CN110504855A - A kind of SHEPWM control method and device of Multilevel Inverters multiple module paralleling - Google Patents
A kind of SHEPWM control method and device of Multilevel Inverters multiple module paralleling Download PDFInfo
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- CN110504855A CN110504855A CN201810474377.9A CN201810474377A CN110504855A CN 110504855 A CN110504855 A CN 110504855A CN 201810474377 A CN201810474377 A CN 201810474377A CN 110504855 A CN110504855 A CN 110504855A
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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
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
Abstract
The invention discloses SHEPWM control method, device and the computer readable storage mediums of a kind of Multilevel Inverters multiple module paralleling, this method comprises: calculating the voltage modulated ratio for obtaining current Multilevel Inverters and phase angle；According to voltage modulated than the switching angle storage table inquired under pre-stored complete collaborative control pattern, voltage modulated is obtained than corresponding switch angle；According to switch angle and phase angle, generates pulse signal and drive current Multilevel Inverters；The present invention utilizes the corresponding switching angle storage table for switching angle vector of the different voltages modulation ratio that each Multilevel Inverters under complete collaborative control pattern are stored in advance, SHEPWM Collaborative Control is carried out to multiple Multilevel Inverters in parallel, keep the overtone order of the external output voltage of parallel system higher, to reduce the total current THD of parallel system, the harmonic performance for optimizing parallel system, improves user experience.
Description
Technical field
The present invention relates to current transformer control technology field, in particular to a kind of Multilevel Inverters multiple module paralleling
SHEPWM control method, device and computer readable storage medium.
Background technique
Diode-clamped (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.NPC three-level current transformer three-phase topology is as shown in Figure 1, S1、S2、S3、S4For full-controlled switch device, each switching device
All one freewheeling diode (D of inverse parallel1~D4), D5、D6For clamp diode, DC bus capacitor C1=C2, capacitance voltage value is equal
For 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) by " groove " of appropriate location preset on staircase waveform come
Specific subharmonic is selectively eliminated, since low-order harmonic can be completely eliminated, is had when output waveform is identical in quality lower
Switching frequency is to solve because of device lifetime, switching loss, heat dissipation limitation etc. to press great power conversion circuit occasion device in caused by factors
Switching frequency only has the effective ways of several hundred hertz and then the series of problems of initiation.
In the prior art, Multilevel Inverters multiple module paralleling system, as two NPC three-level current transformers compose in parallel
NPC three-level current transformer Dual module parallel system (tri- level Dual module parallel system of NPC), can be in single Multilevel Inverters
Increase the total output capacity of system in the case that capacity is constant, and the redundancy running ability of system can be improved, meets high-power work
The demand in industry unsteady flow field.However, the overtone order of the external output voltage of parallel system is lower in the prior art, system total current
THD (Total Harmonic Distortion, total percent harmonic distortion) is excessively high, so that system harmonics performance is bad, is unfavorable for
User experience.Therefore, how the Multilevel Inverters in parallel system are controlled, guarantees the external output voltage of parallel system
Overtone order is higher, to reduce system total current THD, optimization system harmonic performance is urgent problem now.
Summary of the invention
The object of the present invention is to provide SHEPWM control method, device and the meters of a kind of Multilevel Inverters multiple module paralleling
Calculation machine readable storage medium storing program for executing, to reduce system total current by the Multilevel Inverters in SHEPWM Collaborative Control parallel system
THD, optimization system harmonic performance.
In order to solve the above technical problems, the present invention provides a kind of SHEPWM controlling party of Multilevel Inverters multiple module paralleling
Method, comprising:
Calculate the voltage modulated ratio for obtaining current Multilevel Inverters and phase angle；Wherein, current more level unsteady flows
Device is any Multilevel Inverters；
According to the voltage modulated than the switching angle storage table inquired under pre-stored complete collaborative control pattern, obtain
The voltage modulated is than corresponding switch angle；Wherein, the complete collaborative control pattern is for controlling current more level
The fundamental wave point of the respective output voltage of current transformer and other described Multilevel Inverters in parallel with the current Multilevel Inverters
It measures, it is big in 0 and parallel output total voltage that 3 are more than or equal in respective output voltage and is less than or equal to the odd harmonics of 2L-1
In be equal to 2L+1 and be less than or equal to preset first threshold value odd harmonics be 0, L be more than or equal to 2 and be less than or equal to N it is just whole
Number, N are that the ideal that the current Multilevel Inverters SHEPWM was controlled in a quarter primitive period of output single-phase voltage is opened
Close angle quantity；
According to the switch angle and the phase angle, generates pulse signal and drive the current Multilevel Inverters.
Optionally, the switching angle under the complete collaborative control pattern more pre-stored than inquiry according to the voltage modulated
Storage table, before obtaining the voltage modulated than corresponding switch angle, further includes:
Whether the control model for judging the current Multilevel Inverters is independent control mode；Wherein, the control mould
Formula includes the independent control mode and the complete collaborative control pattern；
If so, being stored according to the voltage modulated than the switching angle inquired under the pre-stored independent control mode
Table obtains the voltage modulated than corresponding switch angle；Wherein, the independent control mode is described current mostly electric for controlling
The odd harmonics more than or equal to 3 in the fundametal compoment and output voltage of the output voltage of flat current transformer are 0；
If it is not, then executing opening under the complete collaborative control pattern more pre-stored than inquiry according to the voltage modulated
Angle storage table is closed, the step of voltage modulated is than corresponding switch angle is obtained.
Optionally, opening under the complete collaborative control pattern more pre-stored than inquiry according to the voltage modulated is executed
Angle storage table is closed, before obtaining the step of voltage modulated is than corresponding switch angle, further includes:
Whether the control model for judging the current Multilevel Inverters is complete collaborative control pattern；Wherein, the control
Molding formula further includes part collaborative control pattern；
If so, executing opening under the complete collaborative control pattern more pre-stored than inquiry according to the voltage modulated
Angle storage table is closed, the step of voltage modulated is than corresponding switch angle is obtained；
If it is not, then according to the voltage modulated than inquiring the pre-stored current Multilevel Inverters and in described
The corresponding switching angle storage table of other described Multilevel Inverters of part collaborative control pattern, obtains the voltage modulated and compares
The switch angle answered；Wherein, the part collaborative control pattern for control the current Multilevel Inverters and in institute
The fundametal compoment of the respective output voltage of other described Multilevel Inverters of part collaborative control pattern is stated, in respective output voltage
Odd harmonics more than or equal to 3 and less than or equal to 2L-1 are to be more than or equal to 2L+1 in 0 and parallel output total voltage and be less than etc.
