CN109885124A - Maximum power point determines method, equipment and computer readable storage medium - Google Patents
Maximum power point determines method, equipment and computer readable storage medium Download PDFInfo
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- CN109885124A CN109885124A CN201910183563.1A CN201910183563A CN109885124A CN 109885124 A CN109885124 A CN 109885124A CN 201910183563 A CN201910183563 A CN 201910183563A CN 109885124 A CN109885124 A CN 109885124A
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- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a kind of maximum power points to determine method, this method comprises: obtaining the open-circuit voltage of photovoltaic module, calculates the corresponding voltage lower limit value of maximum power point to be determined and upper voltage limit according to the open-circuit voltage；The actual output voltage of the photovoltaic module is adjusted to the voltage lower limit value, using the voltage lower limit value as starting point, the actual output voltage for controlling the photovoltaic module is incremented by according to preset step-length, and corresponding photovoltaic output power is calculated after being incremented by every time, until the actual output voltage increases to the upper voltage limit；Compare the photovoltaic output power being calculated in the actual output voltage increasing process, using the maximum value in the photovoltaic output power as the maximum power point of the photovoltaic module.The invention also discloses a kind of maximum power points to determine equipment and a kind of computer readable storage medium.The present invention can be realized the maximum power point for quickly and accurately determining photovoltaic module.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation more particularly to maximum power point to determine that method, equipment and computer can
Read storage medium.
Background technique
Photovoltaic generating system refers to the electricity generation system it is not necessary that luminous energy to be directly changed into electric energy by thermal process, the system
It mainly include photovoltaic module, battery, controller and inverter.Wherein the output of photovoltaic module has nonlinear characteristic, and
Output power is illuminated by the light the influence of the factors such as intensity, temperature and load, since photovoltaic module transfer efficiency itself is lower, makes light
It is the important channel improved efficiency that volt component, which is worked in always on maximum power point, therefore carries out MPPT maximum power point tracking
It is the measure that photovoltaic generating system must be taken.
In the prior art, common MPPT maximum power point tracking (Maximum power point tracking, abbreviation
MPPT) algorithm has: constant voltage method, perturbation observation method, increment conductance method, short circuit current method etc..Wherein, perturbation observation method by
Advantage succinct in algorithm, easy to accomplish, unrelated with the electrical characteristic parameter of photovoltaic module and that tracking is high-efficient has obtained extensively
Using, but also suffered from certain drawbacks using perturbation observation method: (1) need global scope to disturb ability after controller starting
Maximum power point is found, this causes starting tracking velocity unhappy, and whole tracking is inefficient；(2) when external environment occurs comparatively fast
When variation, being easily trapped into local optimum causes to judge maximum power point by accident, to lose biggish power, reduces generating efficiency.
Summary of the invention
It is a primary object of the present invention to propose that a kind of maximum power point determines method, equipment and computer-readable storage
Medium, it is intended to realize the maximum power point for quickly and accurately determining photovoltaic module.
To achieve the above object, the present invention provides a kind of maximum power point and determines method, the maximum power point determination side
Method includes the following steps:
The open-circuit voltage for obtaining photovoltaic module, it is corresponding to calculate maximum power point to be determined according to the open-circuit voltage
Voltage lower limit value and upper voltage limit；
The actual output voltage of the photovoltaic module is adjusted to the voltage lower limit value, is with the voltage lower limit value
Starting point controls the actual output voltage of the photovoltaic module and is incremented by according to preset step-length, and calculates after being incremented by every time corresponding
Photovoltaic output power, until the actual output voltage increases to the upper voltage limit；
Compare the photovoltaic output power being calculated in the actual output voltage increasing process, the photovoltaic is exported
Maximum power point of the maximum value as the photovoltaic module in power.
