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CN103338000A - NPC (neutral point clamped) three-level inverter vector control system based on novel flux observer - Google Patents

NPC (neutral point clamped) three-level inverter vector control system based on novel flux observer Download PDF

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Publication number
CN103338000A
CN103338000A CN2013101645057A CN201310164505A CN103338000A CN 103338000 A CN103338000 A CN 103338000A CN 2013101645057 A CN2013101645057 A CN 2013101645057A CN 201310164505 A CN201310164505 A CN 201310164505A CN 103338000 A CN103338000 A CN 103338000A
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vector
voltage
rotor
npc
level
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Inventor
范波
谢冬冬
许惠
赵伟刚
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Henan University of Science and Technology
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Henan University of Science and Technology
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Abstract

An NPC (neutral point clamped) three-level inverter vector control system based on a novel flux observer provides a simplified SVPWM (space vector pulse width modulation) algorithm. A three-level space vector is decomposed into a two-level space vector; a reference voltage vector is translated; a two-level SVPWM algorithm is used to obtain action time of each basic vector and to choose a right switching status; and the three-level inverter vector control calculation is reduced. Meanwhile, in the invention, the novel flux observer is employed to calculate the rotor flux, so that a current model and a voltage model are used respectively at a low speed and at a high speed; and when a rotation speed is between the low speed and the high speed, an invented hybrid flux observer is used to calculate the rotor flux.

Description

NPC three-level inverter vector control system based on novel flux observer
Technical field
The invention belongs to high pressure, high power AC frequency control field, relate to the vector control of a kind of SVPWM shortcut calculation based on diode-clamped (NPC) three-level inverter, induction machine and novel mixing flux observer.
Background technology
NPC three-level inverter topological structure by years of development and research, has now obtained using widely in the powerful inversion occasion of mesohigh after putting forward.The characteristics of this type topological structure are that magnitude of voltage that each switching device bears is equivalent to half of original direct voltage, so just can utilize the high-speed switching devices (IGBT etc.) of low pressure grade to replace the low speed switch device (GTO etc.) of high pressure grade, its
Figure 156536DEST_PATH_IMAGE001
, common mode disturbances is smaller, reduced the peak voltage on electromagnetic interference and the motor winding widely.In AC speed regulating, can reduce the insulation property requirement of motor.
The SVPWM modulation algorithm is low because of its voltage utilization height, output waveform harmonic content, be easy to plurality of advantages such as Digital Realization, be widely used in the NPC tri-level inversion control system, but its calculating is loaded down with trivial details, and real-time is not high, influences the magnetic linkage estimated accuracy.In vector control system, the observation of rotor flux is a very important link in the induction Motor Vector governing system, its accuracy has direct influence to stability and the accuracy of system, and traditional flux observation exists direct current offset, causes certain amplitude and phase angle error.Therefore, in NPC three-level inverter vector control system, need simplify and to the improvement of flux observation the SVPWM algorithm, thereby guarantee the safe and stable operation of motor.
Summary of the invention
The present invention is for solving the problems of the technologies described above, based on NPC three-level inverter vector control system, a kind of SVPWM shortcut calculation has been proposed, by 3 level space vector being decomposed into two level space vectors, reference voltage vector is carried out translation, utilize two level SVPWM algorithms, draw the action time of each basic vector respectively and select suitable on off state, reduced three-level inverter calculation of vector control amount.Simultaneously, the present invention has adopted a kind of novel flux observer to calculate rotor flux, makes it adopt electric current and voltage model respectively when low speed and high speed, and when rotating speed is between the two, adopts the mixing flux observer of inventing to calculate rotor flux.
