CN108649818A - Three-phase step-down type rectifier and its control method - Google Patents

Three-phase step-down type rectifier and its control method Download PDF

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Publication number
CN108649818A
CN108649818A CN201810354769.1A CN201810354769A CN108649818A CN 108649818 A CN108649818 A CN 108649818A CN 201810354769 A CN201810354769 A CN 201810354769A CN 108649818 A CN108649818 A CN 108649818A
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phase
bridge arm
switch module
arm switch
bridge
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CN108649818B (en
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雷家兴
冯双
赵剑锋
陈武
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Southeast University
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Southeast University
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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
    • H02M7/2173—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
    • 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
    • H02M7/066—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 particular circuits having a special characteristic
    • 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

Abstract

The invention discloses a kind of three-phase step-down type rectifiers, including input filter, three phase controllable commutating bridge and uncontrollable rectifier bridge；Each phase of three phase controllable commutating bridge includes upper bridge arm and lower bridge arm, upper bridge arm is equipped with upper bridge arm switch module, lower bridge arm is equipped with lower bridge arm switch module, three phase controllable commutating bridge is connect with uncontrollable rectifier bridge common DC bus, three phase mains connects the exchange input side of the exchange input side of three phase controllable commutating bridge, the neutral point of three phase mains or the neutral point connection uncontrollable rectifier bridge of input filter by input filter.The invention also discloses the methods of control three-phase step-down type rectifier.Present invention significantly reduces the voltage stress of controllable switch device.

Description

Three-phase step-down type rectifier and its control method
Technical field
The present invention relates to power inverter fields, more particularly to a kind of three-phase step-down type rectifier and its control method.
Background technology
Three-Phase PWM Rectifier includes mainly being based on the booster type rectifier of voltage source type converter (VSC) and based on electric current The voltage-dropping type rectifier of source code converter (CSC).Wherein, booster type rectifier requires DC bus-bar voltage necessarily to be greater than input friendship Line voltage peak value, and voltage-dropping type rectifier allows DC bus-bar voltage to be less than input line voltage peak value.Therefore, straight for needing Galvanic electricity presses lower application scenario, such as charging system for electric automobile, driving control system for electric machine, superconductive energy storage system, decompression Type rectifier has larger advantage.
The conventional three-phase voltage-dropping type rectifier of most study is as shown in Figure 1, it includes mainly that 6 inverse-impedance type switches are single at present Member constitutes three phase controllable commutating bridge, input side LC filters, DC bus side fly-wheel diode.Three-phase input power supply is filtered by LC Wave device is connected to the input terminal of controllable rectifier bridge.Fly-wheel diode provides circulation path for DC bus current, while generating zero Export instantaneous voltage.Wherein, inverse-impedance type switch unit it is generally in sequential series by a controllable switch device and a diode and At.
The three-phase step-down type rectifier has the disadvantage that：Controllable switch device is born most in each inverse-impedance type switch unit Big voltage is the amplitude of input line voltage.Meet u with three-phase input voltageA>0>uB>uCFor be explained.According to three-phase The control principle of voltage-dropping type rectifier, under such state, the switch S of bridge arm in A phasesAPIt keeps leading in a switch periods It is logical, B phase lower bridge arm switches SBN, C phase lower bridge arm switches SCN, sustained diodeFAlternate conduction.Work as DFWhen conducting, SBNAnd SCN Shutdown.S at this timeBNAnd SCNThe voltage stress born is respectively uA-uBAnd uA-uC, that is, it is respectively subjected to two line electricity of maximum absolute value Pressure.For three-phase 380V/50Hz input powers, the maximum value of line voltage is 380 × 1.414 ≈ 537V.
This disadvantage brings following problem：(1) voltage stress is higher, and the device capacitance needed is bigger, and which increase controllable The cost and type selecting difficulty of switching device；(2) voltage stress is higher, and the switching loss of power device is bigger, this is unfavorable for improving The transfer efficiency of system；(3) it is limited to the technological level of current power device, higher voltage stress limits the switch of device Frequency, this is unfavorable for the power density of raising system；(4) higher voltage stress also reduces the operational reliability of rectifier.
