CN109510487A - The two-way AC/DC converter of current mode single-stage isolated three-phase and its modulation strategy - Google Patents

The two-way AC/DC converter of current mode single-stage isolated three-phase and its modulation strategy Download PDF

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Publication number
CN109510487A
CN109510487A CN201811380205.1A CN201811380205A CN109510487A CN 109510487 A CN109510487 A CN 109510487A CN 201811380205 A CN201811380205 A CN 201811380205A CN 109510487 A CN109510487 A CN 109510487A
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switching tube
phase
collector
emitter
switch
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CN109510487B (en
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顾玲
彭凯
蒋雪峰
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • 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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac 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
    • H02M7/537—Conversion of dc power input into ac 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, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac 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, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H02M7/53875—Conversion of dc power input into ac 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The present invention provides a kind of two-way AC/DC converter of current mode single-stage isolated three-phase and its modulation strategies, including exchange side LC filter, exchange side three-phase bridge arm, isolating transformer, DC side bridge arm, DC side energy storage inductor, DC side filter capacitor.Exchanging side LC filter includes three inductance and three capacitors, and exchange side three-phase bridge arm is made of 18 switching tubes, and isolating transformer includes three transformers, and DC side bridge arm is made of six switching tubes.

Description

The two-way AC/DC converter of current mode single-stage isolated three-phase and its modulation strategy
Technical field
The present invention relates to a kind of AC/DC converter technology, especially a kind of current mode single-stage suitable for large-power occasions The two-way AC/DC converter of three-phase and its modulation strategy is isolated.
Background technique
In order to realize the sustainable development of low-carbon environment-friendly and economy, the generations of electricity by new energy such as solar power generation, wind-power electricity generation Technology, which has been obtained, to be widely applied.But power grid itself does not have the function of storage energy, due to the shadow of natural conditions Sound can make the generations of electricity by new energy such as photovoltaic, wind-powered electricity generation biggish fluctuation occur, it is therefore desirable to which energy storage device maintains the stabilization of system Property.Battery has many advantages, such as voltage stabilization, power supply is reliable, flexible for installation as a kind of energy storage device, in micro-grid system Middle extensive application.Battery group can release storage electricity in grid generation amount deficiency；When power generating network electricity is extra Absorb supplement electricity.In order to realize that the two-way flow of energy between battery group and power grid needs to be arranged between a change Parallel operation.In large-power occasions, generally require using the two-way AC/DC converter of three-phase.
High frequency electrical isolation may be implemented in isolated form three-phase AC/DC converter, but these converters mostly use greatly single change Depressor.When handling high-power, transformer and former secondary-side switch tube voltage and current stress are bigger, are unfavorable for power The type selecting of device and the selection of magnetic core of transformer, to influence the design of converter.In order to reduce stresses of parts, generally use Multiple module paralleling, but volume cost is increased, and need to consider the problems of parallel current-sharing, so that control is also more complicated.
For the service life for extending battery, side and storage of the big inductance in current source characteristic will be had in reversible transducer Battery is connected to reduce DC side current ripples.
Summary of the invention
The purpose of the present invention is to provide a kind of two-way AC/DC converter of current mode single-stage isolated three-phase and its modulation plans Slightly, the converter and modulation strategy can reduce switching tube current stress, reduce transformer processing power and reduce DC side The ripple of electric current.
Realize the technical solution one of the object of the invention are as follows: a kind of two-way AC/DC converter of current mode single-stage isolated three-phase and Its modulation strategy, which is characterized in that including exchange lateral circuit, isolating transformer and direct current lateral circuit, exchange lateral circuit includes handing over Side filter inductance, exchange side filter capacitor, exchange side three-phase bridge arm are flowed, DC side includes DC side bridge arm, DC side energy storage electricity Sense and DC side filter capacitor, isolating transformer are made of three transformers；The bridge arm of the exchange every one-phase circuit in side includes upper double To switch, middle two-way switch, lower two-way switch, exchange the upper two-way switch of the bridge arm of the every one-phase circuit in side, middle two-way switch, under The connected one end of two-way switch connects to one end of corresponding filter inductance respectively and connect with one end of corresponding filter capacitor, exchanges Upper two-way switch, middle two-way switch, the other end of lower two-way switch of the bridge arm of the every one-phase circuit in side are opposite with other two respectively The other end for the two-way switch answered, which is connected, constitutes three points of common connection, then three with isolating transformer primary side winding respectively The port of corresponding external connection is connected, exchange the other ends of three filter inductances of side respectively with exchange side power supply and (rectifies or simultaneously Net inversion) or threephase load connection (independent inversion), it exchanges and is connected between three filter capacitor other ends of side；DC side Each bridge arm is composed in series by two switching tubes and the midpoint of each bridge arm is corresponding to isolating transformer vice-side winding respectively The port of external connection is connected, three bridge arm parallel connections, connection DC side filtering after bridge arm one end is connected with DC side energy storage inductor The anode of capacitor, the bridge arm other end connect the negative terminal of DC side filter capacitor.
A kind of Space Vector Modulation Strategy for above-mentioned converter, comprising the following steps:
Step 1, it usesFormat define switch state；
Step 2, Space current vector synthesized by the switch state of all various combinations is formed into hexagon, will entirely put down Face is divided into 6 sectors；
Step 3, to carry out Vector modulation according to the sector of division minimum according to switch state switching times and guarantee three The principle of transformer voltage-second balance determines switch state switch sequence and obtains the time of each switch state；
Exchange side three-phase bridge arm is made of 18 switching tubes, and every phase bridge arm in three-phase bridge arm is opened by six respectively Guan Zucheng is closed, wherein
A phase bridge arm includes the first to the 6th switching tube, and B phase bridge arm includes the 7th to the 12nd switching tube, and C phase bridge arm includes 13rd switching tube is closed to eighteenmo manages；The emitter of first switch tube is connected as A phase with the emitter of second switch Upper two-way switch, the middle two-way switch that the emitter of third switching tube is connected with the emitter of the 4th switching tube as A phase, The lower two-way switch that the emitter of five switching tubes is connected with the emitter of the 6th switching tube as A phase, the current collection of second switch Pole is connected with the collector of the collector of third switching tube, the 5th switching tube, the emitter and the 8th switching tube of the 7th switching tube Emitter be connected upper two-way switch as B phase, the emitter phase continuous cropping of the emitter and the tenth switching tube of the 9th switching tube For the middle two-way switch of B phase, be connected with the emitter of the 12nd switching tube as B phase lower pair of the emitter of the 11st switching tube To switch, the collector of the 8th switching tube is connected with the collector of the collector of the 9th switching tube, the 11st switching tube, and the 13rd The upper two-way switch that the emitter of switching tube is connected with the emitter of the 14th switching tube as C phase, the hair of the 15th switching tube The middle two-way switch that emitter-base bandgap grading is connected with the emitter that sixteenmo closes pipe as C phase, the emitter and the tenth of the 17th switching tube The emitters of eight switching tubes is connected the lower two-way switch as C phase, the collector of the 14th switching tube and the 15th switching tube Collector, the collector of the 17th switching tube are connected, the collector of the collector of first switch tube and the 7th switching tube, the 13rd The collector of switching tube is connected as a port for connecting transformer, the collector of the 4th switching tube and the collection of the tenth switching tube The collector that electrode, sixteenmo close pipe is connected as a port for connecting transformer, the collector of the 6th switching tube and the Collector, the eighteenmo of 12 switching tubes close a port that the collector of pipe is connected as connection transformer；The direct current Side bridge arm is made of six switching tubes, wherein the emitter of the 19th switching tube is connected with the collector of the 20th switching tube, the The emitter of 21 switching tubes is connected with the collector of the 22nd switching tube, the emitter and second of the 23rd switching tube The collectors of 14 switching tubes is connected, the collector of the collector of the 19th switching tube and the 21st switching tube, the 23rd The collector of switching tube is connected, and connects the anode of connection DC side filter capacitor after DC side energy storage inductor, the 20th switching tube Emitter be connected with the emitter of the emitter of the 22nd switching tube, the 24th switching tube, connect DC side filtered electrical The negative terminal of appearance；
Do not distinguish two switching tubes of each two-way switch of control exchange side:
S in step 1a、Sb、ScRespectively represent 18 switching tube Q in exchange side three-phase bridge armA1~6、QB1~6、QC1~6Open Off status, each two-way switch for exchanging side includes two connected switching tubes, works as Qi1Or Qi2S when conductingiIt is -1, works as Qi3Or Qi4S when conductingiIt is 0, works as Qi5Or Qi6S when conductingiIt is 1, works as QI1~6When being all not turned on, SiFor x, wherein i=a, b, c divide table generation Table A phase, B phase, C phase；Sd、Se、SfRespectively represent six switching tube Q of DC side bridge arms1,2、Qs3,4、Qs5,6Switch state, when Switching tube Qs1S when conductingd=1, as switching tube Qs2S when conductingd=0, as switching tube Qs1、Qs2S when being all not turned ond=x, works as switch Pipe Qs3S when conductinge=1, as switching tube Qs4S when conductinge=0, as switching tube Qs3、Qs4S when being all not turned one=x, works as switching tube Qs5S when conductingf=1, as switching tube Qs6S when conductingf=0, as switching tube Qs5、Qs6S when being all not turned onf=x, when work is rectifying It also can choose when mode and do not control DC side switching tube；A, B, C respectively represent A, B, C three-phase transformer both end voltage direction, When A phase transformer Same Name of Ends voltage be timing A be+, when A phase transformer Same Name of Ends voltage is negative A be-, when A phase transformer two Hold voltage when being zero A be 0, when B phase transformer Same Name of Ends voltage be timing B be+, the B when B phase transformer Same Name of Ends voltage is negative For-, when B phase transformer both end voltage is zero, B is 0, when C phase transformer Same Name of Ends voltage be timing C be+, when C phase transformer When Same Name of Ends voltage is negative C be-, when C phase transformer both end voltage is zero, C is 0；
Distinguish two switching tubes of each two-way switch of control exchange side:
S in step 1a、Sb、ScRespectively represent 18 switching tube Q in exchange side three-phase bridge armA1~6、QB1~6、QC1~6Open Off status, each two-way switch for exchanging side includes two connected switching tubes, works as Qi1S when conductingiIt is -1+, work as Qi2When conducting SiIt is -1-, work as Qi3S when conductingiIt is 0+, work as Qi4S when conductingiIt is 0-, work as Qi5S when conductingiIt is 1+, work as Qi6S when conductingiIt is 1-, when QI1~6S when being all not turned oniFor x, wherein i=a, b, c divide table to represent A phase, B phase, C phase；Sd、Se、SfRespectively represent DC side bridge Six switching tube Q of arms1,2、Qs3,4、Qs5,6Switch state, as switching tube Qs1S when conductingd=1, as switching tube Qs2When conducting Sd=0, as switching tube Qs1、Qs2S when being all not turned ond=x, as switching tube Qs3S when conductinge=1, as switching tube Qs4S when conductinge= 0, as switching tube Qs3、Qs4S when being all not turned one=x, as switching tube Qs5S when conductingf=1, as switching tube Qs6S when conductingf=0, when Switching tube Qs5、Qs6S when being all not turned onf=x also can choose when work is in rectification mode and not control DC side switching tube；A, B, C respectively represents A, B, C three-phase transformer both end voltage direction, when A phase transformer Same Name of Ends voltage be timing A be+, when A phase When transformer Same Name of Ends voltage is negative A be-, when A phase transformer both end voltage is zero, A is 0, when B phase transformer Same Name of Ends electricity Pressure be timing B be+, when B phase transformer Same Name of Ends voltage is negative B for-, when B phase transformer both end voltage is zero, B is 0, when C phase transformer Same Name of Ends voltage be timing C be+, when C phase transformer Same Name of Ends voltage is negative C be-, when C phase transformer both ends C is 0 when voltage is zero；
In step 2, Space current vector synthesized by the switch state of all various combinations is formed into hexagon, six side Shape includes 6 non-zero current vectors, zero current vector, and entire hexagon is divided into 6 fans by 6 non-zero current direction vectors Area；Non-zero current vector sum zero current vector is defined as fundamental current vector；
The detailed process of step 3 is:
Step 3.1, respectively select non-zero current vector corresponding on two fundamental current direction vectors of each sector borders 3 switch states and corresponding 3 switch states of zero current vector totally 9 switch states, 9 switch states are divided into three Group, every group includes each 1 switch state and the corresponding 1 switch shape of zero current vector on two fundamental current direction vectors State, the resultant action time of every group of three switch states are one third switch periods；
Step 3.2, the action time of the corresponding fundamental current vector of every group of three switch states is obtained respectively；
Step 3.3, according to the principle of the principle of Vector modulation and transformer voltage-second balance obtain each switch state when Between relation equation group between the action time of fundamental current vector；
Step 3.4, Xie Shangshu equation group obtains each switch state corresponding time.
