CN108306332A - A kind of LCL type grid-connected inverting system and curren tracing control method - Google Patents
A kind of LCL type grid-connected inverting system and curren tracing control method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- 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
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Abstract
The invention discloses a kind of LCL type parallel network reverse device and curren tracing control methods, the device includes inverter, LCL type filter, voltage collector, current collector, capacitance voltage controller, the first inductive current controller, the second inductive current controller, first voltage coordinate converter, second voltage coordinate converter and electric current coordinate converter, and the first inductive current controller is according to the LCL type gird-connected inverter and three-phase voltage of net side, LCL type gird-connected inverter and the electric current of net side and the current instruction value output capacitance voltage instruction value of the second inductance；Capacitance voltage controller determines the current instruction value of the first inductance according to the current instruction value of the three-phase voltage of capacitance and the second inductance in capacitance voltage command value, LCL filter；First inductive current controller determines the modulation voltage command value of inverter according to the three-phase voltage of capacitance and the three-phase current of inverter inverter side in the current instruction value of the first inductance, LCL filter, realizes current follow-up control.
Description
Technical field
The present invention relates to gird-connected inverter technical fields, and in particular to a kind of LCL type grid-connected inverting system and current tracking
Control method.
Background technology
As photovoltaic, wind energy distributed new energy permeability are continuously improved, gird-connected inverter is distributed new hair
Electric equipment connects the necessary interface equipment of AC distribution net, and gird-connected inverter brings the stability and power quality of power distribution network and asks
Topic.It usually requires to seal in filter in order to improve the quality of grid-connected current, between inverter and power distribution network, frequently with single inductance L
Filter and LCL filter.Compared to L filters, LCL filter can effectively inhibit switching frequency harmonic wave, improve grid-connected electricity
The advantages that current mass, reduction hardware cost.But since LCL filter is there are intrinsic resonant frequency, it is easy to cause parallel network reverse
Device generates resonance, influences current quality, possibly even gird-connected inverter is caused to be not normally functioning when serious, it is therefore desirable to is right
LCL filter carries out damping design to inhibit resonance.
Currently, there are two main classes for the resonance damping control method of realization gird-connected inverter LCL filter, it is passive to damp and have
Source damping method.Passive damping method increases the damping of filter to inhibit resonance, the party by capacitive branch series connection low resistance
Method is simple, will not increase the control complexity of system, but can increase the power attenuation of system in capacitive branch series resistance, drop
The system effectiveness of low gird-connected inverter, in addition, the method for passive damping is likely to decrease the low-frequency gain and high frequency of LCL filter
The inhibition of harmonic wave.In order to avoid the ill effect that passive damping tape comes, active damping control technology may be used, by suitable
When control algolithm, introduce automatic virtual blocks, the frequency characteristic of LCL filter is had modified from control loop, is reached and passive resistance
The similar damping of Buddhist nun's method, it is however generally that, active damping method can be divided into two classes again：First, based on state variable feedback
Active damping method；Second is that the active damping method based on trapper.Although current active damping control method can be preferable
Inhibit resonant frequency point, but there is also some disadvantages, as control parameter setting is complicated, it is poor to systematic parameter perturbation rejection ability,
The problems such as steady operation bandwidth is low.
Invention content
In view of the foregoing drawbacks, the purpose of the present invention is to provide a kind of LCL type parallel network reverse device and current follow-up controls
Method, it is intended to solve the technical problem of controller design complexity in existing LCL type parallel network reverse device.
