CN103532408A - Medium-voltage CS-APF (Cascaded Shunt Active Power Filter) dual-hysteresis fault-tolerant control method based on voltage vector method - Google Patents

Medium-voltage CS-APF (Cascaded Shunt Active Power Filter) dual-hysteresis fault-tolerant control method based on voltage vector method Download PDF

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CN103532408A
CN103532408A CN201310434169.3A CN201310434169A CN103532408A CN 103532408 A CN103532408 A CN 103532408A CN 201310434169 A CN201310434169 A CN 201310434169A CN 103532408 A CN103532408 A CN 103532408A
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CN103532408B (en
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李国华
汪玉凤
宋雪萍
高小朋
张立
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Liaoning Technical University
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Abstract

The invention relates to a medium-voltage CS-APF (Cascaded Shunt Active Power Filter) dual-hysteresis fault-tolerant control method based on a voltage space vector method, and aims to solve the problem of high failure probability of a cascaded circuit existing in a CS-APF and effectively reduce the cost. In a non-failure state, the rapidness of current tracking is mainly considered when a current tracking error is large, and accuracy is mainly considered when the error is small; in a failure state, an optimal non-failure voltage vector is selected to equivalently replace a failure voltage vector as far as possible by making full use of the characteristics of a great number of redundant voltage vectors of a cascaded inverter and frequent coincidence of positions, so that the output current of the CS-APF can be used for accurately tracking a reference value in the failure state. Compared with the conventional frequently-used N+1 redundant fault-tolerant way, the method has the advantages that additional hardware redundant resources do not need to be added, cost is reduced, and the working reliability of a medium-voltage active power filter is improved remarkably; the method can be popularized into a CS-APF of any order.

Description

The two stagnant ring fault tolerant control methods of middle pressure CS-APF based on voltage vector method
Technical field
The present invention relates to Active Power Filter-APF technical field, relate in particular to the two stagnant ring error-tolerance type current control methods of a kind of middle pressure CS-APF based on voltage space vector pwm theory.
Background technology
At present, the filter of China's intermediate voltage electric power system mainly be take passive filtering as main, comprises passive power filter FC, thyristor switchable capacitor TSC and thyristor-controlled reactor TCR etc.Have parameter fix, compensate dumb, can only the specific subharmonic of filtering, easily produce the shortcomings such as resonance.Therefore, the regulating effect of harmonic wave is not good, and power supply quality need further raising.
Active Power Filter-APF (being called for short APF) has the controllability of height and the rapidity of response, is a kind of more satisfactory filter of administering harmonic pollution, improving the quality of power supply.Present stage, APF technology has obtained successful Application in low-pressure field such as 400V distributions; But be subject to hardware constraints, the capacity of separate unit APF device is generally less, can not directly apply to the large capacity occasion of middle pressure.
Because 10kV, the 35kV medium voltage distribution network overwhelming majority of China belongs to isolated neutral system, be therefore not too applicable to direct Introduced From Abroad active power filtering equipment.Be more suitable for, taking into full account under the prerequisite of the special national conditions of China, in independent research, being pressed with active power filter.For example, main circuit topological structure is applicable to adopting the bind mode of three-phase three-wire system.
CS-APF has the advantages such as capacity is large, switching frequency is low, flexible structure, replacing is convenient, du/dt is low, current ripples is little, is applicable to being very much applied to the large capacity of middle pressure field.But because the device in cascaded inverter main circuit is more, than traditional APF, the probability of failure of CS-APF can be much larger.Because each Cascade H bridge unit is for series connection, when any one cascade unit breaks down, if do not taken measures, will make this trouble unit place cannot work on mutually, can cause great impact to electrical network.Therefore the failure tolerant ability that, how to improve CS-APF system is just very naturally put in face of us.
Present stage, drives field at high-tension motor, and the fault-tolerant control of tandem type frequency converter is of common occurrence; Research in STATCOM field cascaded inverter fault-toleranr technique has also had obvious progress; Both at home and abroad some enterprises are also new electric etc. the force of research ，Ru China of carrying out CS-APF Fault Tolerance Control Technology.Compare with motor driven, the three-phase output current of APF does not have strict symmetrical requirement, and especially, under Hysteresis Current control mode, three-phase current error is only less than hysteresis band; Compare with STATCOM, it is high a lot of that the devices switch frequency of APF is wanted.Therefore, the Fault Tolerance Control Technology of CS-APF can not be indiscriminately imitated the above two theory completely, need to design in light of its own characteristics.
