CN106125807A - Biobelt stagnant ring fault-tolerant control system at the SSMC of line computation switching logic and method - Google Patents

Biobelt stagnant ring fault-tolerant control system at the SSMC of line computation switching logic and method Download PDF

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Publication number
CN106125807A
CN106125807A CN201610539797.1A CN201610539797A CN106125807A CN 106125807 A CN106125807 A CN 106125807A CN 201610539797 A CN201610539797 A CN 201610539797A CN 106125807 A CN106125807 A CN 106125807A
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current
electric pressure
monolateral
electric
fault
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黄晓艳
王俊
方攸同
张何
李静
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Zhejiang University ZJU
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Zhejiang University ZJU
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • G05F1/561—Voltage to current converters

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

The invention discloses a kind of stagnant ring fault-tolerant control system of the biobelt at the SSMC of line computation switching logic and method.Gather the measured value of electric machine phase current, current error is obtained after it being compared with the reference value of predetermined current, compare with default current hysteresis annulus again, obtain four location comparison result parameters, current error derivation is obtained the symbol of its derivative, by symbol and four location comparison result parameters according to logic of propositions judgment mode, judge the electric pressure currently applied, corresponding relation according to electric pressure with switch opening and closing obtains current connecting valve, if switching tube breaks down, then by using standby voltage grade to avoid the switching tube broken down.The inventive method can realize the accurate control of electric current by more electric pressure, it is ensured that electric machine phase current is stable, and near predetermined current, fault tolerant control method can operate with failure, and the reliability of system, stability are high, can meet the high request application scenarios such as aviation.

Description

Biobelt stagnant ring fault-tolerant control system at the SSMC of line computation switching logic and method
Technical field
The present invention relates to a kind of fault tolerant control method, especially relate to the double of a kind of monolateral matrix converter (SSMC) Band (Double-Band) stagnant ring fault-tolerant control system and method.
Background technology
Monolateral matrix converter (Single Sided Matrix Converter, SSMC) is that a kind of novel matrix becomes Parallel operation, belongs to three-phase to multi-phase converter.Every array using 6 two-way switch compositions mutually so that outfan can with arbitrarily One input connection.Matrix converter is compared with conventional bridge converter, it is not necessary to DC energy storage electric capacity, and Applicable temperature scope is more Extensively, reliability is higher；But often need to switch more mutually, relatively costly.
Monolateral matrix converter is adapted in use to the motor that unidirectional current drives, such as brshless DC motor and switched reluctance machines Deng.It controls generally to use current hysteresis-band control mode.Conventional hysteresis control method thereof is monocycle control, only one of which bandwidth, Target is for control electric current in bandwidth range.
Biobelt (Double-Band) Hysteresis control is a kind of Hysteresis control having two stagnant annulus, and target is by electric current control Make in inner band.Just input is adjusted after electric current enters outer shroud, reduces current variation speeds.By the stagnant ring of biobelt Control, can effectively reduce switching frequency, optimize Hysteresis control effect.But traditional off-line tabulation, the control tabled look-up online Mode is very inconvenient, wastes time and energy during tabulation, and table stores and can take a large amount of memory space in controller, and if a certain switch Pipe breaks down cannot opening and closing, then whole system performance will be caused to decline to a great extent even and collapse.
Summary of the invention
In order to solve problem present in background technology, it is an object of the invention to provide a kind of at line computation switching logic The biobelt stagnant ring fault-tolerant control system of SSMC and method, can be in the higher applications of the reliability requirements such as aviation.
