CN104796024B - A kind of simplified multilevel space vector pulse duration modulation method and its soft core of modulation suitable for three-phase Cascade H bridge type converters - Google Patents
A kind of simplified multilevel space vector pulse duration modulation method and its soft core of modulation suitable for three-phase Cascade H bridge type converters Download PDFInfo
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- CN104796024B CN104796024B CN201510181313.6A CN201510181313A CN104796024B CN 104796024 B CN104796024 B CN 104796024B CN 201510181313 A CN201510181313 A CN 201510181313A CN 104796024 B CN104796024 B CN 104796024B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- 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
- H02M7/497—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 sinusoidal output voltages being obtained by combination of several voltages being out of phase
Abstract
The invention discloses a kind of simplified multilevel space vector pulse duration modulation method and its soft core of modulation suitable for three-phase Cascade H bridge type converters, in each switch periods TsStart time, each unit correspondence reference space voltage vector is obtained to reference space voltage vector sampling and then is judged with sector being completed to reference space voltage vector using shared computing resource respectively, correspondence reference space voltage vector is rotated to into 1 sector, obtain calculating gained switching time and be mapped to reference space voltage vector actual sector N, shunted and completed the corresponding pwm signal of a unit finally by multiple signals selection to each unit correspondence switching time and generate.The method can be used for the modulation for realizing three-phase Cascade H bridge type converters, and its technology is easy to each power cell balancing energy distribution, harmonic characterisitic is good, extensibility is strong, computation complexity is low, it is easy to which Digital Realization, dynamic, steady-state behaviour are good.Suitable for high-power governing system, HVDC transmission system, electric railway traction power supply system simplified multilevel space vector pulsewidth modulation.
Description
Technical field
The present invention relates to high-power governing system, HVDC transmission system, electric railway traction power supply system,
The design of high power static reacance generator and manufacture field.
Background technology
In recent years, multi-level converter is received significant attention in high-power occasion with its unique construction features.Mesh
Front common voltage-type multi-level converter is broadly divided into two big class of clamper type and unit cascaded type.The former is with level number
Increase, the quantity of required switching device sharply increases and be unfavorable for modularity, integrated and expanded so as in actual applications
By a definite limitation, and Cascade H bridge type multi-level converter (cascaded H-bridge multilevel converter,
CHMC) so that its modular construction is simple, autgmentability strong, control difficulty is little, the low advantage of harmonic content, obtain in every field
Extensively apply.Wherein, three-phase Cascade H bridge type converters gradually play the part of more and more important angle in each industrial application
Color, such as high-power governing system, HVDC transmission system, electric railway traction power supply system, high power static without
The fields such as work(generator.
Pulse modulation technique is as one of key technology for directly affecting multi-level converter output performance, main just to include
String pulsewidth modulation (sinusoidal pulse width modulation, SPWM), space vector pulse width modulation (space
Vector pulse width modulation, SVPWM), nearest Automatic level control (nearest level control, NLC)
Deng.At present, phase-shifting carrier wave sinusoidal pulse width modulation (carrier phase-shifted sinusoidal pulse width
Modulation, CPS-PWM) be easy to the distribution of each power cell balancing energy because of which, harmonic characterisitic is good, extensibility is strong, resource
Take less, be widely applied in CHMC.Compare SPWM, SVPWM has and is easy to Digital Realization, voltage utilization height etc.
Advantage, possesses wide application prospect, but the expanded application as traditional two level SVPWM on multi-level converter, due to
Cube relation is met between space vector of voltage quantity and output level number and do not possess CPS-PWM methods extensibility it is strong,
The advantages of resource occupation is few, traditional many level SVPWMs are suitable only for the relatively low occasion of output level number, it is difficult in three-phase Cascade H
Applying to extensive on bridge type converters.
With the continuous development of field programmable gate array (FPGA), its function is stronger and stronger, and application is also more and more wider
It is general.In this context, for the shortcoming for overcoming Two DSP structure to exist, gradually propose a kind of control based on DSP and FPGA
System structure processed, as shown in Fig. 2 this class formation is made up of a piece of floating-point operation DSP and a piece of FPGA, between the two by twoport
RAM carries out data exchange, and its feature is that the generation of PWM gate-control signals is completed using FPGA, not only beneficial to many level topology
Development, can produce more accurate PWM gate-control signals, while the control of the external equipments such as AD is put in FPGA performing, enter
One step alleviates the task of Floating-point DSP.But Floating-point DSP remains a need for the correlation computations for completing space vector modulation in the structure
Work.
