CN105005639A - MATLAB model capable of simulating actual characteristics of thyristor and construction method - Google Patents
MATLAB model capable of simulating actual characteristics of thyristor and construction method Download PDFInfo
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Abstract
The invention provides an MATLAB model capable of simulating actual characteristics of a thyristor and a construction method. The structure comprises an original thyristor model in an MATLAB, a signal control module, an enabling system module and a follow current module; on the basis of the thyristor model in the MATLAB, a current value is acquired and subjected to logic calculation through the signal control module and is used as an input signal and an enabling control signal of the enabling system module; and an output signal is used for controlling the follow current module through comparative calculation of the enabling system module, so that a follow-current current of the thyristor is generated. On the basis, voltage and current in the model are measured, and four ports a, k, g and m of the model are defined again to form a newly-established thyristor model. The MATLAB model has the advantages that a reverse recovery curve of the current in the thyristor can be reflected, and an ideal defect that a current curve in the thyristor model in the MATLAB is suddenly stopped is compensated, so that the actual characteristics of the thyristor are represented and the application value is relatively high.
Description
Technical field
What the present invention relates to is a kind of MATLAB model and construction method of emulating thyristor actual characteristic.
Background technology
Have the volt-ampere characteristic of the thyristor of actual characteristic, is its forward characteristic representated by the first quartile in Fig. 1-1, and representated by third quadrant is its reverse characteristic.When
time, if impose forward voltage at thyristor two ends, then its not conducting.If forward voltage continues to increase, until its value exceedes break over voltage
time, its conducting can be made.From Fig. 1-1, along with
increase gradually,
reduce gradually.If when thyristor two ends impose reverse voltage, then it turns off, if reverse voltage continues to increase, when reaching breakdown reverse voltage, its inverse current increases rapidly, if limit not in time, it can be made to generate heat and even puncture.Therefore, the trigger voltage that the forward and reverse voltage needed for thyristor and gate circuit provide, electric current all should control in rational scope.Flow through the electric current of thyristor in time shown in change curve Fig. 1-2, thyristor crosses forward current at forward voltage flows by action, and under reverse voltage effect, electric current drops to reverse maximal value
, be then decreased to zero with certain rule.Because Thyristor Model original in MATLAB only has forward characteristic, when applying reverse voltage at its two ends, it is 0 that its current value directly ends, and does not meet electric current reverse recovery characteristic during thyristor normal turn-off.Therefore need on the basis of original Thyristor Model, add reverse recovery characteristic module, thus set up out the Thyristor Model that can embody actual characteristic, so that be applied in the thyristor circuit emulation of various complexity.
Summary of the invention
What the present invention proposed is a kind of MATLAB model construction method emulating thyristor actual characteristic, its object is intended to the above-mentioned defect overcome existing for prior art, the Reverse recovery curve of electric current in thyristor can be reflected, the idealized defect that in the Thyristor Model carried in MATLAB, current curve ends suddenly can be made up well, thus embody the actual characteristic of Thyristor Model.
Technical solution of the present invention: a kind of MATLAB model emulating thyristor actual characteristic, its structure comprises original Thyristor Model 1, signal control module 2, enabled systems module 3 and afterflow module 4 in MATLAB, the wherein signal input part of the signal output part connection signal control module 2 of original Thyristor Model 1, the signal output part of signal control module 2 connects the signal input part of enabled systems module 3, and the signal output part of enabled systems module 3 continues the signal input part of flow module 4.
Its construction method, on thyristor module 1 basis carried in MATLAB, for the original Thyristor Model 1 carried in MATLAB, through signal control module, temporal logical operation is carried out to the current value gathered, judge that current value is reduced to the moment of zero, as the control signal of enabled systems module.To gather current value after differentiation element effect as the input signal of enabled systems module.Again by adopting enabled systems module to judge whether electric current arrives reverse maximal value, if with certain exponential function rule output current signal after reaching reverse maximal value, its current signal exported controls afterflow module, thus produces the freewheel current of thyristor.On this basis, the voltage of measurement port m in original Thyristor Model 1, current signal are measured, by adding signal control module 2, enabled systems module 3 and afterflow module 4, definition is re-started to thyristor anode a, negative electrode k, gate pole g and measurement port m, thus forms newly-built Thyristor Model.
