CN107196542A - A kind of selective harmonic elimination pulsewidth modulation becomes mode control method and its device - Google Patents
A kind of selective harmonic elimination pulsewidth modulation becomes mode control method and its device Download PDFInfo
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- CN107196542A CN107196542A CN201710417646.3A CN201710417646A CN107196542A CN 107196542 A CN107196542 A CN 107196542A CN 201710417646 A CN201710417646 A CN 201710417646A CN 107196542 A CN107196542 A CN 107196542A
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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
- H02M7/487—Neutral point clamped inverters
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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
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Abstract
Become mode control method and its device the invention discloses a kind of selective harmonic elimination pulsewidth modulation, for NPC Multilevel Inverters, be included under the uneven operating mode of power network net pressure, calculate current voltage modulation ratio m and phase angle；Voltage modulated ratio is compared with default modulation ratio threshold value, if less than default modulation ratio threshold value, selecting the first control model, if more than default modulation ratio threshold value, selecting the second control model；First control model is used to control the output current of current transformer to balance and whole odd harmonics are 0, and the second control model is used to control the subharmonic of n=6j ± 1 to be positive integer for 0, j；According to the control model inquiry corresponding preset switches angle storage table of selection, voltage modulated is obtained than corresponding switch angle；According to phase angle and obtained switch angle generation pulse signal driving current transformer.The present invention can ensure that output current is controllable as far as possible, and ensure to reduce major harmonic as far as possible, improve control effect.
Description
Technical field
The present invention relates to current transformer control technology field, more particularly to a kind of selective harmonic elimination pulsewidth modulation becomes pattern
Control method and its device.
Background technology
Diode clamp bit-type (NPC, Neutral point clamped) three-level current transformer is very suitable for the middle big work(of pressure
Rate industry unsteady flow transmission (such as locomotive traction, offshore wind farm, metallurgy rolling mill, mine hoist, marine propeller) field, with reference to
The high withstand 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 transformers is as shown in figure 1, wherein S1、S2、S3、S4For full-controlled switch device, each is opened
Close device all one fly-wheel diode (D of inverse parallel1~D4), D5、D6For clamp diode, DC bus capacitor C1=C2, electric capacity electricity
Pressure value is Udc/ 2, output current of converter is io。
Selective harmonic elimination pulsewidth modulation (SHEPWM) is also referred to as switching-node preset PWM, is by staircase waveform
" groove " of preset appropriate location optionally eliminates specific subharmonic, due to low-order harmonic can be completely eliminated, in output
Have when waveform quality is identical compared with low switching frequency, solve caused by the factors such as device lifetime, switching loss, radiating limitation
Middle pressure great power conversion circuit occasion devices switch frequency only has the effective ways of hundreds of hertz and then the series of problems triggered.By voltage
The symmetry of waveform understands output voltage in itself containing only odd harmonics；Simultaneously for three-phase voltage balanced system, due to line electricity
3 subharmonic are cancelled out each other in pressure, thus conventional method be when setting up harmonic wave eliminating Nonlinear System of Equations ignore 3 integral multiple it is strange
Subharmonic, only consider to eliminate 3 times for several times beyond odd harmonics.
But as user steps up to converter system grid adaptability requirement, tolerance unbalanced source voltage degree into
To examine a Key Performance Indicator of converter system.And in the SHEPWM modulated process of NPC three-level current transformers, in power network
The control effect for controlling harmonic to suppress is balanced under uneven operating mode for output current poor, out-of-control phenomenon easily occur.
Therefore, how a kind of good selective harmonic elimination pulsewidth modulation of control effect is provided and becomes mode control method and its dress
It is the problem of those skilled in the art need solution at present to put.
The content of the invention
Become mode control method and its device it is an object of the invention to provide a kind of selective harmonic elimination pulsewidth modulation, can
Ensure that output current is controllable as far as possible, and ensure to reduce major harmonic as far as possible, improve control effect.
