CN103378759A - Method for controlling NPC three-level inverter fault redundancy - Google Patents
Method for controlling NPC three-level inverter fault redundancy Download PDFInfo
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Abstract
The invention discloses a method for controlling NPC three-level inverter fault redundancy. The method for controlling the NPC three-level inverter fault redundancy comprises the following steps of (1) carrying out fault detection on an NPC three-level inverter in real time to confirm a fault position and a fault type, (2) confirming lost voltage vectors according to the fault position and the fault type, and drawing a vector diagram of fault states, (3) analyzing whether the inverter can continue to run or not under the fault states according to the redrawn vector diagram, (4) analyzing whether the inverter can run in an original level or not under the fault states according to the redrawn vector diagram, and (5) for the fault states under which the inverter can continue to run, reselecting resultant vectors, calculating the action time of all the resultant vectors, optimizing the switching sequence of the vectors, and forming a redundancy control impulse train. The method for controlling the NPC three-level inverter fault redundancy solves the problem of reliability of the three-level inverter based on a software method and effectively improves the reliability of the system on the basis that the cost of hardware of the system is not increased.
Description
Technical field
The present invention relates to a kind of NPC three-level inverter fault redundance control method.
Background technology
Powerful conversion can realize that by number of ways multi-electrical level inverter becomes the study hotspot in high-power high voltage conversion field because it has a series of advantage.Diode neutral point clamp type (NPC) three-level inverter becomes the emphasis direction of multi-level high-voltage high-power inverter research because its topological structure and control method comparative maturity all.Compare with traditional two-level inverter topological structure, the advantage of diode neutral point clamped multi three-level inverter mainly contains:
(1) on average the forward blocking voltage that bears of each main switch device be the DC side busbar voltage half;
(2) can reduce greatly harmonic wave, reduce switching frequency, reduce system loss, as reaching identical output performance index and weighing with switching frequency, three level are 1/5 of two level switch frequencies, and its voltage build-up rate (dv/dt) is 1/2 of two-level inverter, and current-rising-rate (di/dt) also is accompanied by minimizing, can greatly reduce the infringement to the insulation property of motor, increase the working life of motor;
(3) owing to increased level number, relative reduce the amplitude of each level, reduced the variation of voltage, the current pulsation composition that main circuit contains reduces, and has also reduced electromagnetic noise and torque pulsation simultaneously;
(4) unsettled if three-level inverter connects star load and the mid point of three-phase symmetrical, just can not produce 3 the doubly harmonic current of several in the load.
Although the NPC three-level inverter has above many merits, yet it also has the shortcomings such as system configuration complexity, required electric power electronic device be too much.The complexity of structure and device increase the increase that has correspondingly caused multi-electrical level inverter operation troubles rate, not only increased the operation and maintenance cost of inverter, and reduced the functional reliability of the whole system of its driving, had a strong impact on quality and the safety of producing.In fields such as electric power, traffic, space flight, military project, mines, for the continuous reliability service of equipment aspect require highly, therefore, the research that improves the multi-electrical level inverter reliability is had important practical significance and economic worth.
At present, the reliability of raising multi-electrical level inverter mainly is by the following method:
1, the parallel running of inverter
Adopt two or more inverter parallels, not only can effectively increase the reliability of system, and can increase the capacity of inverter, reduce output current harmonics.But this method causes the structure of system very complicated, and control ratio is difficulty, and has circulation and equal flow problem, and practical ranges is less.
2, inverter adopts modular construction
Each brachium pontis of inverter adopts modularized design, each module is designed to form for convenience detach and that install, when a certain device of inverter breaks down, directly change the whole bridge arm module at defective device place, within the shortest time, recover the operation of inversion system.Although the method has shortened the fault time of system effectively, in case the still necessary emergency shutdown that breaks down can not be considered the actual motion requirement of institute's driving arrangement, and will reserve sufficient spare module.
