CN107888096A - A kind of bridge arm tri-level mixed-rectification device of three-phase two - Google Patents

A kind of bridge arm tri-level mixed-rectification device of three-phase two Download PDF

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Publication number
CN107888096A
CN107888096A CN201711420890.1A CN201711420890A CN107888096A CN 107888096 A CN107888096 A CN 107888096A CN 201711420890 A CN201711420890 A CN 201711420890A CN 107888096 A CN107888096 A CN 107888096A
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switching tube
rectifier
electric capacity
phase
voltage
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CN107888096B (en
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马辉
危伟
赵金刚
冯茂
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China Three Gorges University CTGU
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China Three Gorges University CTGU
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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
    • 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
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • 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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4216—Arrangements for improving power factor of AC input operating from a three-phase input voltage
    • 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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
    • 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
    • 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
    • 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
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

Abstract

A kind of bridge arm tri-level mixed-rectification device of three-phase two, including two rectifier Z1、Z2, voltage sampling circuit, current sampling circuit, protection circuit, zero cross detection circuit, DSP control module, PWM drive circuit.Wherein rectifier Z1Including the asymmetric three level rectifyings bridge and wave filter being made up of 8 IGBT switching tubes, about two electric capacity, rectifier Z2For a conventional three-phase boost pfc circuit.Using said structure, utilize double circle controling mode, outer voltage is controlled using PI, Passive Shape Control and constant frequency PWM control is respectively adopted in current inner loop, there is the harmonic wave of suppression injection power network, realize ac-side current sineization and unity power factor, improve current tracking ability, system control stabilization, reach the purpose of quickly tracking DC voltage set-point.The present invention is applied to the high requests such as the new energy development such as high voltage DC power transmission converter station, wind energy, solar energy, charging pile for electric vehicle, high efficiency application scenario.

Description

A kind of bridge arm tri-level mixed-rectification device of three-phase two
Technical field
The present invention relates to field of conversion of electrical energy, specifically a kind of bridge arm tri-level mixed-rectification device of three-phase two.
Background technology
With developing rapidly for Power Electronic Technique, power electronic equipment increasingly increases in daily life and work production It is more, it is the electric railway equipment such as the applied power supply of various high-quality, electrically-driven car, frequency conversion speed-adjusting system, all kinds of new Energy generating etc., these equipment are all to be accessed by converters in power network, and the performance of converters is direct Affect the quality of power supply of accessed power network and working environment.Multilevel technology is as improvement systematic function and improves system The important technology of operating efficiency, obtained in high-power fields such as new energy grid-connected inverters, distributed DC generating, transmission systems More and more favors from academia and industrial quarters.Due to the high pressure resistant of power electronic equipment, high frequency, high voltage, great Rong The demand of the characteristics such as amount is increasingly strong, and traditional two level converters are difficult to what is broken through in large-power occasions utilization there is many Bottleneck.Harmonic source in power network is mainly derived from all kinds of converter plants, to the voltage x current and output performance of all kinds of converter plants Control become particularly important, improve converter plant service behaviour turn into administer harmonic pollution in electric power net an importance and Study hotspot.
Multilevel technology is that solve a kind of insufficient ideal scheme of two level converters, multilevel skill Art has stronger advantage in significant power demand occasion, and it connects gate-controlled switch device according to designed circuit topological structure Make to contain more level numbers in output voltage waveforms, therefore the power switch pipe of multi-level converter and diode are born Voltage stress it is low, while harmonic content in electric current is low and voltage in the advantage such as ripple content is few.From application scenario and certainly From the aspects of the complexity two that body function is realized, three-level converter is the most prominent in multilevel converter, and turns into academia One of study hotspot.
The content of the invention
The technical problems to be solved by the invention are：How hybrid rectifier solution conventional three-phase voltage type PWM is utilized The technical barriers such as rectifier operating efficiency is low, net side Injection Current harmonic content is high, power factor is low.And provide a kind of three-phase two Bridge arm tri-level mixed-rectification device, suitable for high voltage DC power transmission converter station, the new energy development such as wind energy, solar energy, electric car The high requests such as charging pile, high efficiency application scenario.
