CN109254616A - A kind of input power control method and photovoltaic DC-to-AC converter - Google Patents
A kind of input power control method and photovoltaic DC-to-AC converter Download PDFInfo
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- CN109254616A CN109254616A CN201811177484.1A CN201811177484A CN109254616A CN 109254616 A CN109254616 A CN 109254616A CN 201811177484 A CN201811177484 A CN 201811177484A CN 109254616 A CN109254616 A CN 109254616A
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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 present invention provides a kind of input power control method and photovoltaic DC-to-AC converter, which obtains the characteristic parameter of the input feature vector curve of photovoltaic DC-to-AC converter first.It is then based on characteristic parameter, determines the type of input feature vector curve.When the type of input feature vector curve is the first kind, control photovoltaic DC-to-AC converter executes the first optimizing algorithm, obtains first object input power.When the type of input feature vector curve is Second Type, the work of control photovoltaic DC-to-AC converter obtains the second target input power in the first point of fixed potential or the first fixed voltage section.It can be seen that, this programme is first determined the type of input feature vector curve, and based on different types, different control methods is selected, such as, when input feature vector curve is the curve of Fig. 1, point of fixed potential or voltage range are determined when input feature vector curve is the curve of Fig. 2 using optimizing algorithm, so that the voltage of photovoltaic DC-to-AC converter does not fluctuate or fluctuate smaller, the stable operation of photovoltaic DC-to-AC converter has been ensured.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, and in particular to a kind of input power control method and photovoltaic inversion
Device.
Background technique
Photovoltaic DC-to-AC converter can directly be connected with photovoltaic battery panel, at this point, as shown in Figure 1, the output work of photovoltaic battery panel
Rate curve P=f (u) is in non-linear relation, and output power can change with the variation of output voltage, and there are optimal work
Point, i.e. maximum power point MPP.In general, photovoltaic DC-to-AC converter is clicked through using maximum power of first optimizing algorithm to photovoltaic battery panel
Row capture obtains maximum output power P to realize the output voltage u by adjusting photovoltaic battery panel.
Except this, as the application scenarios of photovoltaic DC-to-AC converter are more and more extensive, photovoltaic DC-to-AC converter can be applied in photovoltaic electric
The scene being connected again with photovoltaic DC-to-AC converter after pond plate connection power optimization device.At this point, the input feature vector curve of photovoltaic DC-to-AC converter is such as
Shown in Fig. 2, maximum power point MPP becomes optimal work line segment MN, i.e. photovoltaic DC-to-AC converter work is between M point and N point
When any voltage, photovoltaic DC-to-AC converter can get maximum output power.
However, above-mentioned first optimizing algorithm in the case of figure 2 and is not suitable for, the input voltage of photovoltaic DC-to-AC converter will lead to
It is constantly fluctuated between M point and N point, the fluctuation of voltage will affect photovoltaic DC-to-AC converter and be unable to stable operation, and then reduce photovoltaic
The service life of inverter.
Therefore, how a kind of photovoltaic DC-to-AC converter is provided, maximum input power point, and stable operation can be obtained, is this
A field technical staff big technical problem urgently to be resolved.
Summary of the invention
In view of this, maximum input power point can be obtained the embodiment of the invention provides a kind of photovoltaic DC-to-AC converter, and
Stable operation.
To achieve the above object, the embodiment of the present invention provides the following technical solutions:
A kind of input power control method is applied to photovoltaic DC-to-AC converter, comprising:
Obtain the characteristic parameter of the input feature vector curve of the photovoltaic DC-to-AC converter；
Based on the characteristic parameter, the type of the input feature vector curve is determined；
When the type of the input feature vector curve is the first kind, controls the photovoltaic DC-to-AC converter and execute the first optimizing calculation
Method obtains first object input power；
When the type of the input feature vector curve is Second Type, it is fixed first to control the photovoltaic DC-to-AC converter work
Electrical voltage point or the first fixed voltage section obtain the second target input power.
Optionally, the characteristic parameter of the input feature vector curve for obtaining the photovoltaic DC-to-AC converter, comprising:
Presently described input feature vector curve is traversed, virtual voltage area when power voltage change rate is less than first threshold is obtained
Between；
Correspondingly, described be based on the characteristic parameter, the type of the input feature vector curve is determined, comprising:
The virtual voltage section is compared with target voltage section, when the virtual voltage section be contained in it is described
When target voltage section, determine that the type of the input feature vector curve is the first kind；When the target voltage section is wrapped
When contained in the virtual voltage section, determine that the type of the input feature vector curve is the Second Type, the target voltage
Section is setting voltage range when power voltage change rate is less than first threshold.
Optionally, the characteristic parameter of the input feature vector curve for obtaining the photovoltaic DC-to-AC converter, comprising:
Presently described input feature vector curve is traversed, power variation rate and voltage change ratio in preset time period are obtained；
Correspondingly, described be based on the characteristic parameter, the type of the input feature vector curve is determined, comprising:
When the power variation rate is higher than second threshold and the voltage change ratio is lower than third threshold value, determine described defeated
The type for entering indicatrix is the first kind；
When the power variation rate is lower than the second threshold and the voltage change ratio is higher than the third threshold value, really
The type of the fixed input feature vector curve is the Second Type.
