CN103607128A - Control method and control device of voltage source inverter - Google Patents

Control method and control device of voltage source inverter Download PDF

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Publication number
CN103607128A
CN103607128A CN201310655387.XA CN201310655387A CN103607128A CN 103607128 A CN103607128 A CN 103607128A CN 201310655387 A CN201310655387 A CN 201310655387A CN 103607128 A CN103607128 A CN 103607128A
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voltage
source inverter
voltage source
revision
subelement
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CN103607128B (en
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李俊
潘年安
张兴
陶磊
汪东林
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Sungrow Power Supply Co Ltd
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Sungrow Power Supply Co Ltd
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Abstract

The invention provides a control method and a control device of a voltage source inverter. The control method comprises the following steps: firstly acquiring a load current of the voltage source inverter, then converting the load current to a feedback voltage, adding the feedback voltage to the controlled quantity voltage of the voltage source inverter, and modifying the controlled quantity voltage. Since the secondary side current of an isolation transformer is identical to the load current of the voltage source inverter, the control of the secondary side voltage of the isolation transformer is realized, the dynamic response of the voltage source inverter is improved, the influence of the load disturbance on the voltage source inverter can be effectively reduced, and the voltage source inverter is enabled to output the constant voltage.

Description

A kind of control method of voltage source inverter and control device
Technical field
The present invention relates to voltage source inverter technical field, more particularly, relate to a kind of control method and control device of voltage source inverter.
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 the secondary switching load in isolation transformation, by causing, the voltage fluctuation of secondary output 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 processing to voltage source inverter, could meet instructions for use.Therefore, how guaranteeing 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, thereby guarantee that voltage source inverter exports constant voltage.
A control method for voltage source inverter, is applied to voltage source inverter, in described voltage source inverter, has isolating transformer, and described control method comprises:
Obtain the load current of described voltage source inverter;
Obtain the current amplitude of described load current;
Former limit by the secondary internal resistance equivalence of described isolating transformer to described isolating transformer, obtains equivalent former limit internal resistance;
Described current amplitude and described equivalence former limit internal resistance are multiplied each other, obtain feedback voltage;
The given voltage of described feedback voltage and described voltage source inverter is added, described given voltage is revised for the first time, obtain the given voltage of the first revision;
According to no-load voltage ratio and the modulation system of described isolating transformer, the given voltage of described the first revision is revised for the second time, obtain the given voltage of the second revision;
Obtain the controlled quentity controlled variable voltage of described voltage source inverter;
Described the second given voltage of revision and described controlled quentity controlled variable voltage are added, described controlled quentity controlled variable voltage is revised, obtain revised described controlled quentity controlled variable voltage.
Preferably, the controlled quentity controlled variable voltage that obtains described voltage source inverter described in 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 to proportional integral adjusting, obtain described controlled quentity controlled variable voltage.
Preferably, the current amplitude that obtains described load current described in comprises:
Described load current is obtained to the first filtered circuit through the first filter;
Described load current is obtained to the second filtered circuit through the second filter;
According to described the first filtered circuit and described the second filtered circuit, obtain the first electric current;
Discrete processes process according to described the first filter and described the second filter, obtains coefficient of dispersion;
Described the first electric current and described coefficient of dispersion are multiplied each other, obtain the current amplitude of described load current.
Preferably, the model of described the first filter is different with the model of described the 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, in described voltage source inverter, have isolating transformer, 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 the 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 former limit to described isolating transformer by the secondary internal resistance equivalence of described isolating transformer, obtains equivalent former limit internal resistance;
Described quadrature unit, for described current amplitude and described equivalence former limit internal resistance are multiplied each other, obtains feedback voltage;
Described the first revision unit, for the given voltage of described feedback voltage and described voltage source inverter is added, revises for the first time to described given voltage, obtains the given voltage of the first revision;
Described the second revision unit, for no-load voltage ratio and the modulation system according to described isolating transformer, revises for the second time to the given voltage of described the first revision, obtains the given voltage of the second revision;
Described the 3rd acquiring unit, for obtaining the controlled quentity controlled variable voltage of described voltage source inverter;
Described the 3rd revision unit, for the controlled quentity controlled variable voltage of described the second given voltage of revision and described voltage source inverter is added, revises described controlled quentity controlled variable voltage, obtains revised described controlled quentity controlled variable voltage.
