CN107154725B - The selective harmonic elimination pulsewidth modulation control method and its device of deadband eliminating effect - Google Patents
The selective harmonic elimination pulsewidth modulation control method and its device of deadband eliminating effect Download PDFInfo
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- CN107154725B CN107154725B CN201710413446.0A CN201710413446A CN107154725B CN 107154725 B CN107154725 B CN 107154725B CN 201710413446 A CN201710413446 A CN 201710413446A CN 107154725 B CN107154725 B CN 107154725B
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- 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
- H02M1/36—Means for starting or stopping converters
-
- 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
- H02M7/487—Neutral point clamped inverters
-
- 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
- H02M1/38—Means for preventing simultaneous conduction of switches
- H02M1/385—Means for preventing simultaneous conduction of switches with means for correcting output voltage deviations introduced by the dead time
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- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of selective harmonic elimination pulsewidth modulation control method of deadband eliminating effect and its devices, for diode clamp bit-type NPC Multilevel Inverters, including carrying out Current Voltage closed-loop control to NPC Multilevel Inverters, voltage modulated ratio and real-time phase are calculated in real time；According to voltage modulated than inquiry preset switches angle storage table, voltage modulated is obtained than corresponding one group of standard switch angle；Standard switch angle is modified according to the output current direction of NPC Multilevel Inverters, the radian value of Delayed conducting and the radian value turned off in advance, the dead time effect in standard switch angle is eliminated, obtains one group of amendment standard switch angle；On the basis of correcting standard switch angle, angular interval locating for real-time phase is determined, obtain the corresponding driving pulse with dead zone of real-time angular, driving NPC Multilevel Inverters according to angular interval and default mapping table.The present invention can influence of the deadband eliminating effect to the driving pulse of current transformer, optimize the harmonics level of current transformer.
Description
Technical field
The present invention relates to current transformer control technology fields, eliminate more particularly to a kind of particular harmonic of deadband eliminating effect
Pulse width modulation control method and its device.
Background technique
Diode clamp bit-type (NPC, Neutral point clamped) three-level current transformer is very suitable for the middle big function of pressure
Rate industry unsteady flow is driven (such as locomotive traction, offshore wind farm, metallurgy rolling mill, mine hoist, marine propeller) field, in conjunction with
The high voltage of current transformer, strong fluidity excessively can be achieved in existing commercial high voltage large power semiconductor device (such as IGBT, IGCT, IEGT etc.)
Energy.The three-phase topology of NPC three-level current transformer is as shown in Figure 1, wherein S1、S2、S3、S4For full-controlled switch device, each is opened
Close device all one freewheeling diode (D of inverse parallel1~D4), D5、D6For clamp diode, DC bus capacitor C1=C2, capacitor electricity
Pressure value is Udc/ 2, output current of converter io。
Selective harmonic elimination pulsewidth modulation (SHEPWM, Selective Harmonic Elimination Pulse
Width Modulation), also referred to as switching-node preset PWM modulation, the realization principle of SHEPWM are to carry out Fourier to phase voltage
Leaf decomposes, and pressure fundamental voltage amplitude is particular value, and selectively makes to select by preset on staircase waveform " groove " appropriate
Several low frequency subharmonic be zero, the determination of " groove " position need to establish non-linear side as objective function to eliminate specific subharmonic
Journey group solves the information of each switching angle by numerical value calculating.Common practice is incited somebody to action after solving Nonlinear System of Equations in advance at present
Gained " groove " position switchs angle information and is stored in memory, (is i.e. deposited at preset switches angle when normal operation by tabling look-up
Store up table) read corresponding switch angle information.
Since practical application switching device is not ideal component, there is certain service time and turn-off time, all to keep away
Exempting from bridge arm direct pass leads to DC bus capacitor short circuit and device failure, it is necessary to be arranged in the complementary pulse trigger signal of same bridge arm
Greater than the dead time that device turns on and off delay, it is denoted as τd.During SHEPWM, the pulse of each power device is determined
It is needed when signal using ideal standard pulse and ideal standard switching angle as benchmark, Lai Jinhang low and high level switches.And when dead zone
Between the standard switch angle that will affect, and then make the voltage deviation of output, cause output voltage to distort, increase output voltage electricity
The harmonic content of stream causes the impact to load or power supply network, such as makes the torque of motor that big ups and downs occur and even damages, exports
The total percent harmonic distortion of electric current (Total Harmonic Distortion, THD) is unsatisfactory for International or National Grid-connection standards etc.,
Wide dead zone influences more very.
Therefore, the particular harmonic for how providing a kind of deadband eliminating effect for capableing of deadband eliminating effects eliminates pulsewidth
Modulation control method and its device are the current problems to be solved of those skilled in the art.
