CN108539790A - A kind of grid-connected photovoltaic inverter electric current Optimal Control System and method - Google Patents
A kind of grid-connected photovoltaic inverter electric current Optimal Control System and method Download PDFInfo
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- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention discloses a kind of grid-connected photovoltaic inverter electric current Optimal Control System and methods, including：Data sampling module, signal converter, weighted average current controller, cross coupling compensation controller, track with zero error device and PWM generator；The output end of data sampling module is connect with signal converter, and the output end of the signal converter is separately connected weighted average current controller and cross coupling compensation controller；The output of the weighted average current controller and cross coupling compensation controller is separately connected adder, and output end, track with zero error device and the PWM generator of the adder are sequentially connected.Compared to traditional monocycle control system, the present invention devises the dead beat current control system fed back with feedforward compensation, can not only eliminate the static error of the introducing of weighted current Controlling model so that output current control is more accurate, faster, control effect is more preferable for tracking velocity simultaneously.
Description
Technical field
The invention belongs to parallel network power generation field more particularly to a kind of grid-connected photovoltaic inverter electric current Optimal Control Systems
And method.
Background technology
Photovoltaic solar grid-connected system core component is the gird-connected inverter of electronic power switch device composition, to disappear
Except the flood tide harmonic wave that switching device is brought, the LCL filter containing larger capacity high-frequency absorption capacitance can be all configured in inverter.
Although the introducing of capacitance reduces voltage output ripple so that the output of inverter becomes more smooth, but has also been introduced
Control problem enhances the resonance of LCL filter especially when grid-connected, and reduces current follow-up control precision, generates
Static tracking error can make inverter out of control when serious, generating system off-grid failure.
Invention content
The present invention is to solve the above-mentioned problems, it is proposed that a kind of grid-connected photovoltaic inverter electric current Optimal Control System and side
Method establishes control system closed loop model, and by increasing the input quantity of control system, more systems are introduced from the angle of control
Feedback information, and analytical derivation calculating is carried out to feedback information, resonance point when system closed-loop control is theoretically eliminated, together
When, voltage feedforward control link is introduced, current control is optimized and gives, eliminates system control static error so that inverter
Control is more accurate, resonance when solving the problems, such as grid-connected inverters and static error.
To achieve the above object, the present invention uses following technical proposals, including：
The invention discloses a kind of grid-connected photovoltaic inverter electric current Optimal Control System, photovoltaic combining inverter passes through LCL
Filter accesses in micro-capacitance sensor；Including：Data sampling module, signal converter, weighted average current controller, cross-couplings are mended
Repay controller, track with zero error device and PWM generator；
The data sampling module acquires the input and output electric current of LCL filter shunt capacitance both sides and grid-connected inverse respectively
Become the voltage at device access power grid point；
The output end of the data sampling module is connect with signal converter, and the output end of the signal converter connects respectively
Connect weighted average current controller and cross coupling compensation controller；The weighted average current controller and cross coupling compensation
The output of controller is separately connected adder, and output end, track with zero error device and the PWM generator of the adder connect successively
It connects.
Further, collected system analog quantity information is converted to digital information by the sampling module, passes through letter
After number converter is coordinately transformed, it is respectively fed to carry out coupling in weighted average current controller and cross coupling compensation controller
It is total to calculate, obtain control reference voltage level；The control reference voltage level is sent into track with zero error device, is calculated final
Control given value；By PWM generator, the drive signal of IGBT in control photovoltaic combining inverter is generated, is realized grid-connected
The LCL resonance of inverter inhibits and the tracking of floating.
Further, the signal converter realizes abc- α β coordinate transforms.
Further, the input and output both sides of LCL filter shunt capacitance are connected to current sensor and side before bypass respectively
Current sensor behind road.
Further, the PCC points that LCL filter is connect with power grid install voltage sensor.
The invention discloses a kind of grid-connected photovoltaic inverter electric current optimal control methods, include the following steps：
The input and output electric current of acquisition LCL filter shunt capacitance both sides and gird-connected inverter access at power grid point respectively
Voltage；And collected analog information amount is converted into digital quantity；
It is coordinately transformed, digital information obtained above is converted into the variable under α β coordinate systems；
Average computation is weighted to the current data under α β coordinate systems by weighted average current controller, is fed back
Yield value；
Static output error compensation value is calculated by cross coupling compensation controller；
Signal discrete will be controlled by track with zero error device, obtains output voltage control given value；
By output voltage control given value by PWM generator, the driving of IGBT in control photovoltaic combining inverter is generated
Signal realizes that the LCL resonance of photovoltaic combining inverter inhibits the tracking with floating.
