CN106059326B - A kind of three-phase tri-level Buck type AC-AC converters and its control method - Google Patents
A kind of three-phase tri-level Buck type AC-AC converters and its control method Download PDFInfo
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- CN106059326B CN106059326B CN201610541444.5A CN201610541444A CN106059326B CN 106059326 B CN106059326 B CN 106059326B CN 201610541444 A CN201610541444 A CN 201610541444A CN 106059326 B CN106059326 B CN 106059326B
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Classifications
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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
- H02M5/22—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 discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/275—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 discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/293—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 discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices 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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
-
- 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
- H02M5/22—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 discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/275—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 discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/293—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 discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/2932—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 discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage, current or power
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Ac-Ac Conversion (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
The present invention relates to three-phase tri-level Buck type AC AC converters, including the three-phase tri-level converter unit and three-phase output filter being connected, three-phase tri-level converter unit are connect with three-phase alternating current input power, and three-phase output filter is connected with three-phase alternating current load.Wherein first group of switching tube S1、S'1, the 4th group of switching tube S4、S'4, the first striding capacitance Cfly1, the first output inductor Lf1, the first output filter capacitor Cf1For the first phase A circuitry phases；Second group of switching tube S2、S'2, the 5th group of switching tube S5、S'5, the second striding capacitance Cfly2, the second output inductor Lf2, the second output filter capacitor Cf2For the second phase B circuitry phases；Third group switching tube S3、S'3, the 6th group of switching tube S6、S'6, third striding capacitance Cfly3, third output inductor Lf3, third output filter capacitor Cf3For third phase C circuitry phases.
Description
Technical field
The present invention relates to Technics of Power Electronic Conversion technology, more particularly to a kind of three-phase tri-level Buck type AC-AC converters and
Its control method.
Background technology
AC-AC converter techniques are that a kind of AC energy is converted to the technology of another AC energy.
Three level AC-AC converters include mainly three level AC-AC converters of matrix form, three level AC-AC of cross-straight-intersection
Three three kinds of structures of level AC-AC converters of converter and pulsewidth modulation.So far, domestic and international researcher is for matrix form three
Level AC-AC converters and three level AC-AC converters of cross-straight-intersection have been carried out to be studied in detail and adequately relatively.For arteries and veins
Three level AC-AC converters of wide modulation are concentrated mainly on the research of single-phase three level AC-AC converters.
And three-phase tri-level rectifier and three-phase tri-level are then focused primarily upon for the research of three-phase tri-level converter
The research of inverter lacks the research to three-phase tri-level buck AC-AC converters.
Invention content
In order to solve the above technical problems, the object of the present invention is to provide one kind having succinct topological structure, output voltage wave
The three-phase tri-level Buck type AC-AC converters and its control method that shape is high-quality, output filter volume weight is small, will be original
Stable or unstable three-phase high-voltage alternating current, reduced output voltage are single-stage AC- at stable or adjustable three-phase alternating current output voltage
The circuit structure of AC power conversions.