The technical scheme that the present invention takes is：
A kind of bridge arm tri-level mixed-rectification device of three-phase two, including rectifier Z1, rectifier Z2, voltage sampling circuit, electric current Sample circuit, zero cross detection circuit, digital control circuit, PWM drive circuit；
The rectifier Z1For the arm Asymmetry PWM rectifier of three-phase tri-level two, it includes 8 IGBT switching tubes：Open Close pipe S1、S′1、S2、S′2、S3、S′3、S4、S′4, upper electric capacity C1, lower electric capacity C2, switching tube S1Source electrode connecting valve pipe S '1Drain electrode, Switching tube S '1Source electrode difference connecting valve pipe S '3Source electrode, lower electric capacity C2The other end, switching tube S1Drain electrode difference connecting valve pipe S2 Source electrode, switching tube S '2Drain electrode, switching tube S '2Source electrode difference connecting valve pipe S '4Source electrode, lower electric capacity C2One end, switching tube S '3Leakage Pole connecting valve pipe S3Source electrode, switching tube S3Drain electrode difference connecting valve pipe S4Source electrode, switching tube S '4Drain electrode, switching tube S2Drain electrode, Switching tube S4Drain electrode is all connected with electric capacity C1One end, upper electric capacity C1The lower electric capacity C of other end connection2One end；
The rectifier Z2For three-phase boost pfc circuits, it includes 6 diodes：D1、D2、D3、D4、D5、D6, filtering Inductance Ld1、Ld2, metal-oxide-semiconductor Sa, diode D01、D02, 6 diodes：D1、D2、D3、D4、D5、D6Three-phase commutation bridge is connected and composed, institute State three-phase commutation bridge connection filter inductance Ld1One end, filter inductance Ld1Other end connection diode D01Anode, the three phase rectifier Bridging meets filter inductance Ld2One end, filter inductance Ld2Other end connection diode D02Negative electrode, metal-oxide-semiconductor SaDrain electrode connection diode D01Anode, metal-oxide-semiconductor SaSource electrode connection diode D02Negative electrode；
The voltage sampling circuit is used for direct current lateral load RLBoth end voltage is sampled, and sampled value is as PI controllers Input signal；Direct current lateral load RLBoth ends connect electric capacity C respectively1One end, lower electric capacity C2The other end；
The current sampling circuit, for gathering two-phase alternating current；
The zero cross detection circuit, for detecting the voltage zero-crossing point of power grid moment, the sampling period is calculated by DSP, carried For the calculating phase angle of every secondary control computing；
The digital control circuit, for rectifier Z1Constant frequency PWM control, rectifier Z2Passive Shape Control, outside voltage The PI controls of ring；
The PWM drive circuit, for driving rectifier Z1, rectifier Z2Switching tube.
The voltage sampling circuit samples to direct current lateral load both end voltage, and sampled value controls as outer voltage Amount, the i.e. input signal of PI controllers.Voltage sampling circuit uses LV28-P voltage sensors, and it can apply to AC electricity Pressure is sampled using and can applied to DC voltage.
In three-phase symmetrical input system, the vector of three-phase equilibrium operating current is zero, uses any biphase current can be with Third phase electric current is obtained, to save the design of cost simplified control loop, the current sampling circuit uses two-phase, electric current Sensor uses the LT58-S7 of LEM companies production, and dc source is ± 15V, and the specified input current of primary side is 50A, primary side and pair The no-load voltage ratio on side is 1000:1.
Corresponding error protection measure must be had by making a complete experimental provision, and the over-pressed or under-voltage of input voltage all can Bring many adverse effects in itself to device, above-mentioned fault-signal detected when the signal of sample collection passes through control chip computing, Controller will send the signal of block trigger pulse, and now rectifier, which just works, does not control state, in the protection circuit using two Route voltage carries out the control signal of overvoltage/undervoltage protection, two-route wire voltage signal is converted into d. c. voltage signal, by suitable Divider resistance protects system safety operation, and when voltage on divider resistance exceedes the protection domain of setting, controller is issued by Locking signal.
The zero cross detection circuit detects the voltage zero-crossing point of power grid moment, and then DSP is calculated the sampling period, there is provided every The calculating phase angle of secondary control computing.
The digital control circuit uses TMS320F2812 control chips, realizes to rectifier Z1Constant frequency PWM control, Rectifier Z2Passive Shape Control and outer voltage PI control etc. control strategy.