Preferably, described the 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 the first computation subunit, for calculating the effective value voltage of described original edge voltage;
Described processing subelement, for described effective value voltage passing ratio integral controller is carried out to proportional integral adjusting, obtains described controlled quentity controlled variable voltage.
Preferably, described second acquisition unit comprises: the first filtering subelement, the second filtering subelement, first are processed subelement, second and processed subelement and the 3rd processing subelement;
Described the first filtering subelement, for obtaining the first filtered circuit by described load current through the first filter;
Described the second filtering subelement, for obtaining the second filtered circuit by described load current through the second filter;
Described first processes subelement, for obtaining the first electric current according to described the first filtered circuit and described the second filtered circuit;
Described second processes subelement, and the discrete processes process for according to described the first filter and described the second filter, obtains coefficient of dispersion;
The described the 3rd processes subelement, for described the first electric current and described coefficient of dispersion are multiplied each other, obtains the current amplitude of described load current.
Preferably, the model of described the first filter is different with the model of described the second filter.
Preferably, also comprise:
Control unit, produces pulse width modulated waveform for controlling revised described controlled quentity controlled variable voltage, to drive the inverter operation of described voltage source inverter.
From above-mentioned technical scheme, can find out, the invention provides a kind of control method and control device of voltage source inverter, first obtain the load current of voltage source inverter, then load current is changed into feedback voltage, by the controlled quentity controlled variable voltage of feedback voltage and voltage source inverter is added, the revision of realization to controlled quentity controlled variable voltage, because the secondary current of isolating transformer equals the load current of voltage source inverter, so, realized the control to isolating transformer secondary voltage, improved the dynamic response of voltage source inverter, effectively reduced the impact of load disturbance on voltage source inverter, thereby guaranteed 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, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the disclosed a kind of voltage source inverter of the embodiment of the present invention;
Fig. 2 is the flow chart of the control method of the disclosed a kind of voltage source inverter of the embodiment of the present invention;
Fig. 3 is the flow chart of the method for the disclosed a kind of controlled quentity controlled variable voltage that obtains voltage source inverter of the embodiment of the present invention;
Fig. 4 is the flow chart of the method for the disclosed a kind of current amplitude that obtains load current of the embodiment of the present invention;
Fig. 5 is the disclosed a kind of linear load of the embodiment of the present invention and rectifier load electric current and the oscillogram of extracting waveform thereof;
Fig. 6 is the oscillogram of the disclosed a kind of feedfoward control transformer primary secondary voltage of the embodiment of the present invention;
Fig. 7 is the oscillogram of the disclosed a kind of transformer primary secondary voltage waveform that feedovers of the embodiment of the present invention;
Fig. 8 is the structural representation of the control device of the disclosed a kind of voltage source inverter of the embodiment of the present invention;
Fig. 9 is the structural representation of the 3rd acquiring unit in the disclosed a kind of Fig. 8 of the embodiment of the present invention;
Figure 10 is the structural representation of second acquisition unit in the disclosed a kind of Fig. 8 of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Referring to 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, capacitor C, voltage sensor VT, isolating transformer T, current sensor CT, isolating transformer T equivalent internal resistance convert secondary secondary resistance R, load Z, be added in the voltage U on load Z 1and by 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 respectively the former limit of the positive plate of capacitor C, the input of voltage sensor VT and isolating transformer T;
The negative plate of capacitor C connects respectively the former limit of the input of the 4th switching device S4, the output of voltage sensor VT and isolating transformer T;
Current sensor CT, secondary resistance R and load Z are connected in series in the secondary of isolating transformer T.
Referring to 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 referring to Fig. 1, and control method comprises step:
S11, obtain 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, causing the load current obtaining is Iac.
S12, obtain the current amplitude I of load current Iac o;
S13, the former limit by the secondary internal resistance equivalence of described isolating transformer to described isolating transformer, obtain equivalent former limit internal resistance K 1;
Wherein, K 1acquisition process referring to formula (1):
K 1 = ( R ′ + SL ) K 2 K PWM - - - ( 1 )
Wherein, R ' is the rear equiva lent impedance of voltage source inverter conversion, and SL is the reactor transfer function of ignoring internal resistance, K 2for feed-forward coefficients, K pWMfor inverter bridge equivalent gain.
