CN109039043A - Inhibit the zero-sequence component optimization method of three-level current transformer bus Neutral-point Potential Fluctuation - Google Patents
Inhibit the zero-sequence component optimization method of three-level current transformer bus Neutral-point Potential Fluctuation Download PDFInfo
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- CN109039043A CN109039043A CN201810948773.0A CN201810948773A CN109039043A CN 109039043 A CN109039043 A CN 109039043A CN 201810948773 A CN201810948773 A CN 201810948773A CN 109039043 A CN109039043 A CN 109039043A
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
Abstract
The present invention discloses a kind of zero-sequence component optimization method for inhibiting three-level current transformer bus Neutral-point Potential Fluctuation, sets zero-sequence component initial value, changes zero-sequence component with fixed step size, gradually finding makes the smallest optimal zero-sequence component of midpoint electric current.The present invention can obtain optimal zero-sequence component under any power factor and any modulation degree, the optimal zero-sequence component of acquisition is given sinusoidal voltage modulated signal with three-phase to be superimposed, obtain final three-phase voltage modulated signal, respectively with the high frequency triangular carrier of positive polarity, negative polarity high frequency triangular carrier compared with size obtain three-level current transformer device for power switching driving signal, DC bus Neutral-point Potential Fluctuation can be suppressed to minimum, inhibit DC bus Neutral-point Potential Fluctuation to provide reference for research zero-sequence component injection method.The present invention does not need additional voltage sensor detection mid-point potential offset, reduces inverter hardware cost.
Description
Technical field
The invention belongs to power electronics fields, are related to three-level current transformer modulation technique, specifically, are related to one kind
Inhibit the zero-sequence component optimization method of three-level current transformer bus Neutral-point Potential Fluctuation.
Background technique
The output current harmonics of three-level current transformer are small, sine degree is high, and switching device voltage stress is low, electromagnetic radiation
It interferes small.Therefore, three-level current transformer has obtained widely in fields such as generation of electricity by new energy, active power filtering, motor drivens
Using.But the DC bus Neutral-point Potential Fluctuation problem of three current converters will increase output current harmonics, reduce three electricity
The performance of flat current transformer.
The fluctuation of DC bus midpoint potential is influenced by modulator approach, power-factor angle and modulation degree.Can by
The mode for increasing DC capacitor on hardware reduces DC bus Neutral-point Potential Fluctuation, but will increase current transformer hardware cost.Cause
This, existing method improves modulator approach in software usually to inhibit the fluctuation of DC bus midpoint potential.Improve modulation
There are mainly two types of methods: one is zero-sequence component injection methods, i.e., the zero-sequence component of specific shape are injected three-phase modulations wave；It is a kind of
It is the method based on space voltage vector modulation, i.e., by redistributing the action time of redundancy small vector, this method is demonstrate,proved
It is bright equivalent with zero-sequence component injection method.Both methods can play a role to DC bus Neutral-point Potential Fluctuation, but
Can not determine whether method therefor is best practice, if DC bus Neutral-point Potential Fluctuation is suppressed to minimum.Therefore, it is necessary to
A kind of zero-sequence component optimization method can be directed to the specific working condition of three-level current transformer (i.e. different capacity factor, the non-people having the same aspiration and interest
System), farthest inhibit DC bus Neutral-point Potential Fluctuation.
Summary of the invention
The purpose of the present invention is being directed to above-mentioned technical problem of the existing technology, a kind of inhibition three-level current transformer is provided
DC bus Neutral-point Potential Fluctuation can be suppressed to most by the zero-sequence component optimization method of bus Neutral-point Potential Fluctuation, this method
It is small.