As modulation algorithm complexity is continued to increase, to its performance requirement more and more higher, completed using special soft core
The control of SVPWM related works and associated external equipment, not only has that hardware circuit speed is fast, high reliability concurrently, together
When core controller (Floating-point DSP) is calculated from heavy repeatability in free so as to preferably run core control journey
Sequence.Simultaneously with the continuous development of EDA Technique (EDA) so that designer can rely on PLD
The carrier such as (FPGA, CPLD), special chip, completes the design of hardware circuit on eda software platform using hardware description language,
The efficiency and portability of circuit design are drastically increased, while hardware circuit scale is continued to increase so that product
Miniaturization progressively becomes a kind of development trend.
The content of the invention
It is an object of the invention to provide a kind of many level of simplification suitable for high power three-phase Cascade H bridge type converters
SVPWM methods, the advantages of possessing traditional multi-level SVPWM methods DC voltage utilization rate height, being easy to Digital Realization
Under the premise of, to overcome traditional multi-level SVPWM methods be not easy to the distribution of power cell balancing energy, extensibility it is not good,
The shortcomings of modulation computation complexity is higher, modulating system resources of chip takes larger.The method is applied to high power three-phase Cascade H
Bridge type converters, with good modulating performance and good stable state and dynamic property, and are easy to each power cell balancing energy
It is distributed, harmonic characterisitic is good, extensibility is strong, computation complexity is low, pressure utilization rate is high, be easy to Digital Realization.
To realize its goal of the invention, the technical scheme for being adopted is the present invention：
A kind of simplified multilevel space vector pulse duration modulation method suitable for three-phase Cascade H bridge type converters, three-phase level
Connection H bridge type converters topological structure is divided into three units, i.e. unit 1, unit 2 and unit 3 from top to bottom；In each switch periods
TsStart time, according to vector particular sample rule to reference space voltage vectorSampling obtains unit 1, unit 2 and unit
3 corresponding reference space voltage vectorsWithThen correspondence is referred to into space voltage respectively using shared computing resource
VectorWithSector judgement is completed, correspondence reference space voltage vector is rotated to into 1 sector, is obtained
WithComplete each unit reference space voltage vector region decision, vector time calculating, switching time calculating；Again will meter
Calculate gained switching time and be mapped to reference space voltage vector actual sector N, select to each list finally by multiple signals
Unit's correspondence switching time is shunted and is generated each unit correspondence PWM drive signal, so as to complete the change of three-phase Cascade H bridge type
The modulation of parallel operation；
The reference space voltage vector particular sample rule is：
In each switch periods TsStart time, to reference space voltage vectorSampling obtains the correspondence of unit 1 with reference to empty
Between voltage vectorThen with fixed sample time interval TcTo reference space voltage vectorSampling obtain subsequent cell 2,
3 corresponding reference space voltage vector of unitWithThen to unit 1, unit 2,3 corresponding reference space voltage vector of unit
Add flag bit and be transferred to shared computing resource and complete correlation computations；
The multiple signals system of selection is：
Judged according to calculated switching time respective flag position, to each unit correspondence switching time
Accurately judged and serial switch switching time is converted to into parallel signal, be respectively used to be given birth to according to pwm signal create-rule
Into the PWM drive signal needed for each unit.
Compared with prior art, the invention has the beneficial effects as follows：
First, the present invention provides a kind of stronger modulator approach of autgmentability for three-phase Cascade H bridge type converters.The method is led to
Cross and a unit of the bridge type converters of three-phase Cascade H shown in Fig. 1 is equivalent to into a three-phase tri-level changer, and then by three-phase
Cascade H bridge type converters are equivalent to some three-phase tri-level changers and are modulated respectively；By according to special rule to sky
Between reference voltage vector sampled, and complete correlation computations using shared computing resource.When three-phase Cascade H bridge type is converted
When the number of unit of device changes, it is only necessary to vector samples number of times, switch periods Ts, sampling interval TcIt is adjusted,
The design iterations of modulating system are effectively prevent, with stronger autgmentability.
