CN108448923A - A kind of method for controlling frequency conversion for realizing three-phase inverter Sofe Switch - Google Patents
A kind of method for controlling frequency conversion for realizing three-phase inverter Sofe Switch Download PDFInfo
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- CN108448923A CN108448923A CN201810309735.0A CN201810309735A CN108448923A CN 108448923 A CN108448923 A CN 108448923A CN 201810309735 A CN201810309735 A CN 201810309735A CN 108448923 A CN108448923 A CN 108448923A
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- sofe switch
- phase inverter
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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
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
A kind of method for controlling frequency conversion for realizing three-phase inverter Sofe Switch disclosed by the invention belongs to the non-isolated HF power conversion direction of field of power electronics.By the present invention in that with obtained three-phase inverter power network current and voltage and calculated modulating wave information, prediction three-phase inverter side inductive current pulsation is sampled.In each space vector sector, regulating switch frequency to be most difficult to realize that phase inductance pulsation of current size of Sofe Switch is maintained at the state for just realizing Sofe Switch in three-phase inverter, to reduce switching loss.At this point, wherein other phase most of the time Sofe Switch realization is more abundant.Mutually on off state is constant in entire sector for last, without realizing Sofe Switch.The technical problem to be solved in the present invention is to realize all switching tube wide scope Sofe Switch of three-phase inverter by digital frequency control, and reduce the pulsation of current under three-phase inverter underloading and circulation loss, improves the transfer efficiency and power density of three-phase inverter.
Description
Technical field
The present invention relates to a kind of method for controlling frequency conversion being applied to three-phase voltage source type inversion (rectification) device, belong to electric power electricity
The non-isolated HF power conversion direction of subdomains.
Background technology
Nowadays three-phase voltage source inverter is widely used in all types of industries equipment and commercial device, such as uninterruptible power supply
(UPS), electric automobile charging pile and photovoltaic parallel in system etc..Its most common topological structure is the three-phase bridge electricity of two level
Road.It is simple in structure symmetrical, the seamless switching between inversion and rectification may be implemented, and by prolonged development, nowadays
Contral ripening is reliable.However for two switching tubes up and down of each bridge arm, at any time according to its inductive current
Flow direction, only one of which switching tube may be implemented soft open-minded, this makes switching loss greatly increase.In high-power applications
In, switching frequency must not be not provided with very low to reduce switching loss.Alternating current aberration rate can be improved by doing so, and need to increase
Filter makes up, and not only reduces the dynamic responding speed of inverter, and make whole system bulky, power density
It reduces.
In order to reduce the switching loss of inverter, the method that scholar proposes many inverter soft switchings is included in DC side
Or each bridge arm of exchange side increases auxiliary circuit so that the current direction of superposition can change in each switch periods.In upper tube
When opening, inductive current flows into bridge arm midpoint, and when down tube is opened, inductive current flows out bridge arm midpoint, you can keeps down tube all real
Existing Sofe Switch.Due to can all increase the cost and volume of inverter using the method for auxiliary circuit, while excess loss is will produce,
It is more simple and reliable efficiently that there is no need to the methods of auxiliary circuit.
Most straightforward approach is the very little for designing inverter side inductance value, increases pulsation of current, and it is soft to be allowed to nature realization
Switch.But it in order to avoid occurring unnecessary super-high-current pulsation under different loads, needs to reduce circulation using frequency control
Loss.This method has been used in single-phase inverter, and opening for switching tube is controlled using inductive current zero cross detection circuit
Logical and shutdown.Such as：IEEE Journal of Emerging and Selected Topics in Power
Electronics【The emerging and selected theme periodical of power electronics】In " the Digital-Based that 2016 deliver
Interleaving Control for GaN-Based MHz CRM Totem-Pole PFC,【MHz numbers based on GaN device
Word critical current Interleaved control totem PFC】The method for using current over-zero detection realizes Sofe Switch and the frequency conversion control of device
System, two bridge arm Interleaved controls can offset portion of electrical current pulsation, even if very little if switching frequency reaches MHz switching losses.