Optionally, the characteristic parameter of the input feature vector curve for obtaining the photovoltaic DC-to-AC converter, comprising:
The electricity of the first power and the inverter when voltage for obtaining the photovoltaic DC-to-AC converter is the first predeterminated voltage
The second power when pressure is the second predeterminated voltage；
Correspondingly, described be based on the characteristic parameter, the type of the input feature vector curve is determined, comprising:
Judge the absolute value of the difference of first power and second power whether less than the first predetermined power difference,
If so, determining that the type of the input feature vector curve is the Second Type, if not, determining the input feature vector curve
Type is the first kind.
Optionally, the control photovoltaic DC-to-AC converter work is in the first point of fixed potential, comprising:
Obtain the lower voltage limit value and upper limit voltage value of the input feature vector curve target power line segment；
Obtain the output network voltage of the photovoltaic DC-to-AC converter；
The minimum input electricity of the photovoltaic DC-to-AC converter is calculated in output network voltage based on the photovoltaic DC-to-AC converter
Pressure；
Compare the minimum input voltage, the lower voltage limit value and the upper limit voltage value, when the minimum input
Voltage is greater than the lower voltage limit value, and when being less than the upper limit voltage value, determines that the minimum input voltage is described first
Point of fixed potential；When the minimum input voltage is less than the lower voltage limit value, determine that the lower voltage limit value is described the
One point of fixed potential；When the minimum input voltage is greater than the upper limit voltage value, determine that the minimum input voltage is institute
State the first point of fixed potential.
Optionally, the photovoltaic DC-to-AC converter includes DC/DC DC converter, the minimum input voltage, institute
State lower voltage limit value and the upper limit voltage value, comprising:
When the minimum input voltage is greater than the lower voltage limit value, and is less than the upper limit voltage value, described in determination
Minimum input voltage is first point of fixed potential, controls the DC/DC DC converter and is in stop working state；Work as institute
When stating minimum input voltage less than the lower voltage limit value, determine that the lower voltage limit value is first point of fixed potential, control
It makes the DC/DC DC converter and is in stop working state；When the minimum input voltage is greater than the upper limit voltage value,
It determines that the upper limit voltage value is first point of fixed potential, controls the DC/DC DC converter and be in boosting work shape
State.
Optionally, the control photovoltaic DC-to-AC converter work is in the first point of fixed potential, comprising:
Traverse the input feature vector curve, voltage power supply point when determination power output maximum is first fixed voltage
Point.
Optionally, the control photovoltaic DC-to-AC converter work is in the first fixed voltage section, comprising:
Traverse the input feature vector curve, voltage power supply point U when determination power output maximumMN；
Determine voltage range [UMN-(U2-U1)/2,UMN+(U2-U1)/2] it is first fixed voltage section, wherein U2
It is less than the maximum value for setting voltage range when first threshold for power voltage change rate, U1 is that power voltage change rate is less than
The minimum value of setting voltage range when first threshold.
A kind of photovoltaic DC-to-AC converter, comprising:
Obtain module, the characteristic parameter of the input feature vector curve for obtaining the photovoltaic DC-to-AC converter；
First determining module determines the type of the input feature vector curve for being based on the characteristic parameter；
Control module, for controlling the photovoltaic DC-to-AC converter when the type of the input feature vector curve is the first kind
The first optimizing algorithm is executed, first object input power is obtained；When the type of the input feature vector curve is Second Type, control
The photovoltaic DC-to-AC converter work is made in the first point of fixed potential or the first fixed voltage section, obtains the second target input power.
Optionally, the acquisition module includes:
First Traversal Unit obtains power voltage change rate less than first for traversing presently described input feature vector curve
Virtual voltage section when threshold value；
Correspondingly, first determining module includes:
First comparing unit, for the virtual voltage section to be compared with target voltage section, when the reality
When voltage range is contained in the target voltage section, determine that the type of the input feature vector curve is the first kind；When
When the target voltage section is contained in the virtual voltage section, determine that the type of the input feature vector curve is described second
Type, the target voltage section are setting voltage range when power voltage change rate is less than first threshold.
Optionally, the acquisition module includes:
Second Traversal Unit obtains the changed power in preset time period for traversing presently described input feature vector curve
Rate and voltage change ratio；
Correspondingly, first determining module includes:
Second comparing unit, for when the power variation rate is higher than second threshold and the voltage change ratio is lower than third
When threshold value, determine that the type of the input feature vector curve is the first kind；When the power variation rate is lower than described second
When threshold value and the voltage change ratio are higher than the third threshold value, determine that the type of the input feature vector curve is second class
Type.
Optionally, the acquisition module includes:
First acquisition unit, the first power when the voltage for obtaining the photovoltaic DC-to-AC converter is the first predeterminated voltage,
And the voltage of the inverter be the second predeterminated voltage when the second power；
Correspondingly, first determining module includes:
Judgment module, whether the absolute value for judging first power with the difference of second power is less than first
Predetermined power difference, if so, determining that the type of the input feature vector curve is the Second Type, if not, described in determining
The type of input feature vector curve is the first kind.
