CN106787796A - A kind of hybrid cascade multilevel converter and its control method with part energy-storage units - Google Patents
A kind of hybrid cascade multilevel converter and its control method with part energy-storage units Download PDFInfo
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- CN106787796A CN106787796A CN201611184454.4A CN201611184454A CN106787796A CN 106787796 A CN106787796 A CN 106787796A CN 201611184454 A CN201611184454 A CN 201611184454A CN 106787796 A CN106787796 A CN 106787796A
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of hybrid cascade multilevel converter with part energy-storage units and its control method, using three-phase y-type structure, motor operation.It is identical per phase structure, by traditional uncontrollable rectifier unit and energy storage power cell Mixed cascading, voltage class is shared jointly.For the different running statuses of motor, using power Discrete control, distributed by two kinds of active and reactive powers between power cell and motor, storage and the recycling of motor regeneration energy are realized, while so that the vertical compression of two kinds of units is maintained at stability range.The present invention can be fully during recycling motor braking regeneration energy, and can effectively compensating motor start-up procedure when required momentary spike power.The converter has four quadrant running ability, and the motor driven systems for need to frequently open braking have energy-saving significance.Simultaneously as energy-storage units are without front end rectifier bridge, power device and phase-shifting transformer winding quantity are effectively reduced, reduce equipment volume and cost.
Description
Technical field
It is how electric the invention belongs to electric and electronic technical field, more particularly to a kind of Mixed cascading with part energy-storage units
Flat converter and its control method.
Background technology
For mesohigh large-size machine drive system, at present generally using traditional cascaded H-bridges multi-level converter.Per phase
Structure is identical, is formed using traditional uncontrollable rectifier cascade of power units, simple structure, it is easy to extension and replacing.But due to preceding
Hold diode limitation, motor braking produce regeneration energy cannot feedback, easily cause unit vertical compression pump liter.Simultaneously because level
Receipts or other documents in duplicate unit number is more, and input side phase-shifting transformer is bulky, and the number of windings is more and manufacturing process is complicated.With energy crisis
Increasingly serious, power conservation requirement is gradually stepped up.In recent years, super capacitor price is gradually reduced, and Regenerated energy is realized using energy-storage system
The recycling of amount turns into a kind of development trend.Therefore, on traditional Cascade H bridging parallel operation architecture basics, simply transformed,
Design it is a set of can not only realize motor regeneration energy stores recycle but also can meet original function converter it is significant.
The content of the invention
The present invention is directed to the problems of the prior art, there is provided a kind of many level of Mixed cascading with part energy-storage units become
Parallel operation and its control method, not only reduce the front-end rectifier and phase-shifting transformer winding quantity of conventional transducers, while can
Realize that motor regenerates the recycling of energy, effective energy-conservation.
The technical solution adopted for the present invention to solve the technical problems is：A kind of mixing with part energy-storage units is provided
Cascade multilevel converter, the hybrid cascade multilevel converter uses three-phase y-type structure, identical per phase structure, by not controlling
Rectification unit is formed with energy storage power cell Mixed cascading, and voltage class is shared jointly；Uncontrollable rectifier unit is by three-phase diode
Uncontrollable rectifier bridge, vertical compression electric capacity, H bridge inverters are constituted, and send into the alternating current of uncontrollable rectifier unit, are not controlled through three-phase diode whole
Stream bridging is changed to 6 pulse wave direct currents, through vertical compression capacitor filtering voltage stabilizing after, then the friendship that variable voltage variable frequency is transformed to by H bridge inverters
Stream electricity；Energy storage power cell is made up of super capacitor with H bridge inverters, and H bridges are attempted by after multiple super capacitor connection in series-parallel combinations
The DC side of inverter.Compared to traditional uncontrollable rectifier unit, energy storage power cell effectively reduces power without front end rectifier bridge
Device and phase-shifting transformer winding quantity.Uncontrollable rectifier unit number and energy storage power cell number should be opened according to motor, power
The parameters such as pass, vertical compression specifically set.
A kind of hybrid cascade multilevel converter control method with part energy-storage units is also provided in the present invention, including
Following steps, step one sets electric machine frequency and initial phase, and phase voltage amplitude is designed according to constant voltage constant frequency control method；Step
Two, motor terminal voltage and electric current are detected, calculate power factor angle；Step 3, obtains uncontrollable rectifier unit and energy storage power list
The Voltage Reference command signal of unit；Step 4, after being processed through phase-shifting carrier wave PWM, is respectively fed to energy storage power cell and not
Control each device for power switching of the H bridge inverters of rectification unit.
