CN105515432A - Method for deadbeat control of photovoltaic grid-connected inverter - Google Patents
Method for deadbeat control of photovoltaic grid-connected inverter Download PDFInfo
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- CN105515432A CN105515432A CN201610059549.7A CN201610059549A CN105515432A CN 105515432 A CN105515432 A CN 105515432A CN 201610059549 A CN201610059549 A CN 201610059549A CN 105515432 A CN105515432 A CN 105515432A
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- 238000010586 diagram Methods 0.000 description 4
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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
- 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
- H02M7/5387—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 in a bridge configuration
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- H02J3/383—
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- 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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- Inverter Devices (AREA)
Abstract
The invention provides a method for deadbeat control of a photovoltaic grid-connected inverter. The method comprises the steps of acquiring loop instantaneous voltage according to a loop voltage instantaneous equation; adopting PI control over a direct current side voltage outer ring, and acquiring an output instruction current under direct current side voltage PI control; acquiring a power feedforward current as a modified value; and acquiring an input current value of a current controller according to the output instruction current under the PI control and the power feedforward current. Parameters of a deadbeat control controller are determined through circuit parameters of a whole system, and the parameters are easy to obtain; by introducing the power feedforward current as the modification in grid-connected current reference command signals, the burden on a direct current side voltage controller can be effectively relieved, output characteristics of a control system are enhanced, and thus the control accuracy and response speed are improved.
Description
Technical field
The present invention relates to a kind of control method of inverter, particularly relate to a kind of Implementation of Photovoltaic Grid-Connected Inverter Deadbeat control method.
Background technology
Along with one of renewable energy technologies that solar photovoltaic technology is the most promising, it is the study hotspot outside Present Domestic.Combining inverter is one of core component of photovoltaic generating system, and the effect of its electric current rapid track and control is directly connected to the quality of power supply of parallel network power generation.The sine of general main its grid-connected current of consideration, grid-connected power factor and maintain the stable ability of busbar voltage, therefore the double-loop control mode of outer voltage and current inner loop is also the more common control strategy of current combining inverter.The electrical network connected due to photovoltaic DC-to-AC converter output can regard a disturbance quantity as, therefore adopts current inner loop to control to improve the antijamming capability of photovoltaic system, ensures the quick tracking performance of output current and the stable operation of whole grid-connected system.There is multiple method in current inner loop design, in control strategy, mainly contains Hysteresis control, PI controls (proportional plus integral control), track with zero error etc.Wherein, in PI control, choosing of parameter is the focus studied always.But, in the design process of PI controller, the setting of PI parameter must take into full account stability and the current tracking ability of system, the process of choosing of parameter is comparatively complicated, need could obtain the parameter with better engineering effort through repetition test, if parameter choose is improper, the Harmonics amplification in band segment may be caused, the stable of grid-connected system is affected greatly, even may produce resonance with the equipment component in electrical network to amplify, jeopardize the safety of electrical network, and PI control control precision and response speed all not ideal enough.
Summary of the invention
The invention provides a kind of Implementation of Photovoltaic Grid-Connected Inverter Deadbeat control method, to solve the technical problem that PI control precision is poor and response speed is slow.
The invention provides a kind of Implementation of Photovoltaic Grid-Connected Inverter Deadbeat control method, described Implementation of Photovoltaic Grid-Connected Inverter Deadbeat control method comprises: according to the instantaneous equation of loop voltage, obtains loop instantaneous voltage; DC voltage outer shroud adopts PI to control, and obtains the output order electric current of DC voltage PI control; Obtain power feedforward electric current as correction value; The output order electric current controlled according to described PI and described power feedforward electric current obtain the input current value of current controller.
Preferably, the instantaneous equation of described loop voltage is:
wherein, L
sfor connecting inductance, R
sfor internal resistance, U
invfor port voltage, U
sfor line voltage.
