CN100372201C - Matrix type converter fault protecting method and circuit for supporting fault-tolerant operation - Google Patents

Matrix type converter fault protecting method and circuit for supporting fault-tolerant operation Download PDF

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CN100372201C
CN100372201C CNB2005100867506A CN200510086750A CN100372201C CN 100372201 C CN100372201 C CN 100372201C CN B2005100867506 A CNB2005100867506 A CN B2005100867506A CN 200510086750 A CN200510086750 A CN 200510086750A CN 100372201 C CN100372201 C CN 100372201C
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motor
fault
circuit
matrix converter
current
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CNB2005100867506A
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CN1773802A (en
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王莉娜
黄立培
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清华大学
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Abstract

The present invention relates to a matrix type converter fault protecting method and a circuit for supporting fault-tolerant operation, which belongs to the technical field of AC electrical energy conversion. Aiming at the defects of a diode-bridge clamping circuit protecting mode commonly used by a matrix type converter, the present invention provides the matrix type converter fault protecting method and the circuit for supporting fault-tolerant operation. When faults occur, a controllable continuous current circuit is provided for a motor by controlling the main circuit switch of the matrix type converter or recombining a system structure to make the motor quickly release energy to stop or carry out fault-tolerant operation according to a situation. When the matrix type converter fault protecting method and the circuit are adopted, the fault situations that the motor is overloaded, a certain switch of the main circuit of the matrix type converter is broken, short-circuit occurs to a certain switch of the main circuit of the matrix type converter, etc., are effective eliminated, and the abuses of the traditional diode clamping protecting circuit are overcome. By adopting the fault-tolerant operation control provided by the present invention, the motor can maintain the operation when the speed of the motor is close to the rated rotation speed. Although the lasting operation can not be maintained, the fault-tolerant operation control still is an economic and effective emergency mode.

Description

Support the matrix converter fault protecting method and the circuit of fault-tolerant operation

Technical field

The present invention relates to the fault protecting method and the circuit of matrix converter, belong to AC energy converter technique field.

Background technology

As shown in Figure 1, matrix converter 101 is direct transformation of electrical energy devices of a kind of AC-AC, is made of 9 bidirectional switchs, does not have electric capacity DC link broad in the middle.9 bidirectional switchs are exported with 3 * 3 matrix form connection three-phase input and three-phase, so be named matrix converter.Wherein bidirectional switch 102 is made up of insulated gate bipolar transistor (IGBT) company of playing a reversed role of two band fast recovery diodes, and two IGBT common emitters commonly used connect, and also available certainly common collector connects.Break-make control by to 9 bidirectional switchs in the matrix converter can realize the output voltage that amplitude and frequency are all variable, thereby drives the alternating current machine operation.The mains side of matrix converter is connected to low pass filter 100, is made up of inductance L f, capacitor C f, resistance R d, is used for suppressing the switch burr of matrix converter input current, thereby makes power supply avoid the interference of high-frequency harmonic.Because the switching frequency often very high (often greater than 15kHz) of matrix converter, so little inductance, electric capacity just can play good filter effect.Resistance R d plays the resonance inhibitory action.

The design feature of matrix converter makes its AC-DC-AC code converter than routine, have many advantages, as: do not need capacitance energy storage link broad in the middle, compact conformation, life cycle and environment for use are not subjected to the easily restriction of aging electrochemical capacitor, and matrix converter can realize that energy two-way circulates, the input and output current sinusoidal, functions such as (comprising unity power factor) that input power factor is adjustable, make it be fit to very much be applied to steamer, vehicle, aviations etc. are to device volume, the occasion that weight is had relatively high expectations, temperature, the more high bad working environment of humidity, the mine operation car, crane, elevator, centrifuges etc. need continuously the electronic occasion of continuous brake power generating again, Alcohol Plant, needs such as chemical plant braking but the occasion of brake resistance can't be installed, and the application scenario of low harmonic requirement etc.Matrix converter is just becoming transformation of electrical energy, motor frequency conversion drives one of focus of area research.

