CN105958808A - Control method of photovoltaic grid-connected inverter - Google Patents
Control method of photovoltaic grid-connected inverter Download PDFInfo
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- CN105958808A CN105958808A CN201510947249.8A CN201510947249A CN105958808A CN 105958808 A CN105958808 A CN 105958808A CN 201510947249 A CN201510947249 A CN 201510947249A CN 105958808 A CN105958808 A CN 105958808A
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Classifications
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- H02J3/383—
-
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
-
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The present invention discloses a control method of photovoltaic grid-connected inverter. The method comprises: collecting the power grid three-phase current signal flowing through the inductive reactance; performing add and subtract comparison of the power grid three-phase current signal with the reference current signal, and obtaining an error signal; generating a voltage reference value by using the error signal through a first PI controller, superimposing the output of the voltage reference value to the input end of a PWM controller through a SVM; performing add and subtract comparison of a zero-sequence current with a zero-sequence reference current, and superimposing the obtained result after the add and subtract comparison to the input end of the PWM controller through a second PI controller; regulating the output voltage through the PWM controller; and establishing an inversion control model according to an EL equation model, and controlling the photovoltaic grid connected inverter in the condition of imbalance power grid. The control method of photovoltaic grid-connected inverter is able to improve the system stability and reduce the EMC problems.
Description
Technical field
The present invention relates to power electronic equipment and control technical field, particularly relate to a kind of photovoltaic combining inverter
Control method.
Background technology
Along with improving constantly of the production-scale continuous expansion of the modernization of industry and people's living standard, electric energy supplies
Need contradiction, saves energy to have become as current study hotspot, there is society's meaning of particular importance
Justice and economic implications.Energy crisis, for alleviating energy shortage and environmental crisis, ensures social sustainable development,
Safeguard that national energy security plays an important role.
And electric energy feedback is most efficient method in order to saves energy in recent years.Therefore, people start more
Pay attention to the development of energy feedback system.The power electronics interface carrying out energy conversion generally uses inverter.Inverse
The control performance becoming device directly determines power supply reliability and the robustness of grid-connected system.
Inverter is the transformator of a kind of DC to AC, with the process that converter is a kind of voltage inversion.Conversion
Device is that the alternating voltage of electrical network is changed into stable 12V direct current output, and inverter is that Adapter is defeated
The 12V DC voltage gone out is changed into the High Level AC Voltage of high frequency.Two parts the most all have employed with compare
Many pulsewidth modulation (PWM) technology.Its core is all a PWM integrated manipulator.Adapter uses
Be UC3842, inverter then uses TL5001 chip.The operating voltage range 3.6～40V of TL5001,
Be internally provided with an error amplifier, actuator, agitator, have dead zone function PWM generator,
Low-voltage variation loop and short-circuit protection circuit etc..
The input interface section of inverter has 3 signals, 12V direct current input VIN, work to enable voltage ENB
And Panel current controling signal DIM.VIN is provided by Adapter, and ENB voltage is by the MCU on mainboard
Thering is provided, its value is 0 or 3V, and as ENB=0, inverter does not works, and during ENB=3V, inverter
It is in normal operating conditions；And DIM voltage is provided by mainboard, its excursion, will not between 0～5V
With DIM value feed back to PWM controller feedback end, inverter to load offer electric current also by difference,
DIM value is the least, and the electric current of inverter output is the biggest.
Contravarianter voltage starting-up later time is usually: when ENB is high level, and output high pressure goes to light Panel's
Backlight fluorescent tube.
Inverter PWM controller is made up of following function: internal reference voltage, error amplifier, shake
Swing device and PWM, overvoltage protection, under-voltage protection, short-circuit protection, output transistor.
Inverter DC converting is formed voltage conversion circuit by MOS switch pipe and energy storage inductor, the pulse of input
Amplify rear drive metal-oxide-semiconductor through push-pull amplifier and do switch motion so that DC voltage carries out charge and discharge to inductance
Electricity, the other end of such inductance just can obtain alternating voltage.