Optionally, the control module includes:
Second acquisition unit, for obtaining the lower voltage limit value and the upper limit of the input feature vector curve target power line segment
Voltage value；
Third acquiring unit, for obtaining the output network voltage of the photovoltaic DC-to-AC converter；
The photovoltaic DC-to-AC converter is calculated for the output network voltage based on the photovoltaic DC-to-AC converter in computing unit
Minimum input voltage；
Comparing unit is used for the minimum input voltage, the lower voltage limit value and the upper limit voltage value, when
The minimum input voltage is greater than the lower voltage limit value, and when being less than the upper limit voltage value, determines the minimum input electricity
Pressure is first point of fixed potential；When the minimum input voltage is less than the lower voltage limit value, determine it is described under ration the power supply
Pressure value is first point of fixed potential；When the minimum input voltage is greater than the upper limit voltage value, the minimum is determined
Input voltage is first point of fixed potential.
Optionally, the photovoltaic DC-to-AC converter includes DC/DC DC converter, and the comparing unit includes:
Comparing subunit for being greater than the lower voltage limit value when the minimum input voltage, and is less than on described and rations the power supply
When pressure value, determines that the minimum input voltage is first point of fixed potential, control the DC/DC DC converter and be in
Stop working state；When the minimum input voltage is less than the lower voltage limit value, determine that the lower voltage limit value is described
First point of fixed potential controls the DC/DC DC converter and is in stop working state；When the minimum input voltage is greater than
When the upper limit voltage value, determines that the upper limit voltage value is first point of fixed potential, control the DC/DC DC converting
Device is in boosting working condition.
Optionally, the control module includes:
First spider module, the voltage power supply point for traversing the input feature vector curve, when determination power output maximum
For first point of fixed potential.
Optionally, the control module further include:
Second spider module, the voltage power supply point for traversing the input feature vector curve, when determination power output maximum
UMN；
Second determining module, for determining voltage range [UMN-(U2-U1)/2,UMN+(U2-U1)/2] it is described first fixed
Voltage range, wherein U2 is the maximum value for setting voltage range when power voltage change rate is less than first threshold, and U1 is power
Voltage change ratio is less than the minimum value for setting voltage range when first threshold.
Based on the above-mentioned technical proposal, the present invention provides a kind of input power control methods, are applied to photovoltaic DC-to-AC converter, first
First obtain the characteristic parameter of the input feature vector curve of the photovoltaic DC-to-AC converter.It is then based on the characteristic parameter, is determined described defeated
Enter the type of indicatrix.When the type of the input feature vector curve is the first kind, controls the photovoltaic DC-to-AC converter and execute
First optimizing algorithm obtains first object input power.When the type of the input feature vector curve is Second Type, institute is controlled
Photovoltaic DC-to-AC converter work is stated in the first point of fixed potential or the first fixed voltage section, obtains the second target input power.As it can be seen that
This programme is first determined the type of input feature vector curve, and based on different types, selects different control methods, example
Such as, it when input feature vector curve is the curve of Fig. 1, is determined using optimizing algorithm when input feature vector curve is the curve of Fig. 2
Point of fixed potential or voltage range have ensured photovoltaic DC-to-AC converter so that the voltage of photovoltaic DC-to-AC converter does not fluctuate or fluctuate smaller
Stable operation.
Detailed description of the invention
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 technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of schematic diagram of input feature vector curve of photovoltaic DC-to-AC converter；
Fig. 2 is the schematic diagram of another input feature vector curve of photovoltaic DC-to-AC converter；
Fig. 3 is the voltage fluctuation schematic diagram of photovoltaic DC-to-AC converter；
Fig. 4 is a kind of flow diagram of input power control method provided in an embodiment of the present invention；
Fig. 5 is a kind of another flow diagram of input power control method provided in an embodiment of the present invention；
Fig. 6 is that a kind of input power control method provided in an embodiment of the present invention applies the signal on input feature vector curve
Figure；
Fig. 7 is a kind of another flow diagram of input power control method provided in an embodiment of the present invention；
Fig. 8 is a kind of another flow diagram of input power control method provided in an embodiment of the present invention；
Fig. 9 is a kind of another flow diagram of input power control method provided in an embodiment of the present invention；
Figure 10 is a kind of another flow diagram of input power control method provided in an embodiment of the present invention.
Specific embodiment
In conjunction with background technique it is found that in the case of figure 2 by the application of the first optimizing algorithm, will lead to the defeated of photovoltaic DC-to-AC converter
Enter voltage constantly to fluctuate between M point and N point, the fluctuation of voltage will affect photovoltaic DC-to-AC converter and be unable to stable operation, and then drop
The service life of low photovoltaic DC-to-AC converter.
Specifically, the photovoltaic DC-to-AC converter with DC/DC DC converter is (such as band Boost system for subnormal voltage operation region
Photovoltaic DC-to-AC converter), Boost long-term work will increase photovoltaic DC-to-AC converter loss, efficiency in voltage fluctuation section
It is low.Simultaneously between the corresponding voltage boundary point M and N of output power maximum value, the critical of Boost work may be included
Point will cause Boost frequent switching between operating status and halted state, reduce when voltage fluctuates up and down
The stability and reliability of photovoltaic DC-to-AC converter.
Except this, for high voltage operation area, photovoltaic DC-to-AC converter high-voltage operation, voltage stress is high, power switch tube device
Voltage stress is big, and alternating current filter loss is big, is unfavorable for the stable operation of photovoltaic DC-to-AC converter, influences the service life.
Fig. 3 shows the actual motion effect of photovoltaic DC-to-AC converter, wherein curve 1 is that photovoltaic battery panel connects power optimization
Inverter input voltage curve after device, voltage fluctuation are larger.Curve 2 is that the direct-connected inverter input voltage of photovoltaic battery panel is bent
Line, voltage stabilization.