Yet the structural advantage of matrix converter has simultaneously also brought difficult point on the error protection to it; be that it does not have free continuous current circuit; this makes its overcurrent, overvoltage protection very thorny; can not follow the way in the conventional AC-DC-AC code converter, fix a breakdown by the switch that disconnects all matrix converters simply.Because motor is an inductive load, because inductive effect, the unexpected interruption of current of electric can cause strong back-emf, jeopardizes the safety of matrix converter switch.The protection problem of matrix converter was once once blocking its flow of research; up to nineteen eighty-two, the Neft of U.S.'s Westinghouse Electrical Corp. has proposed diode bridge clamping circuit (United States Patent (USP) 4,497; 230) protected mode, the research of matrix converter are just continued deeply.

Matrix converter adopts the system of diode bridge clamping circuit protected mode to form as shown in Figure 2.Among the figure, diode bridge clamping circuit 103 is made up of two covers, 6 pulse diode three-phase bridge, and wherein a cover is connected in parallel on the input of matrix converter, the another set of output that is connected in parallel on matrix converter, and their DC side connects by a public direct-current electric capacity.With the resistance of electric capacity parallel connection, be used for providing an energy to discharge the loop to electric capacity.This resistance can not be too little, otherwise energy consumption will be too big, simultaneously also with the power supply quality of influence matrix formula converter.

The potential diode continuousing flow loop of the working mechanism of diode bridge clamping circuit and conventional AC-DC-AC code converter is identical, when the input side of matrix converter or outlet side voltage surpass the clamping circuit capacitance voltage, the conducting immediately of the diode of respective side is limited in the terminal voltage of matrix converter the level of clamping circuit capacitance voltage.Thereby, when overcurrent appears in matrix converter-electric system, can disconnect all converter switches, and need not worry the strong back-emf that inductive effect produces as conventional AC-DC-AC code converter.Clamping circuit electric capacity will absorb the electromagnetic energy that stores in the motor windings.

The advantage of diode bridge clamping circuit protected mode is simple, rapid, effective, to being still the most normal a kind of protected mode of quoting in the document at present.Its shortcoming is that it is equivalent to add the potential diode continuousing flow loop of conventional AC-DC-AC code converter in the matrix converter loop, though it is big that the requirement of the capacitance here can not show a candle to the capacity requirement of conventional AC-DC-AC code converter dc bus capacitor, but its capacity should be able to be enough to all absorb energy stored in the three phase electric machine winding, can not surpass the withstand voltage level of matrix converter switch and guarantee to boost.Therefore, when the electromagnetic energy upper limit of motor windings storage was higher, the capacity requirement of clamping circuit electric capacity was also bigger.The advantage that the introducing of big electric capacity makes matrix converter surmount conventional AC-DC-AC code converter is inevitably had a greatly reduced quality, thereby loses its part competitive advantage.In addition, clamping circuit electric capacity needs a cover pre-charge circuit, otherwise when system inserts electrical network, 2~3 times of overvoltage to line voltage can occur, and be attended by very strong rush of current, thus the anti-stream requirement that increases the clamping circuit diode.Along with matrix converter is used improving constantly of capacity requirement, the shortcoming of diode bridge clamping circuit protected mode comes out more and more.So be necessary very much to study the protected mode that is more suitable for matrix converter.

In addition, in some application scenario, the electrical fault shutdown can cause the occasion of serious accident or life danger, and as elevator, crane, Aero-Space, military equipment, mine steel rolling etc., the fault-tolerant operation of short time is very important.There is limited evidence currently of has document to relate to the research of matrix converter drive motors System Fault Tolerance operational mode.

Summary of the invention

The present invention is directed to the weak point of matrix converter diode bridge clamping circuit protected mode commonly used, proposed a kind of matrix converter fault protecting method and circuit of supporting fault-tolerant operation.

Key technology of the present invention is when faults such as matrix converter electric system generation motor overload, a certain matrix converter switch open circuit, the short circuit of a certain matrix converter switch, switch by gating matrix formula inverter main circuit, or it is auxiliary with the structural rearrangement technology, for motor provides a controlled continuous current circuit, make the motor emergency that releases energy rapidly, or according to circumstances carry out fault-tolerant operation.

