CN201167289Y - Control device for matrix transducer - Google Patents
Control device for matrix transducer Download PDFInfo
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- CN201167289Y CN201167289Y CNU2007200882375U CN200720088237U CN201167289Y CN 201167289 Y CN201167289 Y CN 201167289Y CN U2007200882375 U CNU2007200882375 U CN U2007200882375U CN 200720088237 U CN200720088237 U CN 200720088237U CN 201167289 Y CN201167289 Y CN 201167289Y
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Abstract
The utility model relates to a control device for a matrix commutator, belonging to the matrix converter control techniques. The device comprises a trigger-driving circuit, an over-current protection circuit, a synchronous signal detection circuit, a voltage region partitioning unit, an on-off state control unit, and a commutation control unit. The commutation is conducted by the steps of: dividing an input phase voltage into a main region and a transition region, defining new states of P-phase, M-phase and N-phase and new transient states of PM, NP and MN in the transition region, selecting a specific zero-vector in each modulation period, and adjusting the state combination sequence of a two-way power switch. The device is based on transition region voltage-type two-step commutation strategy and needs not to be equipped with a dedicated measuring device for accurately measuring the relative magnitude relationship of the input phase voltage, so as to solve the short-circuit problem of the input phase voltage due to inaccurate measurement during region changing, without influencing on the output voltage waveform and the input current waveform.
Description
Technical field
The utility model belongs to the matrix converter control technology, is specifically related to a kind of control device that is used for matrix converter.This matrix converter has nine two-way power switch arranging by 3 * 3 switch matrix forms, and its two-way power switch is made up of the semiconductor switch of two differential concatenations respectively.
Background technology
Matrix converter is a kind of direct converter that does not have intermediate loop.By two-way power switch being arranged in the form of 3 * 3 switch matrix, each of three output phases of matrix converter can be connected with an input respectively mutually, and each output is connected with three inputs respectively by three two-way power switch.By controlling each two-way power switch, given interchange input can be directly changed into the output that exchanges of different voltages and different frequency, and can obtain sine-shaped power network current.
Fig. 1 shows in detail the topology diagram of three-phase matrix converter.Three-phase matrix converter 1 is made of by 3 * 3 switch matrix forms nine two-way power switch 2, can make output phase A by controlling nine two-way power switch 2, B, and the input of C and any one expectation is a mutually, b, c directly connects.Each output phase A of matrix converter or B or C import a by three two-way power switch 2 and three-phase, b, and c is connected, and is called 3 * 1 structures 3.
In matrix converter, two-way power switch is made of the semiconductor switch of two differential concatenations.In, in the small-power matrix converter, select for use insulated gate bipolar transistor (IGBT) as this semiconductor switch with an inverse parallel diode.The semiconductor switch of two differential concatenations can adopt the topological structure of " common emitter " or " common collector ".By controlling two semiconductor switchs respectively, current path can be connected by a certain direction, if two semiconductor switchs in the two-way power switch are controlled simultaneously, electric current is flowed to both direction, realize the direct electrical connection between input phase and the output mutually.
Fig. 2 shows in detail the circuit diagram of topological structure for the two-way power switch 2 of " common emitter ".Each semiconductor switch S1 and S2 can distinguish control separately.If two semiconductor switch S1 and S2 drive simultaneously, then two-way power switch 2 is realized two-way admittances; If only drive among two semiconductor switch S1 and the S2, then two-way power switch 2 is realized unidirectional conducting.Fig. 3 shows the sense of current of bidirectional switch 2 and the corresponding relation of two semiconductor switch S1 and S2 state.The definition load current is the positive direction of electric current from the output of input phase flow direction mutually, then provides the semiconductor switch S1 of forward current passage to be called along pipe, provides the semiconductor switch S2 of negative current passage to be called contrary pipe.
Space vector according to the output voltage of the space vector of input current and expectation, according to the modulation strategy of matrix converter, can determine on off state combination, on off state order and the corresponding switching constant of nine two-way power switch in each modulation period.By this on off state order and switching constant control two-way power switch, then in each modulation period, can obtain the output voltage identical with the mean value of expecting voltage.