Inverter LC vibration and output loop: ensure that fluorescent tube starts the 1600V voltage needed, and open at fluorescent tube
After dynamic, voltage is down to 800V.
Inverter output voltage feeds back: when loaded work piece, feedback sample voltage, plays stable I inverter electricity
The effect of pressure output.
Inverter is classified by control mode, can be divided into the control of voltage source Control of Voltage, voltage source electric current, electric current
Source Control of Voltage and current source current control four kinds of methods.Current source inverter refers in its DC side series connection one
Big inductance, to provide galvanic current stream to input.But, owing to using the system dynamics response of big inductance
Difference, most combining inverter all uses voltage source inverter.
From voltage, electric current control mode for, contravarianter voltage control be equivalent to inverter is equivalent to one
Individual voltage source, controls the phase place of its output voltage, frequency, amplitude reach system requirements.Electric current controls inversion
Device is that inverter is equivalent to a current source, and its electric current exported carries out the control of amplitude, frequency, phase place
System.
At present, voltage control mode is mainly used in the inverter of independent operating, to meet the needs of load end.
Especially a lot of loads have higher requirement to the voltage of superimposed, use electricity the most in this case more
Pressure carries out closed loop control as controlled quentity controlled variable.
And current control mode is mainly used in combining inverter, its output electric current of direct control reaches grid-connected to be wanted
Ask.The combining inverter control mode directly controlling the given electric current of grid-connected current tracking is more widely applied.Its
Control strategy is the most easily designed, if the different controller of conversion, it is possible to carry out grid-connected in different ways
Control.Concrete mode has only to control the output electric current of inverter to follow the tracks of line voltage, concurrently sets output
The size of electric current, i.e. can reach the purpose being incorporated into the power networks.Owing to its control method is relatively easy, effect also than
Preferably, therefore use extensively.
Summary of the invention
The present invention is based on above one or more problem, it is provided that a kind of photovoltaic combining inverter control method,
The stability of system, and the problem that EMC can be cut down can be improved.
Wherein, described inverter employing insulated gate bipolar transistor is as the switching device of main circuit, described
Photovoltaic combining inverter control method includes:
Gather the electrical network three-phase current signal flowing through induction reactance；
With reference current signal, described electrical network three-phase current signal is carried out plus-minus compare, obtain error signal；
Described error signal is generated voltage reference value through a PI controller, by described voltage reference value warp
Cross the output after SVM controller and be superimposed to the input of PWM controller；
With zero sequence reference current, zero-sequence current being carried out plus-minus compare, the result obtained more afterwards by plus-minus is passed through
The input of PWM controller it is superimposed to after 2nd PI controller；
By PWM controller, output voltage is adjusted；
Inversion control model is set up, in the case of unbalanced power supply, to described photovoltaic also according to EL equation model
Net inverter is controlled.
Further, described described electrical network three-phase current signal carried out plus-minus with reference current signal compare,
Obtain error signal to include:
Described electrical network three-phase current signal is carried out clark conversion and obtains the electric current under α β coordinate system and zero sequence
Electric current；
Electric current under described α β coordinate system is carried out park and converts the current signal obtaining under dq coordinate system, will
Current signal under dq coordinate system carries out plus-minus respectively and compares and obtain described mistake with the dq current component of reference current
Difference signal.
Further, described by described error signal through the oneth PI controller generate voltage reference value include:
Described error signal is generated the voltage reference value under dq coordinate system through a described PI controller；
The voltage reference value under α β coordinate system is generated by anti-park conversion.
Further, the dq current component of the current signal under dq coordinate system with reference current is carried out respectively
Plus-minus compares, and obtains described error signal, described error signal output valve after a PI controller by
Gradually it is bordering on the voltage reference value under dq coordinate system.
Further, zero-sequence current is carried out plus-minus with zero sequence reference current and compares, obtain after plus-minus
Result output valve after the 2nd PI controller gradually level off to zero sequence reference current.
