CN114844383B - Voltage control method, system and device based on load current feedforward - Google Patents

Voltage control method, system and device based on load current feedforward Download PDF

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Publication number
CN114844383B
CN114844383B CN202210513817.3A CN202210513817A CN114844383B CN 114844383 B CN114844383 B CN 114844383B CN 202210513817 A CN202210513817 A CN 202210513817A CN 114844383 B CN114844383 B CN 114844383B
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inverter
voltage
output
current
load current
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CN114844383A (en
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全相军
黄仁志
王子辰
孙天奎
侯凯
宋飞
王俊辉
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Southeast University
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
State Grid Electric Power Research Institute
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Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
State Grid Electric Power Research Institute
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The disclosure belongs to the field of inverter voltage control, and in particular relates to a voltage control method, a voltage control system and a voltage control device based on load current feedforward, which comprise the following steps: establishing a mathematical model under a static coordinate system of the inverter, formulating an inverter zero steady-state error control strategy, and realizing zero output impedance design based on load current feedforward; compared with the traditional double-loop control, the load current differential feedforward is innovatively introduced, so that the output impedance of the inverter is always zero, and the output voltage of the inverter cannot be distorted under the working condition of the inverter with a nonlinear load.

Description

Voltage control method, system and device based on load current feedforward
Technical Field
The disclosure belongs to the field of inverter voltage control, and particularly relates to a voltage control method, system and device based on load current feedforward.
Background
The output voltage of a distributed system is typically dc, which is converted to ac by an inverter before being fed into the grid or applied to a load. The power delivered and used has certain standard requirements in terms of amplitude, frequency and waveform quality, which must be controlled prior to delivery. Meanwhile, the voltage at the output end of the inverter is greatly distorted by the nonlinear load which is more common in production and life, so that the stable output of electric energy is affected.
The existing suppression method is divided into designing proper element parameters from a harmonic source and effectively designing a controller to reduce the generation of harmonic; from the generated harmonics, filters are used, harmonic currents are absorbed, active compensation is performed on the harmonics, and the like.
Disclosure of Invention
In view of the shortcomings of the prior art, an object of the present disclosure is to provide a voltage control method based on load current feedforward, which solves the problem that an output voltage waveform generates larger distortion under the condition that an inverter is connected with a nonlinear load.
The purpose of the disclosure can be achieved by the following technical scheme:
The topological structure of the inverter comprises the inverter, wherein the input end of the inverter is connected with a direct current unit, the output end of the inverter is connected with a nonlinear load through a filter, and a load current feedforward transmission unit is arranged between the filter and the nonlinear load; the method comprises the following steps:
Constructing a relation between the output voltage, the input voltage reference and the output current of the inverter, and acquiring an equivalent output impedance relation of the inverter; setting the equivalent output impedance of the inverter to 0, and constructing a load current feedforward transfer function relation of a load current feedforward transfer unit;
The load current feed forward transfer function k f(s) is:
R f is parasitic resistance on inductance, L f filter inductance, k Pi is inverter current inner loop proportional control coefficient, s=σ+jω is complex parameter variable, called complex frequency;
By satisfying the load current feedforward transfer function relation of the load current feedforward transfer unit, the equivalent output impedance of the inverter is 0, and the harmonic wave of the input voltage of the inverter is reduced.
In some disclosures, building inverter output voltage and input voltage versus output current relationships is performed by building a mathematical model of the inverter.
In some disclosures, the mathematical model of the inverter is constructed in the form of complex frequency domain through kirchhoff voltage and current equations, coordinate transformation and laplace transformation.
In some disclosures, inverter voltage control includes: the voltage outer ring and the current inner ring voltage are used for constructing the relation between the output voltage and the input voltage of the inverter and the output current, and the output voltage of the inverter follows the given value of the voltage outer ring; the output current to the inverter follows the voltage outer loop set point.
In some disclosures, the voltage external bad controller adopts a proportional resonance method to control the output voltage of the inverter, and the output voltage of the inverter follows the given value of the voltage external ring to realize zero steady-state error control of the output voltage of the inverter.
In some disclosures, the current inner loop controller is used for controlling the phase current through the filter inductor by adopting a proportional control method, and the output current of the inverter follows the given value of the voltage outer loop to realize zero steady-state error control of the output current of the inverter.
