CN103607128B - A kind of control method of voltage source inverter and control device - Google Patents
A kind of control method of voltage source inverter and control device Download PDFInfo
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- CN103607128B CN103607128B CN201310655387.XA CN201310655387A CN103607128B CN 103607128 B CN103607128 B CN 103607128B CN 201310655387 A CN201310655387 A CN 201310655387A CN 103607128 B CN103607128 B CN 103607128B
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Abstract
The invention provides a kind of control method and control device of voltage source inverter, first the load current of voltage source inverter is obtained, then load current is changed into feedback voltage, by feedback voltage is added with the controlled quentity controlled variable voltage of voltage source inverter, realize the revision to controlled quentity controlled variable voltage, secondary current due to isolating transformer equals the load current of voltage source inverter, so, achieve the control to isolating transformer secondary voltage, improve the dynamic response of voltage source inverter, effectively reduce the impact of load disturbance on voltage source inverter, thus ensure that voltage source inverter exports constant voltage.
Description
Technical field
The present invention relates to voltage source inverter technical field, more particularly, relate to control method and the control device of a kind of control voltage source type inverter work.
Background technology
The voltage source inverter with isolating transformer can only detect the original edge voltage of isolating transformer in some use occasions, and secondary voltage is not controlled, particularly when the little internal resistance of isolating transformer capacity is large, if in the secondary switching load of isolation transformation, the voltage fluctuation exported causing secondary is larger, and during voltage stabilization, pressure drop is larger again.So in the occasion high to voltage source inverter performance requirement, need to do extra process to voltage source inverter, could instructions for use be met.Therefore, how ensureing that voltage source inverter exports constant voltage, is those skilled in the art's technical problems urgently to be resolved hurrily.
Summary of the invention
In view of this, the invention provides a kind of control method and control device of voltage source inverter, to reduce the impact of load disturbance on voltage source inverter, thus ensure that voltage source inverter exports constant voltage.
A control method for voltage source inverter, is applied to voltage source inverter, has isolating transformer in described voltage source inverter, and described control method comprises:
Obtain the load current of described voltage source inverter;
Obtain the current amplitude of described load current;
By the secondary internal resistance of described isolating transformer equivalence to the former limit of described isolating transformer, obtain equivalent former limit internal resistance;
Described current amplitude is multiplied with described equivalence former limit internal resistance, obtains feedback voltage;
Described feedback voltage is added with the given voltage of described voltage source inverter, first time revision is carried out to described given voltage, obtains the given voltage of the first revision;
According to no-load voltage ratio and the modulation system of described isolating transformer, second time revision is carried out to the given voltage of described first revision, obtains the given voltage of the second revision;
Obtain the controlled quentity controlled variable voltage of described voltage source inverter;
The given voltage of described second revision is added with described controlled quentity controlled variable voltage, described controlled quentity controlled variable voltage is revised, obtains revised described controlled quentity controlled variable voltage.
Preferably, the controlled quentity controlled variable voltage of the described voltage source inverter of described acquisition comprises:
Obtain the original edge voltage of described isolating transformer;
Calculate the effective value voltage of described original edge voltage;
Described effective value voltage passing ratio integral controller is carried out proportional integral adjustment, obtains described controlled quentity controlled variable voltage.
Preferably, the current amplitude of the described load current of described acquisition comprises:
Described load current is obtained the first filtered circuit through the first filter;
Described load current is obtained the second filtered circuit through the second filter;
The first electric current is obtained according to described first filtered circuit and described second filtered circuit;
According to the discrete processes process of described first filter and described second filter, obtain coefficient of dispersion;
Described first electric current is multiplied with described coefficient of dispersion, obtains the current amplitude of described load current.
Preferably, the model of described first filter is different with the model of described second filter.
Preferably, also comprise:
Control revised described controlled quentity controlled variable voltage and produce pulse width modulated waveform, to drive the inverter operation of described voltage source inverter.