Using above-mentioned converter, the isolating transformer include three transformers, each transformer include primary side winding and Vice-side winding, the connection type used between three transformers connect for star-like connection or triangle, and wherein star-like connection is three The winding different name end of a transformer is connected and three ports of the Same Name of Ends as external connection, triangle are connected as adjacent transformers The Same Name of Ends of winding is connected three ports as external connection with different name end.
Using above-mentioned converter, exchanging each two-way switch in side includes two connected switching tubes and two diodes, In the emitters of two switching tubes be connected, the Inductor of a collector of the two switching tubes connection exchange side circuitry phase And the corresponding external connection port of another collector connection isolating transformer primary side winding, alternatively, the current collection of two switching tubes Extremely it is connected, the Inductor and another emitter of the emitter connection exchange side circuitry phase of two switching tubes connect The corresponding external connection port of isolating transformer primary side winding, the anode of each diode are connected with the emitter of corresponding switching tube And cathode is connect with collector.
Using above-mentioned converter, DC side includes three bridge arms, and each bridge arm includes two concatenated switching tubes, wherein one The port of the emitter of a switching tube external connection corresponding with isolating transformer vice-side winding connects and collector and DC side Positive terminal after energy storage inductor connection as DC side, the collector of another switching tube are corresponding with isolating transformer vice-side winding External connection port connection and negative pole end of the emitter as DC side.
Using above-mentioned converter, one DC side filter capacitor of DC side both ends parallel connection.
Realize the technical solution two of the object of the invention are as follows: a kind of two-way AC/DC converter of current mode single-stage isolated three-phase and Its modulation strategy, which is characterized in that including exchange lateral circuit, isolating transformer and direct current lateral circuit, exchange lateral circuit includes handing over Side filter inductance, exchange side filter capacitor, exchange side three-phase bridge arm are flowed, DC side includes DC side bridge arm, DC side energy storage electricity Sense and DC side filter capacitor, isolating transformer are made of three transformers；The bridge arm of the exchange every one-phase circuit in side includes upper double To switch, middle two-way switch, lower two-way switch, exchange the upper two-way switch of the bridge arm of the every one-phase circuit in side, middle two-way switch, under The connected one end of two-way switch connects to one end of corresponding filter inductance respectively and connect with one end of corresponding filter capacitor, exchanges Upper two-way switch, middle two-way switch, the other end of lower two-way switch of the bridge arm of the every one-phase circuit in side are opposite with other two respectively The other end for the two-way switch answered, which is connected, constitutes three points of common connection, then three with isolating transformer primary side winding respectively The port of corresponding external connection is connected, exchange the other ends of three filter inductances of side respectively with exchange side power supply and (rectifies or simultaneously Net inversion) or threephase load connection (independent inversion), it exchanges and is connected between three filter capacitor other ends of side；DC side Each bridge arm be composed in series by a switching tube and an energy storage inductor and the midpoint of each bridge arm respectively with isolating transformer The port of the corresponding external connection of vice-side winding is connected, three bridge arm parallel connections, and bridge arm one end is connecting DC side filter capacitor just End, the bridge arm other end connect the negative terminal of DC side filter capacitor.
A kind of space vector control method for above-mentioned converter, comprising the following steps:
Step 1, it usesFormat define switch state；
Step 2, Space current vector synthesized by the switch state of all various combinations is formed into hexagon, will entirely put down Face is divided into 6 sectors；
Step 3, to carry out Vector modulation according to the sector of division minimum according to switch state switching times and guarantee three The principle of transformer voltage-second balance determines switch state switch sequence and obtains the time of each switch state；
Exchange side three-phase bridge arm is made of 18 switching tubes, and every phase bridge arm in three-phase bridge arm is opened by six respectively Guan Zucheng is closed, wherein
A phase bridge arm includes the first to the 6th switching tube, and B phase bridge arm includes the 7th to the 12nd switching tube, and C phase bridge arm includes 13rd to eighteenmo close manage；The emitter of first switch tube is connected as the upper double of A phase with the emitter of second switch To switch, the middle two-way switch that the emitter of third switching tube is connected with the emitter of the 4th switching tube as A phase, the 5th switch The lower two-way switch that the emitter of pipe is connected with the emitter of the 6th switching tube as A phase, the collector of second switch and The collector of three switching tubes, the collector of the 5th switching tube are connected, the transmitting of the emitter and the 8th switching tube of the 7th switching tube The upper two-way switch being extremely connected as B phase, the emitter of the 9th switching tube are connected with the emitter of the tenth switching tube as B phase Middle two-way switch, the lower two-way switch that the emitter of the 11st switching tube is connected with the emitter of the 12nd switching tube as B phase, The collector of 8th switching tube is connected with the collector of the collector of the 9th switching tube, the 11st switching tube, the 13rd switching tube The upper two-way switch that is connected with the emitter of the 14th switching tube as C phase of emitter, the emitter of the 15th switching tube with Sixteenmo closes the middle two-way switch that the emitter of pipe is connected as C phase, and the emitter and eighteenmo of the 17th switching tube close The emitter of pipe is connected the lower two-way switch as C phase, the collector of the collector of the 14th switching tube and the 15th switching tube, The collector of 17th switching tube is connected, collector, the 13rd switching tube of the collector of first switch tube and the 7th switching tube Collector be connected as a port for connecting transformer, the collector of the collector of the 4th switching tube and the tenth switching tube, Sixteenmo closes a port that the collector of pipe is connected as connection transformer, and the collector of the 6th switching tube is opened with the 12nd Close the collector of pipe, eighteenmo closes a port that the collector of pipe is connected as connection transformer；The DC side bridge arm It is made of three switching tubes and three energy storage inductors, wherein energy storage inductor Lf1It is connected with collector one end of the 19th switching tube, Energy storage inductor Lf2It is connected with collector one end of the 20th switching tube, energy storage inductor Lf3With the collector of the 21st switching tube One end is connected, energy storage inductor Lf1The other end and energy storage inductor Lf2The other end, energy storage inductor Lf3The other end be connected, connection The anode of DC side filter capacitor, the emitter of the 19th switching tube and emitter, the 21st switch of the 20th switching tube The emitter of pipe is connected, and connects the negative terminal of DC side filter capacitor；
Do not distinguish two switching tubes of each two-way switch of control exchange side:
S in step 1a、Sb、ScRespectively represent 18 switching tube Q in exchange side three-phase bridge armA1~6、QB1~6、QC1~6Open Off status, each two-way switch for exchanging side includes two connected switching tubes, works as Qi1Or Qi2S when conductingiIt is -1, works as Qi3Or Qi4S when conductingiIt is 0, works as Qi5Or Qi6S when conductingiIt is 1, works as QI1~6When being all not turned on, SiFor x, wherein i=a, b, c divide table generation Table A phase, B phase, C phase；Sd、Se、SfRespectively represent three switching tube Q of DC side bridge arms1、Qs2、Qs3Switch state, work as switch Pipe Qs1S when conductingd=1, as switching tube Qs1S when being not turned ond=0, as switching tube Qs2S when conductinge=1, as switching tube Qs2It does not lead S when logicale=0, as switching tube Qs3S when conductingf=1, as switching tube Qs3S when being not turned onf=0, when work is in rectification mode It can choose and do not control DC side switching tube；A, B, C respectively represent A, B, C three-phase transformer both end voltage direction, when A phase-change pressure Device Same Name of Ends voltage be timing A be+, when A phase transformer Same Name of Ends voltage is negative A be-, when A phase transformer both end voltage is When zero A be 0, when B phase transformer Same Name of Ends voltage be timing B be+, when B phase transformer Same Name of Ends voltage is negative B be-, work as B B is 0 when phase transformer both end voltage is zero, when C phase transformer Same Name of Ends voltage be timing C be+, when C phase transformer Same Name of Ends When voltage is negative C be-, when C phase transformer both end voltage is zero, C is 0；
In step 2, Space current vector synthesized by the switch state of all various combinations is formed into hexagon, six side Shape includes 6 non-zero current vectors, zero current vector, and entire hexagon is divided into 6 fans by 6 non-zero current direction vectors Area；Non-zero current vector sum zero current vector is defined as fundamental current vector；
The detailed process of step 3 is:
Step 3.1, respectively select non-zero current vector corresponding on two fundamental current direction vectors of each sector borders 3 switch states and corresponding 3 switch states of zero current vector totally 9 switch states, 9 switch states are divided into three Group, every group includes each 1 switch state and the corresponding 1 switch shape of zero current vector on two fundamental current direction vectors State, the resultant action time of every group of three switch states are one third switch periods；
Step 3.2, the action time of the corresponding fundamental current vector of every group of three switch states is obtained respectively；
Step 3.3, according to the principle of the principle of Vector modulation and transformer voltage-second balance obtain each switch state when Between relation equation group between the action time of fundamental current vector；
Step 3.4, Xie Shangshu equation group obtains each switch state corresponding time.
Using above-mentioned converter, the isolating transformer include three transformers, each transformer include primary side winding and Vice-side winding, the connection type used between three transformers connect for star-like connection or triangle, and wherein star-like connection is three The winding different name end of a transformer is connected and three ports of the Same Name of Ends as external connection, triangle are connected as adjacent transformers The Same Name of Ends of winding is connected three ports as external connection with different name end.
Using above-mentioned converter, exchanging each two-way switch in side includes two connected switching tubes and two diodes, In the emitters of two switching tubes be connected, the Inductor of a collector of the two switching tubes connection exchange side circuitry phase And the corresponding external connection port of another collector connection isolating transformer primary side winding, alternatively, the current collection of two switching tubes Extremely it is connected, the Inductor and another emitter of the emitter connection exchange side circuitry phase of two switching tubes connect The corresponding external connection port of isolating transformer primary side winding, the anode of each diode are connected with the emitter of corresponding switching tube And cathode is connect with collector.
Using above-mentioned converter, DC side includes three bridge arms, and three bridge arm parallel connections, each bridge arm includes an energy storage electricity Sense is connected with a switching tube, and wherein the port of energy storage inductor one end external connection corresponding with isolating transformer vice-side winding connects It connects and positive terminal of the other end as DC side, the collector of switching tube external connection corresponding with isolating transformer vice-side winding Port connection and negative pole end of the emitter as DC side.
Using above-mentioned converter, one DC side filter capacitor of DC side both ends parallel connection.
Isolating transformer in the two-way AC/DC converter of current mode single-stage isolated three-phase of the present invention and its modulation strategy With buck and electrical isolation dual function, three-phase alternating current side voltage passes through exchange side LC filter, exchange side three-phase bridge arm It is transformed to the single-phase AC voltage at each transformer both ends, then is transformed to by the isolation of isolating transformer and DC side bridge arm DC voltage, can reduce the voltage and current stress of transformer, while can reduce the current stress of switching tube, reduce DC side current ripples.Meanwhile the present invention solve in the prior art isolated form three-phase AC/DC converter handle it is high-power when The problem that existing switching tube current stress is excessive, single transformer processing power is excessive and DC side current ripples are excessive.
The invention will be further described with reference to the accompanying drawings of the specification.
Detailed description of the invention
Fig. 1 is the two-way AC/DC converter of current mode single-stage isolated three-phase of the present invention and its modulation strategy circuit structure Schematic diagram (primary side star-pair side triangle connection).