Technical scheme of the present invention is as follows:

The matrix converter fault protecting method of support fault-tolerant operation of the present invention; increased by three and connect the threephase stator of motor and the fast bi-directional switch of input filter electric capacity neutral point N respectively in matrix converter-electric system, concrete controlled step is as follows:

When breaking down, block described matrix converter main circuit fault and go up all switch drive mutually, the fast bi-directional switch conducting that control is simultaneously gone up mutually with the joining motor stator of this fault, thus make this motor stator fast bi-directional switch that communicated be connected in the neutral point N of input filter electric capacity; At this moment, the control of the switch that the non-fault of described matrix converter main circuit is gone up mutually if keep the control mode before the fault constant, then can make the motor fault-tolerant operation;

If adopt following control mode, then can make the motor parking that releases energy rapidly:

According to current of electric direction and sector, matrix converter main circuit input voltage place, gating matrix formula inverter main circuit switch, for motor provides a controlled continuous current circuit, the selection principle of continuous current circuit is that Control current is that positive motor stator links and receives the power supply phase with negative maximum voltage value; Control current is received the power supply phase with positive maximum voltage value for negative motor stator links; When current of electric was zero, on off state remained unchanged; Wherein, the current direction motor is for just, and outflow motor is for negative;

When motor speed dropped to n≤ε, the driving pulse of all switches of blocking matrix formula inverter main circuit was finished parking; Wherein n is a motor speed, and ε is a little positive number, and the value of ε is adjusted according to concrete motor off-line; If before motor speed drops to n≤ε, variation has taken place in current of electric direction or sector, matrix converter three-phase input voltage place, carries out change of current control so, and the motor continuous current circuit is still selected by mentioned above principle.

The present invention also provides a kind of matrix converter fault secure circuit of support fault-tolerant operation of said method, it is characterized in that, described fault secure circuit comprises:

One end is connected in the leading-out terminal of motor A phase stator winding, and the other end is connected in the fast bi-directional switch Sa on the neutral point N of input filter electric capacity; One end is connected in the leading-out terminal of motor B phase stator winding, and the other end is connected in the fast bi-directional switch Sb on the neutral point N of input filter electric capacity; One end is connected in the leading-out terminal of motor C phase stator winding, and the other end is connected in the fast bi-directional switch Sc on the neutral point N of input filter electric capacity;

Be attempted by three piezo-resistances of the three-phase input end of matrix converter with the form of △, be attempted by three piezo-resistances of the three-phase output end of matrix converter with the form of △; And

Coupled in series is at nine fast acting fuses of the power inleting terminal of nine bidirectional switchs of matrix converter main circuit respectively.

Advantage of the present invention is to get rid of overvoltage or overcurrent fault effectively, and the matrix converter that can not detract surmounts the advantage of conventional AC-DC-AC code converter, has solved the drawback of classical matrix formula converter diode bridge clamping circuit protected mode.And the matrix converter fault secure circuit that the present invention proposes supports fault-tolerant operation, after the Fault Isolation, motor kept on the go approaching rated speed, and do not have to accomplish this point in the existing existing guard method.

Description of drawings

Fig. 1 is the basic composition block diagram of existing matrix converter-electric system.

Fig. 2 is the composition frame chart of the matrix converter-electric system of existing employing diode bridge clamping circuit protected mode.

Fig. 3 is the composition frame chart that contains the matrix converter-electric system of fault secure circuit of the present invention.

Fig. 4 is the distribution map of matrix converter input voltage sector.

Fig. 5 is the flow chart of controllable afterflow circuit controls program.

Fig. 6 is that the matrix converter main circuit diagram that is connected on the motor C phase stator (is supposed switch S Ca -Open circuit fault).

After Fig. 7 is structural rearrangement, the equivalent electric connection figure of matrix converter-electric system.

Fig. 8 is a switch S Ca -During short trouble, potential power supply short circuit loop schematic diagram.

Embodiment

Further specify the present invention below in conjunction with accompanying drawing and example.