Technical scheme is as follows:
One, a kind of biobelt at the SSMC of line computation switching logic stagnant ring fault-tolerant control system, as shown in Figure 1:
Including Hysteresis Current module, Hysteresis Current module is by the reference value of predetermined current and electric machine phase current current period Obtaining current error e after measured value, then current error e and the current hysteresis annulus preset are compared, current hysteresis annulus includes Positive outer shroud, positive internal ring, negative internal ring and negative outer shroud, it is thus achieved that four location comparison result parameters using binary number representation, and with Time current error e carried out derivation obtain the symbol D of its derivative, by symbol D and four location comparisons knots of current error e derivative Really parameter is sent to electric pressure in real time and selects module；
Selecting module including electric pressure, electric pressure selection module is according to logic of propositions judgment mode, by current error e The input of the symbol D of derivative and four location comparison result parameters judges that obtaining current period needs to be applied to motor phase windings Electric pressure V, then electric pressure V is sent in real time switch gate signal generation module,
Including switch gate signal generation module, switch gate signal generation module is according to electric pressure V and monolateral matrixing The corresponding relation of switch opening and closing, the voltage sensor monolateral matrix converter input voltage signal collected and voltage etc. in device Level V produces corresponding switch gate signal, is sent to monolateral matrix converter, thus completes current hysteresis-band control.
System also includes fault-tolerant control module, and fault-tolerant control module is through switch fault detection module and monolateral matrix converter Outfan connect, fault-tolerant control module receives and is transmitted, by switch fault detection module, the detection signal of breakdown switch element of coming Selected module to produce electric pressure V that transmission comes with receiving by electric pressure, calculate according to alternative voltage selection mode and work as Two electric pressures that front electric pressure V is neighbouring, two electric pressures are respectively the first alternative electric pressure V ' and second alternative Electric pressure V ", it is separately sent to electric pressure and selects module.
Described breakdown switch element refers to the switch that cannot turn in monolateral matrix converter.
Two, a kind of biobelt at the SSMC of line computation switching logic stagnant ring fault tolerant control method, as shown in Figure 4:
1) under current period, gather the measured value of electric machine phase current, it is compared with the reference value of predetermined current and obtains afterwards To current error e, then current error e and the current hysteresis annulus preset are compared, current hysteresis annulus include positive outer shroud, positive internal ring, Negative internal ring and negative outer shroud, it is thus achieved that four location comparison result parameters using binary number representation, and current error e is entered simultaneously Row derivation obtains the symbol D of its derivative；
2) by the symbol D of current error e derivative and four location comparison result parameters according to logic of propositions judgment mode, sentence Disconnected obtain current period and need to be applied to electric pressure V of motor phase windings；
3) electric pressure V that need to apply is combined by the monolateral matrix converter input voltage signal collected, according to electricity The corresponding relation of switch opening and closing in pressure grade V and monolateral matrix converter, it is thus achieved that switch that current period need to connect also is applied to On monolateral matrix converter, and then the work controlling monolateral matrix converter runs, thus completes current hysteresis-band control.
Biobelt (Double-Band) control algolithm has two stagnant ring annulus, is divided into internal ring and outer shroud, the control of its outer-loop The common Hysteresis control of logical AND processed is identical, and the present invention is between inner and outer ring and internal ring arranges multiple electric pressure logic, passes through Electric current can preferably be controlled in stagnant annulus internal ring by these multiple electric pressures, reduces switching frequency, optimal control effect.
Monolateral matrix converter includes 6 switch elements mutually, at any one time, by controlling on off state, the present invention 7 kinds of different voltages can be applied: V+++, V++, V+, 0, V-, V--, V---, concrete table 4 below, table 1 can be in conjunction with to motor winding Fig. 2 reference.Wherein 0 voltage produces with when exporting mutually identical for input, such as AA, BB, CC.