In order to solve the above technical problems, becoming Schema control side the invention provides a kind of selective harmonic elimination pulsewidth modulation
Method, for diode clamp bit-type NPC Multilevel Inverters, including：
In the case where power network net presses uneven operating mode, current voltage modulated is calculated than m and phase angle；
The voltage modulated ratio and default modulation ratio threshold value are compared, if less than the default modulation ratio threshold value,
The first control model is selected, if more than the default modulation ratio threshold value, selecting the second control model；Wherein, first control
Molding formula is used to control the output current of the NPC Multilevel Inverters to balance and whole odd harmonics are 0, second control
Molding formula is used to control nth harmonic to be positive integer for 0, n=6j ± 1, j；
According to the control model inquiry corresponding preset switches angle storage table of selection, the voltage modulated is obtained than corresponding
Switch angle；
The many level unsteady flows of NPC are driven according to the phase angle and obtained switch angle generation pulse signal
Device.
Preferably, second control model specifically includes the first subpattern and the second subpattern, first submodule
Formula is used to control the output current of the NPC Multilevel Inverters to balance and nth harmonic is 0, and second subpattern is used to control
Make the output voltage balance of the NPC Multilevel Inverters and nth harmonic is 0.
Preferably, it is described to be compared the voltage modulated ratio and default modulation ratio threshold value, if less than the default tune
System then selects the first control model than threshold value, if more than the default modulation ratio threshold value, selecting the process of the second control model
Specially：
By the voltage modulated than being compared respectively with the first default modulation ratio threshold value and the second default modulation ratio threshold value
Compared with；
If less than the described first default modulation ratio threshold value, selecting the first control model；
If more than the described second default modulation ratio threshold value, selecting the second control model.
Preferably, the acquisition process of preset switches angle storage table is：
First Nonlinear System of Equations is solved by Solving Nonlinear Systems of Equations function fsolve (), to determine first control
Different voltage modulateds are than corresponding switch angle vector under conditions of molding formula；First Nonlinear System of Equations is：
Second Nonlinear System of Equations is solved by the Solving Nonlinear Systems of Equations function fsolve (), to determine described the
Different voltage modulateds are than corresponding switch angle vector under conditions of two control models；Second Nonlinear System of Equations is：
Wherein, UdcFor the NPC Multilevel Inverters DC voltage.
In order to solve the above technical problems, becoming Schema control dress present invention also offers a kind of selective harmonic elimination pulsewidth modulation
Put, for diode clamp bit-type NPC Multilevel Inverters, including：
Modulation ratio determining module, under the not uneven operating mode of power network net pressure, calculating current voltage modulated than m and phase
Parallactic angle；
Mode selection module, for the voltage modulated ratio and default modulation ratio threshold value to be compared, if less than described
Default modulation ratio threshold value, then select the first control model, if more than the default modulation ratio threshold value, selection second controls mould
Formula；Wherein, first control model is used to control the output current of the NPC Multilevel Inverters to balance and whole odd-times
Harmonic wave is 0, and second control model is used to control nth harmonic to be positive integer for 0, n=6j ± 1, j；
Switching angle enquiry module, inquires about corresponding preset switches angle storage table for the control model according to selection, obtains
The voltage modulated is than corresponding switch angle；
Pulse control module, for according to the phase angle and the generation pulse signal driving of the obtained switch angle
The NPC Multilevel Inverters；
Switching angle storage table generation module, for obtaining preset switches angle storage table.
Preferably, the mode selection module is specifically included：
First choice unit, for the voltage modulated ratio to be compared with the first default modulation ratio threshold value, obtains the
One comparative result；
Second selecting unit, for that will be compared the voltage modulated ratio with the second default modulation ratio threshold value, is obtained
Second comparative result；
Mode selecting unit, for being analyzed according to first comparative result with second comparative result, if institute
Voltage modulated ratio is stated less than the described first default modulation ratio threshold value, then the first control model is selected, if the voltage modulated is than big
In the described second default modulation ratio threshold value, then the second control model is selected.