S14, by current amplitude I owith the former limit internal resistance of equivalence K 1multiply each other, 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 rrevise for the first time, obtain the given voltage U of the first revision r';
S16, according to no-load voltage ratio and the modulation system of isolating transformer T, to the given voltage U of the first revision r' revise for the second time, obtain the given voltage of the second revision;
Well known to a person skilled in the art to be, according to the no-load voltage ratio of isolating transformer T and the relation of modulation system, can obtain feed-forward coefficients K 2, by the given voltage U of the first revision r' with feed-forward coefficients K 2multiply each other, can obtain the given voltage of the second revision, thereby 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 the second revision given voltage and described controlled quentity controlled variable voltage U vbe added, described controlled quentity controlled variable voltage is revised, obtain 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 the load current Iac that obtains voltage source inverter, then changes into feedback voltage by load current Iac, by by the controlled quentity controlled variable voltage U of feedback voltage and voltage source inverter vbe added, realize controlled quentity controlled variable voltage U vrevision, because the secondary current of isolating transformer equals the load current Iac of voltage source inverter, so, realized the control to isolating transformer secondary voltage, improved the dynamic response of voltage source inverter, effectively reduced the impact of load Z disturbance on voltage source inverter, thereby guaranteed 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 (Pulse Width Modulation, 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, thereby drive the inverter operation of described voltage source inverter.
PWM switching device and inverter transfer function are sL is the reactor transfer function of ignoring internal resistance, and R ' is the rear equiva lent impedance of voltage source inverter conversion, K pWMfor inverter bridge equivalent gain.
Preferably, referring to 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, referring to formula (2):
U RMS = 1 T ∫ 0 T U p 2 dt - - - ( 2 )
Wherein, T is power frequency period.
S173, by effective value voltage U rMSpassing ratio integral controller carries out proportional integral adjusting, controlled amount voltage U v.
Well known to a person skilled in the art to be, proportional and integral controller is mainly PI and regulates.
Certainly, according to effective value voltage U rMScontrolled amount voltage U v, be not only confined to PI and regulate, can also regulate for P, PID adjusting etc., the present invention does not limit at this.
Preferably, referring to Fig. 4, step S12 specifically comprises:
S121, load current Iac is obtained to the first filtered circuit I through the first filter q;
Wherein, the filtering principle that the first filter adopts is:
Figure BDA0000432099090000072
s is complex variable, ω nfor electrical network angular frequency
S122, load current Iac is obtained to the second filtered circuit I through the second filter d;
Wherein, the filtering principle that the second filter adopts is:
Figure BDA0000432099090000081
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, referring to formula (3):
I = I q 2 + I d 2 - - - ( 3 )
The discrete processes process of S124, described the first filter of foundation and described the second filter, obtains coefficient of dispersion K 3;
Wherein, obtain coefficient of dispersion K 3need to be in conjunction with the process of the first filter and the second filter discrete processes, and this process is 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 3multiply each other, 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 to set up 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 that trends towards field of power electronics and Motor Control Field, PSIM full name Power Simulation.
Referring to Fig. 5, oscillogram for the disclosed a kind of linear load of the embodiment of the present invention and rectifier load electric current and extraction waveform thereof, can find out, the application proposes magnitude extraction method when sinusoidal current, and very fast (rise time 3.5ms) obtains stable amplitude; When rectifier load, also can more accurately extract amplitude during current non-linear.
Referring to Fig. 6, the oscillogram of the disclosed a kind of feedfoward control transformer primary secondary voltage of the embodiment of the present invention, emulation arranges the given 200V of voltage effective value, secondary voltage 100V when 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 load of isolating transformer secondary switching, stable output.
Referring to Fig. 7, the oscillogram of the disclosed a kind of transformer primary secondary voltage waveform that feedovers of the embodiment of the present invention, when not adding load-current feedforward, voltage has larger falling (voltage is reduced to 90.5V), and visible the application proposes load current compensation, the given control method that compensates feedforward of effective value is had to good control effect.
Embodiment is corresponding with said method, the invention also discloses a kind of control device of voltage source inverter.