3, the inverter hardware topology adopts redundancy structure
Use for reference the three-phase four-leg inverter topological structure that present field of power electronics is being studied, system is an additional brachium pontis of design in addition.When a certain device of inverter broke down, control system continued the operation of the system that keeps by additional brachium pontis, until equipment when allowing to shut down maintenance damage device.The method can be accomplished the continuous and steady operation of system, but that cost is the structure of system is more complicated, and the hardware cost of system increases, and control method is also complicated.
Above method all is to improve the operational reliability of inverter from the hardware of system and topological structure aspect, does not take full advantage of the redundancy properties on the software control method that multi-electrical level inverter itself has.
Summary of the invention
For the problems referred to above, the purpose of this invention is to provide a kind of NPC three-level inverter fault redundance control method, utilize the redundancy properties of NPC three-level inverter space voltage vector, realize that by software approach the continuation under the NPC three-level inverter failure condition moves, and improves the reliability of system effectively on the basis that does not increase the system hardware cost.
For achieving the above object, the present invention takes following technical scheme:
A kind of NPC three-level inverter fault redundance control method, it may further comprise the steps:
A, in real time the NPC three-level inverter is carried out device fault and detect, determine location of fault and fault type;
B, determine the space voltage vector that loses under the malfunction according to abort situation and fault type, draw the space voltage vector distribution map of malfunction;
The space voltage vector distribution map that C, basis are drawn again analyzes whether the NPC three-level inverter can continue operation under this malfunction, namely whether can also synthesize the rotary reference space voltage vector;
The space voltage vector distribution map that D, basis are drawn again, analyze whether the NPC three-level inverter can simplely move under this kind malfunction, namely calculate the scope of the rotary reference space voltage vector that can synthesize, whether still can form the regular hexagon inscribed circle that long voltage vector consists of;
E, for the malfunction that can continue to move (comprising normal operation and degraded running), according to the space voltage vector distribution map of again drawing, reselect resultant vector, and the action time of calculating each vector, each vector transfer sequence is optimized, forms new Redundant Control pulse train.
Preferably, in steps A, need in real time the NPC three-level inverter to be carried out device fault and detect, determine abort situation and fault type.The electronic power switch device fault type of NPC three-level inverter comprises short trouble and open fault.The position of short trouble comprises two clamp diodes of each brachium pontis, two switching tubes and two inboard switching tubes in each brachium pontis outside; The position of open fault comprises two clamp diodes of each brachium pontis, two switching tubes in each brachium pontis outside.Detect the short trouble position, when the voltage of real-time detection always is zero, the power electronic device of then judging the relevant position fault that is short-circuited; Detect the open fault position, when the voltage of real-time detection total when non-vanishing, the power electronic device generation open fault of relevant position then.
Preferably, in step B, adopt following method to repaint the space voltage vector distribution map: at first the analysis device fault causes the loss of the exportable level state of NPC three-level inverter, then will comprise the vector that loses level state and remove, and can obtain new space voltage vector distribution map.
Preferably, in step C, when the clamp diode of the close P utmost point of NPC three-level inverter fault phase is short-circuited fault, fault phase loss P level state; When the clamp diode of the close N utmost point of NPC three-level inverter fault phase is short-circuited fault, fault phase loss N level state; When a switching tube in the NPC three-level inverter fault phase outside is short-circuited fault, fault phase loss O level state; When the inboard switching tube near the P utmost point of NPC three-level inverter fault phase is short-circuited fault, fault phase loss N level state; When the inboard switching tube near the N utmost point of NPC three-level inverter fault phase is short-circuited fault, fault phase loss P level state.When NPC three-level inverter fault phase clamp diode generation open fault, fault phase loss O level state; When the close P utmost point switching tube generation open fault in the NPC three-level inverter fault phase outside, fault phase loss P level state; When the NPC three-level inverter fault phase outside during near the switching tube generation open fault of the N utmost point, fault phase loss N level state.
Preferably, in step D, the vector among the space voltage vector figure can be done following classification by the amplitude size:
According to the failure condition that detects, the malfunction space voltage vector distribution map that repaints out can be divided into four classes:
D1: fault brachium pontis loss O level state.Situation for fault phase loss O level state, because small vector has redundant vector, the not loss of large vector, therefore, the vector that loses among the space voltage vector figure only has middle vector and a zero vector, the polar plot profile is identical during with normal condition, so inverter still can simplely move, amplitude that can the synthesized reference space voltage vector is with identical under normal circumstances.