Invention content
Goal of the invention：The object of the present invention is to provide a kind of three-phase step-down type rectifier that can reduce voltage stress and its Control method.
Technical solution：To reach this purpose, the present invention uses following technical scheme：
Three-phase step-down type rectifier of the present invention, including input filter, three phase controllable commutating bridge and uncontrollable rectifier Bridge；Each phase of three phase controllable commutating bridge includes upper bridge arm and lower bridge arm, and upper bridge arm is equipped with upper bridge arm switch module, lower bridge arm Equipped with lower bridge arm switch module, three phase controllable commutating bridge is connect with uncontrollable rectifier bridge common DC bus, and three phase mains passes through input Filter connects the exchange input side of three phase controllable commutating bridge, and the neutral point of three phase mains or the neutral point of input filter connect Connect the exchange input side of uncontrollable rectifier bridge.
Further, in the three phase controllable commutating bridge, upper bridge arm switch module and lower bridge arm switch module include reverse blocking Type switch unit, and the inverse-impedance type switch unit of upper bridge arm of every phase and the inverse-impedance type switch unit of lower bridge arm are sequentially connected with, Exchange input side of the junction as corresponding phase.
Further, the inverse-impedance type switch unit includes concatenated controllable switch device and diode.
Further, the uncontrollable rectifier bridge includes two diodes connected in sequence, and junction is as uncontrollable rectifier bridge Exchange input side.
Further, the input filter includes three-phase filter inductance and three-phase filter capacitor, and three-phase filter inductance includes First phase filter inductance LA, the second phase filter inductance LBWith third phase filter inductance LC, three-phase filter capacitor include the first phase filtering Capacitance CA, the second phase filter capacitor CBWith third phase filter capacitor CC；First phase power supply passes through the first phase filter inductance LAConnection three The exchange input side of first phase of phase controllable rectifier bridge, the second phase power supply pass through the second phase filter inductance LBIt is controllably whole to connect three-phase The exchange input side of the second phase of bridge is flowed, third phase power supply passes through third phase filter inductance LCConnect the of three phase controllable commutating bridge The exchange input side of three-phase, the first phase filter capacitor CAOne end connection three phase controllable commutating bridge the first phase exchange input Side, the second phase filter capacitor CBOne end connection three phase controllable commutating bridge the second phase exchange input side, third phase filtered electrical Hold CCOne end connection three phase controllable commutating bridge third phase exchange input side, the first phase filter capacitor CAThe other end, second Phase filter capacitor CBThe other end and third phase filter capacitor CCThe other end as the neutral point of input filter.
Further, the neutral point of the neutral point of the input filter and three phase mains connects.
The method for controlling three-phase step-down type rectifier of the present invention, including following procedure：
1) by three-phase input voltage uA、uB、uCIt is divided into u according to the size of absolute valuemax、umid、umin；
2) for the phase of input voltage maximum absolute value, the thereon control of bridge arm switch module and lower bridge arm switch module Journey is as follows：Work as umaxWhen >=0, upper bridge arm switch module conducting, the shutdown of lower bridge arm switch module, the upper bridge arm switch module of conducting Duty ratio be dmax；Work as umaxWhen ＜ 0, upper bridge arm switch module shutdown, lower bridge arm switch module is connected, and the lower bridge arm of conducting is opened The duty ratio for closing module is dmax；
3) for the big phase of input voltage absolute value time, the thereon control of bridge arm switch module and lower bridge arm switch module Journey is as follows：Work as umidWhen >=0, upper bridge arm switch module conducting, the shutdown of lower bridge arm switch module, the upper bridge arm switch module of conducting Duty ratio be dmid；Work as umidWhen ＜ 0, upper bridge arm switch module shutdown, lower bridge arm switch module is connected, and the lower bridge arm of conducting is opened The duty ratio for closing module is dmid；
4) for the phase of input voltage absolute value minimum, the thereon control of bridge arm switch module and lower bridge arm switch module Journey is as follows：Work as uminWhen >=0, upper bridge arm switch module conducting, the shutdown of lower bridge arm switch module, the upper bridge arm switch module of conducting Duty ratio be dmin；Work as uminWhen ＜ 0, upper bridge arm switch module shutdown, lower bridge arm switch module is connected, and the lower bridge arm of conducting is opened The duty ratio for closing module is dmin；
5) remaining time other than 2), 3) He 4) switch periods remove, all switch modules are fully closed disconnected, do not control All diodes are forced to be connected in rectifier bridge, turn-on time 1-dmax。
Above-mentioned dmax、dmidAnd dminAs shown in formula (1)：
In formula (1),For the desired value of DC bus-bar voltage.