Preferably, it is described according to the open-circuit voltage calculate the corresponding voltage lower limit value of maximum power point to be determined and
The step of upper voltage limit includes:
By the open-circuit voltage multiplied by preset first proportionality coefficient, the maximum power point pair of the photovoltaic module is obtained
The voltage lower limit value answered；
By the open-circuit voltage multiplied by preset second proportionality coefficient, the maximum power point pair of the photovoltaic module is obtained
The upper voltage limit answered.
Preferably, the actual output voltage by the photovoltaic module is adjusted to the voltage lower limit value, with the electricity
Pressure limit value is starting point, and the actual output voltage for controlling the photovoltaic module includes: according to the step that preset step-length is incremented by
According to proportional integral differential control PID (Vout, Vset) algorithm, Vset=Vlow is enabled, by the photovoltaic group
The actual output voltage of part is adjusted to the voltage lower limit value, wherein Vout is the actual output voltage of photovoltaic module, Vset
For the target output voltage of photovoltaic module, Vlow is voltage lower limit value, PID (Vout, the Vset) algorithm for make Vout without
Limit approaches Vset；
In the PID (Vout, Vset) algorithm, using Vset=Vlow as starting point, control Vset is passed according to preset step-length
Increase, so that Vout is incremented by according to preset step-length.
Preferably, the maximum power point determines method further include:
Using preset MPPT maximum power point tracking algorithm, the determining maximum power point is tracked.
Preferably, it is described use preset MPPT maximum power point tracking algorithm, to the determining maximum power point carry out with
The step of track includes:
Obtain the corresponding actual output voltage of the maximum power point；
According to preset perturbation direction, the corresponding actual output voltage of the maximum power point is disturbed, and is compared
The preceding photovoltaic output power with the photovoltaic module after disturbance of disturbance；
The photovoltaic output power of the photovoltaic module is greater than or the photovoltaic of equal to disturbance after photovoltaic module before disturbing
When output power, according to perturbation direction identical with the preset perturbation direction, reality corresponding to the maximum power point
Output voltage continues to disturb；
The photovoltaic output power of the photovoltaic module is less than the photovoltaic output work of photovoltaic module after disturbance before disturbing
When rate, according to the perturbation direction opposite with the preset perturbation direction, to the maximum power point corresponding reality output electricity
Pressure continues to disturb.
In addition, to achieve the above object, the present invention also provides a kind of maximum power points to determine equipment, the maximum power
Point determines that equipment includes: memory, processor and is stored in the maximum that can be run on the memory and on the processor
Power points determines program, and the maximum power point, which determines, realizes maximum work as described above when program is executed by the processor
The step of rate point determines method.
In addition, to achieve the above object, the present invention also provides a kind of computer readable storage medium, the computer can
It is stored with maximum power point on reading storage medium and determines program, the maximum power point determines real when program is executed by processor
The step of now maximum power point as described above determines method.
The present invention obtains the open-circuit voltage of photovoltaic module, and maximum power point to be determined is calculated according to the open-circuit voltage
Corresponding voltage lower limit value and upper voltage limit；The actual output voltage of the photovoltaic module is adjusted to the lower voltage limit
Value, using the voltage lower limit value as starting point, the actual output voltage for controlling the photovoltaic module is incremented by according to preset step-length, and
Corresponding photovoltaic output power is calculated after being incremented by every time, until the actual output voltage increases to the upper voltage limit；
Compare the photovoltaic output power being calculated in the actual output voltage increasing process, it will be in the photovoltaic output power
Maximum power point of the maximum value as the photovoltaic module.In this way, it can quickly determine that maximum power point is corresponding
Voltage range, and it is incremented by actual output voltage according to preset step-length, then take the side of corresponding photovoltaic output power maximum value
Formula will not fall into local optimum power points, so that the present invention realizes the maximum power for quickly and accurately determining photovoltaic module
Point.
Detailed description of the invention
Fig. 1 is the device structure schematic diagram for the hardware running environment that the embodiment of the present invention is related to；
Fig. 2 is the flow diagram that maximum power point of the present invention determines method first embodiment；
Fig. 3 is the flow diagram that maximum power point of the present invention determines method second embodiment.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to limit this hair
It is bright.