The above method can be applied to single-phase inverter, however in three-phase inverter, since three-phase current is mutually coupled,
Current waveform is influenced by each bridge arm on off state, it is difficult to ensure that all switching tubes can realize Sofe Switch simultaneously.Therefore
It needs to use special modulation system so that while only there are two bridge arms to be in HF switch state, and there are one bridge arms to keep
On off state is constant.It only needs to consider that can the switching tube in HF switch realize Sofe Switch in this way.In IEEE
Energy Conversion Congress and Exposition(ECCE)【Energy converts fair】It delivers within 2017
" Critical-mode-based soft-switching modulation for three-phase inverters ",【Three
The critical current mode switch of phase inverter is modulated】Still current over-zero detection method is used, however due to threephase switch frequency
Rate will be unified, it is therefore desirable to select a phase that switching frequency is made to synchronize.Its modulation system is DPWM (interrupted space vector), and according to
So in such a way that bridge arm interlocks.However since digital control and simulation zero cross detection circuit needs are used in conjunction with, increase multiple
Polygamy.
Invention content
The purpose of the present invention is to solve conventional three-phase voltage source inverters (since inverter generally can also realize rectification
Function, therefore following writing inverter) it cannot achieve all switching tube wide scope Sofe Switch when unity power factor is run
The problem of, a kind of method for controlling frequency conversion for realizing three-phase inverter Sofe Switch is provided, three-phase is realized by digital frequency control
All switching tube wide scope Sofe Switch of inverter, and reduce the pulsation of current under three-phase inverter underloading and circulation loss, it improves
The transfer efficiency and power density of three-phase inverter.
The purpose of the present invention is what is be achieved through the following technical solutions.
A kind of method for controlling frequency conversion for realizing three-phase inverter Sofe Switch disclosed by the invention is obtained by using sampling
Three phase network electric current and voltage and calculated modulating wave information, prediction three-phase inverter side inductive current pulsation.Each
Space vector sector, regulating switch frequency to be most difficult to realize that phase inductance pulsation of current of Sofe Switch is big in three-phase inverter
It is small to be maintained at the state for just realizing Sofe Switch, to reduce switching loss.At this point, the wherein other phase most of the time soft opens
It is more abundant to close realization.Mutually on off state is constant in entire sector for last, without realizing Sofe Switch.
A kind of method for controlling frequency conversion for realizing three-phase inverter Sofe Switch disclosed by the invention, for realizing three-phase inverter
Sofe Switch, the three-phase inverter include DC power supply, three-phase bridge circuit and filter, include up and down per phase bridge circuit
The drive signal of two groups of switching tubes, upper and lower two groups of switching tubes is complementary, and drive signal contains certain dead time.Three contraries
Unity power factor inversion or rectification mode need to be operated in by becoming device.The three-phase inverter is as three-phase converter system
Main circuit, the three-phase converter system further includes digitial controller, sample circuit and driving circuit.Sample circuit
For Sample AC side three-phase voltage and current instantaneous value va,vb,vc,ia,ib,ic。
Preferably, filter uses LCL structures, wherein three-phase inverter side inductance value is L1, capacitance C, exchange
Side inductance value is L2。
A kind of method for controlling frequency conversion for realizing three-phase inverter Sofe Switch disclosed by the invention, includes the following steps：
Step 1: sampling three-phase network voltage va, vb, vcWith three phase network electric current ia, ib, icFilter out the wink after switching harmonics
Duration.Due to the symmetry of power grid, in order to reduce cost, the arbitrary two-phase value in sampling three-phase network voltage and electric current is only needed,
An other phase voltage and electric current can be found out by other two-phases.By digital control circuit to electric network voltage phase carry out in real time with
Track.