Based on this, the embodiment of the invention provides a kind of input power control methods, as shown in figure 4, this control method energy
Enough obtain maximum input power point, and stable operation.Specifically, this method comprises:
S11, obtain the photovoltaic DC-to-AC converter input feature vector curve characteristic parameter；
S12, it is based on the characteristic parameter, determines the type of the input feature vector curve；
S13a, when the type of the input feature vector curve is the first kind, control the photovoltaic DC-to-AC converter and execute first
Optimizing algorithm obtains first object input power；
S13b, when the type of the input feature vector curve is Second Type, control photovoltaic DC-to-AC converter work the
One point of fixed potential or the first fixed voltage section obtain the second target input power.
As it can be seen that this programme is first determined the type of input feature vector curve, and based on different types, select different
Control method, for example, when input feature vector curve is the curve of Fig. 1, using optimizing algorithm, when input feature vector curve is Fig. 2
Curve when, determine point of fixed potential or voltage range so that the voltage of photovoltaic DC-to-AC converter do not fluctuate or fluctuate it is smaller, ensure
The stable operation of photovoltaic DC-to-AC converter.
It should be noted that inventor combines Fig. 1 and Fig. 2, the feature of photovoltaic DC-to-AC converter input characteristic curve has been obtained,
It is then based on this feature, judges whether photovoltaic battery panel connects power optimization device, and is provided for different output characteristic curves
Different control methods.
Specifically, how present embodiments providing 3 kinds based on the characteristic parameter, the class of the input feature vector curve is determined
The specific implementation step of type is as follows:
Scheme one:
As shown in figure 5, the acquisition photovoltaic DC-to-AC converter is defeated described in above-mentioned steps S11 in the input power control method
Enter the characteristic parameter of indicatrix, comprising:
S51, the presently described input feature vector curve of traversal, obtain practical electricity when power voltage change rate is less than first threshold
Between pressure area；
Correspondingly, being based on the characteristic parameter described in above-mentioned steps S12, the type of the input feature vector curve is determined, wrap
It includes:
S52, the virtual voltage section is compared with target voltage section, when the virtual voltage section is contained in
When the target voltage section, determine that the type of the input feature vector curve is the first kind；When the target voltage area
Between when being contained in the virtual voltage section, determine that the type of the input feature vector curve is the Second Type, the target
Voltage range is setting voltage range when power voltage change rate is less than first threshold.
Schematically, there are maximum power points by the output characteristic curve P-U of photovoltaic battery panel, as shown in curve a in Fig. 6,
[P near maximum power point MPP1,P2] the power voltage change rate dP/dU in section tends to 0.And photovoltaic battery panel connection power is excellent
Changing device output characteristic curve P-U, there are maximum power line segments, as shown in curve b in Fig. 6, the section maximum power line segment [M, N]
Power voltage change rate dP/dU also tends to 0, and the section [M, N] is much larger than [P1,P2] section.
In the present solution, photovoltaic DC-to-AC converter starts since open-circuit voltage Uoc, the operating voltage section of MPPT is set first
[UMPP1,UMPP2].Secondly, setting first threshold ξ according to the characteristic curve a of photovoltaic battery panel1And first threshold ξ1It is corresponding
Voltage range [U1,U2], wherein voltage range
Later, input characteristic curve, recording power voltage change ratio are traversed in the operating voltage range of photovoltaic DC-to-AC converter
DP/dU < ξ1When corresponding voltage range [U3,U4], define voltage range [U3,U4] it is virtual voltage section, wherein virtual voltage
Section
Then, the virtual voltage section is compared with target voltage section, when virtual voltage section meetsWhen, control photovoltaic DC-to-AC converter is run according to characteristic curve a (first kind), MPP optimizing work is executed,
To obtain optimum output power.When virtual voltage section meetsPhotovoltaic DC-to-AC converter is controlled according to characteristic song
Line b (Second Type) operation, stops MPP optimizing, electrical voltage point or fixed voltage is fixed in the region maximum power line segment MN
Range restraint.
Scheme two:
As shown in fig. 7, the acquisition photovoltaic DC-to-AC converter is defeated described in above-mentioned steps S11 in the input power control method
Enter the characteristic parameter of indicatrix, comprising:
S71, the presently described input feature vector curve of traversal, obtain the power variation rate and voltage change in preset time period
Rate；
Correspondingly, being based on the characteristic parameter described in above-mentioned steps S12, the type of the input feature vector curve is determined, wrap
It includes:
S72, when the power variation rate is higher than second threshold and the voltage change ratio and is lower than third threshold value, determine institute
The type for stating input feature vector curve is the first kind；When the power variation rate is lower than the second threshold and the voltage
When change rate is higher than the third threshold value, determine that the type of the input feature vector curve is the Second Type.
Schematically, photovoltaic DC-to-AC converter is according to normal MPPT mode operation, within setting a period of time, power variation rate
DP/dt is lower than second threshold ξ2, voltage change ratio dU/dt is higher than third threshold xi3When, photovoltaic DC-to-AC converter is transported according to characteristic curve b
Row stops MPP optimizing, electrical voltage point or fixed voltage range restraint is fixed in the region maximum power line segment MN.Otherwise, inverse
Become device to run according to characteristic curve a, MPP optimizing work is executed, to obtain optimum output power.
