CN105391328B - A kind of hysteresis control method thereof of three-level inverter - Google Patents
A kind of hysteresis control method thereof of three-level inverter Download PDFInfo
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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
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Abstract
The present invention discloses a kind of hysteresis control method thereof of three-level inverter, this method is by calculating inverter bridge actual output current change rate, instruction current change rate, lowermost switch frequency is limited, and by comparing judgement, directly calculates three-level inverters and needs the level state exported.The present invention realizes the reliable current hysteresis loop tracking control to three-level inverter, limits the lowermost switch frequency of three-level inverter Hysteresis control, ensure that three-level inverter current tracking effect, improve inverter performance；Solves the problem of traditional Hysteresis control three-level inverter is too low in output voltage near zero-crossing point switching frequency, and output current is caused to distort.
Description
Technical field
The present invention relates to three-level inverter control technology field more particularly to a kind of Hysteresis controls of three-level inverter
Method.
Background technology
Hysteresis control is a kind of control method based on current temporary state, and dynamic response is fast, robustness is good, hardware circuit is simple
List, real-time is good, control accuracy is higher, has a wide range of applications in field of inserter control.The operation principle of Hysteresis control is such as
Shown in Fig. 1, by the electric current i of inverter bridge reality outputLWith instruction current irefDifference input hysteresis comparator, compare through stagnant ring
Device generates pwm pulse drive signal to control the break-make of switching device in main circuit, to realize that inverter bridge output current tracks
The purpose of current command signal variation.
Three-level inverter has the characteristics that efficient, output ripple is small, switching frequency is high, and three-level inverter structure is shown
Meaning such as Fig. 2.When hysteretic loop current control is applied to three-level inverter and controls, the common tracking and controlling method of tradition is by will be defeated
The polarity for going out side voltage determines the output level of three-level inverters as additional conditions, when output voltage is positive polarity,
Inverter bridge output positive level and zero level are selected, when outlet side voltage is negative polarity, inverter bridge is selected to export negative level and zero
Level.When Hysteresis control selects fixed ring width control, the switching frequency of converter bridge switching parts device can change in very large range,
This will influence filter effect of the output filter to switching harmonics, and leading to inverter outlet side, there are harmonic waves.Especially in electricity
For net voltage in zero crossings, switching frequency can be very often low, and output current can be caused to generate distortion, lead to the excellent of hysteresis control method thereof
There is no give full play to gesture in three-level inverter.
Invention content
It is an object of the invention to by a kind of hysteresis control method thereof of three-level inverter, to solve background above technology
The problem of part is mentioned.
For this purpose, the present invention uses following technical scheme：
A kind of hysteresis control method thereof of three-level inverter, specifically includes：
S101, the electric current i when inverter bridge reality outputLWith instruction current irefDifference DELTA i be less than negative sense ring width (- H)
When, calculate inverter bridge actual output current iLChange rate, instruction current irefChange rate, setting limitation time Tlmt, by comparing
Judge, three-level inverters is selected to need to export positive level U+Or zero level state, make the electric current i of inverter bridge reality outputLOn
It rises；
S102, the electric current i when inverter bridge reality outputLWith instruction current irefDifference DELTA i be more than forward direction ring width (H) when,
Calculate inverter bridge actual output current iLChange rate, instruction current irefChange rate, setting limitation time Tlmt, sentence by comparing
It is disconnected, select three-level inverters to need to export negative level U-Or zero level state, make the electric current i of inverter bridge reality outputLDecline.