Advantageous effect：The invention discloses three-phase step-down type rectifier and its control method, controllable switch device is born Maximum voltage stress is the input phase voltage peak, three-phase 380V/50Hz is inputted, maximum voltage stress is only 311V.This is Maximum voltage stress in traditional technologyI.e. present invention significantly reduces the voltage stress of controllable switch device.By This brings following advantageous effect：
(1) cost and type selecting difficulty of device are significantly reduced；
(2) switching loss of device is reduced, and then improves the transfer efficiency of rectifier；
(3) higher switching frequency may be used, to improve the power density of rectifier；
(4) operational reliability of rectifier is improved.
Description of the drawings
Fig. 1 is the circuit diagram of conventional three-phase voltage-dropping type rectifier；
Fig. 2 is the circuit diagram of three-phase step-down type rectifier in the specific embodiment of the invention；
Fig. 3 is in the specific embodiment of the invention when input voltage meets uA>0>uB>uCWhen voltage-dropping type rectifier switch Sequence；
Fig. 4 is that the switch of three-phase lower bridge arm in the specific embodiment of the invention only has SBNCurrent flow paths when conducting；
Fig. 5 is that the switch of three-phase lower bridge arm in the specific embodiment of the invention only has SCNCurrent flow paths when conducting；
Fig. 6 is the current flow paths that the switch of three-phase lower bridge arm in the specific embodiment of the invention is not turned on.
Specific implementation mode
Technical scheme of the present invention is further introduced with attached drawing With reference to embodiment.
Own " the first phase " in present embodiment and each mean " A phases ", all " the second phases " each means " B phases ", owns " third phase " is each meant " C phases ".
Present embodiment discloses a kind of three-phase step-down type rectifier, is changed on the basis of traditional technology Into, i.e., by the single fly-wheel diode of DC bus replace with two diodes composition bridge arm.Specifically, as shown in Fig. 2, originally The three-phase step-down type rectifier that specific implementation mode provides includes input filter 1, three phase controllable commutating bridge 3 and uncontrollable rectifier bridge 4；Each phase of three phase controllable commutating bridge 3 includes upper bridge arm and lower bridge arm, and upper bridge arm is equipped with upper bridge arm switch module, lower bridge arm Equipped with lower bridge arm switch module, three phase controllable commutating bridge 3 is connect with 4 common DC bus of uncontrollable rectifier bridge, and three phase mains passes through defeated Enter the exchange input side that filter 1 connects three phase controllable commutating bridge 3, the neutral point of three phase mains or the neutrality of input filter The exchange input side of point connection uncontrollable rectifier bridge 4.The neutral point of input filter 1 and the neutral point of three phase mains connect.
