CN103532408B - Middle pressure CS-APF double hysteresis fault tolerant control method based on voltage vector method - Google Patents
Middle pressure CS-APF double hysteresis fault tolerant control method based on voltage vector method Download PDFInfo
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Abstract
The present invention relates to a kind of middle pressure CS APF(tandem type Shunt based on voltage space vector pwm theory) double hysteresis error-tolerance type current control method, solve the bigger problem of cascade circuit probability of failure present in CS APF, and effectively reduce cost.Under non-faulting state, mainly consider the rapidity of current tracking when current track error is bigger, when error is less, mainly consider accuracy；Under malfunction, make full use of cascaded inverter redundancy voltage vector many, and the characteristic that position often overlaps, select the replacement false voltage vector of optimum non-faulting voltage vector equivalence as far as possible, accurate track reference value under making the output electric current of CS APF to nonserviceable.Compared with the most conventional N+1 redundancy fault-tolerant mode, this method need not increase additional hardware redundancy resource, cost-effective, it is possible to extend to, in arbitrary order CS APF, be pressed with the functional reliability of active power filter in significantly improving.
Description
Technical field
The present invention relates to Active Power Filter-APF technical field, particularly relate to a kind of middle pressure based on voltage space vector pwm theory
CS-APF double hysteresis error-tolerance type current control method.
Background technology
At present, the filter of China's intermediate voltage electric power system is mainly based on passive filtering, including passive power filter
FC, thyristor switchable capacitor TSC and thyristor-controlled reactor TCR etc..There is parameter fix, compensate dumb, can only filter
Except specific subharmonic, easily produce the shortcomings such as resonance.Therefore, the regulating effect of harmonic wave is the best, and power supply quality need further
Improve.
Active Power Filter-APF (be called for short APF) has controllability and the rapidity of response of height, be administer harmonic pollution,
Improve a kind of more satisfactory filter of the quality of power supply.Present stage, APF technology has obtained in low-pressure field such as 400V distributions
Arrive successful Application；But by hardware limitation, the capacity of separate unit APF device is typically small, it is impossible to directly apply to middle pressure Large Copacity
Occasion.
Owing to 10kV, 35kV medium voltage distribution network overwhelming majority of China belongs to isolated neutral system, the suitableeest
Close direct Introduced From Abroad active power filtering equipment.It is more suitable on the premise of taking into full account the special national conditions of China, independent research is pressed
Active Power Filter-APF.Such as, main circuit topological structure is suitable for using the bind mode of three-phase three-wire system.
CS-APF has that capacity is big, switching frequency is low, flexible structure, that replacing is convenient, du/dt is low, current ripples is little etc. is excellent
Point, is highly suitable to be applied for middle pressure Large Copacity field.But owing to the device in cascaded inverter main circuit is more, compared to tradition
The probability of failure of APF, CS-APF can be much larger.Owing to each cascade H-bridge unit is series connection, when any one concatenation unit occurs
During fault, if taking no action to, this trouble unit place will be made cannot to work on mutually, electrical network can be caused very favourable opposition
Hit.Therefore, the failure tolerant ability of CS-APF system pendulum the most naturally how is improved in face of us.
Present stage, driving field at high-tension motor, the faults-tolerant control of tandem type converter is the most of common occurrence；?
The research of STATCOM field cascaded inverter fault-toleranr technique there has also been substantially progress；Some enterprises are also carrying out CS-both at home and abroad
The research of APF Fault Tolerance Control Technology, as the most electric in the force of China etc..Compared with motor-driven, the three-phase output electric current of APF does not has
There is the requirement of Striking symmetry, especially under current hysteresis-band control mode, as long as three-phase current error is less than hysteresis band；With
STATCOM compares, and the devices switch frequency of APF is much higher.Therefore, before the Fault Tolerance Control Technology of CS-APF can not be indiscriminately imitated completely
Both theories, need to be designed in light of its own characteristics.