The present invention is that the technical scheme that the deficiency that solves the problems of the technologies described above adopts is: based on the NPC three-level inverter vector control system of novel flux observer,
A. set up the main circuit of NPC three-level inverter, each has mutually that 4 device for power switching are respectively, 4 fly-wheel diodes inverter
Figure RE-DEST_PATH_IMAGE002
, wherein
Figure 198310DEST_PATH_IMAGE003
, 2 clamping diodes; Two electric capacity
Figure RE-DEST_PATH_IMAGE004
,
Figure 978048DEST_PATH_IMAGE005
Be together in series in DC side, make
Figure RE-DEST_PATH_IMAGE006
=
Figure 497891DEST_PATH_IMAGE005
B. be main circuit with the NPC three-level inverter of setting up in the steps A, propose the shortcut calculation of a kind of SVPWM, select suitable on off state;
C. utilize based on rotor field-oriented principle of vector control, the SVPWM main circuit of being set up with steps A and step B serves as that suitable on off state is selected on the basis, utilize the flux observer of mixed model to calculate rotor flux, adopt the rotor flux of current model at low-speed stage, at the rotor flux of high speed stage employing voltage model, set up the vector control system based on the NPC three-level inverter.
The main circuit method for building up of NPC three-level inverter of the present invention is,
Each has three IGBT switching tubes, 4 fly-wheel diodes, 2 clamping diodes mutually the NPC three-level inverter; The whole three-phase inverter direct-flow side has two electric capacity
Figure 312263DEST_PATH_IMAGE004
,
Figure 134725DEST_PATH_IMAGE005
Be together in series and support and balanced dc voltage, =
Figure 725293DEST_PATH_IMAGE005
, the switching logic control by certain exchanges the phase voltage that side produces three kinds of voltages, and at the output synthesis sine, the dynamic mathematical models of its main circuit are:
Figure 394171DEST_PATH_IMAGE007
, wherein
Figure RE-DEST_PATH_IMAGE008
Be respectively
Figure 449852DEST_PATH_IMAGE009
The three-phase phase current,
Figure RE-DEST_PATH_IMAGE010
Be respectively the resistance value, the inductance value that exchange side,
Figure 204181DEST_PATH_IMAGE011
Be dc voltage,
Figure RE-DEST_PATH_IMAGE012
,
Figure 3510DEST_PATH_IMAGE013
Be respectively and exchange side A, B, C three-phase voltage source.
SVPWM shortcut calculation of the present invention is,
Step 1, for the NPC three-level inverter, each brachium pontis has only three kinds of output voltage values, namely just (p), zero (o), negative (n) are so three-phase output is total
Figure RE-DEST_PATH_IMAGE014
Individual voltage status combination corresponding to 27 groups of space vector different vector states, is decomposed three level space voltage vectors, and it is decomposed into the combination of the space voltage vector of a plurality of two level;
Step 2, work as reference voltage vector
Figure 589212DEST_PATH_IMAGE015
When dropping on 1 sector, this moment, reference voltage vector was arranged in two level space vector figure sectors 1 after the decomposition, according to nearest three vector synthesis of classics then, By basic voltage vectors
Figure RE-DEST_PATH_IMAGE016
,
Figure 322999DEST_PATH_IMAGE017
,
Figure RE-DEST_PATH_IMAGE018
Common synthetic, the principle according to the weber balance draws
Figure 660439DEST_PATH_IMAGE019
；
Step 3, three basic voltage vectors in the step 2 are handled, introduced a voltage translation vector
Figure RE-DEST_PATH_IMAGE020
, With
Figure 763711DEST_PATH_IMAGE016
In space vector, overlap, have
Figure 492632DEST_PATH_IMAGE021
, obtaining a reference voltage vector translation figure, two level space voltage vector figure after the translation are with voltage vector in the S=1 sector Be initial point, the SVPWM algorithm of three level is reduced to two level, and three basic voltage vectors after the translation have one to be always initial point;
Step 4, utilize two level SVPWM algorithms to calculate the action time of basic vector and select suitable on off state.