The invention has the beneficial effects as follows:
1) Thyristor Model set up can reflect the Reverse recovery curve of electric current in thyristor, can make up the idealized defect that in the Thyristor Model carried in MATLAB, current curve ends suddenly well, thus embody the actual characteristic of Thyristor Model;
2) Thyristor Model set up can the mathematical model of unrestricted choice reverse recovery current, by the maximum reverse restoring current value in amendment enabled systems module and current attenuation exponential function formula, thus reflection has the reverse recovery current curve of the thyristor of different qualities, by this models applying in the thyristor circuit emulation of various complexity, good adaptability and extendability can be had;
3) the Thyristor Model structure set up is comparatively simple, easy to use, has stronger using value.
Accompanying drawing explanation
Fig. 1-1 is the volt-ampere characteristic figure of the thyristor with actual characteristic;
Fig. 1-2 is the electric current change curve in time flowing through thyristor;
Fig. 1 is topological structure block diagram of the present invention;
Fig. 2 is the invention process case MATLAB analogous diagram;
Fig. 3 and Fig. 4 is the invention process case MATLAB simulation data oscillogram;
Fig. 5 is the structural representation of new Thyristor Model 5;
Fig. 6 is the structural representation of signal control module 2;
Fig. 7 is the structural representation of enabled systems module 3;
Fig. 8 is the structural representation of Fcn module;
Embodiment
Emulate a MATLAB model for thyristor actual characteristic, its structure be comprise in MATLAB original
Thyristor Model 1, signal control module 2, enabled systems module 3 and afterflow module 4, the wherein signal input part of the signal output part connection signal control module 2 of original Thyristor Model 1, the signal output part of signal control module 2 connects the signal input part of enabled systems module 3, the signal output part of enabled systems module 3 continues the signal input part of flow module 4
Its construction method: on thyristor module 1 basis carried in MATLAB, for the original Thyristor Model 1 carried in MATLAB, through signal control module, temporal logical operation is carried out to the current value gathered, judge that current value is reduced to the moment of zero, as the control signal of enabled systems module.To gather current value after differentiation element effect as the input signal of enabled systems module.Again by adopting enabled systems module to judge whether electric current arrives reverse maximal value, if with certain exponential function rule output current signal after reaching reverse maximal value, its current signal exported controls afterflow module, thus produces the freewheel current of thyristor.On this basis, the voltage of measurement port m in original Thyristor Model 1, current signal are measured, by adding signal control module 2, enabled systems module 3 and afterflow module 4, definition is re-started to thyristor anode a, negative electrode k, gate pole g and measurement port m, thus forms newly-built Thyristor Model.
Described employing signal control module carries out temporal logical operation to the current value gathered, and judges that current value is reduced to the moment of zero.The effect of described employing enabled systems module and afterflow module is the freewheel current producing thyristor.
The newly-built Thyristor Model of described formation, can reflect the Reverse recovery curve of electric current in thyristor, makes up the idealized defect that electric current in the Thyristor Model carried in MATLAB ends suddenly, thus embodies the actual characteristic of Thyristor Model.
The newly-built Thyristor Model of described formation is by the maximum reverse restoring current value in amendment enabled systems module and current attenuation exponential function formula, thus reflection has the Reverse recovery curve of the thyristor of different qualities, by this models applying in the thyristor circuit emulation of various complexity, there is good adaptability and extendability.
The input end of described signal control module 2 is the signal output part of original Thyristor Model 1, and its output terminal is the signal input part of enabled systems module 3.
The input end of described enabled systems module 3 is the signal output part of signal control module 2, and its output terminal is the signal input part of afterflow module 4.
The input end of described afterflow module 4 is the signal output part of enabled systems module 3, and its output terminal is the signal input part of original Thyristor Model 1.