A kind of control device of voltage source inverter, be applied to voltage source inverter, have isolating transformer in described voltage source inverter, described control device comprises: the first acquiring unit, second acquisition unit, equivalent unit, quadrature unit, the first revision unit, the second revision unit, the 3rd acquiring unit and the 3rd revision unit;
Described first acquiring unit, for obtaining the load current of described voltage source inverter;
Described second acquisition unit, for obtaining the current amplitude of described load current;
Described equivalent unit, for the secondary internal resistance of described isolating transformer equivalence being arrived the former limit of described isolating transformer, obtains equivalent former limit internal resistance;
Described quadrature unit, for being multiplied with described equivalence former limit internal resistance by described current amplitude, obtains feedback voltage;
Described first revision unit, for being added with the given voltage of described voltage source inverter by described feedback voltage, carrying out first time revision to described given voltage, obtaining the given voltage of the first revision;
Described second revision unit, for according to the no-load voltage ratio of described isolating transformer and modulation system, carries out second time to the given voltage of described first revision and revises, obtain the given voltage of the second revision;
Described 3rd acquiring unit, for obtaining the controlled quentity controlled variable voltage of described voltage source inverter;
Described 3rd revision unit, for being added with the controlled quentity controlled variable voltage of described voltage source inverter by the given voltage of described second revision, revising described controlled quentity controlled variable voltage, obtaining revised described controlled quentity controlled variable voltage.
Preferably, described 3rd acquiring unit comprises: first obtains subelement, the first computation subunit and process subelement;
Described first obtains subelement, for obtaining the original edge voltage of described isolating transformer;
Described first computation subunit, for calculating the effective value voltage of described original edge voltage;
Described process subelement, for described effective value voltage passing ratio integral controller is carried out proportional integral adjustment, obtains described controlled quentity controlled variable voltage.
Preferably, described second acquisition unit comprises: the first filtering subelement, the second filtering subelement, the first process subelement, the second process subelement and the 3rd process subelement;
Described first filtering subelement, for obtaining the first filtered circuit by described load current through the first filter;
Described second filtering subelement, for obtaining the second filtered circuit by described load current through the second filter;
Described first process subelement, for obtaining the first electric current according to described first filtered circuit and described second filtered circuit;
Described second process subelement, for the discrete processes process according to described first filter and described second filter, obtains coefficient of dispersion;
Described 3rd process subelement, for being multiplied with described coefficient of dispersion by described first electric current, obtains the current amplitude of described load current.
Preferably, the model of described first filter is different with the model of described second filter.
Preferably, also comprise:
Control unit, produces pulse width modulated waveform, to drive the inverter operation of described voltage source inverter for controlling revised described controlled quentity controlled variable voltage.
As can be seen from above-mentioned technical scheme, the invention provides a kind of control method and control device of voltage source inverter, first the load current of voltage source inverter is obtained, then load current is changed into feedback voltage, by feedback voltage is added with the controlled quentity controlled variable voltage of voltage source inverter, realize the revision to controlled quentity controlled variable voltage, secondary current due to isolating transformer equals the load current of voltage source inverter, so, achieve the control to isolating transformer secondary voltage, improve the dynamic response of voltage source inverter, effectively reduce the impact of load disturbance on voltage source inverter, thus ensure that voltage source inverter exports constant voltage.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural representation of Fig. 1 a kind of voltage source inverter disclosed in the embodiment of the present invention;
The flow chart of Fig. 2 a kind of control method of voltage source inverter disclosed in the embodiment of the present invention;
Fig. 3 is a kind of flow chart obtaining the method for the controlled quentity controlled variable voltage of voltage source inverter disclosed in the embodiment of the present invention;
Fig. 4 is a kind of flow chart obtaining the method for the current amplitude of load current disclosed in the embodiment of the present invention;
The oscillogram of Fig. 5 a kind of linear load and rectifier load electric current and extraction waveform thereof disclosed in the embodiment of the present invention;
The oscillogram of Fig. 6 a kind of feedfoward control transformer primary secondary voltage disclosed in the embodiment of the present invention;
Fig. 7 is a kind of oscillogram of not carrying out feedforward transformer primary secondary voltage waveform disclosed in the embodiment of the present invention;
The structural representation of Fig. 8 a kind of control device of voltage source inverter disclosed in the embodiment of the present invention;
The structural representation of the 3rd acquiring unit in Fig. 9 a kind of Fig. 8 disclosed in the embodiment of the present invention;
The structural representation of second acquisition unit in Figure 10 a kind of Fig. 8 disclosed in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
See Fig. 1, the embodiment of the invention discloses a kind of structural representation of voltage source inverter, voltage source inverter comprises: direct current supply voltage V
dc, filter capacitor C
dc, the first switching device S1, second switch device S2, the 3rd switching device S3, the 4th switching device S4, inductance L, electric capacity C, voltage sensor VT, isolating transformer T, current sensor CT, isolating transformer T equivalent internal resistance convert secondary resistance R, the load Z of secondary, the voltage U be added on load Z
1and pass through the actual loading electric current I a of secondary resistance R, the no-load voltage ratio of isolating transformer T is n:1;
Wherein, filter capacitor C
dcpositive plate connect direct current supply voltage V
dcpositive pole, negative plate connects direct current supply voltage V
dcnegative pole;
The input of the first switching device S1 is all connected direct current supply voltage V with the input of the 3rd switching device S3
dcpositive pole, the output of second switch device S2 is all connected direct current supply voltage V with the output of the 4th switching device S4
dcnegative pole;
The output of the first switching device S1 connects the input of second switch device S2, and the output of the 3rd switching device S3 connects the input of the 4th switching device S4;
One end of inductance L connects the output of the first switching device S1, and the other end of inductance L connects the former limit of the positive plate of electric capacity C, the input of voltage sensor VT and isolating transformer T respectively;
The negative plate of electric capacity C connects the former limit of the input of the 4th switching device S4, the output of voltage sensor VT and isolating transformer T respectively;
Current sensor CT, secondary resistance R and load Z are connected in series in the secondary of isolating transformer T.