Scheme three:
As shown in figure 8, the acquisition photovoltaic DC-to-AC converter is defeated described in above-mentioned steps S11 in the input power control method
Enter the characteristic parameter of indicatrix, comprising:
The first power and the inverter when S81, the voltage for obtaining the photovoltaic DC-to-AC converter are the first predeterminated voltage
Voltage be the second predeterminated voltage when the second power；
Correspondingly, being based on the characteristic parameter described in above-mentioned steps S12, the type of the input feature vector curve is determined, wrap
It includes:
S82, judge first power and second power difference absolute value whether less than the first predetermined power
Difference, if so, determining that the type of the input feature vector curve is the Second Type, if not, determining the input feature vector
The type of curve is the first kind.
Schematically, open-circuit voltage Uoc is recorded before photovoltaic DC-to-AC converter starting, quick constant voltage runs to the first predeterminated voltage
0.8*Uoc and the second predeterminated voltage 0.6*Uoc (or other voltage parameters), corresponding first power P 3 of record different voltages point with
And second power P 4, wherein when the absolute value of the first power and the difference of second power | P3-P4 | it is lower than the first default function
When rate difference DELTA P, photovoltaic DC-to-AC converter according to characteristic curve b run, stop MPP optimizing, in the region maximum power line segment MN into
Row point of fixed potential or fixed voltage range restraint.Otherwise, photovoltaic DC-to-AC converter is run according to characteristic curve a, executes MPP optimizing work
Make, to obtain optimum output power.
To sum up, according to upper three schemes, when photovoltaic DC-to-AC converter judges input characteristic curve for curve a, inverter is executed
MPP routine optimizing algorithm.When photovoltaic DC-to-AC converter judges input characteristic curve for curve b, that is, there is maximum power line segment MN, this
When photovoltaic DC-to-AC converter according to point of fixed potential or fixed voltage range restraint.
Specifically, the present embodiment additionally provides the specific implementation side of two kinds of point of fixed potential or fixed voltage range restraint
Method is as follows:
As shown in figure 9, the control photovoltaic DC-to-AC converter work is in the first point of fixed potential, comprising:
S91, the lower voltage limit value and upper limit voltage value for obtaining the input feature vector curve target power line segment；
S92, the output network voltage for obtaining the photovoltaic DC-to-AC converter；
The minimum input of the photovoltaic DC-to-AC converter is calculated in S93, the output network voltage based on the photovoltaic DC-to-AC converter
Voltage；
Minimum input voltage described in S94, comparison, the lower voltage limit value and the upper limit voltage value, when the minimum
Input voltage is greater than the lower voltage limit value, and when being less than the upper limit voltage value, determines that the minimum input voltage is described
First point of fixed potential；When the minimum input voltage is less than the lower voltage limit value, determine the lower voltage limit value for institute
State the first point of fixed potential；When the minimum input voltage is greater than the upper limit voltage value, the minimum input voltage is determined
For first point of fixed potential.
That is, in this example, point of fixed potential control can be using minimum grid-connected voltage as fixed voltage operating point.First
Obtain the lower voltage limit value U of maximum power line segment MNMWith upper limit voltage value UN, then, obtains inverter and exports network voltage Uac,
And the minimum input voltage Udc needed for inverter works normally is calculated according to output network voltage Uac.
Then for the photovoltaic DC-to-AC converter without DC/DC DC converter, the further minimum input voltage, institute
State lower voltage limit value and the upper limit voltage value.
Work as Udc > UM, and Udc < UNWhen, control photovoltaic DC-to-AC converter adjusts input voltage to Udc operation；
As Udc < UMWhen, control photovoltaic DC-to-AC converter adjusts input voltage to UMOperation；
Work as Udc > UNWhen, control photovoltaic DC-to-AC converter adjusts input voltage to Udc operation.
On the basis of the above embodiments, it includes DC/DC DC converting that the present embodiment, which additionally provides a kind of photovoltaic DC-to-AC converter,
The case where device, at this point, the minimum input voltage, the lower voltage limit value and the upper limit voltage value, comprising:
When the minimum input voltage is greater than the lower voltage limit value, and is less than the upper limit voltage value, described in determination
Minimum input voltage is first point of fixed potential, controls the DC/DC DC converter and is in stop working state；Work as institute
When stating minimum input voltage less than the lower voltage limit value, determine that the lower voltage limit value is first point of fixed potential, control
It makes the DC/DC DC converter and is in stop working state；When the minimum input voltage is greater than the upper limit voltage value,
It determines that the upper limit voltage value is first point of fixed potential, controls the DC/DC DC converter and be in boosting work shape
State.
Specifically, the photovoltaic such as Boost DC boosting system is inverse for the photovoltaic DC-to-AC converter with DC/DC DC converter
Become device.
Work as Udc > UM, and Udc < UNWhen, control photovoltaic DC-to-AC converter adjusts input voltage and runs to Udc, and Boost system stops
Work；
As Udc < UMWhen, control photovoltaic DC-to-AC converter adjusts input voltage to UMOperation, Boost system stalls；
Work as Udc > UNWhen, control photovoltaic DC-to-AC converter adjusts input voltage to UNOperation, Boost system carry out boosting work.
On the basis of the above embodiments, it is solid first to additionally provide a kind of control photovoltaic DC-to-AC converter work for this implementation
The specific implementation step of constant voltage point, comprising:
Traverse the input feature vector curve, voltage power supply point when determination power output maximum is first fixed voltage
Point.
