CN108681363A - The MPPT control method of constant pressure combination variable step conductance increment - Google Patents
The MPPT control method of constant pressure combination variable step conductance increment Download PDFInfo
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- CN108681363A CN108681363A CN201810914861.9A CN201810914861A CN108681363A CN 108681363 A CN108681363 A CN 108681363A CN 201810914861 A CN201810914861 A CN 201810914861A CN 108681363 A CN108681363 A CN 108681363A
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- conductance increment
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
- G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
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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
Abstract
The invention discloses a kind of MPPT maximum power point tracking (MPPT) control methods of novel constant pressure combination variable step conductance increment, including step：Obtain the open-circuit voltage U of photovoltaic paneloc, output voltage UpvAnd output current Ipv；Maximum power point (MPP) is quickly first approached using constant-voltage method；The conductance increment method for using variable step again, corresponding voltage adjusting step is determined according to the variation relation of P U curves, accurately tracks maximum power point.During the control method of the embodiment of the present invention has handled MPPT maximum power point tracking well, the contradiction between tracking velocity and tracking accuracy can track to fast and stable the maximum power point of photovoltaic panel under complex environment.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, and in particular to a kind of MPPT of constant pressure combination variable step conductance increment
Control method.
Background technology
With the continuous aggravation of world energy sources crisis, using solar energy power generating as the various new energy power generation technologies of representative
Rapid development, numerous countries are using photovoltaic generation as the emphasis of Renewable Energy Development.
The output power of photovoltaic panel and battery temperature, intensity of illumination and load variation are closely related, and present strong non-thread
Property characteristic.But photovoltaic panel, under a specific environment, there are a unique maximum power point (mpp)s (MPP), in order to abundant
Using the energy of photovoltaic panel, maximum power point Output Tracking Control method (MPPT) is substantially used in the industry.
In recent years, various MPPT control methods are suggested, and include mainly：Open circuit voltage method (OCV), constant voltage process
(CVT), perturbation observation method (P＆O), conductance increment method (INC), the various MPPT algorithms etc. based on artificial intelligence.Wherein, INC quilts
Think there is that steady-sxtate wave motion is small, dynamic tracing is fast, environment is adapted to strong and is widely used.Traditional INC is generally used
Fixed step size controls, and this pattern can not balance dynamic property and steady-state behaviour：When selection small step is long, steady-sxtate wave motion can be small, but
The speed of dynamic tracing is with regard to slow；And when choosing big step-length, the speed of dynamic tracing can be fast, but fluctuation can become larger when stable state.
Precision when quick and stable state when how to take into account dynamic, to give full play to the output power of photovoltaic panel, it has also become
The important issue of photovoltaic power generation technology.
Invention content
The present invention provides a kind of MPPT control method of constant pressure combination variable step conductance increment, enables photovoltaic panel in each ring
Maximum power point (mpp) is rapidly tracked under border and stabilization is run near the point.
The present invention provides a kind of MPPT control method of constant pressure combination variable step conductance increment, including step：
A：Photovoltaic panel open-circuit voltage U is obtained before operationoc, when operation obtains the output voltage U of photovoltaic panel in real timepvAnd output
Electric current Ipv；
B：Constant-voltage method is first used, by 0.78UocU is given as target voltageref, wait for photovoltaic panel current output voltage UpvIt connects
Nearly given voltage UrefAfterwards, it is switched to conductance increment method；
C：This output voltage U detectedkSubtract the last output voltage U detectedk-1, obtain voltage deviation dU；
Output current IkSubtract the last output current I detectedk-1, current deviation dI is obtained, it can thus be concluded that power deviation dP, is used
Make the calculating control of conductance increment method；
D：Take absolute value after power deviation dP divided by voltage deviation dU, multiplied by with a suitable coefficient N, using the value as
System adjusts the variable quantity of duty ratio every time, forms variable step conductance increment method；
E：The value for judging dI/dU+I/U, when it is more than zero, system is on the left of MPP, should increase given voltage Uref；When
When it is less than zero, system is on the right side of MPP, should reduce given voltage Uref；When it is equal to zero, system is in MPP, should keep
Given voltage Uref。
Above-mentioned technical proposal can be seen that since the embodiment of the present invention uses the MPPT of constant pressure combination variable step conductance increment
Control mode realizes the maximal power tracing output of photovoltaic panel, therefore the control method of the embodiment of the present invention and traditional control
Method is compared, and tracking is quick, reliable and stable.In startup stage, Isobarically Control is used, is rapidly tracked to most convenient for photovoltaic panel
Near high-power point.After close near maximum power point, system automatically switches to the conductance increment method control of variable step, realizes
While MPPT maximum power point tracking, the fluctuation loss near maximum power point is also reduced, and when environmental condition is mutated, become
The control mode of step-length, energy quick response simultaneously track the maximum power point (mpp) under the environment.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described.