At present, the Fault Tolerance Control Technology of cascade type DC-to-AC converter mainly has following 3 kinds:
(1) unit that breaks down is shielded, and by non-faulting unit shielding corresponding with trouble unit in the most biphase,
To ensure the symmetry of three-phase output phase voltage, i.e. fall capacity runs.The method is relatively suitable for that motor is this kind of requires that three phase mains is complete
Holosymmetric load, but the fan-out capability of part non-faulting concatenation unit could not be fully used, and there is the waste of resource；
(2) method based on neutral point excursion can obtain the line of symmetry electricity of maximum in the case of only bypassing trouble unit
Pressure；But the method is used for the control system having modulating wave, is not suitable for voltage vector method；
(3) make full use of the redundant resource of system, replace on off state or the concatenation unit that cannot use because of fault；Superfluous
Remaining system redundancy, unit redundancy and the on off state redundancy 3 kinds of can being divided into:
1. system redundancy i.e. increase by one with the circuit structure of original system completely the same parallel redundancy structure, this method is not suitable for
Cascade structure, otherwise can cause the serious waste of resource；
2. unit redundancy is i.e. on the basis of original N unit is connected, and is further added by one or two stand-by unit mutually, conventional
Be N+1 redundancy；Once some concatenation unit breaks down, and bypasses this trouble unit immediately, redundancy unit is put into work simultaneously
Make, replace trouble unit；But, owing to APF device works in non-faulting state in most cases, therefore the method can be made
Become the waste of redundancy unit capacity；
3. on off state redundancy then need not additional firmware redundant resource, is to utilize location overlap or close Redundanter schalter
State (i.e. voltage vector) replaces breakdown switch state, thus realizes faults-tolerant control, the most economical material benefit of the method；The present invention relates to
Middle pressure CS-APF fault tolerant control method utilize Redundanter schalter state to realize faults-tolerant control exactly.
Through consulting domestic and foreign literature, not yet find " to utilize cascaded inverter Redundanter schalter state to realize in faults-tolerant control
Pressure CS-APF Fault Tolerance Control Technology " research.
Summary of the invention
(1) to solve the technical problem that
In order to press the problem that CS-APF probability of failure is bigger in solving, and reducing hardware cost as far as possible, the present invention carries
Having supplied to press in one CS-APF double hysteresis fault tolerant control method, the redundancy voltage vector making full use of cascaded inverter realizes fault-tolerant
Control, more accurate compensation harmonic electric current under making CS-APF to nonserviceable, thus improve the power supply of China's intermediate voltage electric power system
Quality.
(2) technical scheme
In order to achieve the above object, the present invention relates to method comprise the steps:
(1) determine that active filter output compensates the actual value i of electric current by electric current double hysteresiscWith reference value ic *Between
Error delta i, wherein the outer shroud of electric current double hysteresis ensures the rapidity of current tracking, and internal ring ensures accuracy, and as selecting electricity
The foundation of pressure vector；
(2) control method under non-faulting state:
1. | the △ i | that works as current track error is more than outer ring width h2Time (| △ i | >=h2), do not consider reference voltage space
Vector position, selects the voltage vector making current error decrease speed the fastest, i.e. the d △ i/dt of its correspondence has and current error
The largest component that vector △ i is in opposite direction, makes | △ i | approaches internal ring with the fastest speed, thus realize reference current fast
Speed is followed the tracks of；
2. (the h when current error is between internal ring and outer shroud2＞ | △ i | >=h1), select corresponding error current differential
The voltage vector that amplitude is minimum, with steady state error, and reduces switching frequency；
3. when error current is less than inner ring width h1Time (h1＞ | △ i | >=0), output voltage vector will remain unchanged as, with
Reduce average frequency of switching, simplify algorithm；
(3) when one or several concatenation unit of CS-APF breaks down, this phase level number can be caused to reduce, above-mentioned
The voltage vector that method is selected is likely to be due to fault and cannot use, and becomes false voltage vector；Now, short circuit event first rapidly
Barrier unit, and it is many to make full use of cascaded inverter redundancy voltage vector, and the characteristic that position often overlaps, select optimum non-event
Barrier voltage vector replaces false voltage vector, i.e. selects position to overlap or effect immediate non-faulting vector substitutes, make
The output electric current i of CS-APFcAccurate track reference value under nonserviceabling.