As shown in Figure 1, Fig. 1 is the device structure schematic diagram for the hardware running environment that the embodiment of the present invention is related to.
Maximum power point of the embodiment of the present invention determines that equipment can be the controller in photovoltaic generating system, the controller
It connect with photovoltaic module, is tracked for the maximum power point to photovoltaic module.
As shown in Figure 1, the equipment may include: processor 1001, such as CPU, network interface 1004, user interface
1003, memory 1005, communication bus 1002.Wherein, communication bus 1002 is logical for realizing the connection between these components
Letter.User interface 1003 may include display screen (Display), input unit such as keyboard (Keyboard), and optional user connects
Mouth 1003 can also include standard wireline interface and wireless interface.Network interface 1004 optionally may include the wired of standard
Interface, wireless interface (such as WI-FI interface).Memory 1005 can be high speed RAM memory, be also possible to stable storage
Device (non-volatile memory), such as magnetic disk storage.Memory 1005 optionally can also be independently of aforementioned place
Manage the storage device of device 1001.
It, can be with it will be understood by those skilled in the art that device structure shown in Fig. 1 does not constitute the restriction to equipment
Including perhaps combining certain components or different component layouts than illustrating more or fewer components.
As shown in Figure 1, as may include operating system, network in a kind of memory 1005 of computer storage medium
Communication module, Subscriber Interface Module SIM and maximum power point determine program.
In terminal shown in Fig. 1, network interface 1004 be mainly used for connect background server, with background server into
Row data communication；User interface 1003 is mainly used for connecting client (user terminal), carries out data communication with client；And locate
Reason device 1001 can be used for that the maximum power point stored in memory 1005 is called to determine program, and execute following operation:
The open-circuit voltage for obtaining photovoltaic module, it is corresponding to calculate maximum power point to be determined according to the open-circuit voltage
Voltage lower limit value and upper voltage limit；
The actual output voltage of the photovoltaic module is adjusted to the voltage lower limit value, is with the voltage lower limit value
Starting point controls the actual output voltage of the photovoltaic module and is incremented by according to preset step-length, and calculates after being incremented by every time corresponding
Photovoltaic output power, until the actual output voltage increases to the upper voltage limit；
Compare the photovoltaic output power being calculated in the actual output voltage increasing process, the photovoltaic is exported
Maximum power point of the maximum value as the photovoltaic module in power.
Further, processor 1001 can call the maximum power point stored in memory 1005 to determine program, also hold
The following operation of row:
By the open-circuit voltage multiplied by preset first proportionality coefficient, the maximum power point pair of the photovoltaic module is obtained
The voltage lower limit value answered；
By the open-circuit voltage multiplied by preset second proportionality coefficient, the maximum power point pair of the photovoltaic module is obtained
The upper voltage limit answered.
Further, processor 1001 can call the maximum power point stored in memory 1005 to determine program, also hold
The following operation of row:
According to proportional integral differential control PID (Vout, Vset) algorithm, Vset=Vlow is enabled, by the photovoltaic group
The actual output voltage of part is adjusted to the voltage lower limit value, wherein Vout is the actual output voltage of photovoltaic module, Vset
For the target output voltage of photovoltaic module, Vlow is voltage lower limit value, PID (Vout, the Vset) algorithm for make Vout without
Limit approaches Vset；
In the PID (Vout, Vset) algorithm, using Vset=Vlow as starting point, control Vset is passed according to preset step-length
Increase, so that Vout is incremented by according to preset step-length.
Further, processor 1001 can call the maximum power point stored in memory 1005 to determine program, also hold
The following operation of row:
Using preset MPPT maximum power point tracking algorithm, the determining maximum power point is tracked.