See Fig. 2, the embodiment of the invention discloses a kind of flow chart of control method of voltage source inverter, described control method is applied to voltage source inverter, and the structural representation of voltage source inverter is see Fig. 1, and control method comprises step:
The load current Iac of S11, acquisition voltage source inverter;
Wherein, the actual loading electric current of voltage source inverter is Ia, but due to reasons such as measure errors, causes the load current obtained to be Iac.
The current amplitude I of S12, acquisition load current Iac
o;
S13, by the secondary internal resistance of described isolating transformer equivalence to the former limit of described isolating transformer, obtain equivalent former limit internal resistance K
1;
Wherein, K
1acquisition process see formula (1):
Wherein, R' is equiva lent impedance after voltage source inverter conversion, and SL is the reactor transfer function ignoring internal resistance, K
2for feed-forward coefficients, K
pWMfor inverter bridge equivalent gain.
S14, by current amplitude I
owith equivalence former limit internal resistance K
1be multiplied, obtain feedback voltage;
S15, by the given voltage U of described feedback voltage and described voltage source inverter
rbe added, to described given voltage U
rcarry out first time revision, obtain the given voltage U of the first revision
r';
The no-load voltage ratio of S16, foundation isolating transformer T and modulation system, to the given voltage U of the first revision
r' carry out second time revision, obtain the given voltage of the second revision;
Well known to a person skilled in the art and be, according to the no-load voltage ratio of isolating transformer T and the relation of modulation system, can feed-forward coefficients K be obtained
2, by the given voltage U of the first revision
r' and feed-forward coefficients K
2be multiplied, the given voltage of the second revision can be obtained, thus realize the feedfoward control to voltage source inverter.
S17, obtain the controlled quentity controlled variable voltage U of described voltage source inverter
v;
S18, by described second revision given voltage and described controlled quentity controlled variable voltage U
vbe added, described controlled quentity controlled variable voltage revised, obtains revised described controlled quentity controlled variable voltage U
v.
In summary it can be seen, the control method of a kind of voltage source inverter provided by the invention, first obtain the load current Iac of voltage source inverter, then load current Iac is changed into feedback voltage, by the controlled quentity controlled variable voltage U by feedback voltage and voltage source inverter
vbe added, realize controlled quentity controlled variable voltage U
vrevision, secondary current due to isolating transformer equals the load current Iac of voltage source inverter, so, achieve the control to isolating transformer secondary voltage, improve the dynamic response of voltage source inverter, effectively reduce load Z disturbance to the impact of voltage source inverter, thus ensure that voltage source inverter exports constant voltage.
The present embodiment can also comprise:
S19, control revised controlled quentity controlled variable voltage U
vproduce pulse width modulation (PulseWidthModulation, PWM) waveform, to drive the inverter operation of described voltage source inverter.
Concrete, control revised described controlled quentity controlled variable voltage and produce PWM waveform by algorithm, thus drive the inverter operation of described voltage source inverter.
PWM switching device and inverter transfer function are
sL is the reactor transfer function ignoring internal resistance, and R' is equiva lent impedance after voltage source inverter conversion, K
pWMfor inverter bridge equivalent gain.
Preferably, see Fig. 3, step S17 specifically comprises:
S171, obtain the original edge voltage U of described isolating transformer
p;
S172, calculate original edge voltage U
peffective value voltage U
rMS;
Concrete, by original edge voltage U
pobtain effective value voltage U
rMS, see formula (2):
Wherein, T is power frequency period.