Step 2: carrying out d/q principal axis transformations to three phase network electric current, closed loop control is carried out to grid-connected current using digitial controller
System.In order to avoid the resonance problems of LCL filter, active damping control, i.e. bandpass digital filter may be used, filter out three-phase
Modulating wave ma,mb,mcIn harmonic frequency components.And use five-part form space vector modulation.The wherein described five-part form space vector
Modulation can from following two methods optional one：The zero vector of the first is that three-phase bridge upper tube all turns on, the zero of second
Vector is that three-phase bridge down tube all turns on.The three-phase modulations wave information m controlled using digitial controller internal closed loopa,mb,
mc, calculate switching frequency fs, calculation formula is
Wherein IbiasIt is to be determined according to the output capacitance size of switching tube to realize the bias current of Sofe Switch.For
The first five-part form space vector modulation, the state of each sector is as shown in Table 1,
Each phase state of one the first space vector of table
| Sector | 1 | 2 | 3 | 4 | 5 | 6 |
| X corresponds to phase | c | c | a | a | b | b |
| On off state is not covert | a | b | b | c | c | a |
| Sofe Switch partial loss phase | b | a | c | b | a | c |
For second of five-part form space vector modulation, the state of each sector is as shown in Table 2,
Each phase state of second of the space vector of table 2
Step 3: adjusting carrier frequency in the digitial controller of digital control circuit, the carrier frequency is step 2
Calculating switching frequency fs, modulation ratio is not by switching frequency fsIt influences.The switching signal of gained is passed into driving circuit and is driven
Corresponding switching tube realizes all switching tube wide scope Sofe Switch by digital frequency control.
Advantageous effect：
1, three-phase inverter Sofe Switch in the prior art is to lean on additional auxiliary circuit, sensor and current over-zero detection
What circuit was achieved, a kind of method for controlling frequency conversion for realizing three-phase inverter Sofe Switch disclosed by the invention passes through frequency conversion control
System realizes the Sofe Switch of three-phase inverter, therefore need not lean on additional auxiliary circuit, sensor and current over-zero detection circuit.
2, a kind of method for controlling frequency conversion for realizing three-phase inverter Sofe Switch disclosed by the invention, switching frequency fsPass through institute
The frequency calculation formula (1) of proposition provides, by calculation formula (1) it is found that under any fixed operating condition, a power frequency week
Switching frequency f in phasesVariation range only has about 1.5 times or so, is suitble to work under width load and wide-voltage range.
4, a kind of method for controlling frequency conversion for realizing three-phase inverter Sofe Switch disclosed by the invention, due to realizing three-phase inversion
The wide scope Sofe Switch of all switching tubes of device, and in half of power frequency period, three-phase inverter has phase bridge arm switch always
Pipe is failure to actuate, therefore can greatly reduce the switching loss of three-phase inverter, improves transfer efficiency so that switching frequency is further
It improves, and since the filter inductance value of use is smaller, whole inverter is small, power density is high.
5, a kind of method for controlling frequency conversion for realizing three-phase inverter Sofe Switch disclosed by the invention, due to using smaller filtering
The inductance value of device increases pulsation of current, can improve the cutoff frequency of inverter, and switching frequency can greatly improve, because
The dynamic response effect of this system is preferable, and stability is not influenced by frequency control, still can under impact and anticlimax loading condition
Enough ensure the realization of the normal work and Sofe Switch of inverter.
Description of the drawings
Fig. 1 is three-phase voltage source inverter main circuit；
Fig. 2 is the frequency control block diagram of three-phase inverter Sofe Switch；
Fig. 3 is the switching frequency variation tendency in a power frequency period；
Fig. 4 is the relationship of highest and lowest switching frequency and inverter power and DC voltage in power frequency period；
Fig. 5 is the typical waveform in power frequency period.
Specific implementation mode
The present invention is described in detail below in conjunction with drawings and examples.Also describe technical solution of the present invention simultaneously
The technical issues of solution and advantageous effect, it should be pointed out that described embodiment is intended merely to facilitate the understanding of the present invention,
And any restriction effect is not played to it.
Embodiment 1：
Use accumulator for the DC power supply of three-phase inverter in the present embodiment, accumulator DC presses 350~400V, hands over
Galvanic electricity net is three-phase phase voltage virtual value 110V, rated power 3500W, it can be achieved that the grid-connected charge and discharge of unity power factor, can use
In uninterruptible power supply or electric automobile battery charger.
