CN105897017B - Three-phase line voltage cascades VIENNA converter - Google Patents
Three-phase line voltage cascades VIENNA converter Download PDFInfo
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- CN105897017B CN105897017B CN201610325778.9A CN201610325778A CN105897017B CN 105897017 B CN105897017 B CN 105897017B CN 201610325778 A CN201610325778 A CN 201610325778A CN 105897017 B CN105897017 B CN 105897017B
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal 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 in a bridge configuration
-
- 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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/2173—Conversion of ac power input into dc power output without possibility of reversal 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 in a biphase or polyphase circuit arrangement
-
- 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
-
- 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
- H02M1/0083—Converters characterised by their input or output configuration
- H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs
Abstract
The present invention discloses a kind of novel three-phase line voltage cascade VIENNA converter, belongs to AC/DC converter.The converter includes star-like connection and without the three-phase alternating-current supply of the neutral conductor, nine input inductance and three three-phase VIENNA converters being concatenated together.The present invention reduces the voltage stress of switching tube using the connection type of three-phase input line voltage cascaded superposition, promotes voltage class, the converter is made to be suitably applied in high-power grade occasion；And DC side can export same or different voltage, can power simultaneously for multichannel loading；Active power factor correction may be implemented, have the function of reducing total harmonic distortion THD；Compared with three-phase fully-controlled type Cascade H bridge rectifier, cascade rectifier proposed by the invention can be less with 27 full-control type power semiconductor devices in cascade module number identical (such as being three module-cascades).Compared with the rectifier all using full-control type power semiconductor device using same three-phase bridge line voltage cascaded, the full-control type power semiconductor device of half is then used less, and the resistance to pressure request of each full-control type power semiconductor device reduces half, reduces the cost and volume of converter.
Description
Technical field
The present invention relates to a kind of novel circuit topological structure of AC/DC converter and its applications, more particularly to a kind of energy
It enough applies in high-power grade occasion, and VIENNA transformation can be cascaded simultaneously for the three-phase line voltage of multichannel loading power supply
Device.
Background technique
In recent years, " multi-level power converter " (Multilevel Converter) is in high-tension high-power frequency conversion tune
The application that the fields such as speed, active power filtering, high voltage direct current (HVDC) transmission of electricity and power system reactive power compensation have been succeeded.
The basic circuit topological structure of multi-level converter is broadly divided into Clamp and unit cascaded type two major classes, for example, existing at present
The three level mesohigh frequency conversion of diode clamp bit-type produced by Siemens Company or ABB AB being used widely in industry
Device, and be exactly the allusion quotation of these two types of products by the cascaded H-bridges medium-high voltage frequency converter that sieve guest Kanggong department or Li Dehuafu company produce
Type represents.In these two types of medium-high voltage frequency converters no matter which kind of, in order to application low pressure resistance power semiconductor device complete height
The rectification of voltage has used that bulky, wiring is complicated, expensive power frequency phase-shifting transformer in rectification input side, this
It is restricted it in the application of many industrial occasions.
No industrial frequency transformer cascade multi-level converter, receives significant attention in power electronics field in recent years.
European Union and the U.S. put into great effort, are adapted to grid-connected power generation system access for this quasi-converter as building, meet and divide
The smart grid interface of cloth power generation needs has made intensive studies.And Japan then becomes no industrial frequency transformer cascade multi-level
Parallel operation is analyzed as next-generation mesohigh varying-voltage frequency converter.Two-way DC/DC transformation is isolated in such converter using high frequency
It is complete using cascade to eliminate the phase-shifting transformer in traditional tandem type converter, two sides or high-pressure side for device transmitted in both directions energy
Control H bridge (or cascade MMC) multi-level power converter structure.It substantially reduces system bulk, reduce system weight.However,
This quasi-converter also has the shortcomings that obvious, is mainly manifested in: each module of cascade rectifier (or inversion) grade and two-way DC/DC become
It changes the mold block and uses more wholly-controled device, these wholly-controled devices involve great expense, and increase system cost；In operational process
Switching loss is big, affects system whole efficiency；Control circuit and control algorithm design are complicated.In fact, in considerable reality
Border industrial applications, energy do not need to transmit in both direction.The quasi-converter is in blower, the pump for not needing energy feedback
The application in class energy saving motor speed regulation field has no clear superiority.This be also restrict quasi-converter functionization key factor it
One.