Fig. 1 is the flow chart of the MPPT control method of constant pressure combination variable step conductance increment in the embodiment of the present invention；
Fig. 2 is the functional block diagram of photovoltaic system MPPT in the embodiment of the present invention；
Fig. 3 is the flow chart that constant-voltage method MPPT is realized in the embodiment of the present invention；
Fig. 4 is the flow chart that variable step conductance increment MPPT is realized in the embodiment of the present invention；
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained all other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the present invention provides a kind of MPPT control method of constant pressure combination variable step conductance increment, as shown in Fig. 1,
This method includes：
Step 11：Photovoltaic panel open-circuit voltage U is obtained before operationoc, when operation obtains the output voltage U of photovoltaic panel in real timepvAnd
Output current Ipv。
In this step, current sensor acquisition photovoltaic panel output current I is utilizedpv, photovoltaic panel is acquired using voltage sensor
Open-circuit voltage UocAnd output voltage Upv, then the output power P by can be calculated photovoltaic panel；
Step 12：Constant-voltage method is first used, by 0.78UocU is given as target voltageref, the duty ratio D of regulating system.
Step 13：Judge the output voltage U of photovoltaic panelpvWith target voltage UrefBetween deviation whether setting deviation model
In enclosing.If so, thening follow the steps 14, it is switched to conductance increment method and is adjusted.If it is not, then adjustment duty ratio D, is examined again
It surveys and judges.
Step 14：By detecting the output voltage U before and after photovoltaic panel twice in real timek、Uk-1And output current Ik、 Ik-1,
Output power P before and after calculating twicek、Pk-1And each variable quantity dU, dI, dP.According to the principle of conductance increment method and
The variation relation of P-U curves carries out variable step adjusting to duty ratio, and when so as to solve maximal power tracing, stable state accuracy is high
And dynamic response it is fast between contradiction.
Specific introduction is made to the control method in the embodiment of the present invention below in conjunction with formula.
As shown in Fig. 2, before photovoltaic system operation, the open-circuit voltage U of photovoltaic panel is sampled always by voltage sensoroc, open
After dynamic, constant-voltage method is first used, it is allowed quickly to approach maximum power point (mpp).The target voltage U of photovoltaic panel output at this timerefBy formula 1
It determines.
Uref=0.78*UocFormula 1
In the process, by adjusting duty ratio, make the actual output voltage U of photovoltaic panelkClose to Uref.When between the two
Deviation set deviation ξ within the scope of when, system automatically switches to variable step conductance increment method.Particular flow sheet is as indicated at 3.
As shown in Fig. 2, by voltage sensor and current sensor, front and back output voltage twice can be obtained respectively by measuring
Uk、Uk-1And output current Ik、Ik-1, so as to acquire front and back output power P twicek、Pk-1, each change can be acquired by formula 2
The changing value of amount.
By photovoltaic property it is found that the P-U curves of photovoltaic property are unimodal curves, the maximum power point of existence anduniquess
(MPP), and at peak point there is relationship shown in formula 3.