Further, the electric current under α β coordinate system carries out park conversion join with to the voltage under dq coordinate system
Examine the anti-park conversion that value carries out the most reverse.
Further, the model of described inversion control model is the mathematical model under three-phase static coordinate system, institute
Stating inversion control model is Passive Shape Control device based on EL equation model.
Further, described basis is set up inversion control model based on EL equation model and is included:
Obtain three-phase line voltage and the three-phase current of inverter ac side；
Obtain inverter direct-flow side maximum power point voltage and maximum power point electric current；
Three-phase line voltage according to described inverter ac side and three-phase current, and described inverter direct-flow side is
High-power point voltage and maximum power point electric current, set up inversion control model based on EL equation model；
The three-phase line voltage that input is described inverter ac side of described inversion control model and three-phase current,
And described inverter direct-flow side maximum power point voltage and maximum power point electric current；Described inverter is output as
Switch function under three-phase static coordinate system.
Further, described basis is set up inversion control model based on EL equation model and is included:
The triple line electric current of described inverter ac side is carried out park conversion, to obtain the friendship under dq coordinate system
Stream side electric current；
Described inverter wiretap function under three-phase static coordinate system is carried out park conversion, it is thus achieved that dq sits
Switch function under mark system；
The three-phase line voltage of described inverter ac side is carried out park conversion, it is thus achieved that the exchange under dq coordinate system
Side voltage；
By the ac-side current under described dq coordinate system, the switch function under dq coordinate system, under dq coordinate system
AC voltage substitute into described inverter mathematical model under three-phase static coordinate system, it is thus achieved that described inversion
Device mathematical model under dq coordinate system；
The inversion control described in the Mathematical Models under dq coordinate system according to EL equation model and described inverter
Simulation.
Further, described inverter is output as:
Wherein, Δ S=Sa+Sb+Sc, Sa、Sb、ScIt is respectively the output of described inversion control model at three-phase
Switch function under rest frame, Sab、Sac、SbcIt is respectively the output of described inversion control model at three-phase
Wiretap function under rest frame.
A kind of photovoltaic combining inverter control method that the present invention provides, remains the modulator approach of SVM, with
Time the opened loop control of zero-sequence current produced by medium-high frequency is introduced closed loop control, the system that effectively improves is altogether
Effect in terms of mode voltage minimizing.Being different from general SPEM modulator approach, the method combines SVM side
While the advantage of method, solve EMC and the problem such as vibration that common mode current causes, can be effectively improved
The closed loop control nargin of system DQ controller, can reduce again the noise that on inductance, oscillating current causes simultaneously and ask
Topic.Additionally, the present invention is by obtaining three-phase line voltage and the three-phase current of inverter ac side, obtain inversion
Device DC side maximum power point voltage and maximum power point electric current, according to the inversion set up based on EL equation model
Controlling model, in the case of unbalanced power supply, is controlled described inverter.Reduce at unbalanced power supply
Time the alternating current harmonic wave that is connected to the grid of photovoltaic combining inverter, and achieve the dynamic decoupling of electric current, improve
The stable state of inverter and dynamic property.
Accompanying drawing explanation
Fig. 1 is the flow chart of a kind of photovoltaic combining inverter control method of the embodiment of the present invention one；
Fig. 2 is the inverter system control block diagram of the embodiment of the present invention two；
Fig. 3 is the connection midpoint NPC topology of the embodiment of the present invention two；
Fig. 4 is that the embodiment of the present invention two connects midpoint NPC topology by resistance；
Fig. 5 is the embodiment of the present invention two zero sequence controller architecture figure.
Detailed description of the invention
The present invention is described in detail with embodiment below in conjunction with the accompanying drawings.If it should be noted that do not rushed
Prominent, each feature in the embodiment of the present invention and embodiment can be combined with each other, all in the protection of the present invention
Within the scope of.