2nd, the present invention provides for three-phase Cascade H bridge type converters that a kind of computation complexity is little, controller resource consumption is few
Modulator approach.Three-phase Cascade H bridge type converters are equivalent to some three-phase tri-level changers by the method, so as to by many level
SVPWM is reduced to three level SVPWMs；Meanwhile, using the geometrical symmetry of six sectors in three level voltage vector spaces, by three
Level SVPWM correlation computations are completed in 1 sector, further simplified algorithm complex, are reduced controller chip resource consumption.
It is a further object of the present invention to provide one kind realizes that above three-phase Cascade H bridge type converters simplify many level SVPWMs
The soft core of modulation of method.
The present invention is to realize that the technical scheme adopted by its goal of the invention is：
A kind of SVPWM of three-phase Cascade H bridge type converters for realizing method as defined above modulates soft core, two-port RAM with
Floating-point DSP, two-port RAM control module are connected；Two-port RAM control module and two-port RAM, vector samples module, sector
Judge module is connected；Sector judge module is connected with bridge arm switch time mapping block on two-port RAM control module, N sectors；
Region decision module is connected with bridge arm switch time computing module on Vector Rotation module, 1 sector；Vector samples module and both-end
Mouth RAM control modules, Vector Rotation module are connected；Vector Rotation module and vector samples module, vector time computing module phase
Even；Vector time computing module is connected with bridge arm switch time computing module on Vector Rotation module, 1 sector；Bridge arm on 1 sector
Switch time computing module is connected with bridge arm switch time mapping block on vector time computing module, N sectors；Bridge on N sectors
Arm switch time map module is connected with bridge arm switch time computing module, multiple signals selecting module on 1 sector；Multiple signals
Selecting module is connected with bridge arm switch time mapping block, 12 road pwm signal generation modules on N sectors.
The soft core of modulation of the SVPWM methods of three-phase Cascade H bridge type converters of the present invention uses hardware description language
VerilogHDL is developed, it is adaptable to FPGA, CPLD, ASIC, and its functional module includes two-port RAM, two-port RAM control
Module, vector samples module, sector judge module, Vector Rotation module, region decision module, vector time computing module, 1 fan
Bridge arm switch time mapping block, multiple signals selecting module, 12 road PWM on bridge arm switch time computing module in area, N sectors
Signal generation module, which is structurally characterized in that：Two-port RAM is connected with Floating-point DSP, two-port RAM control module；Two-port RAM
Control module is connected with two-port RAM, vector samples module, sector judge module；Sector judge module is controlled with two-port RAM
In module, N sectors, bridge arm switch time mapping block is connected；Region decision module is opened with bridge arm on Vector Rotation module, 1 sector
Close Time Calculation module to be connected；Vector samples module is connected with two-port RAM control module, Vector Rotation module；Vector Rotation
Module is connected with vector samples module, vector time computing module；Vector time computing module and Vector Rotation module, 1 sector
Upper bridge arm switch time computing module is connected；On 1 sector, bridge arm switch time computing module is fanned with vector time computing module, N
In area, bridge arm switch time mapping block is connected；Bridge arm switch time on bridge arm switch time mapping block and 1 sector on N sectors
Computing module, multiple signals selecting module are connected；Bridge arm switch time mapping block on multiple signals selecting module and N sectors,
12 road pwm signal generation modules are connected.
The working process and principle of the soft core are：Reference space voltage vector from Floating-point DSP is received by two-port RAMTwo-port RAM control module is by the reference space voltage vector stored in two-port RAMRead, vector samples module
To reference space voltage vectorCarry out sampling obtain unit as shown in Figure 11, unit 2 and unit 3 correspondence refer to space voltage
VectorWithVector time computing module exports reference space voltage vector according to region decision moduleInstitute
In region, (I～IV) determines reference space voltage vector synthetic schemes and solves fundamental space voltage vector action time, 1 sector
Upper bridge arm switch time computing module enters according to specific acting sequences according to corresponding reference space voltage vector synthetic schemes
Row distribution simultaneously calculates bridge arm switching time on 1 sector, and on N sectors, bridge arm switch time mapping block is connected according to specific
Bridge arm switching time on 1 sector is mapped to N sectors, multiple signals selecting module upper bridge arm corresponding to each unit by rule
Switching time is shunted and exported to 12 road pwm signal generation modules produces each unit correspondence pwm signal.