When the output of matrix converter switches to another input phase time mutually from an input, change of current step and order that must the strict regulations two-way power switch not be opened a way in not short circuit and output mutually mutually in order to guarantee in commutation course input.Therefore, two-way power switch safety, reliably, change of current strategy is one of key technology of matrix converter practicability fast.Many documents have proposed various change of current strategies, conclude and get up can be divided into based on the current mode change of current strategy of output current direction and the voltage-type change of current strategy that concerns based on input phase voltage relative size.Wherein, voltage-type two step change of current strategies have that commutation course is fast, switching loss is little, are not subjected to that operating condition influences, simple in structure, advantage such as cost is lower.
Following discussion is only limited to voltage-type two step change of current strategies.
Relative size relation according to each phase input voltage is divided into I with input voltage in each voltage cycle, II, and III, IV, V, VI be totally 6 intervals, shown in Fig. 4 (a).The relative size relation of three-phase input voltage remains constant in each is interval.Define that ceiling voltage is U in each interval three-phase voltage
P, ceiling voltage is called the P phase mutually; Minimum voltage is U in the three-phase voltage
N, minimum voltage is called the N phase mutually; Voltage between the centre in the three-phase voltage is U
M, intermediate voltage is called the M phase mutually.The correlation of three-phase input voltage in 6 intervals is listed among Fig. 4 (b).When being connected with ceiling voltage, output is called the P state; When being connected with minimum voltage, output is called the N state; When being connected with intermediate voltage, output is called the M state.
Traditional voltage-type two step change of current policy definitions: when P, M, N state, three two-way power switch 2 in each 3 * 1 structure 3 need be opened four semiconductor switchs.That is, except 2 semiconductor switchs as current channel is two-way open, the contrary pipe of high pressure phase and low pressure suitable pipe mutually are as assist exchanging circuit and open-minded.Traditional voltage-type two step change of current strategies have also defined three transient state PM in the commutation course, MN, NP.P, M, N state and PM, MN, during NP transient state, three two-way power switch combinations of states and change of current strategy are as shown in Figure 5 in each 3 * 1 structure.With the P state is example, and 2 semiconductor switchs of P phase are two-way open-minded as current channel, and M is open-minded with N suitable pipe mutually mutually simultaneously.As seen from Figure 5, just because of 2 semiconductor switchs of M, N phase as assist exchanging circuit and open-minded, when from the change of current of P state to the M state, the first step turn-off the P phase along pipe (entering transient state PM), second step was opened the contrary pipe of M phase, only needed for two steps just can be from the change of current of P state safety to the M state.
As seen from Figure 5, traditional voltage-type two goes on foot the two step changes of current that change of current strategies can be realized the two-way power switch between any two stable states.Commutation course only need greatly shorten the change of current time through an intermediateness, has reduced switching loss.But when input voltage changed interval (input line voltage is being crossed null range), as the zone 14 among Fig. 4 (a), because input two phase voltage value are approaching, its relative size was difficult to accurate judgement.In case the relative size misjudgment of input phase voltage will cause the measured state and the state of reality not to be inconsistent, and serious input phase short trouble then must occur.
Can see from Fig. 4 (a), when input voltage changes the interval, U can occur
PWith U
MVery approaching and U
MWith U
NVery near two kinds of situations.When the misjudgment of input voltage relative size, U can appear
P＜U
MOr U
M＜U
NSituation, as seen from Figure 5, obviously, no matter in the change of current moment (PM attitude or MN attitude) or in the non-change of current moment (P or M or N state), input phase U
PWith input U mutually
MOr input phase U
MWith input U mutually
NBetween form the loop by semiconductor switch.When input two-phase voltage difference surpasses the forward drop of two IGBT and two diodes, will serious input phase short trouble appear.Therefore, can traditional voltage-type two step change of current strategies be applied in practice, depends on whether have the device that can accurately detect input phase voltage relative size relation.Because input voltage exists factors such as interference and input filter phase lag all can influence the accurate judgement of checkout gear to input voltage relative size, therefore, design accurate checkout gear to realize that the accurate judgement to input phase voltage relative size relation is quite complicated and difficulty.Thereby the above matrix converter model machine of 5kW that present document is reported adopts current mode change of current strategy mostly.