Fig. 2 is the two-way AC/DC converter of current mode single-stage isolated three-phase of the present invention and its modulation strategy circuit structure Schematic diagram (primary side star-pair side star-like connection).
Fig. 3 is the two-way AC/DC converter of current mode single-stage isolated three-phase of the present invention and its modulation strategy circuit structure Schematic diagram (primary side triangle-pair side star-like connection).
Fig. 4 is the two-way AC/DC converter of current mode single-stage isolated three-phase of the present invention and its modulation strategy circuit structure Schematic diagram (primary side triangle-pair side triangle connection).
Fig. 5 is the two-way AC/DC converter of current mode single-stage isolated three-phase of the present invention and its modulation strategy circuit structure Schematic diagram (primary side star-pair side triangle connection, secondary side are three times stream rectification type).
Fig. 6 is the two-way AC/DC converter of current mode single-stage isolated three-phase of the present invention and its modulation strategy control block diagram.
Fig. 7 is the two-way AC/DC converter of current mode single-stage isolated three-phase of the present invention and its modulation strategy in ia>0、ib< 0、icFundamental current three dimensional vector diagram in < 0 electric current section.
Fig. 8 is the two-way AC/DC converter of current mode single-stage isolated three-phase of the present invention and its modulation strategy in ia>0、ib> 0、icFundamental current three dimensional vector diagram in < 0 electric current section.
Fig. 9 is the basic arrow of the two-way AC/DC converter of current mode single-stage isolated three-phase of the present invention and its modulation strategy Spirogram.
Figure 10 is that the two-way AC/DC converter of current mode single-stage isolated three-phase of the present invention and its modulation strategy do not distinguish control Two switching tubes of each two-way switch of system exchange side are in ia>0、ib<0、ic< 0 and ia>0、ib>0、icIn < 0 electric current section Switching tube drive waveforms figure.
Figure 11 is that the two-way AC/DC converter of current mode single-stage isolated three-phase of the present invention and its modulation strategy distinguish control Two switching tubes of each two-way switch of side are exchanged in ia>0、ib<0、ic< 0 and ia>0、ib>0、icOpening in < 0 electric current section Close pipe drive waveforms figure.
Specific embodiment
In conjunction with FIG. 1 to FIG. 4, a kind of two-way AC/DC converter of current mode single-stage isolated three-phase and its modulation strategy, including hand over Flow side LC filter 1, exchange side three-phase bridge arm 2, isolating transformer 3, DC side bridge arm 4, DC side energy storage inductor 5, DC side Filter capacitor 6.Exchanging side LC filter 1 includes A phase inductance La, B phase inductance Lb, C phase inductance Lc, A phase capacitor Ca, B phase capacitor Cb, C phase capacitor Cc, exchange side three-phase bridge arm 2 includes first switch tube Qa2, second switch Qa1, third switching tube Qa3, the 4th switch Pipe Qa4, the 5th switching tube Qa5, the 6th switching tube Qa6, the 7th switching tube Qb2, the 8th switching tube Qb1, the 9th switching tube Qb3, the tenth Switching tube Qb4, the 11st switching tube Qb5, the 12nd switching tube Qb6, the 13rd switching tube Qc2, the 14th switching tube Qc1, the 15th Switching tube Qc3, sixteenmo close pipe Qc4, the 17th switching tube Qc5, eighteenmo close pipe Qc6。Qa1By a single-way switch pipe and Diode Da1It is formed in parallel, Qa2By a single-way switch pipe and diode Da2It is formed in parallel, Qa3By a single-way switch pipe and two Pole pipe Da3It is formed in parallel, Qa4By a single-way switch pipe and diode Da4It is formed in parallel, Qa5By a single-way switch pipe and two poles Pipe Da5It is formed in parallel, Qa6By a single-way switch pipe and diode Da6It is formed in parallel.Qb1By a single-way switch pipe and diode Db1It is formed in parallel, Qb2By a single-way switch pipe and diode Db2It is formed in parallel, Qb3By a single-way switch pipe and diode Db3It is formed in parallel, Qb4By a single-way switch pipe and diode Db4It is formed in parallel, Qb5By a single-way switch pipe and diode Db5It is formed in parallel, Qb6By a single-way switch pipe and diode Db6It is formed in parallel.Qc1By a single-way switch pipe and diode Dc1It is formed in parallel, Qc2By a single-way switch pipe and diode Dc2It is formed in parallel, Qc3By a single-way switch pipe and diode Dc3It is formed in parallel, Qc4By a single-way switch pipe and diode Dc4It is formed in parallel, Qc5By a single-way switch pipe and diode Dc5It is formed in parallel, Qc6By a single-way switch pipe and diode Dc6It is formed in parallel.Da1、Da2、Da3、Da4、Da5、Da6、Db1、Db2、 Db3、Db4、Db5、Db6、Dc1、Dc2、Dc3、Dc4、Dc5、Dc6The anti-and diode that can be IGBT is also possible to the parasitism two of MOSFET Pole pipe, when switching frequency is lower using common rectifier diode, when switching frequency is higher, using fast recovery diode Or Schottky diode.
Specifically, every phase bridge arm in three-phase bridge arm is made of six switching tubes respectively.First switch tube Qa2Emitter With second switch Qa1Emitter be connected upper two-way switch as A phase, third switching tube Qa3Emitter and the 4th switch Pipe Qa4Emitter be connected middle two-way switch as A phase, the 5th switching tube Qa5Emitter and the 6th switching tube Qa6Transmitting The lower two-way switch being extremely connected as A phase, second switch Qa1Collector and third switching tube Qa3Collector, the 5th open Close pipe Qa5Collector be connected；7th switching tube Qb2Emitter and the 8th switching tube Qb1Emitter be connected as the upper of B phase Two-way switch, the 9th switching tube Qb3Emitter and the tenth switching tube Qb4Emitter be connected middle two-way switch as B phase, 11st switching tube Qb5Emitter and the 12nd switching tube Qb6Emitter be connected lower two-way switch as B phase, the 8th opens Close pipe Qb1Collector and the 9th switching tube Qb3Collector, the 11st switching tube Qb5Collector be connected；13rd switching tube Qc2Emitter and the 14th switching tube Qc1Emitter be connected upper two-way switch as C phase, the 15th switching tube Qc3Hair Emitter-base bandgap grading and sixteenmo close pipe Qc4Emitter be connected middle two-way switch as C phase, the 17th switching tube Qc5Emitter with Eighteenmo closes pipe Qc6Emitter be connected lower two-way switch as C phase, the 14th switching tube Qc1Collector and the 15th Switching tube Qc3Collector, the 17th switching tube Qc5Collector be connected.First switch tube Qa2Collector and the 7th switching tube Qb2Collector, the 13rd switching tube Qc2Collector be connected as connect transformer a port, the 4th switching tube Qa4's Collector and the tenth switching tube Qb4Collector, sixteenmo close pipe Qc4Collector be connected as connecting one of transformer Port, the 6th switching tube Qa6Collector and the 12nd switching tube Qb6Collector, eighteenmo close pipe Qc6Collector be connected A port as connection transformer.
The primary side winding of the isolating transformer is by three transformer Tra、Trb、TrcIt constitutes, the former vice-side winding of transformer There are two types of connection types: star-like connection is connected with triangle.Wherein star-like connection mode refers to transformer Tra、Trb、TrcAround Group different name end is connected, and three ports of the Same Name of Ends as isolating transformer external connection.Triangle connection refers to transformer Tra Motor Winding Same Name of Ends and transformer TrbDifferent name end be connected a port as external connection, transformer TrbSame Name of Ends with Transformer TrcDifferent name end be connected second port as external connection, transformer TrcSame Name of Ends and transformer TraIt is different The third port that name end is connected as external connection.There are four types of combinations for isolating transformer: primary side star-pair side triangle Connection, primary side star-pair star-like connection and primary side triangle-pair side triangle in star-like connection, primary side triangle-pair connect It connects.
The DC side bridge arm is made of six switching tubes, including the 19th switching tube Qs1, the 20th switching tube Qs2, 21 switching tube Qs3, the 22nd switching tube Qs4, the 23rd switching tube Qs5, the 24th switching tube Qs6.Wherein the 19th Switching tube Qs1Emitter and the 20th switching tube Qs2Collector be connected, the 21st switching tube Qs3Emitter and second 12 switching tube Qs4Collector be connected, the 23rd switching tube Qs5Emitter and the 24th switching tube Qs6Collector It is connected.19th switching tube Qs1Collector and the 21st switching tube Qs3Collector, the 23rd switching tube Qs5Current collection Extremely it is connected, the 20th switching tube Qs2Emitter and the 22nd switching tube Qs4Emitter, the 24th switching tube Qs6Hair Emitter-base bandgap grading is connected.Qs1By a single-way switch pipe and diode Ds1It is formed in parallel, Qs2By a single-way switch pipe and diode Ds2And Join, Qs3By a single-way switch pipe and diode Ds3It is formed in parallel, Qs4By a single-way switch pipe and diode Ds4It is in parallel It forms, Qs5By a single-way switch pipe and diode Ds5It is formed in parallel, Qs6By a single-way switch pipe and diode Ds6It is in parallel and At the emitter of single-way switch pipe is connected with the anode of diode when in parallel, and collector is connected with the cathode of diode.Ds1、 Ds2、Ds3、Ds4、Ds5、Ds6The anti-and diode that can be IGBT, is also possible to the parasitic diode of MOSFET, works as switching frequency When lower, using common rectifier diode；When switching frequency is higher, using two pole of fast recovery diode or Schottky Pipe.
Fig. 5 is the circuit basic structure of the two-way AC/DC converter of the current mode single-stage isolated three-phase and its modulation strategy Schematic diagram, by exchange side LC filter 1, exchange side three-phase bridge arm 2, isolating transformer 3, DC side bridge arm 4, DC side filtered electrical Hold 5 compositions.Exchanging side LC filter 1 includes A phase inductance La, B phase inductance Lb, C phase inductance Lc, A phase capacitor Ca, B phase capacitor Cb, C Phase capacitor Cc, exchange side three-phase bridge arm 2 includes first switch tube Qa2, second switch Qa1, third switching tube Qa3, the 4th switch Pipe Qa4, the 5th switching tube Qa5, the 6th switching tube Qa6, the 7th switching tube Qb2, the 8th switching tube Qb1, the 9th switching tube Qb3, the tenth Switching tube Qb4, the 11st switching tube Qb5, the 12nd switching tube Qb6, the 13rd switching tube Qc2, the 14th switching tube Qc1, the 15th Switching tube Qc3, sixteenmo close pipe Qc4, the 17th switching tube Qc5, eighteenmo close pipe Qc6。Qa1By a single-way switch pipe and Diode Da1It is formed in parallel, Qa2By a single-way switch pipe and diode Da2It is formed in parallel, Qa3By a single-way switch pipe and two Pole pipe Da3It is formed in parallel, Qa4By a single-way switch pipe and diode Da4It is formed in parallel, Qa5By a single-way switch pipe and two poles Pipe Da5It is formed in parallel, Qa6By a single-way switch pipe and diode Da6It is formed in parallel.Qb1By a single-way switch pipe and diode Db1It is formed in parallel, Qb2By a single-way switch pipe and diode Db2It is formed in parallel, Qb3By a single-way switch pipe and diode Db3It is formed in parallel, Qb4By a single-way switch pipe and diode Db4It is formed in parallel, Qb5By a single-way switch pipe and diode Db5It is formed in parallel, Qb6By a single-way switch pipe and diode Db6It is formed in parallel.Qc1By a single-way switch pipe and diode Dc1It is formed in parallel, Qc2By a single-way switch pipe and diode Dc2It is formed in parallel, Qc3By a single-way switch pipe and diode Dc3It is formed in parallel, Qc4By a single-way switch pipe and diode Dc4It is formed in parallel, Qc5By a single-way switch pipe and diode Dc5It is formed in parallel, Qc6By a single-way switch pipe and diode Dc6It is formed in parallel.Da1、Da2、Da3、Da4、Da5、Da6、Db1、Db2、 Db3、Db4、Db5、Db6、Dc1、Dc2、Dc3、Dc4、Dc5、Dc6The anti-and diode that can be IGBT is also possible to the parasitism two of MOSFET Pole pipe, when switching frequency is lower using common rectifier diode, when switching frequency is higher, using fast recovery diode Or Schottky diode.