The technical scheme is that a kind of zero-sequence component optimizing for inhibiting three-level current transformer bus Neutral-point Potential Fluctuation
Method, comprising the following steps:
Three-phase is set and gives sinusoidal voltage modulated signal, and measures the three-phase output electric current of three-level current transformer；Setting is sought
Excellent zero-sequence component step-length and DC bus midpoint electric current least absolute value；
Compare the size that three-phase gives sinusoidal voltage modulated signal, show that three-phase gives the maximum of sinusoidal voltage modulated signal
Value and minimum value；It enables zero-sequence component be equal to -1 and subtracts the minimum value that three-phase gives sinusoidal voltage modulated signal；
Three-phase is given into sinusoidal voltage modulated signal and is superimposed acquisition three-phase voltage modulated signal with zero-sequence component；According to three-phase
The relationship of voltage modulation signal, three-phase output electric current and DC bus midpoint electric current, is calculated DC bus midpoint electric current；
The absolute value and DC bus midpoint electric current least absolute value for comparing DC bus midpoint electric current, if in DC bus
Point electric current least absolute value is greater than the absolute value of DC bus midpoint electric current, then enables DC bus midpoint electric current least absolute value etc.
In the absolute value of current DC bus midpoint electric current, and optimal zero-sequence component is enabled to be equal to current zero-sequence component；Otherwise, keep former
Some DC bus midpoint electric current least absolute values and optimal zero-sequence component are constant；
Current zero-sequence component superposition optimizing zero-sequence component step-length obtains new zero-sequence component, whether judges new zero-sequence component
Subtract the maximum value that three-phase gives sinusoidal voltage modulated signal less than 1；If new zero-sequence component, which subtracts three-phase less than 1, gives sinusoidal voltage
The maximum value of modulated signal then returns and three-phase is given sinusoidal voltage modulated signal to be again superimposed with new zero-sequence component acquisition new
Three-phase voltage modulated signal；If new zero-sequence component, which is greater than or equal to 1, subtracts the maximum that three-phase gives sinusoidal voltage modulated signal
Value, then current zero-sequence component is optimal zero-sequence component.
Preferably, the optimal zero-sequence component of acquisition is given sinusoidal voltage modulated signal with three-phase to be superimposed, is obtained final
Three-phase voltage modulated signal, by the high frequency triangular carrier of three-phase voltage modulated signal and positive polarity, the high frequency triangle of negative polarity
Carrier wave is bigger small, obtains the driving signal of three-level current transformer device for power switching.
Preferably, the calculation formula of three-phase voltage adjustment signal are as follows:
In formula, ma'、mb'、mc' it is three-phase voltage adjustment signal, ma、mb、mcSinusoidal voltage modulated signal is given for three-phase,
m0For zero-sequence component.
Preferably, the calculation formula of DC bus midpoint electric current are as follows:
inp=(1- | ma'|)ia+(1-|mb'|)ib+(1-|mc'|)ic (2)
In formula, inpFor DC bus midpoint electric current, ia、ib、icElectric current is exported for three-phase.
Preferably, by DC bus midpoint electric current inpTake absolute value and obtain the absolute value of DC bus midpoint electric current | inp
|, | inp| with DC bus midpoint electric current least absolute value inp_absminCompare, if DC bus midpoint electric current least absolute value
inp_absminIt is greater than | inp|, then enable DC bus midpoint electric current least absolute value inp_absmin=| inp|, optimal zero-sequence component
m0_best=m0；Otherwise, original DC bus midpoint electric current least absolute value i is keptnp_absminWith optimal zero-sequence component m0_best
It is constant.
The present invention having the beneficial effect that compared with prior art
(1) present invention can obtain optimal zero-sequence component under any power factor and any modulation degree, the zero sequence point
Amount is superimposed with modulating wave, DC bus Neutral-point Potential Fluctuation can be suppressed to minimum, solve existing method and be only capable of direct current
Bus Neutral-point Potential Fluctuation carries out a degree of inhibition, and DC bus Neutral-point Potential Fluctuation cannot be suppressed to the smallest ask
Topic.
(2) present invention, which can be obtained, is suppressed to the smallest zero-sequence component for three-level current transformer DC bus midpoint potential,
To inhibit DC bus Neutral-point Potential Fluctuation to provide reference for research zero-sequence component injection method.
(3) present invention passes through zero sequence point according to the relationship of three-level current transformer DC bus midpoint potential and midpoint electric current
It is minimum that amount optimizing makes midpoint current fluctuation, to reach the mesh for inhibiting three-level current transformer DC bus Neutral-point Potential Fluctuation
's.It therefore, there is no need to additional voltage sensor detection mid-point potential offset, reduce current transformer hardware cost.