Ziegler, people such as M in 2000 at paper " A New Two Steps CommutationPolicy For Low Cost Matrix Converters ", (a kind of new two step change of current strategies that are used for low-cost matrix converter) (power conversion.June 2000proceedings) proposed a kind of improved voltage-type two step change of current methods, this method is forbidden the change of current between two approaching input phase voltages of magnitude of voltage, thereby avoided the phenomenon of the short circuit that voltage two step change of current strategies may occur when voltage changes the interval, and do not needed accurate voltage check device.The shortcoming of this method is, forbids the change of current between two approaching input phase voltages of magnitude of voltage, though little to the output voltage waveforms influence,, the input voltage that should bear load current does not originally have mutually can output current, makes that input current no longer is sinusoidal.
The paper " Matrix ConverterCommutation Strategies With and Without Explicit Input Voltages SignMeasurement " that people such as Jochen Mahlein published in 2002 (a kind of matrix converter change of current strategy that input voltage is accurately measured that do not rely on) (IEEE transactions on industrial electronics, Vol.49, NO.2, april 2002) in proposed to change the voltage-type change of current strategy of preface method.This method has been avoided the change of current between two approaching input phase voltages of magnitude of voltage by the order of the combination of five on off states in each modulation period is adjusted, thereby has avoided the short circuit phenomenon that constantly may occur in the change of current.Owing to change the order that the preface method is only adjusted the on off state combination, so input current and average value of output voltage remain unchanged.But, change the preface method and just solved the short circuit problem that (PM, MN, NP transient state) occurs in the commutation course, be applicable to voltage-type four step change of current strategies, then powerless for voltage-type two step change of current strategies in the short circuit phenomenon that non-commutation course (P, M, N stable state) occurs.
Summary of the invention
The purpose of this utility model is to overcome the deficiency of above-mentioned technology, a kind of control device that is used for matrix converter is proposed, this device can solve the input phase voltage when changing the interval because of judging the inaccurate short circuit problem that occurs, and output voltage waveforms and input current waveform are unaffected.
The control device that is used for matrix converter that the utility model provides is characterized in that: this device comprises triggering drive circuit, current foldback circuit, synchronization signal detection circuit, voltage range division unit, on off state control unit and change of current control unit;
The input of synchronization signal detection circuit links to each other with three phase mains, measures the relative size relation of input phase voltage, and sends the voltage range division unit to;
The voltage range division unit will be imported the phase voltage interval and be divided between the primary area and between transition region, and a corresponding wayside signaling is sent to the on off state control unit;
The on off state control unit is determined the various on off state combinations and the time corresponding constant of each two-way power switch of matrix converter in each modulation period; Then, between the primary area of transmitting according to the voltage range division unit or the transition wayside signaling, on off state combination order when determining double-edge modulation; At last, press on off state combination order, give change of current control unit various on off state combinations, corresponding time constant and wayside signaling in each modulation period;
Change of current control unit is determined change of current strategy according to the signal that the on off state control unit transmits, and implements the control of commutation course, and output PWM modulation signal is given and triggered drive circuit;
After triggering the PWM modulation signal power amplification of drive circuit, provide gate pole triggering signal each two-way power switch to matrix converter with the transmission of change of current control unit;
The input of current foldback circuit is received the input of matrix converter, measures the input current of matrix converter, and output connects change of current control unit, realizes overcurrent protection function.
The utility model control device does not need to add the measurement mechanism of special accurate detection input phase voltage relative size relation, only by being divided into an input phase voltage between the primary area and between transition region, the new P of definition between transition region, M, N state and PM, NP, MN transient state and in each modulation period, select specific zero vector and adjust two-way power switch combinations of states order (change of current order), get final product realization matrix converter safety, reliably, the change of current and stable operation fast, solved the input phase voltage when changing the interval because of judging the inaccurate short circuit problem that occurs, and output voltage waveforms and input current waveform are unaffected.Particularly, the utility model has the following advantages with respect to prior art:
(1) owing to adopts the control method that goes on foot change of current strategies based on voltage-type between transition region two, no matter two-way power switch is operated in still transient state (commutation states) of stable state (non-commutation states), all avoided having solved the practicality problem of voltage-type two step change of current strategies because of input phase voltage relative size relation is judged the inaccurate input phase short circuit phenomenon that causes.