The quality of the PWM drive circuit and rectifier systems service behaviour has direct relation, from Beijing Luo Muyuan electricity The drive module of sub- Technology Co., Ltd.：DP101, the driver element possess low-power consumption, strong driving force, and it is big that itself consumes power About 2.5W ,+15V high level and the low level voltage pulse driving 300A/1200V of -8.5V MOSFET or IGBT can be sent Full control switch；Delay between the low and high level of driving pulse is very short, it is believed that is completed in moment.
A kind of bridge arm tri-level mixed-rectification device of three-phase two of the present invention, has the advantages that：
1. rectifier Z1Compared with conventional three-phase three-level PWM rectifier, 6 IGBT switching tubes are only needed to form three level whole Bridge is flowed, reduces the use of switching tube, it is cost-effective.It is controlled using constant frequency PWM control method switch tube state, realizes and hold Easily.
2. outer voltage uses PI controllers, reference current I is calculated*, and according to the working condition pair of two rectifiers It, which is weighted, respectively obtains rectifier Z1、Z2Inner ring given value of current reference value.Constant frequency PWM control is respectively adopted in current inner loop Algorithm and Passive Control Algorithm are to rectifier Z1、Z2Switching tube is controlled, and has obtained good control effect, is not only effectively dropped Low alternating current net side current harmonic content, unity power factor, and current on line side sineization is good, DC voltage is steady It is fixed, there is very strong robustness, efficientibility.
3. the present invention utilizes double circle controling mode, outer voltage is controlled using PI, and passive control is respectively adopted in current inner loop System and constant frequency PWM control, have and suppress the harmonic wave of injection power network, realize ac-side current sineization and unity power factor, carry The advantages that high current ability of tracking, stable system control, reach the purpose of quick tracking DC voltage set-point.
4. the present invention is applied to the new energy development such as high voltage DC power transmission converter station, wind energy, solar energy, charging pile for electric vehicle Deng high request, high efficiency application scenario.
Brief description of the drawings
The invention will be further described with reference to the accompanying drawings and examples：
Fig. 1 is the Basic Topological figure of the bridge arm tri-level mixed-rectification device of three-phase two of the present invention.
Fig. 2 is the circuit topological structure block diagram of the bridge arm tri-level mixed-rectification device of three-phase two of the present invention.
Fig. 3 (1) is the figure of working condition one of the bridge arm tri-level mixed-rectification device of three-phase two of the present invention.
Fig. 3 (2) is the figure of working condition two of the bridge arm tri-level mixed-rectification device of three-phase two of the present invention.
Fig. 3 (3) is the figure of working condition three of the bridge arm tri-level mixed-rectification device of three-phase two of the present invention.
Fig. 3 (4) is the figure of working condition four of the bridge arm tri-level mixed-rectification device of three-phase two of the present invention.
Fig. 3 (5) is the figure of working condition five of the bridge arm tri-level mixed-rectification device of three-phase two of the present invention.
Fig. 3 (6) is the figure of working condition six of the bridge arm tri-level mixed-rectification device of three-phase two of the present invention.
Fig. 3 (7) is the figure of working condition seven of the bridge arm tri-level mixed-rectification device of three-phase two of the present invention.
Fig. 3 (8) is the figure of working condition eight of the bridge arm tri-level mixed-rectification device of three-phase two of the present invention.
Fig. 3 (9) is the figure of working condition nine of the bridge arm tri-level mixed-rectification device of three-phase two of the present invention.
Fig. 4 (a) is the other topology diagram one of the bridge arm tri-level mixed-rectification device of three-phase two of the present invention.
Fig. 4 (b) is the other topology diagram two of the bridge arm tri-level mixed-rectification device of three-phase two of the present invention.
Fig. 5 is the control block diagram of the bridge arm tri-level mixed-rectification device of three-phase two of the present invention.
Fig. 6 is three-phase bridge uncontrollable rectifier circuit input side current waveform figure.
Fig. 7 is the bridge arm tri-level rectification circuit input side current waveform figure of three-phase two.
Fig. 8 is a kind of electric current and voltage oscillogram of the bridge arm tri-level mixed-rectification device input side of three-phase two.
Fig. 9 is a kind of bridge arm tri-level mixed-rectification device outlet side voltage oscillogram of three-phase two.