The voltage vector of optimum is selected so that the output electric current of CS-APF is in non-faulting state and fault according to above-mentioned steps
Under state can track reference value accurately, i.e. realize the effective compensation of harmonic wave.
It addition, for keeping the DC voltage of each concatenation unit to equalize, need DC side is carried out closed loop control.
Particularly, step (3), when some concatenation unit breaks down, can cause this phase level number to reduce.When former algorithm
The voltage vector U selectedkDuring for non-faulting voltage vector, then calculating and terminate, this vector is last selected voltage vector.If
UkFor fault vector, then select to function effect other non-faulting voltage vector immediate and substitute, prioritizing selection position
Put the non-faulting vector of coincidence, if the vector that all positions overlap is all fault vector, then select position and effect closest
Other vector replace Uk。
Concrete vector alternative steps is as follows:
In the voltage vector-diagram of N rank cascaded inverter, midpoint outwards have 2N regular hexagon (not including midpoint),
It is respectively designated as hexagon 1,2 ... 2N, in cascaded inverter a phase, has m(0 ＜ m ＜ N) as a example by individual concatenation unit breaks down:
Work as Uk=(x, y, when z) being positioned at outermost m hexagon in voltage vector-diagram, now without position overlap non-
Fault vector may select, and vector alternative method is as follows:
When reference voltage vector is positioned at sector I or VI, select (x-1, y, z), (x-2, y, z) ... in immediate with it
Non-faulting voltage vector；
When reference voltage vector is positioned at sector III or IV, select (x+1, y, z), (x+2, y, z) ... in closest with it
Non-faulting voltage vector；
When reference voltage vector is positioned at sector II or V, do not affected by a phase fault；
Exponent number N is the biggest in cascade, and phase place and Size Error before and after vector replacement are the lowest, and current tracking is the most accurate；
Work as UkDuring=(x, y z) are positioned at hexagon j(1≤j≤2N-m), the non-faulting vector now having position to overlap can
Selecting, vector alternative method is as follows:
When reference voltage vector is positioned at sector I or VI, select (x-1, y-1, z-1), (x-2, y-2, z-2) ... in non-
False voltage vector；
When reference voltage vector is positioned at sector III or IV, select (x+1, y+1, z+1), (x+2, y+2, z+2) ... in
Non-faulting voltage vector；
When reference voltage vector is positioned at sector II or V, do not affected (border is disregarded) by a phase fault；
In like manner can obtain, the voltage vector replacement method when b or c phase has a concatenation unit to break down.
(3) beneficial effect
Based on voltage vector method the middle pressure CS-APF double hysteresis fault tolerant control method that the present invention proposes, solves CS-APF
The problem that probability of failure is bigger, has taken into account rapidity and the accuracy of current tracking, has had stronger fault freedom, be especially suitable for
Middle pressure, powerful occasion.The method need not the hardware redundancy resource added, and hardware cost is low, can significantly improve middle pressure
The functional reliability of active filter, has the wide market space.
Accompanying drawing illustrates:
Fig. 1 is CS-APF topology diagram.
Fig. 2 is CS-APF concatenation unit topology mechanism map and equilibrium auxiliary clamp circuit.
Fig. 3 is middle pressure CS-APF double hysteresis fault tolerant control method schematic diagram based on voltage vector method.
Fig. 4 is 2 five corresponding for rank CS-APF level voltage vector scattergrams.
Fig. 5 is five-level switch magnetic state scattergram during a phase 1 cell failure.
Detailed description of the invention:
Below in conjunction with Figure of description, the present invention is described in detail.
(1) hardware circuit scheme
(1) main circuit topological structure
The middle pressure CS-APF main circuit topological structure that the present invention relates to is as shown in Figure 1: owing to APF requires to have the highest dynamic
Response speed and switching frequency, therefore switching device have selected IGBT, and rated voltage is 1700V.The exponent number N that is often in series needs root
Determining according to application scenario, as a example by 10KV distribution, retaining 2 times of margins of safety, the most each concatenation unit voltage 800-1000V is advisable,
The concatenation unit exponent number N being often in series is about about 10, in like manner can calculate the exponent number that other medium voltage network is corresponding.