Specifically, every phase bridge arm in three-phase bridge arm is made of six switching tubes respectively.First switch tube Qa2Emitter With second switch Qa1Emitter be connected upper two-way switch as A phase, third switching tube Qa3Emitter and the 4th switch Pipe Qa4Emitter be connected middle two-way switch as A phase, the 5th switching tube Qa5Emitter and the 6th switching tube Qa6Transmitting The lower two-way switch being extremely connected as A phase, second switch Qa1Collector and third switching tube Qa3Collector, the 5th open Close pipe Qa5Collector be connected；7th switching tube Qb2Emitter and the 8th switching tube Qb1Emitter be connected as the upper of B phase Two-way switch, the 9th switching tube Qb3Emitter and the tenth switching tube Qb4Emitter be connected middle two-way switch as B phase, 11st switching tube Qb5Emitter and the 12nd switching tube Qb6Emitter be connected lower two-way switch as B phase, the 8th opens Close pipe Qb1Collector and the 9th switching tube Qb3Collector, the 11st switching tube Qb5Collector be connected；13rd switching tube Qc2Emitter and the 14th switching tube Qc1Emitter be connected upper two-way switch as C phase, the 15th switching tube Qc3Hair Emitter-base bandgap grading and sixteenmo close pipe Qc4Emitter be connected middle two-way switch as C phase, the 17th switching tube Qc5Emitter with Eighteenmo closes pipe Qc6Emitter be connected lower two-way switch as C phase, the 14th switching tube Qc1Collector and the 15th Switching tube Qc3Collector, the 17th switching tube Qc5Collector be connected.First switch tube Qa2Collector and the 7th switching tube Qb2Collector, the 13rd switching tube Qc2Collector be connected as connect transformer a port, the 4th switching tube Qa4's Collector and the tenth switching tube Qb4Collector, sixteenmo close pipe Qc4Collector be connected as connecting one of transformer Port, the 6th switching tube Qa6Collector and the 12nd switching tube Qb6Collector, eighteenmo close pipe Qc6Collector be connected A port as connection transformer.
The primary side winding of the isolating transformer is by three transformer Tra、Trb、TrcIt constitutes, the former vice-side winding of transformer There are two types of connection types: star-like connection is connected with triangle.Wherein star-like connection mode refers to transformer Tra、Trb、TrcAround Group different name end is connected, and three ports of the Same Name of Ends as isolating transformer external connection.Triangle connection refers to transformer Tra Motor Winding Same Name of Ends and transformer TrbDifferent name end be connected a port as external connection, transformer TrbSame Name of Ends with Transformer TrcDifferent name end be connected second port as external connection, transformer TrcSame Name of Ends and transformer TraIt is different The third port that name end is connected as external connection.There are four types of combinations for isolating transformer: primary side star-pair side triangle Connection, primary side star-pair star-like connection and primary side triangle-pair side triangle in star-like connection, primary side triangle-pair connect It connects.
The DC side bridge arm is made of three energy storage inductors and three switching tubes, including energy storage inductor Lf1, energy storage inductor Lf2, energy storage inductor Lf3, the 19th switching tube Qs1, the 20th switching tube Qs2, the 21st switching tube Qs3.Wherein energy storage inductor Lf1 One end and the 19th switching tube Qs1Collector be connected, energy storage inductor Lf2One end and the 20th switching tube Qs2Collector be connected, Energy storage inductor Lf3One end and the 21st switching tube Qs3Collector be connected.Energy storage inductor Lf1The other end and energy storage inductor Lf2 The other end, energy storage inductor Lf3The other end be connected, the 19th switching tube Qs1Emitter and the 20th switching tube Qs2Transmitting Pole, the 21st switching tube Qs3Emitter be connected.Qs1By a single-way switch pipe and diode Ds1It is formed in parallel, Qs2By one A single-way switch pipe and diode Ds2It is formed in parallel, Qs3By a single-way switch pipe and diode Ds3It is formed in parallel, it is single when in parallel The anode of emitter and diode to switching tube is connected, and collector is connected with the cathode of diode.Ds1、Ds2、Ds3It can be The anti-and diode of IGBT, is also possible to the parasitic diode of MOSFET, when switching frequency is lower, using common rectification two Pole pipe；When switching frequency is higher, using fast recovery diode or Schottky diode.
The company of the two-way AC/DC converter of the three-phase of current mode single-stage isolated described in Fig. 1 and its modulation strategy isolating transformer Connecing mode is primary side star-pair side triangle connection.Exchanging side LC filter 1 includes three inductance La、Lb、Lc, three capacitors Ca、Cb、Cc, inductance La、Lb、LcOne end and capacitor Ca、Cb、CcOne end meet second switch Q respectivelya1Collector is opened with third Close pipe Qa3Collector and the 5th switching tube Qa5The tie point of collector, the 8th switching tube Qb1Collector and the 9th switching tube Qb3 Collector and the 11st switching tube Qb5The tie point of collector, the 14th switching tube Qc1Collector and the 15th switching tube Qc3 Collector and the 17th switching tube Qc5The tie point of collector.Inductance La、Lb、LcThe other end respectively with to exchange side power supply (whole Stream or parallel network reverse) or threephase load connection (independent inversion).Capacitor Ca、Cb、CcThe other end be connected together.Isolation becomes A phase transformer primary side winding A in depressor 3pTermination first switch tube Q of the same namea2Collector and the 7th switching tube Qb2Collector with And the 13rd switching tube Qc2The tie point of collector；B phase transformer primary side winding Bp4th switching tube Q of termination of the same namea4Current collection Pole and the tenth switching tube Qb4Collector and sixteenmo close pipe Qc4The tie point of collector；C phase transformer primary side winding Cp's 6th switching tube Q of termination of the same namea6Collector and the 12nd switching tube Qb6Collector and eighteenmo close pipe Qc6The company of collector Contact.A phase transformer primary side winding ApDifferent name end and B phase transformer primary side winding BpDifferent name end and C phase transformer primary side Winding CpDifferent name end connection.A phase transformer vice-side winding AsSame Name of Ends and B phase transformer vice-side winding BsDifferent name end phase Even, then with the 19th switching tube Qs1Emitter and the 20th switching tube Qs2Collector tie point be connected；B phase transformer Vice-side winding BsSame Name of Ends and C phase transformer vice-side winding CsDifferent name end be connected, then with the 21st switching tube Qs3Hair Emitter-base bandgap grading and the 22nd switching tube Qs4Collector tie point be connected；C phase transformer vice-side winding CsSame Name of Ends and A phase transformation Depressor vice-side winding AsDifferent name end be connected, then with the 23rd switching tube Qs5Emitter and the 24th switching tube Qs6Collection The tie point of electrode is connected.One end of DC side energy storage inductor 5 and the 19th switching tube Qs1Collector, the 21st switching tube Qs3Collector and the 23rd switching tube Qs5Collector tie point be connected；The other end and DC side filter capacitor 6 Anode is connected.6 negative terminal of DC side filter capacitor and the 20th switching tube Qs2Emitter and the 22nd switching tube Qs4Transmitting Pole and the 24th switching tube Qs6Emitter tie point be connected.
The company of the two-way AC/DC converter of the three-phase of current mode single-stage isolated described in Fig. 2 and its modulation strategy isolating transformer Connecing mode is primary side star-pair side star-like connection.Exchanging side LC filter 1 includes three inductance La、Lb、Lc, three capacitor Ca、 Cb、Cc, inductance La、Lb、LcOne end and capacitor Ca、Cb、CcOne end meet second switch Q respectivelya1Collector and third switch Pipe Qa3Collector and the 5th switching tube Qa5The tie point of collector, the 8th switching tube Qb1Collector and the 9th switching tube Qb3Collection Electrode and the 11st switching tube Qb5The tie point of collector, the 14th switching tube Qc1Collector and the 15th switching tube Qc3Collection Electrode and the 17th switching tube Qc5The tie point of collector.Inductance La、Lb、LcThe other end respectively with exchange side power supply (rectification Or parallel network reverse) or threephase load connection (independent inversion).Capacitor Ca、Cb、CcThe other end be connected together.Transformation is isolated A phase transformer primary side winding A in device 3pTermination first switch tube Q of the same namea2Collector and the 7th switching tube Qb2Collector and 13rd switching tube Qc2The tie point of collector；B phase transformer primary side winding Bp4th switching tube Q of termination of the same namea4Collector With the tenth switching tube Qb4Collector and sixteenmo close pipe Qc4The tie point of collector；C phase transformer primary side winding CpIt is same The 6th switching tube Q of name terminationa6Collector and the 12nd switching tube Qb6Collector and eighteenmo close pipe Qc6The connection of collector Point.A phase transformer primary side winding ApDifferent name end and B phase transformer primary side winding BpDifferent name end and C phase transformer primary side around Group CpDifferent name end connection.A phase transformer vice-side winding AsSame Name of Ends and the 19th switching tube Qs1Emitter and the 20th Switching tube Qs2Collector tie point be connected；B phase transformer vice-side winding BsSame Name of Ends and the 21st switching tube Qs3's Emitter and the 22nd switching tube Qs4Collector tie point be connected；C phase transformer vice-side winding CsSame Name of Ends and 23 switching tube Qs5Emitter and the 24th switching tube Qs6Collector tie point be connected.The phase transformer pair side A around Group AsDifferent name end and B phase transformer vice-side winding BsDifferent name end and C phase transformer vice-side winding CsDifferent name end connection. One end of DC side energy storage inductor 5 and the 19th switching tube Qs1Collector, the 21st switching tube Qs3Collector and 23 switching tube Qs5Collector tie point be connected；The other end is connected with the anode of DC side filter capacitor 6.DC side filter 6 negative terminal of wave capacitor and the 20th switching tube Qs2Emitter and the 22nd switching tube Qs4Emitter and 24-carat gold Close pipe Qs6Emitter tie point be connected.
The company of the two-way AC/DC converter of the three-phase of current mode single-stage isolated described in Fig. 3 and its modulation strategy isolating transformer Connecing mode is primary side triangle-pair side star-like connection.Exchanging side LC filter 1 includes three inductance La、Lb、Lc, three capacitors Ca、Cb、Cc, inductance La、Lb、LcOne end and capacitor Ca、Cb、CcOne end meet second switch Q respectivelya1Collector is opened with third Close pipe Qa3Collector and the 5th switching tube Qa5The tie point of collector, the 8th switching tube Qb1Collector and the 9th switching tube Qb3 Collector and the 11st switching tube Qb5The tie point of collector, the 14th switching tube Qc1Collector and the 15th switching tube Qc3 Collector and the 17th switching tube Qc5The tie point of collector.Inductance La、Lb、LcThe other end respectively with to exchange side power supply (whole Stream or parallel network reverse) or threephase load connection (independent inversion).Capacitor Ca、Cb、CcThe other end be connected together.Isolation becomes A phase transformer primary side winding A in depressor 3pSame Name of Ends and C phase transformer primary side winding CpDifferent name end be connected, then opened with first Close pipe Qa2Collector and the 7th switching tube Qb2Collector and the 13rd switching tube Qc2The tie point of collector is connected；B phase-change pressure Device primary side winding BpSame Name of Ends and A phase transformer primary side winding ApDifferent name end be connected, then with the 4th switching tube Qa4Collector With the tenth switching tube Qb4Collector and sixteenmo close pipe Qc4The tie point of collector is connected；C phase transformer primary side winding Cp Same Name of Ends and B phase transformer primary side winding BpDifferent name end be connected, then with the 6th switching tube Qa6Collector and the 12nd switch Pipe Qb6Collector and eighteenmo close pipe Qc6The tie point of collector is connected.A phase transformer vice-side winding AsSame Name of Ends with 19th switching tube Qs1Emitter and the 20th switching tube Qs2Collector tie point be connected；B phase transformer vice-side winding BsSame Name of Ends and the 21st switching tube Qs3Emitter and the 22nd switching tube Qs4Collector tie point be connected；C Phase transformer vice-side winding CsSame Name of Ends and the 23rd switching tube Qs5Emitter and the 24th switching tube Qs6Current collection The tie point of pole is connected；A phase transformer vice-side winding AsDifferent name end and B phase transformer vice-side winding BsDifferent name end and C phase Transformer secondary winding CsDifferent name end connection.One end of DC side energy storage inductor 5 and the 19th switching tube Qs1Collector, 21 switching tube Qs3Collector and the 23rd switching tube Qs5Collector tie point be connected；The other end and direct current The anode of side filter capacitor 6 is connected.6 negative terminal of DC side filter capacitor and the 20th switching tube Qs2Emitter opened with the 22nd Close pipe Qs4Emitter and the 24th switching tube Qs6Emitter tie point be connected.