It can be seen that, using scheme of the present invention and the soft core of corresponding modulating can simply, it is reliable, stably accomplish three-phase cascade
The space vector pulse width modulation of H bridge type converters, and the design iterations of modulating system can be prevented effectively from.
With reference to the accompanying drawings and detailed description the soft core is described in further detail.
Description of the drawings
Fig. 1 is the three-phase Cascade H bridge type converters topological structure block diagram that the present invention is suitable for.
Fig. 2 is the topoligical equivalence graph of a relation that equivalent model of the present invention is set up.
Fig. 3 is that three-phase Cascade H bridge type converters simplify SVPWM schematic diagrams.
Fig. 4 is three-phase tri-level SVPWM 1 sector Vector modulation schematic diagrams of correspondence.
Fig. 5 is three-phase tri-level SVPWM simplified pinciple figures.
Fig. 6 is that three-phase Cascade H bridge type converters SVPWM modulates soft kernel function module.
Fig. 7 a are two unit cascaded H bridge type converters three-phase output voltage u of three-phaseA、uBAnd uCOscillogram.
Fig. 7 b are two unit cascaded H bridge type converters three-phase output current i of three-phaseA、iBAnd iCOscillogram.
Fig. 7 c are two unit cascaded H bridge type converters A phases of three-phase and alternate line voltages u of BABOscillogram.
Fig. 7 d are each H bridges output voltage u of two unit cascaded H bridge type converters A phases of three-phaseA1、uA2With A phase phase voltages uAWaveform
Figure.
Fig. 7 e are two unit cascaded H bridge type converters A phase output voltage u of three-phaseAWith electric current iAOscillogram.
Fig. 8 a are three unit cascaded H bridge type converters three-phase output voltage u of three-phaseA、uBAnd uCOscillogram.
Fig. 8 b are three unit cascaded H bridge type converters three-phase output current i of three-phaseA、iBAnd iCOscillogram.
Fig. 8 c are three unit cascaded H bridge type converters A phases of three-phase and alternate line voltages u of BABOscillogram.
Fig. 8 d are each H bridges output voltage u of three unit cascaded H bridge type converters A phases of three-phaseA1、uA2、uA3With A phase phase voltages uA
Oscillogram.
Fig. 8 e are three unit cascaded H bridge type converters A phase output voltage u of three-phaseAWith electric current iAOscillogram.
Waveform Main shown in Fig. 7, Fig. 8 is as follows：Pwm signal switching frequency fs=1000Hz；Fundamental frequency f0=
50Hz；Dead Time td=4 μ s；DC voltage E=100V；Load resistance RL=5 Ω；Load inductance L=5mH.
Specific embodiment
Fig. 1 illustrates, the three-phase Cascade H bridge type converters topological structure that the present invention is suitable for, Fig. 1 constituted with three units three
As a example by phase Cascade H bridge type converters, its topological structure is：The topology is divided into three units from top to bottom, each H bridge DC sides electricity
Press as E, phase voltage uA、uB、uCBe the potential difference of every phase output point and neutral point, and for this mutually each H bridge modules output voltage it
With.Phase current iA、iB、iCPositive direction is oriented to arrow in Fig. 3.It is with neutral point as reference ground, then electric per mutually exportable seven kinds
It is flat：-3E、-2E、-E、0、E、2E、3E.
Fig. 2 illustrates, the topoligical equivalence relation that equivalent model of the present invention is set up, and its concrete principle is：For single H bridge modules
It is analyzed, 4 switches for defining m-th unit of xth phase are respectively As shown in Fig. 2 (a), Fig. 2
The phase bridge arm of (b) for three-phase tri-level changer, by Fig. 2 (a) and circuit shown in Fig. 2 (b) in each on off state pair
Answer output voltage to carry out labor to understand, in two kinds of normal circuit operations, output voltage u is within the primitive period for correspondence
As shown in Fig. 2 (c).Therefore, for three-phase Cascade H bridge type converters, single H bridge modules can be equivalent to three-phase tri-level
One phase bridge arm of changer, so as to three units shown in Fig. 1 are equivalent to three three-phase tri-level changers.