The three-phase tri-level Buck type AC-AC converters of the present invention, including the three-phase tri-level converter unit that is connected and
Three-phase output filter, wherein
The three-phase tri-level converter unit is connect with three-phase alternating current input power, is used for input voltage in its output
Side is changed into 0,1/2,1 times of input voltage, three kinds of level, including first group of switching tube S1、S'1, second group of switching tube S2、S'2,
Three groups of switching tube S3、S'3, the 4th group of switching tube S4、S'4, the 5th group of switching tube S5、S'5, the 6th group of switching tube S6、S'6, first fly
Across capacitance Cfly1, the second striding capacitance Cfly2, third striding capacitance Cfly3；
The high order that the three-phase output filter is used to filter out in the output voltage of the three-phase tri-level converter unit is humorous
Wave is loaded with three-phase alternating current and is connected, including the first output inductor Lf1, the first output filter capacitor Cf1, second output filtering
Inductance Lf2, the second output filter capacitor Cf2, third output inductor Lf3With third output filter capacitor Cf3；
First group of switching tube S1、S'1, second group of switching tube S2、S'2, third group switching tube S3、S'3One end difference
Connect with each phase high input voltage power supply of the three-phase alternating current input power, the other end respectively with the 4th group of switching tube S4、S'4With
First output inductor Lf1, the 5th group of switching tube S5、S'5With the second output inductor Lf2, the 6th group of switching tube S6、S'6With
Third output inductor Lf3One end be connected, the 4th group of switching tube S4、S'4, the 5th group of switching tube S5、S'5With the 6th group of switch
Pipe S6、S'6The other end be connected to a point G jointly；
The first striding capacitance Cfly1, the second striding capacitance Cfly2, third striding capacitance Cfly3One end respectively with first
Group switching tube S1、S'1Common end, second group of switching tube S2、S'2Common end, third group switching tube S3、S'3Common end phase
Even, the other end respectively with the 4th group of switching tube S4、S'4Common end, the 5th group of switching tube S5、S'5Common end, the 6th group open
Close pipe S6、S'6Common end be connected；
The first output inductor Lf1The other end and the first output filter capacitor Cf1One end, second output filter
Wave inductance Lf2The other end and the second output filter capacitor Cf2One end, third output inductor Lf3The other end and third
Output filter capacitor Cf3One end respectively with the three-phase alternating current load be respectively connected to a bit, the first output filter capacitor
Cf1, the second output filter capacitor Cf2, third output filter capacitor Cf3The other end be connected to a point H jointly.
Further, each first group of switching tube S1、S'1, second group of switching tube S2、S'2, third group switching tube S3、S
'3, the 4th group of switching tube S4、S'4, the 5th group of switching tube S5、S'5, the 6th group of switching tube S6、S'6Include that two forward directions are concatenated
Power switch tube.
Further, the first output filter capacitor Cf1, the second output filter capacitor Cf2, third output filter capacitor
Cf3Star-like connection or triangle connection.
Further, first group of switching tube S1、S'1, second group of switching tube S2、S'2, third group switching tube S3、S'3's
Duty ratio is D, the 4th group of switching tube S4、S'4, the 5th group of switching tube S5、S'5, the 6th group of switching tube S6、S'6Duty ratio be 1-
D；
The drive signal of two power switch tubes of each group switching tube differs 180 ° of phases, wherein in first group of switching tube
S1With S in the 4th group of switching tube4Drive signal is complementary, S' in first group of switching tube1With S' in the 4th group of switching tube4Drive signal
It is complementary；S in second group of switching tube2With S in the 5th group of switching tube5Drive signal is complementary, S' in second group of switching tube2With the 5th group
S' in switching tube5Drive signal is complementary；S in third group switching tube3With S in the 6th group of switching tube6Drive signal is complementary, third group
S' in switching tube3With S' in the 6th group of switching tube6Drive signal is complementary.
The control method of the three-phase tri-level Buck type AC-AC converters of the present invention controls first striding capacitance
Cfly1The voltage at the both ends half of input line voltage, first between the first phase and the second phase of the three-phase alternating current input power
The mutually maximum value between third phase in the half and no-voltage three of input line voltage；Control the second striding capacitance Cfly2Both ends
Voltage be three-phase alternating current input power the second phase and the first phase between input line voltage half, the second phase and third phase it
Between input line voltage half and no-voltage three in maximum value；Control third striding capacitance Cfly3The voltage at both ends is three-phase
Input line voltage between the half of input line voltage, third phase and the second phase between the third phase of alternating current input power supplying and the first phase
Half and no-voltage three in maximum value, you can so that the input voltage of three-phase alternating current input power is converted in three-phase tri-level
The outlet side of unit is changed into 0,1/2,1 times of input voltage, three kinds of level, is obtained after the filtering of three-phase output filter high-quality
The sinusoidal output voltage of amount, the output voltage are less than or equal to input voltage.
According to the above aspect of the present invention, the present invention has at least the following advantages：
The present invention is to realize the key technology base of Three phase electric power electric transformer and three phase sine AC voltage regulator etc.