Particularly, the step S101 is specifically included：If in t0Position, the electric current i of inverter bridge reality outputLWith instruction electricity
Flow irefDifference DELTA i be less than negative sense ring width (- H), then change the output state of inverter bridge, make the electric current of inverter bridge reality output
iLRise；To ensure the tracking accuracy of inverter, electric current i need to be limitedLRise time ton, tonLimitation time T cannot be more thanlmt；
Instruction current irefChange rate beIn rise time tonIn time, irefVariation delta irefForIn rise time tonIt is interior, due to instruction current irefSize has changed Δ iref, the upper ring i of stagnant ringupWith lower ring
idownSize changed Δ i respectivelyref；Inverter bridge actual output current iLChange rate beIt is in tonIn time, iL's
Variation delta iLRespectivelyIn rise time tonIt is interior, if electric current iLIt can be from ring i under stagnant ringdownChange to ring iup,
ΔiLNeed variation 2 × H+ Δs iref, i.e.,
To make the electric current i of inverter bridge reality outputLRise, optional inverter bridge output state has positive level U+Or zero level two
Kind state：
When selected inverter bridge output positive electricity level state, electric current iLRate of change beWherein uoIt is inverse for three level
Become device output voltage, L is series inductance after three-level inverters；When selected inverter bridge output zero level state, electric current iLChange
Changing rate isElectric current i when selected inverter bridge output positive levelLClimbing when being more than selected inverter bridge and exporting zero level
Electric current iLClimbing；
Electric current i when if inverter bridge selectes output zero levelLIt can be in limitation time TlmtIt is interior to reach ring, then it selectes
Inverter bridge output zero level state is to ensure that the lowermost switch frequency of converter bridge switching parts pipe, and then ensures the tracking of inverter
Otherwise precision selectes inverter bridge and exports positive electricity level state, that is, works asWhen, select inverter bridge
Zero level state is exported, inverter bridge is otherwise selected and exports positive electricity level state.
Particularly, the step S102 is specifically included：If in t1Position, the electric current i of inverter bridge reality outputLWith instruction electricity
Flow irefDifference DELTA i be more than positive ring width (H), then change the output state of inverter bridge, make the electric current i of inverter bridge reality outputL
Decline；To ensure the tracking accuracy of inverter, electric current i need to be limitedLFall time toff, toffLimitation time T cannot be more thanlmt；
Instruction current irefChange rate beIn fall time toffIn time, irefVariation delta irefForIn fall time toffIt is interior, due to instruction current irefSize has changed Δ iref, the upper ring i of stagnant ringupWith under
Ring idownSize changed Δ i respectivelyref；Inverter bridge output current iLChange rate beIt is in toffIn time, iLChange
Change amount Δ iLRespectivelyIn fall time toffIt is interior, if electric current iLIt can be from ring i on stagnant ringupChange to lower ring idown,
ΔiLIt needs to change -2 × H+ Δs iref, i.e.,
To make the electric current i of inverter bridge reality outputLDecline, optional inverter bridge output state has negative level U-Or zero level two
Kind state：
When selected inverter bridge output negative electricity level state, electric current iLRate of change beElectric current when selected zero level
iLRate of change beElectric current i when selected inverter bridge output negative levelLRate of descent be more than selected inverter bridge and export zero
Current levels iLRate of descent；
Electric current i when if inverter bridge selectes output zero levelLIt can be in limitation time TlmtIt is interior to reach lower ring, then it selectes
Inverter bridge output zero level is to ensure that the lowermost switch frequency of converter bridge switching parts pipe, and then ensures the tracking essence of inverter
Degree；If in limitation time TlmtInterior electric current iLLower ring is can not reach, then selectes inverter bridge and exports negative electricity level state；Work asWhen, it selectes inverter bridge and exports zero level state, otherwise select inverter bridge and export negative electricity
Level state.
The hysteresis control method thereof of three-level inverter proposed by the present invention realizes the reliable current to three-level inverter
Hysteresis loop tracking controls, and limits the lowermost switch frequency of three-level inverter Hysteresis control, ensure that three-level inverter electric current
Tracking effect improves inverter performance；It is attached in output voltage zero crossing to solve traditional Hysteresis control three-level inverter
Nearly switching frequency is too low, the problem of causing output current to distort.