S173, by effective value voltage U
rMSpassing ratio integral controller carries out proportional integral adjustment, obtains controlled quentity controlled variable voltage U
v.
Well known to a person skilled in the art and be, proportional and integral controller is mainly PI and regulates.
Certainly, according to effective value voltage U
rMSobtain controlled quentity controlled variable voltage U
v, be not only confined to PI and regulate, can also regulate for P, PID regulates, and the present invention does not limit at this.
Preferably, see Fig. 4, step S12 specifically comprises:
S121, load current Iac is obtained the first filtered circuit I through the first filter
q;
Wherein, the filtering principle that the first filter adopts is:
s is complex variable, ω
nfor electrical network angular frequency
S122, load current Iac is obtained the second filtered circuit I through the second filter
d;
Wherein, the filtering principle that the second filter adopts is:
s is complex variable, ω
nfor electrical network angular frequency
S123, foundation the first filtered circuit I
qwith the second filtered circuit I
dobtain the first electric current I;
Concrete, see formula (3):
S124, discrete processes process according to described first filter and described second filter, obtain coefficient of dispersion K
3;
Wherein, coefficient of dispersion K is obtained
3need the process in conjunction with the first filter and the second filter discrete processes, and this process well known to a person skilled in the art, repeats no more herein.
S125, by the first electric current I and coefficient of dispersion K
3be multiplied, obtain the current amplitude I of load current Iac
o.
It should be noted that, the model of the first filter is different with the model of the second filter.
Concrete, utilize PSIM foundation voltage source inverter (this voltage source inverter is single-phase inverter) as shown in Figure 1, the no-load voltage ratio of isolating transformer T is 2:1.
Wherein, PSIM is the Simulation Application bag software trending towards field of power electronics and Motor Control Field, PSIM full name PowerSimulation.
See Fig. 5, the oscillogram of a kind of linear load and rectifier load electric current and extraction waveform thereof disclosed in the embodiment of the present invention, can find out, the application proposes magnitude extraction method when sinusoidal current, very fast (rise time 3.5ms) can obtain stable amplitude; When rectifier load, namely also more accurately amplitude can be extracted during current non-linear.
See Fig. 6, a kind of oscillogram of feedfoward control transformer primary secondary voltage disclosed in the embodiment of the present invention, emulation arranges the given 200V of voltage effective value, secondary voltage 100V time unloaded, equivalent resistance R=0.6W, as shown in the figure, extracts load-current feedforward according to the application, voltage fluctuation little (100.9V ~ 105.9V) during the switching load of isolating transformer secondary, stable output.
See Fig. 7, a kind of oscillogram of not carrying out feedforward transformer primary secondary voltage waveform disclosed in the embodiment of the present invention, when not adding load-current feedforward, voltage has larger falling (voltage reduces to 90.5V), and visible the application proposes load current compensation, has good control effects to the given control method compensating feedforward of effective value.
Corresponding with said method embodiment, the invention also discloses a kind of control device of voltage source inverter.
See Fig. 8, a kind of structural representation of control device of voltage source inverter disclosed in the embodiment of the present invention, control device is applied to voltage source inverter (specifically see Fig. 1),
Control device comprises: the first acquiring unit 81, second acquisition unit 82, equivalent unit 83, quadrature unit 84, first revision unit 85, second revises unit 86, the 3rd acquiring unit 87 and the 3rd revision unit 88;
First acquiring unit 81, for obtaining the load current Iac of voltage source inverter;
Wherein, the actual loading electric current of voltage source inverter is Ia, but due to reasons such as measure errors, causes the load current obtained to be Iac.
Second acquisition unit 82, for obtaining the current amplitude I of load current Iac
o;
Equivalent unit 83, by the secondary internal resistance of described isolating transformer equivalence to the former limit of described isolating transformer, obtains equivalent former limit internal resistance K
1;
Wherein, K
1acquisition process, see formula (1):
Wherein, R' is equiva lent impedance after voltage source inverter conversion, and SL is the reactor transfer function ignoring internal resistance, K
2for feed-forward coefficients, K
pWMfor inverter bridge equivalent gain.