(2) because without any change of current restriction, and guarantee that each commutation course only needed for two steps, thereby commutation course is fast, output voltage waveforms is good, and switching loss is little.
(3) owing to the two step change of current strategies of voltage-type between transition region do not rely on the accurate measurement that input phase voltage relative size is concerned, on the one hand, do not need to design accurate measurement mechanism in addition, utilize the original input sync signal testing circuit of matrix converter to get final product.On the other hand, measurement result needn't be considered the phase lag problem that factor such as input filter causes, synchronization signal detection circuit can be installed in before the input filter, and the relative size relation of the measured three-phase mains voltage of measured waveform matter gets final product.Thereby the hardware configuration of matrix converter control device is simple, be easy to realize, cost is low.
(4) owing between transition region, adjusted change of current order, avoid rather than forbid the changes of current between two approaching input phase voltages of magnitude of voltage, thereby the output voltage and the input current average value of matrix converter remain unchanged, waveform is good.
(5) though at the specific zero vector of transition interval selection, its output common mode voltage magnitude maximum is selected zero vector by the requirement that reduces common-mode voltage between the primary area.Because the time between transition region is much smaller with respect to the time between the primary area, therefore, adopt select between the primary area respectively and between transition region the method for zero vector greatly reduce the matrix converter common-mode voltage.
Description of drawings
Fig. 1 is the topology diagram of three-phase matrix converter.
Fig. 2 is " common emitter " two-way power switch circuit diagram.
Fig. 3 is the corresponding relation of the bidirectional switch sense of current and two semiconductor switch S1 and S2 state.
Fig. 4 is input voltage interval division figure.Wherein (a) is input phase voltage u
a, u
b, u
cAt one-period change curve in time, (b) be the correlation of three-phase voltage in each interval.
Fig. 5 is the on off state figure of traditional electrical die mould two step change of current strategies.
Fig. 6 is the structural representation of the utility model control device.
Fig. 7 is between the input voltage primary area and transition interval division figure.
Fig. 8 is the on off state figure of voltage-type two step change of current strategies between transition region, and wherein (a) is U
P≈ U
MThe on off state figure of voltage-type two step change of current strategies (b) is U between transition region
M≈ U
NThe on off state figure of voltage-type two step change of current strategies between transition region.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
As shown in Figure 6, the utility model control device comprises triggering drive circuit 8, current foldback circuit 9, synchronization signal detection circuit 10, voltage range division unit 11, on off state control unit 12 and change of current control unit 13.
Three-phase matrix converter 1 is made of by 3 * 3 switch matrix forms nine two-way power switch 2, and load 4 is connected on the output phase A of matrix converter 1, B, C.The input of matrix converter 1 links to each other with filter 5, the input termination three phase mains 6 of filter.Clamp circuit 7 is connected on the input phase a of matrix converter 1, b, and c and output A mutually, B, over-voltage protecting function is realized at the C two ends.
The input of synchronization signal detection circuit 10 links to each other with three phase mains 6, measures the relative size relation of input phase voltage and gives voltage range division unit 11.
Voltage range division unit 11 is according to transition interval width preset value, voltage range division unit 11 in the following manner each input is divided in phase voltage cycle between 6 primary areas and 6 transition regions between, so that determine the interval of input phase voltage in each modulation period, and give on off state control unit 12 corresponding wayside signaling.