The invention patent proposes a kind of energy one direction transmission as shown in Figure 1, does not need that bulky, wiring is multiple
Miscellaneous, expensive power frequency phase-shifting transformer can complete the cascade multi-level converter topology of rectification under high voltages.This is new
Code converter topology can be used as the rectification stage of mesohigh varying-voltage frequency converter of new generation, complete unity power factor under high voltages
Rectification.Compared with three-phase fully-controlled type Cascade H bridge rectifier, cascade rectifier proposed by the invention is identical in cascade module number
(such as being three module-cascades) can be less with 27 full-control type power semiconductor devices.With all using full-control type electric power half
Conductor device is compared using the rectifier of same three-phase bridge line voltage cascaded, then uses the full-control type power semiconductor device of half less
Part, and the resistance to pressure request of each full-control type power semiconductor device reduces half.
Summary of the invention
In view of the above shortcomings of the prior art, the purpose of the present invention is to provide one kind can apply in the big function of high pressure
Rate grade occasion and the three-phase line voltage cascade VIENNA converter for being able to achieve active power factor correction.The structure of circuit itself
Feature makes the converter in the identical situation of cascade series, it is possible to reduce active switch pipe number reduces switching loss, save at
This.
Goal of the invention of the invention is achieved by following technical proposals: three-phase line voltage cascades VIENNA transformation
Device, which is characterized in that its second level cascaded topology includes:
Star-like connection and three-phase input power supply u without the neutral conductora、ub、uc；
Nine with the concatenated input boost inductance L of every phase bridge arma1、Lb1、Lc1, La2、Lb2、Lc2, La3、Lb3、Lc3, inductance
Be worth it is identical, wherein the output end of three boost inductances connecting with three phase mains, is denoted as A, B, C respectively；
Three completely identical in structure phase three-wire three VIENNA converters, three three-phase bridges correspond to the company of two bridge arms of phase or more
Contact is denoted as A1, B1, C1, A2, B2, C2 and A3, B3, C3 respectively；Each phase three-wire three VIENNA converter is by 3 two-way function
Rate switch KA、KB、KC, 6 fast recovery rectifier diode Daf+、Daf-、Dbf+、Dbf-、Dcf+、Dcf-With two groups of direct current output capacitor Cf1、
Cf2, an ohmic load R composition, wherein direct current output capacitor Cf1、Cf2Series connection, and it is in parallel with ohmic load R；Bidirectional power is opened
Close KA、KB、KCOne end be connected with bridge arm tie point, the other end and direct current output capacitor Cf1、Cf2Midpoint be connected；Bridge in every phase
The diode D of armaf+、Dbf+、Dcf+Cathode and capacitor Cf1Anode connect together, the diode D of every phase lower bridge armaf-、Dbf-、Dcf-
Anode and capacitor Cf2Cathode connect together.Each bidirectional switch module is by 1 IGBT (SA、SB、SC) and 4 it is end to end
Diode (D(a、b、c)K+、D(a、b、c)K-、D(a、b、c)M+、D(a、b、c)M-) composition；Six outputs electricity of three three-phase VIENNA converters
Appearance is denoted as C respectivelyaf1、Caf2、Cbf1、Cbf2、Ccf1、Ccf2, three load resistances are denoted as R respectively1、R2、R3；Three groups of direct current output electricity
Pressure is denoted as U respectivelyO1、UO2、UO3；
Three three-phase VIENNA converters be by the line voltage cascaded of input side together, specific connection type are as follows: A
Mutually input inductance La1Output terminals A be connected with A1, B1 pass through inductance Lb1、La2It is connected with A2, B2 and B phase inputs inductance Lb2It is defeated
Outlet B is connected, and C2 passes through inductance Lc2、Lb3It is connected with B3, C3 and C phase inputs inductance Lc3Output end C be connected, A3 passes through inductance
La3、Lc1It is connected with C1.As shown in Figure 1.