Quadrature unit 84, for by current amplitude I
owith equivalence former limit internal resistance K
1be multiplied, obtain feedback voltage;
First revision unit 85, for the given voltage U by described feedback voltage and described voltage source inverter
rbe added, to described given voltage U
rcarry out first time revision, obtain the given voltage U of the first revision
r';
Second revision unit 86, for no-load voltage ratio and the modulation system of foundation isolating transformer T, to the given voltage U of the first revision
r' carry out second time revision, obtain the given voltage of the second revision;
Well known to a person skilled in the art and be, according to the no-load voltage ratio of isolating transformer T and the relation of modulation system, can feed-forward coefficients K be obtained
2, by the given voltage U of the first revision
r' and feed-forward coefficients K
2be multiplied, the given voltage of the second revision can be obtained, thus realize the feedfoward control to voltage source inverter.
3rd acquiring unit 87, for obtaining the controlled quentity controlled variable voltage U of described voltage source inverter
v;
3rd revision unit 88, for revising given voltage and described controlled quentity controlled variable voltage U by described second
vbe added, described controlled quentity controlled variable voltage revised, obtains revised described controlled quentity controlled variable voltage U
v.
In summary it can be seen, the control device of a kind of voltage source inverter provided by the invention, first obtain the load current Iac of voltage source inverter, then load current Iac is changed into feedback voltage, by the controlled quentity controlled variable voltage U by feedback voltage and voltage source inverter
vbe added, realize controlled quentity controlled variable voltage U
vrevision, secondary current due to isolating transformer equals the load current Iac of voltage source inverter, so, achieve the control to isolating transformer secondary voltage, improve the dynamic response of voltage source inverter, effectively reduce load Z disturbance to the impact of voltage source inverter, thus ensure that voltage source inverter exports constant voltage.
The present embodiment can also comprise: control unit 89
Control unit 89, produces pulse width modulated waveform, to drive the inverter operation of described voltage source inverter for controlling revised controlled quentity controlled variable voltage.
Concrete, control revised described controlled quentity controlled variable voltage and produce PWM waveform by algorithm, thus drive the inverter operation of described voltage source inverter.
PWM switching device and inverter transfer function are
sL is the reactor transfer function ignoring internal resistance, and R' is equiva lent impedance after voltage source inverter conversion, K
pWMfor inverter bridge equivalent gain.
Preferably, see Fig. 9, the structural representation of the 3rd acquiring unit in a kind of Fig. 8 disclosed in the embodiment of the present invention, the 3rd acquiring unit 87 comprises: first obtains subelement 871, first computation subunit 872 and process subelement 873;
First obtains subelement 871, for obtaining the original edge voltage U of described isolating transformer
p;
First computation subunit 872, for calculating original edge voltage U
peffective value voltage U
rMS;
Concrete, by original edge voltage U
pobtain effective value voltage U
rMSsee formula (2):
Wherein, T is power frequency period.
Process subelement 873, for by effective value voltage U
rMSpassing ratio integral controller carries out proportional integral adjustment, obtains controlled quentity controlled variable voltage U
v.
Preferably, see Figure 10, the structural representation of second acquisition unit in a kind of Fig. 8 disclosed in the embodiment of the present invention, second acquisition unit 82 comprises: the first filtering subelement 821, second filtering subelement 822, first process subelement 823, second processes subelement 824 and the 3rd process subelement 825;
First filtering subelement 821, for obtaining the first filtered circuit I by load current Iac through the first filter
q;
Second filtering subelement 822, for obtaining the second filtered circuit I by load current Iac through the second filter
d;
First process subelement 823, for foundation the first filtered circuit I
qwith the second filtered circuit I
dobtain the first electric current I;
Second process subelement 824, for the discrete processes process according to described first filter and described second filter, obtains coefficient of dispersion K
3;
3rd process subelement 825, for by the first electric current I and coefficient of dispersion K
3be multiplied, obtain the current amplitude I of load current Iac
o.
Wherein, the model of the first filter is different with the model of the second filter.
It should be noted that, the operation principle of each part in the control device of voltage source inverter provided by the invention, specifically see embodiment of the method, repeats no more herein.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a control method for voltage source inverter, is characterized in that, is applied to voltage source inverter, has isolating transformer in described voltage source inverter, and described control method comprises:
Obtain the load current of described voltage source inverter;
Obtain the current amplitude of described load current;
By the secondary internal resistance of described isolating transformer equivalence to the former limit of described isolating transformer, obtain equivalent former limit internal resistance;
Described current amplitude is multiplied with described equivalence former limit internal resistance, obtains feedback voltage;
Described feedback voltage is added with the given voltage of described voltage source inverter, first time revision is carried out to described given voltage, obtains the given voltage of the first revision;
According to no-load voltage ratio and the modulation system of described isolating transformer, second time revision is carried out to the given voltage of described first revision, obtains the given voltage of the second revision;
Obtain the controlled quentity controlled variable voltage of described voltage source inverter;
The given voltage of described second revision is added with described controlled quentity controlled variable voltage, described controlled quentity controlled variable voltage is revised, obtains revised described controlled quentity controlled variable voltage.