As shown in Figure 7, for dividing figure between the input voltage transition region and between the primary area.According to input three-phase voltage u
a, u
b, u
cRelative size relation, will import phase voltage and be divided into 12 intervals.The zone definitions that the three-phase voltage difference is bigger is between the primary area, is respectively I to VI between totally 6 primary areas.The relation of three-phase voltage is as follows between each primary area:
I:u between the primary area
a＞u
c＞u
b, U
P=u
a, U
M=u
c, U
N=u
b
II:u between the primary area
a＞u
b＞u
c, U
P=u
a, U
M=u
b, U
N=u
c
III:u between the primary area
b＞u
a＞u
c, U
P=u
b, U
M=u
a, U
N=u
c
IV:u between the primary area
b＞u
c＞u
a, U
P=u
b, U
M=u
c, U
N=u
a
V:u between the primary area
c＞u
b＞u
a, U
P=u
c, U
M=u
b, U
N=u
a
VI:u between the primary area
c＞u
a＞u
b, U
P=u
c, U
M=u
a, U
N=u
b
Near the intersection between per two primary areas, promptly importing the approaching zone definitions of two phase voltage value is between transition region, is respectively I-II to VI-I between totally 6 transition regions; The relation of three-phase voltage is as follows between each transition region:
Between the I-II transition region: u
aThe amplitude maximum, u
cAnd u
bMagnitude of voltage is comparatively approaching, U
P=u
a, U
M=u
c, U
N=u
b
Between the II-III transition region: u
cThe amplitude minimum, u
aAnd u
bMagnitude of voltage is comparatively approaching, U
P=u
a, U
M=u
b, U
N=u
c
Between the III-IV transition region: u
bThe amplitude maximum, u
aAnd u
cMagnitude of voltage is comparatively approaching, U
P=u
b, U
M=u
a, U
N=u
c
Between the IV-V transition region: u
aThe amplitude minimum, u
bAnd u
cMagnitude of voltage is comparatively approaching, U
P=u
b, U
M=u
c, U
N=u
a
Between the V-VI transition region: u
cThe amplitude maximum, u
bAnd u
aMagnitude of voltage is comparatively approaching, U
P=u
c, U
M=u
b, U
N=u
a
Between the VI-I transition region: u
bThe amplitude minimum, u
cAnd u
aMagnitude of voltage is comparatively approaching, U
P=u
c, U
M=u
a, U
N=u
b
At II-III, between three transition regions of IV-V and VI-I in, U
PWith U
MMagnitude of voltage is approaching, is designated as U
P≈ U
MBetween transition region.At I-II, between three transition regions of III-IV and V-VI in, U
MWith U
NMagnitude of voltage is approaching, is designated as U
M≈ U
NBetween transition region.The utility model will be further divided into U between 6 transition regions
P≈ U
MBetween transition region and U
M≈ U
NTwo kinds of situations between transition region.
Width between transition region is for the short circuit phenomenon decisive role of avoiding occurring between the two approaching inputs mutually of magnitude of voltage, and wide more between transition region, the possibility of input phase short circuit is more little.The setting of transition interval width is by the accuracy of input phase voltage synchronization signal detection circuit and the installation site decision of testing circuit.The width that the utility model is provided with between transition region represents that with the time span is generally 0.5ms～3.3ms.When the transition interval width was set to 3.3ms, at this moment, width was zero between the primary area, and the input phase voltage is divided between 6 transition regions.This implementation method does not influence the mean value of output voltage waveforms and input current waveform, but the amplitude of matrix converter common-mode voltage is increased.
On off state control unit 12 is at first determined the 5 kinds of switch combination states and the time corresponding constant of nine two-way power switch of matrix converter in each modulation period by the space vector modulation strategy; Then, according between the primary area or the transition wayside signaling, on off state combination order when determining double-edge modulation according to table one or table two; At last, press on off state combination order, give change of current control unit 13 5 kinds of on off state combinations, corresponding time constant and wayside signalings in each modulation period.
In each modulation period, choose zero vector and arrange two-way power switch combinations of states order by the principle that reduces switching loss and common-mode voltage, table one be between the primary area in two-way power switch combinations of states and race-card in half modulation period, in the table, the ternary letter representation of two-way power switch combinations of states of matrix converter 1 is as abb.The input phase that first output phase A of first letter representation matrix converter 1 is attached thereto; Second input phase that output phase B is attached thereto of second letter representing matrix converter 1; The 3rd the input phase that output phase C is attached thereto of the 3rd letter representation matrix converter 1; On off state combination abb represents that first of matrix converter 1 is exported phase A and input a connection mutually, and all b is connected the second output phase B with importing mutually with the 3rd output phase C.T in the table
1, T
2, T
3, T
4And T
0Expression the time constant of corresponding two-way power switch combinations of states.When the output voltage interval is even number with input current interval sum, T
1=T
α m, T
2=T
α n, T
3=T
β n, T
4=T
β mWhen the output voltage interval is odd number with input current interval sum, T
1=T
α n, T
2=T
α m, T
3=T
β m, T
4=T
β n
With the output voltage space vector in 1 interval, the input current space vector is example in 1 interval, two-way power switch combinations of states order is abb in half modulation period, aab, aac, acc and ccc, first output phase A change of current order is a-c as can be known, and the change of current order of second output phase B is b-a-c, and the change of current order of the 3rd output phase C is b-c.