Three-phase inverter main circuit structure is as shown in Figure 1.Including three-phase half-bridge, totally 6 switching tubes, all switching tubes
Select SiC device.The midpoint of three-phase bridge is connect with LCL filter respectively.Inverter side inductance value is L1, capacitance C, electricity
Net side inductance value is L2.Design lowermost switch frequency fsIt is limited to 100kHz.Therefore for inverter in minimum voltage 350V, maximum is negative
It carries under lower 3500W, switching frequency fs100kHz is should be, L can be obtained1Inductance value be 10 μ H.Capacitance C is small as possible, to subtract
Small reactive current is typically designed the active power that reactive power is less than 2%, and capacitance selects the high frequency capacitance of 4.7 μ F in practice.Electricity
Net side inductance be in order to reduce the distortion of grid-connected current, since switching frequency is higher, current distortion rate be 5% requirement under,
Inductance value L2Only need 20 μ H.And due to using frequency control, in fact, pulsation of current can be much smaller than 5%.Number in the present embodiment
It is TMS320F28335 chips that word controller, which is selected,.
Fig. 2 is a kind of frequency control block diagram for realizing three-phase inverter Sofe Switch disclosed in the present embodiment, and the present embodiment is public
A kind of method for controlling frequency conversion that realizing three-phase inverter Sofe Switch opened, specific implementation step are as follows：
Step 1: sampling three-phase network voltage va, vb, vcWith three phase network electric current ia, ib, icAfter filtering out switching frequency component
Instantaneous value.By digitial controller to network voltage into horizontal lock.
Step 2: carrying out d/q principal axis transformations to three phase network electric current, closed loop control is carried out to grid-connected current using digitial controller
System.In order to avoid the resonance problems of LCL filter, active damping control, i.e. bandpass digital filter may be used, filter out three-phase
Modulating wave ma,mb,mcIn harmonic frequency components.And use five-part form space vector modulation.The wherein described five-part form space vector
Modulation can from following two methods optional one：The zero vector of the first is that three-phase bridge upper tube all turns on, the zero of second
Vector is that three-phase bridge down tube all turns on.The three-phase modulations wave information m controlled using digitial controller internal closed loopa,mb,
mc, switching frequency f can be calculated according to formula (1)s, calculation formula is
Wherein IbiasIt is to realize the bias current of Sofe Switch, it is contemplated that selected device junction capacity is smaller, but in order to full
Foot can still ensure that Sofe Switch is not lost when dynamically cutting load, bias current IbiasIt is designed as 2A.The correspondence shape of each sector
State is determined according to table one and table two.
Step 3: adjusting the calculating switching frequency f that carrier frequency is step 2 in digitial controllers, modulation ratio not by
Switching frequency fsIt influences.The switching signal of gained is passed into driving circuit and drives corresponding switching tube, dead band time setting
For 100ns, i.e., all switching tube wide scope Sofe Switch are realized by digital frequency control, there are one switches in each sector
The section that 10 degree or so of Guan Yue cannot achieve Sofe Switch.
After using variable frequency control, the switching frequency variation tendency in a power frequency period is as shown in figure 3, visible frequencies are continuous
It is smooth.Under different voltages and loading condition, the minimum and maximum switching frequency in power frequency period is as shown in Figure 4, it can be seen that
Load is lighter, and voltage is higher, and switching frequency is higher.And in any condition, switching frequency variation range only has about 1.5 times.
Fig. 5 is illustrated in a power frequency period, the input of 350V direct currents, the waveform under inverter mode.The electricity of inverter side
Inducing current has higher pulsation of current, but power network current is almost without pulsation.And in the first sector (0 to 60 degree), c phase currents
Envelope is fixed as 2A, is consistent with design.All switching tubes of c phases can be completely achieved Sofe Switch.And b phases are only in about 50 to 60 degree
Section inner upper tube cannot achieve Sofe Switch, all devices of other times can all realize Sofe Switch.Since a phase on off states are kept
Constant, there is no need to consider that its Sofe Switch realizes situation.In other sectors, the relationship alternating between three-phase.The reality of all switches
The average time of existing Sofe Switch accounts for about the 95.8% of master switch number.
The purpose, technical solution and advantageous effect of invention is further elaborated in above-described specific descriptions,
It should be understood that the above is only a specific embodiment of the present invention, it is not intended to limit the scope of protection of the present invention,
All within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention's
Within protection domain.