Described new Thyristor Model 5 is made up of jointly original Thyristor Model 1, signal control module 2, enabled systems module 3 and afterflow module 4.
Below in conjunction with accompanying drawing and concrete case study on implementation, illustrate technical scheme of the present invention further:
The reversely restoring process of thyristor refers to that thyristor after switch, removes suddenly the forward voltage being applied to thyristor anode and negative electrode two ends, and when two interpolars are applied with reverse voltage, thyristor recovers the process of blocking ability by being conducting to.According to the analysis to its reverse recovery characteristic curve, can suppose that its reverse recovery current arrives maximal value
after, become attenuation trend until to zero with a certain coefficient of endemism function rule, exponential function is shown below, and utilizes this formula to set up its reverse recovery current and can make up the idealized defect that in the Thyristor Model carried in MATLAB, electric current ends suddenly well.
Although carried the electrical model of thyristor device in MATLAB, but because this model only comprises forward conduction characteristic, not enough to the performance of its reverse recovery characteristic, therefore need to the modeling again of original thyristor 1, increase the reverse recovery characteristic curve of electric current in thyristor practice, so that simulate the switching process of thyristor more accurately.
As shown in Figure 1, a kind of MATLAB modeling method emulating thyristor actual characteristic.On thyristor module 1 basis carried in MATLAB, by adding signal control module 2, enabled systems module 3 and afterflow module 4, reverse recovery current is produced in thyristor turn off process, and measured by the voltage to measurement port m in original Thyristor Model 1, current signal, definition is re-started to thyristor anode a, negative electrode k, gate pole g and measurement port m.Therefore, build out smoothly by carrying out self-defined and perfect, new Thyristor Model 5 to original model, as shown in Figure 5.
Detailed Thyristor is original thyristor module 1 in MATLAB.On this basis, thyristor needs to be gathered and logical operation its current value by signal control module 2, and the Signal Control Subsystem module in figure is signal control module 2, and this module as shown in Figure 6.Consider according to the time of modeling, when judging that thyristor module decays to zero, namely thyristor starts to bear reverse voltage at 0.01s, therefore need time module and steady state value 0.01s to compare, on this basis, export, according to enable output after 0.01s according to forward conduction electric current before 0.01s.
Thyristor needs the comparison operation by enabled systems module 3, thus is used for controlling the current value that afterflow module 4 produces correspondence.Enable Subsystem module in figure is enabled systems module 3, and this module as shown in Figure 7.After the electric current in thyristor is down to zero, calculate its current changing rate by differential module
as the input signal of enabled systems module 3, produce inverse current as exporting the conducting controlling controllable current source by enabled systems module 3.Here the maximal value setting inverse current is 200A, and when not reaching 200A, electric current continues to decline until reach 200A according to a certain speed, and now electric current reduces straight zero according to the exponential law of setting.
Wherein reverse recovery current is attenuation trend according to the exponential function relation of setting, and computing formula is as follows.
Wherein,
for maximum reverse current, get 200A here,
for maximum reverse recovery charge,
for time attenuation constant, generally get 60 ~ 80, get 70 here.
The Fcn module set up by above-mentioned formula as shown in Figure 8.
Thyristor needs the freewheel current being produced thyristor by afterflow module 4, and the Controlled Current Source module in figure is afterflow module 4.
case study on implementation
The present invention is undertaken emulating by MATLAB/SIMULINK and verifies, Fig. 2 is the MATLAB analogous diagram of the invention process case.Thyristor Model shown in figure is newly-built thyristor package module, and wherein forward applies voltage is 200V, and oppositely applying voltage is 1000V, by the complementary conducting isolating switch of Pulse Width Control breaker1 and breaker2, realizes thyristor forward and reverse alternate conduction.Pulsed frequency is 50Hz, dutycycle is 50%, when break1 is first closed, thyristor two ends apply forward voltage, start to provide trigger pulse, after waiting its stable conducting to gate circuit transistor gate, disconnect break1, closed break2, thyristor two ends start to apply reverse voltage, and it recovers blocking state gradually.