The present invention proposes a kind of matrix converter fault secure circuit of supporting fault-tolerant operation, as shown in Figure 3, the present invention has added following hardware on the basic composition of matrix converter-electric system:

1. 3 fast bi-directional switch Sa, Sb, Sc.The end of fast bi-directional switch Sa is connected in the leading-out terminal of motor A phase stator winding, and the other end is connected on the neutral point N of input filter electric capacity; The end of fast bi-directional switch Sb is connected in the leading-out terminal of motor B phase stator winding, and the other end is connected on the neutral point N of input filter electric capacity; The end of fast bi-directional switch Sc is connected in the leading-out terminal of motor C phase stator winding, and the other end is connected on the neutral point N of input filter electric capacity.Fast bi-directional switch can be realized by quick bidirectional triode thyristor, also can be made up by 2 fast controllable silicon or IGBT and realize.Their purposes is: for fault phase current of electric provides continuous current circuit.

2. 6 piezo-resistance Z1~Z6.Piezo-resistance Z1, Z2, Z3 are attempted by the three-phase input end of matrix converter with the form of △, in order to suppress the overvoltage that mains side produces; Piezo-resistance Z4, Z5, Z6 are attempted by the three-phase output end of matrix converter with the form of △, in order to suppress the overvoltage that motor produces.The type selecting of piezo-resistance Z1~Z6 should be the fast device of reaction time less than 1ns.

3. 9 fast acting fuses (are called for short: fast melting) F1~F9.Their difference coupled in series are at the power inleting terminal of 9 bidirectional switchs of matrix converter main circuit.Their effect is: when two switches of matrix converter cause power supply short circuit, in order to quick excision short circuit current.Fast molten type selecting should guarantee when electric current during greater than the short circuit current threshold value, soon the I that melts 2T is less than the I of matrix converter main circuit switch 2T.

The present invention monitors the collector current of three phase electric machine electric current, 18 IGBT of matrix converter main circuit and collects voltage V between emitter-base bandgap grading by real-time CE, and in conjunction with the drive signal of 18 IGBT, Fault Isolation is carried out in analysis-by-synthesis and failure judgement type and fault point, and according to circumstances takes suitable troubleshooting strategy.Be the matrix converter fault protecting method that example illustrates support fault-tolerant operation of the present invention with three kinds of faults below.

(1) motor overload protection

When current of electric continue two cycles surpass its rated current 110% the time, promptly think motor overload taken place.When the motor overload fault took place, controller gating matrix formula inverter main circuit switch immediately made the motor parking that releases energy rapidly for motor provides controlled continuous current circuit.Because when selecting matrix converter main circuit switch device for use, generally all leave certain allowance, the motor overload electric current is general still within the range of safety operation of matrix converter main circuit switch, the all switches of matrix converter main circuit can be used for to motor provides controlled continuous current circuit, and the selection principle of continuous current circuit is: Control current is that positive motor stator links and receives the power supply phase with negative maximum voltage value; Control current is received the power supply phase with positive maximum voltage value for negative motor stator links; When current of electric was zero, on off state remained unchanged.Wherein, the current direction motor is for just, and outflow motor is for negative.

Illustrate below.When supposing over current of motor, the direction of motor three-phase current is respectively: i a<0, i b>0, i c>0; The matrix converter input voltage is in the I1 sector, as shown in Figure 4, this moment a phase voltage u aBe positive maximum, b phase voltage u bBe negative maximum.In order to make the motor parking that releases energy rapidly, control motor A phase stator links with power supply a, motor B stator links with power supply b mutually, stator and power supply b's motor C link mutually.Before, supply voltage has entered the I2 sector if drop to n≤ε (n is a motor speed, and ε is a little positive number, and the value of ε is adjusted according to concrete motor off-line) at motor speed, at this moment a phase voltage u aBe positive maximum, c phase voltage u cBe negative maximum, carry out change of current control so, change continuous current circuit, the change of current of motor B phase stator is gone up mutually to power supply c, the change of current of motor C phase stator is gone up mutually to power supply c, and motor A phase stator still is connected on power supply a and remains unchanged on mutually.If before motor speed drops to n≤ε, variation has taken place in the current of electric direction, then also will change continuous current circuit, and the selection principle of continuous current circuit still as above.When motor speed dropped to n≤ε, energy stored discharged and finishes in the motor windings, and disconnect all matrix converter switches this moment, finishes parking, and any overvoltage phenomenon can not occur.Above-mentioned control program flow chart as shown in Figure 5.In experimentation, can obviously observe motor speed and reduce rapidly, much rapider than direct outage parking mode.

