CN109412440A - A kind of phase-shifting carrier wave SVPWM method suitable for line voltage cascaded type triple modular redundant current transformer - Google Patents

A kind of phase-shifting carrier wave SVPWM method suitable for line voltage cascaded type triple modular redundant current transformer Download PDF

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CN109412440A
CN109412440A CN201710927377.5A CN201710927377A CN109412440A CN 109412440 A CN109412440 A CN 109412440A CN 201710927377 A CN201710927377 A CN 201710927377A CN 109412440 A CN109412440 A CN 109412440A
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phase
unit
svpwm
switching group
bridge arm
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CN109412440B (en
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王志强
于安波
夏长亮
左志文
姚欢
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Tianjin Polytechnic University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—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
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • 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
    • H02M7/493—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 the static converters being arranged for operation in parallel
    • 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
    • H02M7/53873—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 digital control
    • 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
    • H02M7/539—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 with automatic control of output wave form or frequency
    • H02M7/5395—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 with automatic control of output wave form or frequency by pulse-width modulation

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

Abstract

The invention belongs to power electronic circuit control fields, it is related to a kind of phase-shifting carrier wave PWM method suitable for line voltage cascaded type triple modular redundant current transformer, triple modular redundant current transformer is equivalent to a switching circuit first by this method, one group of three-phase modulations wave is obtained with this, next reconfigures out 3 switching groups, and the carrier phase by adjusting corresponding switching group is modulated.This method can be applied to the fields such as electric machine speed regulation, renewable energy power generation, its advantage is the problem that link circuit electric current is excessive between unit caused by effectively reducing conventional carrier phase shift SVPWM, a large amount of nonideal switch states are eliminated, exchange side due to voltage spikes and harmonic wave are reduced；And maintain the accessible DC bus-bar voltage utilizing status of SVPWM；Meanwhile using phase-shifting carrier wave effect, the Redundanter schalter state of generation effectively reduces current harmonics.