Preferably, the switching angle storage table generation module is specifically included：
First mode determining unit, for solving the first non-linear side by Solving Nonlinear Systems of Equations function fsolve ()
Journey group, come different voltage modulateds under conditions of determining first control model than corresponding switch angle vector；Described first
Nonlinear System of Equations is：
Second mode determining unit, for solving the second non-thread by the Solving Nonlinear Systems of Equations function fsolve ()
Property equation group, to determine that different voltage modulateds are than corresponding switch angle vector under conditions of second control model；It is described
Second Nonlinear System of Equations is：
Become mode control method and its device the invention provides a kind of selective harmonic elimination pulsewidth modulation, for diode
Clamper type NPC Multilevel Inverters, under unbalanced source voltage operating mode, voltage modulated is obtained than selection phase according to current calculating
The control model answered, in voltage modulated than in the case of relatively low, selection control output current balance now current transformer be in it is complete
Controllable state, therefore whole odd harmonics can be made to be 0；In the case that voltage modulated is higher, show that current transformer has gone out
The situation of existing overvoltage, if now wanting to ensure that current transformer is controllable, it is positive integer for 0, n=6j ± 1, j only to control nth harmonic；
Afterwards corresponding switching angle and then output pulse signal driving NPC Multilevel Inverters are selected according to control model.It can be seen that, this hair
It is bright to ensure that current transformer is controllable all the time in the case of unbalanced source voltage, and output current is balanced as far as possible, even if defeated
Go out current imbalance and also ensure that main subharmonic is 0, control effect is good.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, below will be to institute in prior art and embodiment
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also be obtained according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is the topological structure schematic diagram of diode clamp bit-type three-level current transformer；
Fig. 2 becomes the flow of the process of mode control method for a kind of selective harmonic elimination pulsewidth modulation that the present invention is provided
Figure；
Fig. 3 is output single-phase voltage reason of the diode clamp bit-type three-level current transformer in selective harmonic elimination pulsewidth modulation
Think oscillogram；
The positive-negative sequence current that Fig. 4 becomes in mode control method for a kind of selective harmonic elimination pulsewidth modulation that the present invention is provided
The schematic diagram of control process；
Fig. 5 becomes the structural representation of mode control device for a kind of selective harmonic elimination pulsewidth modulation that the present invention is provided.
Embodiment
The core of the present invention is to provide a kind of selective harmonic elimination pulsewidth modulation and becomes mode control method and its device, can
Ensure that output current is controllable as far as possible, and ensure to reduce major harmonic as far as possible, improve control effect.
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Become mode control method the invention provides a kind of selective harmonic elimination pulsewidth modulation, for NPC (Neutral
Point clamped, diode clamp bit-type) Multilevel Inverters, it is shown in Figure 2, Fig. 2 for the present invention provide it is a kind of specific
Harmonics elimination pulsewidth modulation becomes the flow chart of the process of mode control method；This method includes：
Step s1：In the case where power network net presses uneven operating mode, current voltage modulated is calculated than m and phase angle；
Step s2：Voltage modulated ratio is compared with default modulation ratio threshold value, if less than default modulation ratio threshold value, selecting
The first control model is selected, if more than default modulation ratio threshold value, selecting the second control model；Wherein, the first control model is used for
Control the output current of NPC Multilevel Inverters to balance and whole odd harmonics are 0, the second control model is used to control n times
Harmonic wave is that 0, n=6j ± 1, j is positive integer；
Wherein, default modulation ratio threshold value here be preferably not less than voltage modulated under the first control model than it is maximum controllable
Value, because under the first control model, harmonic suppression effect is preferable and output current can be controlled to balance, typically only in voltage
Modulation ratio is too high, in the case of the first control model is uncontrollable, can just switch to the second control model and be controlled.