Embodiment
As shown in Fig. 2 a kind of bridge arm tri-level mixed-rectification device of three-phase two of the present invention, ea、eb、ecRespectively preferable three-phase Line voltage；ia、ib、icFor net side input current, ia1、ib1、ic1Electricity is inputted for the AC of two arm Asymmetry PWM rectifiers Stream, ia2、ib2、ic2For three-phase diode rectifier AC input current, L, R are respectively filter inductance and resistance；S1、S′1、 S2、S′2、S3、S′3、S4、S′4To form rectifier Z1In asymmetric rectifier bridge 8 IGBT switching tubes；C1、C2For on DC side Lower electric capacity, inFor middle site electric current, RLFor direct current lateral load；D1、D2、D3、D4、D5、D6To form rectifier Z2Middle three-phase commutation bridge Six diodes, Ld、SaFor rectifier Z2The boost inductance and switching tube of middle boost booster circuits；UdcElectricity is exported for DC side Pressure.
As shown in Fig. 3 (1)~Fig. 3 (9), for rectifier Z1, can be by circuit point according to the difference of power switch state For 9 kinds of working conditions：
Initially set up the concept of switch function：
In formula, fa、fbFor switching signal.
(1) state one：fa=1, fb=1 switching tube S1、S2、S3、S4Conducting, electric current ia1Through switching tube S1、S2And electric capacity C1Arrive Up to middle site n；Electric current ib1Through switching tube S3、S4And electric capacity C1Site n in arrival；Electric current ic1Flow directly into n points and ic1=in.This When a, 2 points of voltage U to middle site n of ban=Ubn=Udc/2。
(2) state two：fa=1, fb=0 switching tube S1、S2、S3、S′4Conducting, electric current ia1Through switching tube S1、S2And electric capacity C1 Site n in arrival；Electric current ib1Through switching tube S3、S′4Reach n points.Now Uan=Uab=Udc/2、Ubn=0.
(3) state three：fa=1, fb=-1 switching tube S1、S2、S′3Conducting, electric current ia1Through switching tube S1、S2And electric capacity C1Arrive Up to middle site n；Electric current ib1Through switching tube S '3And electric capacity C2N points are reached, now Uan=Udc/2、Ubn=-Udc/2。
(4) state four：fa=0, fb=1 switching tube S1、S′2、S3、S4Conducting, electric current ia1Through switching tube S1、S2Reach middle position Point n；Electric current ib1Through switching tube S3、S4And electric capacity C1Site n in arrival；Now Uan=0, Ubn=Udc/2。
(5) state five：fa=0, fb=0 switching tube S1、S′2、S3、S′4Conducting, Uan=0, Ubn=0.
(6) state six：fa=0, fb=-1 switching tube S1、S′2、S′3Conducting, electric current ia1Through switching tube S1、S′2Reach middle position Point n；Electric current ib1Through switching tube S '3And electric capacity C2Site n in arrival；Now Uan=0, Ubn=-Udc/2。
(7) state seven：fa=-1, fb=1 switching tube S '1、S3、S4Conducting, electric current ia1Through switching tube S '1And electric capacity C2Reach Middle site n；Electric current ib1Through switching tube S3、S4And electric capacity C1Site n in arrival, now Uan=-Udc/2、Ubn=Udc/2。
(8) state eight：fa=-1, fb=0 switching tube S '1、S3、S′4Conducting, electric current ia1Through switching tube S '1And electric capacity C2Arrive Up to middle site n；Electric current ib1Through switching tube S3、S′4Site n in arrival, now Uan=-Udc/2、Ubn=0.
(9) state nine：fa=-1, fb=-1 switching tube S '1、S′3Conducting, electric current ia1Through switching tube S '1And electric capacity C2Reach Middle site n；Electric current ib1Through switching tube S '3And electric capacity C2Site n in arrival, now Uan=-Udc/2、Ubn=-Udc/2。
Rectifier Z1Mathematical modeling it is as follows：
According to rectifier Z1Basic structural feature and Kirchhoff's law it is analyzed：
In formula, ea、eb、ecRespectively preferable three-phase power grid voltage；ia1、ib1、ic1For two arm Asymmetry PWM rectifiers AC input current；L, R is respectively filter inductance and resistance；uan、ubnRectifier bridge input point a, b is into DC side respectively Site n voltage；unoFor the voltage of n to o points in site in DC side.
As negligible resistance R, can be obtained by formula (3) in preferable power network：
The present invention is not limited merely to this, shown in its other two kinds of topologys such as Fig. 4 (a), Fig. 4 (b), its operation principle and figure Topology is similar shown in 2, is not repeated.
As shown in figure 5, the control strategy of the present invention is made up of Passive Shape Control, constant frequency PWM control, PI controls.