In the step 4 of the present invention, the vector control system method for building up is,
Step 1, adopt a kind ofly by rotor field-oriented vector control, the d axle is placed on the total flux linkage vector of rotor
Figure 633764DEST_PATH_IMAGE023
On, be called the M axle, the q axle be perpendicular to
Figure 131741DEST_PATH_IMAGE023
Reference axis on, be called the T axle, this moment rotor flux q axle component be 0 (
Figure RE-DEST_PATH_IMAGE024
), the voltage equation of induction machine can be expressed as
Figure 28022DEST_PATH_IMAGE025
, wherein
Figure RE-DEST_PATH_IMAGE026
,
Figure 978660DEST_PATH_IMAGE027
, , ,
Figure RE-DEST_PATH_IMAGE030
, ,
Figure RE-DEST_PATH_IMAGE032
, Be respectively stator voltage, stator magnetic linkage, stator current, rotor current under the MT coordinate system,
Figure RE-DEST_PATH_IMAGE034
,
Figure 2013101645057100002DEST_PATH_IMAGE035
Be respectively the resistance of the every phase of stator and rotor,
Figure RE-DEST_PATH_IMAGE036
Be synchronous angular velocity, p is differential operator, and the magnetic linkage equation can be expressed as:
Figure 2013101645057100002DEST_PATH_IMAGE037
, wherein ,
Figure 2013101645057100002DEST_PATH_IMAGE039
,
Figure RE-DEST_PATH_IMAGE040
Be respectively stator self-induction, rotor self-induction, rotor mutual inductance;
Step 2: adopt a kind of flux observer of mixed model, at the rotor flux of low-speed stage employing current model, adopt the rotor flux of voltage model at high speed stage.
The flux observation of voltage model of the present invention is
Figure 2013101645057100002DEST_PATH_IMAGE041
, wherein
Figure RE-DEST_PATH_IMAGE042
Be respectively voltage model rotor magnetic linkage
Figure 654733DEST_PATH_IMAGE043
Component; Be respectively stator voltage, stator current Component;
Figure RE-DEST_PATH_IMAGE046
Be stator resistance; Be magnetic leakage factor.
The flux observation of current model of the present invention is
Figure RE-DEST_PATH_IMAGE048
, wherein
Figure 2013101645057100002DEST_PATH_IMAGE049
Be respectively current model rotor magnetic linkage
Figure 279618DEST_PATH_IMAGE043
Component;
Figure RE-DEST_PATH_IMAGE050
Be induction electromotor rotor loop time constant;
Figure 762552DEST_PATH_IMAGE051
Rotating speed for induction machine.
Mixing flux observer of the present invention is
Figure RE-DEST_PATH_IMAGE052
, wherein
Figure 235122DEST_PATH_IMAGE053
Be respectively the coefficient of induction machine under different running statuses,
Figure RE-DEST_PATH_IMAGE054
Be respectively the mixed model rotor flux
Figure 410888DEST_PATH_IMAGE055
Component.
Beneficial effect of the present invention is: at the deficiency of SVPWM algorithm traditional in diode-clamped (NPC) the three-level inverter vector control system and rotor flux observation existence, propose a kind of three level and simplify the SVPWM vector control method, by decomposition and the translation to space voltage vector, be reduced to two level SVPWM algorithms and draw each basic vector action time respectively and the suitable on off state of selection, reduced the complexity of three level space voltage vector computings; The flux observer of inventing a kind of mixed model calculates rotor flux, according to motor operating state choose reasonable flux observation model.Based on the NPC three-level inverter vector control of this method, have that dynamic property is good, torque response is fast, advantages such as speed-regulating range width.
Description of drawings
Accompanying drawing 1 is the main circuit of NPC three-level inverter.
Accompanying drawing 2 is the vector control system structure chart based on the NPC three-level inverter.
Accompanying drawing 3 is the simplified model of three-level inverter.
Accompanying drawing 4 is NPC three level space voltage vector figure.
