CN107888090A - A kind of mixing three-phase rectifier of non-three-phase bridge arm symmetrical structure - Google Patents
A kind of mixing three-phase rectifier of non-three-phase bridge arm symmetrical structure Download PDFInfo
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- CN107888090A CN107888090A CN201711405554.XA CN201711405554A CN107888090A CN 107888090 A CN107888090 A CN 107888090A CN 201711405554 A CN201711405554 A CN 201711405554A CN 107888090 A CN107888090 A CN 107888090A
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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
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
A kind of mixing three-phase rectifier of non-three-phase bridge arm symmetrical structure, including the first rectification circuit, the second rectification circuit and control circuit, first rectification circuit and the second rectification circuit are in parallel；The control circuit includes the first sample circuit, the first drive circuit, the second sample circuit, the second drive circuit, zero passage signal detection circuit and DSP Processor；The output end of first drive circuit connects with the control terminal of the first rectification circuit；The output end of second drive circuit connects with the control terminal of the second rectification circuit；The first sample circuit output end, the second sample circuit output end, zero passage signal detection circuit output end connect with DSP Processor input respectively.The present invention not only reduces switching tube stress, reduces production cost, and control method is easy to Digital Implementation, can effectively suppress AC harmonic wave, improves operating efficiency, realizes power output distribution and net side unity power factor operation.
Description
Technical field
The present invention relates to three-phase rectifier field, and in particular to a kind of mixing three phase rectifier of non-three-phase bridge arm symmetrical structure
Device.
Background technology
With the fast development of Power Electronic Technique, power electronic equipment is widely used in all fields of national economy.So
And power electronic equipment is a large amount of using the problem of some are very important is also brought, many converter plants need rectification at present
Link obtains DC level, and not only DC voltage is of low quality for traditional phase control rectifier and diode rectification, and can be right
Power network injects a large amount of harmonic waves, causes power network " pollution ".In general, suppressing the approach of harmonic pollution in electric power net has two kinds：One kind is
Compensation device, such as active, passive filter are set, but its compensation characteristic is easily by operation of power networks state and impedance operator
Influence；Another kind is that converter plant itself is transformed, and by PWM, (Pulse Width Modulation pulse widths are adjusted
System) technology is incorporated into rectifier, and system dynamic responding speed is improved, realizes current on line side sineization and unity power factor.
Recently as the development of commutation technique, three-phase tri-level rectifier can make the small power of pressure-resistant low operating current
Switching device is applied in high-power occasion, and than two level more significantly reduce current harmonics and in the industrial production
It is used widely, but how further improves the operating efficiency of three-phase tri-level rectifier, suppress mains by harmonics, improve work(
The combination property such as rate factor and reduction production cost turns into a great problem.
The content of the invention
The purpose of patent of the present invention is to propose a kind of mixing three-phase rectifier of non-three-phase bridge arm symmetrical structure, to enter one
Step suppresses mains by harmonics, improves power factor and operating efficiency, reduces the usage quantity of full-controlled device, and reduction production cost is simultaneously real
Existing power distribution and current on line side sineization.
The technical scheme is that a kind of mixing three-phase rectifier of non-three-phase bridge arm symmetrical structure, a kind of non-three-phase bridge
The mixing three-phase rectifier of arm symmetrical structure, first rectification circuit and the second rectification circuit output end are in parallel；The control
Circuit includes the first sample circuit, the first drive circuit, the second sample circuit, the second drive circuit, zero passage signal detection circuit
And DSP Processor；The output end of first drive circuit connects with the control terminal of the first rectification circuit；The second driving electricity
The output end on road connects with the control terminal of the second rectification circuit；The first sample circuit output end, the output of the second sample circuit
End, zero passage signal detection circuit output end connect with DSP Processor input respectively.
Further, first rectification circuit includes three-phase bridge uncontrollable rectifier circuit and DC-DC converter, three-phase bridge
Formula uncontrollable rectifier circuit and DC-DC converter are sequentially connected in series, and the three-phase bridge uncontrollable rectifier circuit is made up of 6 diodes
3 bridge arms are formed；The midpoint of 3 bridge arms is as three-phase alternating current input.
