CN109240409A - Photovoltaic DC-to-AC converter electric quantity controlling method, device, computer equipment and storage medium - Google Patents
Photovoltaic DC-to-AC converter electric quantity controlling method, device, computer equipment and storage medium Download PDFInfo
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- CN109240409A CN109240409A CN201811240701.7A CN201811240701A CN109240409A CN 109240409 A CN109240409 A CN 109240409A CN 201811240701 A CN201811240701 A CN 201811240701A CN 109240409 A CN109240409 A CN 109240409A
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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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- H02J3/385—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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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Abstract
This application involves a kind of photovoltaic DC-to-AC converter electric quantity controlling method, device, computer equipment and storage mediums.Method includes: to obtain the corresponding operating power of at least one radiation intensity and operating current；It is calculated according to the corresponding operating power of at least one radiation intensity and operating current and obtains sampling slope；It obtains and refers to slope；Comparison samples slope and refers to slope, adjusts operating voltage according to sampling slope and with reference to the comparing result of slope.Operating voltage is adjusted according to sampling slope and with reference to the comparing result of slope, operating voltage is deviated toward with reference to slope direction, during change in radiation intensity, the variation that voltage corresponding with reference slope is capable of in the variation of voltage is more close, so that not deviate by the corresponding voltage of maximum power point too many for operating voltage, the time for finally returning to practical maximum power point is shorter, and tracking Process Energy loses smaller, the equivalent generated energy for improving photovoltaic DC-to-AC converter.
Description
Technical field
This application involves photovoltaic DC-to-AC converter electricity control technology fields, control more particularly to a kind of photovoltaic DC-to-AC converter electricity
Method, apparatus, computer equipment and storage medium.
Background technique
Photovoltaic combining inverter is directed to MPPT (Maximum Power Point Tracking, maximal power tracing) at present
Used algorithm is generally climbing method or conductance increment method, both algorithms are not very in the fluctuation of sunlight exposure intensity
Substantially good tracking effect can be obtained when acutely, tracking efficiency can achieve 99% or more.But work as sunlight
When radiation intensity is persistently changed from small to big, the algorithm still power contrast according to front and back twice continues the work of PV pole plate
Make voltage toward the disturbance of open-circuit voltage direction until radiation intensity is constant, operating voltage is disturbed further back to real maximum power
Point., whereas if the operating voltage of PV pole plate can also continue toward on the left of maximum power voltage when radiation intensity is descending
Direction disturbance.Although the two can finally be stabilized to new maximum power point, its process undergoes the long period inevitable
Cause certain energy dissipation.
Summary of the invention
Based on this, it is necessary to which providing one kind being capable of photovoltaic DC-to-AC converter electric quantity controlling method, device, computer equipment and storage
Medium.
A kind of photovoltaic DC-to-AC converter electric quantity controlling method, which comprises
Obtain the corresponding operating power of at least one radiation intensity and operating current；
Based on using electric current as abscissa, using power as the coordinate system of ordinate, according to radiation intensity pair described at least one
The operating power answered and the operating current, which calculate, obtains sampling slope；
It obtains and refers to slope；
The sampling slope is compared and described with reference to slope, according to the sampling slope and the comparison knot with reference to slope
Fruit adjusts operating voltage.
In one of the embodiments, the comparison sampling slope and it is described refer to slope, tiltedly according to the sampling
The step of rate and the comparing result with reference to slope adjust operating voltage include:
Compare the sampling slope and described with reference to slope；
When the sampling slope is less than the reference slope, reduce the operating voltage；When the sampling slope is greater than
When the reference slope, increase the operating voltage.
Before the acquisition is with reference to the step of slope in one of the embodiments, further include:
Obtain the corresponding maximum power of multiple radiation intensity and the corresponding optimum current of the maximum power；
Based on using electric current as abscissa, using power as the coordinate system of ordinate, according to the corresponding maximum of multiple radiation intensity
Power and the corresponding optimum current of the maximum power, which calculate to obtain, refers to slope.
In one of the embodiments, it is described based on using electric current as abscissa, using power as the coordinate system of ordinate, according to
Multiple corresponding maximum powers of radiation intensity and the corresponding optimum current of the maximum power are calculated and are obtained with reference to the step of slope
Include:
Based on using electric current as abscissa, using power as the coordinate system of ordinate, determine the corresponding maximum of multiple radiation intensity
The coordinate points of power and the corresponding optimum current of the maximum power on the coordinate system；
The slope of the straight line where multiple coordinate points is calculated, is obtained described with reference to slope.
In one of the embodiments, the comparison sampling slope and it is described refer to slope, tiltedly according to the sampling
The step of rate and the comparing result with reference to slope adjust operating voltage include:
Obtain adjustment amplitude；
The sampling slope is compared and described with reference to slope, according to the sampling slope and the comparison knot with reference to slope
Fruit is adjusted the operating voltage based on the adjustment amplitude.
A kind of photovoltaic DC-to-AC converter electric quantity control unit, described device include:
Sampled data obtains module, for obtaining the corresponding operating power of at least one radiation intensity and operating current；
Sample slope computing module, for based on using electric current as abscissa, using power as the coordinate system of ordinate, according to extremely
A few corresponding operating power of radiation intensity and the operating current, which calculate, obtains sampling slope；
Module is obtained with reference to slope, refers to slope for obtaining；
Voltage regulator module, for comparing the sampling slope and described with reference to slope, according to the sampling slope and institute
State the comparing result adjustment operating voltage with reference to slope.