Embodiment one
The embodiment of the present invention one provides a kind of photovoltaic combining inverter control method, and wherein, described inverter is adopted
With insulated gate bipolar transistor as the switching device of main circuit, PWM wave modulation mode is SPWM
Ripple.As it is shown in figure 1, the method includes:
101, the electrical network three-phase current signal of induction reactance is flow through in collection；
102, with reference current signal, described electrical network three-phase current signal is carried out plus-minus to compare, obtain error letter
Number；
Concrete, this step includes:
Described electrical network three-phase current signal is carried out clark conversion and obtains the electric current under α β coordinate system and zero sequence
Electric current；
Electric current under α β coordinate system is carried out park and converts the current signal obtaining under dq coordinate system, by dq
Current signal under coordinate system carries out plus-minus respectively and compares and obtain error signal with the dq current component of reference current.
In this step, the dq current component of the current signal under dq coordinate system with reference current is added and subtracted respectively
Relatively, obtaining error signal, described error signal output valve after a PI controller gradually levels off to
Voltage reference value under dq coordinate system.
103, described error signal is generated voltage reference value through a PI controller, by described Voltage Reference
Value output after SVM controller is superimposed to the input of PWM controller；
Wherein, described by described error signal through the oneth PI controller generate voltage reference value include:
By described error signal voltage reference value under a PI controller generates dq coordinate system；
The voltage reference value under α β coordinate system is generated by anti-park conversion.
Wherein, the electric current under α β coordinate system is carried out park conversion and to the voltage reference value under dq coordinate system
The anti-park conversion carried out is the most reverse.
104, with zero sequence reference current, zero-sequence current is carried out plus-minus to compare, the result obtained more afterwards by plus-minus
The input of PWM controller it is superimposed to after the 2nd PI controller；
Concrete, zero-sequence current is carried out plus-minus with zero sequence reference current and compares, plus-minus is obtained more afterwards
Result output valve after the 2nd PI controller gradually levels off to zero sequence reference current.
105, by PWM controller, output voltage is adjusted；
106, inversion control model is set up according to EL equation model, in the case of unbalanced power supply, to described
Inverter is controlled.
Wherein, the model of described inversion control model is the mathematical model under three-phase static coordinate system, described inverse
Change Controlling model is Passive Shape Control device based on EL equation model.
In this step, described basis sets up inversion control model based on EL equation model specifically can be by not Tongfang
Formula realizes.
Concrete, described basis is set up inversion control model based on EL equation model and be may include that
Obtain three-phase line voltage and the three-phase current of inverter ac side；
Obtain inverter direct-flow side maximum power point voltage and maximum power point electric current；
Three-phase line voltage according to described inverter ac side and three-phase current, and described inverter direct-flow side is
High-power point voltage and maximum power point electric current, set up inversion control model based on EL equation model；
The three-phase line voltage that input is described inverter ac side of described inversion control model and three-phase current,
And described inverter direct-flow side maximum power point voltage and maximum power point electric current；Described inverter is output as
Switch function under three-phase static coordinate system.
Described basis is set up inversion control model based on EL equation model and can also be included:
The triple line electric current of described inverter ac side is carried out park conversion, to obtain the friendship under dq coordinate system
Stream side electric current；
Described inverter wiretap function under three-phase static coordinate system is carried out park conversion, it is thus achieved that dq sits
Switch function under mark system；
The three-phase line voltage of described inverter ac side is carried out park conversion, it is thus achieved that the exchange under dq coordinate system
Side voltage；
By the ac-side current under described dq coordinate system, the switch function under dq coordinate system, under dq coordinate system
AC voltage substitute into described inverter mathematical model under three-phase static coordinate system, it is thus achieved that described inversion
Device mathematical model under dq coordinate system；
The inversion control described in the Mathematical Models under dq coordinate system according to EL equation model and described inverter
Simulation.
Wherein: described inverter is output as:
Wherein, Δ S=Sa+Sb+Sc, Sa、Sb、ScIt is respectively the output of described inversion control model at three-phase
Switch function under rest frame, Sab、Sac、SbcIt is respectively the output of described inversion control model at three-phase
Wiretap function under rest frame..