Table one is based on two-way power switch combinations of states table between the primary area of state space modulation strategy
Occur magnitude of voltage between transition region near the change of current between mutually, the utility model is adjusted zero vector and change of current order in each modulation period between transition region.Table two be between transition region in two-way power switch combinations of states and race-card in half modulation period.Still with the output voltage space vector in 1 interval, the input current space vector is example in 1 interval, supposes that control is input as unity power factor, then contain in input current 1 interval between input phase voltage I-II transition region.As seen from Figure 7, a phase input voltage in this interval is always the highest u
a=U
P, b phase input voltage becomes intermediate voltage from minimum voltage, and c phase input voltage becomes minimum voltage from middle voltage, has input b, the approaching U of c two phase voltage value
M≈ U
NBetween transition region.The utility model is to avoid magnitude of voltage near the change of current between the phase, at the specific zero vector aaa of this interval selection, and this zero vector is arranged in after the combination of second on off state, then two-way power switch combinations of states order is abb in half modulation period, aab, aaa, aac and acc.Like this, output B is b-a-c with C change of current order mutually mutually, and the change of current phenomenon between b, the c two-phase can never appear importing in the output A not change of current mutually.Comparison sheet one and table two can see that the utility model passes through to select the order of specific zero vector and adjustment zero vector in each modulation period, have unified the change of current order of two output phases, have avoided voltage near the change of current phenomenon between the phase.
Two-way power switch combinations of states table equally also can be used between the primary area between the transition region shown in the table two, still, the common-mode voltage amplitude that selected specific zero vector produces between transition region for (0.866～1) of input phase voltage amplitude doubly.And the common-mode voltage amplitude of selecting between the primary area that zero vector produced only be input phase voltage amplitude (0～0.866) doubly.
Table two is based on two-way power switch combinations of states table between the transition region of state space modulation strategy
Change of current control unit 13 is determined change of current strategy according to wayside signaling according to Fig. 5 or Fig. 8, implements the control of commutation course, and output PWM modulation signal is given and triggered drive circuit 8.
At U
P≈ U
MBetween transition region, be short-circuited between mutually for fear of P and M, compare with P, M, N state between primary area shown in Figure 5, the utility model has been adjusted the two-way power switch state of stable state P state and M state, the two-way power switch state of N state is constant, the also corresponding change of transient state NP, MN.The P state has turn-offed 1 semiconductor switch that M opens as assist exchanging circuit between transition region; The M state has turn-offed 1 semiconductor switch that P opens as assist exchanging circuit between transition region, like this, can not occur measuring the inaccurate P that causes and the M short circuit phenomenon between mutually because of P phase voltage and M phase voltage relative size relation.On off state and change of current strategy concrete shown in Fig. 8 (a) are as follows:
During the P state, 2 semiconductor switchs of P phase are two-way open-minded as current channel, and 2 semiconductor switch complete shut-downs of M phase are disconnected, and the suitable pipe of N phase is as assist exchanging circuit and open-minded;
During the M state, 2 semiconductor switch complete shut-downs of P phase are disconnected, and 2 semiconductor switchs of M phase are two-way open-minded as current channel, and the suitable pipe of N phase is as assist exchanging circuit and open-minded;
During the N state, P mutually with M contrary pipe mutually as assist exchanging circuit and open-minded, 2 semiconductor switchs of N phase are two-way open-minded as current channel, and are identical with N state between the primary area;
During the MN state, 2 semiconductor switch complete shut-downs of P phase are disconnected, and the contrary pipe of M phase and N suitable pipe mutually are as assist exchanging circuit and open-minded;
During the NP state, 2 semiconductor switch complete shut-downs of M phase are disconnected, and the contrary pipe of P phase and N suitable pipe mutually are as assist exchanging circuit and open-minded, and be identical with NP state between the primary area.