According to such scheme, the step 3 specifically, according to the phasor relation under three kinds of control models, draw do not control it is whole
The Voltage Reference command signal of stream unit and energy storage power cell, wherein three kinds of control models are specially：Control model one, works as electricity
When machine normally runs, energy storage power cell only provides reactive power, and uncontrollable rectifier unit provides whole active power and one
The reactive power divided；Control model two, when decelerating through motor runs, motor produces regeneration energy to be all fed back to energy storage power list
Unit, uncontrollable rectifier unit only exchanges reactive power；Control model three, when motor acceleration or electric operation again, sets criterion,
Energy storage power cell is discharged active power, energy needed for load is provided jointly with uncontrollable rectifier unit, small electromotor adds suddenly
Momentary spike power required when fast, treats that electric capacity vertical compression is down to setting value, and energy storage power cell stops exporting active, reworks
In normal condition, reactive power is only exchanged.
The beneficial effect comprise that：First, there be energy storage power cell in part without front end rectifier bridge in the present invention
Effect reduces power device and phase-shifting transformer winding quantity, reduces equipment manufacturing cost and volume.Second, the present invention is recyclable again
The regeneration energy produced using decelerating through motor or when carrying potential energy loading high, this energy can be used for small electromotor and start or accelerated
Momentary spike power required during journey, it can also be used to electric operation demand.The converter has four quadrant running ability, for needing
The motor driven systems for frequently opening braking have energy-saving significance.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the specific topology diagram of embodiment of the present invention converter；
Fig. 2 is the change of the energy storage power cell of every phase 2 and 2 uncontrollable rectifier unit Mixed cascading of embodiment of the present invention converter
Parallel operation A phase topology diagrams；
Fig. 3 is active, the reactive power distribution schematic diagram in the case of control model one between two power cells and motor；
Fig. 4 is active, the reactive power distribution schematic diagram in the case of control model two between two power cells and motor；
Fig. 5 is active, the reactive power distribution schematic diagram in the case of control model three between two power cells and motor；
Fig. 6 is that the every phase output voltage of the situation downconverter of control model one, electric current and two kinds of power cell voltage phasors are closed
System；
Fig. 7 is that the every phase output voltage of the situation downconverter of control model two, electric current and two kinds of power cell voltage phasors are closed
System；
Fig. 8 is that the every phase output voltage of the situation downconverter of control model three, electric current and two kinds of power cell voltage phasors are closed
System；
Fig. 9 is embodiment of the present invention hybrid cascade multilevel converter control method master control block diagram.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the present invention, not
For limiting the present invention.
In the embodiment of the present invention, a kind of hybrid cascade multilevel converter with part energy-storage units is provided first, should
Hybrid cascade multilevel converter uses three-phase y-type structure, identical per phase structure, by uncontrollable rectifier unit and energy storage power list
First Mixed cascading is formed, and voltage class is shared jointly；Uncontrollable rectifier unit is by three-phase diode uncontrollable rectifier bridge, vertical compression electric capacity, H
Bridge inverter is constituted, and sends into the alternating current of uncontrollable rectifier unit, and 6 pulse wave direct currents are changed to through three-phase diode uncontrollable rectifier bridging
Electricity, through vertical compression capacitor filtering voltage stabilizing after, then the alternating current that variable voltage variable frequency is transformed to by H bridge inverters；Energy storage power cell by
Super capacitor is constituted with H bridge inverters, and the DC side of H bridge inverters is attempted by after multiple super capacitor connection in series-parallel combinations.Compare
Traditional uncontrollable rectifier unit, energy storage power cell without front end rectifier bridge, effectively reduce power device and phase-shifting transformer around
Group quantity.
A kind of hybrid cascade multilevel converter control method with part energy-storage units is also provided in the present invention, including
Following steps, step one sets electric machine frequency and initial phase, and phase voltage amplitude is designed according to constant voltage constant frequency control method；Step
Two, motor terminal voltage and electric current are detected, calculate power factor angle；Step 3, obtains uncontrollable rectifier unit and energy storage power list
The Voltage Reference command signal of unit；Step 4, after being processed through phase-shifting carrier wave PWM, is respectively fed to energy storage power cell and not
Control each device for power switching of the H bridge inverters of rectification unit.