Further, the Controlling model of weighted average current controller is defeated with the electric current under α β coordinate systems, voltage quantities
Enter parameter, with Static output error compensation value target in order to control.
Further, Static output error compensation value is calculated by cross coupling compensation controller, specially：Static output
Error compensation value is equal to the product of weighting coefficient and the difference of the current variable under α β coordinate systems.
Further, the Controlling model of the track with zero error device is：
Two of LCL filter are added in voltage of the output voltage control given value equal to common point PCC and signal period
The sum of voltage between inductance.
Further, the current control of the track with zero error device is inputted according to given value of current value, feedback oscillator value and mistake
Poor compensation value calculation obtains.
Advantageous effect of the present invention：
(1) in the system of parallel network power generation or micro-capacitance sensor, the photovoltaic DC-to-AC converter control system of more parallel runnings
Exponent number of uniting is high, difficult design, and design it is improper is easy to happen parallel resonance, the operation of less serious case's off-grid is heavy then inverter is caused to burn
It ruins.The weighted current Controlling model based on Virtual Filters is used in the photovoltaic inverter control system design of the present invention, is made
LCL filter exponent number reduces, and can theoretically eliminate the resonance problems of the grid-connected parallel running of inverter.
(2) compared to traditional monocycle control system, the present invention devises the dead beat electric current fed back with feedforward compensation
Control system can not only eliminate the static error of the introducing of weighted current Controlling model so that output current control is more smart
Really, at the same tracking velocity faster, control effect is more preferable.
Description of the drawings
Fig. 1 is grid-connected photovoltaic inverter electric current Optimal Control System structural schematic diagram of the present invention；
Fig. 2 is cross coupling compensation controller model schematic diagram of the present invention；
Wherein, 1, photovoltaic combining inverter, 2, LCL filter, 3, micro-capacitance sensor, 4, current sensor before bypass, 5, bypass
Current sensor afterwards, 6, PCC point voltage sensors, 7, shunt capacitance, 8, sampling module, 9, signal converter, 10, weighted average
Current controller, 11, cross coupling compensation controller, 12, track with zero error device, 13, PWM generator.
Specific implementation mode：
The invention will be further described below in conjunction with the accompanying drawings.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific implementation mode, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or combination thereof.
As background technology is introduced, in the micro-capacitance sensor 3 of photovoltaic grid-connected inversion power generation, there are a large amount of light used in parallel
Lie prostrate inverter.As the key equipment of transformation of electrical energy, control stability and precision have the safety and steady operation of micro-capacitance sensor 3
Vital effect.Due to the HF switch action for the electronic power switch equipment that core component uses, a large amount of electricity is generated
Emboss wave, it is necessary to be absorbed to high frequency ripple using shunt capacitance 7.But the increase of control system exponent number is also resulted in, to control
Device design proposes challenge.There are resonance points, control to be not allowed to easy to produce resonance for the structure of LCL simultaneously, causes invertor operation
Off-grid accident or overload burning occur for unstability.In order to solve technical problem as above, present applicant proposes a kind of grid-connected photovoltaics
The electric current Optimal Control System and method of inverter.7 liang of 2 shunt capacitance of LCL filter is acquired by sampling with high precision mould module
The input and output electric current namely gird-connected inverter of side send out electric current and the residual current after capacitive bypass, control system it is another
One input quantity is the voltage namely PCC point voltages at gird-connected inverter access power grid point.It uses track with zero error device 12, leads to
Introducing voltage feedforward control is crossed, weighted balance current diffusion limited model is improved, eliminates system closed-loop control static error, is improved
The response speed of system, can be while realizing the quick tracking of instruction current, LCL when inhibition gird-connected inverter parallel connection
The resonance of filter 2.
A kind of grid-connected photovoltaic inverter electric current Optimal Control System, as shown in Figure 1, including：Sampling module 8, signal transformation
Device 9, weighted average current controller 10, cross coupling compensation controller 11, track with zero error device 12 and PWM generator 13.
Photovoltaic combining inverter 1 is accessed by LCL filter 2 in micro-capacitance sensor 3, the input and output both sides point of shunt capacitance 7
Current sensor 5 after not being connected to the preceding current sensor 4 of bypass and bypassing.The outlet of LCL filter 2 is connect with power grid in PCC points,
PCC points voltage sensor 6 is housed herein.