Description of the drawings
Fig. 1 is the fundamental diagram of Hysteresis control；
Fig. 2 is three-phase tri-level inverter structure schematic diagram provided in an embodiment of the present invention；
Fig. 3 is the hysteresis control method thereof schematic diagram of three-level inverter provided in an embodiment of the present invention；
Fig. 4 is the curent change schematic diagram of Hysteresis control provided in an embodiment of the present invention.
Fig. 5-1 and Fig. 5-2 is the control of the hysteresis control method thereof of three-level inverter provided in an embodiment of the present invention
Effect waveform processed；
Fig. 6 is single-phase H bridges three-level inverter structural schematic diagram provided in an embodiment of the present invention.
Specific implementation mode
The invention will be further described with reference to the accompanying drawings and examples.It is understood that tool described herein
Body embodiment is used only for explaining the present invention rather than limitation of the invention.It also should be noted that for the ease of retouching
It states, only some but not all contents related to the present invention are shown in the drawings.
It please refers to shown in Fig. 3, Fig. 3 is the hysteresis control method thereof principle of three-level inverter provided in an embodiment of the present invention
Figure.The hysteresis control method thereof of three-level inverter specifically includes in the present embodiment：
The output of three-level inverters has positive level U+, negative level U-With three kinds of states of zero level.When inverter bridge exports positive electricity
After flat, inverter bridge output current iLIn propradation.After inverter bridge exports negative level, inverter bridge output current iLIt is in down
Drop state.After inverter bridge exports zero level, inverter bridge output current iLChange direction, which may rise, to be declined, practical to become
It is related to the polarity of network voltage to change direction.
S101, the electric current i when inverter bridge reality outputLWith instruction current irefDifference DELTA i be less than negative sense ring width (- H),
Calculate inverter bridge actual output current iLChange rate, instruction current irefChange rate, setting limitation time Tlmt, sentence by comparing
It is disconnected, select three-level inverters to need to export positive level U+Or zero level state, make the electric current i of inverter bridge reality outputLRise.
If as shown in figure 4, in t0Position, the electric current i of inverter bridge reality outputLWith instruction current irefDifference DELTA i be less than
Negative sense ring width (- H) then changes the output state of inverter bridge, makes the electric current i of inverter bridge reality outputLRise；To ensure inverter bridge
The lowermost switch frequency of switching tube, need to limit electric current iLRise time ton, tonLimitation time T cannot be more thanlmt；
Instruction current irefChange rate beIn rise time tonIn time, irefVariation delta irefForIn rise time tonIt is interior, due to instruction current irefSize has changed Δ iref, the upper ring i of stagnant ringupWith lower ring
idownSize changed Δ i respectivelyref；Inverter bridge actual output current iLChange rate beIt is in tonIn time, iL's
Variation delta iLRespectivelyIn rise time tonIt is interior, if electric current iLIt can be from ring i under stagnant ringdownChange to ring iup,
ΔiLNeed variation 2 × H+ Δs iref, i.e.,
To make the electric current i of inverter bridge reality outputLRise, optional inverter bridge output state has positive level U+Or zero level two
Kind state：
When selected inverter bridge output positive electricity level state, electric current iLRate of change beWherein uoIt is inverse for three level
Become device output voltage, L is series inductance after three-level inverters；When selected inverter bridge output zero level state, electric current iLChange
Changing rate isElectric current i when selected inverter bridge output positive levelLClimbing when being more than selected inverter bridge and exporting zero level
Electric current iLClimbing；
Electric current i when if inverter bridge selectes output zero levelLIt can be in limitation time TlmtIt is interior to reach ring, then it selectes
Inverter bridge output zero level state is to ensure that the lowermost switch frequency of converter bridge switching parts pipe, and then ensures the tracking of inverter
Otherwise precision selectes inverter bridge and exports positive electricity level state, that is, works asWhen, select inverter bridge
Zero level state is exported, inverter bridge is otherwise selected and exports positive electricity level state.