At present, the Fault Tolerance Control Technology of cascade type DC-to-AC converter mainly contains following 3 kinds:
(1) unit that shielding is broken down, and by non-trouble unit shielding corresponding with trouble unit in other two-phase, to guarantee the symmetry of three-phase output phase voltage, capacity operation falls.The method is relatively applicable to the load of this generic request three phase mains full symmetric of motor, but the fan-out capability of the non-failure level receipts or other documents in duplicate of part unit could not be fully used, there is the waste of resource;
(2) method based on neutral point excursion can obtain maximum line of symmetry voltage in the situation that of bypass trouble unit only; But the method is used for the control system of modulating wave, be not suitable for voltage vector method;
(3) make full use of the redundant resource of system, replace on off state or the cascade unit that because of fault, cannot use; Redundancy can be divided into 3 kinds of system redundancy, unit redundancy and on off state redundancies:
1. system redundancy increases a circuit structure parallel redundancy structure in full accord with original system, and this method is not suitable for cascade structure, otherwise can cause the serious waste of resource;
2. unit redundancy is on the basis of original N units in series, and every phase increases one or two stand-by unit again, and conventional is N+1 redundancy; Once some cascade unit breaks down, this trouble unit of bypass is immediately devoted oneself to work redundancy unit simultaneously, replaces trouble unit; But because APF device works in non-malfunction in most cases, so the method can cause the waste of redundancy unit capacity;
3. on off state redundancy does not need additional firmware redundant resource, is to utilize location overlap or approaching Redundanter schalter state (being voltage vector) to replace breakdown switch state, thereby realizes fault-tolerant control, the most economical material benefit of the method; The middle pressure CS-APF fault tolerant control method the present invention relates to utilizes Redundanter schalter state to realize fault-tolerant control exactly.
Through consulting domestic and foreign literature, not yet find the research of " utilizing cascaded inverter Redundanter schalter state to realize the middle pressure CS-APF Fault Tolerance Control Technology of fault-tolerant control ".
Summary of the invention
(1) technical problem that will solve
In order to press the problem that CS-APF probability of failure is larger in solving, and reduce as much as possible hardware cost, the invention provides the two stagnant ring fault tolerant control methods of a kind of middle pressure CS-APF, the redundancy voltage vector that makes full use of cascaded inverter is realized fault-tolerant control, make CS-APF can nonserviceable under more accurate compensation harmonic electric current, thereby improve the power supply quality of China's intermediate voltage electric power system.
(2) technical scheme
In order to achieve the above object, the present invention relates to method comprises the steps:
(1) by the two stagnant rings of electric current, define the actual value i of source filter output offset current cwith reference value i c *between error △ i, wherein the outer shroud of the two stagnant rings of electric current guarantees the rapidity of current tracking, interior environmental protection card accuracy, and as the foundation of selecting voltage vector;
(2) control method under non-malfunction:
1. when current tracking error | △ i| is greater than outer ring width h 2time (| △ i|>=h 2), do not consider reference voltage space vector position, selection makes the fastest voltage vector of current error decrease speed, be that its corresponding d △ i/dt has the largest component with current error vector △ i opposite direction, making | △ i| approaches interior ring with the fastest speed, thereby realizes the quick tracking to reference current;
2. (h when current error is between interior ring and outer shroud 2> | △ i|>=h 1), select the voltage vector of corresponding error current differential amplitude minimum, with steady state error, and reduce switching frequency;
3. when error current is less than inner ring width h 1time (h 1> | △ i|>=0), output voltage vector will remain unchanged, to reduce average frequency of switching, shortcut calculation;
(3) when one or several cascade unit of CS-APF breaks down, can cause that this phase level number reduces, the selected voltage vector of said method may cannot be used due to fault, becomes false voltage vector; Now, first rapid short circuit trouble 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-false voltage vector to replace false voltage vector, be that chosen position overlaps or the immediate non-fault vector of effect substitutes, make the output current i of CS-APF ctrack reference value more accurately under nonserviceabling.
According to above-mentioned steps, select optimum voltage vector, the output current that makes CS-APF track reference value accurately under non-malfunction and malfunction, realizes the effective compensation of harmonic wave.
In addition, for keeping the DC voltage of receipts or other documents in duplicate at different levels unit balanced, need to carry out closed-loop control to DC side.