Plinth is with a wide range of applications in the high pressures high power three-phase AC-AC transformation of electrical energy occasions such as civilian, industrial and military.Relatively
In two level Buck type AC-AC converters of three-phase, due to introducing three level, which reduces the voltage of device for power switching
Stress is suitable for three-phase high-voltage input and powerful application scenario, and reduces the higher hamonic wave in output voltage waveforms, changes
Output voltage waveforms quality has been apt to it, the volume weight of output filter can be greatly reduced, has reduced the production cost of converter, carry
High transformation of electrical energy efficiency and power density.
Above description is only the general introduction of technical solution of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, below with presently preferred embodiments of the present invention and after coordinating attached drawing to be described in detail such as.
Description of the drawings
Fig. 1 is three-phase tri-level Buck types AC-AC converter topology figures of the present invention；
The working state figure of Fig. 2 each switching tubes when being corresponding input voltage minimum phase；
Fig. 3 is duty ratio D>When first phase A phases are non-minimum phase when 0.5, first group of switching tube and the 4th group of switching tube drive
Dynamic waveform expanded view；
Fig. 4 is duty ratio D<When first phase A phases are non-minimum phase when 0.5, first group of switching tube and the 4th group of switching tube drive
Dynamic waveform expanded view.
Specific implementation mode
With reference to the accompanying drawings and examples, the specific implementation mode of the present invention is described in further detail.Implement below
Example is not limited to the scope of the present invention for illustrating the present invention.
In conjunction with Fig. 1, the circuit topological structure of three-phase tri-level Buck types AC-AC converters of the present invention, by sequentially connected
Three-phase high-voltage input voltage source, three-phase tri-level converter unit, three-phase output filter and three-phase alternating current load composition.The circuit
Structure can will stablize or unstable three-phase high-voltage input AC electricity, decompression are converted into the stabilization of identical frequency or adjustable three-phase
Export sinusoidal ac.Wherein first group of switching tube S1、S'1, the 4th group of switching tube S4、S'4, the first striding capacitance Cfly1, first
Output inductor Lf1, the first output filter capacitor Cf1For the first phase A circuitry phases, switching tube S'1, switching tube S'4It is defeated with first
Go out filter inductance Lf1It is connected to a point A1；Second group of switching tube S2、S'2, the 5th group of switching tube S5、S'5, the second striding capacitance
Cfly2, the second output inductor Lf2, the second output filter capacitor Cf2For the second phase B circuitry phases, switching tube S'2, switching tube S'5
With the second output inductor Lf2It is connected to a point B1；Third group switching tube S3、S'3, the 6th group of switching tube S6、S'6, third fly
Across capacitance Cfly3, third output inductor Lf3, third output filter capacitor Cf3For third phase C circuitry phases, switching tube S'3, open
Close pipe S'6With third output inductor Lf3It is connected to a point C1.
Due to the converter three-phase symmetrical, only illustrated below with the first phase A phases：First phase high input voltage power supply uia
With first group of switching tube S1、S'1One end is connected, first group of switching tube S1、S'1The other end and the 4th group of switching tube S4、S'4With first
Output inductor Lf1It is connected, the first striding capacitance Cfly1One end and first group of switching tube S1、S'1Common end be connected, the other end with
4th group of switching tube S4、S'4Common end is connected, the first output inductor Lf1The other end and the first output filter capacitor Cf1And friendship
Current load is connected；4th group of switching tube S4、S'4, the 5th group of switching tube S5、S'5With the 6th group of switching tube S6、S'6Another termination
In point a G, the first output filter capacitor Cf1, the second output filter capacitor Cf2, third output filter capacitor Cf3It is another to be terminated at one
Point H.First group of switching tube S1、S'1, second group of switching tube S2、S'2, third group switching tube S3、S'3, the 4th group of switching tube S4、S'4、
5th group of switching tube S5、S'5, the 6th group of switching tube S6、S'6, the first striding capacitance Cfly1, the second striding capacitance Cfly2, third fly
Across capacitance Cfly3Constitute three-phase tri-level converter unit, the first output inductor Lf1, the first output filter capacitor Cf1, it is second defeated
Go out filter inductance Lf2, the second output filter capacitor Cf2, third output inductor Lf3, third output filter capacitor Cf3Constitute three
Phase output filter.Three-phase tri-level converter unit is connected with three-phase high-voltage input power, and three-phase high-voltage input power is inputted
Voltage is changed into 0,1/2 times of input voltage, one times of input voltage, three kinds of level in three-phase tri-level converter unit outlet side；Three-phase
Output filter filters out the higher hamonic wave in three-phase tri-level converter unit output voltage, to provide height for three-phase alternating current load
The stabilization of quality or adjustable three phase sine ac output voltage, the output voltage are not more than input voltage.