Fig. 3 illustrates that three-phase Cascade H bridge type converters of the present invention simplify many level SVPWM principles, and its principle is：With
θcReference space voltage vector is sampled for angle interval, obtain reference space voltage of the m units positioned at N sectors and swear
Measure and beThen unit 1, unit 2,3 corresponding reference space voltage vector of unit are respectively obtained according to time order and function orderAs shown in figure 3, and then according to three level SVPWMs, utilizationCorrelation computations are completed, it is many so as to realize
Level SVPWM.
Fig. 4 illustrates that three-phase tri-level SVPWM 1 sector Vector modulation principles of correspondence, the principle are set forth in detail in 1 sector
The synthesis mode of reference space voltage vector, can determine when each unit 1 sector internal reference space voltage vector of correspondence with this
When in I～IV region, it is respectively adopted which fundamental space voltage vector is synthesized, and is set up according to voltage-second balance principle
Equation group, solved to the action time of fundamental space voltage vector.
Fig. 5 illustrates, three level SVPWM simplified pinciples, as a example by this sentences three level voltage vector spaces, 1 sector and 2 sectors,
The principle is described：As illustrated, reference space voltage vectorPositioned at 2 sectors, willTurn clockwise 60 ° i.e.
The constant amplitude reference space voltage vector of same position in available 1 sectorReturn in mathematical relationship, swear with reference to space voltage
AmountCan be by space voltage vector U2、U10And U3Synthesis, solves by setting up equation group according to voltage-second balance principle and obtains U2、
U10And U3Corresponding action time.In the same manner, equation group is multiplied by into exp (- j π/3) and can equally obtains reference space voltage vector
Corresponding equation group.Due to space voltage vector U1With U2, U8With U10, U2With U3Positioned at the same position of different sectors, therefore can lead to
Crossing, the reference space voltage vector equivalence positioned at different sectors is carried out the calculating of space voltage vector action time to 1 sector,
And result of calculation is mapped to after having calculated the actual sector of reference space voltage vector.
Fig. 6 illustrates that three-phase Cascade H bridge type converters SVPWM modulates soft kernel function module, and the soft core mainly includes dual-port
RAM, two-port RAM control module, vector samples module, sector judge module, Vector Rotation module, region decision module, arrow
Amount Time Calculation module, bridge arm switch time computing module on 1 sector, bridge arm switch time mapping block, multichannel letter on N sectors
Number selecting module, 12 road pwm signal generation modules, which is structurally characterized in that：Two-port RAM is controlled with Floating-point DSP, two-port RAM
Module is connected；Two-port RAM control module is connected with two-port RAM, vector samples module, sector judge module；Sector judges
Module is connected with bridge arm switch time mapping block on two-port RAM control module, N sectors；Region decision module is revolved with vector
On revolving die block, 1 sector, bridge arm switch time computing module is connected；Vector samples module is revolved with two-port RAM control module, vector
Revolving die block is connected；Vector Rotation module is connected with vector samples module, vector time computing module；Vector time computing module with
In Vector Rotation module, 1 sector, bridge arm switch time computing module is connected；Bridge arm switch time computing module and arrow on 1 sector
In amount Time Calculation module, N sectors, bridge arm switch time mapping block is connected；Bridge arm switch time mapping block and 1 on N sectors
On sector, bridge arm switch time computing module, multiple signals selecting module are connected；Multiple signals selecting module and bridge arm on N sectors
Switch time mapping block, 12 road pwm signal generation modules are connected.
