CN114967825B - Photovoltaic power generation maximum power tracking power generation control method, device, equipment and medium - Google Patents
Photovoltaic power generation maximum power tracking power generation control method, device, equipment and medium Download PDFInfo
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- 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
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- G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention belongs to the technical field of photovoltaic power generation control, and discloses a photovoltaic power generation maximum power tracking power generation deviceControl method, device, equipment and medium, wherein the method comprises the following steps: acquiring a power generation voltage U and a power generation current I of a photovoltaic cell at a moment t; calculating tracking criteria according to the collected power generation voltage U and power generation current I at the t moment; the tracking criteria are as follows:and controlling the power generation voltage of the photovoltaic cell at the time t+1 according to the tracking criterion, and regulating according to the regulating value. The invention utilizes the characteristic of tangent function, and can automatically adjust the sign of the output regulating value according to the sign of the tracking criterion; the invention can reduce the iteration step according to the approach to the target, can automatically identify the sign of the step and automatically change the iteration step, automatically reduce the step when approaching to the target value, and automatically increase the step when being far away from the target value. The method can analyze and calculate the step length of each step, and is suitable for the use rules of parallel hardware development such as FPGA and the like.
Description
Technical Field
The invention belongs to the technical field of photovoltaic power generation control, and particularly discloses a photovoltaic power generation maximum power tracking power generation control method, device, equipment and medium.
Background
Photovoltaic power generation is a technology that uses the photovoltaic effect of a semiconductor interface to directly convert light energy into electrical energy. Mainly comprises three parts of a solar panel, a controller and an inverter. The solar cells are packaged and protected after being connected in series to form a large-area solar cell module, and then the solar cell module is matched with components such as a power controller and the like to form the photovoltaic power generation device.
With the rapid development and large-scale utilization of new energy technologies, the full tracking and utilization of the maximum photovoltaic power are of great importance, the existing power tracking technology has the problem of power oscillation, and serious power oscillation can lead to disconnection of a power system and directly threaten the safety of a power grid.
Disclosure of Invention
The invention aims to provide a photovoltaic power generation maximum power tracking power generation control method, device, equipment and medium, which can rapidly track the maximum power and automatically reduce tracking step length when approaching the maximum power so as to avoid oscillation and iteration.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, the present invention provides a photovoltaic power generation maximum power tracking power generation control method, which is characterized by comprising:
acquiring a power generation voltage U and a power generation current I of a photovoltaic cell at a moment t;
calculating tracking criteria according to the collected power generation voltage U and power generation current I at the t moment; the tracking criteria are as follows:
and controlling the power generation voltage of the photovoltaic cell at the time t+1 according to the tracking criterion, and regulating according to the regulating value.
The invention is further improved in that:
wherein R is s Is a series resistance, q is a standard electron charge, I s Is the reverse saturation current of the diode, A is the ideal factor of the diode, K is the Botzman coefficient, T j Is the junction temperature of the photovoltaic module, R sh Is a parallel resistor.
The invention is further improved in that: the step of controlling the power generation voltage of the photovoltaic cell at the time t+1 to be adjusted according to the adjustment value according to the tracking criterion specifically comprises the following steps:
if it isStopping tracking, adjustment value = 0;
if it isReducing the t+1 moment adjusting value;
if it isThe time t+1 adjustment value is increased.
The invention is further improved in that:
wherein I is ph Is a photo-generated current.
The invention is further improved in that: the adjustment value is DeltaU step (t)；
The invention is further improved in that: the step of controlling the power generation voltage of the photovoltaic cell at the time t+1 to be adjusted according to the adjustment value according to the tracking criterion specifically comprises the following steps:
if it isStopping tracking, adjusting the value ΔU step (t)＝0；
If it isControl of the generation voltage of the photovoltaic cell at time t+1=u+Δu step (t)；
If it isControl of the generation voltage of the photovoltaic cell at time t+1=u+Δu step (t)。
In a second aspect, the present invention provides a photovoltaic power generation maximum power tracking power generation control device, including:
the acquisition module is used for acquiring the power generation voltage U and the power generation current I of the photovoltaic cell at the moment t;
the criterion calculation module is used for calculating a tracking criterion according to the collected power generation voltage U and power generation current I at the moment t; the tracking criteria are as follows:
and the judging control module is used for controlling the power generation voltage of the photovoltaic cell at the time t+1 to be adjusted according to the adjustment value according to the tracking criterion.