S102, the electric current i when inverter bridge reality outputLWith instruction current irefDifference DELTA i be more than forward direction ring width (H) when,
Calculate inverter bridge actual output current iLChange rate, instruction current irefChange rate, setting limitation time Tlmt, sentence by comparing
It is disconnected, select three-level inverters to need to export negative level U-Or zero level state, make the electric current i of inverter bridge reality outputLDecline.
If as shown in figure 4, in t1Position, the electric current i of inverter bridge reality outputLWith instruction current irefDifference DELTA i be more than
Positive ring width (H), then change the output state of inverter bridge, makes the electric current i of inverter bridge reality outputLDecline；To ensure inverter
Tracking accuracy, electric current i need to be limitedLFall time toff, toffLimitation time T cannot be more thanlmt；
Instruction current irefChange rate beIn fall time toffIn time, irefVariation delta irefForIn fall time toffIt is interior, due to instruction current irefSize has changed Δ iref, the upper ring i of stagnant ringupWith under
Ring idownSize changed Δ i respectivelyref；Inverter bridge output current iLChange rate beIt is in toffIn time, iLChange
Change amount Δ iLRespectivelyIn fall time toffIt is interior, if electric current iLIt can be from ring i on stagnant ringupChange to lower ring idown,
ΔiLIt needs to change -2 × H+ Δs iref, i.e.,
To make the electric current i of inverter bridge reality outputLDecline, optional inverter bridge output state has negative level U-Or zero level two
Kind state：
When selected inverter bridge output negative electricity level state, electric current iLRate of change beElectric current when selected zero level
iLRate of change beElectric current i when selected inverter bridge output negative levelLRate of descent be more than selected inverter bridge and export zero
Current levels iLRate of descent；
Electric current i when if inverter bridge selectes output zero levelLIt can be in limitation time TlmtIt is interior to reach lower ring, then it selectes
Inverter bridge output zero level is to ensure that the lowermost switch frequency of converter bridge switching parts pipe, and then ensures the tracking essence of inverter
Degree；If in limitation time TlmtInterior electric current iLLower ring is can not reach, then selectes inverter bridge and exports negative electricity level state；Work asWhen, it selectes inverter bridge and exports zero level state, otherwise select inverter bridge and export negative electricity
Level state.
The control effect waveform of the hysteresis control method thereof of three-level inverter is as shown in Fig. 5-1 and 5-2 in the present embodiment.
Detailed process of the present invention is described in detail by taking three-phase tri-level inverter as an example below：As shown in Fig. 2, a kind of
Three-level current hystersis controller includes three-level inverters, output filter, current sensor, voltage sensor, driving control
Unit processed etc., wherein stagnant ring comparing unit is located in drive control unit.Can by change inverter bridge in switching tube driving,
Inverter bridge is set to export U+、U-With 0 three kinds of level, and then control inverter bridge outputting inductance on electric current iLSize and Orientation, with ensure
iLAlways within stagnant ring ring width.It is as follows in the hysteresis control method thereof detailed process of the present embodiment, three-level inverter：
1) when i occurs in any one phaseL-iref<- H needs the output state for changing inverter bridge, makes i at this timeLRise.Optionally
Inverter bridge output level has U+Or 0 two kinds.After selected zero level, the change rate of inductive currentThe change of instruction current
RateIt can be by instructing variation to calculate.
Select the stagnant suitable ring width H of ring.The corresponding time T of lowermost switch frequency of selected limitationlmt。
WhenWhen, Q2 and Q3 pipes are opened, Q1 and Q4 pipes is turned off, inverter bridge is made to export
Zero level.
WhenWhen, Q1 and Q2 pipes are opened, Q3 and Q4 pipes is turned off, inverter bridge is made to export
U+Level.
2) when i occurs in any one phaseL-iref>H needs the output state for changing inverter bridge, makes i at this timeLDecline.Optionally
Inverter bridge output level has U-Or 0 two kinds.