Detailed description of the invention
Fig. 1 is T-type of embodiment of the present invention three-level current transformer topology diagram；
Fig. 2 is the zero-sequence component optimizing modulation blocks that the embodiment of the present invention inhibits three-level current transformer bus Neutral-point Potential Fluctuation
Figure；
Fig. 3 is the zero-sequence component optimization method that the embodiment of the present invention inhibits three-level current transformer bus Neutral-point Potential Fluctuation
Flow chart；
Fig. 4 be power-factor angle of the embodiment of the present invention be π/4, midpoint current waveform figure when modulation degree is 0.7；
Fig. 5 be power-factor angle of the embodiment of the present invention be π/3, midpoint current waveform figure when modulation degree is 0.8.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described.
Present invention discloses a kind of zero-sequence component optimization method for inhibiting three-level current transformer bus Neutral-point Potential Fluctuation, energy
Enough to obtain optimal zero-sequence component under any power factor and any modulation degree, which is superimposed with modulating wave, can
DC bus Neutral-point Potential Fluctuation is suppressed to minimum.
It is provided by the invention inhibit three-level current transformer bus Neutral-point Potential Fluctuation zero-sequence component optimization method include with
Lower method and step:
Three-phase is set and gives sinusoidal voltage modulated signal, and measures the three-phase output electric current of three-level current transformer；Setting is sought
Excellent zero-sequence component step-length and DC bus midpoint electric current least absolute value；
Compare the size that three-phase gives sinusoidal voltage modulated signal, show that three-phase gives the maximum of sinusoidal voltage modulated signal
Value and minimum value；It enables zero-sequence component be equal to -1 and subtracts the minimum value that three-phase gives sinusoidal voltage modulated signal；
Three-phase is given into sinusoidal voltage modulated signal and is superimposed acquisition three-phase voltage modulated signal with zero-sequence component；According to three-phase
The relationship of voltage modulation signal, three-phase output electric current and DC bus midpoint electric current, is calculated DC bus midpoint electric current；
The absolute value and DC bus midpoint electric current least absolute value for comparing DC bus midpoint electric current, if in DC bus
Point electric current least absolute value is greater than the absolute value of DC bus midpoint electric current, then enables DC bus midpoint electric current least absolute value etc.
In the absolute value of current DC bus midpoint electric current, and optimal zero-sequence component is enabled to be equal to current zero-sequence component；Otherwise, keep former
Some DC bus midpoint electric current least absolute values and optimal zero-sequence component are constant；
Current zero-sequence component superposition optimizing zero-sequence component step-length obtains new zero-sequence component, whether judges new zero-sequence component
Subtract the maximum value that three-phase gives sinusoidal voltage modulated signal less than 1；If new zero-sequence component, which subtracts three-phase less than 1, gives sinusoidal voltage
The maximum value of modulated signal then returns and three-phase is given sinusoidal voltage modulated signal to be again superimposed with new zero-sequence component acquisition new
Three-phase voltage modulated signal；If new zero-sequence component, which is greater than or equal to 1, subtracts the maximum that three-phase gives sinusoidal voltage modulated signal
Value, then current zero-sequence component is optimal zero-sequence component.
The above-mentioned optimization method of the present invention, sets zero-sequence component initial value, according to three-level current transformer DC bus midpoint electricity
The relationship of position and midpoint electric current changes zero-sequence component with fixed step size, and gradually finding makes the smallest optimal zero sequence of midpoint electric current point
Amount makes midpoint current fluctuation minimum, to inhibit three-level current transformer DC bus midpoint potential by zero-sequence component optimizing
Fluctuation.
As a preferred embodiment of above-mentioned optimization method, the optimal zero-sequence component of acquisition and three-phase are given into sinusoidal voltage tune
Signal averaging processed obtains final three-phase voltage modulated signal, and the high frequency triangle of three-phase voltage modulated signal and positive polarity is carried
Wave, negative polarity high frequency triangular carrier compare size, obtain the driving signal of three-level current transformer device for power switching.
The above-mentioned optimization method of the present invention is illustrated with a specific embodiment below.