The approaching P of voltage and the M commutation course between mutually can not be finished by two steps an of transient state, so the PM state does not exist.
When P arrived the change of current of N phase mutually, the suitable pipe that turn-offs the P phase earlier entered the NP state, opened M then simultaneously and entered the N state with N contrary pipe mutually mutually;
When N arrives the change of current of P phase mutually, turn-off earlier M simultaneously and enter the NP state with N contrary pipe mutually mutually, the suitable pipe of opening the P phase then enters the P state;
When M arrived the change of current of N phase mutually, the suitable pipe that turn-offs the M phase earlier entered the MN state, opened P then simultaneously and entered the N state with N contrary pipe mutually mutually;
When N arrives the change of current of M phase mutually, turn-off earlier P simultaneously and enter the MN state with N contrary pipe mutually mutually, the suitable pipe of opening the M phase then enters the M state;
Obviously, P and N mutually between the change of current only need be through a NP transient state, two steps finished; The change of current also only need be through a MN transient state mutually with N for M, and two steps finished.Do not allow the approaching P of magnitude of voltage and M mutually between the change of current.
At U
M≈ U
NBetween transition region, be short-circuited between mutually for fear of M and N, compare with P, M, N state between primary area shown in Figure 5, the utility model has been adjusted the two-way power switch state of stable state M state and N state, the two-way power switch state of P state is constant, the also corresponding change of transient state NP, MN.The M state has turn-offed 1 semiconductor switch that N opens as assist exchanging circuit between transition region; The N state has turn-offed 1 semiconductor switch that M opens as assist exchanging circuit between transition region, like this, can not occur measuring the inaccurate M that causes and the N short circuit phenomenon between mutually because of M phase voltage and N phase voltage relative size relation.On off state and change of current strategy concrete shown in Fig. 8 (b) are as follows:
During the P state, 2 semiconductor switchs of P phase are two-way open-minded as current channel, M mutually with N suitable pipe mutually as assist exchanging circuit and open-minded, identical with P state between the primary area;
During the M state, and open-minded, 2 semiconductor switchs of M phase are two-way open-minded as current channel as assist exchanging circuit for the contrary pipe of P phase, and 2 semiconductor switch complete shut-downs of N phase are disconnected;
During the N state, and open-minded, 2 semiconductor switch complete shut-downs of M phase are disconnected as assist exchanging circuit for the contrary pipe of P phase, and 2 semiconductor switchs of N phase are two-way open-minded as current channel;
During the PM state, and open-minded, 2 semiconductor switch complete shut-downs of N phase break as assist exchanging circuit for the contrary pipe of P phase and M suitable pipe mutually;
During the NP state, M mutually 2 semiconductor switch complete shut-downs is disconnected, and the contrary pipe of P phase and N suitable pipe mutually are as assist exchanging circuit and open-minded, and be identical with NP state between the primary area.
The approaching M of voltage and the N commutation course between mutually can not be finished by two steps an of transient state, so the MN state is not being deposited.
When P arrives the change of current of M phase mutually, turn-off earlier P simultaneously and enter the PM state with N suitable pipe mutually mutually, the contrary pipe of opening the M phase then enters the M state;
When M arrived the change of current of P phase mutually, the contrary pipe that turn-offs the M phase earlier entered the PM state, opened P then simultaneously and entered the P state with N suitable pipe mutually mutually;
When P arrives the change of current of N phase mutually, turn-off earlier P simultaneously and enter the NP state with M suitable pipe mutually mutually, the contrary pipe of opening the N phase then enters the N state;
When N arrived the change of current of P phase mutually, the contrary pipe that turn-offs the N phase earlier entered the NP state, opened P then simultaneously and entered the P state with M suitable pipe mutually mutually;
Obviously, P and M mutually between the change of current only need be through a PM transient state, two steps finished; The change of current also only need be through a NP transient state mutually with N for P, and two steps finished.Do not allow the approaching M of magnitude of voltage and N mutually between the change of current.
Triggering drive circuit 8 provides the gate pole triggering signal for nine two-way power switch of matrix converter.The input of current foldback circuit 9 is received the input of matrix converter 1, measures the input current of matrix converter, and output connects change of current control unit 13, realizes overcurrent protection function.