As an aspect of of the present present invention, the present invention provides a kind of LCL type parallel network reverse device, including：
Three-phase inverter, the LCL type filter being connect with the output end of three-phase inverter and the same three-phase inverter of output end
Control terminal connection controller, wherein controller includes：
Voltage collector, capacitance in the three-phase voltage and LCL filter for acquiring LCL type gird-connected inverter and net side
Three-phase voltage；
Current collector, the three-phase current and LCL type gird-connected inverter for acquiring three-phase inverter inverter side and net side
Electric current；
Second inductive current controller, first input end are connected with the second output terminal of voltage collector, and second is defeated
The second output terminal for entering end with current collector connects, and third input terminal receives the current instruction value of the second inductance, is used for root
According to the LCL type gird-connected inverter and three-phase voltage of net side, LCL type gird-connected inverter and the electric current of net side and the electric current of the second inductance
The voltage instruction value of command value output capacitance；
Capacitance voltage controller, first input end are connected with the first output end of voltage collector, the second input terminal
Output end with the second inductive current controller connects, and third input terminal receives the current instruction value of the second inductance, is used for root
The first electricity is determined according to the three-phase voltage of capacitance in the voltage instruction value of capacitance, LCL filter and the current instruction value of the second inductance
The current instruction value of sense；
First inductive current controller, first input end are connected with the first output end of voltage collector, and second is defeated
The first output end for entering end with current collector connects, and third input terminal is connected with the output end of capacitance voltage controller, is used
According to the three-phase voltage of capacitance in the current instruction value of the first inductance, LCL filter and the three-phase current of inverter inverter side
Determine the modulation voltage command value of inverter；
The modulation voltage command value of inverter generates trigger pulse control switching tube after PWM modulation and cut-offs, and realizes LCL
The instruction current of type inverter tracks.
Preferably, which further includes：
First voltage coordinate converter is set there are three output end, and input terminal is connected with the output end of voltage collector,
Its first output end is connected with the input terminal of capacitance voltage controller, second output terminal with the first inductive current controller the
One input terminal connects, and third output end is connected with the first input end of the second inductive current controller, is used for LCL filter
The three-phase voltage of middle capacitance from abc three-phase static coordinate systems be converted to dq coordinate systems and by the first output end and second output terminal it is defeated
Go out, at the same by the three-phase voltage of LCL type gird-connected inverter and net side from abc three-phase static coordinate systems be converted to dq coordinate systems and by
Third output end exports；
Electric current coordinate converter is set there are two output end, and input terminal is connected with the output end of current collector, the
One output end is connected with the second input terminal of the first inductive current controller, and second output terminal is the same as the second inductive current controller
The second input terminal connection, for the three-phase current of inverter inverter side to be converted to dq coordinates from abc three-phase static coordinate systems
It is simultaneously to be exported by the first output end, while the electric current of LCL type gird-connected inverter and net side being converted from abc three-phase static coordinate systems
It is exported at dq coordinate systems and by second output terminal；
Second voltage coordinate converter, input terminal are connected with the output end of the first inductive current controller, and being used for will be inverse
The voltage instruction for becoming device is converted to abc three-phase static coordinate systems from dq coordinate systems；And
PWM modulator, input terminal are connected with the output end of second voltage changes in coordinates device, are used for abc three phase statics
Coordinate system modulated voltage instruction value is converted to pwm signal, and pwm signal realizes LCL type parallel network reverse dress for controlling inverter
The instruction current tracking set.
As another aspect of the present invention, a kind of LCL type gird-connected inverter curren tracing control method provided by the invention,
Including following detailed processes：
Step 1：LCL type gird-connected inverter and net side three-phase voltage and LCL filter capacitance are acquired by voltage sensor
Voltage acquires LCL type gird-connected inverter and net side three-phase current and three-phase inverter three-phase output current by current sensor；
Step 2：According to the LCL type gird-connected inverter and three-phase voltage of net side, the electric current of LCL type gird-connected inverter and net side
And second inductance current instruction value output capacitance voltage instruction value；
Step 3：Referred to according to the electric current of the three-phase voltage of capacitance and the second inductance in capacitance voltage command value, LCL filter
Value is enabled to determine the current instruction value of the first inductance；
Step 4：According to the three-phase voltage and three-phase inverter of capacitance in the current instruction value of the first inductance, LCL filter
The three-phase current of inverter side determines the modulation voltage command value of inverter；
Step 5：The modulation voltage command value of inverter is coordinately transformed and modulation treatment output pwm signal, PWM letters
Number for controlling inverter, the instruction current tracking of LCL type parallel network reverse device is realized.