The basic functional principle of three-phase tri-level Buck type AC-AC converters is as follows：It (is accounted for according to different output voltage sizes
Sky ratio D>0.5 or D<0.5) the three-phase tri-level Buck type AC-AC converters, controlled using pulsewidth modulation (PWM) can be not
With when duty ratio to different input line voltages carry out copped wave, three-phase output filter inductance front end accordingly obtain 0,1/2 times it is defeated
Line voltage, one times of input line voltage, three kinds of level, using three-phase output filter filter after can obtain high-quality stable or
Adjustable three phase sine alternating current.
It is the striding capacitance place mutually input line voltage between input voltage minimum phase by the control of striding capacitance both end voltage
Half.According to the size of three-phase input voltage, the working condition of converter can be divided into three categories：(a), the first phase A phases are minimum,
(b), the second phase B phases are minimum, (c), third phase C phase minimums；It can be by each above-mentioned work further according to the polarity of another two-phase voltage
State is sub-divided into three groups, and (a) kind working condition can be divided into：1., the second phase B phases be just, third phase C phases be it is negative, 2., the
Two-phase B phases be just, third phase C phases be just, 3., the second phase B phases be negative, third phase C phases are just；(b) kind working condition can divide
For：4., the first phase A phases be negative, third phase C phases be just, 5., the first phase A phases be just, third phase C phases be just, 6., the first phase A phases
For just, third phase C phases be negative；(c) kind working condition can be divided into：7., the first phase A phases be just, the second phase B phases be it is negative, 8., the
One phase A phases be just, the second phase B phases be just, 9., the first phase A phases be negative, the second phase B phases are just.
([the t shown in attached drawing 2 by taking working condition (b) as an example belowa,tb], the second phase B phases input voltage is minimum at this time, and second
Group switching tube S2、S'2With the 5th group of switching tube S5、S'5Normal open).As duty ratio D>When 0.5, it is analyzed as follows：
(1) such as [t in Fig. 30,t1] period switch mode 1
t0Moment, first group of switching tube S1、S'1, third group switching tube S3、S'3Conducting；4th group of switching tube S4、S'4, the
Six groups of switching tube S6、S'6Shutdown.First output inductor Lf1, third output inductor Lf3Storage energy, electric current are linear
Rise；First striding capacitance Cfly1, third striding capacitance Cfly3Both end voltage is constant；Three-phase tri-level converter unit outlet side electricity
Press uo-abFor one times of input line voltage uiab, uo-cbFor one times of input line voltage uicb；
(2) such as [t in Fig. 31,t2] period switch mode 2
t1Moment, first group of switching tube S1、S'1In switching tube S1, third group switching tube S3、S'3In switching tube S3, the
Four groups of switching tube S4、S'4In switching tube S'4, the 6th group of switching tube S6、S'6In switching tube S'6Conducting；First group of switching tube
S1、S'1In switching tube S'1, third group switching tube S3、S'3In switching tube S'3, the 4th group of switching tube S4、S'4In switching tube
S4, the 6th group of switching tube S6、S'6In switching tube S6Shutdown.First output inductor Lf1, third output inductor Lf3It releases
Exoergic amount, electric current linear decline；First striding capacitance Cfly1, third striding capacitance Cfly3Charging, both end voltage rise；Three
Three level translation unit outlet side voltage u of phaseo-abFor 1/2 times of input line voltage uiab, uo-cbFor 1/2 times of input line voltage uicb；