(2) all pressures auxiliary circuit of concatenation unit DC voltage
The cascaded H-bridges unit topological diagram of the middle pressure CS-APF that the present invention relates to and all pressure auxiliary clamp circuit as in figure 2 it is shown,
The auxiliary circuit of each unit is connected with auxiliary circuit ac bus through isolating transformer by a full-bridge inverter, the most altogether
With an ac bus.Wherein Sac is auxiliary switch, and T is auxiliary transformer, auxiliary inversion bridge and main inverter bridge common DC
Bus, Udc is DC capacitor voltage.
(3) control circuit and drive circuit
Control circuit and the drive circuit of the middle pressure CS-APF that the present invention relates to are as follows: control circuit uses Two DSP structure,
Communicated by dual port RAM (IDT70V24s15), can be with data sharing.Wherein, DSP1 is responsible for detecting harmonic current as electricity
Stream reference value, and complete the control of DC side total voltage, and auxiliary circuit pwm signal produces；DSP2 is responsible for compensating current tracking
Control, produce PWM drive signal and the Bypass Control of trouble unit.IGBT drive circuit uses the IGBT of Beijing Luo Muyuan company
Integrate Design.
(2) software section scheme
Based on voltage vector method the middle pressure CS-APF double hysteresis fault tolerant control method that the present invention relates to is as shown in Figure 3: first
First computational load electric current iLIn harmonic components, negated and i.e. obtained reference current ic *；Optimum is selected by control algolithm
Voltage vector, makes APF output electric current in the case of fault and non-faulting, can be accurately tracked by ic *, thus realize harmonic wave and mend
Repay.
(1) in the case of CS-APF non-faulting, concrete control method is as follows:
As shown in the double hysteresis in Fig. 3, as | △ i | >=h2, current error is positioned at outer shroud, i.e. error is bigger.Now select
Select space vector of voltage UkIt is also contemplated that reduce error rapidity so that it is corresponding d △ i/dt has and current error vector △ i
Largest component in opposite direction；As a example by Fig. 4, now should select in the maximum voltage vector corresponding to hexagon summit, make
Current error reduces rapidly, thus realizes the quick tracking to reference current, makes error current approach internal ring with the fastest speed.
| △ the i | >=h as h2 ＞1Time, current error, between inner and outer rings, now should select corresponding error current micro-
The voltage vector that framing value is minimum, with steady state error, and reduces switching frequency, is limited near dead band by error current.By public affairs
FormulaVisible, work as Uk=u*Best suit requirement.
(1)
Work as h1＞ | △ i | is when >=0, and current error enters dead band, and now current error value disclosure satisfy that stable state accuracy
Requirement, output voltage vector will remain unchanged as, to reduce average frequency of switching, improve system stability.
As a example by 2 rank CS-APF, specific implementation method is as follows:
Fig. 4 is 25 corresponding for rank CS-APF level voltage vectograms, and reference voltage vector u* is positioned at sector I, error current
△ i is positioned at sector V；Now, △ i in three-phase currentbError is maximum, and bigger than normal.
As | △ i | >=h2Time, select the voltage vector in △ i vector opposite direction projection maximum, i.e. select voltage vector
(404), i is reduced with the fastest speedb, so that current error declines rapidly, now it is not intended that reference voltage vector u*
Physical location.
Work as h2＞ | △ i | >=h1Time, in 125 voltage vectors, first select 8 voltage vectors to be selected, if ua *、ub *、
uc *For reference voltage vector u*Component under three-phase a b c coordinate system, Ua *、Ub *、Uc *For three-phase reference voltage level value (0≤
Ua *、Ub *、Uc *≤ 4), both sides relation such as formula:
(2)
Then level vector is.Due to Ua *、Ub *、Uc *The most whole
Number, therefore, rounds to the level closed on up and down respectively, such as, works as Ua *When=1.5, round up and down as level 1 and 2.So U*Can go out
Existing 23=8 kinds of combinations.By formulaDiscretization:
(3)
It formula is system communication cycle.△ i to be made reduces, it is necessary to assure (u*-Uk) and △ i in opposite direction, i.e. inner product ＜
△in, (u*-Uk) ＞ less than 0, according to this condition, 8 vectors to be selected are carried out primary screening.Minimum former according to vector change
Then, optimum voltage vector will be as close possible to u*, i.e. UkMeet:
(4)
According to this condition, remaining vector to be selected is carried out primary screening, select optimal value.