After selected zero level, the change rate of inductive currentThe change rate of instruction currentInstruction can be passed through
Variation calculates.
Select the stagnant suitable ring width H of ring.The corresponding time T of lowermost switch frequency of selected limitationlmt。
WhenWhen, Q2 and Q3 pipes are opened, Q1 and Q4 pipes is turned off, inverter bridge is made to export
Zero level.
WhenWhen, Q4 and Q3 pipes are opened, Q1 and Q2 pipes is turned off, keeps inverter bridge defeated
Go out U-Level.
The three-phase output state of three-level inverter can calculate separately through the invention to be obtained.Three-phase inversion in the present embodiment
The those of ordinary skill in the art such as bridge, output filter, current sensor, voltage sensor, drive control unit pass through existing
Known technology can be realized.The present disclosure applies equally to the three-phase three-line systems that bus capacitor midpoint does not connect.
It should be noted that single-phase inverter is equally applicable to the present invention, it is only necessary to calculate a phase inverter bridge reality output
Current changing rate, instruction current change rate limit lowermost switch frequency, and by comparing judgement, calculate tri-level inversion
Bridge needs the level state exported, realizes that hysteretic loop current control, detailed process are same as above, details are not described herein.As shown in fig. 6, being
Single-phase H bridge inverters use known H bridge three-level inverters, output filter, current sensor, electricity in this inverter
The those of ordinary skill in the art such as pressure sensor, drive control unit can be realized by existing known technology.
Technical scheme of the present invention realizes the reliable current hysteresis loop tracking control to three-level inverter, limits three electricity
The lowermost switch frequency of flat inverter Hysteresis control ensure that three-level inverter current tracking effect, improve inverter
Energy；It is too low in output voltage near zero-crossing point switching frequency to solve traditional Hysteresis control three-level inverter, causes to export
The problem of current distortion.
The technical principle of the present invention is described above in association with specific embodiment.These descriptions are intended merely to explain the present invention's
Principle, and it cannot be construed to limiting the scope of the invention in any way.Based on the explanation herein, the technology of this field
Personnel would not require any inventive effort the other specific implementation modes that can associate the present invention, these modes are fallen within
Within protection scope of the present invention.
Claims (2)
1. a kind of hysteresis control method thereof of three-level inverter, which is characterized in that specifically include：
S101, the electric current i when inverter bridge reality outputLWith instruction current irefDifference DELTA i be less than negative sense ring width (- H) when, calculate
Inverter bridge actual output current iLChange rate, instruction current irefChange rate, setting limitation time Tlmt, by comparing judgement, choosing
Three-level inverters are selected to need to export positive level U+Or zero level state, make the electric current i of inverter bridge reality outputLRise；Specific packet
It includes：If in t0Position, the electric current i of inverter bridge reality outputLWith instruction current irefDifference DELTA i be less than negative sense ring width (- H), then
The output state for changing inverter bridge, makes the electric current i of inverter bridge reality outputLRise；To ensure the tracking accuracy of inverter, need to limit
Electric current i processedLRise time ton, tonLimitation time T cannot be more thanlmt；
Instruction current irefChange rate beIn rise time tonIn time, irefVariation delta irefFor?