D2: fault brachium pontis loss P level state.Situation for fault phase loss P level state, large vector among the space voltage vector figure, middle vector, small vector and zero vector all have loss, but because small vector and zero vector have redundant vector, therefore utilize redundant vector, still can surround orthohexagonal polar plot.Because large vector and middle vector are imperfect, new regular hexagon polar plot is comprised of small vector and zero vector, therefore little when the polar plot profile is than normal condition, inverter needs degraded running, but this moment the synthesized reference space voltage vector amplitude be under normal circumstances 1/2.
D3: fault brachium pontis loss N level state.Situation for fault phase loss N level state, large vector, middle vector, small vector and zero vector all have loss among the space voltage vector figure, but because small vector and zero vector have redundant vector, therefore utilize redundant vector, still can surround orthohexagonal polar plot.Because large vector and middle vector are imperfect, new polar plot is comprised of small vector and zero vector, therefore little when regular hexagon polar plot profile is than normal condition, inverter needs degraded running, but this moment the synthesized reference space voltage vector amplitude be under normal circumstances 1/2.
D4: fault brachium pontis loss P level state and N level state.Lose simultaneously the situation of P level state and N level state for fault phase, large vector among the space voltage vector figure, middle vector, small vector and zero vector all have loss, only remaining two middle vectors, six small vectors and a zero vector can use, and six small vectors and zero vector surround orthohexagonal space voltage vector figure just, and this moment, fault phase was exported the O level state all the time.Because new polar plot is comprised of small vector and zero vector, so the polar plot profile is little during than normal condition, and inverter needs degraded running, but at this moment the amplitude of synthesized reference space voltage vector be under normal circumstances 1/2.
Preferably, in step e, the principle that reselects effect vector and optimization vector sequence of operation is:
E1: during each diverter switch state, relate to few switching device of trying one's best;
E2: on the basis of principle E1, satisfy each switch periods as far as possible and all begin with Zero voltage vector, finish with Zero voltage vector again.
The present invention is owing to take above technical scheme, its advantage is: on the basis of the space voltage vector figure under analysis NPC three-level inverter device breaks down situation, take full advantage of the redundant space voltage vector, neither change the topological structure of inverter, do not increase in addition hardware device yet, just can realize that by software control the continuation under the fault of converter state moves, and has improved the reliability of system.
Description of drawings
Fig. 1 is NPC three-level inverter topology structure chart;
Fig. 2 is NPC three-level inverter A phase mode of operation one schematic diagram;
Fig. 3 is NPC three-level inverter A phase mode of operation two schematic diagrams
Fig. 4 is NPC three-level inverter A phase mode of operation three schematic diagrams
Fig. 5 is the space voltage vector figure under the NPC three-level inverter normal condition;
Space voltage vector figure when Fig. 6 is NPC three-level inverter A phase fault loss O level state;
Space voltage vector figure when Fig. 7 is NPC three-level inverter A phase fault loss P level state;
Space voltage vector figure when Fig. 8 is NPC three-level inverter A phase fault loss N level state;
Space voltage vector figure when Fig. 9 is NPC three-level inverter A phase fault loss P, N level state.
Embodiment
Can be got by the space voltage vector distribution map under the NPC three-level inverter normal condition shown in Figure 5, space voltage vector figure is divided into I, II, III, IV, six sectors of V, VI, and each sector comprises again A, B, four minizones of C, D.Vector among the space voltage vector figure can divide by the amplitude size does following classification:
The below take the mutually different device of A be short-circuited or open fault as example, technical scheme of the present invention is described in detail.