Step s3：According to the control model inquiry corresponding preset switches angle storage table of selection, voltage modulated comparison is obtained
The switch angle answered；
Step s4：According to phase angle and obtained switch angle generation pulse signal driving NPC Multilevel Inverters.
Wherein, voltage modulated ratio refers to current transformer output AC voltage fundamental voltage amplitude and current transformer input direct voltage value
The ratio between.
It is understood that the phase angular region and voltage modulated corresponding to different control models are advance than scope
It is determined by experiment.Preset switches angle storage table is to determine switch angle and voltage modulated ratio under different control models in advance
Corresponding relation and obtain after being stored.
Specifically, the acquisition process of preset switches angle storage table here is：
First Nonlinear System of Equations is solved by Solving Nonlinear Systems of Equations function fsolve (), to determine the first control mould
Different voltage modulateds are than corresponding switch angle vector under conditions of formula；First Nonlinear System of Equations is：
Second Nonlinear System of Equations is solved by Solving Nonlinear Systems of Equations function fsolve (), to determine the second control mould
Different voltage modulateds are than corresponding switch angle vector under conditions of formula；Second Nonlinear System of Equations is：
Selective harmonic elimination pulsewidth modulation (SHEPWM, Selective Harmonic Elimination in the present invention
Pulse Width Modulation), also referred to as switching-node preset PWM, SHEPWM realization principle is that phase voltage is entered
Row Fourier decomposition, pressure fundamental voltage amplitude is particular value, and by staircase waveform preset appropriate " groove " come optionally
It is zero to make selected some low frequency subharmonic, and the determination of " groove " position need to set up non-to eliminate specific subharmonic as object function
System of linear equations, the information of each switching angle is solved by numerical computations.Current common practice is advance solution nonlinear equation
By gained " groove " position it is that switch angle information is stored in memory after group, (presets and open by tabling look-up during normal operation
Close angle storage table) read corresponding switch angle information.
Shown in Figure 3, Fig. 3 is that diode clamp bit-type three-level current transformer is defeated in selective harmonic elimination pulsewidth modulation
Go out single-phase voltage ideal waveform figure；Waveform, on α=pi/2 axial symmetry, is [0,2 π] in a primitive period in [0, π] is interval
On point (π, 0) Central Symmetry in interval.(or it is radian, is designated as comprising N number of perfect switch angle in a quarter cycle
α(1)、α(2)、…、α(k)、…、α(N)).Wherein, the moment zero level of α=0, α=pi/2 moment are positive level, and N is odd number, and N
Shown in the numerical relation relationship below of individual switching angle：
For phase voltage u0, understand that output voltage is free of even-order harmonic in itself by the symmetry of waveform, it is humorous containing only odd-times
Ripple, i.e. phase voltage u0It can be analyzed to：
Wherein, ω is the angular frequency of phase voltage, bnIt is represented by：
It is to the Nonlinear System of Equations relational expression that the vector row being made up of each switching angle are write：
It is further known that, for three-phase three-line system, when not considering voltage harmonic, power network phase voltage uga,b,cCan table
Show as follows：
Wherein, V+、V-Respectively voltage positive sequence, the amplitude of negative sequence component,For corresponding initial phase.If V-=
0 line voltage balance；Otherwise V-≠ 0 unbalanced source voltage.
Because current transformer is by adjusting itself output voltage uca,b,cIn real time change be added in wave filter (mainly filter inductance,
Assuming that Three-phase electric-wave filter parameter is consistent) the voltage u at two endsLa,b,cTo control the change of output current, therefore (to export fundamental wave electricity
Exemplified by the grid-connected converter of stream), to ensure output current balance, it is necessary to be added in the balance of voltage on three pole reactor, i.e. VL-For
0, uLa,b,cIt is represented by following relational expression：
Wherein, VL、The respectively amplitude of inductive drop, initial phase.