Preferably, the computing formula of described acquisition power feedforward electric current is: I
pf(k)=U
pv(k) I
pv(k)/U
srms(k), wherein, I
pfk () is photovoltaic power feedforward current, U
pvk () is photovoltaic electric current, I
pvk () is photovoltaic electric current, U
srmsk () is line voltage effective value.
The technical scheme that embodiments of the invention provide can comprise following beneficial effect:
The invention provides a kind of Implementation of Photovoltaic Grid-Connected Inverter Deadbeat control method, described Implementation of Photovoltaic Grid-Connected Inverter Deadbeat control method comprises: according to the instantaneous equation of loop voltage, obtains loop instantaneous voltage; DC voltage outer shroud adopts PI to control, and obtains the output order electric current of DC voltage PI control; Obtain power feedforward electric current as correction value; The output order electric current controlled according to described PI and described power feedforward electric current obtain the input current value of current controller.The parameter of track with zero error controller is determined by the circuit parameter of whole system, parameter easily comparatively designs, and by introducing power feedforward electric current as correction in grid-connected current reference instruction signal, effectively can alleviate the burden of DC voltage control device, strengthen the output characteristic of control system, thus improve control precision and response speed.
Should be understood that, it is only exemplary and explanatory that above general description and details hereinafter describe, and can not limit the present invention.
Accompanying drawing explanation
Fig. 1 is the flow chart of the Implementation of Photovoltaic Grid-Connected Inverter Deadbeat control method provided in the embodiment of the present invention;
Fig. 2 is the single-phase grid-connected inverter topology diagram provided in the embodiment of the present invention;
Fig. 3 is the dead beat Current Control Strategy block diagram based on power feedforward provided in the embodiment of the present invention;
Grid-connected voltage and current waveform when Fig. 4 is dead beat Current Control based on power feedforward of the employing that provides in the embodiment of the present invention;
Grid-connected current spectrogram when Fig. 5 is dead beat Current Control based on power feedforward of the employing that provides in the embodiment of the present invention.
Embodiment
Here will be described exemplary embodiment in detail, its sample table shows in the accompanying drawings.When description below relates to accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawing represents same or analogous key element.Execution mode described in following exemplary embodiment does not represent all execution modes consistent with the present invention.On the contrary, they only with as in appended claims describe in detail, the example of device that aspects more of the present invention are consistent.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiment.
Please refer to Fig. 1, the flow chart of the Implementation of Photovoltaic Grid-Connected Inverter Deadbeat control method provided in the embodiment of the present invention is provided.
As shown in Figure 1, the invention provides a kind of Implementation of Photovoltaic Grid-Connected Inverter Deadbeat control method, it is characterized in that, described Implementation of Photovoltaic Grid-Connected Inverter Deadbeat control method comprises: according to the instantaneous equation of loop voltage, obtains loop instantaneous voltage; DC voltage outer shroud adopts PI to control, and obtains the output order electric current of DC voltage PI control; Obtain power feedforward electric current as correction value; The output order electric current controlled according to described PI and described power feedforward electric current obtain the input current value of current controller.
The invention provides a kind of Implementation of Photovoltaic Grid-Connected Inverter Deadbeat control method, described Implementation of Photovoltaic Grid-Connected Inverter Deadbeat control method comprises: according to the instantaneous equation of loop voltage, obtains loop instantaneous voltage; DC voltage outer shroud adopts PI to control, and obtains the output order electric current of DC voltage PI control; Obtain power feedforward electric current as correction value; The output order electric current controlled according to described PI and described power feedforward electric current obtain the input current value of current controller.The parameter of track with zero error controller is determined by the circuit parameter of whole system, parameter easily comparatively designs, and by introducing power feedforward electric current as correction in grid-connected current reference instruction signal, effectively can alleviate the burden of DC voltage control device, strengthen the output characteristic of control system, thus improve control precision and response speed.
Please refer to Fig. 2, the single-phase grid-connected inverter topology diagram provided in the embodiment of the present invention is provided.