Description

A kind of phase-shifting carrier wave SVPWM tune suitable for line voltage cascaded type triple modular redundant current transformer Method processed
Technical field
The invention belongs to power electronic circuit control fields, are related to a kind of suitable for line voltage cascaded type triple modular redundant current transformer Phase-shifting carrier wave PWM method, this method can be applied to the fields such as electric machine speed regulation, renewable energy power generation.
Background technique
Power electronic technique is constantly expanded in Electrified Transmission, the application field of generation of electricity by new energy, the voltage and function faced Rate grade is also constantly being promoted.And it is limited to the development speed of semiconductor technology, voltage and power of single semiconductor devices etc. Grade is often difficult to adapt to some high voltages, large-power occasions.Such as high pressure mine hoisting, motor terminal voltage reaches 6kV or more, this will Ask motor side inverter DC bus-bar voltage up to 10kV or more, traditional two level or even three-level structure are all difficult to adapt to. For this purpose, scientific research personnel constitutes multiple inverter configuration current transformer by two level blocks of recombination both at home and abroad.This patent proposes a kind of new Type phase-shifting carrier wave SVPWM method, the advantage of this method are to take full advantage of phase-shifting carrier wave bring Redundanter schalter state, with And the characteristics of SVPWM distinctive high DC bus-bar voltage utilization rate, while reducing line voltage harmonic content.
Summary of the invention
It is an object of the invention to overcome the above-mentioned deficiency of the prior art, provide a kind of triple suitable for line voltage cascaded type Change the phase-shifting carrier wave PWM method of current transformer, this kind of control method is the modulation strategy of a kind of simple possible, high reliablity. The present invention adopts the following technical scheme:
Firstly, defining the corresponding number of each component units and phase sequence in line voltage cascaded type triple modular redundant current transformer；Definition is single The three-phase of member 1 is respectively a1, b1 and c1 phase, and between 120 ° of mutual deviation, the three-phase of unit 2 is respectively a2, b2 and c2, and between 120 ° of mutual deviation, the three-phase of unit 3 is respectively a3, b3 and c3, and between 120 ° of mutual deviation；The a1 phase bridge arm of selection unit 1 is as three The A phase bridge arm of change current transformer entirety again, B phase bridge arm of the b2 phase bridge arm of unit 2 as triple modular redundant current transformer entirety, unit 3 C phase bridge arm of the c3 phase bridge arm as current transformer entirety, and this three bridge arms are regarded as a switching group, it is labeled as switching group 1；It takes A phase of the a2 phase bridge arm of unit 2 as a new switching group, the b1 phase bridge arm of unit 1 are the B phase of new switching group, the c2 of unit 2 Phase bridge arm is the C phase of new switching group, and defining the new switching group is switching group 2；The a3 phase bridge arm for taking unit 3 is that another is newly opened The A phase of pass group, the b3 phase bridge arm of unit 3 are the B phase of in addition new switching group, and the c1 phase bridge arm of unit 1 is the C of in addition new switching group Phase, the switching group are labeled as switching group 3；
Secondly, switching group 1 may be regarded as a set of two level topological structure of three-phase, and carried out using two level SVPWM methods Modulation, and it is labeled as SVPWM computing unit 1；For switching group 2, two level SVPWM modulator approaches are also used, are labeled as SVPWM The modulating wave of computing unit 2, SVPWM computing unit 2 is identical as modulating wave used in SVPWM computing unit 1, but carrier wave lag 1/3 A switch periods；For switching group 3, SVPWM method is also used, is labeled as SVPWM computing unit 3, the modulation of SVPWM3 Wave is identical as modulating wave used in SVPWM computing unit 1, but carrier wave lags 1/3 switch periods；Numerical control system can be according to tune Wave processed SVPWM waveform corresponding with the generation of carrier wave size relation；
It is influenced by line voltage cascaded type triple modular redundant converter structure feature, wherein being modulated in two level SVPWMs Wave acquisition methods are specific as follows:
Since line voltage cascaded type triple modular redundant current transformer can be equivalent to a switching circuit, wherein the DC bus after equivalent Voltage UDc, eqEqual to twice Uav, UavThe average value of DC bus-bar voltage is corresponded to for three groups of power cells, if each SVPWM generates list Member is all made of 2Uav/ 3 as reference axis in space vector coordinate system mould it is long, then control system is according to switching circuit institute after equivalent The reference voltage vector U of acquisitionref, the given reference voltage vector that each SVPWM generation unit need to be re-used as multiplied by 1/2, Jin Erke Obtain one group of three-phase modulations wave.
Link circuit electric current is excessive between above-mentioned modulating mode effectively reduces unit caused by conventional carrier phase shift SVPWM Problem eliminates a large amount of nonideal switch states, reduces exchange side due to voltage spikes and harmonic wave；The strategy maintains SVPWM Accessible DC bus-bar voltage utilizing status；Meanwhile using phase-shifting carrier wave effect, the Redundanter schalter state of generation is effectively reduced Current harmonics.