Preferably, according to formula in step 2Obtain capacitance voltage
Command value；
Wherein, vSd、vSqThe respectively d axis components and q axis components of LCL type gird-connected inverter and the three-phase voltage of net side,
iL2d、iL2qThe respectively d axis components and q axis components of LCL type gird-connected inverter and the electric current of net side,Respectively second
The d axis components and q axis components of the current instruction value of inductance,The respectively d axis components and q axis of capacitance voltage command value
Component；L2For the inductance value of the second inductance in LCL filter, R2For the equivalent resistance of the second inductance, rd2For the second virtual resistance
Resistance value, ω be power frequency angular frequency.
Preferably, according to formula in step 3Obtain the first inductive current
Command value；
Wherein, vCd、vCqThe three-phase voltage d axis components and q axis components of capacitance respectively in LCL filter,Point
Not Wei the first inductance current instruction value d axis components and q axis components, C be LCL filter in capacitance capacitance, rd3It is
The resistance value of three virtual resistances.
Preferably, according to formula in step 4Obtain inverter
Modulation voltage command value
Wherein, vd、vqThe respectively modulation voltage command value d axis components and q axis components of inverter, L1For in LCL filter
The inductance value of first inductance, R1For the equivalent resistance of the first inductance, iL1d、iL1qThe respectively electric current of three-phase inverter inverter side
D axis components and q axis components, rd1For the resistance value of the first virtual resistance.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect：
1, the present invention proposes the curren tracing control method of LCL type parallel network reverse device, grid-connected inverse by establishing LCL type
The Euler-Lagrange equation for becoming device configures the energy and injection automatic virtual blocks of system so that the tracking of system gross energy is desired
Energy function, and make the state variable asymptotic convergence of system to desired value, propose the second inductive current control rate, capacitance voltage control
Rate processed and the first inductive current control rate realize the tracking of LCL type gird-connected inverter instruction current.
2, the control law of control method explicit physical meaning of the invention, design is Existence of Global Stable, controller design letter
Single, dynamic response is fast, strong robustness, and controller injects automatic virtual blocks when exporting dq axis command voltages, realizes LCL resonant frequencies
Inhibition, improve the quality of inverter output current waveform.
Description of the drawings
Fig. 1 is the structural schematic diagram of LCL type inverter provided by the invention；
Fig. 2 is the structural schematic diagram of controller in LCL type inverter provided by the invention；
Fig. 3 is the simulation waveform of the current on line side and inverter side electric current of LCL filter under stable situation；
Fig. 4 is LCL type gird-connected inverter desired output current amplitude IL2d-ref=20A, IL2q-refA phases when=0A are mutually electric
Pressure, phase current waveform figure；
Fig. 5 is LCL type gird-connected inverter desired output current amplitude IL2d-ref=0A, IL2q-refA phases when=20A are mutually electric
Pressure, phase current waveform figure；
Fig. 6 is LCL type gird-connected inverter desired output current amplitude IL2d-ref=20A, IL2q-refA phases when=20A are mutually electric
Pressure, phase current waveform figure；
Fig. 7 is that LCL type gird-connected inverter instruction current is mutated A phases phase voltage, phase current waveform figure.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below by by embodiment more
Explain the present invention in detail, it should be understood that but following embodiment is merely illustrative, and protection scope of the present invention is not by these
The limitation of embodiment.
As shown in Figure 1, LCL type parallel network reverse device provided by the present invention includes LCL type gird-connected inverter, voltage acquisition
Device, current collector and controller composition.Wherein, LCL type gird-connected inverter includes three-phase inverter and LCL filter, LCL filters
Wave device is made of the identical A phases filter circuit of structure, B phases filter circuit and C phase filter circuits, and A phase filter circuits include two
Inductance L1 and L2, one end of inductance L1 are connected with one end of another inductance L2, and the other end of inductance L1 is as A phase filter circuits
First inductance end, the second inductance end of the other end of another inductance L2 as A phase filter circuits；One end of capacitance C is connected to two
A inductance connection end, the other end of capacitance C are connected to common end.First inductance end of A phases, B phases and C phase three-phase filter circuits is total
With the first inductance end for constituting LCL filter, the second inductance end of A phases, B phases and C phase three-phase filter circuits collectively forms LCL filters
Second inductance end of wave device.First inductance side of the inverter side of three-phase inverter and LCL filter connects, and the of LCL filter
Two inductance sides as LCL type gird-connected inverter and net side, the DC side of three-phase inverter is as the straight of LCL type gird-connected inverter
Flow side.