Further, the DC-DC converter is Boost type booster circuit.
Further, second rectification circuit is diode clamp SVPWM rectification circuits, including the first bridge arm, second
Bridge arm, DC bus capacitor C1、C2, first bridge arm is identical with the circuit structure of the second bridge arm, and S is switched by the first conducting1、
Second conducting switch S2, the 3rd conducting switch S3, the 4th conducting switch S4, the first clamp switch D1With the second clamp switch D2Structure
Into；The first conducting switch S1Negative pole simultaneously with second conducting switch S2Positive pole and the first clamp switch D1Negative electrode phase
Even, the second conducting switch S2Negative pole and the 3rd conducting switch S3Positive pole connection, the 3rd conducting switch S3Negative pole simultaneously with the
Four conducting switch S4Positive pole and the second clamp switch D2Anode connection, the first clamp switch D1Anode with second clamp open
Close D2Negative electrode connection；DC bus capacitor C1、C2, electric capacity C in parallel with the first bridge arm and the second bridge arm after being sequentially connected in series1、C2In
Point is used as neutral point n；The midpoint of the clamp switch of first bridge arm and the second bridge arm is connected respectively to neutral point n；First bridge arm
Midpoint, the midpoint of the second bridge arm, neutral point n are used as three-phase alternating current input after being concatenated reactor respectively.
Preferably, the conducting switch is made up of IGBT anti-paralleled diodes.
Preferably, the clamp switch is diode.
Further, first sample circuit and the second sample circuit include Hall voltage current sensor.
Further, the DSP Processor model TMS320F2812.
The control method of the mixing three phase rectifier of described non-three-phase bridge arm symmetrical structure, is comprised the following steps that：
Step 1：Sample DC voltage Udc, output total current Idc, the first rectification circuit electric current Idc2, using adaptive work(
Rate allocation algorithm determines current division ratio α；
Step 2：Sampling three-phase bridge-type uncontrollable rectifier circuit output current Iindc2, calculate DC voltage UdcWith reference electricity
Press UdrefError, this error signal passes through the 3rd PI controllers, and the output valve of the 3rd PI controllers is multiplied by k (1- α), as a result made
For the current reference value of the first rectification circuit current inner loop, this current reference value and sample rate current Iindc2Compare, difference is passed through
4th PI controllers, generation SPWM signals are exported according to the 4th PI controllers, the Boost type as the first rectification circuit is boosted electric
The drive signal of way switch pipe；
Step 3：By DC side electric current IdcIt is multiplied by current division ratio α, and DC voltage reference value Udref, DC side electricity
Press UdcAs the input of sliding mode controller, the output of sliding mode controller is as active power reference α Pref；
Step 4：Sample active-power P2, reactive power Q2With alternating voltage phase θ, active power reference α P are calculatedref
With active-power P2Error, this error signal obtains reference voltage vector u through the 2nd PI controllersrd；
Step 5：Make reactive power reference Qref=0, calculate reactive power Q2With reactive power reference QrefError,
This error signal obtains reference voltage vector u through the first PI controllersrq；
Step 6：By reference voltage vector urd、urqCarry out despining of the two-phase rotating coordinate system to two-phase rest frame
Coordinate transform, obtain urα、urβ, SVPWM modulation is thus carried out, the pwm signal of generation is as the bridge arm tri-level rectified current of three-phase two
The drive signal of way switch pipe.
Further, in above-mentioned steps 1, adaptive tracking control algorithm is specially:It is whole by sampling circuit samples first
Current circuit and the second rectification circuit DC side output voltage current signal, obtain its power output, when loading condition changes
When, the ratio between two rectification circuit power outputs can also change therewith.By the reference value I for changing electric currentdrefTo realize output
Side power distribution, and ensure that net side unity power factor is run.Then the distribution coefficient of current reference value is：
Wherein, PO1For the second rectification circuit power output, PO2For the first rectification circuit power output.