In the odd harmonics of default second threshold be 0.
Optionally, when the current Multilevel Inverters, other Multilevel Inverters are in parallel with one, and described work as
When preceding Multilevel Inverters and other described Multilevel Inverters are NPC three-level current transformer, under the independent control mode
Switching angle storage table acquisition process, comprising:
The first Nonlinear System of Equations is solved, determines the corresponding switching angle of different voltages modulation ratio under the independent control mode
Spend vector；First Nonlinear System of Equations are as follows:
Wherein, UdcFor the DC voltage of the current Multilevel Inverters；M is the voltage modulated ratio,It is described
Current Multilevel Inverters and the corresponding NPC three-level current transformer SHEPWM control output jointly of other described Multilevel Inverters
The vector of N number of perfect switch angle composition in a quarter primitive period of single-phase voltage,
The acquisition process of switching angle storage table under the complete collaborative control pattern, comprising:
The second Nonlinear System of Equations is solved, determines under the complete collaborative control pattern that different voltages modulation ratio is corresponding and opens
Close angle vector；Second Nonlinear System of Equations are as follows:
Wherein,Output single-phase is controlled for the corresponding NPC three-level current transformer SHEPWM of the current Multilevel Inverters
The vector of N number of perfect switch angle composition in a quarter primitive period of voltage, For it
The a quarter fundamental wave week of the corresponding NPC three-level current transformer SHEPWM control output single-phase voltage of his Multilevel Inverters
The vector of N number of perfect switch angle composition in phase,L≤N。
The present invention also provides a kind of SHEPWM control devices of Multilevel Inverters multiple module paralleling, comprising:
Computing module, for calculating the voltage modulated ratio and the phase angle that obtain current Multilevel Inverters；Wherein, described to work as
Preceding Multilevel Inverters are any Multilevel Inverters；
It switchs angle and obtains module, for according to the voltage modulated complete collaborative control pattern more pre-stored than inquiry
Under switching angle storage table, obtain the voltage modulated than corresponding switch angle；Wherein, the complete collaborative control pattern is used
In the control current Multilevel Inverters and other described Multilevel Inverters in parallel with the current Multilevel Inverters
The fundametal compoment of respective output voltage, be more than or equal in respective output voltage 3 and the odd harmonics less than or equal to 2L-1 be 0,
And be more than or equal to 2L+1 in parallel output total voltage and be less than or equal to the odd harmonics of preset first threshold value be 0, L for greater than etc.
In 2 and being less than or equal to the positive integer of N, N be the current Multilevel Inverters SHEPWM control output single-phase voltage four/
Perfect switch angle quantity in one primitive period；
Drive module, for it is described current more to generate pulse signal driving according to the switch angle and the phase angle
Level current transformer.
Optionally, the switch angle obtains module, comprising:
Judging submodule, for judging whether the control model of the current Multilevel Inverters is independent control mode；
If so, sending enabling signal to the first acquisition submodule；If it is not, then sending enabling signal to the second acquisition submodule；Wherein,
The control model includes the independent control mode and the complete collaborative control pattern；
First acquisition submodule, for according to the voltage modulated independent control mould more pre-stored than inquiry
Switching angle storage table under formula obtains the voltage modulated than corresponding switch angle；Wherein, the independent control mode is used for
It controls humorous more than or equal to 3 odd-times in the fundametal compoment and output voltage of the output voltage of the current Multilevel Inverters
Wave is 0；
Second acquisition submodule, for being controlled according to the voltage modulated than inquiring the pre-stored complete collaboration
Switching angle storage table under molding formula obtains the voltage modulated than corresponding switch angle.
Optionally, second acquisition submodule, comprising:
Judging unit, for judging whether the control model of the current Multilevel Inverters is complete Collaborative Control mould
Formula；If so, sending enabling signal to first acquisition unit；If it is not, then sending enabling signal to second acquisition unit；Wherein,
The control model further includes part collaborative control pattern；
The first acquisition unit, for according to the voltage modulated complete Collaborative Control more pre-stored than inquiry
Switching angle storage table under mode obtains the step of voltage modulated is than corresponding switch angle；
The second acquisition unit, for being become according to the voltage modulated than inquiring pre-stored current more level
Device switching angle storage table corresponding with other described Multilevel Inverters in the part collaborative control pattern is flowed, institute is obtained
Voltage modulated is stated than corresponding switch angle；Wherein, the part collaborative control pattern becomes for controlling current more level
Device and the fundametal compoment with the respective output voltage of other described Multilevel Inverters in the part collaborative control pattern are flowed,
Be more than or equal in respective output voltage 3 and the odd harmonics less than or equal to 2L-1 be to be greater than in 0 and parallel output total voltage etc.
It is 0 in 2L+1 and less than or equal to the odd harmonics of default second threshold.
Optionally, when the current Multilevel Inverters, other Multilevel Inverters are in parallel with one, and described work as
When preceding Multilevel Inverters and other described Multilevel Inverters are NPC three-level current transformer, the device further include:
First switch angle storage table obtains module, for solving the first Nonlinear System of Equations, determines the independent control mould
The corresponding switch angle vector of different voltages modulation ratio, obtains the switching angle storage table under the independent control mode under formula；Institute
State the first Nonlinear System of Equations are as follows:
Wherein, UdcFor the DC voltage of the current Multilevel Inverters；M is the voltage modulated ratio,It is described
Current Multilevel Inverters and the corresponding NPC three-level current transformer SHEPWM control output jointly of other described Multilevel Inverters
The vector of N number of perfect switch angle composition in a quarter primitive period of single-phase voltage,
Second switch angle storage table obtains module, for solving the second Nonlinear System of Equations, determines the complete collaboration control
The corresponding switch angle vector of different voltages modulation ratio under molding formula, the switching angle obtained under the complete collaborative control pattern are deposited
Store up table；Second Nonlinear System of Equations are as follows:
Wherein,Output single-phase is controlled for the corresponding NPC three-level current transformer SHEPWM of the current Multilevel Inverters
The vector of N number of perfect switch angle composition in a quarter primitive period of voltage, For it
The a quarter fundamental wave week of the corresponding NPC three-level current transformer SHEPWM control output single-phase voltage of his Multilevel Inverters
The vector of N number of perfect switch angle composition in phase,L≤N。
In addition, being deposited on the computer readable storage medium the present invention also provides a kind of computer readable storage medium
Computer program is contained, the computer program realizes Multilevel Inverters as described in any one of the above embodiments when being executed by processor
The step of SHEPWM control method of multiple module paralleling.