Summary of the invention
The object of the present invention is to provide a kind of selective harmonic elimination pulsewidth modulation control method of deadband eliminating effect and its
Device, can influence of the deadband eliminating effect to the driving pulse of current transformer, optimize the harmonics level of current transformer.
In order to solve the above technical problems, the present invention provides a kind of selective harmonic elimination pulsewidth modulations of deadband eliminating effect
Control method is used for diode clamp bit-type NPC Multilevel Inverters, comprising:
To the NPC Multilevel Inverters carry out Current Voltage closed-loop control, in real time calculate voltage modulated ratio and in real time
Phase；
According to the voltage modulated than inquiry preset switches angle storage table, the voltage modulated is obtained than corresponding one group of mark
Quasi- switching angle；
According to the output current direction of the NPC Multilevel Inverters, the radian value of Delayed conducting and the arc that turns off in advance
Angle value is modified the standard switch angle, eliminates the dead time effect in the standard switch angle, obtains one group of amendment standard
Switching angle；
On the basis of the amendment standard switch angle, angular interval locating for the real-time phase is determined, according to the angle
Degree section and default mapping table obtain the corresponding driving pulse with dead zone of the real-time angular, drive the NPC more
Level current transformer.
Preferably, the acquisition process of the radian value of the Delayed conducting and the radian value turned off in advance are as follows:
Determine the time τ of Delayed conductingd1The time τ turned off in advanced2；
Time and the time turned off in advance according to radian relational expression and the Delayed conducting obtain described prolong
When the radian value T that is connectedd1The radian value T turned off in advanced2, the radian relational expression are as follows:
Wherein, τ0For the NPC Multilevel Inverters output phase voltage fundamental period.
Preferably, the acquisition process of the default mapping table specifically:
Ideal standard switching angle and ideal standard pulse are determined according to ideal standard monophasic waveform；
The driving pulse of each power device is compared with the ideal standard pulse, is opened according to the ideal standard
Angle, the radian value of the Delayed conducting and the radian value that turns off in advance are closed, determines the angle of one group of driving pulse at each state
Spend range intervals；
The corresponding relationship between each angular range section and the state of driving pulse is recorded, obtains described default pair
Answer relation table.
Preferably, the output current direction i according to the NPC Multilevel Inverterso, Delayed conducting radian value Td1
The radian value T turned off in advanced2To the standard switch angle α0(h) it is modified, eliminates the dead zone in the standard switch angle
Effect obtains the process of one group of amendment standard switch angle α (h) specifically:
For being in each periodStandard switch angle α in range0(h), enable h in the range of [1, N]
Traversal, if h is odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)-Td1；If h is odd number io< 0 or h is even number
And io> 0, then enable α (h)=α0(h)+Td2；N is the total number at one group of standard switch angle；
For being in each periodStandard switch angle α in range0(h), enable h in the range of [1, N]
Traversal, if h is odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)-Td2；If h is odd number io< 0 or h is even number
And io> 0, then enable α (h)=α0(h)+Td1；
For being in each periodStandard switch angle α in range0(h), enable h in the range of [1, N]
Traversal, if h is odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)+Td2；If h is odd number io< 0 or h is even number
And io> 0, then enable α (h)=α0(h)-Td1；
For being in each periodStandard switch angle α in range0(h), enable h in the range of [1, N]
Interior traversal, if h is odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)+Td1；If h is odd number io< 0 or h is even
Number and io> 0, then enable α (h)=α0(h)-Td2。
Preferably, the acquisition process of preset switches angle storage table specifically:
For solving Nonlinear System of Equations by Solving Nonlinear Systems of Equations function fsolve (), to determine different voltages tune
System is than corresponding switch angle vector；The Nonlinear System of Equations are as follows:
Wherein, UdcFor the NPC Multilevel Inverters DC voltage；M is voltage modulated ratio, and M is the harmonic wave eliminated
Number.
In order to solve the above technical problems, the present invention also provides a kind of particular harmonics of deadband eliminating effect to eliminate pulsewidth tune
Control device processed is used for diode clamp bit-type NPC Multilevel Inverters, comprising:
Initial parameter obtains module, for carrying out Current Voltage closed-loop control to the NPC Multilevel Inverters, counts in real time
Calculate voltage modulated ratio and real-time phase；
Switching angle enquiry module, for, than inquiry preset switches angle storage table, obtaining the electricity according to the voltage modulated
Press the corresponding one group of standard switch angle of modulation ratio；
Dead time effect cancellation module, for output current direction, the Delayed conducting according to the NPC Multilevel Inverters
Radian value and the radian value turned off in advance are modified the standard switch angle, eliminate the dead zone effect in the standard switch angle
It answers, obtains one group of amendment standard switch angle；
Pulse generation module, for determining angle locating for the real-time phase on the basis of the amendment standard switch angle
Section is spent, obtains the corresponding driving arteries and veins with dead zone of the real-time angular according to the angular interval and default mapping table
Punching, drives the NPC Multilevel Inverters；
Switching angle storage table generation module, for obtaining preset switches angle storage table；
Radian value obtains module, for predefining the radian value and the radian turned off in advance of the Delayed conducting
Value；
Section relationship determination module, for the default mapping table to be obtained ahead of time.