Controller includes voltage collector, current collector, first voltage coordinate converter, electric current coordinate converter,
One inductive current controller, the second inductive current controller, capacitance voltage controller, second voltage coordinate converter and PWM tune
Device processed.
The DC side of LCL type gird-connected inverter is connected by DC capacitor with new energy equipment, LCL type parallel network reverse
Device and net side connect AC system, voltage collector is used to acquire the three-phase voltage and LCL of LCL type gird-connected inverter and net side
The three-phase voltage of capacitance in filter is exported the three-phase voltage of capacitance in LCL filter by the first output end of voltage collector,
By the second output terminal output LCL type gird-connected inverter of voltage collector and the three-phase voltage of net side.Current collector is for adopting
The electric current for collecting the three-phase current and LCL type gird-connected inverter and net side of three-phase inverter inverter side, by the first of current collector
Output end exports the three-phase current of three-phase inverter inverter side, grid-connected inverse by the second output terminal output LCL type of current collector
Become device and the electric current of net side.
First voltage coordinate converter is set there are three output end, the same voltage collector of first voltage coordinate converter input terminal
Output end connection, the first output end of first voltage coordinate converter with capacitance voltage controller input terminal connect, first electricity
Coordinate converter second output terminal is pressed to be connected with the first input end of the first inductive current controller, first voltage coordinate converter
Third output end is connected with the first input end of the second inductive current controller.
Electric current coordinate converter is set there are two output end, output end of the electric current coordinate converter input terminal with current collector
Connection, the first output end of electric current coordinate converter are connected with the second input terminal of the first inductive current controller, and electric current coordinate becomes
Parallel operation second output terminal is connected with the second input terminal of the second inductive current controller.
The third input terminal of second inductive current controller receives the current instruction value of the second inductance, capacitance voltage controller
The second input terminal connected with the output end of the second inductive current controller, the third input terminal of capacitance voltage controller receives the
The third input terminal of the current instruction value of two inductance, the first inductive current controller connects with the output end of capacitance voltage controller
It connects.Second voltage coordinate converter input terminal is connected with the output end of the first inductive current controller.PWM modulator input terminal is same
The output end of second voltage changes in coordinates device connects.
First voltage coordinate converter is used for the three-phase voltage of capacitance in LCL filter from abc three-phase static coordinate systems
It is converted to dq coordinate systems and is exported by the first output end and second output terminal, while by the three of LCL type gird-connected inverter and net side
Phase voltage is converted to dq coordinate systems from abc three-phase static coordinate systems and is exported by third output end.
Electric current coordinate converter is used to convert the three-phase current of three-phase inverter inverter side from abc three-phase static coordinate systems
It is exported at dq coordinate systems and by the first output end, while the electric current of LCL type gird-connected inverter and net side being sat from abc three phase statics
Mark system is converted to dq coordinate systems and is exported by second output terminal.
Second inductive current controller is sat according to LCL type gird-connected inverter under dq coordinate systems and the three-phase voltage of net side, dq
The current instruction value output capacitance voltage of second inductance under the lower LCL type gird-connected inverter of mark system and the electric current and dq coordinate systems of net side
Command value.
Capacitance voltage controller is according to capacitance in LCL filter under capacitance voltage command value, dq coordinate systems under dq coordinate systems
Three-phase voltage and dq coordinate systems under the current instruction value of the second inductance determine the current instruction value of the first inductance.