The current inner loop of first rectification circuit is k (1- α) I with reference to set-pointdc；Second rectification circuit gives current reference value
For α Idc。
Further, in above-mentioned steps 3, sliding mode controller is designed specifically to：Power outer shroud is by instantaneous active work(
Rate and instantaneous reactive equilibrium equation describe the dynamic process of DC voltage, choose using active power and reactive power as variable
Sliding-mode surface：
Mixed-rectification device is operated under unity power factor state, reactive power zero, then：
Qref=Q=0 (3)
For active power sliding-mode surface, in any one switch periods, disregard circuit equivalent impedance loss and switch damages
Consumption, AC input power and DC side power are equal, then have：
P in formulaacFor AC input power, PdcFor DC side power, CUdcdUdc/ 2dt is DC side two electric capacity up and down
Instantaneous power,For load instantaneous power, can be obtained after arrangement：
Simultaneous formula (2) and (4), because the direct controlled quentity controlled variable of power outer shroud is Udc, then sliding-mode surface S2It can be changed to：
K is control coefrficient and is not zero in formula；In one switch periods, relative power inner ring, the reference quantity of DC voltage
UdrefDefinite value is defaulted as, thenFormula (5) is substituted into (6) and obtained：
Because formula (7) meets sliding-mode surface S2=Pref- P=0, obtain
The output of sliding mode controller：
The technical program uses adaptive tracking control algorithm, realizes between the first rectification circuit and the second rectification circuit
Power equalization distributes；The PI controllers containing power partition coefficient and correction factor are used for the first rectification circuit, for
Two rectification circuits use PI sliding formwork Compound Control Strategies, and the outer shroud of the Compound Control Strategy uses power Sliding mode variable structure control,
Inner ring uses PI controllers.
The present invention operation principle be：First sample circuit and the second sample circuit collection DC side output end and AC
Input terminal voltage current signal, dsp controller is passed to after A/D is changed, analysis fortune is carried out to sampled signal by dsp controller
Calculate, and then carry out the SVPWM modulation of three level, then the first rectification circuit and the second rectification circuit three are controlled by drive circuit
The switching device of the bridge arm tri-level rectifier of phase two being opened and turning off；Zero passage signal detection circuit detects sinusoidal voltage zero passage
Point, rising edge is caught by dsp controller, realizes the lock phase of mains frequency, is calculated for control signal and phase angle is provided.
The beneficial effects of the invention are as follows：Compared to the level voltage type PWM rectifier of conventional three-phase three, not only reduce switching tube
Stress, production cost is reduced, and control method is easy to Digital Implementation, can effectively suppress AC harmonic wave, improves work
Make efficiency, realize power output distribution and net side unity power factor operation.
Brief description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is circuit structure block diagram of the present invention.
Fig. 2 is circuit diagram of the present invention.
Fig. 3 is the control circuit schematic diagram of the present invention.
Fig. 4 is the equivalent circuit diagram of the second rectification circuit.
Fig. 5 is the equivalent circuit diagram of the second rectification circuit mode of operation 1.
Fig. 6 is the equivalent circuit diagram of the second rectification circuit mode of operation 2.
Fig. 7 is the equivalent circuit diagram of the second rectification circuit mode of operation 3.
Fig. 8 is the equivalent circuit diagram of the second rectification circuit mode of operation 4.
Fig. 9 is the equivalent circuit diagram of the second rectification circuit mode of operation 5.
Figure 10 is the equivalent circuit diagram of the second rectification circuit mode of operation 6.
Figure 11 is the equivalent circuit diagram of the second rectification circuit mode of operation 7.
Figure 12 is the equivalent circuit diagram of the second rectification circuit mode of operation 8.
Figure 13 is the equivalent circuit diagram of the second rectification circuit mode of operation 9.
Figure 14 is the first rectification circuit input side current waveform.
Figure 15 is the second rectification circuit input side current waveform.
Figure 16 is the electric current and voltage waveform of input side of the present invention.
Figure 17 is outlet side voltage waveform of the present invention.