Detailed description of the invention
Fig. 1: line voltage cascaded type triple modular redundant converter topology figure；
Fig. 2: line voltage cascaded type triple modular redundant current transformer equivalent circuit；
Fig. 3: phase-shifting carrier wave SVPWM modulating wave and carrier wave figure；
Specific embodiment
Line voltage cascaded type triple modular redundant converter topologies are as shown in Figure 1.First definition unit number and it is corresponding Phase sequence number.As shown in Figure 1, unit 1 corresponds to a1, b1 and c1 three-phase；Unit 2 corresponds to a2, b2 and c2 three-phase；The correspondence of unit 3 a3, B3 and c3 three-phase；LfIndicate Inductor load, RloadIndicate exchange side resistance load, LxIndicate current-limiting inductance；iAIt indicates to become Flow device A phase inverter output current, iBIndicate current transformer B phase inverter output current, iCIndicate current transformer C phase inverter output current； Udc1、Udc2And Udc3Respectively DC power supply voltage 1,2 and 3.
Firstly, choosing the A phase that a1 phase is triple modular redundant current transformer, b2 phase is the B phase of triple modular redundant current transformer, and c3 phase is triple modular redundant The C phase of current transformer, and enable this three phase compositions switching group 1.Similarly, A of the a2 phase bridge arm of selection unit 2 as a new switching group Phase, the b1 phase bridge arm of unit 1 are the B phase of new switching group, and the c2 phase bridge arm of unit 2 is the C phase of new switching group, define the new switch Group is switching group 2；The a3 phase bridge arm of selection unit 3 is the A phase of another new switching group, in addition the b3 phase bridge arm of unit 3 is The B phase of new switching group, the c1 phase bridge arm of unit 1 are the C phase of in addition new switching group, which is labeled as switching group 3.
Secondly, the circuit loop that 1 intermediate ring road 1 of analysis chart is constituted, writes Kirchoff s voltage loop equation side by side:
UAB=Ua1b1+Ua2b2+Ub1a2=(Rload+jωLf)(IA-IB) (1)
In formula, UABIt is the alternate line voltage phasor of triple modular redundant AC side of converter A, B, Ua1b1It is unit 1 in triple modular redundant current transformer Exchange the alternate line voltage phasor of side a1, b1, Ua2b2It is the alternate line voltage phase of exchange side a2, b2 of unit 2 in triple modular redundant current transformer Amount, Ub1a2It is the voltage phasor in the current-limiting inductance between unit 1 and unit 2；ω is the voltage vector rotation that inverter provides Angular rate, j indicate imaginary unit；IAFor A phase line current phasor, IBFor B phase line current phasor.Similarly it is available other two The voltage loop equation of phase:
In formula, UBCIt is the alternate line voltage phasor of triple modular redundant AC side of converter B, C, UCAIt is triple modular redundant AC side of converter C, the alternate line voltage phasor of A；Ub2c2It is the alternate line voltage phasor of exchange side b2, c2 of unit 2 in triple modular redundant current transformer, Ub3c3It is The alternate line voltage phasor of exchange side b3, c3 of unit 3, U in triple modular redundant current transformerc2b3It is the current-limiting inductance between unit 2 and unit 3 On voltage phasor；Uc3a3It is the alternate line voltage phasor of exchange side c3, a3 of unit 3 in triple modular redundant current transformer, Uc1a1It is triple modular redundant The alternate line voltage phasor of exchange side c1, a1 of unit 1, U in current transformera3c1It is the electricity in the current-limiting inductance between unit 2 and unit 1 Press phasor；ICFor C phase line current phasor.
Available one equivalent threephase switch circuit from the above analysis, as shown in Figure 2.In figure, LfxBe it is equivalent after friendship Side inductance is flowed, expression formula is
In formula, kLFor LfWith LxBetween ratio, i.e.,
Since the exchange side line voltage of equivalent switch circuit is equal to the sum of two neighboring cascade VSC unit line voltage, then DC bus-bar voltage U after equivalentDc, eqEqual to twice Uav, UavIndicate the average value of 3 DC bus-bar voltages, i.e.,
Triple modular redundant LVC-VSC uses 3 SVPWM computing units, is respectively designated as SVPWM computing unit 1, SVPWM is calculated Unit 2 and SVPWM computing unit 3；They respectively correspond switching group 1, switching group 2 and switching group 3.Carry out phase shift SVPWM into When row modulation, due to the DC bus-bar voltage U after equivalentDc, eqEqual to twice Uav, each SVPWM generation unit is all made of 2Uav/ 3 make Mould for reference axis in space vector coordinate system is long, and control system is obtaining reference voltage vector UrefAfterwards, it need to be remake multiplied by 1/2 For the given reference voltage vector of each SVPWM generation unit, and then it can get one group of three-phase modulations wave.
In addition, the invention patent utilizes phase-shifting carrier wave thought, SVPWM computing unit 1 is labeled as carrier wave 1, SVPWM is calculated Carrier phase corresponding to unit 2 and computing unit 3 lags behind 11/3 carrier cycle of carrier wave, i.e. Ts/ 3, carrier wave 2 is obtained, Middle TsFor carrier cycle.Wherein, in each switching group corresponding A phase the modulating wave of bridge arm and 3 groups of carrier waves phase relation such as Fig. 3 institute Show.Numerical control system can be according to modulating wave SVPWM waveform corresponding with the generation of carrier wave size relation.