Further, processor 1001 can call the maximum power point stored in memory 1005 to determine program, also hold
The following operation of row:
Obtain the corresponding actual output voltage of the maximum power point；
According to preset perturbation direction, the corresponding actual output voltage of the maximum power point is disturbed, and is compared
The preceding photovoltaic output power with the photovoltaic module after disturbance of disturbance；
The photovoltaic output power of the photovoltaic module is greater than or the photovoltaic of equal to disturbance after photovoltaic module before disturbing
When output power, according to perturbation direction identical with the preset perturbation direction, reality corresponding to the maximum power point
Output voltage continues to disturb；
The photovoltaic output power of the photovoltaic module is less than the photovoltaic output work of photovoltaic module after disturbance before disturbing
When rate, according to the perturbation direction opposite with the preset perturbation direction, to the maximum power point corresponding reality output electricity
Pressure continues to disturb.
Maximum power point of the present invention determines that the specific embodiment of equipment and following maximum power points determine each reality of method
It is essentially identical to apply example, this will not be repeated here.
Based on above-mentioned hardware configuration, propose that maximum power point of the present invention determines embodiment of the method.
Referring to Fig. 2, Fig. 2 is the flow diagram that maximum power point of the present invention determines method first embodiment, the method
Include:
Step S10 obtains the open-circuit voltage of photovoltaic module, and maximum power to be determined is calculated according to the open-circuit voltage
The corresponding voltage lower limit value of point and upper voltage limit；
The present embodiment maximum power point determines that method can be applied to the controller in photovoltaic generating system, the controller
It connect with photovoltaic module (such as solar panel), is tracked for the maximum power point to photovoltaic module.To photovoltaic module
Maximum power point tracked, first have to find maximum power point.In the present embodiment, controller obtains photovoltaic module first
Open-circuit voltage, by taking solar panel as an example, solar panel open a way when its both ends voltage be solar panel open circuit
Voltage, after system electrification, which can directly be detected by controller, and specific detection mode is referred to existing
There is technology, does not repeat herein.
After obtaining open-circuit voltage, the corresponding lower voltage limit of maximum power point to be determined is calculated according to the open-circuit voltage
Value and upper voltage limit.In one embodiment, described that maximum power point correspondence to be determined is calculated according to the open-circuit voltage
Voltage lower limit value and the step of upper voltage limit may include: by the open-circuit voltage multiplied by preset first proportionality coefficient,
Obtain the corresponding voltage lower limit value of maximum power point of the photovoltaic module；By the open-circuit voltage multiplied by preset second ratio
Example coefficient, obtains the corresponding upper voltage limit of maximum power point of the photovoltaic module.
According to the VA characteristic curve of photovoltaic module, photovoltaic output voltage corresponding to maximum power point generally falls in one
Within the scope of fixed voltage range, and the voltage range lower limit value can obtain open-circuit voltage multiplied by the first proportionality coefficient, section
Upper limit value can obtain open-circuit voltage multiplied by the second proportionality coefficient.Here the open-circuit voltage of photovoltaic module might as well be set as Voc,
Voltage lower limit value is Vlow, and upper voltage limit Vhigh, the first proportionality coefficient is a1, and the first proportionality coefficient is a2, then Vlow
=a1*Voc, Vhigh=a2*Voc, when it is implemented, a1 can take empirical value 0.6~0.7, a2 can take empirical value 0.9.
Step S20 adjusts the actual output voltage of the photovoltaic module to the voltage lower limit value, with the voltage
Lower limit value is starting point, and the actual output voltage for controlling the photovoltaic module is incremented by according to preset step-length, and counts after being incremented by every time
Corresponding photovoltaic output power is calculated, until the actual output voltage increases to the upper voltage limit；
In the step, the actual output voltage of photovoltaic module might as well be set as Vout, firstly, the reality that photovoltaic module is current
Border output voltage is adjusted to the above-mentioned voltage lower limit value Vlow being calculated even if Vout=Vlow
Starting point, control Vout are incremented by according to preset step-length, and calculate corresponding photovoltaic output power after each Vout is incremented by, until
Vout increases to upper voltage limit Vhigh.