Embodiment
With reference to the accompanying drawings and detailed description, the present invention is described in more detail.
As shown in figure 1, a kind of mixing three-phase rectifier of non-three-phase bridge arm symmetrical structure, first rectification circuit and
Two rectification circuit output ends are in parallel；The control circuit include the first sample circuit, the first drive circuit, the second sample circuit,
Second drive circuit, zero passage signal detection circuit and DSP Processor；The output end and the first rectified current of first drive circuit
The control terminal connection on road；The output end of second drive circuit connects with the control terminal of the second rectification circuit；Described first adopts
Sample circuit output end, the second sample circuit output end, zero passage signal detection circuit output end connect with DSP Processor input respectively
Connect.
First rectification circuit includes three-phase bridge uncontrollable rectifier circuit and DC-DC converter, and three-phase bridge is not controlled whole
Current circuit and DC-DC converter are sequentially connected in series, 3 bridge arms that the three-phase bridge uncontrollable rectifier circuit is made up of 6 diodes
Form；The midpoint of 3 bridge arms is used as three-phase alternating current input after being concatenated reactor.The DC-DC converter is Boost
Type booster circuit.
As shown in Fig. 2 Va(t)、Vb(t)、Vc(t) it is three-phase symmetrical phase voltage, ia1、ib1、ic1For the second rectification circuit
Net side input three-phase current, ia2、ib2、ic2For the net side input three-phase current of the first rectification circuit；L1、L2、L3For second
The net side filter inductance (three-phase filter inductance is equal in magnitude) of rectification circuit, R1、R2、R3For equivalent resistance, L4、L5、L6For first
The net side filter inductance of rectification circuit (three-phase filter inductance is equal in magnitude)；LdBecome for Boost type DC-DC in the first rectification circuit
The boost inductance of parallel operation；S1、S2、S6、S7For upper bridge arm IGBT (the Insulated Gate Bipolar of the second rectification circuit
The compound full-control type voltage driven type power semiconductor switch pipes of Transistor), S3、S4、S8、S9For under the second rectification circuit
Bridge arm IGBT, S5For the switching tube of DC-DC converter；C1、C2For DC bus capacitor, RLFor resistive load；UdcExported for DC side
Voltage, IdcTotal current, I are exported for DC sided1For the second rectification circuit DC side output current, Idc2It is straight for the first rectification circuit
Flow side output current.
The three-phase diode bridge of first rectification circuit is made up of six diodes, its input and three-phase alternating-current supply Va
(t)、Vb(t)、Vc(t) connected with phase incoming end, output end is sequentially connected in series boost inductance Ld, paralleling switch pipe S5, series diode
D5, then the electric capacity C with connecting1、C2, ohmic load RLCompose in parallel loop, diode D5Ensure energy in the first rectification circuit
One-way flow.Two bridge arms of the second rectification circuit are made up of IGBT and diode, and input a phases are through reactor L1With in a bridge arms
Point is connected, and input b phases are through reactor L2It is connected with b bridge arms midpoint, input c phases are through reactor L3It is joined directly together with neutral point n.Often
The upper bridge arm of individual bridge arm, lower bridge arm are made up of the IGBT of 2 series connection respectively, the diodes of 2 series connection be connected to bridge arm midpoint,
(diode cathode of series connection is connected with upper bridge arm midpoint), each IGBT anti-paralleled diodes, Mei Geqiao between lower bridge arm midpoint
The midpoint of the series diode of arm is connected with neutral point n；The upper and lower node of each bridge arm output capacitance with connecting respectively
C1、C2With ohmic load RLIt is connected in parallel.Inductor is mainly used in filtering out the current harmonics of net side, DC bus capacitor C1、C2
As energy-storage travelling wave tube, there is provided a stable voltage output；First rectification circuit and the second rectification circuit work in different topology
Structure and working frequency, it is same load supplying altogether that the two is parallel with one another, and the first rectification circuit, the input of the second rectification circuit are electric
Stream synthesizes the sinusoidal current synchronous with voltage on line side.