Particularly, step (3), when some cascade unit breaks down, can cause that this phase level number reduces.The voltage vector U selecting when former algorithm kduring for non-false voltage vector, calculate and finish, this vector is last selected voltage vector.If U kfor fault vector, select to substitute with immediate other the non-false voltage vector of its action effect, the non-fault vector that preferential chosen position overlaps, if the vector that all positions overlap is all fault vector, immediate other vector of chosen position and effect replaces U k.
Concrete vector alternative steps is as follows:
In the voltage vector-diagram of N rank cascaded inverter, by mid point, outwards have 2N regular hexagon (not comprising mid point), difference called after hexagon 1,2 ... 2N, has m(0 < m < N with cascaded inverter a in mutually) individual cascade unit breaks down as example:
Figure 2013104341693100002DEST_PATH_IMAGE001
work as U kwhen=(x, y, z) is arranged in the outermost m of voltage vector-diagram hexagon, the non-fault vector now overlapping without position can be selected, 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 with it immediate non-false voltage vector;
When reference voltage vector is positioned at sector III or IV, select (x+1, y, z) (x+2, y, z) ... in with it immediate non-false voltage vector;
When reference voltage vector is positioned at sector II or V, not affected by a phase fault;
N is larger for cascade exponent number, and phase place and Size Error that vector is replaced front and back are lower, and current tracking is more accurate;
Figure 2013104341693100002DEST_PATH_IMAGE002
work as U k=(x, y, z) is positioned at hexagon j(1≤j≤2N-m) time, the non-fault vector that now has position to overlap can be selected, and 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-false voltage vector;
When reference voltage vector is positioned at sector II or V, be not subject to a phase fault to affect (border is disregarded);
In like manner can obtain the voltage vector replacement method when b or c have a cascade unit to break down mutually.
(3) beneficial effect
The two stagnant ring fault tolerant control methods of the middle pressure CS-APF based on voltage vector method that the present invention proposes, solved the larger problem of CS-APF probability of failure, rapidity and the accuracy of having taken into account current tracking, have stronger fault freedom, pressure, powerful occasion in being applicable to very much.The method does not need additional hardware redundancy resource, and hardware cost is low, is pressed with the functional reliability of source filter in can significantly improving, and has the wide market space.
accompanying drawing explanation:
Fig. 1 is CS-APF topology diagram.
Fig. 2 is CS-APF cascade unit topology mechanism map and balanced auxiliary clamped circuit.
Fig. 3 is the two stagnant ring fault tolerant control method schematic diagrams of the middle pressure CS-APF based on voltage vector method.
Fig. 4 is the five level voltage vector distribution maps that 2 rank CS-APF are corresponding.
Five-level switch magnetic state scattergram when Fig. 5 is a phase 1 cell failure.
embodiment:
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 the present invention relates to is as shown in Figure 1: because APF requires have very high dynamic responding speed and switching frequency, so switching device selected IGBT, and rated voltage is 1700V.The exponent number N that is often in series need to determine according to application scenario, take 10KV distribution as example, retain 2 times of margins of safety, cell voltage 800-1000V at different levels are advisable, the cascade unit exponent number N being often in series is probably 10 left and right, in like manner can calculate the exponent number that other medium voltage network is corresponding.
(2) all pressures auxiliary circuit of cascade unit DC voltage
The Cascade H bridge unit topological diagram of the middle pressure CS-APF the present invention relates to and all auxiliary clamped circuit of pressure are as shown in Figure 2, the auxiliary circuit of each unit is connected with auxiliary circuit ac bus through isolating transformer by a full-bridge inverter, every shared ac bus mutually.Wherein Sac is auxiliary switch, and T is auxiliary transformer, auxiliary inversion bridge and main inverter bridge general DC busbar, and Udc is DC capacitor voltage.
(3) control circuit and drive circuit
Control circuit and the drive circuit of the middle pressure CS-APF the present invention relates to are as follows: control circuit adopts two DSP structures, by dual port RAM (IDT70V24s15), communicates, can data sharing.Wherein, DSP1 is responsible for detecting harmonic current as current reference value, and completes the control of DC side total voltage, and auxiliary circuit pwm signal produces; DSP2 is responsible for offset current and follows the tracks of control, produces the Bypass Control that PWM drives signal and trouble unit.IGBT drive circuit adopts the integrated driver module of IGBT of Beijing Luo Muyuan company.