Further, according to Kirchhoff's second law (KVL), there is uca,b,c=uga,b,c+uLa,b,c, i.e. current transformer exports electric
Press uca,b,cFor：
Wherein, Vc+、Vc-Respectively output voltage positive sequence, the amplitude of negative sequence component,For corresponding initial phase.
It can be seen from relation above formula, under unbalanced source voltage operating mode, it is ensured that output current is balanced, current transformer is defeated
Go out voltage inevitable uneven, now in three-phase voltage 3 odd-multiple harmonic wave can not cancel out each other for several times.Therefore to ensure unsteady flow
Device output current can be refined as the first Nonlinear System of Equations without 3 odd-multiple harmonic wave for several times, Nonlinear System of Equations：
In addition, under unbalanced source voltage operating mode, if keeping current transformer output voltage balance, (output current is uneven
Weighing apparatus), then in three-phase voltage 3 odd-multiple harmonic wave is cancelled out each other for several times, 3 now need not be additionally limited in Nonlinear System of Equations
Harmonic wave is 0 to odd-multiple for several times, and it is 0 that need to only limit n=6j ± 1 (j is positive integer) subharmonic, under this restrictive condition, even if
Modulation ratio exceeds the control range of the first control model, can be also controlled by the second control model, therefore the second control model
Corresponding Nonlinear System of Equations can be refined as the second Nonlinear System of Equations：
Wherein, UdcFor the NPC Multilevel Inverters DC voltage.
It can be obtained by experiment, after the first Nonlinear System of Equations is solved using function fsolve (), can obtain voltage modulated
The controlled range interval of ratio be approximately m ∈ [0,1), using function fsolve () solve the second Nonlinear System of Equations after, can obtain
Voltage modulated than controlled range interval be approximately m ∈ [0,1.6), therefore, it can m ∈ [0,1) it is interval in controlled using first
Molding formula is controlled, beyond m ∈ [0,1) it is interval after be controlled using the second control model, it is certainly, of the invention not limit
The concrete numerical value of default modulation ratio threshold value.
Preferably, the second control model specifically includes the first subpattern and the second subpattern, and the first subpattern is used
In controlling the output current of NPC Multilevel Inverters to balance and nth harmonic is 0, the second subpattern is used to control many level of NPC to become
Flow the output voltage balance of device and nth harmonic is 0.
Wherein, depending on specifically chosen first subpattern or the second subpattern can be needed by user's foundation, the present invention is not limited
Alternative condition between fixed two patterns.
In addition, step s2 process is specially：
By voltage modulated than being compared respectively with the first default modulation ratio threshold value and the second default modulation ratio threshold value, if
Less than the first default modulation ratio threshold value, then the first control model is selected, if more than the second default modulation ratio threshold value, selecting second
Control model.
It is understood that the first default modulation ratio threshold value is less than the second modulation ratio threshold value, it is between the two pattern switching
Transition region.In pattern switching transition region, its control model is still in the control model before switching transition, pattern switching transition region
Play a part of delay variation, be now the first control for example, being less than the first default modulation ratio threshold value than before from voltage modulated
Pattern, afterwards voltage modulated than Dietary behavior switch transition region, now still keep the first control model.