The invention is further improved in that:
wherein R is s Is a series resistance, q is a standard electron charge, I s Is the reverse saturation current of the diode, A is the ideal factor of the diode, K is the Botzman coefficient, T j Is the junction temperature of the photovoltaic module, R sh Is a parallel resistor;
the judging control module is used for controlling the power generation voltage of the photovoltaic cell at the time t+1 to be adjusted according to the adjustment value according to the tracking criterion, and specifically comprises the following steps:
if it isStopping tracking, adjusting the value ΔU step (t)＝0；
If it isControl of the generation voltage of the photovoltaic cell at time t+1=u+Δu step (t)；
If it isControl of the generation voltage of the photovoltaic cell at time t+1=u+Δu step (t)；
Wherein,
wherein I is ph Is a photo-generated current;
in a third aspect, the present invention provides an electronic device, where the electronic device includes a processor and a memory, where the processor is configured to execute a computer program stored in the memory to implement the photovoltaic power generation maximum power tracking power generation control method.
In a fourth aspect, the present invention provides a computer readable storage medium storing at least one instruction, which when executed by a processor, implements the photovoltaic power generation maximum power tracking power generation control method.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a photovoltaic power generation maximum power tracking power generation control method, a device, equipment and a medium, wherein tracking criteria are calculated according to collected power generation voltage U and power generation current I at t time; the tracking criteria are as follows:according to the tracking criterion, controlling the power generation voltage of the photovoltaic cell at the time t+1 to be adjusted according to an adjustment value; the invention utilizes the characteristic of tangent function, firstly, the sign of the output regulating value can be automatically adjusted according to the sign of the tracking criterion; according to the tracking criterion set by the invention, further judgment can be carried out, the iteration step length can be reduced according to the approach to the target, the sign of the step length can be automatically identified, the iteration step length can be automatically changed, the step length can be automatically reduced when the target value is approached, and the step length can be automatically increased when the target value is far away. The control method can analyze and calculate the step length of each step, and is suitable for the use rules of parallel hardware development such as FPGA and the like.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of a power derivative;
FIG. 2 is a photovoltaic circuit diagram;
FIG. 3 is a tangent hyperbolic function curve;
FIG. 4 is a schematic flow chart of a method for controlling photovoltaic power generation maximum power fast tracking power generation according to the present invention;
FIG. 5 is a graph comparing the effects of automatic variable step maximum power tracking control according to the present invention;
FIG. 6 is a block diagram of a photovoltaic power generation maximum power fast tracking power generation control device according to the present invention;
fig. 7 is a block diagram of an electronic device according to the present invention.
Detailed Description
The invention will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The following detailed description is exemplary and is intended to provide further details of the invention. Unless defined otherwise, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention.
P is the active power of photovoltaic power generation, U is the photovoltaic power generation voltage, and I is the photovoltaic power generation current;
P＝U·I(1)
deriving the formula (2) for (1)
The power derivative diagram is shown in fig. 1;the point of (2) is the maximum power point.
Referring to fig. 2, the mathematical model equation of the photovoltaic current is:
wherein I is ph Is a photo-generated current, equal to the short-circuit current. I s Is the reverse saturation current of the diode, q is the standard electron charge, K is the Botzman coefficient, A is the ideal factor of the diode, T j Is the junction temperature of the photovoltaic module. R is R s Is a series resistance, R sh Is a parallel resistor.
The derivation of formula (3) can be obtained:
from equation (2) and fig. 1, it can be analyzed that:
if it isPower tracking needs to be stopped (5)
If it isThe power tracking step (6) needs to be reduced
If it isThe power tracking step (7) needs to be increased
Calculation of
U ref (t+1)＝U ref (t)+ΔU step (t) (9)
Order the
Wherein,is a hyperbolic function coefficient;
the standard tangent hyperbolic curve is shown in figure 3.