In three phase controllable commutating bridge 3, upper bridge arm switch module and lower bridge arm switch module include inverse-impedance type switch unit 2, and the inverse-impedance type switch unit of upper bridge arm of every phase and the inverse-impedance type switch unit of lower bridge arm are sequentially connected with, junction conduct The exchange input side of corresponding phase.Inverse-impedance type switch unit 2 includes concatenated controllable switch device and diode, respectively：It is corresponding In the controllable switch device S of bridge arm in the first phaseAPWith diode DAP, correspond to the controllable switch device S of the first phase lower bridge armAN With diode DAN, correspond to the controllable switch device S of bridge arm in the second phaseBPWith diode DBP, correspond to the second phase lower bridge arm Controllable switch device SBNWith diode DBN, correspond to the controllable switch device S of bridge arm on third phaseCPWith diode DCP, correspond to The controllable switch device S of second phase lower bridge armCNWith diode DCN。
Uncontrollable rectifier bridge 4 includes two diodes connected in sequence, and junction is inputted as the exchange of uncontrollable rectifier bridge 4 Side.
Input filter 1 includes three-phase filter inductance and three-phase filter capacitor, and three-phase filter inductance is filtered including the first phase Inductance LA, the second phase filter inductance LBWith third phase filter inductance LC, three-phase filter capacitor includes the first phase filter capacitor CA, Two-phase filter capacitor CBWith third phase filter capacitor CC；First phase power supply passes through the first phase filter inductance LAIt is controllably whole to connect three-phase The exchange input side of the first phase of bridge 3 is flowed, the second phase power supply passes through the second phase filter inductance LBConnect three phase controllable commutating bridge 3 The exchange input side of second phase, third phase power supply pass through third phase filter inductance LCConnect the third phase of three phase controllable commutating bridge 3 Exchange input side, the first phase filter capacitor CAOne end connection three phase controllable commutating bridge 3 the first phase exchange input side, the Two-phase filter capacitor CBOne end connection three phase controllable commutating bridge 3 the second phase exchange input side, third phase filter capacitor CC's One end connects the exchange input side of the third phase of three phase controllable commutating bridge 3, the first phase filter capacitor CAThe other end, the second phase filter Wave capacitance CBThe other end and third phase filter capacitor CCNeutral point of the other end as input filter 1.
The method that present embodiment also discloses control three-phase step-down type rectifier, including following procedure：
1) by three-phase input voltage uA、uB、uCIt is divided into u according to the size of absolute valuemax、umid、umin；
2) for the phase of input voltage maximum absolute value, the thereon control of bridge arm switch module and lower bridge arm switch module Journey is as follows：Work as umaxWhen >=0, upper bridge arm switch module conducting, the shutdown of lower bridge arm switch module, the upper bridge arm switch module of conducting Duty ratio be dmax；Work as umaxWhen ＜ 0, upper bridge arm switch module shutdown, lower bridge arm switch module is connected, and the lower bridge arm of conducting is opened The duty ratio for closing module is dmax；
3) for the big phase of input voltage absolute value time, the thereon control of bridge arm switch module and lower bridge arm switch module Journey is as follows：Work as umidWhen >=0, upper bridge arm switch module conducting, the shutdown of lower bridge arm switch module, the upper bridge arm switch module of conducting Duty ratio be dmid；Work as umidWhen ＜ 0, upper bridge arm switch module shutdown, lower bridge arm switch module is connected, and the lower bridge arm of conducting is opened The duty ratio for closing module is dmid；
4) for the phase of input voltage absolute value minimum, the thereon control of bridge arm switch module and lower bridge arm switch module Journey is as follows：Work as uminWhen >=0, upper bridge arm switch module conducting, the shutdown of lower bridge arm switch module, the upper bridge arm switch module of conducting Duty ratio be dmin；Work as uminWhen ＜ 0, upper bridge arm switch module shutdown, lower bridge arm switch module is connected, and the lower bridge arm of conducting is opened The duty ratio for closing module is dmin；
5) remaining time other than 2), 3) He 4) switch periods remove, all switch modules are fully closed disconnected, do not control All diodes are forced to be connected in rectifier bridge 4, turn-on time 1-dmax。
Above-mentioned dmax、dmidAnd dminAs shown in formula (1)：
In formula (1),For the desired value of DC bus-bar voltage.