The voltage regulator module includes: in one of the embodiments,
Slope comparison unit, for comparing the sampling slope and described with reference to slope；
Voltage increases and decreases unit, for reducing the operating voltage when the sampling slope is less than the reference slope；When
When the sampling slope is greater than the reference slope, increase the operating voltage.
In one of the embodiments, further include:
Optimum current obtains module, corresponding for obtaining the corresponding maximum power of multiple radiation intensity and the maximum power
Optimum current；
With reference to slope computing module, for based on using electric current as abscissa, using power as the coordinate system of ordinate, according to more
A corresponding maximum power of radiation intensity and the corresponding optimum current of the maximum power, which calculate to obtain, refers to slope.
A kind of computer equipment can be run on a memory and on a processor including memory, processor and storage
Computer program, the processor perform the steps of when executing the computer program
Obtain the corresponding operating power of at least one radiation intensity and operating current；
Based on using electric current as abscissa, using power as the coordinate system of ordinate, according to radiation intensity pair described at least one
The operating power answered and the operating current, which calculate, obtains sampling slope；
It obtains and refers to slope；
The sampling slope is compared and described with reference to slope, according to the sampling slope and the comparison knot with reference to slope
Fruit adjusts operating voltage.
A kind of computer readable storage medium, is stored thereon with computer program, and the computer program is held by processor
It is performed the steps of when row
Obtain the corresponding operating power of at least one radiation intensity and operating current；
Based on using electric current as abscissa, using power as the coordinate system of ordinate, according to radiation intensity pair described at least one
The operating power answered and the operating current, which calculate, obtains sampling slope；
It obtains and refers to slope；
The sampling slope is compared and described with reference to slope, according to the sampling slope and the comparison knot with reference to slope
Fruit adjusts operating voltage.
Above-mentioned photovoltaic DC-to-AC converter electric quantity controlling method, device, computer equipment and storage medium, according to sampling slope and ginseng
The comparing result for examining slope adjusts operating voltage, and operating voltage is deviated toward with reference to slope direction, and then strong in radiation
It spends in change procedure, the variation of voltage corresponding with reference slope is capable of in the variation of voltage more closely, so that work electricity
Pressure does not deviate by that the corresponding voltage of maximum power point is too many, and the time for finally returning to practical maximum power point is shorter, entire in this way
It is smaller to track Process Energy loss, reduces the loss of energy, the equivalent generated energy for improving photovoltaic DC-to-AC converter.
Detailed description of the invention
Fig. 1 is the flow diagram of photovoltaic DC-to-AC converter electric quantity controlling method in one embodiment；
Fig. 2 is the structural block diagram of photovoltaic DC-to-AC converter electric quantity control unit in one embodiment；
Fig. 3 A is P-V the and P-I set of curves in one embodiment at identical temperature when different radiation intensity；
Fig. 3 B is in one embodiment using traditional climbing method or the tune of the operating voltage of conductance increment method MPPT algorithm
Whole path；
Fig. 3 C is in one embodiment using the adjustment road of the operating voltage of the application photovoltaic DC-to-AC converter electric quantity controlling method
Diameter；
Fig. 4 is the internal structure chart of computer equipment in one embodiment.
Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, not
For limiting the application.
In one embodiment, as shown in Figure 1, providing a kind of photovoltaic DC-to-AC converter electric quantity controlling method, including following step
It is rapid:
Step 120, the corresponding operating power of at least one radiation intensity and operating current are obtained.
In this step, radiation intensity is the radiation intensity of the sun, and specifically, radiation intensity is to shine upon in solar panels
On radiation intensity.Under different radiation intensity, operating power and the operating current difference of solar energy photovoltaic system.In work function
In rate coordinate system corresponding with operating current, under same radiation intensity, the corresponding relationship of operating power and operating current is to sit
A curve in mark system, the curve are P-I curve, and different radiation intensity correspond to different curves, that is to say, that multiple radiation intensity
It will corresponding multiple P-I curves in coordinate system.
In the present embodiment, the corresponding operating power of radiation intensity and operating current are obtained in real time, and obtain the operating power
With coordinate points of the operating current on coordinate system.In one embodiment, obtain the corresponding operating power of multiple radiation intensity and
Operating current.In this way, obtaining multiple corresponding operating powers and operating current, multiple coordinate points on coordinate system are obtained.
In one embodiment, the current corresponding maximum service rating of at least one radiation intensity and and maximum functional are obtained
The corresponding operating current of power.In one embodiment, during radiation Strength Changes, it is strong to obtain at least one radiation
Spend corresponding maximum service rating and operating current corresponding with maximum service rating.In one embodiment, in radiation
During Strength Changes, continuously acquire variation the corresponding maximum service rating of at least one radiation intensity and with maximum functional function
The corresponding operating current of rate.In the present embodiment, the operating power of acquisition is corresponding maximum power under the radiation intensity, that is,
Maximum service rating, the operating current be with the maximum service rating for operating current.Due under same radiation intensity,
The operating power and operating current of solar energy photovoltaic system are corresponding variations, corresponding with the radiation intensity in order to accurately obtain
Operating power and operating current, obtain in the present embodiment the corresponding maximum service rating of at least one radiation intensity and with maximum work
The corresponding operating current of the rate of doing work.When there are multiple radiation intensity, then the corresponding maximum service rating of multiple radiation intensity is obtained
With operating current corresponding with maximum service rating.It is noted that with the variation of time, the radiation intensity of the sun also with
Variation therefore obtaining operating power in real time and when operating current, it will according to the variation of radiation intensity get it is multiple most
Big operating power and it is multiple with respectively with the one-to-one operating current of maximum service rating.