(2) software section scheme
The two stagnant ring fault tolerant control methods of the middle pressure CS-APF based on voltage vector method that the present invention relates to are as shown in Figure 3: computational load current i first lin harmonic components, its negate is obtained to reference current i c *; By control algolithm, select optimum voltage vector, make APF output current under fault and non-failure condition, can both follow the tracks of exactly i c *thereby, realize harmonic compensation.
(1), under the non-failure condition of CS-APF, concrete control method is as follows:
as shown in the two stagnant ring in Fig. 3, when | △ i|>=h 2, current error is positioned at outer shroud, and error is larger.Now select space vector of voltage U kshould consider to reduce error rapidity, make its corresponding d △ i/dt there is the largest component with current error vector △ i opposite direction; Take Fig. 4 as example, now should in the corresponding maximum voltage vector in hexagon summit, select, current error is reduced rapidly, thereby realize the quick tracking to reference current, make error current approach interior ring with the fastest speed.
Figure 587104DEST_PATH_IMAGE002
as h2 > | △ i|>=h 1time, current error, between inner and outer rings, now should be selected the voltage vector of corresponding error current differential amplitude minimum, with steady state error, and reduces switching frequency, and error current is limited near dead band.By formula
Figure 2013104341693100002DEST_PATH_IMAGE003
visible, work as U k=u *meet the requirements most.
Figure 2013104341693100002DEST_PATH_IMAGE004
（1）
Figure 2013104341693100002DEST_PATH_IMAGE005
work as h 1> | △ i|>=0 o'clock, current error enters dead band, and now current error value can meet the requirement of stable state accuracy, and output voltage vector will remain unchanged, and to reduce average frequency of switching, improve the stability of a system.
The 2 rank CS-APF of take are example, and specific implementation method is as follows:
Fig. 4 is the 5 level voltage polar plots that 2 rank CS-APF are corresponding, and reference voltage vector u* is positioned at sector I, and error current △ i is positioned at sector V; Now, △ i in three-phase current berror is maximum, and bigger than normal.
When | △ i|>=h 2time, be chosen in the △ i vector voltage vector of projection maximum in the other direction, select voltage vector (404), with the fastest Speed Reduction i bthereby, current error is declined rapidly, now do not consider the physical location of reference voltage vector u*.
Work as h 2> | △ i|>=h 1time, first in 125 voltage vectors, select 8 voltage vectors to be selected, establish u a *, u b *, u c *for reference voltage vector u *component under three-phase a b c coordinate system, U a *, U b *, U c *for three-phase reference voltage level value (0≤U a *, U b *, U c *≤ 4), both sides relation is as formula
Figure 2013104341693100002DEST_PATH_IMAGE006
:
（2）
Level vector is
Figure 2013104341693100002DEST_PATH_IMAGE008
.Due to U a *, U b *, U c *might not be integer, therefore, the level closing on up and down respectively rounds, for example, work as U a *=1.5 o'clock, round up and down as level 1 and 2.U like this *there will be 2 3=8 kinds of combinations.By formula
Figure 617376DEST_PATH_IMAGE003
discretization:
Figure 2013104341693100002DEST_PATH_IMAGE009
（3）
It in formula, is the systematic sampling cycle.△ i is reduced, must guarantee (u*-U k) and △ i opposite direction, i.e. inner product < △ i n, (u*-U k) > is less than 0, according to this condition, 8 vectors to be selected carried out to primary screening.According to vector, change minimum principle, optimum voltage vector will approach u*, i.e. U as far as possible kmeet:
Figure 2013104341693100002DEST_PATH_IMAGE010
（4）
According to this condition, remaining vector to be selected is carried out to primary screening, select optimal value.
Work as h 1> | △ i|>=0 o'clock, kept the voltage vector in a upper sampling period constant.When certain cascade module broke down by short circuit moment, non-trouble unit DC voltage may change, and makes the actual value of the voltage vector that originally calculated that deviation occur.Now, in the situation that current error △ i is very little, carry out again precision rectification unnecessary.
(2), under CS-APF breaks down situation, the two stagnant ring fault tolerant control methods of CS-APF based on voltage space vector pwm theory are as follows:
When certain of N rank cascade circuit has m(0 < m < N in mutually) individual cascade unit is when break down, and affected by trouble unit, and this phase level number reduces 2m, and the voltage vector of some sector in voltage vector-diagram can reduce.When there is cell failure separately mutually in a, b, c, on each sector vector to affect situation different.Cascade cell failure is as shown in the table on the impact of each sector voltage vector, and √ represents that fault is influential to this sector, * indicate, without impact, wherein not comprise the voltage vector of sector intersection.