Work as h1＞ | △ i | is when >=0, and the voltage vector keeping a upper sampling period is constant.When certain cascade module breaks down
Being shorted moment, non-faulting unit DC voltage is it may happen that change so that the reality of the voltage vector originally calculated
Value has occurred that deviation.Now, in the case of current error △ i is the least, precision rectification is carried out again the most unnecessary.
(2) in the case of CS-APF breaks down, CS-APF double hysteresis faults-tolerant control side based on voltage space vector pwm theory
Method is as follows:
When certain phase of N rank cascade circuit has m(0 ＜ m ＜ N) individual concatenation unit is when breaking down, affected by trouble unit,
This phase level number reduces 2m, and the voltage vector of some sector in voltage vector-diagram can reduce.When list each occurs in a, b, c phase
During unit's fault, on each sector vector to affect situation different.Concatenation unit fault is on the impact of each sector voltage vector such as
Shown in following table, √ represents that this sector is had an impact by fault, × indicate without impact, the most do not include that the voltage of sector intersection is vowed
Amount.
When a failure occurs, rapid closing auxiliary switch Sac is by malfunctioning module short circuit, then carries out faults-tolerant control.
First, optimal voltage vector U is selected by former control strategykIf, UkFor non-faulting voltage vector, then calculate and terminate；If
UkFor fault vector, then select to function effect other non-faulting voltage vector immediate and replace, preferred position weight
The non-faulting vector closed, if the vector that all positions overlap be all fault vector, now can only pass through position and effect and connect most
Other near vector replaces.
The concrete replacement method of fault vector is as follows:
In the voltage vector-diagram of N rank cascaded inverter, midpoint outwards have 2N regular hexagon (not including midpoint),
It is respectively designated as hexagon 1,2 ... 2N, has m(0 ＜ m ＜ N by a phase) as a example by individual concatenation unit breaks down.
As the optimal voltage vector U that former control strategy is selectedk=(x, y z) are positioned at outermost m six limits in vectogram
During shape, the non-faulting vector now overlapped without position may select.
When reference voltage vector is positioned at sector I or VI, select (x-1, y, z), (x-2, y, z) ... in immediate with it
Non-faulting voltage vector；When reference voltage vector is positioned at sector III or IV, select (x+1, y, z), (x+2, y, z) ... in its
Immediate non-faulting voltage vector；When reference voltage vector is positioned at sector II or V, do not affected by a phase fault.Cascade rank
N is the biggest for number, and phase place and Size Error before and after vector replacement are the lowest.
This method is equivalent to Ua *When rounding to the level closed on up and down, affected by a phase fault unit short circuit so that upper one
Level level does not exists, and therefore rounds with regard to two level of downward continuous print.Such as work as Ua *When=2.5, level 2 should be rounded up and down
With 3.If level 3 does not exists due to fault, Ua *Then rounding downwards continuously is 2 and 1.
As the optimal voltage vector U that former control strategy is selectedkDuring=(x, y z) are positioned at hexagon j(1≤j≤2N-m),
The non-faulting vector now having position to overlap may select.
When reference voltage vector is positioned at sector I or VI, select (x-1, y-1, z-1), (x-2, y-2, z-2) ... in non-
False voltage vector；When reference voltage vector is positioned at sector III or IV, select (x+1, y+1, z+1), (x+2, y+2, z+2) ...
In non-faulting voltage vector；When reference voltage vector is positioned at sector II or V, do not affected (border is disregarded) by a phase fault.
As a example by 2 rank CS-APF, specific implementation method is as follows:
When a phase has a concatenation unit to break down, voltage vector-diagram is as it is shown in figure 5, the vector table on dotted line in figure
Showing false voltage vector, the point on solid line represents non-faulting vector.Voltage vector when having Unit 1 to break down in a phase substitutes
Method see table.