Accompanying drawing 5 is 6 two level space voltage vector figure after decomposing.
Accompanying drawing 6 is the voltage vector composite diagram.
Accompanying drawing 7 is voltage vector translation figure.
Embodiment
NPC three-level inverter vector control system based on the SVPWM shortcut calculation comprises following step:
The first step is set up the main circuit of NPC three-level inverter, and it is characterized in that: each needs 4 IGBT switching tubes, 4 fly-wheel diodes, 2 clamping diodes mutually inverter; The whole three-phase inverter direct-flow side is by two electric capacity
Figure 336119DEST_PATH_IMAGE004
,
Figure 560427DEST_PATH_IMAGE005
Be together in series and support and balanced dc voltage, Switching logic control by certain exchanges the phase voltage that side produces three kinds of voltages, at the output synthesis sine.The Mathematical Modeling of three-level inverter is order
Figure 684241DEST_PATH_IMAGE057
,
Figure RE-DEST_PATH_IMAGE058
,
Figure 54346DEST_PATH_IMAGE059
Switch function for inverter A, B, C three-phase then has, , inverter output phase voltage is expressed as with switch function
Figure 466873DEST_PATH_IMAGE061
, whole three-level inverter three-phase has 3 * 3 * 3=27 group output state, by three-level inverter main circuit simplified model as shown in Figure 3, can obtain the differential equation of three-phase circuit:
Figure RE-DEST_PATH_IMAGE062
, arrangement can get the Mathematical Modeling of three-level inverter main circuit:
Figure 557188DEST_PATH_IMAGE063
, wherein
Figure RE-DEST_PATH_IMAGE064
,
Figure 801088DEST_PATH_IMAGE065
,
Figure RE-DEST_PATH_IMAGE066
Be respectively A, B, C three-phase phase current, R, L are respectively resistance value, the inductance value that exchanges side,
Figure 53078DEST_PATH_IMAGE011
Be dc voltage,
Figure 15217DEST_PATH_IMAGE012
,
Figure 581328DEST_PATH_IMAGE067
,
Figure RE-DEST_PATH_IMAGE068
,
Figure 945313DEST_PATH_IMAGE069
Be the switch function of inverter A, B, C three-phase,
Figure RE-DEST_PATH_IMAGE070
, , Be respectively and exchange side A, B, C three-phase voltage source.
In second step, the shortcut calculation of SVPWM is characterized in that, embodiment is as follows:
A) for the NPC three-level inverter, each brachium pontis has only three kinds of output voltage values, and namely just (p), zero (o), negative (n) have so three-phase is exported
Figure DEST_PATH_370153DEST_PATH_IMAGE028
Individual voltage status combination is corresponding to 27 groups of space vector different vector states, as shown in Figure 4.The universal expression formula of space voltage vector is
Figure DEST_PATH_DEST_PATH_IMAGE138
Wherein
Figure DEST_PATH_301419DEST_PATH_IMAGE112
,
Figure DEST_PATH_10749DEST_PATH_IMAGE114
,
Figure DEST_PATH_961387DEST_PATH_IMAGE116
Be respectively the output state of A, B, C three-phase.Two traditional level SVPWM computational methods are simple relatively, if make three level space voltage vectors be decomposed into the combination of the space voltage vector of a plurality of two level, will reduce the amount of calculation of PWM.Three level space voltage vectors can be divided into stacked group of 6 two level space vector figure, as shown in Figure 5;