Step 140, based on using electric current as abscissa, using power as the coordinate system of ordinate, according to spoke described at least one
It penetrates the corresponding operating power of intensity and the operating current calculates and obtains sampling slope.
One embodiment is, based on using electric current as abscissa, using power as the coordinate system of ordinate, according at least one institute
The coordinate points calculating of the corresponding operating power of radiation intensity and the operating current in the coordinate system is stated to be sampled
Slope.One embodiment is, based on using electric current as abscissa, using power as the coordinate system of ordinate, according at least one
The line meter of the coordinate points and origin of the corresponding operating power of radiation intensity and the operating current in the coordinate system
It calculates and obtains sampling slope.
Specifically, after obtaining at least one operating power and the corresponding coordinate points of operating current, existed according to coordinate points
Position in coordinate system calculates and obtains the corresponding slope of the coordinate points, that is, sampling slope.Specifically, the coordinate points are corresponding
Slope be straight line where the coordinate points slope, which is the straight line where the line of coordinate points and origin, that is, this implementation
In example, the coordinate points of maximum service rating and corresponding operating current in coordinate system are obtained, the coordinate points and coordinate system are calculated
The slope of straight line where origin, the slope are to sample slope, acquire sampling slope to calculate.
In one embodiment, according to the corresponding maximum service rating of multiple radiation intensity and with the maximum service rating pair
Coordinate points of the operating current answered in coordinate system, the slope of straight line where calculating multiple coordinate points and origin, to count
Calculation acquires sampling slope.It is noted that the corresponding maximum service rating of multiple radiation intensity and with the maximum functional function
The line of coordinate points of the corresponding operating current of rate in coordinate system levels off in a straight line,
Step 160, it obtains and refers to slope.
Specifically, this is the slope prestored with reference to slope, this is used to compare with sampling slope with reference to slope.One reality
Applying example is, this is the corresponding maximum service rating of multiple radiation intensity and work corresponding with maximum service rating electricity with reference to slope
The slope of straight line in a coordinate system where the coordinate points of stream, this is to precalculate, and be pre-stored in the storage of system with reference to slope
In device.
Step 180, compare the sampling slope and it is described refer to slope, according to the sampling slope and described with reference to slope
Comparing result adjust operating voltage.
In the present embodiment, sampling slope is to be calculated to obtain in real time according to the variation of radiation intensity, which may
Change in real time in the presence of according to radiation intensity, and be to be pre-stored in system with reference to slope, for as reference, this to refer to slope not
Become.Since reference slope is constant, in such manner, it is possible in real time compare sampling slope with reference to slope, and tied according to comparison
Fruit adjusts operating voltage, so that operating voltage can be deviated toward with reference to slope direction, and then in change in radiation intensity process
In, the variation of voltage is capable of the variation of voltage corresponding with reference slope more closely, so that operating voltage does not deviate by
The corresponding voltage of maximum power point is too many, and the time for finally returning to practical maximum power point is shorter, entirely tracks process energy in this way
Amount loss is smaller, reduces the loss of energy, the equivalent generated energy for improving photovoltaic DC-to-AC converter.
In above-described embodiment, operating voltage is adjusted according to sampling slope and with reference to the comparing result of slope, so that work electricity
Pressure energy is enough to be deviated toward with reference to slope direction, and then during change in radiation intensity, the variation of voltage can be with reference slope pair
The variation of the voltage answered more closely, so that operating voltage not deviate by the corresponding voltage of maximum power point too many, in spoke
The time that practical maximum power point is returned when penetrating after intensity stabilization is shorter, and entirely tracking Process Energy loses smaller, reduction in this way
The loss of energy, the equivalent generated energy for improving photovoltaic DC-to-AC converter.
In order to realize the adjustment to operating voltage, so that the adjustment of operating voltage is more close to refer to the corresponding electricity of slope
Pressure, in one embodiment, the comparison sampling slope and described with reference to slope, according to the sampling slope and the ginseng
The step of examining the comparing result adjustment operating voltage of slope includes: the comparison sampling slope and described refers to slope；When described
When sampling slope less than the reference slope, reduce the operating voltage；When the sampling slope is greater than the reference slope,
Increase the operating voltage.
Specifically, in a coordinate system, for the numerical value of same ordinate, the slope of straight line is smaller, and the numerical value of abscissa is got over
Greatly.In the present embodiment, since sampling slope is the corresponding maximum service rating of respective radiation intensity with what is all obtained with reference to slope,
Can by sample slope and with reference to slope maximum power be considered as it is equal, in this way, be equivalent to based on identical ordinate to slope into
Row compares, and therefore, when sampling slope less than with reference to slope, shows that sampling the corresponding operating current of slope is greater than with reference to slope pair
The electric current answered, since the P-I curve and P-V curve are equivalent, the corresponding operating current of sampling slope, which is greater than, refers to slope pair
The current equivalence answered is greater than in the corresponding operating voltage of sampling slope refers to the corresponding voltage of slope, therefore, reduces sampling slope
Corresponding operating voltage.And when sampling slope greater than with reference to slope, show that sampling the corresponding operating current of slope is less than reference
Therefore the corresponding electric current of slope is equivalent to the corresponding operating voltage of sampling slope and is less than with reference to the corresponding voltage of slope, therefore,
Increase the corresponding operating voltage of sampling slope.In this way, by reducing or increasing operating voltage, so that operating voltage approaches always
In the voltage of reference slope, that is, repeatedly to the adjustment of operating voltage when, operating voltage can be referred to respectively by both direction
The voltage of slope avoids operating voltage and adjusts in one direction close to adjustment, avoids operating voltage and refers to slope
Variation amount it is increasing, also avoid the current operating power of variation with radiation intensity and refer to slope pair
The maximum service rating offset answered is increasing, enables current operating power always towards the maximum power for referring to slope
Adjustment, the time that practical maximum power point is returned when after radiation intensity is stablized is shorter, so entirely tracking Process Energy loss
It is smaller, reduce the loss of energy, the equivalent generated energy for improving photovoltaic DC-to-AC converter.