Schematically, when obtaining output power maximum during traversal input characteristic curve, corresponding voltage power supply is recorded
Point UMN, with point UMNAs fixed voltage operating point, inverter adjusts input voltage to UMNOperation.
Except this, as shown in Figure 10, the present embodiment additionally provides one kind control photovoltaic DC-to-AC converter work first
The specific implementation in fixed voltage section, comprising:
S101, the traversal input feature vector curve, voltage power supply point U when determination power output maximumMN；
S102, voltage range [U is determinedMN-(U2-U1)/2,UMN+(U2-U1)/2] it is first fixed voltage section,
In, U2 is the maximum value for setting voltage range when power voltage change rate is less than first threshold, and U1 is power voltage change rate
The minimum value of setting voltage range when less than first threshold.
Schematically, photovoltaic DC-to-AC converter is run according to characteristic curve b, as shown in fig. 6, resetting includes maximum power line MN
Or part includes the second operating voltage of MPPT section [U of MNMPP3,UMPP4], whereinWith limit
Determine MPPT operating voltage range, reach and reduce photovoltaic DC-to-AC converter input voltage fluctuation range, it is stable to be conducive to photovoltaic DC-to-AC converter.
Specifically, fixed voltage range restraint can further limit MPPT operating voltage range.In traversal input characteristics
In curve procedures, the corresponding voltage power supply point U of maximum power in the region maximum power line MN is obtainedMN, with UMNFor midpoint setting
MPPT operating voltage section [UMN-(U2-U1)/2,UMN+(U2-U1)/2].For in the MPPT operating voltage section of restriction, light
Volt inverter can execute MPP optimizing work.
On the basis of the above embodiments, the present embodiment additionally provides a kind of photovoltaic DC-to-AC converter, corresponds to the above method,
Include:
Obtain module, the characteristic parameter of the input feature vector curve for obtaining the photovoltaic DC-to-AC converter；
First determining module determines the type of the input feature vector curve for being based on the characteristic parameter；
Control module, for controlling the photovoltaic DC-to-AC converter when the type of the input feature vector curve is the first kind
The first optimizing algorithm is executed, first object input power is obtained；When the type of the input feature vector curve is Second Type, control
The photovoltaic DC-to-AC converter work is made in the first point of fixed potential or the first fixed voltage section, obtains the second target input power.
Optionally, the acquisition module includes:
First Traversal Unit obtains power voltage change rate less than first for traversing presently described input feature vector curve
Virtual voltage section when threshold value；
Correspondingly, first determining module includes:
First comparing unit, for the virtual voltage section to be compared with target voltage section, when the reality
When voltage range is contained in the target voltage section, determine that the type of the input feature vector curve is the first kind；When
When the target voltage section is contained in the virtual voltage section, determine that the type of the input feature vector curve is described second
Type, the target voltage section are setting voltage range when power voltage change rate is less than first threshold.
Optionally, the acquisition module includes:
Second Traversal Unit obtains the changed power in preset time period for traversing presently described input feature vector curve
Rate and voltage change ratio；
Correspondingly, first determining module includes:
Second comparing unit, for when the power variation rate is higher than second threshold and the voltage change ratio is lower than third
When threshold value, determine that the type of the input feature vector curve is the first kind；When the power variation rate is lower than described second
When threshold value and the voltage change ratio are higher than the third threshold value, determine that the type of the input feature vector curve is second class
Type.
Optionally, the acquisition module includes:
First acquisition unit, the first power when the voltage for obtaining the photovoltaic DC-to-AC converter is the first predeterminated voltage,
And the voltage of the inverter be the second predeterminated voltage when the second power；
Correspondingly, first determining module includes:
Judgment module, whether the absolute value for judging first power with the difference of second power is less than first
Predetermined power difference, if so, determining that the type of the input feature vector curve is the Second Type, if not, described in determining
The type of input feature vector curve is the first kind.
Optionally, the control module includes:
Second acquisition unit, for obtaining the lower voltage limit value and the upper limit of the input feature vector curve target power line segment
Voltage value；
Third acquiring unit, for obtaining the output network voltage of the photovoltaic DC-to-AC converter；
The photovoltaic DC-to-AC converter is calculated for the output network voltage based on the photovoltaic DC-to-AC converter in computing unit
Minimum input voltage；
Comparing unit is used for the minimum input voltage, the lower voltage limit value and the upper limit voltage value, when
The minimum input voltage is greater than the lower voltage limit value, and when being less than the upper limit voltage value, determines the minimum input electricity
Pressure is first point of fixed potential；When the minimum input voltage is less than the lower voltage limit value, determine it is described under ration the power supply
Pressure value is first point of fixed potential；When the minimum input voltage is greater than the upper limit voltage value, the minimum is determined
Input voltage is first point of fixed potential.
Optionally, the photovoltaic DC-to-AC converter includes DC/DC DC converter, and the comparing unit includes:
Comparing subunit for being greater than the lower voltage limit value when the minimum input voltage, and is less than on described and rations the power supply
When pressure value, determines that the minimum input voltage is first point of fixed potential, control the DC/DC DC converter and be in
Stop working state；When the minimum input voltage is less than the lower voltage limit value, determine that the lower voltage limit value is described
First point of fixed potential controls the DC/DC DC converter and is in stop working state；When the minimum input voltage is greater than
When the upper limit voltage value, determines that the upper limit voltage value is first point of fixed potential, control the DC/DC DC converting
Device is in boosting working condition.