So-called three level refer to that the voltage that every phase output terminal of inverter AC is obtained from middle DC loop has three kinds of current potentials, i.e. positive terminal voltage P, negative terminal voltage N and mid point zero potential O.From the structure of a phase brachium pontis of three-level inverter main circuit, four switching device on off states have 16 kinds, but because S
11With S
13, S
21With S
23, S
31With S
33Relation (the same S of logic NOT
12With S
14, S
22With S
24, S
32With S
34Also be the relation of logic NOT), so effective status only has three kinds of situations.The below mutually as example, describes three kinds of output states of phase voltage take A.
Mode of operation 1:S
11, S
12Conducting, S
13, S
14Turn-off.As shown in Figure 2, if current i
AFor just (flowing to load from inverter), then power supply is to capacitor C
1Charging, electric current flows through main switch S
11, S
12, ignore tube voltage drop, this phase output terminal voltage is equal to P point current potential, is V
Dc/ 2; If load current is negative (from load flow to inverter), electric current flows through and main switch S
11, S
12Related sustained diode
1, D
2To capacitor C
1Charging, then this phase output terminal voltage also is equal to P point current potential.
Mode of operation 2:S
12, S
13Conducting, S
11, S
14Turn-off.As shown in Figure 3, if load current is positive direction, then power supply is to capacitor C
1Charging, electric current flows through clamping diode D
1, main switch S
12, this moment, this phase output terminal voltage was equal to O point current potential, was 0; If load current is negative direction, electric current flows through main switch S
13, clamping diode D
2, power supply is to capacitor C
2Charging, then this phase output terminal voltage also is equal to O point current potential.
Mode of operation 3:S
13, S
14Conducting, S
11, S
12Turn-off.As shown in Figure 4, if the A phase current is negative, then power supply is to capacitor C
2Charging, electric current flows through main switch S
13, S
14, this phase output terminal voltage is equal to N point current potential, for-V
Dc/ 2; If the A phase current is for just, electric current flows through and main switch S
13, S
14Fly-wheel diode in parallel is to capacitor C
2Charging, then this phase output terminal voltage also is equal to N point current potential.
The on off state of three kinds of mode of operations sees the following form with the relation of every phase output voltage.
| Mode of operation | S 11 | S 12 | S 13 | S 14 | Every phase output voltage | Level state |
| 1 | Logical | Logical | Disconnected | Disconnected | +V dc/2 | P |
| 2 | Disconnected | Logical | Logical | Disconnected | 0 | O |
| 3 | Disconnected | Disconnected | Logical | Logical | -V dc/2 | N |
Embodiment one: the NPC three-level inverter is carried out the device fault Real-Time Monitoring, when detecting device S
11When terminal voltage is always zero, S
11The pipe fault that is short-circuited if still allow inverter A export mutually the O level state this moment, then can cause capacitor C
1Short circuit, therefore, S
11Pipe is short-circuited after the fault, and A can only export two kinds of level states of P, N mutually, can not export the O level state.Space voltage vector distribution map when Fig. 6 is the fault state, among the figure two scratch be the vector of breakdown loss.A loses mutually the vector that loses behind the O level state and comprises zero vector (OOO), small vector (ONO, ONN, OON, OPO, OPP, OOP) and middle vector (OPN, ONP).Observe Fig. 6 as can be known, the zero vector of loss and small vector all have redundant vector, and the middle vector of second, five sectors loss does not have redundant vector.When reference space voltage vector is positioned at first and third, four, during six sectors, during the synthesized reference vector, the selection of effect vector is the same during still with normal condition, at first determine the sector at reference vector place, then determine to come the synthesized reference vector by three vector actings in conjunction of fixing a point between little delta between its little delta that is positioned at.When reference space voltage vector is positioned at the A minizone of second, five sectors, utilize the redundant vector of small vector, the same in the time of still can be with normal condition, utilize two small vectors and zero vector synthesized reference vector; When reference space voltage vector is positioned at B, C, the D minizone of second, five sectors, because middle vector is unavailable, come the synthesized reference vector with zero vector and two large vectors, but identical when the amplitude of synthesized reference space voltage vector is with normal condition at this moment, inverter still can simplely move.