In some disclosures, the relationship of inverter output voltage, input voltage reference, and output current:
uC＝G(s)uref(s)-Zo(s)il(s)
Wherein G(s) represents the transfer function of the output voltage with respect to the voltage control outer loop reference voltage:
z o(s) represents the transfer function of the output voltage versus the output current, i.e. the inverter equivalent output impedance:
k f(s) represents a load current feedforward transfer function, G u(s)、Gi(s) represents an inverter voltage controller and current controller transfer function, and k PWM represents an equivalent gain of an inverter PWM modulation link.
In a second aspect, in view of the shortcomings of the prior art, an object of the present disclosure is to provide a voltage control method based on load current feedforward, which solves the problem that an output voltage waveform generates a larger distortion under a nonlinear load condition of an inverter.
The topological structure of the inverter comprises the inverter, wherein the input end of the inverter is connected with a direct current unit, the output end of the inverter is connected with a nonlinear load through a filter, and a load current feedforward transmission unit is arranged between the filter and the nonlinear load; the method comprises the following steps:
constructing a mathematical model of the inverter by converting the kirchhoff voltage and current equation into a complex frequency domain form through coordinate transformation and Laplace transformation;
constructing a relation of inverter output voltage, input voltage reference and output current:
uC＝G(s)uref(s)-Zo(s)il(s)
Wherein G(s) represents the transfer function of the output voltage with respect to the voltage control outer loop reference voltage:
z o(s) represents the transfer function of the output voltage versus the output current, i.e. the inverter equivalent output impedance:
Setting the equivalent output impedance of the inverter to 0, and constructing a load current feedforward transfer function relation of a load current feedforward transfer unit;
The load current feed forward transfer function k f(s) is:
R f is parasitic resistance on inductance, L f filter inductance, k Pi is inverter current inner loop proportional control coefficient, s=σ+jω is complex parameter variable, called complex frequency;
By satisfying the load current feedforward transfer function relation of the load current feedforward transfer unit, the equivalent output impedance of the inverter is 0, and the harmonic wave of the input voltage of the inverter is reduced.
In a third aspect, in view of the shortcomings of the prior art, an object of the present disclosure is to provide a voltage control system based on load current feedforward, which solves the problem that an output voltage waveform generates a larger distortion under a condition that an inverter is connected with a nonlinear load.
The topological structure of the inverter comprises the inverter, wherein the input end of the inverter is connected with a direct current unit, the output end of the inverter is connected with a nonlinear load through a filter, and a load current feedforward transmission unit is arranged between the filter and the nonlinear load; the device is characterized by comprising the following modules:
and a model building module: constructing a mathematical model of the inverter by converting the kirchhoff voltage and current equation into a complex frequency domain form through coordinate transformation and Laplace transformation;
The relation processing module: constructing a relation of inverter output voltage, input voltage reference and output current:
uC＝G(s)uref(s)-Zo(s)il(s)
Wherein G(s) represents the transfer function of the output voltage with respect to the voltage control outer loop reference voltage:
z o(s) represents the transfer function of the output voltage versus the output current, i.e. the inverter equivalent output impedance:
A condition constraint module: setting the equivalent output impedance of the inverter to 0, and constructing a load current feedforward transfer function relation of a load current feedforward transfer unit;
And a comparison module: the load current feedforward transfer function relation of the load current feedforward transfer unit is satisfied.
In a fourth aspect, in view of the shortcomings of the prior art, an object of the present disclosure is to provide a voltage control device based on load current feedforward, which solves the problem that an output voltage waveform generates a larger distortion under a nonlinear load condition of an inverter.
The topological structure of the inverter comprises the inverter, wherein the input end of the inverter is connected with a direct current unit, the output end of the inverter is connected with a nonlinear load through a filter, and a load current feedforward transmission unit is arranged between the filter and the nonlinear load; the device is characterized by comprising the following modules:
Model building unit: constructing a mathematical model of the inverter by converting the kirchhoff voltage and current equation into a complex frequency domain form through coordinate transformation and Laplace transformation;
relationship processing unit: constructing a relation of inverter output voltage, input voltage reference and output current:
uC＝G(s)uref(s)-Zo(s)il(s)
Wherein G(s) represents the transfer function of the output voltage with respect to the voltage control outer loop reference voltage:
z o(s) represents the transfer function of the output voltage versus the output current, i.e. the inverter equivalent output impedance:
condition constraint unit: setting the equivalent output impedance of the inverter to 0, and constructing a load current feedforward transfer function relation of a load current feedforward transfer unit;
comparison unit: the load current feedforward transfer function relation of the load current feedforward transfer unit is satisfied.