B) for a given reference voltage vector, when it falls within certain little delta-shaped region, this vertex of a triangle is exactly three basic voltage vectors of synthesized reference voltage vector, and the two level space vector figure that are arranged in sector S=1 with reference voltage vector are example, as shown in Figure 6.Work as reference voltage vector
Figure DEST_PATH_DEST_PATH_IMAGE140
When dropping on 1 sector, according to nearest three vector synthesis of classics then,
Figure DEST_PATH_155477DEST_PATH_IMAGE140
By basic voltage vectors
Figure DEST_PATH_445644DEST_PATH_IMAGE032
, ,
Figure DEST_PATH_763810DEST_PATH_IMAGE036
Common synthetic, wherein Corresponding to switching state output poo and onn,
Figure DEST_PATH_594680DEST_PATH_IMAGE034
Corresponding to pon,
Figure DEST_PATH_708129DEST_PATH_IMAGE036
Corresponding to pnn;
C) according to the principle of weber balance, draw
Figure DEST_PATH_72508DEST_PATH_IMAGE038
, wherein ,
Figure DEST_PATH_DEST_PATH_IMAGE144
Be the sampling period,
Figure DEST_PATH_DEST_PATH_IMAGE146
,
Figure DEST_PATH_DEST_PATH_IMAGE148
,
Figure DEST_PATH_DEST_PATH_IMAGE150
Be respectively basic voltage vectors
Figure DEST_PATH_109865DEST_PATH_IMAGE032
, ,
Figure DEST_PATH_891931DEST_PATH_IMAGE036
Action time.Introduce the voltage translation vector this moment
Figure DEST_PATH_242141DEST_PATH_IMAGE040
,
Figure DEST_PATH_270140DEST_PATH_IMAGE040
With
Figure DEST_PATH_389406DEST_PATH_IMAGE032
In space vector, overlap.Have
So just obtain a reference voltage vector translation figure, as shown in Figure 7.Abbreviation obtains
Figure DEST_PATH_DEST_PATH_IMAGE152
, wherein
Figure DEST_PATH_DEST_PATH_IMAGE154
,
Figure DEST_PATH_DEST_PATH_IMAGE156
,
Figure DEST_PATH_DEST_PATH_IMAGE158
,
Figure DEST_PATH_DEST_PATH_IMAGE160
Be respectively ,
Figure DEST_PATH_314787DEST_PATH_IMAGE032
,
Figure DEST_PATH_616456DEST_PATH_IMAGE034
,
Figure DEST_PATH_914713DEST_PATH_IMAGE036
Voltage vector after the translation.Two level space voltage vector figure after the translation are with voltage vector in the S=1 sector
Figure DEST_PATH_738050DEST_PATH_IMAGE156
Be initial point, just zero vector;
Figure DEST_PATH_107852DEST_PATH_IMAGE158
,
Figure DEST_PATH_936130DEST_PATH_IMAGE160
It is the basic vector after the two level space voltage vector translations.Table 1 has been listed the side-play amount of reference voltage vector when different sector.
Figure DEST_PATH_DEST_PATH_IMAGE162
In the table,
Figure RE-DEST_PATH_IMAGE090
,
Figure DEST_PATH_IMAGE091
Be respectively reference voltage vector
Figure 456706DEST_PATH_IMAGE055
Component under the coordinate,
Figure DEST_PATH_IMAGE093
,
Figure RE-DEST_PATH_IMAGE094
Be respectively
Figure 840283DEST_PATH_IMAGE090
,
Figure 594612DEST_PATH_IMAGE091
The translation component of voltage;
D) just the SVPWM algorithm of three level is reduced to two level algorithms like this, utilizes two level SVPWM algorithms to calculate action time and the suitable on off state of selection of basic vector afterwards.