Further, the step 3 is specifically, according to the phasor relation under three kinds of control models, draw uncontrollable rectifier list
Unit and the Voltage Reference command signal of energy storage power cell, wherein three kinds of control models are specially：Control model one, when motor just
Often during operation, energy storage power cell only provides reactive power, and uncontrollable rectifier unit provides whole active power with a part
Reactive power；Control model two, when decelerating through motor runs, motor produces regeneration energy to be all fed back to energy storage power cell,
Uncontrollable rectifier unit only exchanges reactive power；Control model three, when motor acceleration or electric operation again, sets criterion, makes
Energy storage power cell discharges active power, and energy needed for load is provided jointly with uncontrollable rectifier unit, and small electromotor accelerates suddenly
The momentary spike power of Shi Suoxu, treats that electric capacity vertical compression is down to setting value, and it is active that energy storage power cell stops output, rework in
Normal condition, only exchanges reactive power.
Uncontrollable rectifier unit and the energy storage equal flexibly configurable of power cell number, specific design is according to capacity motor, device
The parameter such as power and vertical compression is calculated in detail.
Embodiment of the present invention hybrid cascade multilevel converter control method is directed to the different running statuses of motor, using work(
Rate Discrete control, distributes by two kinds of active and reactive powers between power cell and motor, realizes motor regeneration energy
Storage and recycling, while so that the vertical compression of two kinds of units is maintained at stability range.The present invention can abundant recycling motor
Regeneration energy in braking procedure, and can effectively compensating motor start-up procedure when required momentary spike power.The conversion utensil
There is four quadrant running ability, the motor driven systems for need to frequently open braking have energy-saving significance.Simultaneously as energy-storage units
Without front end rectifier bridge, power device and phase-shifting transformer winding quantity are effectively reduced, reduce equipment volume and cost.
Shown in reference picture 1, a kind of hybrid cascade multilevel converter with part energy-storage units, per mutually m storage of design
Energy power cell is formed with n diode uncontrollable rectifier cascade of power units.A, B, C three-phase constitute y-type structure for motor is powered.
Two kinds of numbers of power cell are comprehensively set by the capacitance grade of motor rated power, feedback power and power device in converter
It is fixed.All uncontrollable rectifier unit input sides are connected by phase-shifting transformer with power network.
Shown in reference picture 2, opened up with the converter A phases of 2 energy storage power cell Mixed cascading per 2 uncontrollable rectifier units of phase
Flutter, A1, A2 are energy storage power cell in figure, A3, A4 are uncontrollable rectifier unit.Energy storage power cell is inverse with H bridges by super capacitor
Become device to constitute, uncontrollable rectifier unit is made up of three-phase diode uncontrollable rectifier bridge, vertical compression electric capacity, H bridge inverters.Now phase shift becomes
Depressor secondary side winding quantity reduces half relative to conventional transducers, and phase shift angle is followed successively by 0 °, 30 °, with it is traditional ±
22.5 °, ± 7.5 ° are compared, process complexity reduction.
Shown in reference picture 3-5, three kinds of control models, the active reactive power distribution relation between two power cells and motor：
Control model one, when motor normally runs, energy storage power cell only provides reactive power, and uncontrollable rectifier unit provides whole
The reactive power of active power and a part；Control model two, when decelerating through motor runs, motor produces regeneration energy all to return
Energy-storage units are fed to, uncontrollable rectifier unit only exchanges reactive power；Control model three, when motor accelerates or electric operation again
When, criterion is set, energy storage power cell is discharged active power, energy needed for load is provided jointly with uncontrollable rectifier unit, mend
Repay momentary spike power required when motor accelerates suddenly.Treat that electric capacity vertical compression is down to setting value, energy storage power cell stops output
It is active, rework in normal condition, only exchange reactive power.