Table 1 has been summarized the continuous current circuit situation that the matrix converter input voltage should be selected during at different directions at different sectors and current of electric.As shown in Table 1, the selection of continuous current circuit needs two kinds of dependent variables, and a kind of is sector, matrix converter input voltage place, and another kind is the direction of current of electric.And original matrix converter-electric system controller has been provided with the detection and the detection of three phase electric machine sense of current of three-phase input voltage, so can directly use these variable informations.

The selection of table 1 continuous current circuit

Matrix converter input voltage sector Current of electric direction situation The continuous current circuit that should select (output-input) ??I-2,II-1 ??i A>0 ??A-c ??i A<0 ??A-a ??i B>0 ??B-c ??i B<0 ??B-a ??i C>0 ??C-c ??i C<0 ??C-a ??II-2,III-1 ??i A>0 ??A-c ??i A<0 ??A-b ??i B>0 ??B-c ??i B<0 ??B-b ??i C>0 ??C-c ??i C<0 ??C-b ??III-2,IV-1 ??i A>0 ??A-a ??i A<0 ??A-b ??i B>0 ??B-a ??i B<0 ??B-b ??i C>0 ??C-a ??i C<0 ??C-b ??IV-2,V-1 ??i A>0 ??A-a ??i A<0 ??A-c ??i B>0 ??B-a ??i B<0 ??B-c ??i C>0 ??C-a ??i C<0 ??C-c ??V-2,VI-1 ??i A>0 ??A-b ??i A<0 ??A-c ??i B>0 ??B-b ??i B<0 ??B-c

??i C>0 ??C-b ??i C<0 ??C-c ??VI-2,I-1 ??i A>0 ??A-b ??i A<0 ??A-a ??i B>0 ??B-b ??i B<0 ??B-a ??i C>0 ??C-b ??i C<0 ??C-a

Under the motor overload situation, gating matrix formula inverter main circuit switch provides controlled continuous current circuit for motor immediately, make the motor parking that releases energy rapidly, continuous current circuit is realized by the matrix converter main circuit switch fully, if control well, can not enable piezo-resistance, molten and fast bi-directional switch soon.And this parking mode that releases energy also can be used for the orderly closedown of matrix converter-electric system fully, and advantage is: directly power-down mode is rapid for cut-off velocity on the one hand, the electromagnetic energy that motor windings stores can be fed back to electrical network on the other hand.

(2) protection and the fault-tolerant operation during a certain switch open circuit fault of matrix converter main circuit

If switching drive signal be effective, switching current much smaller than current of electric, and voltage V between switch collection emitter-base bandgap grading CESubstantially exceed normally voltage, then think the switch open circuit fault has taken place.When detecting a certain switch open circuit fault, controller is controlled the fast bi-directional switch conducting that has the motor stator of connection to go up mutually with this breakdown switch immediately, simultaneously the driving pulse of all switches of going up mutually of blocking matrix formula inverter main circuit breakdown switch place.And control by the switch that the non-fault of matrix converter main circuit is gone up mutually, can realize making motor to release energy rapidly stopping or carry out fault-tolerant operation.

Illustrate below.As shown in Figure 6, suppose switch S Ca -Open circuit fault has taken place, and working as motor C phase current so needs the change of current to arrive S Ca -During branch road, opening circuit suddenly of C phase current will occur, because inductive effect, the unexpected disconnection of current of electric will inevitably produce strong back-emf in stator terminal.In case the hardware observation circuit detects the switch open circuit fault, control immediately is connected in the fast bi-directional switch S that C goes up mutually cThe drive signal that C goes up all matrix converter main circuit switches is mutually blocked in conducting simultaneously.Motor C passes through S mutually cBe connected to the neutral point N of input filter capacitor, the C phase current obtains afterflow.The equivalence of system connects as shown in Figure 7 after the structural rearrangement.