The present disclosure has at least one of the following beneficial effects:
1. according to the voltage control method of the inverter zero output impedance, the voltage controller adopts proportional resonance control, so that zero steady-state error control of output voltage is realized;
2. compared with the traditional double-loop control, the voltage control method for the zero output impedance of the inverter provided by the disclosure creatively introduces load current differential feedforward, so that the output impedance of the inverter is always zero, and therefore, the output voltage of the inverter cannot be distorted under the working condition of the inverter with a nonlinear load.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described, and it will be apparent to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is an inverter topology of the present disclosure;
FIG. 2 is an overall control block diagram of the present disclosure;
fig. 3 is a block diagram of a load current feed forward design of the present disclosure.
Detailed Description
The following description of the technical solutions in the embodiments of the present disclosure will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only some embodiments of the present disclosure, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments in this disclosure without inventive faculty, are intended to fall within the scope of this disclosure.
As shown in fig. 2, a three-phase bridge inverter mathematical model is constructed under a static coordinate system, output voltage zero steady-state error control is realized by adopting proportional resonance control, an inverter equivalent output impedance expression is deduced on the basis, and load current differential feedforward is innovatively introduced, so that the output impedance is always zero.
The method comprises the following steps:
step 1, establishing a mathematical model of an inverter under a static coordinate system
As shown in fig. 1, a three-phase bridge circuit topology is selected, a high-frequency switching device capable of being turned off and an LC type output filter are configured, and an inverter mathematical model is established;
In fig. 1, S 1、S2、S3、S4、S5、S6 is an IGBT switching device, forming a three-phase inverter bridge, the bridge arm voltage is denoted by v ca、vcb、vcc, one side of the inverter bridge is connected to a dc voltage input, the other side is connected to an output filter, L f、Cf is an LC filter inductance and a capacitor, R f is a parasitic resistance on the inductance, the current flowing through the filter inductance is i La、iLb、iLc, the voltage at two ends of the filter capacitor is u Ca、uCb、uCc, the other end of the filter is connected to a load or a power grid, i la、ilb、ilc is the current flowing to the load, and kirchhoff voltage and current equations are written to the output side of the inverter under a three-phase stationary coordinate system (abc coordinate system):
Consider the following CLARK coordinate transformation:
f αβ、fabc is a control variable in a two-phase stationary coordinate system, a three-phase stationary coordinate system.
Each variable is transformed into a two-phase stationary coordinate system (alpha beta coordinate system) through CLARK transformation so as to avoid the complex decoupling control caused by the separate control of three-phase variables under a general coordinate system and the PARK transformation into a two-phase rotating coordinate system (dq coordinate system):
in the two-phase stationary coordinate system, v cα、vcβ is the bridge arm voltage, i Lα、iLβ is the current flowing through the filter inductance, u Cα、uCβ is the voltage across the filter capacitance, and i lα、ilβ is the current flowing to the load.
Converted into a complex frequency domain form:
s=σ+jω is a complex parameter, called complex frequency, v αβ(s) in the complex frequency domain represents the bridge arm voltage, u Cαβ(s) is the voltage across the filter capacitor, i Lαβ(s) is the current through the filter inductor, and i lαβ(s) is the current to the load.
The equivalent circuit of the inverter under the two-phase stationary coordinate system can be obtained according to the formula (3).
Step2, formulating an inverter zero steady-state error control strategy
The inverter voltage control comprises a voltage outer ring controller and a current inner ring controller, wherein the voltage outer ring controller controls phase voltages at two ends of a capacitor, so that the inverter output voltage follows a given value of the voltage outer ring, and the current inner ring controller controls phase current flowing through a filter inductor, so that the inverter output current follows an output value of the voltage outer ring controller, namely a given value of the current inner ring controller, the inverter output characteristic can be improved, and the system dynamic response is accelerated;
Under an alpha beta coordinate system, the current and the current of each voltage are alternating current, the voltage outer loop controller adopts proportional resonance (Proportional resonance, PR) control to realize zero steady-state error control of output voltage, the current inner loop controller adopts proportional control, and complex frequency domain transfer functions of the two are as follows:
where k Pv、kRv is the proportionality coefficient and resonance coefficient of the proportionality resonance control, ω 0 is the central resonance angular frequency where the gain is maximum, and k Pi is the current inner loop proportionality control coefficient. And (3) according to the mathematical model of the inverter in the step (1), obtaining an inverter voltage control strategy under a two-phase static coordinate system, and realizing independent control of alpha and beta axes. On the basis, load current feedforward is added for output impedance adjustment, and a control block diagram is shown in fig. 2;
In fig. 2, G u(s)、Gi(s) is as described in equation (4), k PWM is an equivalent gain of the PWM modulation link, and k f(s) is a load current feedforward transfer function.