Table 1
I II III IV V VI VII VIII IX X XI XII
V+++ VCB VAB VAB VAC VAC VBC VBC VBA VBA VCA VCA VCB
V++ VAB VCB VAC VAB VBC VAC VBA VBC VCA VBA VCB VCA
V+ VCA VAC VCB VBC VAB VBA VAC VCA VBC VCB VBA VAB
0 0 0 0 0 0 0 0 0 0 0 0 0
V- VAC VCA VBC VCB VBA VAB VCA VAC VCB VBC VAB VBA
V-- VBA VBC VCA VBA VCB VCA VAB VCB VAC VAB VBC VAC
V--- VBC VBA VBA VCA VCA VCB VCB VAB VAB VAC VAC VBC
Wherein, I～XII represents three-phase input power is divided into these 12 intervals of I～XII, seven electricity in each interval Press grade V as shown in Table, VCB、VAB、VCADeng each line voltage of expression.
Described electric pressure V has seven possible electric pressures, by voltage from the occasion of being up to negative value maximum respectively For V+++, V++, V+, 0, V-, V--and V---, its value takes-3 to+3, and described logic of propositions judgment mode uses below table 2 Represent:
Table 2
Wherein, symbol D be 0 expression current error e derivative be negative, symbol D be 1 expression current error e derivative be just or zero, Each location comparison result parameter is 0 or 1, and location comparison result parameter is 1 to be expressed as current error e more than or equal to predetermined current Circular current in stagnant annulus, location comparison result parameter is the 0 ring electricity being expressed as that current error e is less than in the stagnant annulus of predetermined current Stream.
U1, U2, U3 and U4 represent respectively positive outer shroud in current error e annulus stagnant with predetermined current respectively, positive internal ring, negative in Ring compare relatively with negative outer shroud after sign symbol, if current error e is more than or equal to the ring in the stagnant annulus of predetermined current, then U is 1, If current error e is less than the ring in the stagnant annulus of predetermined current, then U is 0.I.e.: when U1, U2, U3 and U4 value takes 1, represent electricity respectively Stream error e is more than or equal to positive outer shroud, more than or equal to positive internal ring, more than or equal to negative internal ring with more than or equal to negative outer shroud, U1, U2, U3 Represent when taking 0 with U4 value that current error e is less than positive outer shroud, less than positive internal ring, less than negative internal ring with less than negative outer shroud respectively.
Table 2 concrete example explanation expression situation: be such as 0, U1+U2+U3+U4=1 at symbol D, the voltage in a upper cycle Grade V is V++, according to table second row select be to compare a upper cycle elevated by one step, namely selection V+++ as this week Electric pressure V of phase；If symbol D is 0, U1+U2+U3+U4=2, electric pressure V in a upper cycle is V-, according to the 3rd of table the What row selected is to keep constant with a upper cycle, and namely selection V-is as electric pressure V in this cycle.
Motor of the present invention is attached to monolateral matrix converter outfan.
Described electric pressure V uses below equation table 3 to show with the corresponding relation of switch opening and closing in monolateral matrix converter:
Table 3
Wherein, M represents the sign symbol of mesophase Mid, and M=1 represents that mesophase Mid is just or zero, and M=0 represents middle Phase Mid is negative, and maximum phase Max, mesophase Mid and minimum phase Min represent three-phase dividing by voltage swing under current period respectively Class.
Table 3 concrete example explanation expression situation: if now M=1, electric pressure V to be applied is V+++, now Maximum phase Max be A phase, mesophase Mid be B phase, minimum phase Min be C phase, then 1,3, No. 5 switches in input i.e. Fig. 1 Tube side, should turn on the switching tube of corresponding maximum phase Max, namely No. 1 switching tube of A phase according to the first row；Outfan is the most just It is 2,4, No. 6 switch tube side in Fig. 1, the switching tube of corresponding minimum phase Min, namely No. 6 of C phase should be turned on according to the first row Switching tube.The present invention is that three-phase is respectively phase A, phase B and phase C by three-phase pointer in being embodied as, in the stagnant ring control of each cycle Three-phase voltage is detected, it is judged that maximum phase Max, mesophase Mid and minimum phase Min, then by maximum phase Max, mesophase time processed Mid, minimum phase Min assignment respectively are to corresponding phase.