Line parameter circuit value is as follows：Three-phase power grid voltage virtual value is 220V, frequency f=50Hz；Two arm Asymmetry three-phases three Level PWM rectifier inductance L=2mH, the upper and lower electric capacity C of DC side1=C2=1500 μ F；Risen in conventional three-phase boost pfc circuits Voltage inductance Ld=5mH；Load RL=50 Ω, system switching frequency fs=10kHz, DC voltage set-point
Specific control process：
(1), to DC voltage Udc, rectifier Z1Ac-side current ia1、ib1、ic1And line voltage ea、eb、ecAdopted Sample；
(2), obtained DC voltage U will be measureddcWith given reference valueDifference imported into PI controls In device, and by the working condition of two rectifiers, obtain expectation electric current value 1,2；By ac-side current ia1、ib1、ic1Pass through electricity Rheology gets i in returnc1-ia1,ic1-ib1；Utilize phaselocked loop and line voltage ea、eb、ecMeasure electric network source phase information.
(3), obtained using grid phase information θ in step (2) and current transformation technologyAnd itself and ic1- ia1,ic1-ib1Error imported into switch signal generator, obtain rectifier Z1Switch controlling signal, controlling switch pipe moves Make.
(4), expectation electric current value 2 is imported into Passive Shape Control device, and outputs it signal and imports SPWM generators, is obtained Rectifier Z2Switch controlling signal, controlling switch pipe action.
Fig. 6 show three-phase bridge uncontrollable rectifier circuit input side stabling current oscillogram, according in specific implementation process Listed control parameter carries out simulating, verifying, can be seen that from waveform, now three-phase bridge uncontrollable rectifier circuit output current waveform In the presence of distortion, working condition is similar to active filter working condition.
Fig. 7 is the bridge arm tri-level rectification circuit input side current waveform figure of three-phase two, by the way that Fig. 6 and Fig. 7 waveforms are compared It can find, it is that the mixing bridge arm tri-level of three-phase two is whole that Fig. 6 and Fig. 7 current waveform, which is superimposed as Fig. 8 oscillograms, Fig. 8, The access power network current oscillogram of device input side is flowed, it can be seen that total current sine degree is preferable, and total current and electricity Same-phase is pressed, meets that rectifier output requires, when actual circuit designs due to the number of reduction electric capacity, can significantly reduce mixed Close rectifier volume.
Fig. 9 is the DC voltage output waveform figure of mixed-rectification device, and mixed-rectification device can be stablized as can be seen from Figure 9 DC voltage is exported, is stabilized to 650V, is about a power frequency period from initial time arrival stabilization time.
DSP Processor is by control circuit to three-phase bridge uncontrollable rectifier circuit and the bridge arm tri-level rectification circuit of three-phase two Carry out power equalization distribution.Effectively suppress harmonic wave, realize the stable output and net side unity power factor control of voltage.
Three level rectifyings that the present invention does not control boost rectifier and the bridge arm symmetrical structure of three-phase two by three-phase cascade are in parallel, Electric capacity can be reduced, improves the power density of converter, so as to increase substantially the operating efficiency of rectifier；It is proposed by the invention Mixing three-level rectifier to use full-controlled device be only 9, compared with traditional three-level rectifier bridge circuit, reduce The usage quantity of full-controlled device, it is cost-effective.

Claims (5)

1. a kind of bridge arm tri-level mixed-rectification device of three-phase two, including rectifier Z1, rectifier Z2, be characterized in that：
The rectifier Z1For the arm Asymmetry PWM rectifier of three-phase tri-level two, it includes 8 IGBT switching tubes：Switching tube S1、S1′、S2、S2′、S3、S3′、S4、S4', upper electric capacity C1, lower electric capacity C2, switching tube S1Source electrode connecting valve pipe S1' drain electrode, switch Pipe S1' source electrode difference connecting valve pipe S3' source electrode, lower electric capacity C2The other end, switching tube S1Drain electrode difference connecting valve pipe S2Source electrode, Switching tube S2' drain electrode, switching tube S2' source electrode difference connecting valve pipe S4' source electrode, lower electric capacity C2One end, switching tube S3' drain electrode connection Switching tube S3Source electrode, switching tube S3Drain electrode difference connecting valve pipe S4Source electrode, switching tube S4' drain electrode, switching tube S2Drain electrode, switching tube S4Drain electrode is all connected with electric capacity C1One end, upper electric capacity C1The lower electric capacity C of other end connection2One end；
The rectifier Z2For three-phase boost pfc circuits, it includes 6 diodes：D1、D2、D3、D4、D5、D6, filter inductance Ld1、Ld2, metal-oxide-semiconductor Sa, diode D01、D02, 6 diodes：D1、D2、D3、D4、D5、D6Connect and compose three-phase commutation bridge, described three Commutating phase bridging meets filter inductance Ld1One end, filter inductance Ld1Other end connection diode D01Anode, the three phase rectifier bridging Meet filter inductance Ld2One end, filter inductance Ld2Other end connection diode D02Negative electrode, metal-oxide-semiconductor SaDrain electrode connection diode D01Sun Pole, metal-oxide-semiconductor SaSource electrode connection diode D02Negative electrode；
Diode D01The upper electric capacity C of negative electrode connection1, one end, diode D02The lower electric capacity C of anode connection2The other end.