2. control method according to claim 1, is characterized in that, the controlled quentity controlled variable voltage of the described voltage source inverter of described acquisition comprises:
Obtain the original edge voltage of described isolating transformer;
Calculate the effective value voltage of described original edge voltage;
Described effective value voltage passing ratio integral controller is carried out proportional integral adjustment, obtains described controlled quentity controlled variable voltage.
3. control method according to claim 1, is characterized in that, the current amplitude of the described load current of described acquisition comprises:
Described load current is obtained the first filtered circuit through the first filter;
Described load current is obtained the second filtered circuit through the second filter;
The first electric current is obtained according to described first filtered circuit and described second filtered circuit;
According to the discrete processes process of described first filter and described second filter, obtain coefficient of dispersion;
Described first electric current is multiplied with described coefficient of dispersion, obtains the current amplitude of described load current.
4. control method according to claim 3, is characterized in that, the model of described first filter is different with the model of described second filter.
5. control method according to claim 1, is characterized in that, also comprises:
Control revised described controlled quentity controlled variable voltage and produce pulse width modulated waveform, to drive the inverter operation of described voltage source inverter.
6. the control device of a voltage source inverter, it is characterized in that, be applied to voltage source inverter, have isolating transformer in described voltage source inverter, described control device comprises: the first acquiring unit, second acquisition unit, equivalent unit, quadrature unit, the first revision unit, the second revision unit, the 3rd acquiring unit and the 3rd revision unit;
Described first acquiring unit, for obtaining the load current of described voltage source inverter;
Described second acquisition unit, for obtaining the current amplitude of described load current;
Described equivalent unit, for the secondary internal resistance of described isolating transformer equivalence being arrived the former limit of described isolating transformer, obtains equivalent former limit internal resistance;
Described quadrature unit, for being multiplied with described equivalence former limit internal resistance by described current amplitude, obtains feedback voltage;
Described first revision unit, for being added with the given voltage of described voltage source inverter by described feedback voltage, carrying out first time revision to described given voltage, obtaining the given voltage of the first revision;
Described second revision unit, for according to the no-load voltage ratio of described isolating transformer and modulation system, carries out second time to the given voltage of described first revision and revises, obtain the given voltage of the second revision;
Described 3rd acquiring unit, for obtaining the controlled quentity controlled variable voltage of described voltage source inverter;
Described 3rd revision unit, for being added with the controlled quentity controlled variable voltage of described voltage source inverter by the given voltage of described second revision, revising described controlled quentity controlled variable voltage, obtaining revised described controlled quentity controlled variable voltage.
7. control device according to claim 6, is characterized in that, described 3rd acquiring unit comprises: first obtains subelement, the first computation subunit and process subelement;
Described first obtains subelement, for obtaining the original edge voltage of described isolating transformer;
Described first computation subunit, for calculating the effective value voltage of described original edge voltage;
Described process subelement, for described effective value voltage passing ratio integral controller is carried out proportional integral adjustment, obtains described controlled quentity controlled variable voltage.
8. control device according to claim 6, is characterized in that, described second acquisition unit comprises: the first filtering subelement, the second filtering subelement, the first process subelement, the second process subelement and the 3rd process subelement;
Described first filtering subelement, for obtaining the first filtered circuit by described load current through the first filter;
Described second filtering subelement, for obtaining the second filtered circuit by described load current through the second filter;
Described first process subelement, for obtaining the first electric current according to described first filtered circuit and described second filtered circuit;
Described second process subelement, for the discrete processes process according to described first filter and described second filter, obtains coefficient of dispersion;
Described 3rd process subelement, for being multiplied with described coefficient of dispersion by described first electric current, obtains the current amplitude of described load current.
9. control device according to claim 8, is characterized in that, the model of described first filter is different with the model of described second filter.
10. control device according to claim 6, is characterized in that, also comprises:
Control unit, produces pulse width modulated waveform, to drive the inverter operation of described voltage source inverter for controlling revised described controlled quentity controlled variable voltage.
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