In like manner can obtain, the voltage vector replacement method when b or c phase has a concatenation unit to break down.
(3) hysteresis band selects and switching loss
Generally hysteresis band approximates in inverse ratio with the switching frequency of device.Hysteresis band is the narrowest, and switching frequency is the highest, but this
Time compensate electric current tracking accuracy also can improve；On the contrary, hysteresis band is the widest, and switching frequency is the lowest, but tracking accuracy is the lowest.Fall
Low switching losses is not exclusively equal to reduce switching frequency, and the electric current and the soft switch technique that also flow through device with switching time have
Close.Visible, in the case of control population mean switching frequency is basically unchanged, according to the tune of the size reasonable of three-phase current norm
Whole hysteresis band, can effectively reduce main switch loss, concurrently facilitate DC side voltage of converter control.
APF requires that devices switch frequency is higher, and the loss of IGBT is based on switching losses.Assume in unit interval T every
Phase switch motion n time, in the case of ignoring on-state loss and off-state loss, every phase switching loss power is:
(5)
UdcFor DC side voltage of converter, it is assumed that size is constant.tonFor service time, i(k)For the switching current of kth time,
FormulaCan be reduced to:
(6)
Visible, switching loss and switching frequency, DC voltage, service time and switch average current iavRelevant.When three
When phase current norm is bigger, relaxes hysteresis band, thus reduce switching frequency；When three-phase current norm is less, appropriateness reduces
Displacement width, improves switching frequency, thus in the case of population mean switching frequency is basically unchanged, reduces main switch loss,
And then the Balance route for DC voltage lays the foundation.
(4) Pressure and Control of concatenation unit DC voltage
As in figure 2 it is shown, the PI regulation first passing through software program makes every mutually N number of unit DC voltage summation keep constant,
The most reasonably drive auxiliary circuit, realize the Power Exchange between each unit by ac bus, be finally reached electric voltage equalization, steady
Fixed.
It should be noted that the safety allowance of 2-3 times the most all can be retained during due to IGBT rated voltage type selecting, so working as
After in the cascaded inverter of N rank 1 or a few cells break down and be shorted, in residue unit, IGBT bears voltage
Not over permissible value.
(5) trouble unit bypass technology
When concatenation unit is short-circuited or during open circuit fault, as in figure 2 it is shown, first, block this unit PWM drive signal,
Switch Sac on the right side of Guan Bi this element, the unit short circuit that will break down, and opening of being connected with common bus on the left of switching units
Close Sac.Additionally, also to carry out corresponding faults-tolerant control in a failure code to host computer.
Claims (1)
1. medium pressure grade based on a voltage space vector pwm theory connection formula Shunt double hysteresis fault tolerant control method,
It is characterized in that, the step of described control method includes:
(1) determine that active filter output compensates the actual value vector i of electric current by electric current double hysteresiscWith reference value vector ic *It
Between current track error vector △ i, wherein the outer shroud of electric current double hysteresis ensures the rapidity of current tracking, and internal ring ensures accurately
Property, current track error Vector Mode | △ i | is using as the foundation selecting voltage vector；
(2) control method under non-faulting state:
When current track error Vector Mode, | △ i | is more than or equal to outer ring width h2Time, i.e. | △ i | >=h2, do not consider reference voltage
The d △ i/dt of the locus of vector, selects to make | △ i | the voltage vector that decrease speed is the fastest, i.e. its correspondence has and electric current
The largest component that tracking error vector △ i is in opposite direction, makes, and | △ i | approaches internal ring with the fastest speed, thus realizes reference
The quick tracking of electric current；
When | △ i | is when being between internal ring and outer shroud, i.e. h2＞ | △ i | >=h1, select corresponding error current differential amplitude minimum
Voltage vector, with steady state error, and reduce switching frequency；
When | △ i | is less than inner ring width h1Time, i.e. h1＞ | △ i | >=0, output voltage vector will remain unchanged as, average to reduce