Fig. 7 illustrates that two unit cascaded H bridge type converters of three-phase are in index of modulation miExperimental result when=0.84.Wherein,
Fig. 7 (a) and Fig. 7 (b) is respectively the three-phase output voltage u of two unit cascaded H bridge type converters of three-phaseA、uBAnd uCOscillogram and three
Phase output current iA、iBAnd iCOscillogram, it can be seen that voltage, current waveform have good hree-phase symmetry
(3PS), half-wave symmetry (HWS) and a quarter symmetry (QWS).Fig. 7 (c) is two unit cascaded H bridge type converters A of three-phase
Line voltage u alternate with BABOscillogram, uABFor 9 level, amplitude is 400V.Fig. 7 (d) is converted for two unit cascaded H bridge types of three-phase
The each H bridges output voltage u of device A phasesA1、uA2With A phase phase voltages uAOscillogram, uA5 level are output as, amplitude is 200V, by uA1With uA2
It is formed by stacking, uA1With uA23 level are output as, amplitude is 100V.Fig. 7 (e) is defeated for two unit cascaded H bridge type converters A phases of three-phase
Go out voltage uAWith electric current iAOscillogram, voltage uAAmplitude is 200V, electric current iAAmplitude is 40A.
Fig. 8 illustrates that three unit cascaded H bridge type converters of three-phase are in index of modulation miExperimental result when=0.84.Wherein,
Fig. 8 (a) and Fig. 8 (b) is respectively the three-phase output voltage u of three unit cascaded H bridge type converters of three-phaseA、uBAnd uCOscillogram and three
Phase output current iA、iBAnd iCOscillogram, it can be seen that voltage, current waveform have good hree-phase symmetry
(3PS), half-wave symmetry (HWS) and a quarter symmetry (QWS).Fig. 8 (c) is three unit cascaded H bridge type converters A of three-phase
Line voltage u alternate with BABOscillogram, uABFor 13 level, amplitude is 600V.Fig. 8 (d) becomes for three unit cascaded H bridge types of three-phase
The each H bridges output voltage u of parallel operation A phasesA1、uA2、uA3With A phase phase voltages uAOscillogram, uA7 level are output as, amplitude is 300V, by
uA1、uA2With uA3It is formed by stacking, uA1、uA2With uA33 level are output as, amplitude is 100V.Fig. 8 (e) is three unit cascaded H bridges of three-phase
Code converter A phase output voltage uAWith electric current iAOscillogram, voltage uAAmplitude is 300V, electric current iAAmplitude is 60A.
Without departing from the spirit and scope of the present invention, those skilled in the art are without departing from the scope of the present invention
In the case of spirit, a variety of obvious modification or change with regard to form and details carried out to which all should fall at this
Within bright protection domain.
Claims (2)
1. a kind of simplified multilevel space vector pulse duration modulation method suitable for three-phase Cascade H bridge type converters, three-phase Cascade H
Bridge type converters topological structure is divided into three units, i.e. unit 1, unit 2 and unit 3 from top to bottom；In each switch periods Ts
Start time, according to vector particular sample rule to reference space voltage vectorSampling obtains unit 1, unit 2 and unit 3
Correspondence reference space voltage vectorWithThen using shared computing resource respectively by correspondence with reference to space electricity
Pressure vectorWithSector judgement is completed, correspondence reference space voltage vector is rotated to into 1 sector, is obtainedWithComplete each unit reference space voltage vector region decision, vector time calculating, switching time meter
Calculate；Gained switching time will be calculated again and is mapped to reference space voltage vector actual sector N, select finally by multiple signals
Select and each unit correspondence PWM drive signal is shunted and generated to each unit correspondence switching time, so as to complete three-phase level
The modulation of connection H bridge type converters；
The reference space voltage vector particular sample rule is：
In each switch periods TsStart time, to reference space voltage vectorSampling obtains the correspondence of unit 1 with reference to space electricity
Pressure vectorThen with fixed sample time interval TcTo reference space voltage vectorSampling obtains subsequent cell 2, unit
3 corresponding reference space voltage vectorsWithThen unit 1, unit 2, the correspondence reference space voltage vector of unit 3 are added
Plus flag bit be transferred to shared computing resource and complete correlation computations；
The multiple signals system of selection is：
Judged according to calculated switching time respective flag position, each unit correspondence switching time is carried out
Accurately judge and serial switch switching time is converted to into parallel signal, be respectively used to be generated respectively according to pwm signal create-rule
PWM drive signal needed for unit.