By taking T-type three-level current transformer as an example, referring to Fig. 1, the topological structure of T-type three-level current transformer contains DC bus electricity
Hold Cdc1With dc-link capacitance Cdc2, filter inductance La, filter inductance Lb, filter inductance Lc, ohmic load Ra, ohmic load Rb、
Ohmic load RcAnd device for power switching Qa1, device for power switching Qa2, device for power switching Qa3, device for power switching Qa4、
Device for power switching Qb1, device for power switching Qb2, device for power switching Qb3, device for power switching Qb4, device for power switching Qc1、
Device for power switching Qc2, device for power switching Qc3, device for power switching Qc4；Vdc1And Vdc2Respectively dc-link capacitance Cdc1With
Dc-link capacitance Cdc2Voltage；VdcFor total DC bus-bar voltage；ia、ib、icElectric current is exported for three-phase；inpTo flow out direct current
The midpoint electric current of bus.
V in the ideal casedc1It should be equal to Vdc2, i.e., there is no fluctuations for DC bus midpoint potential.But in current transformer reality
In the operation of border, Vdc1And Vdc2And it is unequal, DC bus midpoint potential exists in various degree with current transformer operating condition difference
Fluctuation.DC bus midpoint fluctuation voltage Δ VdcIt indicates, Δ Vdc=Vdc1–Vdc2.DC bus midpoint electric current inpBy direct shadow
Ring the size of DC bus Neutral-point Potential Fluctuation.For example, inpFlow out DC bus midpoint, Vdc1It will increase, Vdc2It will reduce；inp
Flow into DC bus midpoint, Vdc1It will reduce, Vdc2It will increase.If Cdc1=Cdc2=Cdc, then DC bus midpoint fluctuation voltage Δ
VdcWith DC bus midpoint electric current inpBetween relational expression are as follows:
By formula (3) it is found that reducing inpFluctuation can effectively reduce Δ VdcFluctuation.Therefore, the above-mentioned optimizing of the present invention
Method will make midpoint electric current i by zero-sequence component optimizingnpFluctuation amplitude is minimum, inhibits the fluctuation of DC bus midpoint to reach
Voltage Δ VdcPurpose.
Referring to Fig. 3, above-mentioned optimization method is to above-mentioned T-type three-level current transformer DC bus midpoint potential wave through the invention
Specific step is as follows for dynamic zero-sequence component optimizing:
S1, setting three-phase give sinusoidal voltage modulated signal ma、mb、mc, and measure the three-phase output electricity of three-level current transformer
Flow ia、ib、ic；Set optimizing zero-sequence component step delta m0With DC bus midpoint electric current least absolute value inp_absmin。
S2, compare the given sinusoidal voltage modulated signal m of three-phasea、mb、mcSize, obtain three-phase give sinusoidal voltage modulation
Signal ma、mb、mcMaximum value mmaxWith minimum value mmin；Enable zero-sequence component m0Subtract three-phase equal to -1 and gives sinusoidal voltage modulation letter
Number minimum value mmin, it may be assumed that m0=-1-mmin, to complete zero-sequence component optimizing adjustment initialization.
S3, three-phase is given to sinusoidal voltage modulated signal ma、mb、mcWith zero-sequence component m0Superposition obtains three-phase voltage modulation
Signal ma'、mb'、mc', three-phase voltage adjustment signal ma'、mb'、mc' calculation formula are as follows:
Obtain three-phase voltage modulated signal ma'、mb'、mc' after, according to three-phase voltage modulated signal ma'、mb'、mc', three-phase
Export electric current ia、ib、icWith DC bus midpoint electric current inpRelationship, DC bus midpoint electric current is calculated；In DC bus
The calculation formula of point electric current are as follows:
inp=(1- | ma'|)ia+(1-|mb'|)ib+(1-|mc'|)ic (2)
The DC bus midpoint electric current i that will be obtainednpTake absolute value and obtain the absolute value of DC bus midpoint electric current | inp|。
S4, the absolute value for comparing DC bus midpoint electric current | inp| with DC bus midpoint electric current least absolute value
inp_absminIf DC bus midpoint electric current least absolute value inp_absminGreater than the absolute value of DC bus midpoint electric current | inp|,
That is: inp_absmin>|inp|, then enable DC bus midpoint electric current least absolute value inp_absminEqual to current DC bus midpoint electric current
Absolute value | inp|, it may be assumed that inp_absmin=| inp|, and enable optimal zero-sequence component m0_bestEqual to current zero-sequence component m0, it may be assumed that
m0_best=m0；Otherwise, original DC bus midpoint electric current least absolute value i is keptnp_absminWith optimal zero-sequence component m0_best
It is constant.