Described alternative voltage selection mode uses below table 4 to represent:
Table 4
Wherein, V+++, V++, V+, 0, V-, V--and V---represent respectively from the occasion of be up to maximum seven of negative value may Electric pressure V.
Table 4 concrete example explanation expression situation: if electric pressure V to be applied is V---, but correspondence to be led Logical switching tube breaks down cannot opening and closing, then will use the first alternative electric pressure V ' namely V--, if correspondence to be led Logical switching tube does not has fault the most directly to turn on this switching tube, if correspondence switching tube to be turned on still exist fault without Method opening and closing, then use the second alternative electric pressure V " that is to say V-, the switching tube that conducting is corresponding.The biobelt of the present invention controls can Make full use of the feature that the electric pressure of monolateral matrix converter is more, choose suitable electric pressure, make phase current more preferable Stable in stagnant ring region, it is achieved to control purpose.
Ability properly functioning during for realizing power switch failed open, needs to add failure operation faults-tolerant control mode. In control method of the present invention, when a switch element cannot turn on, available electric pressure will be reduced to 5 by 7, if The electric pressure that controller finally selects is not among 5 voltage available grades, and this is without electromagnetic torque output will a moment, Cause bigger torque ripple.And if able to select an electric pressure proximate to it from 5 voltage available grades, will Torque ripple can be greatly reduced, automatically avoid breakdown switch element, it is achieved tape jam fault-tolerant operation, thus ensure that motor can To export stable electromagnetic torque.
Therefore, when calculating electric pressure V being currently needed for, calculate its two neighbouring electric pressures V simultaneously ' and V ". If electric pressure V produces fault feedback signal, then use the first alternative electric pressure V '；If the first alternative electric pressure V ' Still produce fault feedback signal, then use the second alternative electric pressure V ".Because the most only two electric pressures are invalid, institute With the second alternative electric pressure V " it is voltage available grade certainly, thus ensure system worked well.
Thus, present invention assumes that the switch that described current period need to connect produces event after being applied to monolateral matrix converter Barrier feedback signal, when obtaining monolateral matrix converter one breakdown switch element of existence by fault feedback signal, below employing Mode processes:
A) selected to obtain current voltage grade V by electric pressure V under current period according to alternative voltage selection mode adjacent Two near electric pressures, two electric pressures are respectively the first alternative electric pressure V ' and the second alternative electric pressure V "；
B) by by the first alternative electric pressure V ' switch that need to connect of current period that obtains according to corresponding relation is applied to Monolateral matrix converter, if still producing fault feedback signal, proceeds next step；If not producing fault feedback signal, Then do not continue to next step；
C) by by the second alternative electric pressure V " switch that need to connect of current period that obtains according to corresponding relation is applied to Monolateral matrix converter.
Visible, after voltage is divided into 7 grades by the present invention, preferential output optimal voltage grade, and the shape to switch element State detects in real time.When switch fault (disconnection) being detected, if this optimal voltage grade is relevant to breakdown switch, i.e. to lead Logical switching tube breaks down, and the electric pressure choosing neighbouring fault-free switch replaces carrying out electric current control, until to be turned on Till switching tube fault-free can turn on, thus reduce torque ripple, improve the reliability of system.
The invention has the beneficial effects as follows:
Biobelt control method of the present invention can realize the accurate control of electric current by more electric pressure, it is ensured that motor is mutually electric Stream is stable near predetermined current, and therefore control accuracy is higher；
Also having fault tolerant control method in control method of the present invention, can operate with failure, the reliability of system, stability are very Height, can meet the high request application scenarios such as aviation.
Accompanying drawing explanation
Fig. 1 is the embodiment of the present invention one mutually monolateral matrix converter structure chart.
Fig. 2 is that input voltage sector divides schematic diagram.
Fig. 3 is the Double-Band motor driven systems structure having faults-tolerant control.
Fig. 4 is Double-Band faults-tolerant control flow chart.