A kind of 2. bridge arm tri-level mixed-rectification device of three-phase two according to claim 1, it is characterised in that：The rectifier also wraps Include voltage sampling circuit, current sampling circuit, zero cross detection circuit, digital control circuit, PWM drive circuit；
The voltage sampling circuit is used for direct current lateral load RLBoth end voltage is sampled, and sampled value is defeated as PI controllers Enter signal；Direct current lateral load RLBoth ends connect electric capacity C respectively1One end, lower electric capacity C2The other end；
The current sampling circuit, for gathering two-phase alternating current；
The zero cross detection circuit, for detecting the voltage zero-crossing point of power grid moment, the sampling period is calculated by DSP, there is provided every The calculating phase angle of secondary control computing；
The digital control circuit, for rectifier Z1Constant frequency PWM control, rectifier Z2Passive Shape Control, outer voltage PI is controlled；
The PWM drive circuit, for driving rectifier Z1, rectifier Z2Switching tube.
A kind of 3. bridge arm tri-level mixed-rectification device of three-phase two according to claim 1, it is characterised in that：The rectifier also wraps Protection circuit is included, protection circuit collection two-way line voltage carries out the control signal of overvoltage/undervoltage protection, two-route wire voltage signal is turned Change d. c. voltage signal, when the voltage on divider resistance exceedes the protection domain of setting, controller is issued by locking signal.
A kind of 4. bridge arm tri-level mixed-rectification device of three-phase two according to claim 1, it is characterised in that：For rectifier Z1, According to the difference of power switch state, circuit is divided into 9 kinds of working conditions：
Initially set up the concept of switch function：
In formula, fa、fbFor switching signal；
(1) state one：fa=1, fb=1 switching tube S1、S2、S3、S4Conducting, electric current ia1Through switching tube S1、S2And electric capacity C1In arrival Site n；Electric current ib1Through switching tube S3、S4And electric capacity C1Site n in arrival；Electric current ic1Flow directly into n points and ic1=in；Now a, 2 points of voltage U to middle site n of ban=Ubn=Udc/2；
(2) state two：fa=1, fb=0 switching tube S1、S2、S3、S4' conducting, electric current ia1Through switching tube S1、S2And electric capacity C1Reach Middle site n；Electric current ib1Through switching tube S3、S4' reach n points；Now Uan=Uab=Udc/2、Ubn=0；
(3) state three：fa=1, fb=-1 switching tube S1、S2、S3' conducting, electric current ia1Through switching tube S1、S2And electric capacity C1In arrival Site n；Electric current ib1Through switching tube S3' and electric capacity C2N points are reached, now Uan=Udc/2、Ubn=-Udc/2；
(4) state four：fa=0, fb=1 switching tube S1、S2′、S3、S4Conducting, electric current ia1Through switching tube S1、S2Site n in arrival； Electric current ib1Through switching tube S3、S4And electric capacity C1Site n in arrival；Now Uan=0, Ubn=Udc/2；
(5) state five：fa=0, fb=0 switching tube S1、S2′、S3、S4' conducting, Uan=0, Ubn=0；
(6) state six：fa=0, fb=-1 switching tube S1、S2′、S3' conducting, electric current ia1Through switching tube S1、S2Site n in ' arrival； Electric current ib1Through switching tube S3' and electric capacity C2Site n in arrival；Now Uan=0, Ubn=-Udc/2；
(7) state seven：fa=-1, fb=1 switching tube S1′、S3、S4Conducting, electric current ia1Through switching tube S1' and electric capacity C2Reach middle position Point n；Electric current ib1Through switching tube S3、S4And electric capacity C1Site n in arrival, now Uan=-Udc/2、Ubn=Udc/2；
(8) state eight：fa=-1, fb=0 switching tube S1′、S3、S4' conducting, electric current ia1Through switching tube S1' and electric capacity C2In arrival Site n；Electric current ib1Through switching tube S3、S4Site n in ' arrival, now Uan=-Udc/2、Ubn=0；