Structure according to Fig. 1 can draw the simplification connection structure of two-level concatenation three-phase VIENNA converter, such as Fig. 2 institute
Show.The exchange side line voltage of structure according to Fig.2, cascade three-phase VIENNA converter can indicate are as follows:
The subelement of the converter is completely identical in structure phase three-wire three VIENNA converter；The switching tube used is complete
Control type power semiconductor device, may be implemented unity power factor.
It is available by 6 three-phase VIENNA by the construction thinking of the three-phase bridge inverter topology of above-mentioned two-level concatenation
The phase three-wire three VIENNA converter for the three-stage cascade that converter subelement is constituted, specific connection type are as follows: A phase inputs inductance La1
Output terminals A be connected with A1, B1 is connected by inductance with A2, and B2 passes through inductance and is connected with A3, and B3 and B phase inputs inductance Lb3It is defeated
Outlet B is connected, and C3 is connected by inductance with B4, and C4 is connected by inductance with B5, and C5 and C phase inputs inductance Lc5Output end C phase
Even, A6 is connected by inductance with C1, and A5 is connected by inductance with C6, and A4, C2 are connected by inductance with B6, as shown in Figure 3.
Structure according to Fig.3, can draw the simplification connection structure of three-stage cascade three-phase VIENNA converter, such as Fig. 4 institute
Show.The exchange side line voltage of structure according to Fig.4, cascade three-phase VIENNA converter can indicate are as follows:
N grades of cascades are extended to by the extended method that two-level concatenation obtains three-stage cascade topology.Three-phase cascade for n grades
The expression formula of bridging parallel operation, exchange side line voltage should be
From formula (3): three-phase bridge converter cascade for n grades, by (3n-3) a three-phase VIENNA converter module
It constitutes, needs (9n-9) a active switch and (6n-6) a direct current output capacitor altogether；Connection relationship between disparate modules bridge arm can
It is obtained by the formula, the bridge arm being wherein not directed in formula is attached in a certain way by inductance.By above-mentioned extension side
The topological Simplification connection figure for 4 grades to the 7 grades cascade three-phase VIENNA converters that method obtains is shown in Fig. 5-Fig. 7 respectively.
The invention has the following beneficial effects:
1. since three-phase cascade connection type VIENNA converter of the invention is cascaded between line voltage by three-phase input power supply
And constitute, it can not only inherit the following advantages of VIENNA converter: can be realized unity power factor control；On power device
Voltage stress be DC bus-bar voltage half, the active switch pipe and fast recovery diode of low pressure can be used；Inductive current
Continuously；Power density is high, and input current ripple reduces, so that inductance volume reduces；Resistance characteristic is presented in rectifier, and voltage is uneven
It still can work under the conditions of weighing apparatus and phase shortage；But also can use three-phase input line voltage cascaded superposition connection type with into
One step reduces the voltage stress of switching tube, promotes voltage class, the converter is made to be suitably applied in high-power grade occasion；
And DC side can export same or different voltage, can power simultaneously for multichannel loading.
2. by circuit structure it is found that the every phase of three-phase fully-controlled type Cascade H bridge rectifier using three module-cascades needs three
A single-phase H bridge cascade composition, each H bridge need 4 full-control type power semiconductor devices, need 36 full-control type electric power half in total
Conductor device；All use the three-phase rectifier of same three-phase bridge line voltage cascaded by three using full-control type power semiconductor device
A three-phase bridge rectification module cascade composition, each module need to use 6 full-control type power semiconductor devices, need in total 18 it is complete
Control type power semiconductor device；And cascade rectifier proposed by the invention (such as is three when cascade module number is identical
Module-cascade) 9 full-control type power semiconductor devices are only needed, it, can be less with 27 compared with three-phase fully-controlled type Cascade H bridge rectifier
A full-control type power semiconductor device, with all using full-control type power semiconductor device use same three-phase bridge line voltage cascaded
Three-phase rectifier compare, then use the full-control type power semiconductor device of half, and each full-control type power semiconductor device less
Resistance to pressure request reduce half, so as to reduce converter production cost and volume.