Shown in reference picture 6-8, three kinds of control model active reactive power distribution thoughts of correspondent transform device, design is per mutually output
Voltage, electric current and two kinds of power cell voltage phasor relations.In figureRespectively A phases output voltage, electric current phasor, It is A phase energy storage power cell, total output voltage phasor of uncontrollable rectifier unit.θ is the advanced A of energy storage power cell output voltage
Phase voltage angle, β is not control the delayed A phase voltages angle of unit output voltage,Angle is electric current phasorLagging voltage phasorAngle
Degree.Control model one, to maintain vertical compression stabilization, energy storage power cell only exchanges reactive power, therefore energy storage power cell should be made defeated
Go out voltage phasorWith electric current phasorVertically.Control model two, decelerating through motor on-position,To make regeneration energy complete
Portion is fed back to energy-storage units, unit is not controlled and only exchanges reactive power, should makeControl model three, to deposit energy-storage units
The regeneration energy of storage can be recycled, phasorWith phase currentAngle γ should be acute angle, energy-storage units is aided in output one
Fixed active power.Thus according to trigonometric function relation, it may be determined that two kinds of power cell voltages and single-phase voltage amplitude and phase
Angular relationship.
It is the inventive method master control block diagram shown in reference picture 9.Step one, sets electric machine frequency and initial phase, according to perseverance
Voltage-frequency is than design of control method phase voltage amplitude；Step 2, detection motor terminal voltage and galvanometer calculate power factor angle；Step
Three, according to the phasor relation under three kinds of control models, show that uncontrollable rectifier unit is instructed with the Voltage Reference of energy storage power cell
Signal；Step 4, after being processed through phase-shifting carrier wave PWM, the H bridges for being respectively fed to energy storage power cell and uncontrollable rectifier unit are inverse
Become each device for power switching of device.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (3)
1. a kind of hybrid cascade multilevel converter with part energy-storage units, it is characterised in that many level of the Mixed cascading
Converter uses three-phase y-type structure, identical per phase structure, by uncontrollable rectifier unit and energy storage power cell Mixed cascading
Into sharing voltage class jointly；Uncontrollable rectifier unit is by three-phase diode uncontrollable rectifier bridge, vertical compression electric capacity, H bridge inverter structures
Into, the alternating current of uncontrollable rectifier unit is sent into, 6 pulse wave direct currents are changed to through three-phase diode uncontrollable rectifier bridging, through vertical compression electricity
After capacitor filter voltage stabilizing, then the alternating current that variable voltage variable frequency is transformed to by H bridge inverters；Energy storage power cell is by super capacitor and H
Bridge inverter is constituted, and the DC side of H bridge inverters is attempted by after multiple super capacitor connection in series-parallel combinations.
2. a kind of hybrid cascade multilevel converter control method with part energy-storage units, it is characterised in that including following
Step, step one sets electric machine frequency and initial phase, and phase voltage amplitude is designed according to constant voltage constant frequency control method；Step 2, inspection
Measured motor terminal voltage and electric current, calculate power factor angle；Step 3, obtains the electricity of uncontrollable rectifier unit and energy storage power cell
Pressure reference instruction signal；Step 4, after being processed through phase-shifting carrier wave PWM, is respectively fed to energy storage power cell and uncontrollable rectifier
Each device for power switching of the H bridge inverters of unit.
3. the hybrid cascade multilevel converter control method with part energy-storage units according to claim 2, it is special
Levy and be, the step 3 is specifically, according to the phasor relation under three kinds of control models, draw uncontrollable rectifier unit and energy storage work(
The Voltage Reference command signal of rate unit, wherein three kinds of control models are specially：Control model one, when motor normally runs,
Energy storage power cell only provides reactive power, and uncontrollable rectifier unit provides whole active power and a part of reactive power；
Control model two, when decelerating through motor runs, motor produces regeneration energy to be all fed back to energy storage power cell, uncontrollable rectifier list
Unit only exchanges reactive power；Control model three, when motor acceleration or electric operation again, sets criterion, makes energy storage power list
Unit's release active power, energy needed for load, required wink when small electromotor accelerates suddenly are provided with uncontrollable rectifier unit jointly
When peak power, treat that electric capacity vertical compression is down to setting value, it is active that energy storage power cell stops output, reworks in normal condition,
Only exchange reactive power.
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| CN107947682A (en) * | 2017-12-15 | 2018-04-20 | 华中科技大学 | The three phase alternating current motor drive system and method for a kind of suppression common mode noise |
| CN108736470A (en) * | 2018-06-01 | 2018-11-02 | 广东工业大学 | A kind of cascade converter and interlock circuit of variable frequency transformer circuit |
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