, wherein it is desired to what is further illustrated is topological structure, its equivalent electric used by the second rectification circuit in the present invention
Road is as shown in figure 4, wherein Sa=1 represents S1And S2Conducting；Sa=0 represents S2And S3Conducting；Sa=-1 represents S3And S4Conducting.Sb
=1 represents S6And S7Conducting；Sb=0 represents S7And S8Conducting；Sb=-1 represents S8And S9Conducting.Assuming that neutral point n is dynamic electric voltage
Poised state, and UC1=UC2=Udc/ 2, then Van、VbnThere are 3 kinds of level-U respectivelydc/2、0、Udc/ 2, VabHave 5 kinds of level-
Udc、-Udc/2、0、Udc/2、Udc, the pressure voltage of each switching tube is Udc/ 2, so as to efficiently reduce the voltage stress of switching tube,
Reduce production cost.As can be seen that the bridge arm tri-level rectifier of three-phase two shares 9 kinds of mode of operations from equivalent circuit, have
Body is as shown in figures 5-13：
1) (the S of mode of operation 1a=0, Sb=0；S2、S3、S7、S8Conducting)：Van=Vbn=Vab=0, equivalent circuit diagram such as Fig. 5
It is shown.
2) (the S of mode of operation 2a=1, Sb=0；S1、S2、S7、S8Conducting)：Van=Vab=Udc/2,Vbn=0；
Electric current iaReduce, work as VbcDuring ＞ 0, ibIncrease, works as VbcDuring ＜ 0, ibReduce, equivalent circuit diagram is as shown in Figure 6.
3) (the S of mode of operation 3a=1, Sb=1；S1、S2、S6、S7Conducting)：Van=Vbn=Udc/2,Vab=0；Electric current ia、ib
Reduce, icIncrease, equivalent circuit diagram are as shown in Figure 7.
4) (the S of mode of operation 4a=0, Sb=1；S2、S3、S6、S7Conducting)：Van=0, Vbn=Udc/2,Vab=-Udc/2；When
VacDuring ＞ 0, electric current iaIncrease, works as VacDuring ＜ 0, iaReduce；Electric current ibReduce, equivalent circuit diagram is as shown in Figure 8.
5) (the S of mode of operation 5a=-1, Sb=1；S3、S4、S6、S7Conducting)：Van=-Udc/2,Vbn=Udc/2,Vab=-Udc,
Electric current iaIncrease, ibReduce, equivalent circuit diagram is as shown in Figure 9.
6) (the S of mode of operation 6a=-1, Sb=0；S3、S4、S7、S8Conducting)：Van=-Udc/2,Vbn=0, Vab=-Udc/ 2,
Electric current iaIncrease, works as VbcDuring ＞ 0, ibIncrease, works as VbcDuring ＜ 0, ibReduce, equivalent circuit diagram is as shown in Figure 10.
7) (the S of mode of operation 7a=-1, Sb=-1；S3、S4、S8、S9Conducting)：Van=-Udc/2,Vbn=-Udc/2,Vab=0,
Electric current ia、ibIncrease, icReduce, equivalent circuit diagram is as shown in figure 11.
8) (the S of mode of operation 8a=0, Sb=-1；S2、S3、S8、S9Conducting)：Van=0, Vbn=-Udc/2,Vab=Udc/ 2, when
VacDuring ＞ 0, iaIncrease, works as VacDuring ＜ 0, iaReduce, electric current ibIncrease, equivalent circuit diagram are as shown in figure 12.
9) (the S of mode of operation 9a=1, Sb=-1；S1、S2、S8、S9Conducting)：Van=Udc/2,Vbn=-Udc/2,Vab=Udc,
Electric current iaReduce, ibIncrease, equivalent circuit diagram are as shown in figure 13.
The present invention control circuit by sample circuit, dsp controller, zero passage signal detection circuit, auxiliary power module and
Drive Protecting Circuit etc. forms；The power distribution need to only realize that the distribution to DC side electric current can reach to power output
Distribution, control circuit use adaptive tracking control algorithm, realize the DC side electric current distribution between two rectifiers, α is electric current
Distribution coefficient；The PI sliding formworks Compound Control Strategy, the output of outer sliding mode controller are the reference value of inner ring active power.