3. the converter not only can be using current phase real-time tracking voltage-phase under traditional three-phase static coordinate system
Double-closed-loop control, i.e., each bridge arm current has a control method of electric current loop, the present invention also propose two kinds it is simpler more optimized
Control method to realize tracking of the alternating current to power phase, realize the more of unity power factor operation and DC side
Output is stablized on road, can not only meet the requirement in Practical Project to current total harmonic distortion THD≤5%, but also can reduce cascaded transformation
The complexity of device control system.Three kinds of control mode advantage and disadvantage are obvious, can be according to control requirement and parameter request in engineer application
It is selected.
4. the present invention maintains the advantages of tradition cascade code converter: the structure of each converter subelement is identical, is easy
Carry out modularized design, debugging, installation etc..Switching device voltage stress is low to be suitably applied in high-power grade occasion.
Detailed description of the invention
The following further describes the present invention with reference to the drawings.
Fig. 1 is two-level concatenation three-phase VIENNA converter circuit topology；
Fig. 2 is the simplification connection structure diagram of two-level concatenation three-phase VIENNA converter；
Fig. 3 is three-stage cascade three-phase VIENNA converter circuit topology；
Fig. 4 is the simplification connection structure diagram of three-stage cascade three-phase VIENNA converter；
Fig. 5 is the simplification connection structure diagram that level Four cascades three-phase VIENNA converter；
Fig. 6 is the simplification connection structure diagram that Pyatyi cascades three-phase VIENNA converter；
Fig. 7 is the simplification connection structure diagram of six grades of cascade three-phase VIENNA converters；
Fig. 8 is two-level concatenation three-phase VIENNA convertor controls block diagram；
Fig. 9 is two-level concatenation three-phase VIENNA converter optimal control block diagram；
Figure 10 is two-level concatenation three-phase VIENNA converter optimal control block diagram；
Specific embodiment
Embodiments of the present invention and working principle are further described with reference to the accompanying drawing:
As shown in Figure 1, three-phase line voltage of the invention cascades VIENNA converter, which is characterized in that its two-level concatenation is opened up
It flutters and includes:
Star-like connection and three-phase input power supply u without the neutral conductora、ub、uc；
Nine with the concatenated input boost inductance L of every phase bridge arma1、Lb1、Lc1, La2、Lb2、Lc2, La3、Lb3、Lc3, inductance
It is worth identical, the output end of three boost inductances connecting with three phase mains is denoted as A, B, C respectively；
Three completely identical in structure phase three-wire three VIENNA converters, three three-phase bridges correspond to the company of two bridge arms of phase or more
Contact is denoted as A1, B1, C1, A2, B2, C2 and A3, B3, C3 respectively；Each phase three-wire three VIENNA converter is by 3 two-way function
Rate switch KA、KB、KC, 6 fast recovery rectifier diode Daf+、Daf-、Dbf+、Dbf-、Dcf+、Dcf-With two groups of direct current output capacitor Cf1、
Cf2, an ohmic load R composition.Six output capacitances of three three-phase VIENNA converters are denoted as C respectivelyaf1、Caf2、Cbf1、
Cbf2、Ccf1、Ccf2；Three load resistances are denoted as R respectively1、R2、R3；Three groups of DC output voltage are denoted as U respectivelyO1、UO2、UO3；Note
The electric current for flowing out each bridge arm is iki(k=a, b, c；I=1,2,3)；The voltage value of six output capacitances is denoted as u respectivelydc1、
udc2、udc3、udc4、udc5、udc6。
Three three-phase VIENNA converters be by the line voltage cascaded of input side together, specific connection type are as follows: A
Mutually input inductance La1Output terminals A be connected with A1, B1 pass through inductance Lb1、La2It is connected with A2, B2 and B phase inputs inductance Lb2It is defeated
Outlet B is connected, and C2 passes through inductance Lc2、Lb3It is connected with B3, C3 and C phase inputs inductance Lc3Output end C be connected, A3 passes through inductance
La3、Lc1It is connected with C1.As shown in Figure 1.