A kind of photovoltaic combining inverter control method that the present invention provides, remains the modulator approach of SVM, with
Time the opened loop control of zero-sequence current produced by medium-high frequency is introduced closed loop control, the system that effectively improves is altogether
Effect in terms of mode voltage minimizing.Being different from general SPEM modulator approach, the method combines SVM side
While the advantage of method, solve EMC and the problem such as vibration that common mode current causes, can be effectively improved
The closed loop control nargin of system DQ controller, can reduce again the noise that on inductance, oscillating current causes simultaneously and ask
Topic.Additionally, the present invention is by obtaining three-phase line voltage and the three-phase current of inverter ac side, obtain inversion
Device DC side maximum power point voltage and maximum power point electric current, according to the inversion set up based on EL equation model
Controlling model, in the case of unbalanced power supply, is controlled described inverter.Reduce at unbalanced power supply
Time the alternating current harmonic wave that is connected to the grid of photovoltaic combining inverter, and achieve the dynamic decoupling of electric current, improve
The stable state of inverter and dynamic property.
Embodiment two
The embodiment of the present invention one provides a kind of photovoltaic combining inverter control method, and wherein, described inverter is tied
Structure as in figure 2 it is shown, wherein, controls the three-phase line voltage that the input of part is AC, and three-phase current is inverse
Become device DC side peak power voltage UdcmWith maximum power point electric current idcm；It is output as switch function Sa、Sb、
Sc, by switch function Sa、Sb、ScRealize space vector pulse width modulation SVPWM.According to based on EL side
The inversion control model that journey model is set up, in the case of unbalanced power supply, is controlled described inverter.
The present embodiment have employed the topological circuit of Fig. 3 and Fig. 4.Its concrete control method is as shown in Figure 1.
This control method is applied to ia+ib+icIt is not equal to the I introduced described in 0zThe controller of electric current.Due to the I producedz
Electric current cannot be controlled directly to control by DQ axle, it is necessary to IzOne new controller of current design completes to close
Ring controls purpose.
Concrete, the present embodiment provides a kind of photovoltaic combining inverter control method, comprises the following steps:
201, the electrical network three-phase current signal of induction reactance is flow through in collection；
202, current signal is carried out clark conversion and obtains the current signal i under α β coordinate systemα, iβAnd
Zero-sequence current iz；
203, by the current signal i under α β coordinate systemα, iβCarry out park conversion, it is thus achieved that under dq coordinate system
Current signal isq, isd, by isqAnd isdWith the dq current component i controlling the reference current that device providessqref, isdref
Carry out plus-minus respectively to compare, the result that plus-minus obtains more afterwards is generated dq coordinate after a PI controller
Voltage reference value V under XisqrefAnd Vsdref, by isq, isdWith reference current component isqref, isdrefCarry out respectively
Plus-minus compares, and the result after adding and subtracting relatively is added under dq coordinate system by the output valve after PI controller
Voltage reference value VsqrefAnd VsdrefSum also generates voltage reference value under α β coordinate system by anti-park conversion
VsqrefAnd Vsdref, by VsqrefAnd VsdrefF output after SVM controller is superimposed to PWM controller
Input on, concrete, its to the electric current under α β coordinate system is carried out park conversion with to dq coordinate system
Under voltage reference value carry out anti-park conversion the most reverse.
204, by zero-sequence current izWith the zero sequence reference current i be given by control devicezrefCarry out plus-minus to compare,
The result that plus-minus obtains more afterwards is superimposed on the input of PWM controller after the 2nd PI controller；
205, by PWM controller, output voltage is adjusted.
As it is shown in figure 5, the invention reside in 1) obtain zero-sequence current by clark conversion；2) by controlling device
Provide zero sequence reference current；3) zero-sequence current and zero sequence reference current are carried out plus and minus calculation；4) will control
Error input the 2nd PI controller, zero-sequence current is adjusted by the 2nd PI controller by controlling error.Its
In the 2nd PI controller can be the error amplifier of band amplitude limit function；5) output of the 2nd PI controller is straight
Connect the input being added in PWM controller.Controller by the error between zero-sequence current and zero sequence reference current,
By PI controller output regulation PWM, realize the purpose of closed loop regulation zero-sequence current.Through plus-minus ratio
Relatively, the result obtained more afterwards output valve gradually convergence after the 2nd PI controller and zero sequence reference are added and subtracted
Electric current.