Figure 2013104341693100002DEST_PATH_IMAGE011
When breaking down, rapid closing auxiliary switch Sac is malfunctioning module short circuit, then carries out fault-tolerant control.
First, by former control strategy, select optimal voltage vector U kif, U kfor non-false voltage vector, calculate and finish; If U kfor fault vector, select to replace with immediate other the non-false voltage vector of its action effect, the non-fault vector that preferential chosen position overlaps, if the vector that all positions overlap is all fault vector, now can only replace by position and immediate other vector of effect.
The concrete replacement method of fault vector is as follows:
In the voltage vector-diagram of N rank cascaded inverter, by mid point, outwards have 2N regular hexagon (not comprising mid point), difference called after hexagon 1,2 ... 2N, has m(0 < m < N mutually with a) individual cascade unit breaks down as example.
Figure 917645DEST_PATH_IMAGE001
the optimal voltage vector U selecting when former control strategy kwhen=(x, y, z) is arranged in the outermost m of polar plot hexagon, the non-fault vector now overlapping without position can be selected.
When reference voltage vector is positioned at sector I or VI, select (x-1, y, z) (x-2, y, z) ... in with it immediate non-false voltage vector; When reference voltage vector is positioned at sector III or IV, select (x+1, y, z) (x+2, y, z) ... in with it immediate non-false voltage vector; When reference voltage vector is positioned at sector II or V, not affected by a phase fault.N is larger for cascade exponent number, and phase place and Size Error that vector is replaced front and back are lower.
This method is equivalent to U a *when the level closing on up and down rounds, be subject to the short circuit impact of a phase fault unit, upper level level is not existed, therefore just two continuous level round downwards.For example work as U a *, should round up and down level 2 and 3 at=2.5 o'clock.If level 3 does not exist due to fault, U a *rounding downwards is continuously 2 and 1.
the optimal voltage vector U selecting when former control strategy k=(x, y, z) is positioned at hexagon j(1≤j≤2N-m) time, the non-fault vector that now has position to overlap can be selected.
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-false voltage vector; When reference voltage vector is positioned at sector II or V, be not subject to a phase fault to affect (border is disregarded).
The 2 rank CS-APF of take are example, and specific implementation method is as follows:
When a has a cascade unit to break down mutually, voltage vector-diagram as shown in Figure 5, the vector representation false voltage vector in figure on dotted line, the point on solid line represents non-fault vector.Voltage vector alternative method when a has Unit 1 to break down in mutually sees the following form.
In like manner can obtain the voltage vector replacement method when b or c have a cascade unit to break down mutually.
(3) hysteresis band is selected and switching loss
Conventionally the switching frequency of hysteresis band and device is similar to and is inverse ratio.Hysteresis band is narrower, and switching frequency is higher, but now the tracking accuracy of offset current also can improve; On the contrary, hysteresis band is wider, and switching frequency is lower, but tracking accuracy is also low.Reduce switching loss and be not exclusively equal to reduction switching frequency, also to flow through electric current and the soft switch technique of device relevant with switching time.Visible, in the situation that control population mean switching frequency is substantially constant, according to the adjustment hysteresis band of the size reasonable of three-phase current norm, can effectively reduce master switch loss, contribute to DC side voltage of converter to control simultaneously.
APF requires devices switch frequency higher, and the loss of IGBT be take break-make loss as main.Suppose in unit interval T every phase switch motion n time, ignoring in on-state loss and off-state loss situation, every phase switching loss power is:
Figure 2013104341693100002DEST_PATH_IMAGE013
（5）
U dcfor DC side voltage of converter, suppose that size is constant.T onfor service time, i (k)be the switching current of the k time, formula
Figure 2013104341693100002DEST_PATH_IMAGE014
can be reduced to:
Figure 2013104341693100002DEST_PATH_IMAGE015
（6）
Visible, switching loss and switching frequency, DC voltage, service time and switch average current i avrelevant.When three-phase current norm is larger, relaxes hysteresis band, thereby reduce switching frequency; When three-phase current norm hour, appropriateness is dwindled displacement width, improves switching frequency, thereby in the situation that population mean switching frequency is substantially constant, reduces master switch loss, and then controls and lay the foundation for the equilibrium of DC voltage.
(4) Pressure and Control of cascade unit DC voltage
As shown in Figure 2, first the PI adjusting by software program makes every phase N unit direct voltage summation keep constant, more reasonably drives auxiliary circuit, by ac bus, realizes the Power Exchange between each unit, finally reaches electric voltage equalization, stable.