Step 3, realizing zero output impedance design based on load current feedforward
According to the voltage control strategy in the step 2, the equivalent output impedance of the inverter is obtained, and then a zero output impedance voltage control method based on load current feedforward is provided, which comprises the following steps:
first, the relation between the inverter output voltage and the input voltage reference and the output current is obtained:
uC＝G(s)uref(s)-Zo(s)il(s) (5)
Wherein G(s) represents the transfer function of the output voltage with respect to the voltage control outer loop reference voltage:
z o(s) represents the transfer function of the output voltage versus the output current, i.e. the inverter equivalent output impedance:
as can be seen from the observation formula (7), the equivalent output impedance of the inverter is related to the filter parameter and the control parameter, and the traditional method improves the output characteristic of the inverter and reduces the harmonic distortion of the output voltage under the nonlinear load condition by adjusting the control parameter and the feedforward gain coefficient of the load current proportion. In this patent, the equivalent output impedance is directly set to 0, and the obtained load current feedforward transfer function expression is:
Formula (8) is rewritable:
according to the formula (9), the load current feedforward adopted by the patent is added with a differential link besides the traditional proportional feedforward, and the zero-output impedance voltage control based on the load current feedforward is successfully realized. A block diagram of the design of the load current feed forward transfer function is shown in fig. 3.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing has shown and described the basic principles, principal features, and advantages of the present disclosure. It will be understood by those skilled in the art that the present disclosure is not limited to the embodiments described above, and that the embodiments and descriptions described herein are merely illustrative of the principles of the disclosure, and various changes and modifications may be made without departing from the spirit and scope of the disclosure, which are within the scope of the disclosure as claimed.

Claims (8)

1. The topological structure of the inverter comprises the inverter, wherein the input end of the inverter is connected with a direct current unit, the output end of the inverter is connected with a nonlinear load through a filter, and a load current feedforward transmission unit is arranged between the filter and the nonlinear load; the method is characterized by comprising the following steps of:
Constructing a relation between the output voltage, the input voltage reference and the output current of the inverter, and acquiring an equivalent output impedance relation of the inverter; setting the equivalent output impedance of the inverter to 0, and constructing a load current feedforward transfer function relation of a load current feedforward transfer unit;
Load current feedforward transfer function The method comprises the following steps: /(I)；
R f is parasitic resistance on inductance, L f filter inductance, k Pi is inverter current inner loop proportional control coefficient, s=σ+jω is complex parameter variable, called complex frequency;
The equivalent output impedance of the inverter is 0 by meeting the load current feedforward transfer function relation of the load current feedforward transfer unit, so that the harmonic wave of the input voltage of the inverter is reduced;
The inverter voltage control includes: the voltage outer ring and the current inner ring voltage are used for constructing the relation between the output voltage and the input voltage of the inverter and the output current, and the output voltage of the inverter follows the given value of the voltage outer ring; the output current of the inverter follows the given value of the voltage outer ring;
Inverter output voltage, input voltage reference, and output current relationship:
Wherein G(s) represents the transfer function of the output voltage with respect to the voltage control outer loop reference voltage:
z o(s) represents the transfer function of the output voltage versus the output current, i.e. the inverter equivalent output impedance:
k f (s) represents a load current feedforward transfer function, G u (s)、Gi (s) represents an inverter voltage controller and current controller transfer function, and k PWM represents an equivalent gain of an inverter PWM modulation link.
2. The voltage control method based on load current feedforward as recited in claim 1, wherein the inverter output voltage and the relation between the input voltage and the output current are constructed by modeling the inverter mathematical model.
3. The voltage control method based on load current feedforward as claimed in claim 2, wherein the mathematical model of the inverter is constructed in the form of complex frequency domain through kirchhoff voltage and current equation, coordinate transformation and laplace transformation.