In one embodiment, the comparison sampling slope and it is described refer to slope, according to the sampling slope with
The step of comparing result with reference to slope adjusts operating voltage includes: the comparison sampling slope and described refers to slope；
When the sampling slope is less than the reference slope, reduce the operating voltage, so as to adjust the institute after the operating voltage
Sampling slope is stated greater than described with reference to slope；When the sampling slope is greater than the reference slope, increase the operating voltage,
So as to adjust the sampling slope after the operating voltage less than described with reference to slope.
In the present embodiment, when sampling slope is less than the reference slope, after reducing operating voltage, so that operating power is therewith
Variation, the coordinate points of operating power and operating voltage in a coordinate system also change, and the sampling slope calculated in real time will also change
Become, and after adjusting operating voltage, sampling slope will be greater than with reference to slope, in this way, making the corresponding coordinate points of operating voltage by original
This changes on the right side of maximum power point to the left side of maximum power point.Conversely, increasing when sampling slope greater than with reference to slope
After the operating voltage, the sampling slope calculated in real time will also change, and after operating voltage increases, sampling slope will be less than ginseng
Slope is examined, in this way, changing the corresponding coordinate points of operating voltage to maximum power point in the left side of maximum power point by script
Right side.In this way, making operating voltage, accordingly coordinate points are round-trip in the left and right side of maximum power point always, to work
It is too many that voltage does not deviate by maximum power point, and after radiation intensity is stablized, the time for returning to practical maximum power point is shorter, in this way
Entire tracking Process Energy loses smaller, the equivalent generated energy for improving photovoltaic DC-to-AC converter.
In order to accurately calculate actual maximum power and the corresponding straight line of operating current during acquisition change in radiation intensity
Slope, in one embodiment, before described the step of obtaining with reference to slope further include: it is corresponding to obtain multiple radiation intensity
Maximum power and the corresponding optimum current of the maximum power；Based on using electric current as abscissa, using power as the coordinate of ordinate
System calculates and obtains with reference to oblique according to the corresponding maximum power of multiple radiation intensity and the corresponding optimum current of the maximum power
Rate.
It in the present embodiment, pre-establishes using electric current as abscissa, using power as the coordinate system of ordinate, according to having generated
The corresponding maximum power of multiple radiation intensity and with each maximum power multiple optimum currents correspondingly, obtain multiple maximums
The positions of the coordinate points of power and optimum current in a coordinate system calculates multiple maximum powers and optimum current in a coordinate system
The slope of coordinate points in a coordinate system obtains and refers to slope, due to the maximum power and optimum current be generated it is more
Maximum power and optimum current in a radiation intensity, therefore, the maximum power and optimum current can carry out most battery
Effective charging, that is to say, that maximum power and optimum current be under corresponding radiation intensity most efficient charge power and
Charging current, therefore, the reference slope calculated with this have more preferably reference significance, can preferably guide it is current with
The adjustment of the voltage of change in radiation intensity.
In one embodiment, described corresponding according to the corresponding maximum power of multiple radiation intensity and the maximum power
Optimum current further comprises the steps of: storage after calculating acquisition with reference to the step of slope described with reference to slope.
It is executed before step 120 it is noted that the step in the present embodiment can also be, that is to say, that ginseng
The process that the calculating of slope obtains is examined, can be and calculate acquisition before to current radiation Strength Changes, and prestore, in this way,
It can obtain in real time in conjunction with current change in radiation intensity, operating voltage is adjusted, to reduce energy loss, improve power generation
Amount.
For actual maximum power and operating current pair during more accurate acquisition calculating acquisition change in radiation intensity
The slope for the straight line answered, in one embodiment, before the acquisition is with reference to the step of slope further include: under preset temperature,
Obtain the corresponding maximum power of multiple radiation intensity and the corresponding optimum current of the maximum power；Based on electric current be horizontal seat
It marks, using power as the coordinate system of ordinate, it is corresponding according to the corresponding maximum power of multiple radiation intensity and the maximum power
Optimum current, which calculates to obtain, refers to slope.