Wherein：Sampling module 8 current sensor 5 and PCC point voltages by current sensor 4 before above-mentioned bypass and after bypassing
The 6 collected system analog quantity information of institute of sensor is converted to digital information, by signal converter 9, is sent into weighted average
Coupling calculating is carried out in current controller 10 and cross coupling compensation controller 11, by proportional gain K, obtains control with reference to electricity
After pressure value, it is sent into track with zero error device 12, final control given value is calculated, by PWM generator 13, generates control light
The drive signal of IGBT in gird-connected inverter 1 is lied prostrate, realizes that the LCL resonance of photovoltaic combining inverter 1 inhibits the tracking with floating.
The control method of grid-connected photovoltaic inverter electric current Optimal Control System of the present invention is as follows：
The input and output electric current of 2 shunt capacitance of acquisition LCL filter, 7 both sides and gird-connected inverter access power grid point respectively
The voltage at place；And collected analog information amount is converted into digital quantity；
It is coordinately transformed, digital information obtained above is converted into the variable under α β coordinate systems；
Average computation is weighted to the current data under α β coordinate systems by weighted average current controller 10, is obtained anti-
Feedforward gain value；
Static output error compensation value is calculated by cross coupling compensation controller 11；
Signal discrete will be controlled by track with zero error device 12, obtains output voltage control given value；
By output voltage control given value by PWM generator 13, the drive of IGBT in control photovoltaic combining inverter 1 is generated
Dynamic signal realizes that the LCL resonance of photovoltaic combining inverter 1 inhibits the tracking with floating.
Gird-connected inverter control system 9 can acquire photovoltaic combining inverter 1 by before LCL filter 2 by sampling module 8
The information of voltage I of three-phase current and PCC points afterwards1、I2、VPCC, after abc- α β transformation and signal condition, obtain α β coordinate systems
Lower variable I1,αβ、I2,αβ、VPCC,αβ。
By weighted average controller to I1,αβ、I2,αβIt is weighted average computation, is obtained：
I12,αβ=δ I1,αβ+(1-δ)·I1,αβ
The relevant value of inductance parameters of wherein weighting coefficient δ and LCL filter 2：
With I12,αβ(k) it is the control targe of system, is had according to system control model：
Wherein, GI12-Vout(s) it is feedback oscillator value, L1、L2The respectively inductance value of LCL filter 2, VPCC,αβIt is sat for α β
Common point voltage quantities under mark system, Vout,αβFor output voltage variable.
From the above equation, we can see that the third-order model of script LCL filter 2 simplifies the Virtual Filters model for single order, from control
Theoretical angle is made, weighted average controller can realize the fast of 1 electric current of photovoltaic combining inverter by increasing feedback oscillator value
Speed tracking, while also eliminating the resonance problems of third-order model.
From control accuracy, weighted average controller will introduce Static output error：
I12,αβ-I2,αβ=[δ I1,αβ+(1-δ)·I2,αβ]-I2,αβ=δ (I1,αβ-I2,αβ)
In order to compensate for this static error, cross coupling compensation controller 11 is increased in system, model is shown in Fig. 2,
Ignore inductance L2Upper very small current loss, the by-pass current by 2 capacitance of LCL filter are：
Icap,αβ=(I1,αβ-I2,αβ)=sCf·VC,αβ≈sCf·VPCC,αβ
Therefore, it is necessary to the electric currents of compensation to be calculated by cross coupling compensation controller 11：
Icomp,αβ=δ (I1,αβ-I2,αβ)=δ sCf·VPCC, α β≈jδωfCf·VPCC,αβ
Wherein, δ is weighting coefficient, I1,αβ、I2,αβCurrent variable respectively under α β coordinate systems, VPCC,αβFor under α β coordinate systems
Voltage quantities, CfFor filter capacitor, ωfFor filter resonance angular frequency.
The track with zero error device 12 of present system design, has ignored controller and sample delay, will control signal discrete
Change, current control input is that given value, the value of feedback of weighted average controller calculating and cross coupling compensation controller 11 are counted
The sum of offset three of calculation：
Iref_WAC,αβ(k)=Iref,αβ(k)+Icomp,αβ(k)-I12,αβ(k)；
Its controller model is：
Wherein,For output voltage control given value；Iref_WAC,αβ(k) it is that current control inputs；L1、L2Respectively
The inductance value of LCL filter 2, VPCC_ave,αβ(k) it is voltage, the T of common point (PCC)sPeriod in order to control.