4. The voltage control method based on load current feedforward of claim 1, including the voltage outer bad controller, the voltage outer bad controller adopts the proportion resonance method, control the inverter output voltage, follow the voltage outer ring given value to the inverter output voltage, realize the output voltage zero steady state error control of the inverter.
5. The voltage control method based on load current feedforward as claimed in claim 1, including a current inner loop controller, wherein the current inner loop controller adopts a proportional control method to control phase current through a filter inductor, and the output current of the inverter follows a voltage outer loop set value to realize zero steady state error control of the output current of the inverter.
6. The voltage control method based on the load current feedforward is characterized by comprising the following steps:
the topological structure of the inverter comprises the inverter, wherein the input end of the inverter is connected with the direct current unit, the output end of the inverter is connected with the nonlinear load through a filter, and a load current feedforward transfer unit is arranged between the filter and the nonlinear load;
constructing a mathematical model of the inverter by converting the kirchhoff voltage and current equation into a complex frequency domain form through coordinate transformation and Laplace transformation;
constructing a relation of inverter output voltage, input voltage reference and output current:
Wherein G(s) represents the transfer function of the output voltage with respect to the voltage control outer loop reference voltage:
z o(s) represents the transfer function of the output voltage versus the output current, i.e. the inverter equivalent output impedance:
；
Setting the equivalent output impedance of the inverter to 0, and constructing a load current feedforward transfer function relation of a load current feedforward transfer unit;
Load current feedforward transfer function The method comprises the following steps: /(I)；
R f is parasitic resistance on inductance, L f filter inductance, k Pi is inverter current inner loop proportional control coefficient, s=σ+jω is complex parameter variable, called complex frequency;
By satisfying the load current feedforward transfer function relation of the load current feedforward transfer unit, the equivalent output impedance of the inverter is 0, and the harmonic wave of the input voltage of the inverter is reduced.
7. The topological structure of the inverter comprises the inverter, wherein the input end of the inverter is connected with a direct current unit, the output end of the inverter is connected with a nonlinear load through a filter, and a load current feedforward transmission unit is arranged between the filter and the nonlinear load; the device is characterized by comprising the following modules:
and a model building module: constructing a mathematical model of the inverter by converting the kirchhoff voltage and current equation into a complex frequency domain form through coordinate transformation and Laplace transformation;
The relation processing module: constructing a relation of inverter output voltage, input voltage reference and output current:
Wherein G(s) represents the transfer function of the output voltage with respect to the voltage control outer loop reference voltage:
z o(s) represents the transfer function of the output voltage versus the output current, i.e. the inverter equivalent output impedance:
；
A condition constraint module: setting the equivalent output impedance of the inverter to 0, and constructing a load current feedforward transfer function relation of a load current feedforward transfer unit;
Load current feedforward transfer function The method comprises the following steps: /(I)；
R f is parasitic resistance on inductance, L f filter inductance, k Pi is inverter current inner loop proportional control coefficient, s=σ+jω is complex parameter variable, called complex frequency;
And a comparison module: the load current feedforward transfer function relation of the load current feedforward transfer unit is satisfied.
8. The topological structure of the inverter comprises the inverter, wherein the input end of the inverter is connected with a direct current unit, the output end of the inverter is connected with a nonlinear load through a filter, and a load current feedforward transmission unit is arranged between the filter and the nonlinear load; the device is characterized by comprising the following modules:
Model building unit: constructing a mathematical model of the inverter by converting the kirchhoff voltage and current equation into a complex frequency domain form through coordinate transformation and Laplace transformation;
relationship processing unit: constructing a relation of inverter output voltage, input voltage reference and output current:
Wherein G(s) represents the transfer function of the output voltage with respect to the voltage control outer loop reference voltage:
z o(s) represents the transfer function of the output voltage versus the output current, i.e. the inverter equivalent output impedance:
；
condition constraint unit: setting the equivalent output impedance of the inverter to 0, and constructing a load current feedforward transfer function relation of a load current feedforward transfer unit;
Load current feedforward transfer function The method comprises the following steps: /(I)；
R f is parasitic resistance on inductance, L f filter inductance, k Pi is inverter current inner loop proportional control coefficient, s=σ+jω is complex parameter variable, called complex frequency;
comparison unit: the load current feedforward transfer function relation of the load current feedforward transfer unit is satisfied.
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