It can be deduced that:
handleSubstituting formula (11) yields the following formula (12):
equation (13) can be derived from equation (12):
example 1
Referring to fig. 4, the invention provides a method for controlling photovoltaic power generation maximum power fast tracking power generation, which comprises the following steps:
s1, acquiring a power generation voltage U and a power generation current I of a photovoltaic cell at a moment t;
s2, calculating a tracking criterion according to the collected power generation voltage U and power generation current I at the moment t;
in one embodiment, the tracking criteria are:
wherein R is s Is a series resistance, q is a standard electron charge, I s Is the reverse saturation current of the diode, A is the ideal factor of the diode, K is the Botzman coefficient, T j Is the junction temperature of the photovoltaic module, R sh Is a parallel resistor;
s3, controlling the power generation voltage of the photovoltaic cell at the time t+1 to be adjusted according to the tracking criterion;
stopping tracking if tracking criterion=0; if the tracking criterion is less than 0, reducing the power tracking step length at the time t+1; if the tracking criterion is more than 0, increasing the power tracking step length at the time t+1;
in one embodiment, the method comprises the steps of:
if it isPower tracking needs to be stopped (5)
If it isThe power tracking step (6) needs to be reduced
If it isThe power tracking step (7) needs to be increased
Wherein I is ph Is a photo-generated current;
in one embodiment, the power tracking step at time t+1 is: deltaU step (t)；
The method comprises the following steps: u (U) ref (t+1)＝U ref (t)+ΔU step (t) (9)
Order the
Wherein,is a hyperbolic function coefficient; u (U) ref (t+1) is a target value of the power generation voltage of the photovoltaic cell at time t+1; u (U) ref (t) =u, which is the power generation voltage target value of the photovoltaic cell at time t; deltaU step (t) is the power generation voltage regulation value of the photovoltaic cell at the time t+1;
handleSubstituting formula (11) yields the following formula (12):
equation (13) can be derived from equation (12):
the generation voltage adjustment value DeltaU of the photovoltaic cell at time t+1 can be determined according to the formula (13) step (t)；
In a specific embodiment, if the tracking criterion is less than 0 or the tracking criterion is more than 0, controlling the generation voltage of the photovoltaic cell at the time t+1 to be regulated, wherein the regulation value is DeltaU step (t)。
According to fig. 3, it can be seen that the fast tracking power generation control method for maximum power of photovoltaic power generation provided by the invention utilizes the characteristic of tangent function, firstly, the sign of the output value can be automatically adjusted according to the sign of the input quantity, and secondly, the iteration step length can be reduced according to the approach to the target, so that the established modeling control method can automatically identify the sign of the step length and automatically change the iteration step length, automatically reduce the step length when approaching the target value, and automatically increase the step length when keeping away from the target value. The control method can analyze and calculate the step length of each step, and is suitable for the use rules of parallel hardware development such as FPGA and the like.
Referring to fig. 5, it can be seen that the closer the method of the present invention is to the maximum power value, the smaller the iteration step, which belongs to the automatic variable step maximum power tracking control effect.
Example 2
Referring to fig. 6, the present invention provides a photovoltaic power generation maximum power tracking power generation control device, which includes:
the acquisition module is used for acquiring the power generation voltage U and the power generation current I of the photovoltaic cell at the moment t;
the criterion calculation module is used for calculating a tracking criterion according to the collected power generation voltage U and power generation current I at the moment t; the tracking criteria are as follows:
and the judging control module is used for controlling the power generation voltage of the photovoltaic cell at the time t+1 to be adjusted according to the adjustment value according to the tracking criterion.
In one embodiment of the present invention, in one embodiment,
wherein R is s Is a series resistance, q is a standard electron charge, I s Is the reverse saturation current of the diode, A is the ideal factor of the diode, K is the Botzman coefficient, T j Is the junction temperature of the photovoltaic module, R sh Is a parallel resistor;
the judging control module is used for controlling the power generation voltage of the photovoltaic cell at the time t+1 to be adjusted according to the adjustment value according to the tracking criterion, and specifically comprises the following steps:
if it isStopping tracking, adjusting the value ΔU step (t)＝0；
If it isControl of the generation voltage of the photovoltaic cell at time t+1=u+Δu step (t)；
If it isControl of the generation voltage of the photovoltaic cell at time t+1=u+Δu step (t)；
Wherein,
wherein I is ph Is a photo-generated current;
example 3
Referring to fig. 7, the present invention further provides an electronic device 100 for implementing a photovoltaic power generation maximum power tracking power generation control method; the electronic device 100 comprises a memory 101, at least one processor 102, a computer program 103 stored in the memory 101 and executable on the at least one processor 102, and at least one communication bus 104.
The memory 101 may be used to store the computer program 103, and the processor 102 implements the method steps of the photovoltaic power generation maximum power tracking power generation control method described in embodiment 1 by running or executing the computer program stored in the memory 101 and calling the data stored in the memory 101. The memory 101 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data (such as audio data) created according to the use of the electronic device 100, and the like. In addition, the memory 101 may include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card), at least one disk storage device, a Flash memory device, or other non-volatile solid state storage device.
The at least one processor 102 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field-programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The processor 102 may be a microprocessor or the processor 102 may be any conventional processor or the like, the processor 102 being a control center of the electronic device 100, the various interfaces and lines being utilized to connect various portions of the overall electronic device 100.