In the utility model control device, synchronization signal detection circuit 10 is installed between three-phase input power supply and the input filter, measures the relative size relation of three-phase input power supply.Because input power supply phase voltage waveform is good, interference is few, synchronization signal detection circuit 10 adopts simple custom circuit, need not the measurement mechanism that specialized designs accurately detects input phase voltage relative size relation; Consider that the voltage-phase that input filter causes lags behind, transition interval width preset value is set at 1.8ms in the interval division unit 11.Be simplified control circuit, interval division unit 11 and change of current control unit 13 are share a slice CPLD (CPLD) realization; On off state control unit 12 adopts digital signal processor (DSP) to realize because amount of calculation is big.
Claims (1)
1, a kind of control device that is used for matrix converter is characterized in that: this device comprises triggering drive circuit (8), current foldback circuit (9), synchronization signal detection circuit (10), voltage range division unit (11), on off state control unit (12) and change of current control unit (13);
The input of synchronization signal detection circuit (10) links to each other with three phase mains (6), measures the relative size relation of input phase voltage, and sends voltage range division unit (11) to;
Voltage range division unit (11) will be imported the phase voltage interval and be divided between the primary area and between transition region, and a corresponding wayside signaling is sent on off state control unit (12);
On off state control unit (12) is determined the various on off state combinations and the time corresponding constant of each two-way power switch of matrix converter in each modulation period; Then, between the primary area of transmitting according to voltage range division unit (11) or the transition wayside signaling, on off state combination order when determining double-edge modulation; At last, press on off state combination order, give change of current control unit (13) various on off state combinations, corresponding time constant and wayside signaling in each modulation period;
Change of current control unit (13) is determined change of current strategy according to the signal that on off state control unit (12) transmits, and implements the control of commutation course, and output PWM modulation signal is given and triggered drive circuit (8);
After triggering the PWM modulation signal power amplification of drive circuit (8), provide gate pole triggering signal each two-way power switch to matrix converter with change of current control unit (13) transmission;
The input of current foldback circuit (9) is received the input of matrix converter (1), measures the input current of matrix converter, and output connects change of current control unit (13), realizes overcurrent protection function.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200882375U CN201167289Y (en) | 2007-11-16 | 2007-11-16 | Control device for matrix transducer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200882375U CN201167289Y (en) | 2007-11-16 | 2007-11-16 | Control device for matrix transducer |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101741257B (en) * | 2009-12-24 | 2012-05-09 | 合肥工业大学 | Control system for restraining common-mode voltage of dual stage matrix converter |
| CN101867300B (en) * | 2009-04-16 | 2012-07-11 | 上海三菱电梯有限公司 | Control method and control device for matrix converter |
| CN102624016A (en) * | 2012-03-15 | 2012-08-01 | 华中科技大学 | Bidirectional energy flowing flow battery energy storage grid connection device and control method thereof |
| CN102257716B (en) * | 2008-12-18 | 2014-01-15 | 施耐德东芝换流器欧洲公司 | Matrix converter variable speed drive |
| CN111800058A (en) * | 2020-09-03 | 2020-10-20 | 浙江大学 | Electric energy quality optimization method of motor system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102257716B (en) * | 2008-12-18 | 2014-01-15 | 施耐德东芝换流器欧洲公司 | Matrix converter variable speed drive |
| CN101867300B (en) * | 2009-04-16 | 2012-07-11 | 上海三菱电梯有限公司 | Control method and control device for matrix converter |
| CN101741257B (en) * | 2009-12-24 | 2012-05-09 | 合肥工业大学 | Control system for restraining common-mode voltage of dual stage matrix converter |
| CN102624016A (en) * | 2012-03-15 | 2012-08-01 | 华中科技大学 | Bidirectional energy flowing flow battery energy storage grid connection device and control method thereof |
| CN102624016B (en) * | 2012-03-15 | 2014-05-07 | 华中科技大学 | Bidirectional energy flowing flow battery energy storage grid connection device and control method thereof |
| CN111800058A (en) * | 2020-09-03 | 2020-10-20 | 浙江大学 | Electric energy quality optimization method of motor system |
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