It should be noted that, during due to IGBT rated voltage type selecting, conventionally all can retain 2-3 safety allowance doubly, so in the cascaded inverter of N rank 1 or a few cells break down after by short circuit, in residue unit, IGBT bears voltage and can not surpass permissible value.
(5) trouble unit bypass technology
When cascade unit is short-circuited or during open circuit fault, as shown in Figure 2, first, blocks this unit PWM and drive signal, the switch S ac on closed this element right side, by the unit short circuit breaking down, and the switch S ac that is connected with common bus of switching units left side.In addition, also to, sending out failure code to host computer, carry out corresponding fault-tolerant control.

Claims (2)

1. the two stagnant ring fault tolerant control methods of the middle pressure CS-APF based on voltage space vector pwm theory, is characterized in that, the step of described control method comprises:
(1) by the two stagnant rings of electric current, define the actual value i of source filter output offset current cwith reference value i c *between error △ i, wherein the outer shroud of the two stagnant rings of electric current guarantees the rapidity of current tracking, interior environmental protection card accuracy, and as the foundation of selecting voltage vector;
(2) control method under non-malfunction:
1. when current tracking error | △ i| is greater than outer ring width h 2time (| △ i|>=h 2), do not consider reference voltage space vector position, selection makes the fastest voltage vector of current error decrease speed, be that its corresponding d △ i/dt has the largest component with current error vector △ i opposite direction, making | △ i| approaches interior ring with the fastest speed, thereby realizes the quick tracking to reference current;
2. (h when current error is between interior ring and outer shroud 2> | △ i|>=h 1), select the voltage vector of corresponding error current differential amplitude minimum, with steady state error, and reduce switching frequency;
3. when error current is less than inner ring width h 1time (h 1> | △ i|>=0), output voltage vector will remain unchanged, to reduce average frequency of switching, shortcut calculation;
(3) when one or several cascade unit of CS-APF breaks down, can cause that this phase level number reduces, the selected voltage vector of said method may cannot be used due to fault, becomes false voltage vector; Now, first rapid short circuit trouble 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-false voltage vector to replace false voltage vector, be that chosen position overlaps or the immediate non-fault vector of effect substitutes, make the output current of CS-APF can nonserviceable under track reference value more accurately.
2. two stagnant ring fault tolerant control methods of the middle pressure CS-APF based on voltage space vector pwm theory according to claim 1, is characterized in that: in described step (3), and the voltage vector U selecting when step (2) k(U during for non-false voltage vector kbe not subject to the impact of this fault, can normally use), calculate and finish, this vector is last selected voltage vector; If U kfor false voltage vector, select to substitute with immediate other the non-false voltage vector of its action effect, the non-fault vector that preferential chosen position overlaps, if the vector that all positions overlap is all false voltage vector, immediate other vector of chosen position and effect replaces U k, concrete vector alternative steps is as follows:
In the voltage vector-diagram of N rank cascaded inverter, by mid point, outwards have 2N regular hexagon (not comprising mid point), difference called after hexagon 1,2 ... 2N, has m(0 < m < N with cascaded inverter a in mutually) individual cascade unit breaks down as example;
Figure 2013104341693100001DEST_PATH_IMAGE001
work as U kwhen=(x, y, z) is arranged in the outermost m of voltage vector-diagram hexagon, the non-fault vector now overlapping without position can be selected, 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 with it immediate non-false voltage vector;
When reference voltage vector is positioned at sector III or IV, select (x+1, y, z) (x+2, y, z) ... in with it immediate non-false voltage vector;
When reference voltage vector is positioned at sector II or V, not affected by a phase fault;
N is larger for cascade exponent number, and phase place and Size Error that vector is replaced front and back are lower, and current tracking is more accurate;
Figure 2013104341693100001DEST_PATH_IMAGE002
work as U k=(x, y, z) is positioned at hexagon j(1≤j≤2N-m) time, the non-fault vector that now has position to overlap can be selected, and 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-false voltage vector;
When reference voltage vector is positioned at sector II or V, be not subject to a phase fault to affect (border is disregarded);
In like manner can obtain the voltage vector replacement method when b or c have a cascade unit to break down mutually.
CN201310434169.3A 2013-09-23 2013-09-23 Middle pressure CS-APF double hysteresis fault tolerant control method based on voltage vector method Expired - Fee Related CN103532408B (en)

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