(3) such as [t in Fig. 32,t3] period switch mode 3
t2Moment, first group of switching tube S1、S'1, third group switching tube S3、S'3Conducting；4th group of switching tube S4、S'4, the
Six groups of switching tube S6、S'6Shutdown.The course of work is identical as mode 1；
(4) such as [t in Fig. 33,t4] period switch mode 4
t3Moment, first group of switching tube S1、S'1In switching tube S'1, third group switching tube S3、S'3In switching tube S'3,
4th group of switching tube S4、S'4In switching tube S4, the 6th group of switching tube S6、S'6In switching tube S6Conducting；First group of switching tube
S1、S'1In switching tube S1, third group switching tube S3、S'3In switching tube S3, the 4th group of switching tube S4、S'4In switching tube
S'4, the 6th group of switching tube S6、S'6In switching tube S'6Shutdown.Working condition is similar to mode 2, and difference lies at this time first to fly
Across capacitance Cfly1, third striding capacitance Cfly3Electric discharge, both end voltage decline.
As working condition (b), duty ratio D<When 0.5, it is analyzed as follows：
(1) such as [t in Fig. 46,t7] period switch mode 1
t6Moment, the 4th group of switching tube S4、S'4, the 6th group of switching tube S6、S'6Conducting；First group of switching tube S1、S'1, the
Three groups of switching tube S3、S'3Shutdown.First output inductor Lf1, third output inductor Lf3It releases energy, electric current is linear
Decline；First striding capacitance Cfly1, third striding capacitance Cfly3Both end voltage is constant, three-phase tri-level converter unit outlet side electricity
Press uo-ab、uo-cbIt is 0；
(2) such as [t in Fig. 47,t8] period switch mode 2
t7Moment, first group of switching tube S1、S'1In S'1, third group switching tube S3、S'3In S'3, the 4th group of switching tube
S4、S'4In S4, the 6th group of switching tube S6、S'6In S6Conducting；First group of switching tube S1、S'1In S1, third group switching tube
S3、S'3In S3, the 4th group of switching tube S4、S'4In S'4, the 6th group of switching tube S6、S'6In S'6Shutdown.First output filter
Wave inductance Lf1, third output inductor Lf3Storage energy, electric current linear rise；First striding capacitance Cfly1, third fly across
Capacitance Cfly3Electric discharge, both end voltage decline, three-phase tri-level converter unit outlet side voltage uo-abFor 1/2 times of input line voltage
uiab, uo-cbFor 1/2 times of input line voltage uicb；
(3) such as [t in Fig. 48,t9] period switch mode 3
t8Moment, the 4th group of switching tube S4、S'4, the 6th group of switching tube S6、S'6Conducting；First group of switching tube S1、S'1, the
Three groups of switching tube S3、S'3Shutdown.Working condition is identical as mode 1；
(4) such as [t in Fig. 49,t10] period switch mode 4.
t9Moment, first group of switching tube S1、S'1In S1, third group switching tube S3、S'3In S3, the 4th group of switching tube S4、
S'4In S'4, the 6th group of switching tube S6、S'6In S'6Conducting；First group of switching tube S1、S'1In S'1, third group switching tube
S3、S'3In S'3, the 4th group of switching tube S4、S'4In S4, the 6th group of switching tube S6、S'6In S6Shutdown, the course of work and mould
State 2 is similar, and difference lies in the first striding capacitance C at this timefly1, third striding capacitance Cfly3Charging, both end voltage rise.
By being analyzed above it is found that working as duty ratio D>When 0.5, the outlet side voltage of three-phase tri-level converter unit is 1/2
Times copped wave between input line voltage and one times of input line voltage；As duty ratio D<When 0.5, the output of three-phase tri-level converter unit
The copped wave between 0 and 1/2 times of input line voltage of side voltage.