PI controllers are used for the first rectification circuit voltage control loop, the input of voltage PI controllers samples for DC side
Voltage Udc, it is U that DC voltage, which gives reference value,dcref, by the reference electricity of the output valve generation current inner loop of voltage PI controllers
Flow valuve, to carry out power distribution to the rectification module, introducing divides coefficient to be k (1- α), and wherein k is correction factor, and 0 ＜ k≤
1000；It is k (1- α) I so as to obtain the reference value of current inner loopdc, it is I to obtain current sampling data by sample circuitindc2, will
Input of both differences as PI controllers, by the output of PI controllers by associated driver circuitry generation SPWM signals, make
For the drive signal of the Boost type boost circuit switch pipe of the first rectification circuit；Answered for the second rectification circuit using PI sliding formworks
Control strategy is closed, the outer shroud of the Compound Control Strategy uses Sliding Mode Controller, and inner ring uses PI controllers.
Specific control process is as follows：The virtual value of three-phase voltage is 220V/50Hz, Inductor L1=4mH, L2=
2mH, boost inductance Ld=4mH, electric capacity C1=C2=C=2200uF；The switching frequency of first rectification circuit is 10kHz, and second is whole
The switching frequency of current circuit is 12kHz, and output voltage desired value is 650V, considers dynamic performance and steady-state behaviour is entered
Row design, the PI control parameters of the first rectification circuit outer voltage the 3rd are 0 ＜ Kp3≤ 58, Ki3=11, the first rectification circuit inner ring
4th PI control parameters are Kp4=45, Ki4=15；The PI control parameters of second rectification circuit the first are Kp1=40, Ki1=22, second
The PI control parameters of rectification circuit inner ring the 2nd are 0 ＜ Kp2≤ 42, Ki2=18, outer shroud sliding formwork control parameter K=120, controller is adopted
Distribution of its main operational, controlling of sampling, power distribution and drive signal etc. is used as by the use of TMS320F2812 models dsp chip.Such as
Sampling obtains DC side output voltage U shown in Fig. 3dc, output current Idc、Id1、Idc2, calculating current distribution coefficient α=PO1/(PO1
+PO2)=(Idc-Idc2)/Idc, current reference amount k (1- α) I after distributiondcWith current actual value Iindc2Between error pass through
Pi regulator is exported to dsp chip, produces SPWM signals, and the Power Control to the first rectification circuit is realized through drive circuit.It is right
In the second rectification circuit, the electric current α I after distributiondcWith given voltage Udref, output voltage UdcExport, obtain by sliding mode controller
To the reference quantity α P of active powerref.When unity power factor is run, the reference quantity Q of reactive powerref=0；Instantaneous active work(
The actual value P of rate2, instantaneous reactive power actual value Q2And the phase of voltage on line side is sampled to obtain by AC；Active power and
Error between the reference quantity and actual value of reactive power carries out unity power factor control, power inner ring two by PI controllers
The output of individual PI controllers is reference voltage vector urd, urq；Then two-phase rest frame is arrived by two-phase rotating coordinate system
Despining coordinate transform, that is, obtain urα, urβ；Thus the SVPWM modulation of three level is carried out, drive signal is produced, realizes to second
Power Control and the net side unity power factor control of rectification circuit.
Figure 14 show the first rectification circuit input side stabling current waveform, joins according to listed control in specific implementation process
Number carries out simulating, verifying, can be seen that from waveform, and now the first rectification circuit output current wave has distortion, working condition class
It is similar to active filter working condition；Figure 15 is the second rectification circuit input side current waveform, by by Figure 14 and Figure 15 waveforms
Comparison can find that it is connecing for present apparatus input side that Figure 14 and Figure 15 current waveform, which is superimposed as Figure 16 waveforms, Figure 16,
Enter power network current waveform, it can be seen that total current sine degree is preferable, and total current and voltage in phase, meet rectification
Device output requires, when actual circuit designs due to the number of reduction electric capacity, can significantly reduce mixed-rectification body product.