First inductive current controller is filtered according to LCL under the current instruction value of the first inductance, dq coordinate systems under dq coordinate systems
The three-phase current of three-phase inverter inverter side determines inversion under dq coordinate systems under the three-phase voltage of capacitance and dq coordinate systems in wave device
The modulation voltage command value of device.
Second voltage coordinate converter is used to the modulation voltage command value of inverter being converted to abc three-phases from dq coordinate systems
Rest frame.
PWM modulator is converted to pwm signal with by abc three-phase static coordinate system modulated voltage instruction values, and pwm signal is used
In control inverter so that LCL type inverter exports the current instruction value of the second inductance, that is, keeps LCL type inverter
And current on line side is command value.
The present invention provides a kind of LCL type inverter and net side curren tracing control method, the current follow-up control
Method includes the following steps：
Step 1：LCL type gird-connected inverter and net side three-phase voltage and LCL filter capacitance are acquired by voltage sensor
Voltage acquires gird-connected inverter and net side three-phase current and inverter three-phase output current by current sensor.
Step 2：According to the LCL type gird-connected inverter and three-phase voltage of net side, the electric current of LCL type gird-connected inverter and net side
And second inductance current instruction value output capacitance voltage instruction value.
Wherein, the d axis components v of LCL type gird-connected inverter and the three-phase voltage of net sideSdWith q axis components vSq, LCL type it is grid-connected
The d axis components i of the electric current of grid-connected inverters sideL2dWith q axis components iL2q, the second inductance current instruction value d axis componentsAnd q
Axis componentAnd the d axis components of capacitance voltage command valueWith q axis componentsMeet following formula：
In above formula, L2For the inductance value of the second inductance in LCL filter, R2For the equivalent resistance of the second inductance, ω is power frequency
Angular frequency, rd2For the resistance value of the second virtual resistance, rd2＞ 0.
Step 3：According to the capacitance voltage command value obtained in step 2, in LCL filter capacitance three-phase voltage and second
The current instruction value of inductance determines the current instruction value of the first inductance.
Wherein, the d axis components of capacitance voltage command valueWith q axis componentsThe three-phase voltage d of capacitance in LCL filter
Axis component vCdWith q axis components vCq, the second inductance current instruction value d axis componentsWith q axis componentsAnd first inductance
The d axis components of current instruction valueWith q axis componentsMeet following formula：
In above formula, C is the capacitance of capacitance in LCL filter, rd3For the resistance value of third virtual resistance, rd3＞ 0.
Step 4：According to the three-phase voltage of capacitance in the current instruction value of the first inductance, LCL filter and inverter inversion
The three-phase current of side determines the modulation voltage command value of inverter.
Wherein, the d axis components of the current instruction value of the first inductanceWith q axis componentsThe three of capacitance in LCL filter
The d axis components v of phase voltageCdWith q axis components vCqAnd the three-phase current d axis components i of inverter inverter sideL1dWith q axis components iL1qAnd
The modulation voltage command value d axis components v of inverterdWith q axis components vqMeet following formula：
In above formula, L1For the inductance value of the first inductance in LCL filter, R1For the equivalent resistance of the first inductance, rd1It is
The resistance value of one virtual resistance, rd1＞ 0.
Step 5：The modulation voltage command value of inverter is coordinately transformed and modulation treatment output pwm signal, PWM letters
Number for controlling inverter so that LCL type inverter exports the current instruction value of the second inductance.
The design process of lower surface analysis curren tracing control method provided by the invention：
1st step：Gird-connected inverter is acquired in points of common connection (Point ofCommon by voltage sensor
Coupling, PCC) PCC point three-phase voltages and LCL filter capacitance voltage, pass through current sensor and acquires gird-connected inverter three
Phase grid-connected current and inverter three-phase output current, by the way that PCC point voltage magnitudes and phase is directly calculated；
2nd step：According to Kirchhoff's law, the mathematical model of LCL type gird-connected inverter is established：
Wherein, iL1kFor the exchange side three-phase current of three-phase inverter, iL2kFor LCL type gird-connected inverter and net side three-phase
Electric current, vCkFor LCL filter capacitance voltage, vSkFor LCL type gird-connected inverter PCC point three-phase voltages, vkFor three-phase inverter
Exchange side three-phase voltage, R1For inductance L1Equivalent resistance, R2For inductance L2Equivalent resistance；K=a, b, c, a, b, c indicate A, B, C tri-
Phase.