It is convenient for following analysis the working principle of the invention and its performance characteristics, now do following hypothesis: three phase mains it is interior
Resistance is 0；Each submodule component parameters are identical, and switching is perfect switch；Each mutually input boost inductance and output filter
Wave capacitor is equal, is denoted as La1=Lb1=Lc1=La2=Lb2=Lc2=La3=Lb3=Lc3=L, Caf1=Caf2=Cbf1=Cbf2=
Ccf1=Ccf2=C, and equivalent resistance is not present；Three load resistance resistance values are equal, are denoted as R1=R2=R3=R.
The active switch driving signal that cascade three three-phases VIENNA converter corresponds to phase is denoted as S respectivelyA1、SB1、SC1；
SA2、SB2、SC2；SA3、SB3、SC3；It is 0 when active switch is connected, is 1 when shutdown.
In three-phase input balance, the output voltage average value of three three-phase VIENNA converters can be obtained in conjunction with assumed condition
It is equal, it is set as UO1=UO2=UO3=UO.Ignore the Neutral-point Potential Fluctuation of three-phase VIENNA converter, it is believed that each direct current output
Voltage on capacitor is equal, is set asConnected again by circuit
Mode is connect, the inputting line voltage of three-phase VIENNA converter exchange side can must be cascaded are as follows:
In the ideal situation, three phase currents of the output of converter shown in Fig. 1 are symmetrical, it is assumed that and its expression formula such as (5) is shown,
Wherein I is its virtual value.
To Fig. 1, can be obtained by the connection relationship between KCL and disparate modules
If using synchronously control to each submodule of cascade three-phase VIENNA converter, and exchange side three-phase current pair
Claim, as shown in Figure 2 its interior circular current ia3、ib1、ic2The sum of fundametal compoment be 0, that is, have
ia3+ib1+ic2=0 (7)
The expression formula such as (8) that three bridge arm currents of each submodule can be obtained by formula (5)-(7) is shown.
According to the working principle of VIENNA converter, the inputting line voltage formula of three-phase VIENNA converter exchange side is cascaded
(4) it can further describe are as follows:
Wherein,For sign function.
By formula (8) it is found that ia1、ib2、ic3；ib1、ic2、ia3；ia2、ib3、ic1Three-phase symmetrical successively differs 120 °, by formula
(9) it is clear to, works as SA1、SB2、SC3；SB1、SC2、SA3；SA2、SB3、SC1When successively differing 120 °, converter can be made to work normally, it is defeated
The line voltage of three-phase symmetrical out.
In order to realize tracking of the alternating current to power phase, the more of unity power factor operation and DC side are realized
Output is stablized on road, which can use three kinds of different control methods to be controlled to reach different control requirements:
The first control method is closed using the double of current phase real-time tracking voltage-phase under three-phase static coordinate system
Ring control, is made of, as shown in Figure 8 a Voltage loop and the every phase current ring of each module i.e. 9 electric current loops.Voltage loop is by reality
Border cascade VIENNA converter DC voltage output andWith DC voltage Setting signalAfter be sent into
Pi regulator exports as DC current signal id, the electric current loop of first module is by idWith corresponding A phase phase voltage, AB phase, CA
The identical sinusoidal signal of phases line voltage phase is multiplied, and obtains the command signal of three alternating currents of A phasing commutatorThe electric current loop of second module is by idWith corresponding AB phases line voltage, B phase phase voltage, BC phases line voltage phase
Identical sinusoidal signal is multiplied, and obtains the command signal of three alternating currents of B phasing commutatorThird mould
The electric current loop of block is by idSinusoidal signal identical with corresponding CA phases line voltage, BC phases line voltage, C phase phase voltage phase is multiplied,
Obtain the command signal of three alternating currents of C phasing commutatorIt is sent into PI tune afterwards compared with actual current signal
Device, output and triangle wave are saved, the driving signal S of 9 active switch is generatedA1、SB1、SC1, SA2、SB2、SC2, SA3、SB3、SC3,
Such control method control effect is best, and real-time is optimal, and three-phase current active power factor correction, three modules may be implemented
Each bridge arm current sine, total harmonic distortion factor THD ≈ 1.5%, but control mode is the most complicated, needs 9 electric current loops.