The memory 101 in the electronic device 100 stores a plurality of instructions to implement a photovoltaic power generation maximum power tracking power generation control method, and the processor 102 is capable of executing the plurality of instructions to implement:
acquiring a power generation voltage U and a power generation current I of a photovoltaic cell at a moment t;
calculating tracking criteria according to the collected power generation voltage U and power generation current I at the t moment; the tracking criteria are as follows:
and controlling the power generation voltage of the photovoltaic cell at the time t+1 according to the tracking criterion, and regulating according to the regulating value.
Example 4
The modules/units integrated in the electronic device 100 may be stored in a computer readable storage medium if implemented in the form of software functional units and sold or used as a stand alone product. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, and a Read-Only Memory (ROM).
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (4)
1. The photovoltaic power generation maximum power tracking power generation control method is characterized by comprising the following steps of:
acquiring a power generation voltage U and a power generation current I of a photovoltaic cell at a moment t;
calculating tracking criteria according to the collected power generation voltage U and power generation current I at the t moment; the tracking criteria are as follows:
according to the tracking criterion, controlling the power generation voltage of the photovoltaic cell at the time t+1 to be adjusted according to an adjustment value;
wherein R is s Is a series resistance, q is a standard electron charge, I s Is a diode reverseTowards saturation current, A is the ideal factor of the diode, K is the Botzman coefficient, T j Is the junction temperature of the photovoltaic module, R sh Is a parallel resistor;
the step of controlling the power generation voltage of the photovoltaic cell at the time t+1 to be adjusted according to the adjustment value according to the tracking criterion specifically comprises the following steps:
if it isStopping tracking, adjustment value = 0;
if it isReducing the t+1 moment adjusting value;
if it isIncreasing the t+1 moment adjusting value;
wherein I is ph Is a photo-generated current;
the adjustment value is DeltaU step (t)；
Wherein,is a hyperbolic function coefficient;
the step of controlling the power generation voltage of the photovoltaic cell at the time t+1 to be adjusted according to the adjustment value according to the tracking criterion specifically comprises the following steps:
if it isStopping tracking, adjusting the value ΔU step (t)＝0；
If it isControl of the generation voltage of the photovoltaic cell at time t+1=u+Δu step (t)；
If it isControl of the generation voltage of the photovoltaic cell at time t+1=u+Δu step (t)。
2. The photovoltaic power generation maximum power tracking power generation control device is characterized by comprising:
the acquisition module is used for acquiring the power generation voltage U and the power generation current I of the photovoltaic cell at the moment t;
the criterion calculation module is used for calculating a tracking criterion according to the collected power generation voltage U and power generation current I at the moment t; the tracking criteria are as follows:
the judging control module is used for controlling the power generation voltage of the photovoltaic cell at the time t+1 to be adjusted according to the adjustment value according to the tracking criterion;
wherein R is s Is a series resistance, q is a standard electron charge, I s Is the reverse saturation current of the diode, A is the ideal factor of the diode, K is the Botzman coefficient, T j Is the junction temperature of the photovoltaic module, R sh Is a parallel resistor;
the judging control module is used for controlling the power generation voltage of the photovoltaic cell at the time t+1 to be adjusted according to the adjustment value according to the tracking criterion, and specifically comprises the following steps:
if it isStopping tracking, adjusting the value ΔU step (t)＝0；
If it isControl of the generation voltage of the photovoltaic cell at time t+1=u+Δu step (t)；
If it isControl of the generation voltage of the photovoltaic cell at time t+1=u+Δu step (t)；
Wherein,
wherein I is ph Is a photo-generated current;
wherein,is a hyperbolic function coefficient.
3. An electronic device comprising a processor and a memory, the processor configured to execute a computer program stored in the memory to implement the photovoltaic power generation maximum power tracking power generation control method of claim 1.
4. A computer-readable storage medium storing at least one instruction that when executed by a processor implements the photovoltaic power generation maximum power tracking power generation control method of claim 1.
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| CN112329238A (en) * | 2020-11-05 | 2021-02-05 | 黑龙江科技大学 | Modeling method for series-parallel photovoltaic array output characteristic curve under non-uniform working condition |
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| CN106292830A (en) * | 2016-09-19 | 2017-01-04 | 江苏大学 | A kind of maximum power point of photovoltaic power generation system tracking of improvement |
| CN106452355A (en) * | 2016-10-17 | 2017-02-22 | 温州大学 | Photovoltaic power generation system maximum power tracking method based on model identification |
| CN111769587A (en) * | 2019-04-01 | 2020-10-13 | 新奥数能科技有限公司 | Power grid frequency modulation control method and device with participation of photovoltaic power generation |
| CN110275564A (en) * | 2019-06-03 | 2019-09-24 | 济南大学 | Photovoltaic maximal power tracing optimal control method, system, medium and equipment |
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