Preferably, shown in Figure 4, Fig. 4 becomes mould for a kind of selective harmonic elimination pulsewidth modulation that the present invention is provided
The schematic diagram of positive-negative sequence current control process in formula control method；Wherein, SwTo become mode selection switch, using positive and negative sequence
Under dq synchronous coordinate systems current separation control (subscript+,-represent positive and negative sequence synchronous coordinate system respectively, subscript d, q is represented respectively
D axles, q axis components under synchronous coordinate system)； For d axles, the instruction of q shaft currents, i under positive-sequence coordinate systemd+(id-)、iq+(iq-) be
D axles, q shaft current feedback quantities, u just under (negative) sequence coordinate systemd+(ud-)、uq+(uq-) for d axles, q shaft voltages under just (negative) sequence coordinate system
Feedforward amount, U+(U-)、θ+(θ-) for reference voltage amplitude, phase, m under just (negative) sequence coordinate systema,b,c、θa,b,cFor three-phase ABC coordinates
Voltage modulated ratio, phase under system.Select after control model, control the process of the reference voltage of NPC Multilevel Inverters specific
For：
Determine that NPC Multilevel Inverters are just under various control models according to default positive-negative sequence voltage magnitude phase relation formula
Negative phase-sequence reference voltage；
Presetting positive sequence voltage amplitude phase relational expression is：
Presetting negative sequence voltage amplitude phase relational expression is：
Determine that how electric NPC is under various control models according to positive-negative sequence reference voltage and three-phase voltage amplitude phase relational expression
The three-phase reference voltage of flat current transformer；
It should be noted that aforesaid operations are before formal modulation control, advance manual control becomes mode selection switch
Conduction mode, and calculate the modulation ratio scope under the pattern and phase angular region, above-mentioned three-phase reference voltage is modulation ratio model
Enclose and the middle parameter during the range computation of phase angle.
It is understood that separating control strategy by using positive-negative sequence current, it ensure that in certain modulation ratio model
Enclose under interior unbalanced source voltage operating mode output current of converter balance and THD (Total Harmonic Distortion,
Total percent harmonic distortion) it is minimum.
Preferably, the present invention can be used for the level current transformer of diode clamp bit-type two or three-level current transformer or other
The current transformer of level, specifically can as needed depending on.
Become mode control method the invention provides a kind of selective harmonic elimination pulsewidth modulation, for diode clamp bit-type
NPC Multilevel Inverters, it is more corresponding than selecting according to obtained voltage modulated is currently calculated under unbalanced source voltage operating mode
Control model, in voltage modulated than in the case of relatively low, selection control output current balance now current transformer be in it is fully controllable
State, therefore whole odd harmonics can be made to be 0；In the case that voltage modulated is higher, show that current transformer had occurred
The situation of pressure, if now wanting to ensure that current transformer is controllable, it is positive integer for 0, n=6j ± 1, j only to control nth harmonic；Afterwards
Corresponding switching angle and then output pulse signal driving NPC Multilevel Inverters are selected according to control model.It can be seen that, the present invention exists
In the case of unbalanced source voltage, it ensure that current transformer is controllable all the time, and output current is balanced as far as possible, even if output electricity
Stream imbalance also ensure that main subharmonic is 0, and control effect is good.
Become mode control device present invention also offers a kind of selective harmonic elimination pulsewidth modulation, for diode clamp bit-type
NPC Multilevel Inverters, shown in Figure 5, Fig. 5 becomes pattern control for a kind of selective harmonic elimination pulsewidth modulation that the present invention is provided
The structural representation of device processed.The device includes：
Modulation ratio determining module 1, under the not uneven operating mode of power network net pressure, calculate current voltage modulated than m and
Phase angle；
Mode selection module 2, for voltage modulated ratio to be compared with default modulation ratio threshold value, if less than default modulation
Than threshold value, then the first control model is selected, if more than default modulation ratio threshold value, selecting the second control model；Wherein, the first control
Molding formula is used to control the output current of NPC Multilevel Inverters to balance and whole odd harmonics are 0, and the second control model is used
It is positive integer in controlling nth harmonic for 0, n=6j ± 1, j；
Switching angle enquiry module 3, inquires about corresponding preset switches angle storage table for the control model according to selection, obtains
Voltage modulated is than corresponding switch angle；
Pulse control module 4, for generating pulse signal according to the obtained phase angle of calculating and obtained switch angle
Drive NPC Multilevel Inverters；
Switching angle storage table generation module 5, for obtaining preset switches angle storage table.