2. a kind of SVPWM of three-phase Cascade H bridge type converters for realizing claim 1 methods described modulates soft core, and its feature exists
In two-port RAM is connected with Floating-point DSP, two-port RAM control module；Two-port RAM control module and two-port RAM, vector
Sampling module, sector judge module are connected；Sector judge module and bridge arm switch time on two-port RAM control module, N sectors
Mapping block is connected；Region decision module is connected with bridge arm switch time computing module on Vector Rotation module, 1 sector；Vector
Sampling module is connected with two-port RAM control module, Vector Rotation module；Vector Rotation module and vector samples module, vector
Time Calculation module is connected；Vector time computing module and bridge arm switch time computing module phase on Vector Rotation module, 1 sector
Even；Bridge arm switch time computing module and bridge arm switch time mapping block on vector time computing module, N sectors on 1 sector
It is connected；On N sectors, on bridge arm switch time mapping block and 1 sector, bridge arm switch time computing module, multiple signals select mould
Block is connected；Multiple signals selecting module is connected with bridge arm switch time mapping block, 12 road pwm signal generation modules on N sectors.
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| CN105099221A (en) * | 2015-08-07 | 2015-11-25 | 西南交通大学 | Simplified multilevel space vector pulse width modulation method for single-phase cascaded three-level bridge type converter of any number of level and modulation soft core thereof |
| CN105186898A (en) * | 2015-08-07 | 2015-12-23 | 西南交通大学 | Simplified multi-level space vector pulse width modulation method for any-level single-phase cascaded H-bridge type converter and modulation soft core thereof |
| CN105634314B (en) * | 2016-01-19 | 2018-09-21 | 西南交通大学 | Simplification multilevel space vector pulse duration modulation method suitable for single-phase more clamping types and cascade code converter |
| CN110661432B (en) | 2018-06-29 | 2021-08-06 | 台达电子企业管理（上海）有限公司 | Modulation method of cascade three-phase frequency converter |
| CN109951097B (en) * | 2019-03-22 | 2020-06-30 | 浙江大学 | MMC space vector modulation method based on submodule recombination and having fault tolerance |
| CN110071655B (en) * | 2019-05-21 | 2020-06-09 | 南昌工程学院 | Simplified multi-level converter space vector modulation method |
| CN112737385B (en) * | 2020-12-28 | 2022-02-01 | 合肥科威尔电源系统股份有限公司 | Model prediction-based multi-level converter vector modulation method and device |
| CN112865572B (en) * | 2021-01-29 | 2022-02-08 | 湖南工学院 | Cascade multilevel converter based on S-K and SVPWM |
| CN114257224B (en) * | 2022-03-01 | 2022-05-20 | 浙江飞旋科技有限公司 | Processing method and device for synchronous optimization pulse width modulation and electronic equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007274829A (en) * | 2006-03-31 | 2007-10-18 | Railway Technical Res Inst | System for controlling multiple inverter |
| CN101340156A (en) * | 2008-08-07 | 2009-01-07 | 株洲南车时代电气股份有限公司 | Modulating method and system of 3 level space vector |
| CN101826801A (en) * | 2010-04-08 | 2010-09-08 | 华中科技大学 | Space vector modulating method of three-phase matrix converter |
| CN102510252A (en) * | 2011-11-03 | 2012-06-20 | 沈阳工业大学 | Direct torque control system and method based on digital signal processing (DSP) and advanced reduced instruction set computer (RISC) machine (ARM) architecture |
-
2015
- 2015-04-17 CN CN201510181313.6A patent/CN104796024B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007274829A (en) * | 2006-03-31 | 2007-10-18 | Railway Technical Res Inst | System for controlling multiple inverter |
| CN101340156A (en) * | 2008-08-07 | 2009-01-07 | 株洲南车时代电气股份有限公司 | Modulating method and system of 3 level space vector |
| CN101826801A (en) * | 2010-04-08 | 2010-09-08 | 华中科技大学 | Space vector modulating method of three-phase matrix converter |
| CN102510252A (en) * | 2011-11-03 | 2012-06-20 | 沈阳工业大学 | Direct torque control system and method based on digital signal processing (DSP) and advanced reduced instruction set computer (RISC) machine (ARM) architecture |
Non-Patent Citations (1)
| Title |
|---|
| 一种新型级联多电平单相空间矢量调制研究;苏建明，等;《电力电子技术》;20130820;第47卷(第8期);第32-34页 * |
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