Preferably, the radian value obtains module and specifically includes:
Postpone determination unit, for determining the time τ of Delayed conductingd1The time τ turned off in advanced2；
Radian value converting unit described is closed for the time according to radian relational expression and the Delayed conducting and in advance
The disconnected time obtains the radian value T of the Delayed conductingd1The radian value T turned off in advanced2, the radian relational expression are as follows:
Wherein, τ0For the NPC Multilevel Inverters output phase voltage fundamental period.
Preferably, the section relationship determination module specifically includes:
Angular range interval division unit, for determining ideal standard switching angle and reason according to ideal standard monophasic waveform
Think calibration pulse；The driving pulse of each power device is compared with the ideal standard pulse, according to the ideal mark
Quasi- switching angle, the radian value of the Delayed conducting and the radian value that turns off in advance, determine one group of driving pulse at each state
Angular range section；
Corresponding relationship recording unit, for recording pair between each angular range section and the state of driving pulse
It should be related to, obtain the default mapping table.
Preferably, the dead time effect cancellation module specifically includes:
First interval eliminates unit, for for being in each periodStandard switch angle α in range0
(h), h is enabled to traverse in the range of [1, N], if h is odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)-Td1；
If h is odd number io< 0 or h is even number and io> 0, then enable α (h)=α0(h)+Td2；N is the total number at one group of standard switch angle；
Second interval eliminates unit, for for being in each periodStandard switch angle α in range0
(h), h is enabled to traverse in the range of [1, N], if h is odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)-Td2；
If h is odd number io< 0 or h is even number and io> 0, then enable α (h)=α0(h)+Td1；
3rd interval eliminates unit, for for being in each periodStandard switch angle α in range0
(h), h is enabled to traverse in the range of [1, N], if h is odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)+Td2；
If h is odd number io< 0 or h is even number and io> 0, then enable α (h)=α0(h)-Td1；
Unit is eliminated in 4th section, for for being in each periodStandard switch angle α in range0
(h), h is enabled to traverse in the range of [1, N], if h is odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)+Td1；
If h is odd number io< 0 or h is even number and io> 0, then enable α (h)=α0(h)-Td2。
Preferably, the switching angle storage table generation module specifically includes:
Pattern determining unit is come for solving Nonlinear System of Equations by Solving Nonlinear Systems of Equations function fsolve ()
Determine the corresponding switch angle vector of different voltages modulation ratio；The Nonlinear System of Equations are as follows:
Wherein, UdcFor the NPC Multilevel Inverters DC voltage；M is voltage modulated ratio, and M is the harmonic wave eliminated
Number.
The present invention provides a kind of selective harmonic elimination pulsewidth modulation control method of deadband eliminating effect and its device,
After obtaining standard switch angle according to voltage modulated ratio and preset switches angle storage table, the output current direction of foundation current transformer prolongs
When the radian value be connected and the radian value turned off in advance come eliminate standard switch angle dead time effect influence, to standard switch angle
It is corrected, has the driving pulse in dead zone as benchmark output according to revised standard switch angle later.As it can be seen that this hair
The bright dead time effect for eliminating the standard switch angle as benchmark, when so that being subsequently generated driving pulse, not will receive dead zone shadow
Situations such as ringing and output voltage caused to deviate, and reduce the harmonic distortion of output voltage, optimize the harmonics level of current transformer.
And the present invention can directly export the driving pulse for carrying dead zone when generating driving pulse, it is no longer necessary to which increase is separately provided
The step of dead zone.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to institute in the prior art and embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the topological structure schematic diagram of diode clamp bit-type three-level current transformer；
Fig. 2 is output single-phase voltage reason of the diode clamp bit-type three-level current transformer in selective harmonic elimination pulsewidth modulation
Think waveform diagram；
The dead time schematic diagram when Fig. 3 is selective harmonic elimination pulsewidth modulation；
Fig. 4 is a kind of process of the selective harmonic elimination pulsewidth modulation control method of deadband eliminating effect provided by the invention
Schematic diagram；
Fig. 5 (a) is a kind of selective harmonic elimination pulsewidth modulation control method of deadband eliminating effect provided by the invention
The overall procedure schematic diagram of specific embodiment；
Fig. 5 (b) is the schematic diagram of the detailed process of II part of dead zone pulse product process in Fig. 5 (a)；
Fig. 5 (c) is the schematic diagram of the detailed process of III part of dead zone pulse product process in Fig. 5 (a)；
Fig. 5 (d) is the schematic diagram of the detailed process of IV part of dead zone pulse product process in Fig. 5 (a)；
Fig. 6 is the flow chart for the process that a kind of dead time effect provided by the invention is eliminated；
Fig. 7 is a kind of structure of the selective harmonic elimination pulsewidth modulation control device of deadband eliminating effect provided by the invention
Schematic diagram.