Fig. 5 is that electric pressure selects inside modules logic.
Fig. 6 is the simulation result under fault-free situation.
Fig. 7 is that motor A phase 1 pipe is faulty without the simulation result under faults-tolerant control.
Fig. 8 is that motor A phase 1 manages the faulty simulation result having under faults-tolerant control.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
The embodiment of the present invention and operation principle process thereof are as follows:
Embodiment chooses a three-phase brushless dc motor and control system illustrates.Control system is by speed controlling Device, current hysteresis-band control device, electric pressure selector, switching signal maker and power amplifier board composition, as shown in Figure 3.Speed control Device Negotiation speed sensor processed obtains the rotary speed measure value of motor, obtains the amplitude of reference current after treatment, further according to ginseng Examine rotating speed and obtain reference current frequency, thus obtain reference current waveform.Reference current waveform inputs after comparing with feedback current Current hysteresis-band control device.
The operation principle of current hysteresis-band control device is:
Preset two hysteresis bands, internal ring InnerBand and outer shroud OuterBand.Thus form 4 and compare threshold value + OuterBand ,+InnerBand ,-InnerBand and-OuterBand.Respectively current error e and 4 reference values are compared, If e is more than reference value, then by UiIt is set to 1, is otherwise provided as 0.Obtain U1,U2,U3,U4.And to e derivation, obtain it and lead The symbol D of number.The output of current hysteresis-band control device is i.e. D and U1,U2,U3,U4。
The operation principle of electric pressure selector is: according to D and U1,U2,U3,U4Value determine subsequent time voltage etc. Level.Work as U1,U2,U3,U4When being all zero, illustrating that electric machine phase current is too small, already below-OuterBand, phase current to be allowed returns to In annulus, need to apply ceiling voltage, i.e. V+++ to phase winding.And U1,U2,U3,U4When being all 1, illustrate that phase current is excessive, Through exceeding+OuterBand, electric current to be allowed returns in annulus, needs to apply negative voltage, i.e. V---to phase winding.Concrete U1, U2,U3,U4, D and V relation as shown in table 2.
The operation principle of switching signal maker is: first by ABC three phase mains pointer, and A phase is 1, and B phase is 2, C phase It is 3.By three comparators, ABC is ranked up according to descending order, and by corresponding pointer assignment to max, mid, Tri-output variables of min.The most again by a comparator, obtain the symbol M of mid voltage.There is data above, it is possible to will Electric pressure is corresponding with power supply, and corresponding relation is as shown in table 3.
By ABC three phase mains pointer, A phase is 1, and B phase is 2, and C phase is 3.The switching tube numbered 1 of the upper brachium pontis of A phase Namely 2A-1, lower brachium pontis switching tube numbered 2 namely 2A, in like manner, the biphase upper and lower brachium pontis switching tube of B, C all can so represent. Three-phase pointer has been assigned to max, mid and min respectively, then the upper and lower brachium pontis numbering of max, mid and min phase can also this Method representation, such as 2max-1,2max etc..
Such as it is now to export V+++, then needs to turn on upper brachium pontis and the lower brachium pontis of min phase of max phase, then by numbered The gate signal of the switching tube of 2max-1 and 2min puts 1, so operates, according to table 3 by defeated for gate signal corresponding for every kind of situation Go out write-in program.
As it is shown in figure 5, three phase mains can be divided into 12 intervals according to size, in each interval, corresponding max, mid Keep constant with min phase.As a example by the 1st interval, max phase place C, mid phase be A, min phase be B, i.e. max=3, mid=1, min =2.If now calculating through program and should exporting V+++, then 2max-1 and 2min switching tube gate signal should be put 1, namely make 5 Number switching tube and No. 4 switching tubes conductings, thus export V+++.