Optionally, the control module includes:
First spider module, the voltage power supply point for traversing the input feature vector curve, when determination power output maximum
For first point of fixed potential.
Optionally, the control module further include:
Second spider module, the voltage power supply point for traversing the input feature vector curve, when determination power output maximum
UMN；
Second determining module, for determining voltage range [UMN-(U2-U1)/2,UMN+(U2-U1)/2] it is described first fixed
Voltage range, wherein U2 is the maximum value for setting voltage range when power voltage change rate is less than first threshold, and U1 is power
Voltage change ratio is less than the minimum value for setting voltage range when first threshold.
It should be noted that the working principle of this photovoltaic DC-to-AC converter refers to above method embodiment, do not repeat to chat herein
It states.
In conclusion the control method is first the present invention provides a kind of input power control method and photovoltaic DC-to-AC converter
First obtain the characteristic parameter of the input feature vector curve of photovoltaic DC-to-AC converter.It is then based on characteristic parameter, determines input feature vector curve
Type.When the type of input feature vector curve is the first kind, control photovoltaic DC-to-AC converter executes the first optimizing algorithm, obtains first
Target input power.When the type of input feature vector curve is Second Type, the work of control photovoltaic DC-to-AC converter is in the first fixed electricity
Pressure point or the first fixed voltage section obtain the second target input power.As it can be seen that class of this programme first to input feature vector curve
Type is determined, and based on different types, selects different control methods, for example, when the curve that input feature vector curve is Fig. 1
When, point of fixed potential or voltage range are determined, so that photovoltaic when input feature vector curve is the curve of Fig. 2 using optimizing algorithm
The voltage of inverter does not fluctuate or fluctuates smaller, has ensured the stable operation of photovoltaic DC-to-AC converter.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (12)
1. a kind of input power control method, which is characterized in that be applied to photovoltaic DC-to-AC converter, comprising:
Obtain the characteristic parameter of the input feature vector curve of the photovoltaic DC-to-AC converter；
Based on the characteristic parameter, the type of the input feature vector curve is determined；
When the type of the input feature vector curve is the first kind, controls the photovoltaic DC-to-AC converter and executes the first optimizing algorithm,
Obtain first object input power；
When the type of the input feature vector curve is Second Type, the photovoltaic DC-to-AC converter work is controlled in the first fixed voltage
Point or the first fixed voltage section obtain the second target input power.
2. input power control method according to claim 1, which is characterized in that the acquisition photovoltaic DC-to-AC converter
The characteristic parameter of input feature vector curve, comprising:
Presently described input feature vector curve is traversed, virtual voltage section when power voltage change rate is less than first threshold is obtained；
Correspondingly, described be based on the characteristic parameter, the type of the input feature vector curve is determined, comprising:
The virtual voltage section is compared with target voltage section, when the virtual voltage section is contained in the target
When voltage range, determine that the type of the input feature vector curve is the first kind；When the target voltage section is contained in
When the virtual voltage section, determine that the type of the input feature vector curve is the Second Type, the target voltage section
It is less than setting voltage range when first threshold for power voltage change rate.
3. input power control method according to claim 1, which is characterized in that the acquisition photovoltaic DC-to-AC converter
The characteristic parameter of input feature vector curve, comprising:
Presently described input feature vector curve is traversed, power variation rate and voltage change ratio in preset time period are obtained；
Correspondingly, described be based on the characteristic parameter, the type of the input feature vector curve is determined, comprising:
When the power variation rate is higher than second threshold and the voltage change ratio is lower than third threshold value, determine that the input is special
The type for levying curve is the first kind；
When the power variation rate is lower than the second threshold and the voltage change ratio is higher than the third threshold value, institute is determined
The type for stating input feature vector curve is the Second Type.
4. input power control method according to claim 1, which is characterized in that the acquisition photovoltaic DC-to-AC converter
The characteristic parameter of input feature vector curve, comprising:
The first power and the voltage of the inverter when voltage for obtaining the photovoltaic DC-to-AC converter is the first predeterminated voltage are
The second power when the second predeterminated voltage；
Correspondingly, described be based on the characteristic parameter, the type of the input feature vector curve is determined, comprising:
Judge the absolute value of the difference of first power and second power whether less than the first predetermined power difference, if
It is to determine that the type of the input feature vector curve is the Second Type, if not, determining the type of the input feature vector curve
For the first kind.
5. input power control method according to claim 1, which is characterized in that the control photovoltaic DC-to-AC converter work
Make in the first point of fixed potential, comprising:
Obtain the lower voltage limit value and upper limit voltage value of the input feature vector curve target power line segment；
Obtain the output network voltage of the photovoltaic DC-to-AC converter；
The minimum input voltage of the photovoltaic DC-to-AC converter is calculated in output network voltage based on the photovoltaic DC-to-AC converter；
Compare the minimum input voltage, the lower voltage limit value and the upper limit voltage value, when the minimum input voltage
Greater than the lower voltage limit value, and when being less than the upper limit voltage value, determine that the minimum input voltage is described first fixed
Electrical voltage point；When the minimum input voltage is less than the lower voltage limit value, determine that the lower voltage limit value is described first solid
Constant voltage point；When the minimum input voltage is greater than the upper limit voltage value, determine that the minimum input voltage is described the
One point of fixed potential.