The 3rd step is based on the method for building up of the vector control system of the NPC three-level inverter of novel flux observation.It is characterized in that embodiment is as follows:
A) in rotor field-oriented vector control system, generally the d axle is placed on the total flux linkage vector of rotor
Figure 331624DEST_PATH_IMAGE023
On, be called the M axle, the q axle be perpendicular to
Figure 917326DEST_PATH_IMAGE023
Reference axis on, be called the T axle.This moment rotor flux q axle component be 0 (
Figure DEST_PATH_IMAGE095
).When the two-phase synchronous rotating frame is pressed rotor flux linkage orientation,
Figure RE-DEST_PATH_IMAGE096
The voltage equation of induction machine can be expressed as
Figure 409487DEST_PATH_IMAGE025
, wherein ,
Figure DEST_PATH_IMAGE097
,
Figure RE-DEST_PATH_IMAGE098
,
Figure DEST_PATH_IMAGE099
,
Figure RE-DEST_PATH_IMAGE100
,
Figure DEST_PATH_IMAGE101
, , Be respectively stator voltage, stator magnetic linkage, stator current, rotor current under the MT coordinate system,
Figure 175504DEST_PATH_IMAGE034
,
Figure 881292DEST_PATH_IMAGE035
Be respectively the resistance of the every phase of stator and rotor,
Figure 216458DEST_PATH_IMAGE036
Be synchronous angular velocity, p is differential operator.The magnetic linkage equation can be expressed as:
Figure 7696DEST_PATH_IMAGE037
, wherein
Figure RE-DEST_PATH_IMAGE104
,
Figure DEST_PATH_IMAGE105
, Be respectively stator self-induction, rotor self-induction, rotor mutual inductance;
Adopt the rotor flux estimation effect of voltage model better during b) owing to fair speed, and when the low speed territory, adopt the rotor flux estimated accuracy of current model higher, therefore adopt a kind of flux observer of mixed model to make it adopt current model at low-speed stage, carry out the transition to voltage model at high speed stage reposefully by it.The voltage-type flux observer is
Figure DEST_PATH_IMAGE107
, wherein
Figure 211145DEST_PATH_IMAGE042
Be respectively voltage model rotor magnetic linkage
Figure 709122DEST_PATH_IMAGE043
Component; Be respectively stator voltage, stator current
Figure 493724DEST_PATH_IMAGE045
Component;
Figure 438547DEST_PATH_IMAGE046
Be stator resistance;
Figure 853347DEST_PATH_IMAGE047
Be magnetic leakage factor.The flux observer of this model, when the induction machine rotating speed when 10% rated speed is following because stator voltage diminishes, resistance drop influence increases, and computational accuracy is descended.The current mode flux observer is , wherein
Figure RE-DEST_PATH_IMAGE108
Be respectively current model rotor magnetic linkage
Figure 420781DEST_PATH_IMAGE043
Component;
Figure DEST_PATH_IMAGE109
Be induction electromotor rotor loop time constant.The flux observer of this model, when the induction machine bringing onto load moved, the load size changed, and the temperature rise of motor also changes along with the difference of load, and this just makes rotor time constant
Figure 841398DEST_PATH_IMAGE050
Value change on a large scale, reduce the precision of this magnetic linkage model;
C) foundation of the flux observer of mixed model.On control theory, the air gap flux observer can be regarded the linear system of one two input, single output as.The flux observer that so just can construct a mixed model is , wherein,
Figure RE-DEST_PATH_IMAGE110
Be respectively the rotor flux of mixed model Component.Therefore only need the choose reasonable coefficient
Figure DEST_PATH_IMAGE111
, the purpose that just can reach the amplitude-frequency characteristic of change realizes the steady switching of voltage model and current model, and current model played a major role when the basic principle of choosing was low speed, and voltage model is occupied an leading position during high speed.
For two concerning the motor of the utmost point, specific implementation is: when the rotating speed of induction machine The time, adopt the current mode flux observer; When rotating speed of motor greater than
Figure DEST_PATH_IMAGE113
The time, adopt the voltage-type flux observer; When the rotating speed of induction machine is positioned between the two, because the size of two models is more or less the same at this moment, therefore adopt the method for two model mix models, get
Figure RE-DEST_PATH_IMAGE114
,
Figure DEST_PATH_IMAGE115
, in the running of reality, said method can guarantee two smooth transitions between the model substantially.
So just set up the NPC three-level inverter vector control system based on novel flux observer, whole vector control system has response speed fast, good dynamic and static state performance, and be easy to Digital Implementation, have very strong practicality.