The SHEPWM control method of a kind of Multilevel Inverters multiple module paralleling provided by the present invention, comprising: calculating obtains
Take voltage modulated ratio and the phase angle of current Multilevel Inverters；Wherein, current Multilevel Inverters are any more level unsteady flows
Device；According to voltage modulated than the switching angle storage table inquired under pre-stored complete collaborative control pattern, voltage modulated is obtained
Than corresponding switch angle；Wherein, complete collaborative control pattern for control current Multilevel Inverters and with current more level
The fundametal compoment of the respective output voltage of other Multilevel Inverters of current transformer parallel connection, be more than or equal in respective output voltage 3 and
Odd harmonics less than or equal to 2L-1 are to be more than or equal to 2L+1 in 0 and parallel output total voltage and be less than or equal to default first
The odd harmonics of threshold value are 0, L for the positive integer more than or equal to 2 and less than or equal to N, and N is current Multilevel Inverters SHEPWM
Control the perfect switch angle quantity in a quarter primitive period of output single-phase voltage；It is raw according to switch angle and phase angle
Current Multilevel Inverters are driven at pulse signal；
As it can be seen that the present invention passes through according to the switching angle under voltage modulated complete collaborative control pattern more pre-stored than inquiry
Storage table obtains voltage modulated than corresponding switch angle, can use be stored in advance under complete collaborative control pattern it is each more
The switching angle storage table of the corresponding switch angle vector of the different voltages modulation ratio of level current transformer, to multiple more level in parallel
Current transformer carries out SHEPWM Collaborative Control, keeps the overtone order of the external output voltage of parallel system higher, to reduce parallel connection
The total current THD of system, optimizes the harmonic performance of parallel system, improves user experience.In addition, the present invention also provides one
The SHEPWM control device and computer readable storage medium of kind Multilevel Inverters multiple module paralleling equally have above-mentioned beneficial
Effect.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the topological structure schematic diagram of diode clamp bit-type three-level current transformer；
Fig. 2 is a kind of SHEPWM control method of Multilevel Inverters multiple module paralleling provided by the embodiment of the present invention
Flow chart；
Fig. 3 is the parallel system topology schematic diagram of two three-phase NPC three-level current transformer parallel connections；
Fig. 4 is output single-phase voltage ideal waveform figure of the diode clamp bit-type three-level current transformer in SHEPWM；
Fig. 5 be NPC three-level current transformer SHEPWM independent control under switching angle vector and voltage modulated than relationship song
Line chart；
Fig. 6 is switching angle vector and voltage modulated under the complete Collaborative Control of SHEPWM of two NPC three-level current transformers
Compare graph of relation；
Fig. 7 is grid-connected total current waveform figure of two NPC three-level current transformers under SHEPWM independent control；
Fig. 8 is grid-connected total current spectrum analysis figure of two NPC three-level current transformers under SHEPWM independent control；
Fig. 9 is grid-connected total current waveform figure of two NPC three-level current transformers under the complete Collaborative Control of SHEPWM；
Figure 10 is grid-connected total current spectrum analysis of two NPC three-level current transformers under the complete Collaborative Control of SHEPWM
Figure；
Figure 11 is a kind of SHEPWM control device of Multilevel Inverters multiple module paralleling provided by the embodiment of the present invention
Structure chart.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, 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.
Referring to FIG. 2, Fig. 2 is a kind of SHEPWM of Multilevel Inverters multiple module paralleling provided by the embodiment of the present invention
The flow chart of control method.This method may include:
Step 101: calculating the voltage modulated ratio for obtaining current Multilevel Inverters and phase angle；Wherein, current more level
Current transformer is any Multilevel Inverters.
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.
It should be noted that the present embodiment is the Multilevel Inverters multimode to compose in parallel to multiple Multilevel Inverters
It is carried out for a Multilevel Inverters (current Multilevel Inverters) progress SHEPWM Collaborative Control in block parallel system
It shows, it, can be sequentially or simultaneously using same or similar with the present embodiment for other Multilevel Inverters in parallel system
Mode carry out SHEPWM Collaborative Control, the present embodiment does not do any restrictions to this.Preferably, this step can obtain to calculate
The corresponding voltage modulated ratio of whole Multilevel Inverters and phase angle in parallel system, to whole Multilevel Inverters
Carry out parallel SHEPWM Collaborative Control.
It is understood that the purpose of the present embodiment can be to utilize opening under pre-stored complete collaborative control pattern
Angle storage table is closed to realize to whole Multilevel Inverters progress SHEPWM Collaborative Control, for more level unsteady flows current in this step
The voltage modulated of device can use same as the prior art or similar than the specific acquisition process and acquisition modes with phase angle
Mode realizes that the present embodiment does not do any restrictions to this.
Specifically, when parallel system is composed in parallel by two NPC three-level current transformers, as shown in figure 3, including three-phase electricity
Net, two-winding transformer (primary side gets access to grid, and 2 vice-side windings can also be directly accessed power grid without transformer), 2 three
The connection of phase NPC three-level current transformer module (module 1, module 2) common DC bus voltage, each NPC three-level current transformer pass through
Respective filter inductance LkAccess a vice-side winding, and load RL, wherein ua,b,cFor three-phase power grid voltage, iak、ibk、ick
Exporting three-phase current for k-th converter module, (subscript k is module No., k=1 or 2), ia,b,cFor three-phase grid total current,
Ud1、Ud2For the upper and lower capacitance voltage of DC side.
Step 102: according to voltage modulated than the switching angle storage table inquired under pre-stored complete collaborative control pattern,
Voltage modulated is obtained than corresponding switch angle.
Wherein, complete collaborative control pattern is for controlling current Multilevel Inverters and in parallel with current Multilevel Inverters
The respective output voltage of other Multilevel Inverters fundametal compoment, be more than or equal to 3 in respective output voltage and be less than or equal to 2L-
1 odd harmonics are the odd-times for being more than or equal to 2L+1 in 0 and parallel output total voltage and being less than or equal to preset first threshold value
Harmonic wave is 0, L for the positive integer more than or equal to 2 and less than or equal to N, and N is that current Multilevel Inverters SHEPWM controls output single-phase
Perfect switch angle quantity in a quarter primitive period of voltage.