Wherein, mode selection module 2 is specifically included：
First choice unit, for voltage modulated ratio to be compared with the first default modulation ratio threshold value, obtains the first ratio
Relatively result；
Second selecting unit, for that will be compared voltage modulated ratio with the second default modulation ratio threshold value, obtains second
Comparative result；
Mode selecting unit, for being analyzed according to the first comparative result with the second comparative result, if voltage modulated ratio
Less than the first default modulation ratio threshold value, then the first control model is selected, if voltage modulated ratio is more than the second default modulation ratio threshold value,
Then select the second control model.
Wherein, switching angle storage table generation module 5 is specifically included：
First mode determining unit, for solving the first non-linear side by Solving Nonlinear Systems of Equations function fsolve ()
Journey group, come different voltage modulateds under conditions of determining the first control model than corresponding switch angle vector；First non-linear side
Cheng Zuwei：
Second mode determining unit, for solving the second non-linear side by Solving Nonlinear Systems of Equations function fsolve ()
Journey group, come different voltage modulateds under conditions of determining the second control model than corresponding switch angle vector；Second non-linear side
Cheng Zuwei：
Preferably, the present invention can be used for the level current transformer of diode clamp bit-type two or three-level current transformer or other
The current transformer of level, specifically can as needed depending on.
Become mode control device the invention provides a kind of selective harmonic elimination pulsewidth modulation, for diode clamp bit-type
NPC Multilevel Inverters, it is more corresponding than selecting according to obtained voltage modulated is currently calculated under unbalanced source voltage operating mode
Control model, in voltage modulated than in the case of relatively low, selection control output current balance now current transformer be in it is fully controllable
State, therefore whole odd harmonics can be made to be 0；In the case that voltage modulated is higher, show that current transformer had occurred
The situation of pressure, if now wanting to ensure that current transformer is controllable, it is positive integer for 0, n=6j ± 1, j only to control nth harmonic；Afterwards
Corresponding switching angle and then output pulse signal driving NPC Multilevel Inverters are selected according to control model.It can be seen that, the present invention exists
In the case of unbalanced source voltage, it ensure that current transformer is controllable all the time, and output current is balanced as far as possible, even if output electricity
Stream imbalance also ensure that main subharmonic is 0, and control effect is good.
The embodiment of each in this specification is described by the way of progressive, and what each embodiment was stressed is and other
Between the difference of embodiment, each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
For, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is said referring to method part
It is bright.
It should also be noted that, in this manual, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between there is any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that process, method, article or equipment including a series of key elements not only include that
A little key elements, but also other key elements including being not expressly set out, or also include be this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", is not arranged
Except also there is other identical element in the process including the key element, method, article or equipment.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for 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, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (7)
1. a kind of selective harmonic elimination pulsewidth modulation becomes mode control method, for diode clamp bit-type NPC Multilevel Inverters,
It is characterised in that it includes：
In the case where power network net presses uneven operating mode, current voltage modulated is calculated than m and phase angle；
The voltage modulated ratio and default modulation ratio threshold value are compared, if less than the default modulation ratio threshold value, selecting
First control model, if more than the default modulation ratio threshold value, selecting the second control model；Wherein, the first control mould
Formula is used to control the output current of the NPC Multilevel Inverters to balance and whole odd harmonics are 0, the second control mould
Formula is used to control nth harmonic to be positive integer for 0, n=6j ± 1, j；
According to the control model inquiry corresponding preset switches angle storage table of selection, the voltage modulated is obtained than corresponding switch
Angle；The NPC Multilevel Inverters are driven according to the phase angle and obtained switch angle generation pulse signal.
2. according to the method described in claim 1, it is characterised in that second control model specifically include the first subpattern with
And second subpattern, first subpattern is used to control the output current of the NPC Multilevel Inverters to balance and nth harmonic
For 0, second subpattern is used to control the output voltage of the NPC Multilevel Inverters to balance and nth harmonic is 0.