Use above-mentioned strategy to carry out Redundant Control based on SVPWM, and consider to try one's best little switching loss, obtaining vector, to send sequence as follows:
Embodiment two: the NPC three-level inverter is carried out the device fault Real-Time Monitoring, when detecting device S
11Terminal voltage when being always nonzero value, S
11Open fault occurs in pipe, and this moment, inverter A can't export the P level state mutually, therefore, and S
11Pipe is short-circuited after the fault, and A can only export two kinds of level states of O, N mutually.Space voltage vector distribution map when Fig. 7 is the fault state, among the figure two scratch be the vector of breakdown loss, A loses mutually the vector that loses behind the P state and comprises zero vector (PPP), small vector (PPO, POO, POP), middle vector (PON, PNO) and large vector (PPN, PNN, PNP).In the polar plot, the zero vector of loss and small vector all have redundant vector; The first, six sectors, the middle vector of loss does not have redundant vector, first and second, five, six sectors, the large vector of loss does not have redundant vector.But examining Fig. 7 can find, the line of six small vector terminal points still can surround a little regular hexagon, that is to say, in the time of within reference space voltage vector is positioned at this little regular hexagon, still can be synthesized by small vector and zero vector acting in conjunction, the NPC three-level inverter still can be kept and continue operation.During the synthesized reference vector, at first determine the sector at reference vector place under this kind failure condition, then utilize three vector actings in conjunction of A minizone, this sector triangular apex to come the synthesized reference vector.Because reference space voltage vector is just synthesized by small vector and zero vector acting in conjunction under this kind failure condition, therefore, but carry out the amplitude of blended space voltage vector after the Redundant Control be reduced to original 1/2, the inverter degraded running.
Use above-mentioned strategy to carry out Redundant Control based on SVPWM, and consider to try one's best little switching loss, obtaining pulse, to send sequence as follows:
Embodiment three: the NPC three-level inverter is carried out the device fault Real-Time Monitoring, when detecting device S
12Terminal voltage when being always zero, S
12The pipe fault that is short-circuited if still allow inverter A export mutually the N level state this moment, then can cause capacitor C
2Short circuit, therefore, S
12Pipe is short-circuited after the fault, and A can only export two kinds of level states of P, O mutually, can not export the N level state.Space voltage vector distribution map when Fig. 8 is the fault state, among the figure two scratch be the vector of breakdown loss, A loses mutually the vector that loses behind the N state and comprises zero vector (NNN), small vector (NON, NOO, NNO), middle vector (NPO, NOP) and large vector (NPN, NPP, NNP).In the polar plot, the zero vector of loss and small vector all have redundant vector; Third and fourth sector, the middle vector of loss does not have redundant vector, second and third, four, five sectors, the large vector of loss does not have redundant vector.Examining Fig. 8 can find, the line of six small vector terminal points still can surround a little regular hexagon, that is to say, in the time of within reference space voltage vector is positioned at this little regular hexagon, still can be synthesized by small vector and zero vector acting in conjunction, the NPC three-level inverter still can be kept and continue operation.During the synthesized reference vector, at first determine the sector at reference vector place under this kind failure condition, then utilize three vector actings in conjunction of A minizone, sector triangular apex to come the synthesized reference vector.Because reference space voltage vector is synthetic by small vector and zero vector acting in conjunction under this kind failure condition, therefore, but carry out the amplitude of blended space voltage vector after the Redundant Control be reduced to original 1/2, the inverter degraded running.