Specific embodiment
Core of the invention be to provide a kind of deadband eliminating effect selective harmonic elimination pulsewidth modulation control method and its
Device, can influence of the deadband eliminating effect to the driving pulse of current transformer, optimize the harmonics level of current transformer.
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, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The present invention provides a kind of selective harmonic elimination pulsewidth modulation control methods of deadband eliminating effect, are used for diode
Clamper type NPC Multilevel Inverters, shown in Figure 4, Fig. 4 is a kind of particular harmonic of deadband eliminating effect provided by the invention
Eliminate the schematic diagram of the process of pulse width modulation control method；This method comprises:
Step s1: Current Voltage closed-loop control is carried out to NPC Multilevel Inverters, calculates voltage modulated ratio and reality in real time
Shi Xiangwei；
Wherein, voltage modulated ratio refers to current transformer output AC voltage fundamental voltage amplitude and current transformer input direct-current voltage value
The ratio between.
Step s2: according to voltage modulated than inquiry preset switches angle storage table, voltage modulated is obtained than corresponding one group of mark
Quasi- switching angle；
Step s3: according to the output current directions of NPC Multilevel Inverters, Delayed conducting radian value and turn off in advance
Radian value is modified standard switch angle, eliminates the dead time effect in standard switch angle, obtains one group of amendment standard switch angle；
Step s4: on the basis of correcting standard switch angle, angular interval locating for real-time phase is determined, according to angular interval
The corresponding driving pulse with dead zone of real-time angular is obtained with default mapping table, drives NPC Multilevel Inverters.
Specifically, the acquisition process of the radian value of Delayed conducting and the radian value turned off in advance are as follows:
Step s101: the time τ of Delayed conducting is determinedd1The time τ turned off in advanced2；
Step s102: delay is obtained according to the time of radian relational expression and Delayed conducting and time for turning off in advance and is led
Logical radian value Td1The radian value T turned off in advanced2, radian relational expression are as follows:
Wherein, τ0For the NPC Multilevel Inverters output phase voltage fundamental period.
It is understood that working as τd1And τd2When not being 0, current transformer is the mode that Delayed conducting set turns off in advance, when
τd1When=0, to shift to an earlier date shutdown mode merely, work as τd2It is simple Delayed conducting mode when=0；τd=τd1+τd2。
Shown in Figure 2, Fig. 2 is that diode clamp bit-type three-level current transformer is defeated in selective harmonic elimination pulsewidth modulation
Single-phase voltage ideal waveform figure out；Waveform, about α=pi/2 axial symmetry, is [0,2 π] in a primitive period in [0, π] section
About point (π, 0) central symmetry in section.(or it is radian, is denoted as comprising N number of perfect switch angle in a quarter period
α(1),α(2),…,α(k),…,α(N)).Wherein, the moment of α=0 zero level, α=pi/2 moment are positive level, and N is odd number, and N
Shown in the numerical relation following relationship of a switching angle:
For phase voltage u0, the output voltage itself known to the symmetry of waveform is free of even-order harmonic, humorous containing only odd-times
Wave, i.e. phase voltage u0It can be analyzed to:
Wherein, ω is the angular frequency of phase voltage, bnIt may be expressed as:
The Nonlinear System of Equations relational expression write is arranged the vector being made of each switching angle are as follows:
Wherein, UdcFor NPC Multilevel Inverters DC voltage；M is voltage modulated ratio, and M is the overtone order eliminated.
Above-mentioned Nonlinear System of Equations is solved by Solving Nonlinear Systems of Equations function fsolve () later, that is, determines different electricity
Press the corresponding switch angle vector of modulation ratio；And then obtain preset switches angle storage table.
It is further known that the acquisition process of preset section pulse corresponding relationship specifically:
Step s201: ideal standard switching angle and ideal standard pulse are determined according to ideal standard monophasic waveform；
Step s202: the driving pulse of each power device is compared with ideal standard pulse, according to ideal standard
Switching angle, the radian value of Delayed conducting and the radian value that turns off in advance, determine the angle of one group of driving pulse at each state
Range intervals；
Step s203: the corresponding relationship between record all angles range intervals and the state of driving pulse is preset
Mapping table.