The company of the two-way AC/DC converter of the three-phase of current mode single-stage isolated described in Fig. 4 and its modulation strategy isolating transformer Connecing mode is primary side triangle-pair side triangle connection.Exchanging side LC filter 1 includes three inductance La、Lb、Lc, three capacitors Ca、Cb、Cc, inductance La、Lb、LcOne end and capacitor Ca、Cb、CcOne end meet second switch Q respectivelya1Collector is opened with third Close pipe Qa3Collector and the 5th switching tube Qa5The tie point of collector, the 8th switching tube Qb1Collector and the 9th switching tube Qb3 Collector and the 11st switching tube Qb5The tie point of collector, the 14th switching tube Qc1Collector and the 15th switching tube Qc3 Collector and the 17th switching tube Qc5The tie point of collector.Inductance La、Lb、LcThe other end respectively with to exchange side power supply (whole Stream or parallel network reverse) or threephase load connection (independent inversion).Capacitor Ca、Cb、CcThe other end be connected together.Isolation becomes A phase transformer primary side winding A in depressor 3pSame Name of Ends and C phase transformer primary side winding CpDifferent name end be connected, then opened with first Close pipe Qa2Collector and the 7th switching tube Qb2Collector and the 13rd switching tube Qc2The tie point of collector is connected；B phase-change pressure Device primary side winding BpSame Name of Ends and A phase transformer primary side winding ApDifferent name end be connected, then with the 4th switching tube Qa4Collector With the tenth switching tube Qb4Collector and sixteenmo close pipe Qc4The tie point of collector is connected；C phase transformer primary side winding Cp Same Name of Ends and B phase transformer primary side winding BpDifferent name end be connected, then with the 6th switching tube Qa6Collector and the 12nd switch Pipe Qb6Collector and eighteenmo close pipe Qc6The tie point of collector is connected.A phase transformer vice-side winding AsSame Name of Ends and B Phase transformer vice-side winding BsDifferent name end be connected, then with the 19th switching tube Qs1Emitter and the 20th switching tube Qs2Collection The tie point of electrode is connected；B phase transformer vice-side winding BsSame Name of Ends and C phase transformer vice-side winding CsDifferent name end be connected, Again with the 21st switching tube Qs3Emitter and the 22nd switching tube Qs4Collector tie point be connected；C phase transformer Vice-side winding CsSame Name of Ends and A phase transformer vice-side winding AsDifferent name end be connected, then with the 23rd switching tube Qs5Hair Emitter-base bandgap grading and the 24th switching tube Qs6Collector tie point be connected.One end of DC side energy storage inductor 5 and the 19th switch Pipe Qs1Collector, the 21st switching tube Qs3Collector and the 23rd switching tube Qs5Collector tie point phase Even；The other end is connected with the anode of DC side filter capacitor 6.6 negative terminal of DC side filter capacitor and the 20th switching tube Qs2Hair Emitter-base bandgap grading and the 22nd switching tube Qs4Emitter and the 24th switching tube Qs6Emitter tie point be connected.
The company of the two-way AC/DC converter of the three-phase of current mode single-stage isolated described in Fig. 5 and its modulation strategy isolating transformer Connecing mode is primary side star-pair side triangle connection.Exchanging side LC filter 1 includes three inductance La、Lb、Lc, three capacitors Ca、Cb、Cc, inductance La、Lb、LcOne end and capacitor Ca、Cb、CcOne end meet second switch Q respectivelya1Collector is opened with third Close pipe Qa3Collector and the 5th switching tube Qa5The tie point of collector, the 8th switching tube Qb1Collector and the 9th switching tube Qb3 Collector and the 11st switching tube Qb5The tie point of collector, the 14th switching tube Qc1Collector and the 15th switching tube Qc3 Collector and the 17th switching tube Qc5The tie point of collector.Inductance La、Lb、LcThe other end respectively with to exchange side power supply (whole Stream or parallel network reverse) or threephase load connection (independent inversion).Capacitor Ca、Cb、CcThe other end be connected together.Isolation becomes A phase transformer primary side winding A in depressorpTermination first switch tube Q of the same namea2Collector and the 7th switching tube Qb2Collector and 13rd switching tube Qc2The tie point of collector；B phase transformer primary side winding Bp4th switching tube Q of termination of the same namea4Collector With the tenth switching tube Qb4Collector and sixteenmo close pipe Qc4The tie point of collector；C phase transformer primary side winding CpIt is same The 6th switching tube Q of name terminationa6Collector and the 12nd switching tube Qb6Collector and eighteenmo close pipe Qc6The connection of collector Point.A phase transformer primary side winding ApDifferent name end and B phase transformer primary side winding BpDifferent name end and C phase transformer primary side around Group CpDifferent name end connection.A phase transformer vice-side winding AsSame Name of Ends and B phase transformer vice-side winding BsDifferent name end be connected, Again with energy storage inductor Lf1With the 19th switching tube Qs1Collector tie point be connected；B phase transformer vice-side winding BsIt is of the same name End and C phase transformer vice-side winding CsDifferent name end be connected, then with energy storage inductor Lf2With the 20th switching tube Qs2Collector Tie point is connected；C phase transformer vice-side winding CsSame Name of Ends and A phase transformer vice-side winding AsDifferent name end be connected, then with storage It can inductance Lf3With the 21st switching tube Qs3Collector tie point be connected.The anode of DC side filter capacitor 5 and energy storage electricity Feel Lf1、Lf2、Lf3The tie point of the other end is connected；The negative terminal of DC side filter capacitor 5 and the 19th switching tube Qs1Emitter, 20th switching tube Qs2Emitter and the 21st switching tube Qs3Emitter tie point be connected.
Wherein four kinds of combinations of isolating transformer provide the voltage ratio of the different equivalent other than turn ratio itself.Primary side Star-pair side triangle connection provides the additional step-down ratio of 2:1, is suitable for decompression occasion；Primary side triangle-pair side star-like connection mentions For 1:2 additional boost ratio, it is suitable for boosting occasion；Primary side star-pair triangle in star-like connection and primary side triangle-pair connects It connects and additional buck ratio is not provided.
Below by taking the two-way AC/DC converter of current mode single-stage isolated three-phase and its modulation strategy in Fig. 1 as an example, in conjunction with figure 6-11 describes the concrete operating principle of the two-way AC/DC converter of current mode single-stage isolated three-phase and its modulation strategy respectively.
Before analysis, make the following assumptions: 1) all switching tubes and diode are ideal component；2) all inductance, electricity Hold and transformer is ideal element；3) DC side filter inductance is sufficiently large, and can be approximately considered is a current source IL, ILIt is straight Flow side electric current.
In Fig. 1, ia、ib、icRespectively three pole reactor electric current, va、vb、vcRespectively three-phase alternating current side voltage.Assuming that every Former and deputy side umber of turn from three transformers in transformer 3 is all the same, respectively np、ns。iap、ibp、icpRespectively A, B, C Phase transformer primary side winding electric current, vTa、vTb、vTcRespectively A, B, C phase transformer primary side winding both end voltage, ias、ibs、icsPoint It Wei not A, B, C phase transformer secondary winding current.
When converter work is in rectification mode, it is input side that converter, which exchanges side, connects three-phase alternating current potential source, DC side For outlet side, load is connect；When converter work is in inverter mode, converter DC side is input side, connects DC voltage source, is handed over Stream side is outlet side, connects threephase load or three-phase alternating current potential source.As shown in fig. 6, using electric current outer ring, pair of current inner loop Closed-loop Control Strategy and space vector pulse width modulation (Space Vector Pulse Width Modulation, SVPWM) are adjusted System strategy controls converter.Using the feed forward decoupling control method based on two-phase rotating coordinate system, two-phase is rotated and is sat Electric current direct-axis component i under mark systemdWith quadrature axis component iqIt is respectively controlled.Due to introducing three height in converter of the invention Frequency power transformer, it is therefore desirable to while considering the magnetic reset problem of three transformers, and the implementation of existing SVPWM modulation technique Journey is not particularly suited for converter of the invention, need to propose the SVPWM modulation strategy suitable for converter of the present invention, and lower mask body is situated between Continue SVPWM modulation strategy proposed by the present invention.
Do not distinguish the modulation strategy of two switching tubes of each two-way switch of control exchange side:
1, switch state defines
UsingFormat define switch state, wherein Sa、Sb、ScRespectively represent QA1~6、QB1~6、QC1~6's Switch state.The each two-way switch for exchanging side includes two connected switching tubes, works as Qi1Or Qi2S when conductingiIt is -1, works as Qi3 Or Qi4S when conductingiIt is 0, works as Qi5Or Qi6S when conductingiIt is 1, works as QI1~6When being all not turned on, SiFor x, wherein i=a, b, c divide table Represent A phase, B phase, C phase；Sd、Se、SfRespectively represent six switching tube Q of DC side bridge arms1,2、Qs3,4、Qs5,6Switch state, As switching tube Qs1S when conductingd=1, as switching tube Qs2S when conductingd=0, as switching tube Qs1、Qs2S when being all not turned ond=x, when opening Close pipe Qs3S when conductinge=1, as switching tube Qs4S when conductinge=0, as switching tube Qs3、Qs4S when being all not turned one=x, works as switching tube Qs5S when conductingf=1, as switching tube Qs6S when conductingf=0, as switching tube Qs5、Qs6S when being all not turned onf=x, when work is rectifying It also can choose when mode and do not control DC side switching tube；A, B, C respectively represent A, B, C three-phase transformer both end voltage direction, When A phase transformer Same Name of Ends voltage be timing A be+, when A phase transformer Same Name of Ends voltage is negative A be-, when A phase transformer two Hold voltage when being zero A be 0, when B phase transformer Same Name of Ends voltage be timing B be+, the B when B phase transformer Same Name of Ends voltage is negative For-, when B phase transformer both end voltage is zero, B is 0, when C phase transformer Same Name of Ends voltage be timing C be+, when C phase transformer When Same Name of Ends voltage is negative C be-, when C phase transformer both end voltage is zero, C is 0.
2, the corresponding relationship of switch state and fundamental current vector
Due to the symmetry of three-phase current, with ia>0、ib<0、ic< 0 and ia>0、ib>0、icFor < 0 the two electric current sections Analyze the corresponding fundamental current vector of each switch state, Tables 1 and 2 be set forth in two electric current sections switch state with The corresponding relationship of current phasor.Pass through model analysis, in electric current positive half cycle, switching tube Qi1、Qi3、Qi5Conducting；In electric current negative half In week, switching tube Qi2、Qi4、Qi6Conducting.In rectification mode, secondary-side switch pipe QS1~6Driving signal can not be given, electric current flows through The anti-and diode D of switching tubeS1~6, S at this timed=x, Se=x, Sf=x.