Referring to Fig. 8, the structural representation of the control device of the disclosed a kind of voltage source inverter of the embodiment of the present invention, control device is applied to voltage source inverter (specifically referring to Fig. 1),
Control device comprises: the first acquiring unit 81, second acquisition unit 82, equivalent unit 83, quadrature unit 84, the first revision unit 85, the second revision unit 86, the 3rd acquiring unit 87 and the 3rd revision unit 88;
The 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, causing the load current obtaining is Iac.
Second acquisition unit 82, for obtaining the current amplitude I of load current Iac o;
Equivalent unit 83, the former limit by the secondary internal resistance equivalence of described isolating transformer to described isolating transformer, obtains equivalent former limit internal resistance K 1;
Wherein, K 1acquisition process, referring to formula (1):
K 1 = ( R ′ + SL ) K 2 K PWM - - - ( 1 )
Wherein, R ' is the rear equiva lent impedance of voltage source inverter conversion, and SL is the reactor transfer function of ignoring internal resistance, K 2for feed-forward coefficients, K pWMfor inverter bridge equivalent gain.
Quadrature unit 84, for by current amplitude I owith the former limit internal resistance of equivalence K 1multiply each other, obtain feedback voltage;
The first revision unit 85, for by the given voltage U of described feedback voltage and described voltage source inverter rbe added, to described given voltage U rrevise for the first time, obtain the given voltage U of the first revision r';
The second revision unit 86, for the no-load voltage ratio according to isolating transformer T and modulation system, to the given voltage U of the first revision r' revise for the second time, obtain the given voltage of the second revision;
Well known to a person skilled in the art to be, according to the no-load voltage ratio of isolating transformer T and the relation of modulation system, can obtain feed-forward coefficients K 2, by the given voltage U of the first revision r' with feed-forward coefficients K 2multiply each other, can obtain the given voltage of the second revision, thereby realize the feedfoward control to voltage source inverter.
The 3rd acquiring unit 87, for obtaining the controlled quentity controlled variable voltage U of described voltage source inverter v;
The 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 is revised, obtain 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 the load current Iac that obtains voltage source inverter, then changes into feedback voltage by load current Iac, by by the controlled quentity controlled variable voltage U of feedback voltage and voltage source inverter vbe added, realize controlled quentity controlled variable voltage U vrevision, because the secondary current of isolating transformer equals the load current Iac of voltage source inverter, so, realized the control to isolating transformer secondary voltage, improved the dynamic response of voltage source inverter, effectively reduced the impact of load Z disturbance on voltage source inverter, thereby guaranteed that voltage source inverter exports constant voltage.
The present embodiment can also comprise: control unit 89
Control unit 89, produces pulse width modulated waveform for controlling revised controlled quentity controlled variable voltage, 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, thereby drive the inverter operation of described voltage source inverter.
PWM switching device and inverter transfer function are sL is the reactor transfer function of ignoring internal resistance, and R ' is the rear equiva lent impedance of voltage source inverter conversion, K pWMfor inverter bridge equivalent gain.
Preferably, referring to Fig. 9, the structural representation of the 3rd acquiring unit in the disclosed a kind of Fig. 8 of the embodiment of the present invention, the 3rd acquiring unit 87 comprises: first obtains subelement 871, the first computation subunit 872 and process subelement 873;
First obtains subelement 871, for obtaining the original edge voltage U of described isolating transformer p;
The 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 rMSreferring to formula (2):
U RMS = 1 T ∫ 0 T U p 2 dt - - - ( 2 )
Wherein, T is power frequency period.
Process subelement 873, for by effective value voltage U rMSpassing ratio integral controller carries out proportional integral adjusting, controlled amount voltage U v.