The foregoing is only embodiments of the present invention, not thereby limit the scope of the claims of the present invention, every utilization
Equivalent structure or equivalence flow process that description of the invention and accompanying drawing content are made convert, or directly or indirectly use
In the technical field that other are relevant, the most in like manner it is included in the scope of patent protection of the present invention.
Claims (10)
1. a photovoltaic combining inverter control method, it is characterised in that including:
Gather the electrical network three-phase current signal flowing through induction reactance；
With reference current signal, described electrical network three-phase current signal is carried out plus-minus compare, obtain error signal；
Described error signal is generated voltage reference value through a PI controller, by described voltage reference value warp
Cross the output after SVM controller and be superimposed to the input of PWM controller；
With zero sequence reference current, zero-sequence current being carried out plus-minus compare, the result obtained more afterwards by plus-minus is passed through
The input of PWM controller it is superimposed to after 2nd PI controller；
By PWM controller, output voltage is adjusted；
Inversion control model is set up, in the case of unbalanced power supply, to described photovoltaic also according to EL equation model
Net inverter is controlled.
2. photovoltaic combining inverter control method as claimed in claim 1, it is characterised in that described by institute
State electrical network three-phase current signal to carry out plus-minus with reference current signal and compare, obtain error signal and include:
Described electrical network three-phase current signal is carried out clark conversion and obtains the electric current under α β coordinate system and zero sequence
Electric current；
Electric current under described α β coordinate system is carried out park and converts the current signal obtaining under dq coordinate system, will
Current signal under dq coordinate system carries out plus-minus respectively and compares and obtain described mistake with the dq current component of reference current
Difference signal.
3. photovoltaic combining inverter control method as claimed in claim 2, it is characterised in that described by institute
State error signal to include through a PI controller generation voltage reference value:
Described error signal is generated the voltage reference value under dq coordinate system through a described PI controller；
The voltage reference value under α β coordinate system is generated by anti-park conversion.
4. photovoltaic combining inverter control method as claimed in claim 2, it is characterised in that dq is sat
Current signal under mark system carries out plus-minus respectively with the dq current component of reference current and compares, and obtains described error
Signal, described error signal output valve after a PI controller gradually levels off to the electricity under dq coordinate system
Pressure reference value.
5. photovoltaic combining inverter control method as claimed in claim 1, it is characterised in that by zero sequence electricity
Stream carries out plus-minus with zero sequence reference current and compares, and the result obtained more afterwards by plus-minus is through the 2nd PI controller
After output valve gradually level off to zero sequence reference current.
6. photovoltaic combining inverter control method as claimed in claim 3, it is characterised in that: α β is sat
Electric current under mark system carries out park conversion and the anti-park conversion carrying out the voltage reference value under dq coordinate system
The most reverse.
7. photovoltaic combining inverter control method as claimed in claim 1, it is characterised in that:
The model of described inversion control model is the mathematical model under three-phase static coordinate system, described inversion control
Model is Passive Shape Control device based on EL equation model.
8. photovoltaic combining inverter control method as claimed in claim 7, it is characterised in that
Described basis is set up inversion control model based on EL equation model and is included:
Obtain three-phase line voltage and the three-phase current of inverter ac side；
Obtain inverter direct-flow side maximum power point voltage and maximum power point electric current；
Three-phase line voltage according to described inverter ac side and three-phase current, and described inverter direct-flow side is
High-power point voltage and maximum power point electric current, set up inversion control model based on EL equation model；
The three-phase line voltage that input is described inverter ac side of described inversion control model and three-phase current,
And described inverter direct-flow side maximum power point voltage and maximum power point electric current；Described inverter is output as
Switch function under three-phase static coordinate system.