By abc-dq coordinate transforms, obtain LCL type gird-connected inverter rotates the mathematical model under dq coordinates in two-phase：
Wherein, iL1dAnd iL1qFor inductance L1D axis and q shaft currents, iL2dAnd iL2qFor inductance L2D axis and q shaft currents, vSd
And vSqFor PCC point d axis and q shaft voltage components, vCdAnd vCqFor LCL filter capacitance voltage d axis and q axis components, vdAnd vqIt is three
The d axis and q axis components of the exchange side three-phase voltage of phase inverter, w are power grid fundamental frequency angular frequency；
3rd step：Establish the Euler-Lagrange model of LCL type gird-connected inverter according to Passive Shape Control theory, and by its point
For two subsystems, wherein subsystem 1 tracks for inverter side instruction current, and subsystem 2 is that LCL resonant frequencies inhibit control.
Wherein, F1=[vd-vCd vq-vCq]T,R1=diag [R1
R1], x1=[iL1d iL1q]T。
F2=[- vSd -vSq iL1d iL1q]T,R2=diag [R2 R20 0],x2=[- iL2d -iL2q vCd vCq]T。
The energy stores function of subsystem is
4th step：In order to by inverter asymptotically stability in expectation balance point x1 *And x2 *, construct the dynamic error equation of system：
Wherein,
The error energy storage function of subsystem is
The Euler-Lagrange model that the dynamic error equation of system is substituted into LCL type gird-connected inverter, can obtain
By formula (10) it is found that when the dynamic error of system goes to zero, the quantity of state asymptotically stability of inverter it is expected to put down
Weigh point, and the error energy storage function of subsystem also tends to zero at this time.
5th step：Since LCL type inverter equivalent damping is smaller, system convergence speed is slower, to accelerate the convergence speed of system
Degree, is added automatic virtual blocks in the controller, makes error energy storage function Fast Convergent to zero, injection automatic virtual blocks are chosen for：
Wherein rd1＞ 0, rd2＞ 0, rd3＞ 0.
6th step can obtain dynamic error system equation newly when introducing automatic virtual blocks：
In order to realize d axis and q shaft current decoupling controls, ξ is chosen1=J1x1eAnd ξ2=0, the electric current of LCL type inverter can be obtained
Inner ring control law is
Inverter system parameter substitution formula (13) be can be obtained into specific control law.
7th step：Due to M1And M2For positively definite matrix, therefore the error energy storage function H of subsystem1e(x) and H2e(x) permanent big
In 0, error energy storage function can obtain time-derivative
According to Lyapunov theorems it is found that the control law formula (10) of design is stable and convergent, LCL type inverter can be real
Existing output current tracing control, adjusts R1dAnd R2dH can be achieved1e(x) and H2e(x) zero speed is converged to.
This method is on the basis of the mathematical model of the Euler-Lagrange equation of gird-connected inverter and Strictly passive control, structure
Error energy equation is built, to obtain the passive control law of LCL type gird-connected inverter dq shaft currents decoupling, using damping injection side
Method inhibits LCL resonant frequencies and improves dynamic performance.
It is the correctness and its control effect for illustrating LCL type gird-connected inverter curren tracing control method below, establishes imitative
True mode, model schematic is as shown in Fig. 1, and model basic parameter is described as follows：
System power supply rated voltage line voltage virtual value：Vs=380V；Inverter direct-flow side capacitance：Cdc=5000 μ F,
Voltage instruction value 700V；LCL filter parameter：L1=0.2mH, R1=0.2 Ω, C1=20 μ F, L2=1.0mH, R1=0.1 Ω,
Controller control parameter：rd1=20, rd2=0.5, rd3=0.2.