Below with three-phase input voltage uA>0>uB>uCFor, above method is introduced.
Fig. 3 illustrates the operation logic schematic diagram of the voltage-dropping type rectifier, with three-phase input voltage u in figureA>0>uB>uCFor Example.In this case, in a switch periods TsIt is interior, B phase lower bridge arm switches SBN, C phase lower bridge arm switches SCNIt is connected in order.Its Middle SBNThe duty ratio of conducting is dB, SCNThe duty ratio of conducting is dC。dBAnd dCExpression formula be：
In formula,For the desired value of DC bus-bar voltage.Upper bridge arm is switched, S is worked asBNOr SCNWhen conducting, bridge in A phases Arm switch SAPIt is also switched on, the shutdown of remaining time；Bridge arm switch is held off on remaining.In the remaining time of a switch periods, SBNAnd SCNIt is turned off, in order to ensure the circulation path of DC bus current, diode DOPAnd DONIt is forced to be connected.
The DC bus current circulation path under three kinds of states is set forth in dotted line with the arrow in Fig. 4, Fig. 5 and Fig. 6. Since A phase voltages are maximum, in figures 4 and 5, bridge arm switch S in B phasesBPWith bridge arm switch S in C phasesCPVoltage is not subject to answer Power, corresponding voltage stress is respectively by diode DBPAnd DCPIt bears.Lower bridge arm is switched, due to uA>0>uB>uC, switch SAN、 SBNIt is not subject to voltage stress, corresponding voltage stress is respectively by diode DANAnd DBNIt bears.For switch SCN, when it is connected, Its voltage stress born is 0；When it is turned off and SBNWhen conducting, the voltage stress born is uB-uC.It is easy to extrapolate uB-uC ≤-uC≤uA。
In figure 6, since the switch of controllable rectifier bridge is all off, to ensure DC bus current circulation path, two poles Pipe DOPAnd DONIt is forced to be connected.Ignore the pressure drop of diode, is then believed that the ends DC bus P and N-terminal current potential and neutral point at this time Current potential O's is identical.Then in this case, due to uA>0>uB>uC, switch SBP、SCP、SANIt is not subject to voltage stress, switch SAP、SBN And SCNThe voltage stress born is respectively uA、-uB、-uC。
In conclusion working as uA>0>uB>uCWhen, in a switch periods, the voltage that any one controllable switch is born is answered Power is no more than the absolute value of phase voltage.According to the symmetry of circuit, work as uA、uB、uCWhen meeting other voltage swing relationships, this Conclusion is still set up.Therefore, in rectifier unit of the invention, the maximum voltage stress of controllable switch device is input phase voltage Amplitude.Three-phase 380V/50Hz is inputted, maximum voltage stress is only 311V, is 0.58 times of 537V in traditional technology.

Claims (7)

1. three-phase step-down type rectifier, it is characterised in that：It does not control including input filter (1), three phase controllable commutating bridge (3) and whole Flow bridge (4)；Each phase of three phase controllable commutating bridge (3) includes upper bridge arm and lower bridge arm, and upper bridge arm is equipped with upper bridge arm switching molding Block, lower bridge arm are equipped with lower bridge arm switch module, and three phase controllable commutating bridge (3) is connect with uncontrollable rectifier bridge (4) common DC bus, and three Phase power supply by input filter (1) connect three phase controllable commutating bridge (3) exchange input side, the neutral point of three phase mains or The exchange input side of the neutral point connection uncontrollable rectifier bridge (4) of input filter.
2. three-phase step-down type rectifier according to claim 1, it is characterised in that：In the three phase controllable commutating bridge (3), Upper bridge arm switch module and lower bridge arm switch module are including inverse-impedance type switch unit (2), and the reverse blocking of the upper bridge arm per phase Type switch unit and the inverse-impedance type switch unit of lower bridge arm are sequentially connected with, exchange input side of the junction as corresponding phase.