It is shown in Figure 3, the dead time schematic diagram when Fig. 3 is selective harmonic elimination pulsewidth modulation；
Under ideal situation (no switching dead), driving pulse g1, g2, g3, g4 are according to ideal standard switching angle position alpha (k)
Make corresponding high and low level switching, with [0, pi/2) in the section [α (k), α (k+1)] for (k is odd number): g2 ≡ 1, g4 ≡
0；When α ∈ [α (k), α (k+1)) when, g1=1, g3=0；Whenα (k+1)) when, g1=0, g3=1.
In Fig. 3, when switching dead (being provided with dead time) is arranged, is combined with Delayed conducting and turn off dead zone mould in advance
It is analyzed for formula: g2 ≡ 1, g4 ≡ 0；As α ∈ [α (k)-Td2, α (k)+Td1) when, g1=0, g3=0；When α ∈ [α (k)+
Td1, α (k+1)-Td2) when, g1=1, g3=0；As α ∈ [α (k+1)-Td2, α (k+1)+Td1) when, g1=0, g3=0.
Accordingly analysis it is available [0, pi/2) pair between all angles range intervals in section and the state of driving pulse
Should be related to, referring to table 1, table 1 be α ∈ [0, pi/2) when mapping table.
1 α ∈ of table [0, pi/2) when mapping table
It can similarly obtain, [pi/2, π), [π, 3 pi/2s), [3 pi/2s, 2 π) mapping table in section, respectively referring to table 2, table 3
With table 4.
2 α ∈ of table [pi/2, π) when mapping table
3 α ∈ of table [π, 3 pi/2s) when mapping table
4 α ∈ of table [3 pi/2s, 2 π) when mapping table
Further, in step s4, real-time phase can be directly determined and be in which section in table, output should later
The corresponding pulse signal in section.
In another specific embodiment, for convenient for software realization, referring to shown in Fig. 5 (a) (b) (c) (d), Fig. 5 (a) is
Overall procedure schematic diagram, wherein comprising α ∈ [0, pi/2) specific schematic diagram；Fig. 5 (b) be α ∈ [pi/2, π) part schematic diagram；
Fig. 5 (c) be α ∈ [π, 3 pi/2s) part schematic diagram；Fig. 5 (d) be α ∈ [3 pi/2s, 2 π) part schematic diagram；Integer variable k is used
In each switching angle of traversal and angular range section.
It is understood that can be obtained according to experiment, in current transformer ioWhen > 0, dead time effect is equivalent to outputs positive voltage less
Pulse, as go > 0, the Delayed conducting of g1 turns off influence output voltage in advance, and the Delayed conducting of g3, turns off in advance not
Influence output voltage；As go < 0, the Delayed conducting of g2, turn off in advance influence output voltage, and the Delayed conducting of g4, in advance
Shutdown does not influence output voltage.ioWhen<0, dead time effect is equivalent to outputs negative voltage pulse less: as go>0, g3's prolongs
When conducting, turn off influence output voltage in advance, and the Delayed conducting of g1, turn off do not influence output voltage in advance；When go < 0
When, the Delayed conducting of g4, turn off in advance influence output voltage, and the Delayed conducting of g2, turn off in advance do not influence output electricity
Pressure.Thus pulse signal g1~g4 dead time effect truth table such as table 5 is drawn, wherein ' 1 ' indicates to influence output voltage, ' 0 ' then table
Showing does not influence output voltage.
5 pulse signal g1~g4 dead time effect truth table of table
It can be obtained based on dead time effect truth table, in a preferred embodiment, shown in Figure 6, Fig. 6 is provided by the invention one
The flow chart for the process that kind dead time effect is eliminated；The process of step s3 specifically:
Step s301: for being in each periodStandard switch angle α in range0(h), enable h in [1, N]
In the range of traverse, if h be odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)-Td1；If h is odd number io< 0 or
H is even number and io> 0, then enable α (h)=α0(h)+Td2；N is the total number at one group of standard switch angle；
Step s302: for being in each periodStandard switch angle α in range0(h), enable h in [1, N]
In the range of traverse, if h be odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)-Td2；If h is odd number io< 0 or
H is even number and io> 0, then enable α (h)=α0(h)+Td1；
Step s303: for being in each periodStandard switch angle α in range0(h), enable h [1,
N] in the range of traverse, if h be odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)+Td2；If h is odd number io<0
Or h is even number and io> 0, then enable α (h)=α0(h)-Td1；
Step s304: for being in each periodStandard switch angle α in range0(h), enable h [1,
N] in the range of traverse, if h be odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)+Td1；If h is odd number io<0
Or h is even number and io> 0, then enable α (h)=α0(h)-Td2。
Preferably, the present invention can be used for two level current transformer of diode clamp bit-type or three-level current transformer or other
The current transformer of level, specifically can as needed depending on.