Second of control method is the optimization of the first control method, as shown in figure 9, Voltage loop control is identical, only needs the
Three electric current loops of one module generate three AC signalsIt is sent into PI tune afterwards compared with actual current signal
Device, output and triangle wave are saved, A1, B1, C1 phase active switch driving signal S are generatedA1、SB1、SC1；By SA1、SB1、SC1Successively
DelayAs B2, C2, A2 phase active switch driving signal SB2、SC2、SA2；Successively it is delayedAs C3,
A3, B3 phase active switch driving signal SC3、SA3、SB3, such control method control effect is good, and control mode is more optimized, reduces
6 electric current loops, and three-phase current active power factor correction also may be implemented, each bridge arm current of three modules is sinusoidal
Change, total harmonic distortion factor THD ≈ 3.1%.
The third control method is as shown in Figure 10, also only needs 3 electric current loops, but not with the electric current loop of first two method
Together, the electric current loop of the third first module of control method is by idSine identical with A phase, B phase, C phase phase voltage phase respectively
Signal multiplication generates three AC signalsPi regulator, output and three are sent into after compared with actual current signal
Angle Bobbi is compared with generation A1, B1, C1 phase active switch driving signal SA1、SB1、SC1；SA1、SB1、SC1It can be used as second and
The active switch driving signal of three modules, SA1=SA2=SA3, SB1=SB2=SB3, SC1=SC2=SC3.Such control mode is most
Simply, 3 electric current loops are only needed, and are not necessarily to time delay process, control effect is good, and three-phase current active power factor school may be implemented
Just, total harmonic distortion factor THD ≈ 4.3%, but the electric current on two bridge arms not being connected with phase voltage of each module can not be real
Existing sineization, i.e., there are circulation in entire converter, cause adverse effect to the stability of converter.
Three kinds of control methods can realize tracking of the alternating current to power phase, realize unity power factor operation,
And the multichannel of DC side stablizes output, can all meet the requirement in Practical Project to current total harmonic distortion THD≤5%, but
It is that control system complexity and real-time and control effect are different, it can be according to control requirement and parameter request in engineer application
It is selected.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those skilled in the art in the invention, it can also do again
Appropriate deduction, equivalents, improvement etc. out, but under the premise of not departing from present invention construction thinking, it should be included in the present invention
Protection scope in.