In the present embodiment, which is environment temperature when photovoltaic DC-to-AC converter working efficiency is larger, the preset temperature
For a relatively stable temperature value, under the preset temperature, photovoltaic DC-to-AC converter can be worked with relatively stable efficiency, so that
It, can be with maximum power output to battery under different radiation intensity.It is noted that the battery of different manufacturers or
The corresponding preset temperature of photovoltaic DC-to-AC converter is different.In this way, being selected when calculating with reference to slope according to battery or photovoltaic DC-to-AC converter
Temperature environment corresponding with preset temperature, to photovoltaic DC-to-AC converter in the corresponding maximum power of multiple radiation intensity and the maximum work
The corresponding optimum current of rate is recorded, and calculates acquisition with reference to slope with this, this is recorded or saved with reference to slope, with
For subsequent in photovoltaic DC-to-AC converter work, which is measured in real time and in real time to the work electricity of photovoltaic DC-to-AC converter
Pressure is adjusted.
It is in one embodiment, described based on using electric current being as abscissa, with power in order to preferably calculate with reference to slope
The coordinate system of ordinate is calculated according to the corresponding maximum power of multiple radiation intensity and the corresponding optimum current of the maximum power
The step of obtaining with reference to slope include: based on using electric current as abscissa, using power as the coordinate system of ordinate, determine multiple radiation
The coordinate points of the corresponding maximum power of intensity and the corresponding optimum current of the maximum power on the coordinate system；It calculates multiple
The slope of straight line where the coordinate points obtains described with reference to slope.
In the present embodiment, pre-establishes using electric current as abscissa, using power as the coordinate system of ordinate, be based on multiple maximums
The positions of the coordinate points of power and optimum current in a coordinate system determines multiple maximum powers and optimum current in a coordinate system
Straight line where coordinate points and origin, the i.e. straight line pass through the coordinate points of multiple maximum powers and optimum current in a coordinate system
And the origin of coordinate system can quickly and accurately calculate acquisition with reference to slope by calculating the slope of the straight line.
In order to reasonably adjust operating voltage, in one embodiment, the comparison sampling slope and the reference
Slope, the step of adjusting operating voltage according to the sampling slope and the comparing result with reference to slope include: to obtain adjustment
Amplitude；Compare the sampling slope and described with reference to slope, according to the sampling slope and the comparing result with reference to slope,
The operating voltage is adjusted based on the adjustment amplitude.
In the present embodiment, adjustment amplitude is Δ V, the i.e. adjusted value of the operating voltage, based on adjustment amplitude to operating voltage
The concrete meaning being adjusted is to increased or decrease adjustment amplitude to operating voltage, the operating voltage after being adjusted.Adjust
Operating voltage afterwards be adjustment before operating voltage and adjustment amplitude the sum of, either, operating voltage adjusted be adjustment
Preceding operating voltage and adjustment amplitude difference.
It is noted that in different embodiments, which can be positive value, or negative value.At one
In embodiment, when adjusting amplitude is positive value, then show to increase operating voltage, when adjusting amplitude is negative value, then table reduces work
Make voltage.In addition, the adjustment amplitude be it is fixed, be also possible to variation.In one embodiment, amplitude is adjusted according to radiation intensity
Variation and change.
In order to realize the adjustment to operating voltage, in one embodiment, adjustment amplitude is 1V to 5V.In one embodiment
In, the absolute value for adjusting amplitude is 1V to 5V.
In order to enable the deviation of operating voltage voltage corresponding with reference slope is smaller, Adjustment precision is improved, in a reality
It applies in example, it is described according to the sampling slope and the comparing result with reference to slope, based on the adjustment amplitude to the work
In the step of being adjusted as voltage, the sampling slope and described bigger with reference to the difference between slope then adjusts amplitude
Absolute value is bigger.
Specifically, operating voltage is adjusted according to adjustment amplitude, if the difference between sampling slope and reference slope
It is bigger, then show that operating voltage voltage deviation corresponding with actual maximum power is larger, if conventionally, adjustment
Amplitude can increase with it so that operating voltage in primary adjustment as close as possible to the corresponding voltage of maximum power, however next
When secondary acquisition sampling slope, under another radiation intensity, operating voltage would be possible to deviate the corresponding voltage of maximum power, need
Operating voltage is adjusted again, in this way, if multipass biggish adjustment amplitude adjusts operating voltage, so that operating voltage
Variation fluctuation it is larger, be equally easy to cause the time for returning to practical maximum power point longer, increase the loss of energy.Cause
This, in the present embodiment, adjustment amplitude does not increase with sampling slope and the increase with reference to the difference between slope, and
It is to adjust amplitude to reduce with the increase of the difference between sampling slope and reference slope, is conducive in this way to operating voltage
Fine tuning, reduces the fluctuation of operating voltage, and operating voltage is come in the two sides of the corresponding voltage of maximum power always
Offset is returned, is conducive to reduce the time for finally returning to practical maximum power point, reduces the loss of energy.
It should be understood that each step in above-described embodiment is not that inevitable order described above successively executes.It removes
Non- to expressly state otherwise herein, there is no stringent sequences to limit for the execution of these steps, these steps can be with others
Sequence executes.Although each step in the flow chart of Fig. 1 successively shows that these steps are not according to the instruction of arrow
The inevitable sequence according to arrow instruction successively executes.Unless expressly stating otherwise herein, there is no tight for the execution of these steps
The sequence of lattice limits, these steps can execute in other order.For example, step 160 can step 120 or 140 it
Preceding execution can also execute between step 120 and step 140.For example, described obtain the corresponding maximum work of multiple radiation intensity
Rate and the corresponding optimum current of the maximum power；Based on using electric current as abscissa, using power as the coordinate system of ordinate, according to
Multiple corresponding maximum powers of radiation intensity and the corresponding optimum current of the maximum power are calculated and are obtained with reference to the step of slope
It can be and execute before step 120.