(9) state nine：fa=-1, fb=-1 switching tube S1′、S3' conducting, electric current ia1Through switching tube S1' and electric capacity C2Reach middle position Point n；Electric current ib1Through switching tube S3' and electric capacity C2Site n in arrival, now Uan=-Udc/2、Ubn=-Udc/2。
A kind of 5. bridge arm tri-level mixed-rectification device of three-phase two according to claim 1, it is characterised in that：Control strategy is by nothing Source control, constant frequency PWM control, PI control compositions；Specific control process：
(1) to DC voltage Udc, rectifier Z1Ac-side current ia1、ib1、ic1And line voltage ea、eb、ecSampled；
(2) obtained DC voltage U will be measureddcWith given reference valueDifference imported into PI controllers, and pass through two The working condition of individual rectifier, obtain expectation electric current value a, b；By ac-side current ia1、ib1、ic1I is obtained by current transformationc1- ia1,ic1-ib1；Utilize phaselocked loop and line voltage ea、eb、ecMeasure electric network source phase information；
(3) grid phase information θ and current transformation technology in step (2) is utilized to obtainAnd itself and ic1-ia1, ic1-ib1Error imported into switch signal generator, obtain rectifier Z1Switch controlling signal, controlling switch pipe action；
(4) expectation electric current value b is imported into Passive Shape Control device, and outputs it signal and import SPWM generators, obtain rectification Device Z2Switch controlling signal, controlling switch pipe action.
CN201711420890.1A 2017-12-25 2017-12-25 Three-phase two-bridge arm three-level hybrid rectifier Active CN107888096B (en)

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CN108462384A (en) * 2018-06-09 2018-08-28 南昌航空大学 A kind of three-phase step-down type PFC rectification circuits
CN108777547A (en) * 2018-05-28 2018-11-09 东南大学 A kind of friendship-friendship power inverter of no DC bus energy-storage travelling wave tube
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
CN113114033A (en) * 2021-05-18 2021-07-13 西南交通大学 Direct-current-side secondary ripple suppression device for traction transmission system and control method
CN113364312A (en) * 2021-06-16 2021-09-07 华工科技(广东)有限公司 Three-level rectification level suitable for intelligent frequency-shift water treatment power supply front stage

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CN106787857A (en) * 2015-11-25 2017-05-31 纪新辉 Unidirectional mixing three-phase voltage type rectifier
CN208046474U (en) * 2017-12-25 2018-11-02 三峡大学 A kind of two bridge arm tri-level mixed-rectification device of three-phase

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CN101309054A (en) * 2008-06-20 2008-11-19 南京航空航天大学 Three-level double boost energy feedback PWM rectification circuit and control method thereof
WO2014107938A1 (en) * 2013-01-08 2014-07-17 广东志成冠军集团有限公司 Current source type rectifier and grid-connected control method based on virtual resistor
CN106787857A (en) * 2015-11-25 2017-05-31 纪新辉 Unidirectional mixing three-phase voltage type rectifier
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Publication number Priority date Publication date Assignee Title
CN108777547A (en) * 2018-05-28 2018-11-09 东南大学 A kind of friendship-friendship power inverter of no DC bus energy-storage travelling wave tube
CN108462384A (en) * 2018-06-09 2018-08-28 南昌航空大学 A kind of three-phase step-down type PFC rectification circuits
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
CN113114033A (en) * 2021-05-18 2021-07-13 西南交通大学 Direct-current-side secondary ripple suppression device for traction transmission system and control method
CN113364312A (en) * 2021-06-16 2021-09-07 华工科技(广东)有限公司 Three-level rectification level suitable for intelligent frequency-shift water treatment power supply front stage
CN113364312B (en) * 2021-06-16 2023-05-30 华工科技(广东)有限公司 Three-level rectifying circuit suitable for intelligent frequency drift water treatment power supply front stage

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