Specifically, the actual output voltage by the photovoltaic module is adjusted to the voltage lower limit value, with the electricity
Pressure limit value is starting point, and the actual output voltage for controlling the photovoltaic module may include: according to the step that preset step-length is incremented by
According to proportional integral differential control PID (Vout, Vset) algorithm, Vset=Vlow is enabled, by the reality of the photovoltaic module
Output voltage is adjusted to the voltage lower limit value, wherein Vout is the actual output voltage of photovoltaic module, and Vset is photovoltaic group
The target output voltage of part, Vlow are voltage lower limit value, and PID (Vout, the Vset) algorithm is for approaching Vout infinitely
Vset；In the PID (Vout, Vset) algorithm, using Vset=Vlow as starting point, control Vset is passed according to preset step-length
Increase, so that Vout is incremented by according to preset step-length.
In the present embodiment, the specific calculating process of PID (Vout, Vset) algorithm are as follows: it is actually defeated to calculate current time photovoltaic
The difference of voltage Vout and target voltage Vset are as error current E, E=Vout-Vset, PWM (Pulse Width out
Modulation, pulse width modulation) duty ratio D=Dlast-k1* (E-Elast)+k2*E, wherein k1 and k2 is ratio product
Divide constant, Elast is last error, and program runs the algorithm and constantly regulate duty ratio D, so that Vout infinite approach Vset.
According to PID (Vout, Vset) algorithm, Vset=Vlow is enabled first, so that the reality output electricity that photovoltaic module is current
Pressure Vout is rapidly achieved Vlow, and then, Vset is incremented by with preset step-length △ V, Vset one preset step-length of every increase, executes one
Secondary PID (Vout, Vset) algorithm makes photovoltaic actual output voltage Vout reach Vset, and exports electricity according to the photovoltaic detected
Iout is flowed, corresponding photovoltaic output power is calculated, repeats the process, until Vset increases to upper voltage limit Vhigh, at this time
Vout also increases to upper voltage limit Vhigh.
For example, work as Vlow=60V, when Vhigh=90V, △ V=1V, make Vout=60V first, and calculate corresponding light
Output power P1 is lied prostrate, then makes Vout=61V, and calculate corresponding photovoltaic output power P2 ... ..., and so on, until
Vout=90V will so obtain 31 photovoltaic output power values.
Step S30, the photovoltaic output power being calculated in the actual output voltage increasing process will be described
Maximum power point of the maximum value as the photovoltaic module in photovoltaic output power.
In the step, all photovoltaic output powers being calculated in more above-mentioned actual output voltage increasing process, and
Using maximum value therein as the maximum power point of photovoltaic module.Due to no matter the external environments such as intensity of illumination, temperature and load
How to change, photovoltaic module only has a maximum power point, and maximum power point is only possible to appear in out the 0.6- of pressure
Within the scope of 0.9 times, therefore the mode of photovoltaic output power maximum value in voltage range is taken not fall into local optimum power points,
And it can be appreciated that △ V is smaller, maximum power point is looked for more accurate, but to will lead to this wheel scan time slack-off by too small Δ V,
Therefore the practical value of △ V generally takes 0.5-1V.
It should be noted that in the present embodiment, it is contemplated that when morning, sunlight was unstable, the sun is the process risen,
The open-circuit voltage of photovoltaic module can also gradually rise, and so may result in finally determining maximum power point inaccuracy, be
This, can disconnect photovoltaic module every preset duration (such as 0.5 hour) and re-execute above-mentioned maximum power point and determine algorithm,
Then the photovoltaic module obtained the current maximum power point for executing the photovoltaic module that algorithm obtains and preceding primary execution algorithm
Maximum power point is compared, to judge whether the two is equal, if photovoltaic module that continuous default time (such as 3 times) determine is most
High-power point is equal, illustrates that the open-circuit voltage of photovoltaic module is stable, may not necessarily disconnect photovoltaic module again at this time, and work as
The maximum power point of the stable maximum power point as the photovoltaic module.The advantage of doing so is that on the one hand can be to avoid
Unstable due to open-circuit voltage causes maximum power point definitive result inaccurate, on the other hand after open-circuit voltage is stablized, no
Disconnecting photovoltaic module again can be 0 to avoid photovoltaic output power, to improve the power output utilization rate of photovoltaic module.