Claims (2)
1. a kind of method for controlling frequency conversion for realizing three-phase inverter Sofe Switch, described for realizing three-phase inverter Sofe Switch
Three-phase inverter includes DC power supply, three-phase bridge circuit and filter, includes upper and lower two groups of switching tubes per phase bridge circuit, on
The drive signal of lower two groups of switching tubes is complementary, and drive signal contains certain dead time；Three-phase inverter need to operate in
Unity power factor inversion or rectification mode；Main circuit of the three-phase inverter as three-phase converter system, institute
The three-phase converter system stated further includes digital control circuit, sample circuit and driving circuit；Sample circuit is for sampling
Exchange side three-phase voltage and current instantaneous value va,vb,vc,ia,ib,ic；It is characterized in that：Include the following steps：
Step 1: sampling three-phase network voltage va, vb, vcWith three phase network electric current ia, ib, icIt filters out instantaneous after switching harmonics
Value；Due to the symmetry of power grid, in order to reduce cost, the arbitrary two-phase value in sampling three-phase network voltage and electric current is only needed, separately
An outer phase voltage and electric current can be found out by other two-phases；By digital control circuit to electric network voltage phase carry out in real time with
Track；
Step 2: d/q axis decomposition is carried out to three phase network electric current, using grid-connected current closed-loop control and five-part form space vector tune
System；Wherein described five-part form space vector modulation optional one from following two methods：The zero vector of the first is three-phase bridge
Upper tube all turns on, and second of zero vector is that three-phase bridge down tube all turns on；It is controlled using digitial controller internal closed loop
The three-phase modulations wave information m arriveda,mb,mc, calculate switching frequency fs, calculation formula is
Wherein IbiasIt is to be determined according to the output capacitance size of switching tube to realize the bias current of Sofe Switch；For the first
The state of five-part form space vector modulation, each sector is as shown in Table 1,
Each phase state of one the first space vector of table
For second of five-part form space vector modulation, the state of each sector is as shown in Table 2,
Each phase state of second of the space vector of table 2
Step 3: adjusting carrier frequency in the digitial controller of digital control circuit, the carrier frequency is the meter of step 2
Calculate switching frequency fs, modulation ratio is not by switching frequency fsIt influences；The switching signal of gained is passed into driving circuit and drives correspondence
Switching tube, that is, pass through digital frequency control and realize all switching tube wide scope Sofe Switch.
2. a kind of method for controlling frequency conversion for realizing three-phase inverter Sofe Switch as described in claim 1, it is characterised in that：Filtering
Device is LCL structures, and wherein three-phase inverter side inductance value is L1, capacitance C, inductance value at alternating side L2。
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| CN201810309735.0A CN108448923B (en) | 2018-04-09 | 2018-04-09 | Frequency conversion control method for realizing soft switch of three-phase inverter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112134443A (en) * | 2020-09-17 | 2020-12-25 | 西安交通大学 | Soft switch implementation and self-adaptive control method based on critical conduction mode |
| CN113315391A (en) * | 2021-04-29 | 2021-08-27 | 武汉华海通用电气有限公司 | Digital PFC circuit |
| CN113541522A (en) * | 2021-07-22 | 2021-10-22 | 河北工业大学 | Control method for realizing four-quadrant operation full-range soft switching of three-phase inverter |
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| CN104009620A (en) * | 2014-06-16 | 2014-08-27 | 南京航空航天大学 | Control type soft-switching technology for inverter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112134443A (en) * | 2020-09-17 | 2020-12-25 | 西安交通大学 | Soft switch implementation and self-adaptive control method based on critical conduction mode |
| CN113315391A (en) * | 2021-04-29 | 2021-08-27 | 武汉华海通用电气有限公司 | Digital PFC circuit |
| CN113541522A (en) * | 2021-07-22 | 2021-10-22 | 河北工业大学 | Control method for realizing four-quadrant operation full-range soft switching of three-phase inverter |
| CN113541522B (en) * | 2021-07-22 | 2022-06-07 | 河北工业大学 | Control method for realizing four-quadrant operation full-range soft switching of three-phase inverter |
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| CN108448923B (en) | 2020-01-03 |
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