It is corresponding, whole more level unsteady flows in complete collaborative control pattern control Multilevel Inverters multiple module paralleling system
It is default in 0 for being more than or equal to 2L+1 in the parallel output total voltage of device and being less than or equal to the odd harmonics of preset first threshold value
First threshold, can be by designer according to practical scene and user demand self-setting, simultaneously such as Multilevel Inverters multimode
When connection system is the Multilevel Inverters Dual module parallel connection of two Multilevel Inverters composition, preset first threshold value be can be set to
4N-2L-1, i.e., complete collaborative control pattern can control level unsteady flow more than two in Multilevel Inverters Dual module parallel system
Being more than or equal to 2L+1 and the odd harmonics less than or equal to 4N-2L-1 in the parallel output total voltage of device is 0.The present embodiment for
Any restrictions are not done in the specific setting of preset first threshold value.
It is understood that the purpose of this step can be to utilize the switch under pre-stored complete collaborative control pattern
Angle storage table obtains the voltage modulated of each Multilevel Inverters in parallel system than corresponding switch angle, so that control is simultaneously
The fundametal compoment of the respective output voltage of Multilevel Inverters in connection system, be more than or equal to 3 and be less than in respective output voltage etc.
It is to be more than or equal to 2L+1 in 0 and parallel output total voltage and be less than or equal to preset first threshold value in the odd harmonics of 2L-1
Odd harmonics are 0, realize the SHEPWM Collaborative Control of whole Multilevel Inverters in parallel system, keep parallel system externally defeated
The overtone order of voltage is higher out, reduces the total current THD of parallel system, optimizes the harmonic performance of parallel system.
It is corresponding, based on the SHEPWM control method of Multilevel Inverters multimode provided by the present embodiment, according to simultaneously
The particular number of Multilevel Inverters in connection system, complete collaborative control pattern control Multilevel Inverters respectively output voltage
In be 0 odd harmonics range (such as larger than be equal to 3 and be less than or equal to 2L-1) select and/or parallel output total voltage in for
The range of 0 odd harmonics (is more than or equal to 2L+1 and is less than or equal to preset first threshold value) selection, can be by designer's root
Adaptive change factually is done with scene, the present embodiment does not do any restrictions to this.
Specifically, storing complete Collaborative Control mould using the switching angle storage table under complete collaborative control pattern in this step
The respective corresponding switch angle vector of different voltages modulation ratio of whole Multilevel Inverters, can also be deposited using other forms under formula
Whole Multilevel Inverters respectively corresponding switch angle vector of different voltages modulation ratio is stored up under complete collaborative control pattern, as long as
Whole Multilevel Inverters respectively corresponding switching angle of different voltages modulation ratio can be stored in advance under complete collaborative control pattern
Vector is spent, for specific storage form, the present embodiment does not do any restrictions.
It should be noted that the present embodiment is to will do it SHEPWM association with whole Multilevel Inverters in parallel system
Some in parallel system is avoided with the displaying carried out for control for the redundancy running ability of further parallel system
When something goes wrong, other Multilevel Inverters run the case where going wrong, side provided by the present embodiment to Multilevel Inverters
Method can also include that each Multilevel Inverters of parallel system are carried out with the function of SHEPWM independent control.
That is, can also include judging whether the control model of current Multilevel Inverters is only before this step
Vertical control model；If so, being obtained according to voltage modulated than the switching angle storage table inquired under pre-stored independent control mode
Take voltage modulated than corresponding switch angle；If it is not, thening follow the steps 102.Wherein, the control model of current Multilevel Inverters
It may include independent control mode and complete collaborative control pattern, independent control mode is for controlling current Multilevel Inverters
The odd harmonics more than or equal to 3 in the fundametal compoment and output voltage of output voltage are 0.
Specifically, by taking the parallel system that two NPC three-level current transformers shown in Fig. 3 compose in parallel as an example, tri- level of NPC
Current transformer SHEPWM output single-phase voltage ideal waveform as shown in figure 4, waveform in [0, π] section about α=pi/2 axial symmetry,
About point (π, 0) central symmetry within a primitive period i.e. section [0,2 π], N number of perfect switch in a quarter primitive period
(radian is denoted as α at angle1、α2、…、αk、…、αN).When using the moment of α=0 zero level, α=pi/2 moment positive electricity flat-die type powdered N for
Odd number, and the numerical relation at N number of perfect switch angle is shown below:
0<α1<α2<…<αk<…<αN-1<αN<π/2
For phase voltage uo, 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 can uoIt can be analyzed to:
Wherein, ω is the angular frequency of phase voltage, bnIt may be expressed as:
The realization principle of SHEPWM is that Fourier decomposition is carried out to phase voltage, and pressure fundamental voltage amplitude is particular value, and makes to select
Fixed several low frequency subharmonic are zero, establish Nonlinear System of Equations, the switching angle met the requirements are sought, to by each switching angle
The vector of compositionArrange the Nonlinear System of Equations relational expression write are as follows:
Wherein, UdcFor NPC three-level current transformer DC voltage；M is voltage modulated ratio, and M is eliminable overtone order.
In the SHEPWM independent control of NPC three-level current transformer, (two NPC three-level current transformers in parallel can share identical one group
Switching angleA little N number of equations can be at most arranged under the premise of equation group has solution) when, Nonlinear System of Equations is shown below:
Wherein, 1. sub- equation is used to control fundamental voltage output of voltage component, 2. sub- equation group is used to control output voltage odd times
Harmonic content is 0.Corresponding, the present embodiment can also include the acquisition process of the switching angle storage table under independent control mode,
Such as a upper Nonlinear System of Equations can be solved by Solving Nonlinear Systems of Equations function fsolve (), determine independent control mode
The corresponding switch angle vector of lower different voltages modulation ratio.
By taking 9 switching angles as an example (N=9), at this time in the SHEPWM independent control nonlinear equation of NPC three-level current transformer
Group can be embodied as being shown below:
9 equations for including in above formula, one of equation (1.) are used to control the fundametal compoment of output voltage, remaining 8
A equation (2.) for control in output voltage 3 times, 5 times, 7 times ..., 17 inferior odd harmonics contents be 0.It can be by adopting
A upper equation group is solved with the Solving Nonlinear Systems of Equations function fsolve () that Matlab tool provides, different electricity can be obtained
Press switching angle vector when modulation ratio mHomologous thread it is as shown in Figure 5.