As shown in Figure 2, assuming that the current inner loop of combining inverter adopts the dead beat Current Control Strategy based on power feedforward, then the instantaneous equation of the loop voltage of system shown in Figure 2 can be expressed as:
In formula (1), L
sfor connecting inductance, R
sfor internal resistance, U
invfor port voltage, U
sfor line voltage.
Assuming that DC voltage outer shroud adopts PI to control, current inner loop adopts track with zero error, simultaneously in order to strengthen the output characteristic of control system, introduces power feedforward electric current as correction value in grid-connected current reference instruction signal.Current inner loop control block diagram then based on the track with zero error strategy of power feedforward is illustrated in fig. 3 shown below:
By formula (1) discretization, and get di
s=i
s(k+1)-i
sk (), due to R in low-voltage circuit
smuch smaller than L
simpedance, therefore ignore R
simpact, be reduced to:
In formula (2), T
cfor the carrier cycle of PWM, i (k+1) is the voltage-controlled result of calculation of outer shroud, and i (k) is kth time current sample values, and d is switching device Q
1pulse width control amount.Formula (2) is transformed to further:
During practical application, consider the error of calculation, a COEFFICIENT K (0<K<1) is got to d, that is:
Power feedforward electric current is introduced, order in grid-connected current reference instruction signal:
In Fig. 3 and Shi (2) ~ (5), I
refk output order electric current that () controls for DC voltage PI, U
srmsk () is line voltage effective value, I
pfk () is photovoltaic power feedforward current, U
pv(k) and I
pvk () is respectively photovoltaic voltage and photovoltaic electric current.As shown in Figure 3, the input i of current controller
s(k+1) be by power feedforward instruction I
pf(k) and DC voltage control output order I
refk () synthesizes.When photovoltaic system is incorporated into the power networks stable, the feedforward current I of photovoltaic power
pfk () is a stable and larger value, and I
refk () is then a variation and smaller value.If power feedforward can overcome the disturbance of photovoltaic power, then system is when steady operation, only needs the current command signal I that very little
refk () just can export larger grid-connected current, not only can not affect the output characteristic of control system, and can alleviate the burden of DC voltage PI controller.
For verifying above-mentioned conclusion, utilizing simulation software Psim6.0 to build single-phase photovoltaic grid-connected circuit and control circuit, the current inner loop control method of photovoltaic generating system combining inverter being carried out to the simulation analysis of the track with zero error strategy based on power feedforward.Real-time sampling is carried out to the parameter such as output voltage and output current, DC voltage and line voltage of inverter, the duty ratio in power device of inverter (k+l) moment is obtained, by PWM generator driving switch devices function by above-mentioned formulae discovery.Obtain the time domain waveform of line voltage US and grid-connected current IS as shown in Figure 4, the frequency spectrum of grid-connected current IS as shown in Figure 5.
As can be seen from Figure 4, current inner loop adopts the track with zero error strategy based on power feedforward, and after 0.04s, system reaches stable, and grid-connected current and line voltage almost homophase, well achieves Phase Tracking function, makes system have higher power factor.And the resultant distortion rate of simulated measurement grid-connected current is only 2.3%, being far smaller than photovoltaic system grid-connected current resultant distortion rate must not requirement more than 5%.In addition, as can be seen from Figure 5, grid-connected current fundamental voltage amplitude is about 11.5A, and grid-connected gaining merit is about 1800W.And IS is hardly containing frequency glitches.
Carry out theory analysis and simulated effect contrast by the two kinds of conventional control strategies controlled photovoltaic system combining inverter current inner loop, can draw to draw a conclusion:
(1) in the design process of PI controller, the setting of PI parameter must take into full account stability and the current tracking ability of system, the process of choosing of parameter is comparatively complicated, need could obtain the parameter with better engineering effort through repetition test, if parameter choose is improper, the Harmonics amplification in band segment may be caused, the stable of grid-connected system is affected greatly, even may produce resonance with the equipment component in electrical network to amplify, jeopardize the safety of electrical network.And the parameter of track with zero error controller is determined by the circuit parameter of whole system, parameter easily comparatively designs, and by introducing power feedforward electric current as correction in grid-connected current reference instruction signal, effectively can alleviate the burden of DC voltage control device, strengthen the output characteristic of control system.
