phases
The other end connect with the other end of the first power switch of B phases, the other end of the second winding of B phases passes through B phase third power switch
Connect with the other end of the 4th power switch of B phases, the intermediate ends of the first winding of C phases, the other end of the first winding of C phases respectively with C
The other end connection of the other end, the first power switch of C phases of the second power switch of phase, the other end of the second winding of C phases pass through C phases
Third power switch is connect with the other end of the 4th power switch of C phases.It is closed with third power switch per the second power switch of phase
When, the output of phase-shifting transformer phase shifting angle is ± 20 °, is disconnected at this time with the 4th power switch per the first power switch of phase；Per phase the
When one power switch and the 4th power switch are closed, the output of phase-shifting transformer phase shifting angle is ± 30 °, at this time the second power switch with
Third power switch disconnects.
The switch motion of phase-shifting transformer is provided by erroneous detection signal.Erroneous detection signal is by H bridge cascading multiple electrical levels
Each submodule of inverter provides.
It is the specific implementation process of the present invention below.
As shown in Figure 1, the DC power supply needed for 7 electrical level inverter of cascade connection type is whole by Power Diode Pumped by the transformer
It is obtained after stream, which has fixed voltage ratio, and the characteristic of phase shifting angle is adjusted.Ia1, ia2, ia3 are the transformation
Device primary side input current；Ig is grid side electric current；T1a, T2a, T3a, T1b, T2b, T3b, T1c, T2c, T3c are the multi-tap
Phase-shifting transformer；Cell 1a、Cell 2a、Cell 3a、Cell 1b、Cell 2b、Cell 3b、Cell 1c、Cell 2c、
Cell 3c are the 7 electrical level inverter submodule of H bridges cascade connection type.When inverter works normally in one embodiment of the invention, ia1
Including frequency is fh=| 18k ± 1 | fgHarmonic wave.When sub-module fault occurs, by the adjustment harmonic current of phase shifting angle because being
System degrades and the f of generationh=| 6k ± 1 | fgIt is changed into fh=| 12k ± 1 | fg.Wherein fgFor fundamental frequency, k=0,1,2 ....
Transformer T3a, T3b, T3c generate+20 ° or+30 ° of phase shifting angle, and transformer T1a, T1b, T1c generate -20 ° or -30 ° of phase shift
Angle.Power switch is connected with default tapping, and the relationship for presetting tap position and winding phase shifting angle is formula (7).
As shown in Fig. 2, the phase shifting angle of transformer is defined as
It is the line voltage vector of transformer primary side and secondary side.
Illustrate in conjunction with Fig. 4, can be released by sine
Because of VbyEqual to Vax, above two formulas be rewritten as
The number of turns and voltage of transformer meet
Wherein,
(4) formula is subtracted (5) formula to obtain：
By above formula it is found that the size of phase shifting angle δ can be adjusted by adjusting the ratio of the number of turns N1, N2, N3.
As shown in figure 3, the relationship of required voltage and phase shifting angle can be derived as by (6) in one embodiment of the invention：
In one embodiment of the invention, primary side line voltage VAB=1440V, secondary sideline voltage Vab=480V, winding N2 correspond to electricity
Press 328.3V, winding N3 corresponding voltages 96.24V.When receive submodule provide erroneous detection signal when, power switch T22 with
Power switch T31 is closed, and the output of phase-shifting transformer phase shifting angle is ± 20 °, and power switch T21 and power switch T32 is disconnected at this time.
When receiving submodule offer erroneous detection signal, when the power switch T21 is closed with switch T32, phase-shifting transformer moves
Phase angle output is ± 30 °, and power switch T22 and power switch T31 is disconnected at this time.Power switch manner of execution depends on cascade connection type
Multi-electrical level inverter is when occurring sub-module fault, system that inverter system is downgraded to corresponding pulse.
In one embodiment of the invention, 7 electrical level inverter of cascade connection type works normally under the conditions of 18 pulse wave, when one son of generation
When module failure, receives submodule and erroneous detection signal is provided, power switch T21 is closed with power switch T32, phase shift transformation
The output of device phase shifting angle is ± 30 °, and power switch T22 and power switch T31 is disconnected at this time.
As shown in Fig. 5 (a), before time tl, 7 electrical level inverter of cascade connection type works normally under the conditions of 18 pulse wave, moves
Phase transformer T1a, the phase angle provided are -20 °；Phase-shifting transformer T2a, the phase angle provided are 0 °；Phase-shifting transformer T3a, provides
Phase angle be ± 20 °.When the t1 moment arrives, a phase inverter sub-module faults occur, a phase inverter output voltages are 0.Such as Fig. 5
(b) shown in, the alternating current harmonic wave of phase-shifting transformer is input to by original f from power gridh=| 18k ± 1 | fgIt is downgraded to fh=|
6k±1|fg.As shown in Fig. 5 (c), Severe distortion occurs for net side a phase currents.Current harmonics concentrates on 250Hz and 350Hz.