The above is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is several improvement and
Modification, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (1)
1. a kind of control method of three-phase tri-level Buck types AC-AC converters, it is characterised in that：
The three-phase tri-level Buck types AC-AC converters, including the three-phase tri-level converter unit and three-phase that are connected export
Filter, wherein
The three-phase tri-level converter unit is connect with three-phase alternating current input power, for turning input voltage in its outlet side
Become 0,1/2,1 times of input voltage, three kinds of level, including first group of switching tube S1、S'1, second group of switching tube S2、S'2, third group
Switching tube S3、S'3, the 4th group of switching tube S4、S'4, the 5th group of switching tube S5、S'5, the 6th group of switching tube S6、S'6, first fly across electricity
HoldC fly1, the second striding capacitanceC fly2, third striding capacitanceC fly3；
The three-phase output filter is used to filter out the higher hamonic wave in the output voltage of the three-phase tri-level converter unit,
It loads and connects with three-phase alternating current, including the first output inductorL f1, the first output filter capacitorC f1, second output filtered electrical
SenseL f2, the second output filter capacitorC f2, third output inductorL f3With third output filter capacitorC f3；
First group of switching tube S1、S'1, second group of switching tube S2、S'2, third group switching tube S3、S'3One end respectively with institute
State three-phase alternating current input power each phase high input voltage power supply connection, the other end respectively with the 4th group of switching tube S4、S'4With first
Output inductorL f1, the 5th group of switching tube S5、S'5With the second output inductorL f2, the 6th group of switching tube S6、S'6And third
Output inductorL f3One end be connected, the 4th group of switching tube S4、S'4, the 5th group of switching tube S5、S'5With the 6th group of switching tube
S6、S'6The other end be connected to a point G jointly；
First striding capacitanceC fly1, the second striding capacitanceC fly2, third striding capacitanceC fly3One end opened respectively with first group
Close pipe S1、S'1Common end, second group of switching tube S2、S'2Common end, third group switching tube S3、S'3Common end be connected, separately
One end respectively with the 4th group of switching tube S4、S'4Common end, the 5th group of switching tube S5、S'5Common end, the 6th group of switching tube S6、
S'6Common end be connected；
First output inductorL f1The other end and the first output filter capacitorC f1One end, the second output inductorL f2The other end and the second output filter capacitorC f2One end, third output inductorL f3The other end and third output filter
Wave capacitanceC f3One end respectively with the three-phase alternating current load be respectively connected to a bit, the first output filter capacitorC f1, second
Output filter capacitorC f2, third output filter capacitorC f3The other end be connected to a point H jointly；
Control first striding capacitanceC fly1The voltage at both ends be the three-phase alternating current input power the first phase and the second phase it
Between maximum value between the half of input line voltage, the first phase and third phase in the half and no-voltage three of input line voltage；
Control the second striding capacitanceC fly2The voltage at both ends input line electricity between the second phase and the first phase of three-phase alternating current input power
Maximum value between the half of pressure, the second phase and third phase in the half and no-voltage three of input line voltage；Third is controlled to fly
Across capacitanceC fly3The voltage at both ends be three-phase alternating current input power third phase and the first phase between input line voltage half, the
Maximum value between three-phase and the second phase in the half of input line voltage and no-voltage three, you can make three-phase alternating current input power
Input voltage be changed into 0,1/2,1 times of input voltage, three kinds of level in the outlet side of three-phase tri-level converter unit, by three
The sinusoidal output voltage of high quality is obtained after the filtering of phase output filter, which is less than or equal to input voltage.
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| CN110572028A (en) * | 2019-09-26 | 2019-12-13 | 哈尔滨工业大学 | DC/DC converter based on switch capacitor and resonance SEPIC circuit |
| CN113224954B (en) * | 2021-04-16 | 2022-11-04 | 东北电力大学 | Switched capacitor type three-phase autotransformer |
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| CN103326606A (en) * | 2013-06-09 | 2013-09-25 | 浙江大学 | One-phase five-level inverter |
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