The basis for estimation that conductance increment method can be obtained by formula 3 is as shown in Equation 4.
The variation delta D of each adjustment duty ratio in the embodiment of the present invention, can be calculated, N is suitable in formula by formula 5
One constant of system, that is, use the mode of variable step.
By above formula change step is finally realized in conjunction with the flow chart that variable step conductance increment MPPT shown in Fig. 4 is realized
The function of long conductance increment MPPT.
For the control method of the present invention compared with traditional control method, tracking is quick, reliable and stable.Constant-voltage method is used to open
It is dynamic, greatly improve the efficiency tracked near maximum power point；The use of variable step conductance increment so that photovoltaic system energy
When extraneous factor variation leads to P-U curvilinear motions, the size of step-length is automatically adjusted：When from MPP farther out, big step-length can make it fast
Speed is approached；When close to MPP, small step-length can make its stable convergence.To solve the contradiction between stable state and dynamic, photovoltaic system is reduced
The loss of system improves capacity usage ratio.
It is provided for the embodiments of the invention the MPPT control method of constant pressure combination variable step conductance increment above, carries out
It is discussed in detail, principle and implementation of the present invention are described for specific case used herein, above example
Illustrate the method and its core concept for being merely used to help understand the present invention；Meanwhile for those of ordinary skill in the art, according to
According to the thought of the present invention, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification
It should not be construed as limiting the invention.
Claims (1)
1. the MPPT control method of constant pressure combination variable step conductance increment, which is characterized in that including step：
A：Photovoltaic panel open-circuit voltage U is obtained before operationoc, when operation obtains the output voltage U of photovoltaic panel in real timepvAnd output current
Ipv；
B：Constant-voltage method is first used, by 0.78UocU is given as target voltageref, wait for photovoltaic panel current output voltage UpvIt is close given
Voltage UrefAfterwards, it is switched to conductance increment method；
C：This output voltage U detectedkSubtract the last output voltage U detectedk-1, obtain voltage deviation dU；Output
Electric current IkSubtract the last output current I detectedk-1, current deviation dI is obtained, it can thus be concluded that power deviation dP, is used as electricity
Lead the calculating control of method of addition；
D：It takes absolute value after power deviation dP divided by voltage deviation dU, multiplied by with a suitable coefficient N, using the value as system
The variable quantity of adjustment duty ratio every time, forms variable step conductance increment method；
E：The value for judging dI/dU+I/U, when it is more than zero, system is on the left of MPP, should increase given voltage Uref；When its is small
When zero, system is on the right side of MPP, should reduce given voltage Uref；When it is equal to zero, system is in MPP, should keep given
Voltage Uref。
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110784011A (en) * | 2019-12-12 | 2020-02-11 | 芜湖倡蓝新能源科技有限责任公司 | Solar energy and commercial power hybrid power supply control air conditioner control mode |
| CN112198924A (en) * | 2020-11-19 | 2021-01-08 | 大连海事大学 | Maximum power point tracking method for photovoltaic cell |
| CN113985956A (en) * | 2021-10-20 | 2022-01-28 | 大连工业大学 | Glass window for improving solar power generation and method for improving photoelectric conversion efficiency of glass window |
| CN114200999A (en) * | 2021-12-09 | 2022-03-18 | 国网山东省电力公司电力科学研究院 | Adaptive variable-step-size maximum power point tracking control method, system and application |
| CN115220522A (en) * | 2022-06-28 | 2022-10-21 | 南通大学 | Maximum power point tracking method based on improved disturbance observation method |
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| CN115220522A (en) * | 2022-06-28 | 2022-10-21 | 南通大学 | Maximum power point tracking method based on improved disturbance observation method |
| CN115220522B (en) * | 2022-06-28 | 2024-02-09 | 南通大学 | Maximum power point tracking method based on improved disturbance observation method |
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