Fig. 3 is the output voltage wave of thyristor in the implementation case, and Fig. 4 is the current output waveform of thyristor in the implementation case.Known by simulation waveform, the voltage curve of newly-built Thyristor Model remains unchanged, and current curve has reverse recovery characteristic.When thyristor is in conducting on the occasion of, consistent with original Thyristor Model, start after bearing reverse voltage when 0.01s to reduce rapidly with certain speed, until after dropping to maximum current-200A, be restored to zero according to certain Changing Pattern.This current characteristic curve more meets the actual characteristic of thyristor, therefore this modeling method is feasible.
Claims (10)
1. one kind can emulate the MATLAB model of thyristor actual characteristic, it is characterized in that comprising original Thyristor Model in MATLAB, signal control module, enabled systems module and afterflow module, the wherein signal input part of the signal output part connection signal control module of original Thyristor Model, the signal output part of signal control module connects the signal input part of enabled systems module, and the signal output part of enabled systems module continues the signal input part of flow module.
2. a kind of construction method emulating the MATLAB model of thyristor actual characteristic as claimed in claim 1, it is characterized in that on the thyristor module basis that carries in MATLAB, for the original Thyristor Model carried in MATLAB, through signal control module, temporal logical operation is carried out to the current value gathered, judge that current value is reduced to the moment of zero, as the control signal of enabled systems module; To gather current value after differentiation element effect as the input signal of enabled systems module; Again by adopting enabled systems module to judge whether electric current arrives reverse maximal value, if with certain exponential function rule output current signal after reaching reverse maximal value, its current signal exported controls afterflow module, thus produces the freewheel current of thyristor; On this basis, the voltage of measurement port m in original Thyristor Model, current signal are measured, by adding signal control module, enabled systems module and afterflow module, definition being re-started to thyristor anode, negative electrode, gate pole and measurement port, thus forms newly-built Thyristor Model.
3. a kind of structure emulating the MATLAB model of thyristor actual characteristic according to claim 2
Method, is characterized in that: described employing signal control module carries out temporal logical operation to the current value gathered, and judges that current value is reduced to the moment of zero.
4. a kind of structure emulating the MATLAB model of thyristor actual characteristic according to claim 2
Method, is characterized in that: described employing enabled systems module and the effect of afterflow module are the freewheel current producing thyristor.
5. a kind of structure emulating the MATLAB model of thyristor actual characteristic according to claim 2
Method, it is characterized in that: the newly-built Thyristor Model of described formation, the Reverse recovery curve of electric current in thyristor can be reflected, make up the idealized defect that electric current in the Thyristor Model carried in MATLAB ends suddenly, thus embody the actual characteristic of Thyristor Model.
6. a kind of structure emulating the MATLAB model of thyristor actual characteristic according to claim 2
Method, it is characterized in that: the newly-built Thyristor Model of described formation is by the maximum reverse restoring current value in amendment enabled systems module and current attenuation exponential function formula, thus reflection has the Reverse recovery curve of the thyristor of different qualities, by this models applying in the thyristor circuit emulation of various complexity, there is good adaptability and extendability.
7. a kind of MATLAB model emulating thyristor actual characteristic according to claim 1, it is special
Levy and be: the input end of described signal control module is the signal output part of original Thyristor Model, and its output terminal is the signal input part of enabled systems module.
8. a kind of MATLAB model emulating thyristor actual characteristic according to claim 1, it is special
Levy and be: the input end of described enabled systems module is the signal output part of signal control module, and its output terminal is the signal input part of afterflow module.
9. a kind of MATLAB model emulating thyristor actual characteristic according to claim 1, it is special
Levy and be: the input end of described afterflow module is the signal output part of enabled systems module, and its output terminal is the signal input part of original Thyristor Model.
10. a kind of construction method emulating the MATLAB model of thyristor actual characteristic according to claim 2, is characterized in that: described new Thyristor Model is made up of jointly original Thyristor Model, signal control module, enabled systems module and afterflow module.
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