Fig. 3 is shown under stable situation, the simulation waveform of the current on line side and inverter side electric current of LCL filter, defeated
Go out electric current high-frequency harmonic to be filtered out substantially, filter effect is good, while can effectively inhibit resonance phenomena.
Fig. 4 show LCL type gird-connected inverter desired output current amplitude IL2d-ref=20A, IL2q-refA phases when=0A
Phase voltage, phase current waveform figure.Fig. 5 show LCL type gird-connected inverter desired output current amplitude IL2d-ref=0A, IL2q-ref
A phases phase voltage when=20A, phase current waveform figure, Fig. 6 show LCL type gird-connected inverter desired output current amplitude
IL2d-ref=20A, IL2q-refA phases phase voltage when=20A, phase current waveform figure.
From fig. 4 to fig. 6 it is found that inverter can track d axis and q axis instruction currents well under different operating modes.Thus
As it can be seen that global stability is high, inverter output current harmonic content is small, improves the quality of inverter output current waveform, energy
Enough inhibit LCL resonance.
In addition, the shown LCL type gird-connected inverter instruction currents in 0.2s of Fig. 7 are by IL2d-ref=20A, IL2q-ref=0A is prominent
Change to IL2d-ref=40A, IL2q-ref=0A, inverter have response speed quickly.As it can be seen that a kind of LCL type that the present invention is carried
Gird-connected inverter curren tracing control method has dynamic response fast, strong robustness, and can realize the inhibition of LCL resonant frequencies,
Improve the quality of inverter output current waveform.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all within the spirits and principles of the present invention made by all any modification, equivalent and improvement etc., should all include
Within protection scope of the present invention.
Claims (6)
1. a kind of LCL type parallel network reverse device, which is characterized in that including：Three-phase inverter, the inverter side company with three-phase inverter
The controller that the LCL type filter and output end connect is connected with the control terminal of three-phase inverter, wherein controller includes：
Voltage collector, the three-phase of capacitance in the three-phase voltage and LCL filter for acquiring LCL type gird-connected inverter and net side
Voltage；
Current collector, the electricity of three-phase current and LCL type gird-connected inverter and net side for acquiring three-phase inverter inverter side
Stream；
Second inductive current controller, first input end are connected with the second output terminal of voltage collector, the second input terminal
Second output terminal with current collector connects, and third input terminal receives the current instruction value of the second inductance (L2), is used for root
According to the LCL type gird-connected inverter and three-phase voltage of net side, the electric current of LCL type gird-connected inverter and net side and the second inductance (L2)
The voltage instruction value of current instruction value output capacitance (C)；
Capacitance voltage controller, first input end are connected with the first output end of voltage collector, and the second input terminal is the same as the
The output end of two inductive current controllers connects, and third input terminal receives the current instruction value of the second inductance (L2), is used for root
According to the current instruction value of the three-phase voltage of capacitance (C) and the second inductance (L2) in the voltage instruction value of capacitance (C), LCL filter
Determine the current instruction value of the first inductance (L1)；
First inductive current controller, first input end are connected with the first output end of voltage collector, the second input terminal
The first output end with current collector connects, and third input terminal is connected with the output end of capacitance voltage controller, is used for root
According to the three-phase electricity of the three-phase voltage of capacitance (C) and inverter inverter side in the current instruction value of the first inductance (L1), LCL filter
Stream determines the modulation voltage command value of inverter；
The modulation voltage command value of inverter generates trigger pulse control switching tube after PWM modulation and cut-offs, and realizes that LCL type is inverse
Become the instruction current tracking of device.