In the complete Collaborative Control of the SHEPWM of two NPC three-level current transformers, (two NPC three-level current transformers in parallel are each
From switching angle can be denoted as respectivelyWithThe two is mutual
It is independent, under the premise of equation group has solution in can at most arrange a little 2N equations) when, Nonlinear System of Equations is shown below:
Wherein, sub- equation group 1. (contain two equations) for controlling two NPC three-level current transformers respectively output voltage
Fundametal compoment, 2. sub- equation group (contains 2L-2 equation) for controlling two NPC three-level current transformers, respectively output voltage is lower
Secondary odd harmonic (3 times, 5 times, 7 times ..., (2L-1) it is secondary) content be 0,3. sub- equation group (contains 2N-2L equation) and is used to control
Make two NPC three-level current transformer parallel output total voltages compared with high order odd harmonic ((2L+1) is secondary, (2L+3) is secondary ..., (4N-
It is 2L-1) secondary) content be 0.It should be noted that L≤N in a upper equation group, reasonably selecting L by designer or user can be protected
Demonstrate,proving higher harmonics content in two NPC three-level current transformer parallel output total voltages is 0 to optimize harmonic performance, works as L=N
When degenerate be NPC three-level current transformer SHEPWM independent control.Corresponding, the present embodiment can also include complete Collaborative Control
It is non-such as to solve upper one by Solving Nonlinear Systems of Equations function fsolve () for the acquisition process of switching angle storage table under mode
System of linear equations determines the corresponding switch angle vector of different voltages modulation ratio under complete collaborative control pattern.
Equally by taking 9 switching angles as an example (N=9), and L=8 is taken without loss of generality, at this time two tri- level unsteady flows of NPC
The SHEPWM Collaborative Control Nonlinear System of Equations of device can be embodied as being shown below:
It include 18 equations in above formula, wherein 2 equations (1.) respectively export for controlling two NPC three-level current transformers
The fundametal compoment of voltage, 14 equations (2.) are for 3 times, 5 times, 7 in two NPC three-level current transformers of control respectively output voltage
It is secondary ..., 15 inferior odd harmonics contents be 0, last 2 equations (3.) for control control two NPC three-level current transformers
17 times of parallel output total voltage, 19 subharmonic contents be 0.The Solving Nonlinear Systems of Equations provided by using Matlab tool
Function fsolve () solves a upper equation group, can be obtained switching angle vector when different modulating ratio mHomologous thread
(solid line is corresponding as shown in Figure 6Dotted line is corresponding)。
It should be noted that when in parallel system including more than two Multilevel Inverters, in order in parallel system
In some Multilevel Inverters when something goes wrong further promoted parallel system externally export electricity pressure overtone order, can be right
Other Multilevel Inverters carry out the part SHEPWM Collaborative Control, that is to say, that method provided by the present embodiment is in addition to can be with
The Multilevel Inverters that other do not go wrong are carried out outside SHEPWM independent control.It can not also go wrong to other more
Level current transformer carries out SHEPWM Collaborative Control, further promotes the functionality of parallel system.
It, can be with that is, after the control model of the current Multilevel Inverters of determination is not independent control mode
Including judging whether the control model of current Multilevel Inverters is complete collaborative control pattern；If it is not, then according to voltage modulated
It is corresponded to than inquiring pre-stored current Multilevel Inverters with other Multilevel Inverters in part collaborative control pattern
Switching angle storage table, obtain voltage modulated than corresponding switch angle；If so, thening follow the steps 102；If it is not, then according to electricity
Pressure modulation ratio inquires pre-stored current Multilevel Inverters and other more level unsteady flows in part collaborative control pattern
The corresponding switching angle storage table of device obtains voltage modulated than corresponding switch angle；Wherein, the control of current Multilevel Inverters
Mode further includes part collaborative control pattern；Part collaborative control pattern for control current Multilevel Inverters and in portion
The fundametal compoment of the respective output voltage of other Multilevel Inverters of point collaborative control pattern is more than or equal in respective output voltage
3 and be to be more than or equal to 2L+1 in 0 and parallel output total voltage and be less than or equal to default the less than or equal to the odd harmonics of 2L-1
The odd harmonics of two threshold values are 0.
It is corresponding, the control of part collaborative control pattern control current Multilevel Inverters and be in part Collaborative Control mould
It is more than or equal to 2L+1 in the parallel output total voltage of other Multilevel Inverters of formula and is less than or equal to the surprise of default second threshold
Harmonic wave is the default second threshold in 0 for several times, can be by designer according to practical scene and user demand self-setting, specifically
Can be using similar mode be arranged with preset first threshold value, the present embodiment is same for the specific setting for presetting second threshold
Do not do any restrictions.
Specifically, the corresponding switching angle storage table of pre-stored independent control mode, is referred to above-mentioned two NPC tri-
The acquisition process correspondence of the switching angle storage table under independent collaborative control pattern in the parallel system of level current transformer composition is set
It sets；Pre-stored complete collaborative control pattern and the corresponding switching angle storage table of part collaborative control pattern, Ke Yican
According to obtaining for the switching angle storage table under complete collaborative control pattern in the parallel system of above-mentioned two NPC three-level current transformer composition
Process is taken to be correspondingly arranged.For pre-stored independent control mode, complete collaborative control pattern and part collaborative control pattern
The specific acquisition modes of corresponding switching angle storage table, can be by designer or user according to practical scene and user's need
Self-setting is sought, the present embodiment does not do any restrictions to this.
Step 103: according to switch angle and phase angle, generating pulse signal and drive current Multilevel Inverters.
It is understood that the purpose of the present embodiment can be to utilize opening under pre-stored complete collaborative control pattern
Angle storage table is closed to realize to whole Multilevel Inverters progress SHEPWM Collaborative Control, more level current for basis in this step
The switch angle of current transformer and phase angle generate the detailed process that pulse signal drives current Multilevel Inverters, can use
Same as the prior art or similar mode realizes that the present embodiment does not do any restrictions to this.