1 i of tablea>0、ib<0、icThe corresponding relationship of switch state and current phasor when < 0
2 i of tablea>0、ib>0、icThe corresponding relationship of switch state and current phasor when < 0
Fig. 7 and Fig. 8 is respectively ia>0、ib<0、ic< 0 and ia>0、ib>0、icFundamental current in < 0 the two electric current sections Polar plot, adjacent two fundamental current vectors where only considering current phasor here in section.It can be seen that B phase current The change in direction, the corresponding switch state of fundamental current vector also accordingly change.And so on, Fig. 9 gives the electricity The fundamental current polar plot of the two-way AC/DC converter of flow pattern single-stage isolated three-phase and its modulation strategy, it can be seen that fundamental current Entire plane is divided into 6 sectors by the direction of vector.
3, switch state switch sequence is synthesized with current phasor
It is minimum according to switching number and guarantee the principle of three transformers voltage-second balance in a switch periods, Select transformer both end voltage direction change sequence for the positive B of A it is negative-the positive C of B is negative-the positive A of C is negative, at this time in ia>0、ib<0、ic< 0 this In one electric current section, switching order are as follows:
In ia>0、ib>0、icIn < 0 this electric current section, switching order are as follows:
I when Figure 10 gives two switching tubes for not distinguishing each two-way switch of control exchange sidea>0、ib<0、ic< 0 He ia>0、ib>0、icThe voltage waveform of switching tube drive waveforms and three transformer both ends in < 0 the two electric current sections.
4, sector partitioning method
By being analyzed above it is found that in ia>0、ib<0、ic< 0 and ia>0、ib>0、icDue to B phase in < 0 the two electric current sections The change of current direction, B phase switch state change.Therefore entire plane can be divided into 6 according to three-phase current direction Sector, as shown in Figure 9.
5, vector time calculation method
With ia>0、ib<0、icIllustrate the calculation method of each switch state action time for < 0 this electric current section.First Such as given a definition to the time of each switch state:
According to Fig. 7, it is assumed that component of the target current vector i under α β coordinate is iα、iβ, -30 degree directions can be calculated The action time of current phasor, 30 degree of directional current vectors and zero current is respectively T1、T2、T0:
According to the principle of Vector modulation and the principle of transformer voltage-second balance, available following formula:
Choose one group of special solution of above equation group:
Wherein switch periods Ts=T0+T1+T2, it is possible thereby to each switch state corresponding time be calculated, thus to change Parallel operation is accurately controlled.
Distinguish the modulation strategy of two switching tubes of each two-way switch of control exchange side:
1, switch state defines
UsingFormat define switch state, wherein Sa、Sb、ScRespectively represent QA1~6、QB1~6、QC1~6's Switch state.The each two-way switch for exchanging side includes two connected switching tubes, works as Qi1S when conductingiIt is -1+, work as Qi2Conducting When SiIt is -1-, work as Qi3S when conductingiIt is 0+, work as Qi4S when conductingiIt is 0-, work as Qi5S when conductingiIt is 1+, work as Qi6S when conductingiIt is 1-, Work as QI1~6S when being all not turned oniFor x, wherein i=a, b, c divide table to represent A phase, B phase, C phase；Sd、Se、SfRespectively represent DC side Six switching tube Q of bridge arms1,2、Qs3,4、Qs5,6Switch state, as switching tube Qs1S when conductingd=1, as switching tube Qs2Conducting When Sd=0, as switching tube Qs1、Qs2S when being all not turned ond=x, as switching tube Qs3S when conductinge=1, as switching tube Qs4S when conductinge =0, as switching tube Qs3、Qs4S when being all not turned one=x, as switching tube Qs5S when conductingf=1, as switching tube Qs6S when conductingf=0, As switching tube Qs5、Qs6S when being all not turned onf=x also can choose when work is in rectification mode and not control DC side switching tube； A, B, C respectively represent A, B, C three-phase transformer both end voltage direction, when A phase transformer Same Name of Ends voltage be timing A be+, work as A When phase transformer Same Name of Ends voltage is negative A be-, when A phase transformer both end voltage is zero, A is 0, when B phase transformer Same Name of Ends Voltage be timing B be+, when B phase transformer Same Name of Ends voltage is negative B be-, when B phase transformer both end voltage is zero, B is 0, When C phase transformer Same Name of Ends voltage be timing C be+, when C phase transformer Same Name of Ends voltage is negative C be-, when C phase transformer two C is 0 when end voltage is zero.
2, the corresponding relationship of switch state and fundamental current vector
Due to the symmetry of three-phase current, with ia>0、ib<0、ic< 0 and ia>0、ib>0、icFor < 0 the two electric current sections Analyze the corresponding fundamental current vector of each switch state, table 3 and table 4 be set forth in two electric current sections switch state with The corresponding relationship of current phasor.Pass through model analysis, in electric current positive half cycle, switching tube Qi1、Qi3、Qi5Conducting；In electric current negative half In week, switching tube Qi2、Qi4、Qi6Conducting.In rectification mode, secondary-side switch pipe QS1~6Driving signal can not be given, electric current flows through The anti-and diode D of switching tubeS1~6, S at this timed=x, Se=x, Sf=x.
3 i of tablea>0、ib<0、icThe corresponding relationship of switch state and current phasor when < 0
4 i of tablea>0、ib>0、icThe corresponding relationship of switch state and current phasor when < 0
By ia>0、ib<0、ic< 0 and ia>0、ib>0、icFundamental current vector in < 0 the two electric current sections, is only examined here Adjacent two fundamental current vectors where considering current phasor in section.It can be seen that the change in B phase current direction, substantially The corresponding switch state of current phasor also accordingly changes.And so on, Fig. 9 gives the current mode single-stage isolated three-phase The fundamental current polar plot of two-way AC/DC converter and its modulation strategy, it can be seen that the direction of fundamental current vector will be entire Plane is divided into 6 sectors.
3, switch state switch sequence is synthesized with current phasor
It is minimum according to switching number and guarantee the principle of three transformers voltage-second balance in a switch periods, Select transformer both end voltage direction change sequence for the positive B of A it is negative-the positive C of B is negative-the positive A of C is negative, at this time in ia>0、ib<0、ic< 0 this In one electric current section, switching order are as follows:
In ia>0、ib>0、icIn < 0 this electric current section, switching order are as follows:
I when Figure 11 gives two switching tubes for distinguishing each two-way switch of control exchange sidea>0、ib<0、ic< 0 and ia >0、ib>0、icThe voltage waveform of switching tube drive waveforms and three transformer both ends in < 0 the two electric current sections.
4, sector partitioning method
By being analyzed above it is found that in ia>0、ib<0、ic< 0 and ia>0、ib>0、icDue to B phase in < 0 the two electric current sections The change of current direction, B phase switch state change.Therefore entire plane can be divided into 6 according to three-phase current direction Sector, as shown in Figure 9.
5, vector time calculation method
With ia>0、ib<0、icIllustrate the calculation method of each switch state action time for < 0 this electric current section.First Such as given a definition to the time of each switch state:
According to Fig. 7, it is assumed that component of the target current vector i under α β coordinate is iα、iβ, -30 degree directions can be calculated The action time of current phasor, 30 degree of directional current vectors and zero current is respectively T1、T2、T0:
According to the principle of Vector modulation and the principle of transformer voltage-second balance, available following formula:
Choose one group of special solution of above equation group:
Wherein switch periods Ts=T0+T1+T2, it is possible thereby to each switch state corresponding time be calculated, thus to change Parallel operation is accurately controlled.
When DC side be Fig. 5 shown in three times stream rectification type structure and do not distinguish control exchange side each two-way switch two The modulation strategy of a switching tube:
1, switch state defines
UsingFormat define switch state, wherein Sa、Sb、ScIt respectively represents in exchange side three-phase bridge arm 18 switching tube QA1~6、QB1~6、QC1~6Switch state, each two-way switch for exchanging side includes two connected switches Pipe, works as Qi1Or Qi2S when conductingiIt is -1, works as Qi3Or Qi4S when conductingiIt is 0, works as Qi5Or Qi6S when conductingiIt is 1, works as QI1~6All not When conducting, SiFor x, wherein i=a, b, c divide table to represent A phase, B phase, C phase；Sd、Se、SfRespectively represent three of DC side bridge arm Switching tube Qs1、Qs2、Qs3Switch state, as switching tube Qs1S when conductingd=1, as switching tube Qs1S when being not turned ond=0, when opening Close pipe Qs2S when conductinge=1, as switching tube Qs2S when being not turned one=0, as switching tube Qs3S when conductingf=1, as switching tube Qs3No S when conductingf=0, it also can choose when work is in rectification mode and do not control DC side switching tube；A, B, C respectively represent A, B, C Three-phase transformer both end voltage direction, when A phase transformer Same Name of Ends voltage be timing A be+, when A phase transformer Same Name of Ends voltage When being negative A be-, when A phase transformer both end voltage is zero, A is 0, when B phase transformer Same Name of Ends voltage be timing B be+, work as B When phase transformer Same Name of Ends voltage is negative B be-, when B phase transformer both end voltage is zero, B is 0, when C phase transformer Same Name of Ends Voltage be timing C be+, when C phase transformer Same Name of Ends voltage is negative C be-, when C phase transformer both end voltage is zero, C is 0.
2, the corresponding relationship of switch state and fundamental current vector
Due to the symmetry of three-phase current, with ia>0、ib<0、ic< 0 and ia>0、ib>0、icFor < 0 the two electric current sections Analyze the corresponding fundamental current vector of each switch state, table 5 and table 6 be set forth in two electric current sections switch state with The corresponding relationship of current phasor.Pass through model analysis, in electric current positive half cycle, switching tube Qi1、Qi3、Qi5Conducting；In electric current negative half In week, switching tube Qi2、Qi4、Qi6Conducting.In rectification mode, secondary-side switch pipe QS1~3Driving signal can not be given, electric current flows through The anti-and diode D of switching tubeS1~3, S at this timed=0, Se=0, Sf=0.
5 i of tablea>0、ib<0、icThe corresponding relationship of switch state and current phasor when < 0
6 i of tablea>0、ib>0、icThe corresponding relationship of switch state and current phasor when < 0
By ia>0、ib<0、ic< 0 and ia>0、ib>0、icFundamental current vector in < 0 the two electric current sections, is only examined here Adjacent two fundamental current vectors where considering current phasor in section.It can be seen that the change in B phase current direction, substantially The corresponding switch state of current phasor also accordingly changes.And so on, entire plane is drawn in the direction of fundamental current vector It is divided into 6 sectors.
3, switch state switch sequence is synthesized with current phasor
It is minimum according to switching number and guarantee the principle of three transformers voltage-second balance in a switch periods, Select transformer both end voltage direction change sequence for the positive B of A it is negative-the positive C of B is negative-the positive A of C is negative, at this time in ia>0、ib<0、ic< 0 this In one electric current section, switching order are as follows:
In ia>0、ib>0、icIn < 0 this electric current section, switching order are as follows:
I when Figure 10 gives two switching tubes for not distinguishing each two-way switch of control exchange sidea>0、ib<0、ic< 0 He ia>0、ib>0、icThe voltage waveform of switching tube drive waveforms and three transformer both ends in < 0 the two electric current sections.
4, sector partitioning method
By being analyzed above it is found that in ia>0、ib<0、ic< 0 and ia>0、ib>0、icDue to B phase in < 0 the two electric current sections The change of current direction, B phase switch state change.Therefore entire plane can be divided into 6 according to three-phase current direction Sector, as shown in Figure 9.
5, vector time calculation method
With ia>0、ib<0、icIllustrate the calculation method of each switch state action time for < 0 this electric current section.First Such as given a definition to the time of each switch state:
According to Fig. 7, it is assumed that component of the target current vector i under α β coordinate is iα、iβ, -30 degree directions can be calculated The action time of current phasor, 30 degree of directional current vectors and zero current is respectively T1、T2、T0:
According to the principle of Vector modulation and the principle of transformer voltage-second balance, available following formula:
Choose one group of special solution of above equation group:
Wherein switch periods Ts=T0+T1+T2, it is possible thereby to each switch state corresponding time be calculated, thus to change Parallel operation is accurately controlled.