Output voltage control given valueBy PWM generator 13, control photovoltaic combining inverter 1 exports, and realizes
The control purpose of system, that is, eliminate system closed-loop control static error, improve the response speed of system, is instructed realizing
While the quick tracking of electric current, inhibit the resonance of the LCL filter 2 when gird-connected inverter parallel connection.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (10)
1. a kind of grid-connected photovoltaic inverter electric current Optimal Control System, photovoltaic combining inverter access micro- electricity by LCL filter
In net；It is characterised in that it includes：Data sampling module, signal converter, weighted average current controller, cross coupling compensation
Controller, track with zero error device and PWM generator；
The data sampling module acquires the input and output electric current and gird-connected inverter of LCL filter shunt capacitance both sides respectively
Access the voltage at power grid point；
The output end of the data sampling module is connect with signal converter, and the output end of the signal converter, which is separately connected, to be added
Weight average current controller and cross coupling compensation controller；The weighted average current controller and cross coupling compensation control
The output of device is separately connected adder, and output end, track with zero error device and the PWM generator of the adder are sequentially connected.
2. a kind of grid-connected photovoltaic inverter electric current Optimal Control System as described in claim 1, which is characterized in that the sampling
Collected system analog quantity information is converted to digital information by module, after being coordinately transformed by signal converter, point
Coupling calculating Song Ru not be carried out in weighted average current controller and cross coupling compensation controller, obtain control reference voltage
Value；The control reference voltage level is sent into track with zero error device, final control given value is calculated；Occurred by PWM
Device generates the drive signal of IGBT in control photovoltaic combining inverter, realizes the inhibition of LCL resonance and the nothing of photovoltaic combining inverter
The tracking of static difference.
3. a kind of grid-connected photovoltaic inverter electric current Optimal Control System as described in claim 1, which is characterized in that the signal
Converter realizes abc- α β coordinate transforms.
4. a kind of grid-connected photovoltaic inverter electric current Optimal Control System as described in claim 1, which is characterized in that LCL is filtered
The input and output both sides of device shunt capacitance are connected to current sensor and current sensor after bypass before bypass respectively.
5. a kind of grid-connected photovoltaic inverter electric current Optimal Control System as described in claim 1, which is characterized in that LCL is filtered
The PCC points that device is connect with power grid install voltage sensor.
6. a kind of grid-connected photovoltaic inverter electric current optimal control method, which is characterized in that include the following steps：
The input and output electric current of acquisition LCL filter shunt capacitance both sides and gird-connected inverter access the electricity at power grid point respectively
Pressure；And collected analog information amount is converted into digital quantity；
It is coordinately transformed, digital information obtained above is converted into the variable under α β coordinate systems；
Average computation is weighted to the current data under α β coordinate systems by weighted average current controller, obtains feedback oscillator
Value；
Static output error compensation value is calculated by cross coupling compensation controller；
Signal discrete will be controlled by track with zero error device, obtains output voltage control given value；
By output voltage control given value by PWM generator, the drive signal of IGBT in control photovoltaic combining inverter is generated,
Realize that the LCL resonance of photovoltaic combining inverter inhibits the tracking with floating.
7. a kind of grid-connected photovoltaic inverter electric current optimal control method as claimed in claim 6, which is characterized in that weighted average
The Controlling model of current controller using under α β coordinate systems electric current, voltage quantities as input parameter, with Static output error compensation
It is worth target in order to control.
8. a kind of grid-connected photovoltaic inverter electric current optimal control method as claimed in claim 6, which is characterized in that pass through intersection
Compensating for coupling controller calculates Static output error compensation value, specially：Static output error compensation value is equal to weighting coefficient and α
The product of the difference of current variable under β coordinate systems.
9. a kind of grid-connected photovoltaic inverter electric current optimal control method as claimed in claim 6, which is characterized in that the indifference
Clap controller Controlling model be：
Two inductance of LCL filter are added in voltage of the output voltage control given value equal to common point PCC and signal period
Between the sum of voltage.
10. a kind of grid-connected photovoltaic inverter electric current optimal control method as claimed in claim 6, which is characterized in that the nothing
The current control input of beat control device is calculated according to given value of current value, feedback oscillator value and error compensation value.
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Application publication date: 20180914 |