Claims (1)

1. a kind of phase-shifting carrier wave SVPWM method suitable for line voltage cascaded type triple modular redundant current transformer, special type are, first First, the corresponding number of each component units and phase sequence in line voltage cascaded type triple modular redundant current transformer are defined；The three-phase separate of definition unit 1 Not Wei a1, b1 and c1 phase, and between 120 ° of mutual deviation, the three-phase of unit 2 is respectively a2, b2 and c2, and between 120 ° of mutual deviation, it is single The three-phase of member 3 is respectively a3, b3 and c3, and between 120 ° of mutual deviation；The a1 phase bridge arm of selection unit 1 is whole as triple modular redundant current transformer The A phase bridge arm of body, B phase bridge arm of the b2 phase bridge arm of unit 2 as triple modular redundant current transformer entirety, the c3 phase bridge arm conduct of unit 3 The C phase bridge arm of current transformer entirety, and this three bridge arms are regarded as a switching group, it is labeled as switching group 1；Take the a2 phase of unit 2 A phase of the bridge arm as a new switching group, the b1 phase bridge arm of unit 1 are the B phase of new switching group, and the c2 phase bridge arm of unit 2 is new The C phase of switching group, defining the new switching group is switching group 2；Take the a3 phase bridge arm of unit 3 for the A phase of another new switching group, The b3 phase bridge arm of unit 3 is the B phase of in addition new switching group, and the c1 phase bridge arm of unit 1 is the C phase of in addition new switching group, the switch Group echo is switching group 3；
Secondly, switching group 1 may be regarded as a set of two level topological structure of three-phase, and it is modulated using two level SVPWM methods, And it is labeled as SVPWM computing unit 1；For switching group 2, two level SVPWM modulator approaches are also used, are calculated labeled as SVPWM The modulating wave of unit 2, SVPWM computing unit 2 is identical as modulating wave used in SVPWM computing unit 1, but carrier wave lags 1/3 and opens Close the period；For switching group 3, also use SVPWM method, be labeled as SVPWM computing unit 3, the modulating wave of SVPWM3 with Modulating wave used in SVPWM computing unit 1 is identical, but carrier wave lags 1/3 switch periods；Numerical control system can be according to modulating wave SVPWM waveform corresponding with the generation of carrier wave size relation；
It is influenced by line voltage cascaded type triple modular redundant converter structure feature, wherein modulating wave obtains in two level SVPWMs Take method specific as follows, since line voltage cascaded type triple modular redundant current transformer can be equivalent to a switching circuit, wherein after equivalent DC bus-bar voltage UDc, eqEqual to twice Uav, UavThe average value that DC bus-bar voltage is corresponded to for three groups of power cells, if respectively SVPWM generation unit is all made of 2Uav/ 3 as reference axis in space vector coordinate system mould it is long, then control system is according to after equivalent Switching circuit reference voltage vector U obtainedref, the given reference voltage that each SVPWM generation unit need to be re-used as multiplied by 1/2 Vector, and then can get one group of three-phase modulations wave.
CN201710927377.5A 2017-09-27 2017-09-27 Carrier phase-shifting SVPWM (space vector pulse width modulation) method suitable for line voltage cascaded triple converter Active CN109412440B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114142758A (en) * 2021-12-07 2022-03-04 浙江大学先进电气装备创新中心 Novel modulation method suitable for line voltage cascade type triple converter
CN114221562A (en) * 2020-09-03 2022-03-22 上海电力大学 Dynamic lower-limit-stuck direct-current side voltage control method of voltage source type converter
CN114257114A (en) * 2021-12-11 2022-03-29 中科华士电气科技南京有限公司 Three-level converter control method and system based on carrier phase shift modulation

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CN102739086A (en) * 2012-06-18 2012-10-17 天津工业大学 Method for controlling triple line-voltage cascaded (LVC) converter based on equivalent circuit model
CN104270023A (en) * 2014-06-23 2015-01-07 中国矿业大学(北京) Harmonic optimization and modulation method of multi-level converter
US20150008856A1 (en) * 2013-07-02 2015-01-08 Lsis Co., Ltd. Multi-level medium-voltage inverter
CN105915089A (en) * 2016-05-06 2016-08-31 浙江大学 MMC capacitor voltage equalization control method based on driving signal logic processing

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Publication number Priority date Publication date Assignee Title
CN102739086A (en) * 2012-06-18 2012-10-17 天津工业大学 Method for controlling triple line-voltage cascaded (LVC) converter based on equivalent circuit model
US20150008856A1 (en) * 2013-07-02 2015-01-08 Lsis Co., Ltd. Multi-level medium-voltage inverter
CN104270023A (en) * 2014-06-23 2015-01-07 中国矿业大学(北京) Harmonic optimization and modulation method of multi-level converter
CN105915089A (en) * 2016-05-06 2016-08-31 浙江大学 MMC capacitor voltage equalization control method based on driving signal logic processing

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Publication number Priority date Publication date Assignee Title
CN114221562A (en) * 2020-09-03 2022-03-22 上海电力大学 Dynamic lower-limit-stuck direct-current side voltage control method of voltage source type converter
CN114221562B (en) * 2020-09-03 2023-08-29 上海电力大学 Dynamic lower limit direct current side voltage control method for voltage source converter
CN114142758A (en) * 2021-12-07 2022-03-04 浙江大学先进电气装备创新中心 Novel modulation method suitable for line voltage cascade type triple converter
CN114142758B (en) * 2021-12-07 2023-05-19 浙江大学先进电气装备创新中心 Novel modulation method suitable for line voltage cascading type triple converter
CN114257114A (en) * 2021-12-11 2022-03-29 中科华士电气科技南京有限公司 Three-level converter control method and system based on carrier phase shift modulation

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