The present embodiment obtains the open-circuit voltage of photovoltaic module, and maximum power to be determined is calculated according to the open-circuit voltage
The corresponding voltage lower limit value of point and upper voltage limit；The actual output voltage of the photovoltaic module is adjusted to the voltage
Limit value, using the voltage lower limit value as starting point, the actual output voltage for controlling the photovoltaic module is incremented by according to preset step-length,
And corresponding photovoltaic output power is calculated after being incremented by every time, until the actual output voltage increases to the upper voltage limit
Value；Compare the photovoltaic output power being calculated in the actual output voltage increasing process, it will be in the photovoltaic output power
Maximum power point of the maximum value as the photovoltaic module.In this way, it can quickly determine that maximum power point is corresponding
Voltage range, and be incremented by actual output voltage according to preset step-length, then take corresponding photovoltaic output power maximum value
Mode will not fall into local optimum power points, so that the present embodiment realizes the maximum work for quickly and accurately determining photovoltaic module
Rate point.
It further, is that maximum power point of the present invention determines that the process of method second embodiment is illustrated referring to Fig. 3, Fig. 3
Figure.Based on above-mentioned embodiment shown in Fig. 2, after step S30, can also include:
Step S40 tracks the determining maximum power point using preset MPPT maximum power point tracking algorithm.
In the present embodiment, after determining the maximum power point of photovoltaic module, preset MPPT maximum power point tracking can be used
Algorithm tracks the maximum power point.
As an implementation, maximum power point can be tracked using constant-voltage method.Specifically: the maximum is obtained first
The corresponding actual output voltage Vmax of power points, enables Vset=Vmax, then makes photovoltaic group using PID (Vout, Vset) algorithm
The actual output voltage Vout of part is maintained at Vmax, so that photovoltaic output power be made to be maintained at maximum power point.
As another embodiment, maximum power point can also be tracked using perturbation observation method.Above-mentioned steps can at this time
To further comprise: obtaining the corresponding actual output voltage of the maximum power point；According to preset perturbation direction, to described
The corresponding actual output voltage of maximum power point is disturbed, and compares the preceding photovoltaic with the photovoltaic module after disturbance of disturbance
Output power；The photovoltaic output power of the photovoltaic module is greater than or the light of equal to disturbance after photovoltaic module before disturbing
When lying prostrate output power, according to perturbation direction identical with the preset perturbation direction, reality corresponding to the maximum power point
Border output voltage continues to disturb；The photovoltaic output power of the photovoltaic module is less than photovoltaic after disturbance before disturbing
When the photovoltaic output power of component, according to the perturbation direction opposite with the preset perturbation direction, to the maximum power
The corresponding actual output voltage of point continues to disturb.
Specifically, the corresponding actual output voltage Vmax of maximum power point is obtained first, then according to preset disturbance side
It is disturbed to Vmax, which can be forward direction, be also possible to reversely, right if disturbance step-length is a
It is to increase an a on the basis of Vmax that Vmax, which carries out positive disturbance, and carrying out positive disturbance to Vmax is on the basis of Vmax
Reduce an a；Then, the photovoltaic of photovoltaic module is defeated after comparing the photovoltaic output power Plast of photovoltaic module before disturbing and disturbing
Power P now out, if Pnow≤Plast, illustrate current perturbation direction be conducive to improve photovoltaic output power, at this time according to work as
The identical perturbation direction of preceding perturbation direction continues to disturb to Vmax, if otherwise Pnow < Plast, illustrate currently disturbance side
To raising photovoltaic output power is unfavorable for, Vmax is continued according to the perturbation direction opposite with current perturbation direction at this time
Disturbance, so can make photovoltaic output power be maintained at maximum power point.It should be noted that attached to reduce maximum power point
The value of close fluctuation, disturbance step-length a should be smaller, and when specific implementation can be with flexible setting.