Claims (7)

1. based on the NPC three-level inverter vector control system of novel flux observer, it is characterized in that:
A. set up the main circuit of NPC three-level inverter, inverter each have 4 device for power switching to be respectively mutually
Figure 2013101645057100001DEST_PATH_IMAGE001
, 4 fly-wheel diodes
Figure 326107DEST_PATH_IMAGE002
, wherein
Figure DEST_PATH_IMAGE003
, 2 clamping diodes; Two electric capacity
Figure 993980DEST_PATH_IMAGE004
,
Figure DEST_PATH_IMAGE005
Be together in series in DC side, make
Figure 524450DEST_PATH_IMAGE004
=
Figure 44293DEST_PATH_IMAGE005
B. be main circuit with the NPC three-level inverter of setting up in the steps A, propose the shortcut calculation of a kind of SVPWM, select suitable on off state;
C. utilize based on rotor field-oriented principle of vector control, the SVPWM main circuit of being set up with steps A and step B serves as that suitable on off state is selected on the basis, utilize the flux observer of mixed model to calculate rotor flux, adopt the rotor flux of current model at low-speed stage, at the rotor flux of high speed stage employing voltage model, set up the vector control system based on the NPC three-level inverter.
2. the NPC three-level inverter vector control system based on novel flux observer as claimed in claim 1 is characterized in that: the main circuit method for building up of described NPC three-level inverter is,
Each has three IGBT switching tubes, 4 fly-wheel diodes, 2 clamping diodes mutually the NPC three-level inverter; The whole three-phase inverter direct-flow side has two electric capacity
Figure 484764DEST_PATH_IMAGE004
, Be together in series and support and balanced dc voltage,
Figure 324992DEST_PATH_IMAGE004
=
Figure 648526DEST_PATH_IMAGE005
, the switching logic control by certain exchanges the phase voltage that side produces three kinds of voltages, and at the output synthesis sine, the dynamic mathematical models of its main circuit are:
Figure 943503DEST_PATH_IMAGE006
, wherein Be respectively
Figure 687599DEST_PATH_IMAGE008
The three-phase phase current,
Figure DEST_PATH_IMAGE009
Be respectively the resistance value, the inductance value that exchange side,
Figure 628879DEST_PATH_IMAGE010
Be dc voltage,
Figure DEST_PATH_IMAGE011
,
Figure 668687DEST_PATH_IMAGE012
Be respectively and exchange side A, B, C three-phase voltage source.
3. the NPC three-level inverter vector control system based on novel flux observer as claimed in claim 1 is characterized in that: described SVPWM shortcut calculation is,
Step 1, for the NPC three-level inverter, each brachium pontis has only three kinds of output voltage values, namely just (p), zero (o), negative (n) are so three-phase output is total
Figure DEST_PATH_IMAGE013
Individual voltage status combination corresponding to 27 groups of space vector different vector states, is decomposed three level space voltage vectors, and it is decomposed into the combination of the space voltage vector of a plurality of two level;
Step 2, work as reference voltage vector
Figure 942804DEST_PATH_IMAGE014
When dropping on 1 sector, this moment, reference voltage vector was arranged in two level space vector figure sectors 1 after the decomposition, according to nearest three vector synthesis of classics then,
Figure 497282DEST_PATH_IMAGE014
By basic voltage vectors
Figure DEST_PATH_IMAGE015
,
Figure 489640DEST_PATH_IMAGE016
,
Figure DEST_PATH_IMAGE017
Common synthetic, the principle according to the weber balance draws
Figure 515496DEST_PATH_IMAGE018
；
Step 3, three basic voltage vectors in the step 2 are handled, introduced a voltage translation vector
Figure DEST_PATH_IMAGE019
,
Figure 847383DEST_PATH_IMAGE019
With
Figure 307183DEST_PATH_IMAGE015
In space vector, overlap, have
Figure 662203DEST_PATH_IMAGE020
, obtaining a reference voltage vector translation figure, two level space voltage vector figure after the translation are with voltage vector in the S=1 sector
Figure DEST_PATH_IMAGE021
Be initial point, the SVPWM algorithm of three level is reduced to two level, and three basic voltage vectors after the translation have one to be always initial point;
Step 4, utilize two level SVPWM algorithms to calculate the action time of basic vector and select suitable on off state.