It is noted that operating voltage is the voltage that solar energy photovoltaic system charges to battery in each embodiment,
Operating current is the electric current that solar energy photovoltaic system charges to battery, and operating power is solar energy photovoltaic system to electric power storage
The power of pond charging.
Here is a specific embodiment:
Fig. 3 A is power vs. voltage (P-V) set of curves and power-current (P- at identical temperature, when different radiation intensity
I) set of curves, in the coordinate system of P-V set of curves in figure 3 a, abscissa is voltage V, and ordinate is power P, P-I set of curves
Coordinate system in, abscissa be electric current I, ordinate is power P.
The radiation intensity sequence of curve 1, curve 2, curve 3 and curve 4 are as follows: 3 > curve of curve 1 > curve, 2 > curve 4.Fig. 3 A
In the vertex of each curve be maximum power point, dotted line is a certain power, if under a certain power, the operating voltage of PV pole plate
Both may be on the right side of maximum power point, it can also be in left-hand point；According to the characteristic of PV pole plate, if it is the product of same manufacturer,
Then each maximum power point of set of curves can be fitted substantially as a linear line, as shown in straight line L and straight line L ' in Fig. 3 A.
Two straight lines can be fitted according to linear function, but straight line L is due to approximately through zero point, thus be easier to obtain it is equivalent tiltedly
Rate.Straight line L is the line of maximum power point and coordinate origin, slope k=P/I of straight line L.It is opposite in default environment temperature
In the case where stabilization, it is worth mentioning at this point that, radiation intensity is basically unchanged at this time, just by acquisition stable operation in maximum work
Power and electric current near rate point carry out digital simulation and obtain corresponding slope k, that is, according to maximum power and with the maximum
The corresponding electric current of power calculates slope k, which, which is used as, refers to slope.This refers to slope and the corresponding data of preset temperature
It can be stored in advance, used when to really there is change in radiation intensity for comparison reference.In practical application, in radiation variation mistake
Cheng Zhong, the PV pole plate operating power and operating current obtained in real time according to sampling calculates current k ' (P/I), if k ' < k,
Then present operating point is on the right side of maximum power point, it is on the contrary then in left side.
In the coordinate system of P-V set of curves in figure 3b, abscissa is voltage V, and ordinate is power P, in fig. 3 c
In the coordinate system of P-V set of curves, abscissa is voltage V, and ordinate is power P.In Fig. 3 B and Fig. 3 C, curve 1, curve 2, curve
3 and curve 4 radiation intensity sequence are as follows: 3 > curve of curve 1 > curve, 2 > curve 4.
As shown in Figure 3B, if not taking any optimisation strategy, common climbing method when radiation intensity is changed from small to big
Or conductance increment method MPPT tracking, operating voltage will be carried out along this path A-B-C-D-E, until radiation intensity stablizes it
Afterwards, real maximum power point is just slowly returned to, this process is generally slower, therefore will necessarily have certain energy loss, is caused
Generated energy is lower.In Fig. 3 C, controlled using the photovoltaic DC-to-AC converter electricity in above-described embodiment, during change in radiation intensity,
Equivalent sampling slope k ' (P/I) is calculated in real time, which is the slope of the straight line of operating power point and coordinate origin,
The k ' is compared with the k being previously stored, if k ' < k, so that it may PV pole plate operating voltage be disturbed to the left side and carried out, that is, subtracted
Small operating voltage, that is to say, that Δ V < 0；, whereas if k ' > k, so that it may disturb PV pole plate operating voltage to the right and carry out, i.e.,
Increase operating voltage, that is to say, that Δ V > 0.In this way, the operating path of PV pole plate will be carried out along A '-B '-C '-D '-E ', thus
Operating voltage does not deviate by that maximum power point is too many, and the time for finally returning to practical maximum power point is shorter, tracking entire in this way
Process Energy loses smaller, the equivalent generated energy for improving photovoltaic DC-to-AC converter.
In one embodiment, as shown in Fig. 2, providing a kind of photovoltaic DC-to-AC converter electric quantity control unit, comprising: hits
Module 250 and voltage regulator module 270 are obtained according to acquisition module 210, sampling slope computing module 230, with reference to slope, in which:
Sampled data obtains module 210 for obtaining the corresponding operating power of at least one radiation intensity and operating current.
Sample slope computing module 230 be used for based on using electric current as abscissa, using power as the coordinate system of ordinate, according to
At least one corresponding operating power of radiation intensity and the operating current, which calculate, obtains sampling slope.
Module 250, which is obtained, with reference to slope refers to slope for obtaining.
Voltage regulator module 270 for comparing the sampling slope and described with reference to slope, according to the sampling slope with
The comparing result with reference to slope adjusts operating voltage.
The voltage regulator module includes: in one of the embodiments,
Slope comparison unit, for comparing the sampling slope and described with reference to slope.
Voltage increases and decreases unit, for reducing the operating voltage when the sampling slope is less than the reference slope.When
When the sampling slope is greater than the reference slope, increase the operating voltage.
In one of the embodiments, further include: optimum current obtains module and refers to slope computing module, in which:
It is corresponding for obtaining the corresponding maximum power of multiple radiation intensity and the maximum power that optimum current obtains module
Optimum current.
With reference to slope computing module be used for based on using electric current as abscissa, using power as the coordinate system of ordinate, according to more
A corresponding maximum power of radiation intensity and the corresponding optimum current of the maximum power, which calculate to obtain, refers to slope.