Claims (3)
1. three-phase line voltage cascades VIENNA converter, which is characterized in that its second level cascaded topology includes:
Star-like connection and three-phase input power supply u without the neutral conductora、ub、uc；
Nine with the concatenated input boost inductance L of every phase bridge arma1、Lb1、Lc1, La2、Lb2、Lc2, La3、Lb3、Lc3, inductance value phase
Together, wherein the output end of three boost inductances connecting with three phase mains, is denoted as A, B, C respectively；
Three completely identical in structure phase three-wire three VIENNA converters, three three-phase bridges correspond to the tie point of two bridge arms of phase or more
It is denoted as A1, B1, C1, A2, B2, C2 and A3, B3, C3 respectively；Each phase three-wire three VIENNA converter is opened by 3 bidirectional powers
Close KA、KB、KC, 6 fast recovery rectifier diode Daf+、Daf-、Dbf+、Dbf-、Dcf+、Dcf-With two groups of direct current output capacitors, a resistance
Load composition；
Six output capacitances of three three-phase VIENNA converters are denoted as C respectivelyaf1、Caf2、Cbf1、Cbf2、Ccf1、Ccf2；Three electricity
Resistance load is denoted as R respectively1、R2、R3；Three groups of DC output voltage are denoted as U respectivelyO1、UO2、UO3；The voltage value of six output capacitances
It is denoted as u respectivelydc1、udc2、udc3、udc4、udc5、udc6；Three three-phase VIENNA converters are the line voltage cascadeds by input side
Together, specific connection type are as follows: A phase inputs inductance La1Output terminals A be connected with A1, B1 pass through boost inductance Lb1、La2With
A2 is connected, and B2 and B phase inputs inductance Lb2Output end B be connected, C2 pass through boost inductance Lc2、Lb3It is connected with B3, C3 and C phase are defeated
Enter inductance Lc3Output end C be connected, A3 pass through boost inductance La3、Lc1It is connected with C1；
Three-phase line voltage cascades VIENNA converter, in order to realize tracking of the alternating current to power phase, realizes unit power
The multichannel of factor operation and DC side stablizes output, and three kinds of different control methods can be used to be controlled to reach not
Same control requirement:
The first control method using current phase real-time tracking voltage-phase under three-phase static coordinate system two close cycles control
System, is made of a Voltage loop and the every phase current ring of each module i.e. 9 electric current loops；Voltage loop is by actual cascade VIENNA
Converter DC voltage output andWith DC voltage Setting signalAfter be sent into pi regulator, export
For DC current signal id, the electric current loop of first module is by idWith corresponding A phase phase voltage, AB phase, CA phases line voltage phase phase
Same sinusoidal signal is multiplied, and obtains the command signal of three alternating currents of A phasing commutatorSecond module
Electric current loop by idSinusoidal signal identical with corresponding AB phases line voltage, B phase phase voltage, BC phases line voltage phase is multiplied, and obtains
To the command signal of three alternating currents of B phasing commutatorThe electric current loop of third module is by idWith corresponding CA
The identical sinusoidal signal of phases line voltage, BC phases line voltage, C phase phase voltage phase is multiplied, and obtains three alternating currents of C phasing commutator
The command signal of streamPi regulator, output and triangle wave are sent into after compared with actual current signal, it is raw
At the driving signal S of 9 active switchA1、SB1、SC1, SA2、SB2、SC2, SA3、SB3、SC3, such control method control effect is most
Good, real-time is optimal, may be implemented three-phase current active power factor correction, each bridge arm current sine of three modules, always
Percent harmonic distortion THD ≈ 1.5%, but control mode is the most complicated, needs 9 electric current loops；
Second of control method is the optimization of the first control method, and Voltage loop control is identical, only needs three of first module
Electric current loop generates three AC signalsPi regulator, output and triangle are sent into after compared with actual current signal
Bobbi is compared with generation A1, B1, C1 phase active switch driving signal SA1、SB1、SC1；By SA1、AB1、SC1Successively it is delayedMake
For B2, C2, A2 phase active switch driving signal SB2、SC2、SA2；Successively it is delayedAs C3, A3, B3 phase active switch
Driving signal SC3、SA3、SB3, such control method control effect is good, and control mode is more optimized, reduce 6 electric current loops, and
And three-phase current active power factor correction also may be implemented, and each bridge arm current sine of three modules, total harmonic distortion factor
THD ≈ 3.1%；
The third control method also only needs 3 electric current loops, but different from the electric current loop of first two method, the third controlling party
The electric current loop of first module of method is by idSinusoidal signal identical with A phase, B phase, C phase phase voltage phase, which is multiplied, respectively generates three
AC signalBe sent into pi regulator after compared with actual current signal, output and triangle wave, generate A1,
B1, C1 phase active switch driving signal SA1、SB1、SC1；SA1、SB1、SC1It can be used as second and the active of third module open
Close driving signal, SA1=SA2=SA3, SB1=SB2=SB3, SC1=SC2=SC3, such control mode is most simple, only needs 3 electric currents
Ring, and it is not necessarily to time delay process, control effect is good, and three-phase current active power factor correction, total harmonic distortion factor may be implemented
THD ≈ 4.3%, but the electric current on two bridge arms not being connected with phase voltage of each module cannot achieve sinusoidalization, i.e., entirely
There are circulation in converter, cause adverse effect to the stability of converter.