The present invention provides a kind of selective harmonic elimination pulsewidth modulation control methods of deadband eliminating effect, according to voltage
Output current direction, Delayed conducting after modulation ratio and preset switches angle storage table obtain standard switch angle, according to current transformer
Radian value and the radian value turned off in advance influence to eliminate the dead time effect at standard switch angle, are repaired to standard switch angle
Just, the driving pulse in dead zone is had as benchmark output according to revised standard switch angle later.As it can be seen that this invention removes
The dead time effect at the standard switch angle as benchmark, when so that being subsequently generated driving pulse, not will receive dead zone influences and causes
Situations such as output voltage deviates, and reduce the harmonic distortion of output voltage, optimize the harmonics level of current transformer.
The present invention also provides a kind of selective harmonic elimination pulsewidth modulation control devices of deadband eliminating effect, are used for two poles
Pipe wrench bit-type NPC Multilevel Inverters, shown in Figure 7, Fig. 7 is a kind of the specific humorous of deadband eliminating effect provided by the invention
The structural schematic diagram of wave elimination impulse-width modulation control device.The device includes:
Initial parameter obtains module 1, for carrying out Current Voltage closed-loop control to NPC Multilevel Inverters, calculates in real time
Voltage modulated ratio and real-time phase；
Switching angle enquiry module 3, for, than inquiry preset switches angle storage table, obtaining voltage modulated ratio according to voltage modulated
Corresponding one group of standard switch angle；
Dead time effect cancellation module 4, the arc for output current direction, Delayed conducting according to NPC Multilevel Inverters
Angle value and the radian value turned off in advance are modified standard switch angle, eliminate the dead time effect in standard switch angle, obtain one
Group amendment standard switch angle；
Pulse generation module 5, for determining angular interval locating for real-time phase on the basis of correcting standard switch angle,
The corresponding driving pulse with dead zone of real-time angular is obtained according to angular interval and default mapping table, drives NPC how electric
Flat current transformer；
Switching angle storage table generation module 5, for obtaining preset switches angle storage table；
Radian value obtains module 6, for predefining the radian value and the radian value that turns off in advance of Delayed conducting；
Section relationship determination module 7, for default mapping table to be obtained ahead of time.
Wherein, radian value obtains module 6 and specifically includes:
Postpone determination unit, for determining the time τ of Delayed conductingd1The time τ turned off in advanced2；
Radian value converting unit, the time turned off for the time according to radian relational expression and Delayed conducting and in advance
Obtain the radian value T of Delayed conductingd1The radian value T turned off in advanced2, radian relational expression are as follows:
Wherein, τ0For the NPC Multilevel Inverters output phase voltage fundamental period.
It is further known that section relationship determination module 7 specifically includes:
Angular range interval division unit, for determining ideal standard switching angle and reason according to ideal standard monophasic waveform
Think calibration pulse；The driving pulse of each power device is compared with ideal standard pulse, foundation ideal standard switching angle,
The radian value of Delayed conducting and the radian value turned off in advance determine the angular range area of one group of driving pulse at each state
Between；
Corresponding relationship recording unit, for recording the corresponding pass between all angles range intervals and the state of driving pulse
System obtains default mapping table.
In a preferred embodiment, dead time effect cancellation module 4 specifically includes:
First interval eliminates unit, for for being in each periodStandard switch angle α in range0
(h), h is enabled to traverse in the range of [1, N], if h is odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)-Td1；
If h is odd number io< 0 or h is even number and io> 0, then enable α (h)=α0(h)+Td2；N is the total number at one group of standard switch angle；
Second interval eliminates unit, for for being in each periodStandard switch angle α in range0
(h), h is enabled to traverse in the range of [1, N], if h is odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)-Td2；
If h is odd number io< 0 or h is even number and io> 0, then enable α (h)=α0(h)+Td1；
3rd interval eliminates unit, for for being in each periodStandard switch angle α in range0
(h), h is enabled to traverse in the range of [1, N], if h is odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)+Td2；
If h is odd number io< 0 or h is even number and io> 0, then enable α (h)=α0(h)-Td1；
Unit is eliminated in 4th section, for for being in each periodStandard switch angle α in range0
(h), h is enabled to traverse in the range of [1, N], if h is odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)+Td1；
If h is odd number io< 0 or h is even number and io> 0, then enable α (h)=α0(h)-Td2。
Wherein, switching angle storage table generation module 5 specifically includes:
Pattern determining unit is come for solving Nonlinear System of Equations by Solving Nonlinear Systems of Equations function fsolve ()
Determine the corresponding switch angle vector of different voltages modulation ratio；Nonlinear System of Equations are as follows:
Wherein, UdcFor NPC Multilevel Inverters DC voltage；M is voltage modulated ratio, and M is the overtone order eliminated.