Claims (10)

1. a kind of two-way AC/DC converter of current mode single-stage isolated three-phase and its modulation strategy, which is characterized in that including exchanging side Circuit, isolating transformer, direct current lateral circuit；Exchanging lateral circuit includes exchange side filter inductance, exchange side filter capacitor, exchange side Three-phase bridge arm, DC side include DC side bridge arm, DC side energy storage inductor and DC side filter capacitor, and isolating transformer is by three Transformer is constituted；
The bridge arm of the exchange every one-phase circuit in side includes upper two-way switch, middle two-way switch, lower two-way switch,
Exchange connected one end of the upper two-way switch of bridge arm, middle two-way switch, lower two-way switch of the every one-phase circuit in side respectively with One end of corresponding filter inductance connects and connect with one end of corresponding filter capacitor,
Exchange the upper two-way switch of bridge arm of the every one-phase circuit in side, middle two-way switch, lower two-way switch the other end respectively with its The other end of its two corresponding two-way switch, which is connected, constitutes three points of common connection, then respectively with isolating transformer primary side around The port of three corresponding external connections of group is connected,
Exchange the other ends of three filter inductances of side respectively with exchange side power supply (rectify or parallel network reverse) or threephase load It connects (independent inversion),
It exchanges and is connected between three filter capacitor other ends of side；
Each bridge arm of DC side be composed in series by two switching tubes and the midpoint of each bridge arm respectively with isolating transformer pair The port of the corresponding external connection of side winding is connected,
Three bridge arm parallel connections, bridge arm one end connect the anode of DC side filter capacitor, bridge arm after connecting with DC side energy storage inductor The negative terminal of other end connection DC side filter capacitor.
2. converter according to claim 1, which is characterized in that the alternative solution of each bridge arm of DC side are as follows: direct current Side includes three bridge arms, and three bridge arm parallel connections, each bridge arm includes that an energy storage inductor is connected with a switching tube, wherein energy storage The port of inductance one end external connection corresponding with isolating transformer vice-side winding connects and the other end connects DC side filtered electrical The port of the anode of appearance, the collector of switching tube external connection corresponding with isolating transformer vice-side winding connects and emitter connects Connect the negative terminal of DC side filter capacitor.
3. converter according to claim 1 or 2, which is characterized in that the isolating transformer includes three transformers, is become The connection type that the primary side winding of depressor, vice-side winding use connects for star-like connection or triangle；Wherein
Star-like connection is connected for the winding different name end of three transformers and three ports of the Same Name of Ends as external connection；
The Same Name of Ends that triangle is connected as adjacent transformers winding is connected three ports as external connection with different name end.
4. converter according to claim 1 or 2, which is characterized in that then according to primary side star-pair side triangle connection The additional step-down ratio of 2:1 is provided；1:2 additional boost ratio is then provided according to primary side triangle-pair side star-like connection；According to primary side Star-pair triangle when star-like connection is with primary side triangle-pair connects, and does not provide additional buck ratio.
5. converter according to claim 1 or 2, which is characterized in that the exchange each two-way switch in side includes two and is connected Switching tube and two diodes；Wherein
The emitter of two switching tubes is connected, the exchange side electricity of the collector connection exchange side circuitry phase of two switching tubes Sense and the corresponding external connection port of another collector connection isolating transformer primary side winding,
Alternatively, the collector of two switching tubes is connected, the friendship of the emitter connection exchange side circuitry phase of two switching tubes Side inductance and the corresponding external connection port of another emitter connection isolating transformer primary side winding are flowed,
The anode of each diode is with the connection of the emitter of corresponding switching tube and cathode is connect with collector.
6. converter according to claim 1 or 2, which is characterized in that the diode of each switching tube is parasitic diode Or the diode of each switching tube is anti-and diode.
7. converter according to claim 1 or 2, which is characterized in that switching tube can be triode or IGBT, switch The emitter that the collector of pipe corresponds to the triode perhaps collector switching tube of IGBT corresponds to triode or the transmitting of IGBT Pole；Switching tube is also possible to MOSFET, and the collector of switching tube corresponds to the drain electrode of MOSFET, and the emitter of switching tube is corresponding The source electrode of MOSFET.
8. a kind of SVPWM modulation strategy of converter according to claim 1, which is characterized in that do not distinguish control exchange side Each two-way switch two switching tubes, comprising the following steps:
Step 1, it usesFormat define switch state, Sa、Sb、ScIt respectively represents ten in exchange side three-phase bridge arm The switch state of eight switching tubes, A, B, C respectively represent A, B, C three-phase transformer both end voltage direction, Sd、Se、SfIt respectively represents Six switching tube Q of DC side bridge arms1,2、Qs3,4、Qs5,6Switch state；
Step 2, Space current vector synthesized by the switch state of all various combinations is formed into hexagon, entire plane is drawn It is divided into 6 sectors；
Step 3, Vector modulation is carried out according to the sector of division, it is minimum according to switch state switching times and guarantee three transformations The principle of device voltage-second balance determines switch state switch sequence and obtains the time of each switch state；
Exchange side three-phase bridge arm is made of 18 switching tubes, and every phase bridge arm in three-phase bridge arm is respectively by six switching tubes Composition, wherein
A phase bridge arm includes the first to the 6th switching tube (Qa2、Qa1、Qa3、Qa4、Qa5、Qa6), B phase bridge arm includes the 7th to the 12nd Switching tube (Qb2、Qb1、Qb3、Qb4、Qb5、Qb6), C phase bridge arm includes that the 13rd switching tube to eighteenmo closes pipe (Qc2、Qc1、Qc3、 Qc4、Qc5、Qc6)；
First switch tube (Qa2) emitter and second switch (Qa1) emitter be connected upper two-way switch as A phase,
Third switching tube (Qa3) emitter and the 4th switching tube (Qa4) emitter be connected middle two-way switch as A phase,
5th switching tube (Qa5) emitter and the 6th switching tube (Qa6) emitter be connected lower two-way switch as A phase,
Second switch (Qa1) collector and third switching tube (Qa3) collector, the 5th switching tube (Qa5) collector phase Even,
7th switching tube (Qb2) emitter and the 8th switching tube (Qb1) emitter be connected upper two-way switch as B phase,
9th switching tube (Qb3) emitter and the tenth switching tube (Qb4) emitter be connected middle two-way switch as B phase,
11st switching tube (Qb5) emitter and the 12nd switching tube (Qb6) emitter be connected lower two-way opened as B phase It closes,
8th switching tube (Qb1) collector and the 9th switching tube (Qb3) collector, the 11st switching tube (Qb5) collector It is connected,
13rd switching tube (Qc2) emitter and the 14th switching tube (Qc1) emitter be connected upper two-way opened as C phase It closes,
15th switching tube (Qc3) emitter and sixteenmo close pipe (Qc4) emitter be connected middle two-way opened as C phase It closes,
17th switching tube (Qc5) emitter and eighteenmo close pipe (Qc6) emitter be connected lower two-way opened as C phase It closes,
14th switching tube (Qc1) collector and the 15th switching tube (Qc3) collector, the 17th switching tube (Qc5) collection Electrode is connected,
First switch tube (Qa2) collector and the 7th switching tube (Qb2) collector, the 13rd switching tube (Qc2) collector The a port being connected as connection transformer,
4th switching tube (Qa4) collector and the tenth switching tube (Qb4) collector, sixteenmo close pipe (Qc4) collector The a port being connected as connection transformer,
6th switching tube (Qa6) collector and the 12nd switching tube (Qb6) collector, eighteenmo close pipe (Qc6) current collection The a port being extremely connected as connection transformer；
The DC side bridge arm is made of six switching tubes, wherein
19th switching tube (Qs1) emitter and the 20th switching tube (Qs2) collector be connected,
21st switching tube (Qs3) emitter and the 22nd switching tube (Qs4) collector be connected,
23rd switching tube (Qs5) emitter and the 24th switching tube (Qs6) collector be connected,
19th switching tube (Qs1) collector and the 21st switching tube (Qs3) collector, the 23rd switching tube (Qs5) Collector be connected, connect DC side energy storage inductor after be connected with the anode of DC side filter capacitor,
20th switching tube (Qs2) emitter and the 22nd switching tube (Qs4) emitter, the 24th switching tube (Qs6) Emitter be connected, connect DC side filter capacitor negative terminal；
In step 1, each two-way switch for exchanging side includes two connected switching tubes,
Work as Qi1S when conductingiIt is -1,
Work as Qi2S when conductingiIt is -1,
Work as Qi3S when conductingiIt is 0,
Work as Qi4S when conductingiIt is 0,
Work as Qi5S when conductingiIt is 1,
Work as Qi6S when conductingiIt is 1,
Work as QI1~6When being all not turned on, SiFor x, wherein i=a, b, c divide table to represent A phase, B phase, C phase；
As switching tube Qs1S when conductingd=1,
As switching tube Qs2S when conductingd=0,
As switching tube Qs1、Qs2S when being all not turned ond=x,
As switching tube Qs3S when conductinge=1,
As switching tube Qs4S when conductinge=0,
As switching tube Qs3、Qs4S when being all not turned one=x,
As switching tube Qs5S when conductingf=1,
As switching tube Qs6S when conductingf=0,
As switching tube Qs5、Qs6S when being all not turned onf=x can choose when work is in rectification mode and not control DC side switch Pipe；
When A phase transformer Same Name of Ends voltage be timing A be+,
When A phase transformer Same Name of Ends voltage is negative A be-,
When A phase transformer both end voltage is zero, A is 0,
When B phase transformer Same Name of Ends voltage be timing B be+,
When B phase transformer Same Name of Ends voltage is negative B be-,
When B phase transformer both end voltage is zero, B is 0,
When C phase transformer Same Name of Ends voltage be timing C be+,
When C phase transformer Same Name of Ends voltage is negative C be-,
When C phase transformer both end voltage is zero, C is 0；
In step 2, Space current vector synthesized by the switch state of all various combinations is formed into hexagon, the hexagon packet Containing 6 non-zero current vectors, zero current vector, entire hexagon is divided into 6 sectors by 6 non-zero current direction vectors；It is non- Zero current vector sum zero current vector is defined as fundamental current vector；
The detailed process of step 3 is:
Step 3.1, respectively select non-zero current vector 3 corresponding on two fundamental current direction vectors of each sector borders 9 switch states are divided into three groups, every group by switch state and corresponding 3 switch states of zero current vector totally 9 switch states Including each 1 switch state and corresponding 1 switch state of zero current vector on two fundamental current direction vectors, every group The resultant action time of three switch states is one third switch periods；
Step 3.2, the action time of the corresponding fundamental current vector of every group of three switch states is obtained respectively；
Step 3.3, according to the principle of the principle of Vector modulation and transformer voltage-second balance obtain time of each switch state with Relation equation group between the action time of fundamental current vector；
Step 3.4, Xie Shangshu equation group obtains each switch state corresponding time.