Preferably, referring to Figure 10, the structural representation of second acquisition unit in the disclosed a kind of Fig. 8 of the embodiment of the present invention, second acquisition unit 82 comprises: the first filtering subelement 821, the second filtering subelement 822, first are processed subelement 823, second and processed subelement 824 and the 3rd processing subelement 825;
The first filtering subelement 821, for obtaining the first filtered circuit I by load current Iac through the first filter q;
The second filtering subelement 822, for obtaining the second filtered circuit I by load current Iac through the second filter d;
First processes subelement 823, for foundation the first filtered circuit I qwith the second filtered circuit I dobtain the first electric current I;
Second processes subelement 824, and the discrete processes process for according to described the first filter and described the second filter, obtains coefficient of dispersion K 3;
The 3rd processes subelement 825, for by the first electric current I and coefficient of dispersion K 3multiply each other, 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 referring to 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 each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment 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, in described voltage source inverter, has isolating transformer, and described control method comprises:
Obtain the load current of described voltage source inverter;
Obtain the current amplitude of described load current;
Former limit by the secondary internal resistance equivalence of described isolating transformer to described isolating transformer, obtains equivalent former limit internal resistance;
Described current amplitude and described equivalence former limit internal resistance are multiplied each other, obtain feedback voltage;
The given voltage of described feedback voltage and described voltage source inverter is added, described given voltage is revised for the first time, obtain the given voltage of the first revision;
According to no-load voltage ratio and the modulation system of described isolating transformer, the given voltage of described the first revision is revised for the second time, obtain the given voltage of the second revision;
Obtain the controlled quentity controlled variable voltage of described voltage source inverter;
Described the second given voltage of revision and described controlled quentity controlled variable voltage are added, described controlled quentity controlled variable voltage is revised, obtain revised described controlled quentity controlled variable voltage.
2. control method according to claim 1, is characterized in that, described in obtain described voltage source inverter controlled quentity controlled variable voltage comprise:
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 to proportional integral adjusting, obtain described controlled quentity controlled variable voltage.
3. control method according to claim 1, is characterized in that, described in obtain described load current current amplitude comprise:
Described load current is obtained to the first filtered circuit through the first filter;
Described load current is obtained to the second filtered circuit through the second filter;
According to described the first filtered circuit and described the second filtered circuit, obtain the first electric current;
Discrete processes process according to described the first filter and described the second filter, obtains coefficient of dispersion;
Described the first electric current and described coefficient of dispersion are multiplied each other, obtain the current amplitude of described load current.
4. control method according to claim 3, is characterized in that, the model of described the first filter is different with the model of described the 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, in described voltage source inverter, have isolating transformer, 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 the 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 former limit to described isolating transformer by the secondary internal resistance equivalence of described isolating transformer, obtains equivalent former limit internal resistance;
Described quadrature unit, for described current amplitude and described equivalence former limit internal resistance are multiplied each other, obtains feedback voltage;
Described the first revision unit, for the given voltage of described feedback voltage and described voltage source inverter is added, revises for the first time to described given voltage, obtains the given voltage of the first revision;
Described the second revision unit, for no-load voltage ratio and the modulation system according to described isolating transformer, revises for the second time to the given voltage of described the first revision, obtains the given voltage of the second revision;
Described the 3rd acquiring unit, for obtaining the controlled quentity controlled variable voltage of described voltage source inverter;
Described the 3rd revision unit, for the controlled quentity controlled variable voltage of described the second given voltage of revision and described voltage source inverter is added, revises described controlled quentity controlled variable voltage, obtains revised described controlled quentity controlled variable voltage.
7. control device according to claim 6, is characterized in that, described the 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 the first computation subunit, for calculating the effective value voltage of described original edge voltage;
Described processing subelement, for described effective value voltage passing ratio integral controller is carried out to proportional integral adjusting, 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, first are processed subelement, second and processed subelement and the 3rd processing subelement;
Described the first filtering subelement, for obtaining the first filtered circuit by described load current through the first filter;
Described the second filtering subelement, for obtaining the second filtered circuit by described load current through the second filter;
Described first processes subelement, for obtaining the first electric current according to described the first filtered circuit and described the second filtered circuit;
Described second processes subelement, and the discrete processes process for according to described the first filter and described the second filter, obtains coefficient of dispersion;
The described the 3rd processes subelement, for described the first electric current and described coefficient of dispersion are multiplied each other, obtains the current amplitude of described load current.
9. control device according to claim 8, is characterized in that, the model of described the first filter is different with the model of described the second filter.
10. control device according to claim 6, is characterized in that, also comprises:
Control unit, produces pulse width modulated waveform for controlling revised described controlled quentity controlled variable voltage, to drive the inverter operation of described voltage source inverter.
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