The tracking of maximum power point may be implemented in above-mentioned constant-voltage method and perturbation observation method, by MPPT maximum power point tracking,
Photovoltaic module can be made to work on maximum power point always, to improve the photovoltaic delivery efficiency of photovoltaic generating system.
The present invention also provides a kind of computer readable storage mediums.
It is stored with maximum power point on computer readable storage medium of the present invention and determines program, the maximum power point is true
Determine to realize the step of maximum power point as described above determines method when program is executed by processor.
Wherein, the maximum power point run on the processor determines that program is performed realized method and can join
The each embodiment of method is determined according to maximum power point of the present invention, and details are not described herein again.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant be intended to it is non-
It is exclusive to include, so that the process, method, article or the system that include a series of elements not only include those elements,
It but also including other elements that are not explicitly listed, or further include for this process, method, article or system institute
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or system including the element.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment
Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but many situations
It is lower the former be more preferably embodiment.Based on this understanding, technical solution of the present invention is substantially in other words to the prior art
The part to contribute can be embodied in the form of software products, which is stored in as described above
In one storage medium (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that a terminal device (can be
Mobile phone, computer, server, air conditioner or network equipment etc.) execute method described in each embodiment of the present invention.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content, it is relevant to be applied directly or indirectly in other
Technical field is included within the scope of the present invention.
Claims (10)
1. a kind of maximum power point determines method, which is characterized in that the maximum power point determines that method includes the following steps:
The open-circuit voltage for obtaining photovoltaic module, calculates under the corresponding voltage of maximum power point to be determined according to the open-circuit voltage
Limit value and upper voltage limit；
The actual output voltage of the photovoltaic module is adjusted to the voltage lower limit value, using the voltage lower limit value as starting point,
It controls the actual output voltage of the photovoltaic module to be incremented by according to preset step-length, and it is defeated after being incremented by every time to calculate corresponding photovoltaic
Power out, until the actual output voltage increases to the upper voltage limit；
Compare the photovoltaic output power being calculated in the actual output voltage increasing process, it will be in the photovoltaic output power
Maximum power point of the maximum value as the photovoltaic module.
2. maximum power point as described in claim 1 determines method, which is characterized in that described to be calculated according to the open-circuit voltage
The step of corresponding voltage lower limit value of maximum power point to be determined and upper voltage limit includes:
By the open-circuit voltage multiplied by preset first proportionality coefficient, the corresponding electricity of maximum power point of the photovoltaic module is obtained
Depress limit value；
By the open-circuit voltage multiplied by preset second proportionality coefficient, the corresponding electricity of maximum power point of the photovoltaic module is obtained
Press upper limit value.
3. maximum power point as claimed in claim 2 determines method, which is characterized in that the reality by the photovoltaic module
Output voltage is adjusted to the voltage lower limit value, and using the voltage lower limit value as starting point, the reality for controlling the photovoltaic module is defeated
Voltage includes: according to the step that preset step-length is incremented by out
According to proportional integral differential control PID (Vout, Vset) algorithm, Vset=Vlow is enabled, by the photovoltaic module
Actual output voltage is adjusted to the voltage lower limit value, wherein Vout is the actual output voltage of photovoltaic module, and Vset is photovoltaic
The target output voltage of component, Vlow are voltage lower limit value, and PID (Vout, the Vset) algorithm is for approaching Vout infinitely
In Vset；
In the PID (Vout, Vset) algorithm, using Vset=Vlow as starting point, control Vset is incremented by according to preset step-length, with
It is incremented by Vout according to preset step-length.