Figure 17 is the DC voltage output waveform of the present apparatus, and mixed-rectification device can be stablized and export directly as can be seen from Figure
Voltage is flowed, is stabilized to 650V, is about a power frequency period from initial time arrival stabilization time.
DSP Processor carries out power equalization distribution by control circuit to the first rectification circuit and the second rectification circuit.Have
Effect ground suppresses harmonic wave, realizes the stable output and net side unity power factor control of voltage.Using the present invention, cascaded by three-phase
Electric capacity can be reduced by not controlling three level rectifying parallel connections of boost rectifier and non-three-phase bridge arm symmetrical structure, improve the work(of converter
Rate density, so as to increase substantially the operating efficiency of rectifier；Mixing three-level rectifier proposed by the invention uses entirely
It is only 9 to control device, compared with traditional three-level rectifier bridge circuit, reduces the usage quantity of full-controlled device, saves into
This.
Claims (10)
1. a kind of mixing three-phase rectifier of non-three-phase bridge arm symmetrical structure, including the first rectification circuit, the second rectification circuit and
Control circuit, it is characterised in that：First rectification circuit and the second rectification circuit output end are in parallel；The control circuit includes
First sample circuit, the first drive circuit, the second sample circuit, the second drive circuit, zero passage signal detection circuit and DSP processing
Device；The output end of first drive circuit connects with the control terminal of the first rectification circuit；The output of second drive circuit
End connects with the control terminal of the second rectification circuit；The first sample circuit output end, the second sample circuit output end, zero passage letter
Number detection circuit output end connected respectively with DSP Processor input.
2. the mixing three-phase rectifier of non-three-phase bridge arm symmetrical structure according to claim 1, it is characterised in that：Described
One rectification circuit includes three-phase bridge uncontrollable rectifier circuit and DC-DC converter, and three-phase bridge uncontrollable rectifier circuit and DC-DC become
Parallel operation is sequentially connected in series, and 3 bridge arms that the three-phase bridge uncontrollable rectifier circuit is made up of 6 diodes are formed；3 bridge arms
Midpoint be concatenated reactor after be used as three-phase alternating current input.
3. the mixing three-phase rectifier of non-three-phase bridge arm symmetrical structure according to claim 2, it is characterised in that：It is described
DC-DC converter is Boost type booster circuit.
4. the mixing three-phase rectifier of non-three-phase bridge arm symmetrical structure according to claim 1, it is characterised in that：Described
Two rectification circuits are diode clamp SVPWM rectification circuits, including the first bridge arm, the second bridge arm, DC bus capacitor C1、C2, it is described
First bridge arm is identical with the circuit structure of the second bridge arm, and S is switched by the first conducting1, second conducting switch S2, the 3rd conducting open
Close S3, the 4th conducting switch S4, the first clamp switch D1With the second clamp switch D2Form；The first conducting switch S1Negative pole
Simultaneously S is switched with the second conducting2Positive pole and the first clamp switch D1Negative electrode be connected, second conducting switch S2Negative pole and
Three conducting switch S3Positive pole connection, the 3rd conducting switch S3Negative pole simultaneously with the 4th conducting switch S4Positive pole and the second pincers
Bit switch D2Anode connection, the first clamp switch D1Anode and the second clamp switch D2Negative electrode connection；DC bus capacitor
C1、C2, electric capacity C in parallel with the first bridge arm and the second bridge arm after being sequentially connected in series1、C2Midpoint as neutral point n；First bridge arm and
The midpoint of the clamp switch of second bridge arm is connected respectively to neutral point n；The midpoint of first bridge arm, the midpoint of the second bridge arm, neutrality
Point n is used as three-phase alternating current input after being concatenated reactor respectively.
5. the mixing three-phase rectifier of non-three-phase bridge arm symmetrical structure according to claim 4, it is characterised in that：It is described to lead
Pass is opened up to be made up of IGBT anti-paralleled diodes.