Use above-mentioned strategy to carry out Redundant Control based on SVPWM, and consider to try one's best little switching loss, obtaining pulse, to send sequence as follows:
Embodiment four: the NPC three-level inverter is carried out the device fault Real-Time Monitoring, when detecting device S
13When terminal voltage is always zero, S
13The pipe fault that is short-circuited if still allow inverter A export mutually the P level state this moment, then can cause capacitor C
2Short circuit, therefore, S
13Pipe is short-circuited after the fault, and A can only export two kinds of level states of O, N mutually, can not export the P level state; Meanwhile detect device S
14Terminal voltage is always non-zero, S
14Open fault occurs in pipe, and this moment, inverter A can't export the N level state mutually, and therefore, this moment, A can only export the O level state mutually.Space voltage vector figure when Fig. 9 is the fault state, among the figure two scratch be the vector of breakdown loss, A loses mutually the vector that loses behind P and the N state and comprises zero vector (PPP, NNN), small vector (PPO, POO, POP, NON, NOO, NNO), middle vector (PON, PNO, NPO, NOP) and large vector (PPN, PNN, PNP, NPN, NPP, NNP).In the polar plot, the zero vector of loss and small vector all have redundant vector; First and third, four, six sectors, the middle vector of loss does not have redundant vector, in the whole polar plot without available large vector.But examining Fig. 9 can find, the line of six small vector terminal points still can surround a little regular hexagon, that is to say, in the time of within reference space voltage vector is positioned at this little regular hexagon, still can be synthesized by small vector and zero vector acting in conjunction, the NPC three-level inverter still can be kept and continue operation.During the synthesized reference vector, at first determine the sector at reference vector place under this kind failure condition, then utilize three vector actings in conjunction of A minizone, sector triangular apex to come the synthesized reference vector.Because reference space voltage vector is synthetic by small vector and zero vector acting in conjunction under this kind failure condition, therefore, but carry out the amplitude of blended space voltage vector after the Redundant Control be reduced to original 1/2, the inverter degraded running.
Use above-mentioned strategy to carry out Redundant Control based on SVPWM, and consider to try one's best little switching loss, obtaining pulse, to send sequence as follows:
Above-mentioned four embodiment break down as example with A phase power electronic device, have elaborated the redundancy control method of inverter, and are same, and when B phase or C broke down mutually, those skilled in the art can carry out Redundant Control to inverter according to above-described embodiment.The present invention does not change the topological structure of inverter, does not need to increase hardware device, only adopts the method for software control just can realize the Redundant Control of inverter, has improved the operational reliability of inverter, has also saved cost.
Claims (6)
1. a fault redundance control method that is used for based on the NPC three-level inverter of SVPWM is characterized in that, comprising:
A, in real time the NPC three-level inverter is carried out device fault and detect, determine location of fault and fault type;
B, determine the space voltage vector that loses under the malfunction according to abort situation and fault type, draw the space voltage vector distribution map of malfunction;
The space voltage vector distribution map that C, basis are drawn again analyzes whether the NPC three-level inverter can continue operation under this malfunction, namely whether can also synthesize the rotary reference space voltage vector;
The space voltage vector distribution map that D, basis are drawn again, analyze whether the NPC three-level inverter can simplely move under this kind malfunction, namely calculate the scope of the rotary reference space voltage vector that can synthesize, whether still can form the regular hexagon inscribed circle that long voltage vector consists of;
E, for the malfunction that can continue to move, comprise normal operation and degraded running, according to the space voltage vector figure that again draws, reselect resultant vector, and the action time of calculating each vector, each vector transfer sequence is optimized, form new Redundant Control pulse train.
2. NPC three-level inverter fault redundance control method according to claim 1 is characterized in that, in the described steps A, needs in real time the NPC three-level inverter to be carried out device fault and detects, and determines fault type and abort situation.The fault type of the electronic power switch device of NPC three-level inverter comprises short trouble and open fault.The position of short trouble comprises two switching tubes of two clamp diodes of each brachium pontis, close dc bus one side and two switching tubes of close mid point one side; The position of open fault comprises: two switching tubes in two clamp diodes of each brachium pontis, each brachium pontis outside.Detect the short trouble position, when the voltage of real-time detection always is zero, the power electronic device of then judging the relevant position fault that is short-circuited; Detect the open fault position, when the voltage of real-time detection total when non-vanishing, the power electronic device generation open fault of relevant position then.
3. NPC three-level inverter fault redundance control method according to claim 1, it is characterized in that, among the described step B, adopt following method to repaint the space voltage vector distribution map: at first the analysis device fault causes the loss of the exportable level state of NPC three-level inverter, then will comprise the vector that loses level state and remove, can obtain new space voltage vector distribution map.