Preferably, the present invention can be used for two level current transformer of diode clamp bit-type or three-level current transformer or other
The current transformer of level, specifically can as needed depending on.
The present invention provides a kind of selective harmonic elimination pulsewidth modulation control devices of deadband eliminating effect, according to voltage
Output current direction, Delayed conducting after modulation ratio and preset switches angle storage table obtain standard switch angle, according to current transformer
Radian value and the radian value turned off in advance influence to eliminate the dead time effect at standard switch angle, are repaired to standard switch angle
Just, the driving pulse in dead zone is had as benchmark output according to revised standard switch angle later.As it can be seen that this invention removes
The dead time effect at the standard switch angle as benchmark, when so that being subsequently generated driving pulse, not will receive dead zone influences and causes
Situations such as output voltage deviates, and reduce the harmonic distortion of output voltage, optimize the harmonics level of current transformer.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (8)
1. a kind of selective harmonic elimination pulsewidth modulation control method of deadband eliminating effect, how electric for diode clamp bit-type NPC
Flat current transformer characterized by comprising
Current Voltage closed-loop control is carried out to the NPC Multilevel Inverters, calculates voltage modulated ratio and real-time phase in real time；
According to the voltage modulated than inquiry preset switches angle storage table, obtains the voltage modulated and opened than corresponding one group of standard
Close angle；
According to the output current direction of the NPC Multilevel Inverters, the radian value of Delayed conducting and the radian value that turns off in advance
The standard switch angle is modified, the dead time effect in the standard switch angle is eliminated, obtains one group of amendment standard switch
Angle；
On the basis of the amendment standard switch angle, angular interval locating for the real-time phase is determined, according to the angular area
Between with default mapping table obtain the corresponding driving pulse with dead zone of the real-time angular, drive the more level of the NPC
Current transformer；
Wherein, the output current direction i according to the NPC Multilevel Inverterso, Delayed conducting radian value Td1With in advance
The radian value T of shutdownd2To the standard switch angle α0(h) it is modified, eliminates the dead time effect in the standard switch angle, obtain
To the process of one group of amendment standard switch angle α (h) specifically:
For being in each periodStandard switch angle α in range0(h), h is enabled to traverse in the range of [1, N],
If h is odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)-Td1；If h is odd number io< 0 or h is even number and io>
0, then enable α (h)=α0(h)+Td2；N is the total number at one group of standard switch angle；
For being in each periodStandard switch angle α in range0(h), h is enabled to traverse in the range of [1, N],
If h is odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)-Td2；If h is odd number io< 0 or h is even number and io>
0, then enable α (h)=α0(h)+Td1；
For being in each periodStandard switch angle α in range0(h), enable h in the range of [1, N] time
It goes through, if h is odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)+Td2；If h is odd number io< 0 or h be even number and
io> 0, then enable α (h)=α0(h)-Td1；
For being in each periodStandard switch angle α in range0(h), enable h in the range of [1, N] time
It goes through, if h is odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)+Td1；If h is odd number io< 0 or h be even number and
io> 0, then enable α (h)=α0(h)-Td2。
2. the method according to claim 1, wherein the radian value of the Delayed conducting and the radian turned off in advance
The acquisition process of value are as follows:
Determine the time τ of Delayed conductingd1The time τ turned off in advanced2；
Time and the time turned off in advance according to radian relational expression and the Delayed conducting obtain the delay and lead
Logical radian value Td1The radian value T turned off in advanced2, the radian relational expression are as follows:
Wherein, τ0For the NPC Multilevel Inverters output phase voltage fundamental period.
3. the method according to claim 1, wherein the acquisition process of the default mapping table specifically:
Ideal standard switching angle and ideal standard pulse are determined according to ideal standard monophasic waveform；
The driving pulse of each power device is compared with the ideal standard pulse, is switched according to the ideal standard
Angle, the radian value of the Delayed conducting and the radian value that turns off in advance, determine the angle of one group of driving pulse at each state
Range intervals；
The corresponding relationship between each angular range section and the state of driving pulse is recorded, the default corresponding pass is obtained
It is table.
4. the method according to claim 1, wherein the acquisition process of preset switches angle storage table is specific
Are as follows:
For solving Nonlinear System of Equations by Solving Nonlinear Systems of Equations function fsolve (), to determine different voltages modulation ratio
Corresponding switch angle vector；The Nonlinear System of Equations are as follows:
Wherein, UdcFor the NPC Multilevel Inverters DC voltage；M is voltage modulated ratio, and M is the overtone order eliminated.