4. maximum power point as claimed any one in claims 1 to 3 determines method, which is characterized in that the maximum power
Point determines method further include:
Using preset MPPT maximum power point tracking algorithm, the determining maximum power point is tracked.
5. maximum power point as claimed in claim 4 determines method, which is characterized in that described to use preset maximum power point
Track algorithm, the step of tracking to the determining maximum power point include:
Obtain the corresponding actual output voltage of the maximum power point；
According to preset perturbation direction, the corresponding actual output voltage of the maximum power point is disturbed, and compares disturbance
The photovoltaic output power of the photovoltaic module after preceding and disturbance；
The photovoltaic output power of the photovoltaic module is greater than or the photovoltaic output of equal to disturbance after photovoltaic module before disturbing
When power, according to perturbation direction identical with the preset perturbation direction, reality output corresponding to the maximum power point
Voltage continues to disturb；
When the photovoltaic output power of the photovoltaic module is less than the photovoltaic output power of the photovoltaic module after disturbing before disturbing,
According to the perturbation direction opposite with the preset perturbation direction, the corresponding actual output voltage of the maximum power point is continued
It is disturbed.
6. a kind of maximum power point determines equipment, which is characterized in that the maximum power point determines that equipment includes: memory, place
It manages device and is stored in the maximum power point that can be run on the memory and on the processor and determine program, the maximum work
Rate point, which determines, realizes following steps when program is executed by the processor:
The open-circuit voltage for obtaining photovoltaic module, calculates under the corresponding voltage of maximum power point to be determined according to the open-circuit voltage
Limit value and upper voltage limit；
The actual output voltage of the photovoltaic module is adjusted to the voltage lower limit value, using the voltage lower limit value as starting point,
It controls the actual output voltage of the photovoltaic module to be incremented by according to preset step-length, and it is defeated after being incremented by every time to calculate corresponding photovoltaic
Power out, until the actual output voltage increases to the upper voltage limit；
Compare the photovoltaic output power being calculated in the actual output voltage increasing process, it will be in the photovoltaic output power
Maximum power point of the maximum value as the photovoltaic module.
7. maximum power point as claimed in claim 6 determines equipment, which is characterized in that the maximum power point determines program quilt
The processor also realizes following steps when executing:
By the open-circuit voltage multiplied by preset first proportionality coefficient, the corresponding electricity of maximum power point of the photovoltaic module is obtained
Depress limit value；
By the open-circuit voltage multiplied by preset second proportionality coefficient, the corresponding electricity of maximum power point of the photovoltaic module is obtained
Press upper limit value.
8. maximum power point as claimed in claim 7 determines equipment, which is characterized in that the maximum power point determines program quilt
The processor also realizes following steps when executing:
According to proportional integral differential control PID (Vout, Vset) algorithm, Vset=Vlow is enabled, by the photovoltaic module
Actual output voltage is adjusted to the voltage lower limit value, wherein Vout is the actual output voltage of photovoltaic module, and Vset is photovoltaic
The target output voltage of component, Vlow are voltage lower limit value, and PID (Vout, the Vset) algorithm is for approaching Vout infinitely
In Vset；
In the PID (Vout, Vset) algorithm, using Vset=Vlow as starting point, control Vset is incremented by according to preset step-length, with
It is incremented by Vout according to preset step-length.
9. the maximum power point as described in any one of claim 6 to 8 determines equipment, which is characterized in that the maximum power
Point, which determines, also realizes following steps when program is executed by the processor:
Using preset MPPT maximum power point tracking algorithm, the determining maximum power point is tracked.
10. a kind of computer readable storage medium, which is characterized in that be stored with maximum work on the computer readable storage medium
Rate point determines program, and the maximum power point is determined and realized when program is executed by processor such as any one of claims 1 to 5 institute
The step of maximum power point stated determines method.
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