9. a kind of SVPWM modulation strategy of converter according to claim 1, which is characterized in that distinguish control exchange side Two switching tubes of each two-way switch, comprising the following steps:
Step 1, it usesFormat define switch state, Sa、Sb、ScIt respectively represents ten in exchange side three-phase bridge arm The switch state of eight switching tubes, A, B, C respectively represent A, B, C three-phase transformer both end voltage direction, Sd、Se、SfIt respectively represents Six switching tube Q of DC side bridge arms1,2、Qs3,4、Qs5,6Switch state；
Step 2, Space current vector synthesized by the switch state of all various combinations is formed into hexagon, entire plane is drawn It is divided into 6 sectors；
Step 3, to carry out Vector modulation according to the sector of division minimum according to switch state switching times and guarantee three transformations The principle of device voltage-second balance determines switch state switch sequence and obtains the time of each switch state；
Exchange side three-phase bridge arm is made of 18 switching tubes, and every phase bridge arm in three-phase bridge arm is respectively by six switching tubes Composition, wherein
A phase bridge arm includes the first to the 6th switching tube (Qa2、Qa1、Qa3、Qa4、Qa5、Qa6),
B phase bridge arm includes the 7th to the 12nd switching tube (Qb2、Qb1、Qb3、Qb4、Qb5、Qb6),
C phase bridge arm includes that the 13rd switching tube to eighteenmo closes pipe (Qc2、Qc1、Qc3、Qc4、Qc5、Qc6)；
First switch tube (Qa2) emitter and second switch (Qa1) emitter be connected upper two-way switch as A phase,
Third switching tube (Qa3) emitter and the 4th switching tube (Qa4) emitter be connected middle two-way switch as A phase,
5th switching tube (Qa5) emitter and the 6th switching tube (Qa6) emitter be connected lower two-way switch as A phase,
Second switch (Qa1) collector and third switching tube (Qa3) collector, the 5th switching tube (Qa5) collector phase Even,
7th switching tube (Qb2) emitter and the 8th switching tube (Qb1) emitter be connected upper two-way switch as B phase,
9th switching tube (Qb3) emitter and the tenth switching tube (Qb4) emitter be connected middle two-way switch as B phase,
11st switching tube (Qb5) emitter and the 12nd switching tube (Qb6) emitter be connected lower two-way opened as B phase It closes,
8th switching tube (Qb1) collector and the 9th switching tube (Qb3) collector, the 11st switching tube (Qb5) collector It is connected,
13rd switching tube (Qc2) emitter and the 14th switching tube (Qc1) emitter be connected upper two-way opened as C phase It closes,
15th switching tube (Qc3) emitter and sixteenmo close pipe (Qc4) emitter be connected middle two-way opened as C phase It closes,
17th switching tube (Qc5) emitter and eighteenmo close pipe (Qc6) emitter be connected lower two-way opened as C phase It closes,
14th switching tube (Qc1) collector and the 15th switching tube (Qc3) collector, the 17th switching tube (Qc5) collection Electrode is connected,
First switch tube (Qa2) collector and the 7th switching tube (Qb2) collector, the 13rd switching tube (Qc2) collector The a port being connected as connection transformer,
4th switching tube (Qa4) collector and the tenth switching tube (Qb4) collector, sixteenmo close pipe (Qc4) collector The a port being connected as connection transformer,
6th switching tube (Qa6) collector and the 12nd switching tube (Qb6) collector, eighteenmo close pipe (Qc6) current collection The a port being extremely connected as connection transformer；
The DC side bridge arm is made of six switching tubes, wherein
19th switching tube (Qs1) emitter and the 20th switching tube (Qs2) collector be connected,
21st switching tube (Qs3) emitter and the 22nd switching tube (Qs4) collector be connected,
23rd switching tube (Qs5) emitter and the 24th switching tube (Qs6) collector be connected,
19th switching tube (Qs1) collector and the 21st switching tube (Qs3) collector, the 23rd switching tube (Qs5) Collector be connected, connect DC side energy storage inductor after be connected with the anode of DC side filter capacitor,
20th switching tube (Qs2) emitter and the 22nd switching tube (Qs4) emitter, the 24th switching tube (Qs6) Emitter be connected, connect DC side filter capacitor negative terminal；
In step 1, each two-way switch for exchanging side includes two connected switching tubes,
Work as Qi1S when conductingiIt is -1+,
Work as Qi2S when conductingiIt is -1-,
Work as Qi3S when conductingiIt is 0+,
Work as Qi4S when conductingiIt is 0-,
Work as Qi5S when conductingiIt is 1+,
Work as Qi6S when conductingiIt is 1-,
Work as QI1~6When being all not turned on, SiFor x, wherein i=a, b, c divide table to represent A phase, B phase, C phase；
As switching tube Qs1S when conductingd=1,
As switching tube Qs2S when conductingd=0,
As switching tube Qs1、Qs2S when being all not turned ond=x,
As switching tube Qs3S when conductinge=1,
As switching tube Qs4S when conductinge=0,
As switching tube Qs3、Qs4S when being all not turned one=x,
As switching tube Qs5S when conductingf=1,
As switching tube Qs6S when conductingf=0,
As switching tube Qs5、Qs6S when being all not turned onf=x,
It also can choose when work is in rectification mode and do not control DC side switching tube；
When A phase transformer Same Name of Ends voltage be timing A be+,
When A phase transformer Same Name of Ends voltage is negative A be-,
When A phase transformer both end voltage is zero, A is 0,
When B phase transformer Same Name of Ends voltage be timing B be+,
When B phase transformer Same Name of Ends voltage is negative B be-,
When B phase transformer both end voltage is zero, B is 0,
When C phase transformer Same Name of Ends voltage be timing C be+,
When C phase transformer Same Name of Ends voltage is negative C be-,
When C phase transformer both end voltage is zero, C is 0；
In step 2, Space current vector synthesized by the switch state of all various combinations is formed into hexagon, the hexagon packet Containing 6 non-zero current vectors, zero current vector, entire hexagon is divided into 6 sectors by 6 non-zero current direction vectors；It is non- Zero current vector sum zero current vector is defined as fundamental current vector；
The detailed process of step 3 is:
Step 3.1, respectively select non-zero current vector 3 corresponding on two fundamental current direction vectors of each sector borders 9 switch states are divided into three groups, every group by switch state and corresponding 3 switch states of zero current vector totally 9 switch states Including each 1 switch state and corresponding 1 switch state of zero current vector on two fundamental current direction vectors, every group The resultant action time of three switch states is one third switch periods；
Step 3.2, the action time of the corresponding fundamental current vector of every group of three switch states is obtained respectively；
Step 3.3, according to the principle of the principle of Vector modulation and transformer voltage-second balance obtain time of each switch state with Relation equation group between the action time of fundamental current vector；
Step 3.4, Xie Shangshu equation group obtains each switch state corresponding time.
10. a kind of SVPWM modulation strategy of converter according to claim 2, which is characterized in that do not distinguish control exchange side Each two-way switch two switching tubes, comprising the following steps:
Step 1, it usesFormat define switch state, Sa、Sb、ScIt respectively represents ten in exchange side three-phase bridge arm The switch state of eight switching tubes, A, B, C respectively represent A, B, C three-phase transformer both end voltage direction, Sd、Se、SfIt respectively represents Six switching tube Q of DC side bridge arms1,2、Qs3,4、Qs5,6Switch state；
Step 2, Space current vector synthesized by the switch state of all various combinations is formed into hexagon, entire plane is drawn It is divided into 6 sectors；
Step 3, to carry out Vector modulation according to the sector of division minimum according to switch state switching times and guarantee three transformations The principle of device voltage-second balance determines switch state switch sequence and obtains the time of each switch state；
Exchange side three-phase bridge arm is made of 18 switching tubes, and every phase bridge arm in three-phase bridge arm is respectively by six switching tubes Composition, wherein
A phase bridge arm includes the first to the 6th switching tube (Qa2、Qa1、Qa3、Qa4、Qa5、Qa6),
B phase bridge arm includes the 7th to the 12nd switching tube (Qb2、Qb1、Qb3、Qb4、Qb5、Qb6),
C phase bridge arm includes that the 13rd switching tube to eighteenmo closes pipe (Qc2、Qc1、Qc3、Qc4、Qc5、Qc6)；
First switch tube (Qa2) emitter and second switch (Qa1) emitter be connected upper two-way switch as A phase,
Third switching tube (Qa3) emitter and the 4th switching tube (Qa4) emitter be connected middle two-way switch as A phase,
5th switching tube (Qa5) emitter and the 6th switching tube (Qa6) emitter be connected lower two-way switch as A phase,
Second switch (Qa1) collector and third switching tube (Qa3) collector, the 5th switching tube (Qa5) collector phase Even,
7th switching tube (Qb2) emitter and the 8th switching tube (Qb1) emitter be connected upper two-way switch as B phase,
9th switching tube (Qb3) emitter and the tenth switching tube (Qb4) emitter be connected middle two-way switch as B phase,
11st switching tube (Qb5) emitter and the 12nd switching tube (Qb6) emitter be connected lower two-way opened as B phase It closes,
8th switching tube (Qb1) collector and the 9th switching tube (Qb3) collector, the 11st switching tube (Qb5) collector It is connected,
13rd switching tube (Qc2) emitter and the 14th switching tube (Qc1) emitter be connected upper two-way opened as C phase It closes,
15th switching tube (Qc3) emitter and sixteenmo close pipe (Qc4) emitter be connected middle two-way opened as C phase It closes,
17th switching tube (Qc5) emitter and eighteenmo close pipe (Qc6) emitter be connected lower two-way opened as C phase It closes,
14th switching tube (Qc1) collector and the 15th switching tube (Qc3) collector, the 17th switching tube (Qc5) collection Electrode is connected,
First switch tube (Qa2) collector and the 7th switching tube (Qb2) collector, the 13rd switching tube (Qc2) collector The a port being connected as connection transformer,
4th switching tube (Qa4) collector and the tenth switching tube (Qb4) collector, sixteenmo close pipe (Qc4) collector The a port being connected as connection transformer,
6th switching tube (Qa6) collector and the 12nd switching tube (Qb6) collector, eighteenmo close pipe (Qc6) current collection The a port being extremely connected as connection transformer；
The DC side bridge arm is made of three energy storage inductors and three switching tubes, wherein
Energy storage inductor (Lf1) one end and the 19th switching tube (Qs1) collector be connected,
Energy storage inductor (Lf2) one end and the 20th switching tube (Qs2) collector be connected,
Energy storage inductor (Lf3) one end and the 21st switching tube (Qs3) collector be connected,
Energy storage inductor (Lf1) the other end and energy storage inductor (Lf2) the other end, energy storage inductor (Lf3) the other end be connected, connection The anode of DC side filter capacitor,
19th switching tube (Qs1) emitter and the 20th switching tube (Qs2) emitter, the 21st switching tube (Qs3) Emitter is connected, and connects the negative terminal of DC side filter capacitor；
In step 1, each two-way switch for exchanging side includes two connected switching tubes,
Work as Qi1Or Qi2S when conductingiIt is -1,
Work as Qi3Or Qi4S when conductingiIt is 0,
Work as Qi5Or Qi6S when conductingiIt is 1,
Work as QI1~6When being all not turned on, SiFor x, wherein i=a, b, c divide table to represent A phase, B phase, C phase；
As switching tube Qs1S when conductingd=1,
As switching tube Qs1S when being not turned ond=0,
As switching tube Qs2S when conductinge=1,
As switching tube Qs2S when being not turned one=0,
As switching tube Qs3S when conductingf=1,
As switching tube Qs3S when being not turned onf=0,
It can choose when work is in rectification mode and do not control DC side switching tube；
When A phase transformer Same Name of Ends voltage be timing A be+,
When A phase transformer Same Name of Ends voltage is negative A be-,
When A phase transformer both end voltage is zero, A is 0,
When B phase transformer Same Name of Ends voltage be timing B be+,
When B phase transformer Same Name of Ends voltage is negative B be-,
When B phase transformer both end voltage is zero, B is 0,
When C phase transformer Same Name of Ends voltage be timing C be+,
When C phase transformer Same Name of Ends voltage is negative C be-,
When C phase transformer both end voltage is zero, C is 0；
In step 2, Space current vector synthesized by the switch state of all various combinations is formed into hexagon, the hexagon packet Containing 6 non-zero current vectors, zero current vector, entire hexagon is divided into 6 sectors by 6 non-zero current direction vectors；It is non- Zero current vector sum zero current vector is defined as fundamental current vector；
The detailed process of step 3 is:
Step 3.1, respectively select non-zero current vector 3 corresponding on two fundamental current direction vectors of each sector borders 9 switch states are divided into three groups, every group by switch state and corresponding 3 switch states of zero current vector totally 9 switch states Including each 1 switch state and corresponding 1 switch state of zero current vector on two fundamental current direction vectors, every group The resultant action time of three switch states is one third switch periods；
Step 3.2, the action time of the corresponding fundamental current vector of every group of three switch states is obtained respectively；
Step 3.3, according to the principle of the principle of Vector modulation and transformer voltage-second balance obtain time of each switch state with Relation equation group between the action time of fundamental current vector；
Step 3.4, Xie Shangshu equation group obtains each switch state corresponding time.
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