3. three-phase step-down type rectifier according to claim 2, it is characterised in that：Inverse-impedance type switch unit (2) packet Include concatenated controllable switch device and diode.
4. three-phase step-down type rectifier according to claim 1, it is characterised in that：The uncontrollable rectifier bridge (4) includes two A diode connected in sequence, exchange input side of the junction as uncontrollable rectifier bridge (4).
5. three-phase step-down type rectifier according to claim 1, it is characterised in that：The input filter (1) includes three Phase filter inductance and three-phase filter capacitor, three-phase filter inductance include the first phase filter inductance LA, the second phase filter inductance LBWith Three-phase filter inductance LC, three-phase filter capacitor includes the first phase filter capacitor CA, the second phase filter capacitor CBWith third phase filtered electrical Hold CC；First phase power supply passes through the first phase filter inductance LAThe exchange input side of the first phase of three phase controllable commutating bridge (3) is connected, Second phase power supply passes through the second phase filter inductance LBConnect the exchange input side of the second phase of three phase controllable commutating bridge (3), third Phase power supply passes through third phase filter inductance LCConnect the exchange input side of the third phase of three phase controllable commutating bridge (3), the filter of the first phase Wave capacitance CAOne end connection three phase controllable commutating bridge (3) the first phase exchange input side, the second phase filter capacitor CBOne end Connect the exchange input side of the second phase of three phase controllable commutating bridge (3), third phase filter capacitor CCOne end connection three-phase it is controllable The exchange input side of the third phase of rectifier bridge (3), the first phase filter capacitor CAThe other end, the second phase filter capacitor CBIt is another End and third phase filter capacitor CCNeutral point of the other end as input filter (1).
6. three-phase step-down type rectifier according to claim 1, it is characterised in that：The neutrality of the input filter (1) Point is connect with the neutral point of three phase mains.
7. the method for control three-phase step-down type rectifier according to claim 4, it is characterised in that：Including following procedure：
1) by three-phase input voltage uA、uB、uCIt is divided into u according to the size of absolute valuemax、umid、umin；
2) for the phase of input voltage maximum absolute value, the control process of bridge arm switch module and lower bridge arm switch module is such as thereon Under：Work as umaxWhen >=0, upper bridge arm switch module conducting, lower bridge arm switch module turns off, and the upper bridge arm switch module of conducting accounts for Sky is than being dmax；Work as umaxWhen ＜ 0, upper bridge arm switch module shutdown, the conducting of lower bridge arm switch module, the lower bridge arm switching molding of conducting The duty ratio of block is dmax；
3) for the big phase of input voltage absolute value time, the control process of bridge arm switch module and lower bridge arm switch module is such as thereon Under：Work as umidWhen >=0, upper bridge arm switch module conducting, lower bridge arm switch module turns off, and the upper bridge arm switch module of conducting accounts for Sky is than being dmid；Work as umidWhen ＜ 0, upper bridge arm switch module shutdown, the conducting of lower bridge arm switch module, the lower bridge arm switching molding of conducting The duty ratio of block is dmid；
4) for the phase of input voltage absolute value minimum, the control process of bridge arm switch module and lower bridge arm switch module is such as thereon Under：Work as uminWhen >=0, upper bridge arm switch module conducting, lower bridge arm switch module turns off, and the upper bridge arm switch module of conducting accounts for Sky is than being dmin；Work as uminWhen ＜ 0, upper bridge arm switch module shutdown, the conducting of lower bridge arm switch module, the lower bridge arm switching molding of conducting The duty ratio of block is dmin；
5) remaining time other than 2), 3) He 4) switch periods remove, all switch modules are fully closed disconnected, uncontrollable rectifier All diodes are forced to be connected in bridge (4), turn-on time 1-dmax。
Above-mentioned dmax、dmidAnd dminAs shown in formula (1)：
In formula (1),For the desired value of DC bus-bar voltage.
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