5. a kind of selective harmonic elimination pulsewidth modulation control device of deadband eliminating effect, how electric for diode clamp bit-type NPC
Flat current transformer characterized by comprising
Initial parameter obtains module, for carrying out Current Voltage closed-loop control to the NPC Multilevel Inverters, calculates electricity in real time
Press modulation ratio and real-time phase；
Switching angle enquiry module, for, than inquiry preset switches angle storage table, obtaining the voltage tune according to the voltage modulated
System is than corresponding one group of standard switch angle；
Dead time effect cancellation module, the radian for output current direction, Delayed conducting according to the NPC Multilevel Inverters
Value and the radian value turned off in advance are modified the standard switch angle, eliminate the dead time effect in the standard switch angle,
Obtain one group of amendment standard switch angle；
Pulse generation module, for determining angular area locating for the real-time phase on the basis of the amendment standard switch angle
Between, the corresponding driving pulse with dead zone of the real-time angular is obtained according to the angular interval and default mapping table,
Drive the NPC Multilevel Inverters；
Switching angle storage table generation module, for obtaining preset switches angle storage table；
Radian value obtains module, for predefining the radian value and the radian value turned off in advance of the Delayed conducting；
Section relationship determination module, for the default mapping table to be obtained ahead of time；
Wherein, the dead time effect cancellation module specifically includes:
First interval eliminates unit, for for being in each periodStandard switch angle α in range0(h), h is enabled
It is traversed in the range of [1, N], if h is odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)-Td1；If h is surprise
Number io< 0 or h is even number and io> 0, then enable α (h)=α0(h)+Td2；N is the total number at one group of standard switch angle；
Second interval eliminates unit, for for being in each periodStandard switch angle α in range0(h), h is enabled
It is traversed in the range of [1, N], if h is odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)-Td2；If h is surprise
Number io< 0 or h is even number and io> 0, then enable α (h)=α0(h)+Td1；
3rd interval eliminates unit, for for being in each periodStandard switch angle α in range0(h),
H is enabled to traverse in the range of [1, N], if h is odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)+Td2；If h is
Odd number io< 0 or h is even number and io> 0, then enable α (h)=α0(h)-Td1；
Unit is eliminated in 4th section, for for being in each periodStandard switch angle α in range0(h),
H is enabled to traverse in the range of [1, N], if h is odd number and io> 0 or h is even number and io< 0, then enable α (h)=α0(h)+Td1；If h is
Odd number io< 0 or h is even number and io> 0, then enable α (h)=α0(h)-Td2。
6. device according to claim 5, which is characterized in that the radian value obtains module and specifically includes:
Postpone determination unit, for determining the time τ of Delayed conductingd1The time τ turned off in advanced2；
Radian value converting unit described is turned off for the time according to radian relational expression and the Delayed conducting and in advance
Time obtains the radian value T of the Delayed conductingd1The radian value T turned off in advanced2, the radian relational expression are as follows:
Wherein, τ0For the NPC Multilevel Inverters output phase voltage fundamental period.
7. device according to claim 5, which is characterized in that the section relationship determination module specifically includes:
Angular range interval division unit, for determining ideal standard switching angle and ideal mark according to ideal standard monophasic waveform
Quasi- pulse；The driving pulse of each power device is compared with the ideal standard pulse, is opened according to the ideal standard
Angle, the radian value of the Delayed conducting and the radian value that turns off in advance are closed, determines the angle of one group of driving pulse at each state
Spend range intervals；
Corresponding relationship recording unit, for recording the corresponding pass between each angular range section and the state of driving pulse
System, obtains the default mapping table.
8. device according to claim 5, which is characterized in that the switching angle storage table generation module specifically includes:
Pattern determining unit, for solving Nonlinear System of Equations by Solving Nonlinear Systems of Equations function fsolve (), to determine
The corresponding switch angle vector of different voltages modulation ratio；The Nonlinear System of Equations are as follows:
Wherein, UdcFor the NPC Multilevel Inverters DC voltage；M is voltage modulated ratio, and M is the overtone order eliminated.
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| CN110365245B (en) * | 2018-03-26 | 2021-04-23 | 中车株洲电力机车研究所有限公司 | SVPWM control method, system and device for eliminating dead zone effect |
| CN108667373B (en) * | 2018-04-20 | 2021-05-25 | 浙江大学 | Direct-current bus voltage fluctuation compensation method based on selective harmonic elimination pulse width modulation |
| CN111384886B (en) * | 2018-12-29 | 2021-09-17 | 北汽福田汽车股份有限公司 | PWM modulation method and device for motor control |
| CN110768557B (en) * | 2019-09-24 | 2021-06-25 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | H-bridge five-level active neutral point clamped inverter and modulation strategy thereof |
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