3. method according to claim 2, it is characterised in that described by the voltage modulated ratio and default modulation ratio threshold value
It is compared, if less than the default modulation ratio threshold value, selecting the first control model, if more than the default modulation ratio threshold
It is worth, then the process for selecting the second control model is specially：
By the voltage modulated than being compared respectively with the first default modulation ratio threshold value and the second default modulation ratio threshold value；
If less than the described first default modulation ratio threshold value, selecting the first control model；
If more than the described second default modulation ratio threshold value, selecting the second control model.
4. method according to claim 3, it is characterised in that the acquisition process of preset switches angle storage table is：
First Nonlinear System of Equations is solved by Solving Nonlinear Systems of Equations function fsolve (), to determine the first control mould
Different voltage modulateds are than corresponding switch angle vector under conditions of formula；First Nonlinear System of Equations is：
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</mfenced>
Second Nonlinear System of Equations is solved by the Solving Nonlinear Systems of Equations function fsolve (), to determine second control
Different voltage modulateds are than corresponding switch angle vector under conditions of molding formula；Second Nonlinear System of Equations is：
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Wherein, UdcFor the NPC Multilevel Inverters DC voltage.
5. a kind of selective harmonic elimination pulsewidth modulation becomes mode control device, for diode clamp bit-type NPC Multilevel Inverters,
It is characterised in that it includes：
Modulation ratio determining module, under the not uneven operating mode of power network net pressure, calculating current voltage modulated than m and phase
Angle；
Mode selection module, for the voltage modulated ratio and default modulation ratio threshold value to be compared, if default less than described
Modulation ratio threshold value, then select the first control model, if more than the default modulation ratio threshold value, selecting the second control model；Its
In, first control model is used to control the output current of the NPC Multilevel Inverters to balance and whole odd harmonics
For 0, second control model is used to control nth harmonic to be positive integer for 0, n=6j ± 1, j；
Switching angle enquiry module, corresponding preset switches angle storage table is inquired about for the control model according to selection, obtains described
Voltage modulated is than corresponding switch angle；
Pulse control module, for described according to the phase angle and the generation pulse signal driving of the obtained switch angle
NPC Multilevel Inverters；
Switching angle storage table generation module, for obtaining preset switches angle storage table.
6. device according to claim 5, it is characterised in that the mode selection module is specifically included：
First choice unit, for the voltage modulated ratio to be compared with the first default modulation ratio threshold value, obtains the first ratio
Relatively result；
Second selecting unit, for that will be compared the voltage modulated ratio with the second default modulation ratio threshold value, obtains second
Comparative result；
Mode selecting unit, for being analyzed according to first comparative result with second comparative result, if the electricity
Press modulation ratio to be less than the described first default modulation ratio threshold value, then select the first control model, if voltage modulated ratio is more than institute
The second default modulation ratio threshold value is stated, then selects the second control model.
7. device according to claim 6, it is characterised in that the switching angle storage table generation module is specifically included：
First mode determining unit, for solving the first nonlinear equation by Solving Nonlinear Systems of Equations function fsolve ()
Group, come different voltage modulateds under conditions of determining first control model than corresponding switch angle vector；Described first is non-
System of linear equations is：
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Second mode determining unit, for solving the second non-linear side by the Solving Nonlinear Systems of Equations function fsolve ()
Journey group, come different voltage modulateds under conditions of determining second control model than corresponding switch angle vector；Described second
Nonlinear System of Equations is：
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</mtable>
</mfenced>
<mo>.</mo>
</mrow>
2
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| CN112886590A (en) * | 2021-03-01 | 2021-06-01 | 中车株洲电力机车有限公司 | Traction network higher harmonic suppression method and system and rail transit vehicle |
| CN114144971A (en) * | 2019-07-23 | 2022-03-04 | 株式会社明电舍 | Power converter control system and control method using fixed pulse mode |
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