And the control mode of the switch that the non-fault of matrix converter main circuit is gone up mutually if remain unchanged, promptly keeps the control mode before the fault constant, still does the sine control of 120 ° of phase place mutual deviations, then can make motor carry out fault-tolerant operation near maintaining rated speed; If the switch that the non-fault motor of matrix converter main circuit is gone up mutually adopts the principle of above-mentioned selection continuous current circuit to control, be that Control current is that positive motor stator links and receives the power supply phase with negative maximum voltage value, Control current is received the power supply phase with positive maximum voltage value for negative motor stator links, when current of electric is zero, on off state remains unchanged, motor is released energy rapidly, current of electric drops to rapidly and approaches 0, the motor electromagnetic torque drops to 0 rapidly, and motor speed also descends rapidly.When motor speed dropped to n≤ε, motor power discharged and finishes, and disconnect all matrix converter switches this moment, and fast bi-directional switch S c, to realize stopping, the strong back-emf of any danger can not appear.

After adopting said method, input filter electric capacity neutral point voltage V NTo depart from the current potential at zero point, and change along with the variation of motor set end voltage, excursion and supply voltage are on an order of magnitude, and the requirement of withstand voltage of this explanation fast bi-directional switch Sa, Sb, Sc and matrix converter main circuit switch are in same level.The drift of filter capacity neutral point voltage is also little to the influence of matrix converter input voltage, and is therefore also little to the influence of matrix converter one electric system control.The filter capacity parameter can influence input filter neutral current i NSize, electric capacity is big more, the influence that the matrix converter input voltage is subjected to is more little, filter neutral current i NBig more.But generally speaking, i NWith current of electric on an order of magnitude, the anti-stream of this explanation fast bi-directional switch Sa, Sb, Sc require also with the matrix converter main circuit switch in same level.Therefore, fast bi-directional switch Sa, Sb, Sc can adopt the bidirectional switch identical with the matrix converter main circuit.Because fast bi-directional switch Sa, Sb, Sc do not need to be operated on off state, and be not high to the rate request of switch, so fast bi-directional switch also can adopt quick bidirectional triode thyristor or made up by 2 fast controllable silicon and to realize.

Malfunction monitoring, control fast bi-directional switch S iConducting (wherein i=a or b or c), and the blockade of matrix converter main circuit respective switch drive signal is all realized by hardware circuit, the control time-delay of whole process generally only is several microseconds at zero point only for the time-delay of opening of analog circuit signal transmission delay and fast bi-directional switch.In this process, the buffer circuit of matrix converter main circuit IGBT can have the good restraining effect to the overvoltage that causes because of inductive effect, and under serious situation, the piezo-resistance Z4~Z6 that is attempted by the matrix converter outlet side will play a role.

(3) a certain switch short trouble protection of matrix converter main circuit and fault-tolerant operation

If the change of current of matrix converter switch room is controlled well, the short trouble of switch generally can not take place.But the safety of power electronic equipment must be considered the short trouble situation of switch.If switching current substantially exceeds current of electric, and voltage surpasses normally voltage between switch collection emitter-base bandgap grading, then thinks the switch short trouble has taken place.

Illustrate below.As shown in Figure 8, suppose switch S Ca -Be short-circuited, so S Cb +-D 4-S Ca --D 1The short circuit of b-a two-phase, S will be caused Cc +-D 6-S Ca --D 1The short circuit of c-a two-phase will be caused.Because short-circuit impedance is very little, even very little voltage also very large short circuit current will occur.In a single day the hardware observation circuit detects big electric current, carry out controlled shutoff with immediately fault being gone up all matrix converter main circuit IGBT mutually, if electric current continue to increase surpasses the short circuit current threshold of IGBT, hardware circuit is all the switch drive pulses on the blocking matrix formula inverter main circuit fault phase (being the C phase in the example) immediately.If fast molten (being F9 in the example) on the short trouble switching branches is blown, so motor C mutually will with isolated from power, motor C opens circuit mutually, the situation as the switch open circuit fault occurs.After analog circuit detected open circuit fault, troubleshooting situation and a certain switch open circuit fault of matrix converter main circuit situation were similar, can be with reference to the related content in above-mentioned " a certain switch open circuit fault protection of matrix converter main circuit and fault-tolerant operation ".