2. LCL type parallel network reverse device as described in claim 1, which is characterized in that the LCL type parallel network reverse device also wraps
It includes：
First voltage coordinate converter is set there are three output end, and input terminal is connected with the output end of voltage collector, the
One output end is connected with the input terminal of capacitance voltage controller, and the first of the same first inductive current controller of second output terminal is defeated
Enter end connection, third output end is connected with the first input end of the second inductive current controller, and being used for will be electric in LCL filter
The three-phase voltage of appearance is converted to dq coordinate systems from abc three-phase static coordinate systems and is exported by the first output end and second output terminal,
The three-phase voltage of LCL type gird-connected inverter and net side from abc three-phase static coordinate systems is converted to dq coordinate systems simultaneously and by the
Three output ends export；
Electric current coordinate converter is set there are two output end, and input terminal is connected with the output end of current collector, and first is defeated
Outlet is connected with the second input terminal of the first inductive current controller, second output terminal with the second inductive current controller the
Two input terminals connect, for the three-phase current of inverter inverter side to be converted to dq coordinate systems simultaneously from abc three-phase static coordinate systems
It is exported by the first output end, while the electric current of LCL type gird-connected inverter and net side is converted to dq from abc three-phase static coordinate systems
Coordinate system is simultaneously exported by second output terminal；
Second voltage coordinate converter, input terminal are connected with the output end of the first inductive current controller, are used for inverter
Modulation voltage command value be converted to abc three-phase static coordinate systems from dq coordinate systems；And
PWM modulator, input terminal are connected with the output end of second voltage changes in coordinates device, are used for abc three phase static coordinates
It is that modulated voltage instruction value is converted to pwm signal, pwm signal realizes LCL type parallel network reverse device for controlling inverter
Instruction current tracks.
3. a kind of curren tracing control method based on LCL type parallel network reverse device described in claim 1, which is characterized in that
Include the following steps：
Step 1：LCL type gird-connected inverter and net side three-phase voltage and LCL filter capacitance voltage are acquired by voltage sensor,
LCL type gird-connected inverter and net side three-phase current and three-phase inverter three-phase output current are acquired by current sensor；
Step 2：According to the electric current of the three-phase voltage of LCL type gird-connected inverter and net side, LCL type gird-connected inverter and net side and the
The current instruction value output capacitance voltage instruction value of two inductance；
Step 3：According to the current instruction value of the three-phase voltage of capacitance and the second inductance in capacitance voltage command value, LCL filter
Determine the current instruction value of the first inductance；
Step 4：According to the three-phase voltage of capacitance in the current instruction value of the first inductance, LCL filter and three-phase inverter inversion
The three-phase current of side determines the modulation voltage command value of inverter；
Step 5：The modulation voltage command value of inverter is coordinately transformed and is used with modulation treatment output pwm signal, pwm signal
In control inverter, the instruction current tracking of LCL type parallel network reverse device is realized.
4. curren tracing control method as claimed in claim 3, which is characterized in that according to formula in step 2Obtain capacitance voltage command value；
Wherein, vSd、vSqThe respectively d axis components and q axis components of LCL type gird-connected inverter and the three-phase voltage of net side, iL2d、iL2q
The respectively d axis components and q axis components of LCL type gird-connected inverter and the electric current of net side,The respectively electricity of the second inductance
The d axis components and q axis components of command value are flowed,The respectively d axis components and q axis components of capacitance voltage command value；L2For
The inductance value of second inductance in LCL filter, R2 are the equivalent resistance of the second inductance, rd2For the resistance value of the second virtual resistance, ω
For power frequency angular frequency.
5. curren tracing control method as described in claim 3 or 4, which is characterized in that according to formula in step 3Obtain the command value of the first inductive current；
Wherein, vCd、vCqThe three-phase voltage d axis components and q axis components of capacitance respectively in LCL filter,Respectively
The d axis components and q axis components of the current instruction value of one inductance, C are the capacitance of capacitance in LCL filter, rd3It is virtual for third
The resistance value of resistance.
6. such as claim 3 to 5 any one of them curren tracing control method, which is characterized in that according to formula in step 4Obtain the modulation voltage command value of inverter
Wherein, vd、vqThe respectively modulation voltage command value d axis components and q axis components of inverter, L1It is in LCL filter first
The inductance value of inductance, R1For the equivalent resistance of the first inductance, iL1d、iL1qThe respectively d axis of the electric current of three-phase inverter inverter side
Component and q axis components, rd1For the resistance value of the first virtual resistance.
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