Specifically, in order to verify the SHEPWM controlling party of Multilevel Inverters multiple module paralleling provided by the present embodiment
Method, it is soft by using Matlab/Simulink to the correctness of the SHEPWM Collaborative Control of multiple Multilevel Inverters in parallel
Part builds the simulation model of the parallel system composed in parallel with two NPC three-level current transformers shown in Fig. 3, power grid voltage rating
Us=3kV, fundamental frequency fo=50Hz, NPC three-level current transformer DC voltage Udc=5000V.Select SHEPWM modulation methods
Method, 9 switching angles (N=9) in a quarter primitive period, and SHEPWM control method provided by the present invention is used, it gives
The parallel system that two NPC three-level current transformers compose in parallel exports the watt current that specified virtual value is 1kA to power grid.
Grid-connected total current waveform of two NPC three-level current transformers under SHEPWM independent control is as shown in fig. 7, frequency spectrum point
It is as shown in Figure 8 to analyse result；Grid-connected total current waveform such as Fig. 9 institute of two NPC three-level current transformers under SHEPWM Collaborative Control
Show, result of spectrum analysis is as shown in Figure 10；Harmonic content very little, 19 subharmonic within total current 17 times when SHEPWM independent control
Content is larger, THD 7.51%；Total current not only harmonic content very little within 17 times, 19 subharmonic when SHEPWM Collaborative Control
The same very little of content, and THD is only 1.66%, harmonic performance is more excellent.
In the present embodiment, the embodiment of the present invention passes through according to voltage modulated complete Collaborative Control mould more pre-stored than inquiry
Switching angle storage table under formula obtains voltage modulated than corresponding switch angle；Wherein, complete collaborative control pattern is for controlling
The fundamental wave of the respective output voltage of current Multilevel Inverters and other Multilevel Inverters in parallel with current Multilevel Inverters
Component, be more than or equal in respective output voltage 3 and the odd harmonics less than or equal to 2L-1 be in 0 and parallel output total voltage
It is 0 more than or equal to 2L+1 and less than or equal to the odd harmonics of preset first threshold value；It can use and collaboration control completely is stored in advance
The switching angle storage table of the corresponding switch angle vector of the different voltages modulation ratio of each Multilevel Inverters under molding formula, to simultaneously
Multiple Multilevel Inverters of connection carry out SHEPWM Collaborative Control, keep the overtone order of the external output voltage of parallel system higher,
To reduce the total current THD of parallel system, the harmonic performance of parallel system is optimized, user experience is improved.
Figure 11 is please referred to, Figure 11 is a kind of Multilevel Inverters multiple module paralleling provided by the embodiment of the present invention
The structure chart of SHEPWM control device.The apparatus may include:
Computing module 100, for calculating the voltage modulated ratio and the phase angle that obtain current Multilevel Inverters；Wherein, when
Preceding Multilevel Inverters are any Multilevel Inverters；
It switchs angle and obtains module 200, for according to voltage modulated complete collaborative control pattern more pre-stored than inquiry
Under switching angle storage table, obtain voltage modulated than corresponding switch angle；Wherein, complete collaborative control pattern is worked as controlling
The fundamental wave point of the respective output voltage of preceding Multilevel Inverters and other Multilevel Inverters in parallel with current Multilevel Inverters
It measures, it is big in 0 and parallel output total voltage that 3 are more than or equal in respective output voltage and is less than or equal to the odd harmonics of 2L-1
In be equal to 2L+1 and be less than or equal to preset first threshold value odd harmonics be 0, L be more than or equal to 2 and be less than or equal to N it is just whole
Number, N are the perfect switch angle in a quarter primitive period of current Multilevel Inverters SHEPWM control output single-phase voltage
Quantity；
Drive module 300, for generating pulse signal and driving current more level unsteady flows according to switch angle and phase angle
Device.
Optionally, switch angle obtains module 200, comprising:
Judging submodule, for judging whether the control model of current Multilevel Inverters is independent control mode；If so,
Then enabling signal is sent to the first acquisition submodule；If it is not, then sending enabling signal to the second acquisition submodule；Wherein, it controls
Mode includes independent control mode and complete collaborative control pattern；
First acquisition submodule, for according to the switching angle under voltage modulated independent control mode more pre-stored than inquiry
Storage table obtains voltage modulated than corresponding switch angle；Wherein, independent control mode is for controlling current Multilevel Inverters
Output voltage fundametal compoment and output voltage in more than or equal to 3 odd harmonics be 0；
Second acquisition submodule, for according to opening under voltage modulated complete collaborative control pattern more pre-stored than inquiry
Angle storage table is closed, obtains voltage modulated than corresponding switch angle.
Optionally, the second acquisition submodule, comprising:
Judging unit, for judging whether the control model of current Multilevel Inverters is complete collaborative control pattern；If
It is then to send enabling signal to first acquisition unit；If it is not, then sending enabling signal to second acquisition unit；Wherein, mould is controlled
Formula further includes part collaborative control pattern；
First acquisition unit, for according to the switch under voltage modulated complete collaborative control pattern more pre-stored than inquiry
Angle storage table obtains the step of voltage modulated is than corresponding switch angle；
Second acquisition unit, for according to voltage modulated current Multilevel Inverters more pre-stored than inquiry and in portion
Divide the corresponding switching angle storage table of other Multilevel Inverters of collaborative control pattern, obtains voltage modulated than corresponding switching angle
Degree；Wherein, part collaborative control pattern be used for control current Multilevel Inverters and be in part collaborative control pattern its
The fundametal compoment of the respective output voltage of his Multilevel Inverters is more than or equal to 3 in respective output voltage and less than or equal to 2L-1's
Odd harmonics be 0 and parallel output total voltage in be more than or equal to 2L+1 and be less than or equal to default second threshold odd-times it is humorous
Wave is 0.