(2) response speed of track with zero error strategy is faster than the response speed of PI control strategy.
(3) precision of the ratio of precision PI control strategy of track with zero error strategy wants high.The simulation results show of twice above, under same circuit parameter and switching frequency condition, the meritorious output of track with zero error device is than the meritorious output height about 4-5% of PI controller, the phase difference of the grid-connected current that track with zero error strategy is corresponding and line voltage is less, power factor is higher, and the content of output current medium-high frequency burr is also less.This is because track with zero error is the control algolithm based on controlled device exact circuitry model, there is the feature of indifference.And PI controls the existence due to integral element, always can there is certain phase angle tracking lag, therefore PI control strategy can not realize the complete no error following to the signal exchanged.
Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any amendment done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiment.
For convenience of description, various unit is divided into describe respectively with function when describing above device.Certainly, the function of each unit can be realized in same or multiple software and/or hardware when implementing of the present invention.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.Especially, for device or system embodiment, because it is substantially similar to embodiment of the method, so describe fairly simple, relevant part illustrates see the part of embodiment of the method.Apparatus and system embodiment described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any amendment done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
The above is only the specific embodiment of the present invention, those skilled in the art is understood or realizes the present invention.To be apparent to one skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (3)
1. an Implementation of Photovoltaic Grid-Connected Inverter Deadbeat control method, is characterized in that, described Implementation of Photovoltaic Grid-Connected Inverter Deadbeat control method comprises:
According to the instantaneous equation of loop voltage, obtain loop instantaneous voltage;
DC voltage outer shroud adopts PI to control, and obtains the output order electric current of DC voltage PI control;
Obtain power feedforward electric current as correction value;
The output order electric current controlled according to described PI and described power feedforward electric current obtain the input current value of current controller.
2. Implementation of Photovoltaic Grid-Connected Inverter Deadbeat control method according to claim 1, is characterized in that, the instantaneous equation of described loop voltage is:
wherein, L
sfor connecting inductance, R
sfor internal resistance, U
invfor port voltage, U
sfor line voltage.
3. Implementation of Photovoltaic Grid-Connected Inverter Deadbeat control method according to claim 1, is characterized in that, the computing formula of described acquisition power feedforward electric current is: I
pf(k)=U
pv(k) I
pv(k)/U
srms(k), wherein, I
pfk () is photovoltaic power feedforward current, U
pvk () is photovoltaic electric current, I
pvk () is photovoltaic electric current, U
srmsk () is line voltage effective value.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111092559A (en) * | 2020-01-03 | 2020-05-01 | 云南电网有限责任公司电力科学研究院 | Single-phase grid-connected inverter grid-connected and off-grid switching control method and device |
| CN113381414A (en) * | 2021-06-18 | 2021-09-10 | 国网湖南省电力有限公司 | Multi-mode comprehensive control method of dynamic voltage restorer based on super capacitor energy storage |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111092559A (en) * | 2020-01-03 | 2020-05-01 | 云南电网有限责任公司电力科学研究院 | Single-phase grid-connected inverter grid-connected and off-grid switching control method and device |
| CN113381414A (en) * | 2021-06-18 | 2021-09-10 | 国网湖南省电力有限公司 | Multi-mode comprehensive control method of dynamic voltage restorer based on super capacitor energy storage |
| CN113381414B (en) * | 2021-06-18 | 2022-08-23 | 国网湖南省电力有限公司 | Multi-mode comprehensive control method of dynamic voltage restorer based on super capacitor energy storage |
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Application publication date: 20160420 |