S5, current zero-sequence component are superimposed optimizing zero-sequence component step delta m0Obtain new zero-sequence component m0, judge new zero sequence
Component m0Whether maximum value m that three-phase give sinusoidal voltage modulated signal is subtracted less than 1max；If new zero-sequence component m0Subtract three less than 1
Mutually give the maximum value m of sinusoidal voltage modulated signalmax, it may be assumed that m0<1–mmax, then return and three-phase given into sinusoidal voltage tune again
Signal m processeda、mb、mcWith new zero-sequence component m0Superposition obtains new three-phase voltage modulated signal ma'、mb'、mc', i.e., it holds again
The formula (1) of row step S3；If new zero-sequence component m0Subtract the maximum that three-phase gives sinusoidal voltage modulated signal more than or equal to 1
Value mmax, it may be assumed that m0≥1–mmax, then current zero-sequence component m0As optimal zero-sequence component m0_best, searching process terminates.
Referring to fig. 2, by the optimal zero-sequence component m of acquisition0_bestSinusoidal voltage modulated signal m is given with three-phasea、mb、mcIt is folded
Add, obtains final three-phase voltage modulated signal ma'、mb'、mc', by three-phase voltage modulated signal ma'、mb'、mc' and positive polarity
High frequency triangular carrier Zup, negative polarity high frequency triangular carrier ZloCompare size, obtains 12 power of T-type three-level current transformer
The driving signal of switching device.It is illustrated by taking A phase as an example.ma' and ZupCompare, works as ma' it is greater than ZupWhen, device for power switching Qa1
Driving signal Da1For high level, Qa1It is open-minded；Otherwise, Da1For low level, Qa1Shutdown.Da1Module is negated by " NOT " to obtain
Device for power switching Qa3Driving signal Da3。ma' and ZloCompare, works as ma' it is greater than ZloWhen, device for power switching Qa2Driving letter
Number Da2For high level, Qa2It is open-minded；Otherwise, Da2For low level, Qa2Shutdown.Da4Module, which is negated, by " NOT " obtains power switch
Device Qa4Driving signal Da4.The driving signal D of B phase and C phaseb1、Db2、Db3、Db4、Dc1、Dc2、Dc3、Dc4Acquisition is similar with A,
It is not reinflated herein to repeat.
Effect in order to further illustrate the present invention, using the above-mentioned inhibition three-level current transformer bus midpoint potential of the present invention
The zero-sequence component optimization method of fluctuation obtains DC bus midpoint current waveform under different capacity factor angle and modulation degree.Root
According to formula (3) it is found that the fluctuation of DC bus midpoint electric current can represent DC bus Neutral-point Potential Fluctuation size.
Referring to fig. 4, midpoint current waveform when power-factor angle is π/4, modulation degree is 0.7.From fig. 4, it can be seen that at this time
The current fluctuation of DC bus midpoint is suppressed to minimum, and fluctuation zero illustrates having for zero-sequence component optimization method of the invention
Effect property.
Midpoint current waveform referring to Fig. 5, when power-factor angle is π/3, modulation degree is 0.8.Due to power-factor angle and
Modulation degree is larger, can not completely eliminate midpoint potential using zero-sequence component method, can only minimize fluctuation.It can by Fig. 5
See, midpoint current fluctuation maximum value at this time is 0.18A, and fluctuation is smaller, further illustrates zero-sequence component optimizing of the invention
The validity of method.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
It imitates embodiment and is applied to other fields, but without departing from the technical solutions of the present invention, according to the technical essence of the invention
Any simple modification, equivalent variations and remodeling to the above embodiments, still fall within the protection scope of technical solution of the present invention.