4. NPC three-level inverter fault redundance control method according to claim 1 is characterized in that, among the described step C, and when the clamp diode of the close P utmost point of NPC three-level inverter fault phase is short-circuited fault, fault phase loss P level state; When the clamp diode of the close N utmost point of NPC three-level inverter fault phase is short-circuited fault, fault phase loss N level state; When a switching tube in the NPC three-level inverter fault phase outside is short-circuited fault, fault phase loss O level state; When the inboard switching tube near the P utmost point of NPC three-level inverter fault phase is short-circuited fault, fault phase loss N level state; When the inboard switching tube near the N utmost point of NPC three-level inverter fault phase is short-circuited fault, fault phase loss P level state.When NPC three-level inverter fault phase clamp diode generation open fault, fault phase loss O level state; When the close P utmost point switching tube generation open fault in the NPC three-level inverter fault phase outside, fault phase loss P level state; When the NPC three-level inverter fault phase outside during near the switching tube generation open fault of the N utmost point, fault phase loss N level state.
5. NPC three-level inverter fault redundance control method according to claim 1, it is characterized in that, among the described step D, vector among the space voltage vector figure can divide by the amplitude size does following classification: large vector, and corresponding three-phase output level state comprises PNN, PPN, NPN, NPP, NNP, PNP; Middle vector, corresponding three-phase output level state comprises PON, OPN, NPO, NOP, ONP, PNO; Small vector, corresponding three-phase output level state comprises POO, ONN, PPO, OON, OPO, NON, OPP, NOO, OPP, NOO, POP, ONO; Zero vector, corresponding three-phase output level state comprises PPP, OOO, NNN.
According to the failure condition that detects, the malfunction space voltage vector distribution map that repaints out can be divided into four classes:
D1: fault brachium pontis loss O level state.Situation for fault phase loss O level state, because small vector has redundant vector, the not loss of large vector, the vector that loses among the space voltage vector figure only has middle vector and a zero vector, the polar plot profile is identical during with normal condition, so inverter still can simplely move, get final product the amplitude of synthesized reference space voltage vector with identical under normal circumstances.
D2: fault brachium pontis loss P level state.Situation for fault phase loss P level state, large vector, middle vector, small vector and zero vector all have loss among the space voltage vector figure, but because small vector and zero vector have redundant vector, therefore utilize redundant vector, still can surround orthohexagonal polar plot.Because large vector and middle vector are imperfect, new regular hexagon polar plot is comprised of small vector and zero vector, therefore little when the polar plot profile is than normal condition, inverter needs degraded running, but this moment the synthesized reference space voltage vector amplitude be under normal circumstances 1/2.
D3: fault brachium pontis loss N level state.Situation for fault phase loss N level state, large vector, middle vector, small vector and zero vector all have loss among the space voltage vector figure, but because small vector and zero vector have redundant vector, therefore utilize redundant vector, still can surround orthohexagonal polar plot.Because large vector and middle vector are imperfect, new polar plot is comprised of small vector and zero vector, therefore little when regular hexagon polar plot profile is than normal condition, inverter needs degraded running, but this moment the synthesized reference space voltage vector amplitude be under normal circumstances 1/2.
D4: fault brachium pontis loss P level state and N level state.Lose simultaneously the situation of P level state and N level state for fault phase, large vector, middle vector, small vector and zero vector all have loss among the space voltage vector figure, only remaining two middle vectors, six small vectors and a zero vector can use, and six small vectors and zero vector surround orthohexagonal space voltage vector figure just, and this moment, fault phase was exported the O level state all the time.Because new polar plot is comprised of small vector and zero vector, so the polar plot profile is little during than normal condition, and inverter needs degraded running, but at this moment the amplitude of synthesized reference space voltage vector be under normal circumstances 1/2.
6. NPC three-level inverter fault redundance control method according to claim 1 is characterized in that, in the described step e, the principle that reselects effect vector and optimization vector sequence of operation is:
E1: during each diverter switch state, relate to few switching device of trying one's best;
E2: on the basis of principle E1, satisfy each switch periods as far as possible and all begin with Zero voltage vector, finish with Zero voltage vector again.
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