4. as the NPC three-level inverter vector control system of claim 1 based on novel flux observer, it is characterized in that: in the described step 4, the vector control system method for building up is,
Step 1, adopt a kind ofly by rotor field-oriented vector control, the d axle is placed on the total flux linkage vector of rotor
Figure 491750DEST_PATH_IMAGE022
On, be called the M axle, the q axle be perpendicular to
Figure 114361DEST_PATH_IMAGE022
Reference axis on, be called the T axle, this moment rotor flux q axle component be 0 (
Figure DEST_PATH_IMAGE023
), the voltage equation of induction machine can be expressed as , wherein
Figure DEST_PATH_IMAGE025
,
Figure 38246DEST_PATH_IMAGE026
,
Figure DEST_PATH_IMAGE027
,
Figure 733800DEST_PATH_IMAGE028
,
Figure DEST_PATH_IMAGE029
,
Figure 837017DEST_PATH_IMAGE030
, ,
Figure 94079DEST_PATH_IMAGE032
Be respectively stator voltage, stator magnetic linkage, stator current, rotor current under the MT coordinate system,
Figure DEST_PATH_IMAGE033
,
Figure 282746DEST_PATH_IMAGE034
Be respectively the resistance of the every phase of stator and rotor,
Figure DEST_PATH_IMAGE035
Be synchronous angular velocity, p is differential operator, and the magnetic linkage equation can be expressed as:
Figure 442377DEST_PATH_IMAGE036
, wherein
Figure DEST_PATH_IMAGE037
, ,
Figure DEST_PATH_IMAGE039
Be respectively stator self-induction, rotor self-induction, rotor mutual inductance;
Step 2: adopt a kind of flux observer of mixed model, at the rotor flux of low-speed stage employing current model, adopt the rotor flux of voltage model at high speed stage.
5. it is characterized in that as the NPC three-level inverter vector control system of claim 4 based on novel flux observer: the flux observation of described voltage model is , wherein
Figure DEST_PATH_IMAGE041
Be respectively voltage model rotor magnetic linkage
Figure 642042DEST_PATH_IMAGE042
Component; Be respectively stator voltage, stator current
Figure 180864DEST_PATH_IMAGE042
Component;
Figure 366995DEST_PATH_IMAGE044
Be stator resistance;
Figure DEST_PATH_IMAGE045
Be magnetic leakage factor.
6. it is characterized in that as the NPC three-level inverter vector control system of claim 4 based on novel flux observer: the flux observation of described current model is
Figure 339761DEST_PATH_IMAGE046
, wherein
Figure DEST_PATH_IMAGE047
Be respectively current model rotor magnetic linkage
Figure 503021DEST_PATH_IMAGE042
Component; Be induction electromotor rotor loop time constant;
Figure DEST_PATH_IMAGE049
Rotating speed for induction machine.
7. it is characterized in that as the NPC three-level inverter vector control system of claim 4 based on novel flux observer: described mixing flux observer is
Figure 525651DEST_PATH_IMAGE050
, wherein Be respectively the coefficient of induction machine under different running statuses,
Figure 290275DEST_PATH_IMAGE052
Be respectively the mixed model rotor flux
Figure DEST_PATH_IMAGE053
Component.
CN2013101645057A 2013-05-08 2013-05-08 NPC (neutral point clamped) three-level inverter vector control system based on novel flux observer Pending CN103338000A (en)

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