After some electronic power switch is because of overheated failed open such as grade, if in the gate signal of output, just to use This switch, will result in a certain moment motor phase windings open circuit.For solving this problem, add the module that operates with failure.First With the failure condition of all switches of sensor acquisition, feed back in switching signal maker；Simultaneously in electric pressure selector Not only to calculate the most optimal electric pressure, the electric pressure taking out two suboptimums according to nearby principle is standby.Opening OFF signal maker increases detection, if switching signal is identical with the switch that fault-signal indicates, then calls one of them standby By electric pressure, again detect conflict；If still conflicted, then call another standby voltage grade.By increasing backup electricity Pressure grade, it is ensured that the armature winding of motor is not opened a way, and reduces torque ripple as far as possible.Concrete standby voltage grade such as table 4 institute Show
Assume or need in the 1st interval to export V+++, but now No. 1 switching tube generation open fault cannot turn on, and needs Turn on No. 5 and No. 4 switching tubes, so directly the switching tube gate signal of No. 5 and No. 4 being put 1.If now No. 5 switching tubes There is open fault, then clash, it is impossible to normally export V+++, need to export standby voltage grade 1, namely V++, need 2mid-1 and 2min switching tube gate signal being put 1, namely to make No. 1 switching tube and No. 4 switching tube conductings, Lothrus apterus occurs, Export the most in this way.If No. 4 switching tube generation open faults cannot turn on, then rush during output V+++ Prominent, standby voltage 1V++ also can clash, then just output standby voltage 2V+, namely by 2max-1 and 2mid switching tube Gate signal puts 1, i.e. No. 5 and No. 2 switching tubes of conducting.
Fig. 6-8 be rotating speed be 2000r/min, nominal torque is the simulation result of the next situation of 10Nm operating mode.Clearly have When switching tube breaks down without faults-tolerant control, the control effect of electric current is more a lot of than deteriorating under normal circumstances, and after having faults-tolerant control, The control effect of electric current is basic with the most consistent, embodies the excellent effect of the tolerant fail algorithm of proposition.
Being divided into 7 grades by present invention voltage at any one time as can be seen here, biobelt Hysteresis control takes full advantage of Monolateral matrix converter can provide the feature of 7 electric pressures, when electric current is in annulus diverse location, chooses flexibly suitably Electric pressure, make current stabilization is maintained at cuff s internal.Owing to voltage available grade is more, when single switch breaks down, Control logic can be adjusted, choose neighbouring trouble-free electric pressure, thus improve system dependability, optimal control further Effect.

Claims (7)

1. the stagnant ring fault-tolerant control system of the biobelt at the SSMC of line computation switching logic, it is characterised in that: include current hysteresis Ring module, Hysteresis Current module obtains electricity after being compared by the measured value of the reference value of predetermined current with electric machine phase current current period Stream error e, then current error e and the current hysteresis annulus preset are compared, it is thus achieved that four position ratios using binary number representation Relatively result parameter, and current error e is carried out derivation simultaneously obtain the symbol D of its derivative, by the symbol D of current error e derivative It is sent to electric pressure in real time with four location comparison result parameters and selects module；
Selecting module including electric pressure, electric pressure selection module is according to logic of propositions judgment mode, by current error e derivative Symbol D and the input of four location comparison result parameters judge to obtain current period and need to be applied to the voltage of motor phase windings Grade V, then electric pressure V is sent in real time switch gate signal generation module,
Including switch gate signal generation module, switch gate signal generation module is according in electric pressure V and monolateral matrix converter The corresponding relation of switch opening and closing, voltage sensor the monolateral matrix converter input voltage signal collected and electric pressure V Produce corresponding switch gate signal, be sent to monolateral matrix converter, thus complete current hysteresis-band control.