Optionally, when current Multilevel Inverters, other Multilevel Inverters are in parallel with one, and current more level unsteady flows
When device and other Multilevel Inverters are NPC three-level current transformer, the device further include:
First switch angle storage table obtains module, for solving the first Nonlinear System of Equations, determines under independent control mode
The corresponding switch angle vector of different voltages modulation ratio obtains the switching angle storage table under independent control mode；First is non-linear
Equation group are as follows:
Wherein, UdcFor the DC voltage of current Multilevel Inverters；M is voltage modulated ratio,Become for current more level
Flow device and other Multilevel Inverters jointly corresponding NPC three-level current transformer SHEPWM control output single-phase voltage four/
The vector of N number of perfect switch angle composition in one primitive period,
Second switch angle storage table obtains module, for solving the second Nonlinear System of Equations, determines complete Collaborative Control mould
The corresponding switch angle vector of different voltages modulation ratio, obtains the switching angle storage table under complete collaborative control pattern under formula；The
Two Nonlinear System of Equations are as follows:
Wherein,Output single-phase voltage is controlled for the corresponding NPC three-level current transformer SHEPWM of current Multilevel Inverters
The a quarter primitive period in N number of perfect switch angle composition vector, It is more for other
It is N number of in a quarter primitive period of the corresponding NPC three-level current transformer SHEPWM control output single-phase voltage of level current transformer
The vector of perfect switch angle composition,L≤N。
In the present embodiment, the embodiment of the present invention is more preparatory than inquiring according to voltage modulated by switch angle acquisition module 200
Switching angle storage table under the complete collaborative control pattern of storage, obtains voltage modulated than corresponding switch angle, using preparatory
Store opening for the corresponding switch angle vector of different voltages modulation ratio of each Multilevel Inverters under complete collaborative control pattern
Angle storage table is closed, SHEPWM Collaborative Control is carried out to multiple Multilevel Inverters in parallel, makes the external output voltage of parallel system
Overtone order it is higher, to reduce the total current THD of parallel system, optimize the harmonic performance of parallel system, improve
User experience.
In addition, have computer program thereon present invention also provides a kind of computer readable storage medium, the computer
Program is performed the SHEPWM control method that Multilevel Inverters multiple module paralleling provided by above-described embodiment may be implemented
The step of.The storage medium may include: USB flash disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random
Access various Jie that can store program code such as memory (Random Access Memory, RAM), magnetic or disk
Matter.
Each embodiment is described in a progressive manner in specification, the highlights of each of the examples are with other realities
The difference of example is applied, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment and
For computer readable storage medium, since it is corresponded to the methods disclosed in the examples, so be described relatively simple, it is related
Place is referring to method part illustration.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
Above to SHEPWM control method, device and the calculating of Multilevel Inverters multiple module paralleling provided by the present invention
Machine readable storage medium storing program for executing is described in detail.Specific case used herein carries out the principle of the present invention and embodiment
It illustrates, the above description of the embodiment is only used to help understand the method for the present invention and its core ideas.It should be pointed out that for
For those skilled in the art, without departing from the principle of the present invention, if can also be carried out to the present invention
Dry improvement and modification, these improvements and modifications also fall within the scope of protection of the claims of the present invention.
Claims (9)
1. a kind of SHEPWM control method of Multilevel Inverters multiple module paralleling characterized by comprising
Calculate the voltage modulated ratio for obtaining current Multilevel Inverters and phase angle；Wherein, the current Multilevel Inverters are
Any Multilevel Inverters；
According to the voltage modulated than the switching angle storage table inquired under pre-stored complete collaborative control pattern, described in acquisition
Voltage modulated is than corresponding switch angle；Wherein, the complete collaborative control pattern is for controlling current more level unsteady flows
The fundametal compoment of the respective output voltage of device and other described Multilevel Inverters in parallel with the current Multilevel Inverters, respectively
Being more than or equal to 3 from output voltage and being less than or equal to the odd harmonics of 2L-1 is to be more than or equal in 0 and parallel output total voltage
2L+1 and the odd harmonics for being less than or equal to preset first threshold value are 0, L for the positive integer more than or equal to 2 and less than or equal to N, and N is
Current Multilevel Inverters SHEPWM (the Selective Harmonic Elimination Pulse Width
Modulation, selective harmonic elimination pulsewidth modulation) control output single-phase voltage a quarter primitive period in ideal open
Close angle quantity；
According to the switch angle and the phase angle, generates pulse signal and drive the current Multilevel Inverters.
2. the SHEPWM control method of Multilevel Inverters multiple module paralleling according to claim 1, which is characterized in that institute
It states according to the voltage modulated than the switching angle storage table inquired under pre-stored complete collaborative control pattern, obtains the electricity
Before the corresponding switch angle of pressure modulation ratio, further includes:
Whether the control model for judging the current Multilevel Inverters is independent control mode；Wherein, the control model packet
Include the independent control mode and the complete collaborative control pattern；
If so, according to the switching angle storage table under the voltage modulated independent control mode more pre-stored than inquiry,
The voltage modulated is obtained than corresponding switch angle；Wherein, the independent control mode is for controlling current more level
The odd harmonics more than or equal to 3 in the fundametal compoment and output voltage of the output voltage of current transformer are 0；
If it is not, then executing the switching angle under the complete collaborative control pattern more pre-stored than inquiry according to the voltage modulated
Storage table obtains the step of voltage modulated is than corresponding switch angle.
3. the SHEPWM control method of Multilevel Inverters multiple module paralleling according to claim 2, which is characterized in that hold
Switching angle storage table under the row complete collaborative control pattern more pre-stored than inquiry according to the voltage modulated, obtains institute
Before stating the step of voltage modulated is than corresponding switch angle, further includes:
Whether the control model for judging the current Multilevel Inverters is complete collaborative control pattern；Wherein, the control mould
Formula further includes part collaborative control pattern；
If so, executing the switching angle under the complete collaborative control pattern more pre-stored than inquiry according to the voltage modulated
Storage table obtains the step of voltage modulated is than corresponding switch angle；
If it is not, then according to the voltage modulated than inquiring the pre-stored current Multilevel Inverters and being in the part
The corresponding switching angle storage table of other described Multilevel Inverters of collaborative control pattern, obtains the voltage modulated than corresponding
Switch angle；Wherein, the part collaborative control pattern for control the current Multilevel Inverters and in the portion
The fundametal compoment of the respective output voltage of other described Multilevel Inverters of point collaborative control pattern is greater than in respective output voltage
Odd harmonics equal to 3 and less than or equal to 2L-1 are to be more than or equal to 2L+1 in 0 and parallel output total voltage and be less than or equal to pre-
If the odd harmonics of second threshold are 0.