It is described in one of the embodiments, to include: with reference to slope computing module
Coordinate points determination unit, for based on using electric current as abscissa, using power as the coordinate system of ordinate, determine multiple
The coordinate points of the corresponding maximum power of radiation intensity and the corresponding optimum current of the maximum power on the coordinate system.
With reference to slope calculation unit SCU, for calculating the slope of the straight line where multiple coordinate points, the reference is obtained
Slope.
The voltage regulator module includes: in one of the embodiments,
Amplitude acquiring unit is adjusted, for obtaining adjustment amplitude.
Voltage-adjusting unit, for comparing the sampling slope and described with reference to slope, according to the sampling slope and institute
The comparing result with reference to slope is stated, the operating voltage is adjusted based on the adjustment amplitude.
Specific restriction about photovoltaic DC-to-AC converter electric quantity control unit may refer to above for photovoltaic DC-to-AC converter electricity
The restriction of control method, details are not described herein.Modules in above-mentioned photovoltaic DC-to-AC converter electric quantity control unit can whole or portion
Divide and is realized by software, hardware and combinations thereof.Above-mentioned each module can be embedded in the form of hardware or independently of computer equipment
In processor in, can also be stored in a software form in the memory in computer equipment, in order to processor calling hold
The corresponding operation of the above modules of row.
In one embodiment, a kind of computer equipment is provided, in the present embodiment, which is photovoltaic control
Device processed, internal structure chart can be as shown in Figure 4.The photovoltaic controller includes the processor connected by system bus, storage
Device.Wherein, the processor of the photovoltaic controller is for providing calculating and control ability.The memory of the photovoltaic controller includes non-
Volatile storage medium, built-in storage.The non-volatile memory medium is stored with operating system, operation program and database.It should
Built-in storage provides environment for the operation of operating system and operation machine program in non-volatile memory medium.The photovoltaic controller
Database for store refer to slope.To realize a kind of photovoltaic DC-to-AC converter electricity control when the operation program is executed by processor
Method.
It will be understood by those skilled in the art that structure shown in Fig. 4, only part relevant to application scheme is tied
The block diagram of structure does not constitute the restriction for the computer equipment being applied thereon to application scheme, specific computer equipment
It may include perhaps combining certain components or with different component layouts than more or fewer components as shown in the figure.
In one embodiment, a kind of computer equipment is provided, including memory, processor and storage are on a memory
And the computer program that can be run on a processor, processor perform the steps of when executing computer program
Obtain the corresponding operating power of at least one radiation intensity and operating current.
Based on using electric current as abscissa, using power as the coordinate system of ordinate, according to radiation intensity pair described at least one
The operating power answered and the operating current, which calculate, obtains sampling slope.
It obtains and refers to slope.
The sampling slope is compared and described with reference to slope, according to the sampling slope and the comparison knot with reference to slope
Fruit adjusts operating voltage.
In one embodiment, it is also performed the steps of when processor executes computer program
Compare the sampling slope and described with reference to slope.
When the sampling slope is less than the reference slope, reduce the operating voltage.When the sampling slope is greater than
When the reference slope, increase the operating voltage.
In one embodiment, it is also performed the steps of when processor executes computer program
Obtain the corresponding maximum power of multiple radiation intensity and the corresponding optimum current of the maximum power.
Based on using electric current as abscissa, using power as the coordinate system of ordinate, according to the corresponding maximum of multiple radiation intensity
Power and the corresponding optimum current of the maximum power, which calculate to obtain, refers to slope.
In one embodiment, it is also performed the steps of when processor executes computer program
Based on using electric current as abscissa, using power as the coordinate system of ordinate, determine the corresponding maximum of multiple radiation intensity
The coordinate points of power and the corresponding optimum current of the maximum power on the coordinate system.
The slope of the straight line where multiple coordinate points is calculated, is obtained described with reference to slope.
In one embodiment, it is also performed the steps of when processor executes computer program
Obtain adjustment amplitude.
The sampling slope is compared and described with reference to slope, according to the sampling slope and the comparison knot with reference to slope
Fruit is adjusted the operating voltage based on the adjustment amplitude.
In one embodiment, a kind of computer readable storage medium is provided, computer program is stored thereon with, is calculated
Machine program performs the steps of when being executed by processor
Obtain the corresponding operating power of at least one radiation intensity and operating current.
Based on using electric current as abscissa, using power as the coordinate system of ordinate, according to radiation intensity pair described at least one
The operating power answered and the operating current, which calculate, obtains sampling slope.
It obtains and refers to slope.
The sampling slope is compared and described with reference to slope, according to the sampling slope and the comparison knot with reference to slope
Fruit adjusts operating voltage.
In one embodiment, it is also performed the steps of when computer program is executed by processor
Compare the sampling slope and described with reference to slope.
When the sampling slope is less than the reference slope, reduce the operating voltage.When the sampling slope is greater than
When the reference slope, increase the operating voltage.
In one embodiment, it is also performed the steps of when computer program is executed by processor
Obtain the corresponding maximum power of multiple radiation intensity and the corresponding optimum current of the maximum power.
Based on using electric current as abscissa, using power as the coordinate system of ordinate, according to the corresponding maximum of multiple radiation intensity
Power and the corresponding optimum current of the maximum power, which calculate to obtain, refers to slope.