A kind of biobelt at the SSMC of line computation switching logic the most according to claim 1 stagnant ring fault-tolerant control system, its Being characterised by: also include fault-tolerant control module, fault-tolerant control module receives the fault come by the transmission of switch fault detection module and opens Detection signal and the reception of closing element are produced by electric pressure selection module and transmit electric pressure V of coming, and select according to alternative voltage The mode of selecting calculates two neighbouring with current voltage grade V electric pressure, and two electric pressures are respectively the first alternative voltage Grade V ' and the second alternative electric pressure V ", it is separately sent to electric pressure and selects module.
3. the stagnant ring fault tolerant control method of the biobelt at the SSMC of line computation switching logic, it is characterised in that: at current period Under, gather the measured value of electric machine phase current, after it being compared with the reference value of predetermined current, obtain current error e, then by electric current Error e and the current hysteresis annulus preset compare, it is thus achieved that four location comparison result parameters using binary number representation, and simultaneously Current error e is carried out derivation and obtains the symbol D of its derivative；
By the symbol D of current error e derivative and four location comparison result parameters according to logic of propositions judgment mode, it is judged that obtain Current period needs to be applied to electric pressure V of motor phase windings；
Electric pressure V that need to apply is combined, according to electric pressure V by the monolateral matrix converter input voltage signal collected With the corresponding relation switching opening and closing in monolateral matrix converter, it is thus achieved that switch that current period need to connect also is applied to monolateral matrix On changer, and then the work controlling monolateral matrix converter runs, thus completes current hysteresis-band control.
A kind of biobelt at the SSMC of line computation switching logic the most according to claim 3 stagnant ring fault tolerant control method, its It is characterised by:
The switch that current period described in assuming need to connect produces fault feedback signal after being applied to monolateral matrix converter, passes through When fault feedback signal obtains monolateral matrix converter one breakdown switch element of existence, process in the following ways:
A) selected to obtain current voltage grade V by electric pressure V under current period according to alternative voltage selection mode neighbouring Two electric pressures, two electric pressures are respectively the first alternative electric pressure V ' and the second alternative electric pressure V "；
B) by by the first alternative electric pressure V ' switch that need to connect of current period that obtains according to corresponding relation is applied to monolateral Matrix converter, if still producing fault feedback signal, proceeds next step；If not producing fault feedback signal, the most not It is further continued for next step；
C) by by the second alternative electric pressure V " switch that need to connect of current period that obtains according to corresponding relation is applied to monolateral Matrix converter.
Control method described in control system the most according to claim 1 and 2 or claim 3 or 4, its feature exists In:
Described electric pressure V has seven possible electric pressures, by voltage from being respectively V++ on the occasion of being up to negative value maximum +, V++, V+, 0, V-, V--and V---, described logic of propositions judgment mode uses below table to represent:
Wherein, symbol D be 0 expression current error e derivative be negative, symbol D be 1 expression current error e derivative be just or zero, each Location comparison result parameter is 0 or 1, and location comparison result parameter is 1 to be expressed as current error e more than or equal to the stagnant ring of predetermined current Circular current in band, location comparison result parameter is 0 circular current being expressed as that current error e is less than in the stagnant annulus of predetermined current.
Control method described in control system the most according to claim 1 and 2 or claim 3 or 4, its feature exists In: described electric pressure V uses below equation to represent with the corresponding relation of switch opening and closing in monolateral matrix converter:
Wherein, M represents the sign symbol of mesophase Mid, and M=1 represents that mesophase Mid is just or zero, and M=0 represents mesophase Mid Being negative, maximum phase Max, mesophase Mid and minimum phase Min represent that under current period, three-phase is by the classification of voltage swing respectively.
Control method described in control system the most according to claim 1 and 2 or claim 3 or 4, its feature exists In: described alternative voltage selection mode uses below table to represent:
Wherein, V+++, V++, V+, 0, V-, V--and V---represent respectively from the occasion of being up to seven possible electricity that negative value is maximum Pressure grade V.
CN201610539797.1A 2016-07-06 2016-07-06 Biobelt stagnant ring fault-tolerant control system at the SSMC of line computation switching logic and method Pending CN106125807A (en)

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