As shown in Fig. 6 (a), before time tl, 7 electrical level inverter of cascade connection type works normally under the conditions of 18 pulse wave, moves
Phase transformer T1a, the phase angle provided are -20 °；Phase-shifting transformer T2a, the phase angle provided are 0 °；Phase-shifting transformer T3a, provides
Phase angle be+20 °.When the t1 moment arrives, a phase inverter sub-module faults occur, a phase inverter output voltages are 0.Through too short
Temporary transit time, the corresponding power switch of phase-shifting transformer T3a act.Power switch T21 is closed with power switch T32
It closes, power switch T22 is disconnected with power switch T31.The phase angle that phase-shifting transformer T3a is provided is adjusted to by original+20 °+
30°.As shown in Fig. 6 (b), the alternating current harmonic wave of phase-shifting transformer is input to by original f from power gridh=| 18k ± 1 | fgDrop
Grade is fh=| 6k ± 1 | fg, after of short duration transient process, fh=| 6k ± 1 | fgSubharmonic upgrades to fh=| 12k ± 1 | fg,
Inverter system is operated under the conditions of 12 pulse waves.As shown in Fig. 6 (c), Severe distortion occurs for net side a phase currents.Current harmonics collection
In in 550Hz and 650Hz.
The above are preferred embodiments of the present invention, all any changes made according to the technical solution of the present invention, and generated function is made
When with range without departing from technical solution of the present invention, all belong to the scope of protection of the present invention.
Claims (6)
1. a kind of multi-tap phase-shifting transformer for cascade multilevel inverter, which is characterized in that the phase-shifting transformer is
The primary side winding of three-phase multi-tap combined transformer, the three-phase multi-tap combined transformer is passed through per phase by N1 circle coils
Wye connection is constituted；The vice-side winding of the three-phase multi-tap combined transformer is made of per phase two independent windings, wherein
The windings in series that the winding that umber of turn is N2 is N3 by triangular form connection and umber of turn；The three-phase multi-tap combined type
The vice-side winding of transformer is per mutually with 4 power switch for adjusting phase shifting angle.
2. a kind of multi-tap phase-shifting transformer for cascade multilevel inverter according to claim 1, feature
It is, the power switch uses two-way IGBT or two-way IGCT.
3. a kind of multi-tap phase-shifting transformer for cascade multilevel inverter according to claim 1, feature
It is, the specific connection type of the vice-side winding of the three-phase multi-tap combined transformer is：Umber of turn is in enabling per phase
The winding of N2 is the first winding, and the winding that umber of turn is N3 is the second winding, then one end of the first winding of A phases passes through A phases the
One power switch and one end of the second power switch of A phases, one end of the second winding of A phases, one end of the 4th power switch of A phases, B phases
One end of first winding connects, and the intermediate ends of the first winding of A phases are connect with the other end of the second power switch of A phases, A phases first around
The other end and one end of the first power switch of C phases of group, one end of the second power switch of C phases, the 4th power switch of C phases one
One end connection at end, the second winding of C phases, the other end of the second winding of A phases pass through A phase third power switch and the 4th power of A phases
The other end of switch connects, and the intermediate ends of the first winding of B phases pass through the second power switch of B phases and the one of the first power switch of B phases
One end connection at end, one end of the second winding of B phases, one end of the 4th power switch of B phases, the first winding of C phases, the first winding of B phases
The other end connect with the other end of the first power switch of B phases, the other end of the second winding of B phases passes through B phase third power switch
Connect with the other end of the 4th power switch of B phases, the intermediate ends of the first winding of C phases, the other end of the first winding of C phases respectively with C
The other end connection of the other end, the first power switch of C phases of the second power switch of phase, the other end of the second winding of C phases pass through C phases
Third power switch is connect with the other end of the 4th power switch of C phases.
4. a kind of multi-tap phase-shifting transformer for cascade multilevel inverter according to claim 3, feature
It is, when being closed with third power switch per the second power switch of phase, the output of phase-shifting transformer phase shifting angle is ± 20 °, often at this time
The first power switch of phase and the 4th power switch disconnect；Per the first power switch of phase and when the 4th power switch is closed, phase shift becomes
The output of depressor phase shifting angle is ± 30 °, and the second power switch is disconnected with third power switch at this time.
5. a kind of multi-tap phase-shifting transformer for cascade multilevel inverter according to any one of claims 1 to 4,
It is characterized in that, the switch motion of phase-shifting transformer is provided by erroneous detection signal.
6. a kind of multi-tap phase-shifting transformer for cascade multilevel inverter according to claim 5, feature
It is, erroneous detection signal is provided by each submodule of H bridge cascade multilevel inverters.
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| CN201810305943.3A CN108448905A (en) | 2018-04-08 | 2018-04-08 | A kind of multi-tap phase-shifting transformer for cascade multilevel inverter |
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| CN106160540A (en) * | 2015-05-12 | 2016-11-23 | 富士电机株式会社 | Power-converting device |
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