Claims (5)
1. a kind of zero-sequence component optimization method for inhibiting three-level current transformer bus Neutral-point Potential Fluctuation, which is characterized in that including
Following steps:
Three-phase is set and gives sinusoidal voltage modulated signal, and measures the three-phase output electric current of three-level current transformer；Set optimizing zero
Order components step-length and DC bus midpoint electric current least absolute value；
Compare three-phase give sinusoidal voltage modulated signal size, obtain three-phase give sinusoidal voltage modulated signal maximum value and
Minimum value；It enables zero-sequence component be equal to -1 and subtracts the minimum value that three-phase gives sinusoidal voltage modulated signal；
Three-phase is given into sinusoidal voltage modulated signal and is superimposed acquisition three-phase voltage modulated signal with zero-sequence component；According to three-phase voltage
The relationship of modulated signal, three-phase output electric current and DC bus midpoint electric current, is calculated DC bus midpoint electric current；
The absolute value and DC bus midpoint electric current least absolute value for comparing DC bus midpoint electric current, if DC bus midpoint is electric
The absolute value that least absolute value is greater than DC bus midpoint electric current is flowed, then enables DC bus midpoint electric current least absolute value be equal to and works as
The absolute value of preceding DC bus midpoint electric current, and optimal zero-sequence component is enabled to be equal to current zero-sequence component；Otherwise, keep original
DC bus midpoint electric current least absolute value and optimal zero-sequence component are constant；
Current zero-sequence component superposition optimizing zero-sequence component step-length obtains new zero-sequence component, judges whether new zero-sequence component is less than
1 subtracts the maximum value that three-phase gives sinusoidal voltage modulated signal；If new zero-sequence component, which subtracts three-phase less than 1, gives sinusoidal voltage modulation
The maximum value of signal, then return three-phase is given sinusoidal voltage modulated signal to be again superimposed with new zero-sequence component and obtain new three
Phase voltage modulated signal；If new zero-sequence component, which is greater than or equal to 1, subtracts the maximum value that three-phase gives sinusoidal voltage modulated signal,
Current zero-sequence component is optimal zero-sequence component.
2. the zero-sequence component optimization method according to claim 1 for inhibiting three-level current transformer bus Neutral-point Potential Fluctuation,
It is superimposed it is characterized in that, the optimal zero-sequence component of acquisition is given sinusoidal voltage modulated signal with three-phase, obtains final three-phase
Voltage modulation signal, by the high frequency triangular carrier of three-phase voltage modulated signal and positive polarity, the high frequency triangular carrier ratio of negative polarity
Compared with size, the driving signal of three-level current transformer device for power switching is obtained.
3. the zero-sequence component optimizing side according to claim 1 or 2 for inhibiting three-level current transformer bus Neutral-point Potential Fluctuation
Method, which is characterized in that the calculation formula of three-phase voltage adjustment signal are as follows:
In formula, ma'、mb'、mc' it is three-phase voltage adjustment signal, ma、mb、mcSinusoidal voltage modulated signal, m are given for three-phase0It is zero
Order components.
4. the zero-sequence component optimization method according to claim 3 for inhibiting three-level current transformer bus Neutral-point Potential Fluctuation,
It is characterized in that, the calculation formula of DC bus midpoint electric current are as follows:
inp=(1- | ma'|)ia+(1-|mb'|)ib+(1-|mc'|)ic (2)
In formula, inpFor DC bus midpoint electric current, ia、ib、icElectric current is exported for three-phase.
5. the zero-sequence component optimization method according to claim 4 for inhibiting three-level current transformer bus Neutral-point Potential Fluctuation,
It is characterized in that, by DC bus midpoint electric current inpTake absolute value and obtain the absolute value of DC bus midpoint electric current | inp|, | inp|
With DC bus midpoint electric current least absolute value inp_absminCompare, if DC bus midpoint electric current least absolute value inp_absminGreatly
In | inp|, then enable DC bus midpoint electric current least absolute value inp_absmin=| inp|, optimal zero-sequence component m0_best=m0；It is no
Then, original DC bus midpoint electric current least absolute value i is keptnp_absminWith optimal zero-sequence component m0_bestIt is constant.
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| CN114583989A (en) * | 2021-03-22 | 2022-06-03 | 正泰集团研发中心(上海)有限公司 | Three-level inverter modulation mode switching method, device, equipment and storage medium |
| CN114583989B (en) * | 2021-03-22 | 2023-09-22 | 上海正泰电源系统有限公司 | Three-level inverter modulation mode switching method, device, equipment and storage medium |
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