2. three-phase line voltage cascades VIENNA converter according to claim 1, which is characterized in that the subelement of the converter
It is completely identical in structure phase three-wire three VIENNA converter；List may be implemented for wholly-controled device IGBT in the switching tube used
Position power factor.
3. three-phase line voltage cascades VIENNA converter according to claim 1, which is characterized in that cascade for n grades three
Phase bridging parallel operation is made of (3n-3) a three-phase VIENNA converter module, needs (9n-9) a active switch and (6n-6) altogether
A direct current output capacitor (n is the positive integer greater than 1)；Connection relationship between disparate modules bridge arm are as follows: A phase inputs inductance La1It is defeated
Outlet A is connected with A1, and B phase inputs inductance LbnOutput end B and bridge arm BnIt is connected, C phase inputs inductance Lc(2n-1)Output end C with
C2n-1It is connected；BiPass through boost inductance and Ai+1It is connected (1≤i≤n), CjPass through boost inductance and Bj+1It is connected (n≤j≤2n-1),
AkPass through boost inductance and ck+1It is connected (2n-1≤k≤3n-3), wherein the bridge arm being not directed to passes through inductance in a certain way
It is attached；Wherein remember that the tie point of every phase upper and lower bridge arm of each three-phase bridge is denoted as A respectivelyi、Bi、Ci(i=1,2 ... ... 3n-
3)。
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| CN109713917A (en) * | 2017-10-25 | 2019-05-03 | 中兴通讯股份有限公司 | Fairing and rectification control method |
| CN107888095A (en) * | 2017-12-18 | 2018-04-06 | 中国矿业大学(北京) | High-power Mixed cascading electronic power convertor based on Vienna rectification module |
| CN108233502A (en) * | 2018-03-29 | 2018-06-29 | 中国矿业大学(北京) | A kind of three-phase electricity charging circuit configuration |
| CN108711871A (en) * | 2018-07-28 | 2018-10-26 | 中国矿业大学(北京) | Advanced Static Var Compensator based on VIENNA rectifier |
| CN110048623B (en) * | 2019-05-28 | 2023-08-18 | 中国矿业大学(北京) | Line voltage cascade three-phase diode high-power factor converter and control strategy thereof |
| CN112600447B (en) * | 2020-11-25 | 2023-02-28 | 深圳市科华恒盛科技有限公司 | Application method of rectification module |
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| US20080013352A1 (en) * | 2006-07-13 | 2008-01-17 | Baker Donal E | Active rectifier system with power factor correction |
| CN102223099A (en) * | 2011-06-15 | 2011-10-19 | 重庆大学 | Adaptive three-phase balanced control cascaded three-phase bridge converter |
| CN104836466A (en) * | 2015-05-28 | 2015-08-12 | 哈尔滨理工大学 | 60-degree coordinate system-based three-phase VIENNA rectifier and control method |
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| US20080013352A1 (en) * | 2006-07-13 | 2008-01-17 | Baker Donal E | Active rectifier system with power factor correction |
| CN102223099A (en) * | 2011-06-15 | 2011-10-19 | 重庆大学 | Adaptive three-phase balanced control cascaded three-phase bridge converter |
| CN104836466A (en) * | 2015-05-28 | 2015-08-12 | 哈尔滨理工大学 | 60-degree coordinate system-based three-phase VIENNA rectifier and control method |
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