Switching frequency, the selection that need not carry out again voltage vector in such cases calculates；
(3) when one or several concatenation unit of tandem type Shunt breaks down, this phase electricity can be caused
Flat number reduces；The voltage vector that cannot use due to this fault is referred to as false voltage vector, and is not affected by the impact of this fault
The voltage vector that can normally use is referred to as non-faulting voltage vector；Now, first short circuit trouble unit, select rational non-event
Barrier voltage vector replaces false voltage vector, i.e. selects the non-faulting vector that position overlaps or effect is close to substitute, makes CS-
The output electric current of APF can nonserviceable under track reference value accurately；
As the voltage vector U that step (2) is selectedkDuring for non-faulting voltage vector, then calculating and terminate, this vector is last selected
Voltage vector；If UkFor false voltage vector, then select other non-faulting voltage vector to substitute, first select position weight
The non-faulting vector closed, if the vector that all positions overlap is all false voltage vector, then selects position and effect close
Other vector replaces Uk, concrete vector alternative steps is as follows:
When cascaded inverter has N number of series unit, i.e. N rank cascaded inverter, the voltage vector-diagram of its correspondence is outside by midpoint
Total 2N regular hexagon, does not include midpoint, is respectively designated as hexagon 1,2 ... 2N, when having m level in cascaded inverter a phase
When receipts or other documents in duplicate unit breaks down, wherein 0 ＜ m ＜ N；
Work as Uk=(x, y, when z) being positioned in voltage vector-diagram around outermost m hexagon, now without overlap non-of position therefore
Barrier voltage vector may select, and vector alternative method is as follows:
When reference voltage vector is positioned at sector I or VI, first select voltage vector (x-1, y, z)；If voltage vector (x-1,
Y, is also z) false voltage vector, then select voltage vector (x-2, y, z)；By that analogy, non-faulting voltage vector is selected；
When reference voltage vector is positioned at sector III or IV, first select voltage vector (x+1, y, z)；If voltage vector (x+
1, y, be also z) false voltage vector, then select voltage vector (x+2, y, z)；By that analogy, non-faulting voltage vector is selected；
When reference voltage vector is positioned at sector II or V, do not affected by a phase fault；
Exponent number N is the biggest in cascade, and phase error and Size Error before and after vector replacement are the lowest, and current tracking is the most accurate；
Work as Uk=(x, y, when z) being positioned at around hexagon j, wherein 1≤j≤2N-m, now there is the non-faulting voltage that position overlaps
Vector may select, and vector alternative method is as follows:
When reference voltage vector is positioned at sector I or VI, first select voltage vector (x-1, y-1, z-1)；If voltage vector
(x-1, y-1, z-1) is also false voltage vector, then select voltage vector (x-2, y-2, z-2)；By that analogy, non-event is selected
Barrier voltage vector；
When reference voltage vector is positioned at sector III or IV, first select voltage vector (x+1, y+1, z+1)；If voltage vector
(x+1, y+1, z+1) is also false voltage vector, then select voltage vector (x+2, y+2, z+2)；By that analogy, non-event is selected
Barrier voltage vector；
When reference voltage vector is positioned at sector II or V region, do not affected by a phase fault；
Using same method operating procedure to obtain, the voltage vector when b or c phase has a concatenation unit to break down is replaced
Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310434169.3A CN103532408B (en) | 2013-09-23 | 2013-09-23 | Middle pressure CS-APF double hysteresis fault tolerant control method based on voltage vector method |
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| CN103973137A (en) * | 2014-04-04 | 2014-08-06 | 华南理工大学 | Improved space-vector-control three-phase PWM (pulse width modulation) rectifier system and control method thereof |
| CN111371301B (en) * | 2020-03-13 | 2021-11-02 | 中南大学 | IGBT junction temperature control method and system for two-level traction inverter |
| CN112671253B (en) * | 2021-03-15 | 2021-06-22 | 四川华泰电气股份有限公司 | Cascaded H-bridge converter, open-circuit fault redundancy processing method, medium, and apparatus |
| CN115347842B (en) * | 2022-10-12 | 2023-01-24 | 旋智电子科技（上海）有限公司 | Permanent magnet synchronous motor current control method based on constrained model predictive control |
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