4. the SHEPWM control method of Multilevel Inverters multiple module paralleling according to claim 2, which is characterized in that when
Other Multilevel Inverters are in parallel with one for the current Multilevel Inverters, and the current Multilevel Inverters and its
When his Multilevel Inverters are NPC three-level current transformer, switching angle storage table under the independent control mode is obtained
Take process, comprising:
Solve the first Nonlinear System of Equations, determine under the independent control mode the corresponding switch angle of different voltages modulation ratio to
Amount；First Nonlinear System of Equations are as follows:
Wherein, UdcFor the DC voltage of the current Multilevel Inverters；M is the voltage modulated ratio,It is described current more
Corresponding NPC three-level current transformer SHEPWM control output single-phase is electric jointly for level current transformer and other described Multilevel Inverters
The vector of N number of perfect switch angle composition in a quarter primitive period of pressure,
The acquisition process of switching angle storage table under the complete collaborative control pattern, comprising:
The second Nonlinear System of Equations is solved, determines the corresponding switching angle of different voltages modulation ratio under the complete collaborative control pattern
Spend vector；Second Nonlinear System of Equations are as follows:
Wherein,Output single-phase voltage is controlled for the corresponding NPC three-level current transformer SHEPWM of the current Multilevel Inverters
The a quarter primitive period in N number of perfect switch angle composition vector,For other institute
In a quarter primitive period for stating the corresponding NPC three-level current transformer SHEPWM control output single-phase voltage of Multilevel Inverters
The vector of N number of perfect switch angle composition,L≤N。
5. a kind of SHEPWM control device of Multilevel Inverters multiple module paralleling characterized by comprising
Computing module, for calculating the voltage modulated ratio and the phase angle that obtain current Multilevel Inverters；Wherein, described current more
Level current transformer is any Multilevel Inverters；
It switchs angle and obtains module, for according under the voltage modulated complete collaborative control pattern more pre-stored than inquiry
Switching angle storage table obtains the voltage modulated than corresponding switch angle；Wherein, the complete collaborative control pattern is for controlling
Make the current Multilevel Inverters and other described Multilevel Inverters in parallel with the current Multilevel Inverters respectively
The fundametal compoment of output voltage, be more than or equal in respective output voltage 3 and the odd harmonics less than or equal to 2L-1 be 0, and simultaneously
Being more than or equal to 2L+1 in connection output total voltage and being less than or equal to the odd harmonics of preset first threshold value is 0, L for more than or equal to 2
And it is less than or equal to the positive integer of N, N is a quarter base that the current Multilevel Inverters SHEPWM controls output single-phase voltage
Perfect switch angle quantity in wave period；
Drive module, for generating pulse signal driving current more level according to the switch angle and the phase angle
Current transformer.
6. the SHEPWM control device of Multilevel Inverters multiple module paralleling according to claim 5, which is characterized in that institute
It states switch angle and obtains module, comprising:
Judging submodule, for judging whether the control model of the current Multilevel Inverters is independent control mode；If so,
Then enabling signal is sent to the first acquisition submodule；If it is not, then sending enabling signal to the second acquisition submodule；Wherein, described
Control model includes the independent control mode and the complete collaborative control pattern；
First acquisition submodule, for according under the voltage modulated independent control mode more pre-stored than inquiry
Switching angle storage table, obtain the voltage modulated than corresponding switch angle；Wherein, the independent control mode is for controlling
In the fundametal compoment and output voltage of the output voltage of the current Multilevel Inverters is more than or equal to 3 odd harmonics
0；
Second acquisition submodule, for according to the voltage modulated complete Collaborative Control mould more pre-stored than inquiry
Switching angle storage table under formula obtains the voltage modulated than corresponding switch angle.
7. the SHEPWM control device of Multilevel Inverters multiple module paralleling according to claim 6, which is characterized in that institute
State the second acquisition submodule, comprising:
Judging unit, for judging whether the control model of the current Multilevel Inverters is complete collaborative control pattern；If
It is then to send enabling signal to first acquisition unit；If it is not, then sending enabling signal to second acquisition unit；Wherein, the control
Molding formula further includes part collaborative control pattern；
The first acquisition unit, for according to the voltage modulated complete collaborative control pattern more pre-stored than inquiry
Under switching angle storage table, obtain the step of voltage modulated is than corresponding switch angle；
The second acquisition unit, for according to the voltage modulated current Multilevel Inverters more pre-stored than inquiry
Switching angle storage table corresponding with other described Multilevel Inverters in the part collaborative control pattern, obtains the electricity
Press the corresponding switch angle of modulation ratio；Wherein, the part collaborative control pattern is for controlling the current Multilevel Inverters
With the fundametal compoment with the respective output voltage of other described Multilevel Inverters in the part collaborative control pattern, respectively
Being more than or equal to 3 in output voltage and being less than or equal to the odd harmonics of 2L-1 is to be more than or equal to 2L in 0 and parallel output total voltage
+ 1 and the odd harmonics that are less than or equal to default second threshold be 0.
8. the SHEPWM control device of Multilevel Inverters multiple module paralleling according to claim 6, which is characterized in that when
Other Multilevel Inverters are in parallel with one for the current Multilevel Inverters, and the current Multilevel Inverters and its
When his Multilevel Inverters are NPC three-level current transformer, further includes:
First switch angle storage table obtains module, for solving the first Nonlinear System of Equations, determines under the independent control mode
The corresponding switch angle vector of different voltages modulation ratio, obtains the switching angle storage table under the independent control mode；Described
One Nonlinear System of Equations are as follows:
Wherein, UdcFor the DC voltage of the current Multilevel Inverters；M is the voltage modulated ratio,It is described current more
Corresponding NPC three-level current transformer SHEPWM control output single-phase is electric jointly for level current transformer and other described Multilevel Inverters
The vector of N number of perfect switch angle composition in a quarter primitive period of pressure,
Second switch angle storage table obtains module, for solving the second Nonlinear System of Equations, determines the complete Collaborative Control mould
The corresponding switch angle vector of different voltages modulation ratio under formula obtains the switching angle storage under the complete collaborative control pattern
Table；Second Nonlinear System of Equations are as follows:
Wherein,Output single-phase voltage is controlled for the corresponding NPC three-level current transformer SHEPWM of the current Multilevel Inverters
The vector of N number of perfect switch angle composition in a quarter primitive period,For described in other
N in a quarter primitive period of the corresponding NPC three-level current transformer SHEPWM control output single-phase voltage of Multilevel Inverters
The vector of a perfect switch angle composition,L≤N。
9. a kind of computer readable storage medium, which is characterized in that be stored with computer on the computer readable storage medium
Program is realized when the computer program is executed by processor as the described in any item Multilevel Inverters of Claims 1-4 are more
The step of SHEPWM control method of wired in parallel.
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