9. photovoltaic combining inverter control method as claimed in claim 7, it is characterised in that described basis
Set up inversion control model based on EL equation model to include:
The triple line electric current of described inverter ac side is carried out park conversion, to obtain the friendship under dq coordinate system
Stream side electric current；
Described inverter wiretap function under three-phase static coordinate system is carried out park conversion, it is thus achieved that dq sits
Switch function under mark system；
The three-phase line voltage of described inverter ac side is carried out park conversion, it is thus achieved that the exchange under dq coordinate system
Side voltage；
By the ac-side current under described dq coordinate system, the switch function under dq coordinate system, under dq coordinate system
AC voltage substitute into described inverter mathematical model under three-phase static coordinate system, it is thus achieved that described inversion
Device mathematical model under dq coordinate system；
The inversion control described in the Mathematical Models under dq coordinate system according to EL equation model and described inverter
Simulation.
10. photovoltaic combining inverter control method as claimed in claim 7, it is characterised in that described inverse
Become Controlling model to be output as:
Wherein, Δ S=Sa+Sb+Sc, Sa、Sb、ScIt is respectively the output of described inversion control model at three phase static
Switch function under coordinate system, Sab、Sac、SbcIt is respectively the output of described inversion control model at three phase static
Wiretap function under coordinate system.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108847688A (en) * | 2018-07-23 | 2018-11-20 | 湖北工业大学 | A kind of space vector modulating method of single-phase cascade type photovoltaic DC-to-AC converter |
| CN111049409A (en) * | 2020-01-06 | 2020-04-21 | 阳光电源股份有限公司 | Voltage mixed type clamp type three-level inverter circuit and application device thereof |
| CN112379153A (en) * | 2020-10-30 | 2021-02-19 | 阳光电源股份有限公司 | Direct current oscillation detection circuit, direct current arc detection circuit and inverter |
| CN112491075A (en) * | 2020-11-24 | 2021-03-12 | 宁波伟吉电力科技有限公司 | Novel energy storage inverter control device and control method thereof |
| CN113890398A (en) * | 2021-10-11 | 2022-01-04 | 四川大学 | PR control and PI control equivalent method considering frequency dynamic characteristics |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103368438A (en) * | 2013-05-20 | 2013-10-23 | 江苏兆伏新能源有限公司 | Inversion control method of photovoltaic grid-connected inverter |
| CN104362675A (en) * | 2014-10-31 | 2015-02-18 | 北京信息科技大学 | Inverter system and photovoltaic grid inverter control method and device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103368438A (en) * | 2013-05-20 | 2013-10-23 | 江苏兆伏新能源有限公司 | Inversion control method of photovoltaic grid-connected inverter |
| CN104362675A (en) * | 2014-10-31 | 2015-02-18 | 北京信息科技大学 | Inverter system and photovoltaic grid inverter control method and device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108847688A (en) * | 2018-07-23 | 2018-11-20 | 湖北工业大学 | A kind of space vector modulating method of single-phase cascade type photovoltaic DC-to-AC converter |
| CN111049409A (en) * | 2020-01-06 | 2020-04-21 | 阳光电源股份有限公司 | Voltage mixed type clamp type three-level inverter circuit and application device thereof |
| CN112379153A (en) * | 2020-10-30 | 2021-02-19 | 阳光电源股份有限公司 | Direct current oscillation detection circuit, direct current arc detection circuit and inverter |
| CN112491075A (en) * | 2020-11-24 | 2021-03-12 | 宁波伟吉电力科技有限公司 | Novel energy storage inverter control device and control method thereof |
| CN112491075B (en) * | 2020-11-24 | 2022-07-05 | 宁波伟吉电力科技有限公司 | Novel energy storage inverter control device and control method thereof |
| CN113890398A (en) * | 2021-10-11 | 2022-01-04 | 四川大学 | PR control and PI control equivalent method considering frequency dynamic characteristics |
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