In one embodiment, it is also performed the steps of when computer program is executed by processor
Based on using electric current as abscissa, using power as the coordinate system of ordinate, determine the corresponding maximum of multiple radiation intensity
The coordinate points of power and the corresponding optimum current of the maximum power on the coordinate system.
The slope of the straight line where multiple coordinate points is calculated, is obtained described with reference to slope.
In one embodiment, it is also performed the steps of when computer program is executed by processor
Obtain adjustment amplitude.
The sampling slope is compared and described with reference to slope, according to the sampling slope and the comparison knot with reference to slope
Fruit is adjusted the operating voltage based on the adjustment amplitude.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the computer program can be stored in a non-volatile computer
In read/write memory medium, the computer program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein,
To any reference of memory, storage, database or other media used in each embodiment provided herein,
Including non-volatile and/or volatile memory.Nonvolatile memory may include read-only memory (ROM), programming ROM
(PROM), electrically programmable ROM (EPROM), electrically erasable ROM (EEPROM) or flash memory.Volatile memory may include
Random access memory (RAM) or external cache.By way of illustration and not limitation, RAM is available in many forms,
Such as static state RAM (SRAM), dynamic ram (DRAM), synchronous dram (SDRAM), double data rate sdram (DDRSDRAM), enhancing
Type SDRAM (ESDRAM), synchronization link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM
(RDRAM), direct memory bus dynamic ram (DRDRAM) and memory bus dynamic ram (RDRAM) etc..
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the concept of this application, various modifications and improvements can be made, these belong to the protection of the application
Range.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (10)
1. a kind of photovoltaic DC-to-AC converter electric quantity controlling method, which is characterized in that the described method includes:
Obtain the corresponding operating power of at least one radiation intensity and operating current；
Based on using electric current as abscissa, using power as the coordinate system of ordinate, it is corresponding according to radiation intensity described at least one
The operating power and the operating current, which calculate, obtains sampling slope；
It obtains and refers to slope；
The sampling slope is compared and described with reference to slope, according to the sampling slope and the comparing result tune with reference to slope
Whole operating voltage.
2. the method according to claim 1, wherein the comparison sampling slope and described with reference to slope,
The step of adjusting operating voltage according to the sampling slope and the comparing result with reference to slope include:
Compare the sampling slope and described with reference to slope；
When the sampling slope is less than the reference slope, reduce the operating voltage；Described in being greater than when the sampling slope
When with reference to slope, increase the operating voltage.
3. the method according to claim 1, wherein before the acquisition is with reference to the step of slope further include:
Obtain the corresponding maximum power of multiple radiation intensity and the corresponding optimum current of the maximum power；
Based on using electric current as abscissa, using power as the coordinate system of ordinate, according to the corresponding maximum power of multiple radiation intensity
Optimum current corresponding with the maximum power, which calculates to obtain, refers to slope.
4. according to the method described in claim 3, it is characterized in that, described be based on using electric current being vertical seat as abscissa, with power
Target coordinate system is calculated and is obtained according to the corresponding maximum power of multiple radiation intensity and the corresponding optimum current of the maximum power
Include: with reference to the step of slope
Based on using electric current as abscissa, using power as the coordinate system of ordinate, determine the corresponding maximum power of multiple radiation intensity
Coordinate points of the optimum current corresponding with the maximum power on the coordinate system；
The slope of the straight line where multiple coordinate points is calculated, is obtained described with reference to slope.
5. the method according to claim 1, which is characterized in that described to compare the sampling slope and institute
The step of stating with reference to slope, adjusting operating voltage according to the sampling slope and the comparing result with reference to slope include:
Obtain adjustment amplitude；
Compare the sampling slope and described with reference to slope, according to the sampling slope and the comparing result with reference to slope,
The operating voltage is adjusted based on the adjustment amplitude.
6. a kind of photovoltaic DC-to-AC converter electric quantity control unit, which is characterized in that described device includes:
Sampled data obtains module, for obtaining the corresponding operating power of at least one radiation intensity and operating current；
Sample slope computing module, for based on using electric current as abscissa, using power as the coordinate system of ordinate, according at least one
A corresponding operating power of the radiation intensity and the operating current, which calculate, obtains sampling slope；
Module is obtained with reference to slope, refers to slope for obtaining；
Voltage regulator module, for comparing the sampling slope and described with reference to slope, according to the sampling slope and the ginseng
Examine the comparing result adjustment operating voltage of slope.
7. device according to claim 6, which is characterized in that the voltage regulator module includes:
Slope comparison unit, for comparing the sampling slope and described with reference to slope；
Voltage increases and decreases unit, for reducing the operating voltage when the sampling slope is less than the reference slope；When described
When sampling slope greater than the reference slope, increase the operating voltage.
8. device according to claim 6, which is characterized in that further include:
Optimum current obtains module, corresponding most for obtaining the corresponding maximum power of multiple radiation intensity and the maximum power
Good electric current；
With reference to slope computing module, for based on using electric current as abscissa, using power as the coordinate system of ordinate, according to multiple spokes
It penetrates the corresponding maximum power of intensity and the corresponding optimum current of the maximum power is calculated and obtained with reference to slope.
9. a kind of computer equipment including memory, processor and stores the meter that can be run on a memory and on a processor
Calculation machine program, which is characterized in that the processor realizes any one of claims 1 to 5 institute when executing the computer program
The step of stating method.
10. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the computer program
The step of method described in any one of claims 1 to 5 is realized when being executed by processor.
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