6. input power control method according to claim 5, which is characterized in that the photovoltaic DC-to-AC converter includes DC/DC
DC converter, the minimum input voltage, the lower voltage limit value and the upper limit voltage value, comprising:
When the minimum input voltage is greater than the lower voltage limit value, and is less than the upper limit voltage value, the minimum is determined
Input voltage is first point of fixed potential, controls the DC/DC DC converter and is in stop working state；When it is described most
When small input voltage is less than the lower voltage limit value, determines that the lower voltage limit value is first point of fixed potential, control institute
It states DC/DC DC converter and is in stop working state；When the minimum input voltage is greater than the upper limit voltage value, determine
The upper limit voltage value is first point of fixed potential, controls the DC/DC DC converter and is in boosting working condition.
7. a kind of photovoltaic DC-to-AC converter characterized by comprising
Obtain module, the characteristic parameter of the input feature vector curve for obtaining the photovoltaic DC-to-AC converter；
First determining module determines the type of the input feature vector curve for being based on the characteristic parameter；
Control module, for controlling the photovoltaic DC-to-AC converter and executing when the type of the input feature vector curve is the first kind
First optimizing algorithm obtains first object input power；When the type of the input feature vector curve is Second Type, institute is controlled
Photovoltaic DC-to-AC converter work is stated in the first point of fixed potential or the first fixed voltage section, obtains the second target input power.
8. photovoltaic DC-to-AC converter according to claim 7, which is characterized in that the acquisition module includes:
First Traversal Unit obtains power voltage change rate and is less than first threshold for traversing presently described input feature vector curve
When virtual voltage section；
Correspondingly, first determining module includes:
First comparing unit, for the virtual voltage section to be compared with target voltage section, when the virtual voltage
When section is contained in the target voltage section, determine that the type of the input feature vector curve is the first kind；When described
When target voltage section is contained in the virtual voltage section, determine that the type of the input feature vector curve is second class
Type, the target voltage section are setting voltage range when power voltage change rate is less than first threshold.
9. photovoltaic DC-to-AC converter according to claim 7, which is characterized in that the acquisition module includes:
Second Traversal Unit, for traversing presently described input feature vector curve, obtain the power variation rate in preset time period with
And voltage change ratio；
Correspondingly, first determining module includes:
Second comparing unit, for when the power variation rate is higher than second threshold and the voltage change ratio is lower than third threshold value
When, determine that the type of the input feature vector curve is the first kind；When the power variation rate is lower than the second threshold
And the voltage change ratio be higher than the third threshold value when, determine the input feature vector curve type be the Second Type.
10. photovoltaic DC-to-AC converter according to claim 7, which is characterized in that the acquisition module includes:
First acquisition unit, the first power when the voltage for obtaining the photovoltaic DC-to-AC converter is the first predeterminated voltage, and
The second power when the voltage of the inverter is the second predeterminated voltage；
Correspondingly, first determining module includes:
Judgment module, for judging whether the absolute value of difference of first power and second power is default less than first
Power difference, if so, determining that the type of the input feature vector curve is the Second Type, if not, determining the input
The type of indicatrix is the first kind.
11. photovoltaic DC-to-AC converter according to claim 7, which is characterized in that the control module includes:
Second acquisition unit, for obtaining the lower voltage limit value and upper limit voltage of the input feature vector curve target power line segment
Value；
Third acquiring unit, for obtaining the output network voltage of the photovoltaic DC-to-AC converter；
The photovoltaic DC-to-AC converter is calculated most for the output network voltage based on the photovoltaic DC-to-AC converter in computing unit
Small input voltage；
Comparing unit, for the minimum input voltage, the lower voltage limit value and the upper limit voltage value, when described
Minimum input voltage is greater than the lower voltage limit value, and when being less than the upper limit voltage value, determines that the minimum input voltage is
First point of fixed potential；When the minimum input voltage is less than the lower voltage limit value, the lower voltage limit value is determined
For first point of fixed potential；When the minimum input voltage is greater than the upper limit voltage value, the minimum input is determined
Voltage is first point of fixed potential.
12. photovoltaic DC-to-AC converter according to claim 11, which is characterized in that the photovoltaic DC-to-AC converter includes DC/DC direct current
Converter, the comparing unit include:
Comparing subunit for being greater than the lower voltage limit value when the minimum input voltage, and is less than the upper limit voltage value
When, it determines that the minimum input voltage is first point of fixed potential, controls the DC/DC DC converter and be in stopping work
Make state；When the minimum input voltage is less than the lower voltage limit value, determine that the lower voltage limit value is described first solid
Constant voltage point controls the DC/DC DC converter and is in stop working state；When the minimum input voltage is greater than on described
When voltage limit value, determines that the upper limit voltage value is first point of fixed potential, control the DC/DC DC converter and be in
Boosting working condition.
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| CN105515513A (en) * | 2016-01-29 | 2016-04-20 | 阳光电源股份有限公司 | Photovoltaic inverter and control method thereof |
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| CN207780646U (en) * | 2017-12-20 | 2018-08-28 | 阿特斯阳光电力集团有限公司 | Output power of photovoltaic module control device |
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| CN105515513A (en) * | 2016-01-29 | 2016-04-20 | 阳光电源股份有限公司 | Photovoltaic inverter and control method thereof |
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