Rise time tonIt is interior, due to instruction current irefSize has changed Δ iref, the upper ring i of stagnant ringupWith lower ring idownSize
Δ i is changed respectivelyref；Inverter bridge actual output current iLChange rate beIt is in tonIn time, iLVariation delta iL
RespectivelyIn rise time tonIt is interior, if electric current iLIt can be from ring i under stagnant ringdownChange to ring iup, Δ iLIt needs to become
Change 2 × H+ Δs iref, i.e.,
To make the electric current i of inverter bridge reality outputLRise, optional inverter bridge output state has positive level U+Or two kinds of shapes of zero level
State：
When selected inverter bridge output positive electricity level state, electric current iLRate of change beWherein uoIt is defeated for three-level inverter
Go out voltage, L is series inductance after three-level inverters；When selected inverter bridge output zero level state, electric current iLRate of change
ForElectric current i when selected inverter bridge output positive levelLClimbing be more than electric current i when selected inverter bridge exports zero levelL
Climbing；
Electric current i when if inverter bridge selectes output zero levelLIt can be in limitation time TlmtIt is interior to reach ring, then select inverter bridge
Output zero level state is to ensure that the lowermost switch frequency of converter bridge switching parts pipe, and then ensures the tracking accuracy of inverter,
Otherwise it selectes inverter bridge and exports positive electricity level state, that is, work asWhen, select inverter bridge output zero
Otherwise level state selectes inverter bridge and exports positive electricity level state；
S102, the electric current i when inverter bridge reality outputLWith instruction current irefDifference DELTA i be more than forward direction ring width (H) when, calculating
Inverter bridge actual output current iLChange rate, instruction current irefChange rate, setting limitation time Tlmt, by comparing judgement, choosing
Three-level inverters are selected to need to export negative level U-Or zero level state, make the electric current i of inverter bridge reality outputLDecline.
2. the hysteresis control method thereof of three-level inverter according to claim 1, which is characterized in that the step S102 tools
Body includes：If in t1Position, the electric current i of inverter bridge reality outputLWith instruction current irefDifference DELTA i be more than positive ring width (H),
The output state for then changing inverter bridge makes the electric current i of inverter bridge reality outputLDecline；To ensure the tracking accuracy of inverter, need
Limit electric current iLFall time toff, toffLimitation time T cannot be more thanlmt；
Instruction current irefChange rate beIn fall time toffIn time, irefVariation delta irefFor
In fall time toffIt is interior, due to instruction current irefSize has changed Δ iref, the upper ring i of stagnant ringupWith lower ring idownIt is big
It is small to have changed Δ i respectivelyref；Inverter bridge output current iLChange rate beIt is in toffIn time, iLVariation delta iLPoint
It is notIn fall time toffIt is interior, if electric current iLIt can be from ring i on stagnant ringupChange to lower ring idown, Δ iLIt needs to become
Change -2 × H+ Δs iref, i.e.,
To make the electric current i of inverter bridge reality outputLDecline, optional inverter bridge output state has negative level U-Or two kinds of shapes of zero level
State：
When selected inverter bridge output negative electricity level state, electric current iLRate of change beElectric current i when selected zero levelLChange
Changing rate isElectric current i when selected inverter bridge output negative levelLRate of descent be more than selected inverter bridge and export zero level electricity
Flow iLRate of descent；
Electric current i when if inverter bridge selectes output zero levelLIt can be in limitation time TlmtIt is interior to reach lower ring, then select inverter bridge
Output zero level is to ensure that the lowermost switch frequency of converter bridge switching parts pipe, and then ensures the tracking accuracy of inverter；If
Limit time TlmtInterior electric current iLLower ring is can not reach, then selectes inverter bridge and exports negative electricity level state；Work asWhen, it selectes inverter bridge and exports zero level state, otherwise select inverter bridge and export negative electricity
Level state.
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| CN106253727B (en) * | 2016-08-23 | 2019-01-29 | 重庆大学 | More level hysteresis control method thereofs based on error change amount |
| CN110932586B (en) * | 2019-12-12 | 2021-03-12 | 北京自动化控制设备研究所 | Method and device for reducing switching frequency of current hysteresis loop control full-bridge inverter |
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| CN113472232A (en) * | 2021-07-12 | 2021-10-01 | 北京国科翼达电力节能科技有限公司 | Five-level hysteresis comparison inverter |
| CN113725854B (en) * | 2021-09-01 | 2023-08-08 | 青岛鼎信通讯股份有限公司 | Seamless switching control method applied to flexible direct-current comprehensive voltage regulating device |
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