6. the mixing three-phase rectifier of non-three-phase bridge arm symmetrical structure according to claim 4, it is characterised in that：The pincers
Bit switch is diode.
7. the mixing three-phase rectifier of non-three-phase bridge arm symmetrical structure according to claim 1, it is characterised in that：Described
One sample circuit and the second sample circuit include Hall voltage current sensor.
8. using the rectification control method of any one mixing three-phase rectifier as described in claim 1-7, it is characterised in that bag
Include following steps：
Step 1：Sample DC voltage Udc, output total current Idc, the first rectification circuit electric current Idc2, using adaptive power point
Current division ratio α is determined with algorithm；
Step 2：Sampling three-phase bridge-type uncontrollable rectifier circuit output current Iindc2, calculate DC voltage UdcWith reference voltage Udref
Error, this error signal passes through the 3rd PI controllers, and the output valve of the 3rd PI controllers is multiplied by k (1- α), as a result as first
The current reference value of rectification circuit current inner loop, this current reference value and sample rate current Iindc2Compare, difference passes through the 4th PI
Controller, SPWM signals, the Boost type booster circuit as the first rectification circuit are generated according to the 4th PI controllers output result
The drive signal of switching tube；
Step 3：By DC side electric current IdcIt is multiplied by current division ratio α, and DC voltage reference value Udref, DC voltage Udc
As the input of sliding mode controller, the output of sliding mode controller is as active power reference α Pref；
Step 4：Sample active-power P2, reactive power Q2With alternating voltage phase θ, active power reference α P are calculatedrefWith having
Work(power P2Error, this error signal obtains reference voltage vector u through the 2nd PI controllersrd；
Step 5：Make reactive power reference Qref=0, calculate reactive power Q2With reactive power reference QrefError, this mistake
Difference signal obtains reference voltage vector u through the first PI controllersrq；
Step 6：By reference voltage vector urd、urqThe despining coordinate for carrying out two-phase rotating coordinate system to two-phase rest frame becomes
Change, obtain urα、urβ, SVPWM modulation is thus carried out, the pwm signal of generation switchs as the bridge arm tri-level rectification circuit of three-phase two
The drive signal of pipe.
9. rectification control method according to claim 8, it is characterised in that in step 1, adaptive tracking control algorithm according to
The rectification circuit of sampling circuit samples first and the second rectification circuit DC side output voltage, current signal, obtain its output
Power, when loading condition changes, the ratio between two rectification circuit power outputs can also change therewith；By changing electric current
Reference value IdrefTo realize outlet side power distribution, and net side power factor is controlled, the distribution coefficient of current reference value is：
Wherein, PO1For the second rectification circuit power output, PO2For the first rectification circuit power output；
It is k (1- α) I that the current inner loop of first rectification circuit, which gives reference value,dc；Second rectification circuit given value of current reference value is α
Idc。
10. rectification control method according to claim 8, it is characterised in that in step 3, sliding mode controller, which follows, instantaneously to be had
Work(power and instantaneous reactive equilibrium equation, choose the sliding-mode surface using active power and reactive power as variable：
For active power sliding-mode surface, in any one switch periods, circuit equivalent impedance loss and switching loss are disregarded, hand over
Flow side input power and DC side power is equal, then have：
P in formulaacFor AC input power, PdcFor DC side power, CUdcdUdc/ 2dt is the wink of two electric capacity above and below DC side
When power,For load instantaneous power, can be obtained after arrangement：
Simultaneous formula (2) and (3), sliding-mode surface S2It is changed into：
K is control coefrficient and is not zero in formula；In one switch periods, the reference quantity U of DC voltagedrefFor definite value, thenFormula (4) is substituted into (5) and obtained：
Because formula (6) meets sliding-mode surface S2=Pref- P=0, obtain
The output of sliding mode controller：
。
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| CN109921663A (en) * | 2019-04-01 | 2019-06-21 | 三峡大学 | A kind of two bridge arm tri-level rectifier of three-phase based on soft switch technique |
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