But such two kinds of situations also may occur: 1. before fast molten F9 blew, fault went up the main circuit switch drive signal mutually and is blocked; 2. molten soon F7 or F8 are prior to the F9 scorification.Both of these case all will excise short trouble, and short circuit current disappears, but short trouble is not got rid of from system.So, motor C will be fixedly connected on power supply a mutually and go up mutually, if this moment, the current of electric direction was negative (flowing to power supply from motor), electric current is by the switch S of short circuit Ca -Afterflow current interruptions can not occur, and hardware circuit detects less than open circuit fault, S cCan conducting yet; If this moment, the current of electric direction was for just, electric current will interrupt, and observation circuit one detects open circuit fault, just controls S immediately cConducting.Will occur motor C so and pass through S mutually on the one hand cBe connected the neutral point of input filter, one side is by the switch S of short circuit Ca -Be connected power supply a and go up mutually, promptly a phase power supply short circuit is on the neutral point N of input filter electric capacity.Find that in emulation serious overcurrent and overvoltage phenomenon can not appear in both of these case.

Claims (2)

1. support the matrix converter fault protecting method of fault-tolerant operation; it is characterized in that; described method has increased by three and has connected the threephase stator of motor and the fast bi-directional switch of input filter electric capacity neutral point N respectively in matrix converter-electric system, concrete controlled step is as follows:
Motor overload, a certain switch of matrix converter main circuit open circuit when taking place, during a certain switch short trouble of matrix converter main circuit, block described matrix converter main circuit fault and go up all switch drive mutually, the fast bi-directional switch conducting that control is simultaneously gone up mutually with the joining motor stator of this fault, thus make this motor stator fast bi-directional switch that communicated be connected in the neutral point N of input filter electric capacity; At this moment, the control of the switch that the non-fault of described matrix converter main circuit is gone up mutually if keep the control mode before the fault constant, then can make the motor fault-tolerant operation, but not be suitable for the motor overload fault;
If adopt following control mode, then can make the motor parking that releases energy rapidly:
According to current of electric direction and sector, matrix converter main circuit input voltage place, gating matrix formula inverter main circuit switch, for motor provides a controlled continuous current circuit, the selection principle of continuous current circuit is that Control current is that positive motor stator links and receives the power supply phase with negative maximum voltage value; Control current is received the power supply phase with positive maximum voltage value for negative motor stator links; When current of electric was zero, on off state remained unchanged; Wherein, the current direction motor is for just, and outflow motor is for negative;
When motor speed dropped to n≤ε, the driving pulse of all switches of blocking matrix formula inverter main circuit was finished parking; Wherein n is a motor speed, and ε is a little positive number, and the value of ε is adjusted according to concrete motor off-line; If before motor speed drops to n≤ε, variation has taken place in current of electric direction or sector, matrix converter three-phase input voltage place, carries out change of current control so, and the motor continuous current circuit is still selected by mentioned above principle.
2. matrix converter fault secure circuit of realizing the support fault-tolerant operation of the described method of claim 1 is characterized in that described fault secure circuit comprises:
One end is connected in the leading-out terminal of motor A phase stator winding, and the other end is connected in the fast bi-directional switch Sa on the neutral point N of input filter electric capacity; One end is connected in the leading-out terminal of motor B phase stator winding, and the other end is connected in the fast bi-directional switch Sb on the neutral point N of input filter electric capacity; One end is connected in the leading-out terminal of motor C phase stator winding, and the other end is connected in the fast bi-directional switch Sc on the neutral point N of input filter electric capacity;
Be attempted by three piezo-resistances of the three-phase input end of matrix converter with the form of Δ, be attempted by three piezo-resistances of the three-phase output end of matrix converter with the form of △; And
Coupled in series is at nine fast acting fuses of the power inleting terminal of nine bidirectional switchs of matrix converter main circuit respectively.
CNB2005100867506A 2005-11-01 2005-11-01 Matrix type converter fault protecting method and circuit for supporting fault-tolerant operation CN100372201C (en)

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CN101839957B (en) * 2010-05-08 2011-12-07 中国矿业大学 Method for diagnosing main circuit fault of power converter of switched reluctance motor
CN103311903B (en) * 2012-03-08 2016-05-04 台达电子工业股份有限公司 A kind of switching device and electricity generation system thereof
CN103956912B (en) * 2014-05-15 2016-08-17 西安利雅得电气股份有限公司 A kind of directly series connection three-phase matrix form medium-high voltage frequency converter

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