CN114336732B - Photovoltaic maximum power point tracking method, device, equipment and storage medium - Google Patents
Photovoltaic maximum power point tracking method, device, equipment and storage medium Download PDFInfo
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- CN114336732B CN114336732B CN202111399030.0A CN202111399030A CN114336732B CN 114336732 B CN114336732 B CN 114336732B CN 202111399030 A CN202111399030 A CN 202111399030A CN 114336732 B CN114336732 B CN 114336732B
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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
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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
Abstract
The application provides a photovoltaic maximum power point tracking method, a device, equipment and a storage medium, wherein the method comprises the following steps: in the process of determining the maximum power point voltage of the photovoltaic power generation system, determining the maximum output power of the three output powers according to the output powers corresponding to the three input voltages of the photovoltaic power generation system, adjusting the appointed input voltage and the voltage step length when the maximum output power is the output power of the non-appointed input voltage, and processing the output powers corresponding to the three adjusted input voltages again until the output power corresponding to the appointed input voltage is the maximum output power, wherein the appointed input voltage after adjustment is used as the maximum power point voltage of the photovoltaic power generation system. Therefore, the maximum power point voltage of the photovoltaic power generation system is accurately determined.
Description
Technical Field
The present application relates to the field of photovoltaic power generation technologies, and in particular, to a method, an apparatus, a device, and a storage medium for tracking a photovoltaic maximum power point.
Background
In the process of generating power by using the photovoltaic power generation system, the control of the photovoltaic power generation system can work at the maximum power point, which is very important for improving the efficiency of the photovoltaic power generation system. Therefore, if the maximum power point of the photovoltaic power generation system is determined, the technical problem to be solved is urgent.
Disclosure of Invention
The application provides a photovoltaic maximum power point tracking method, a device, equipment and a storage medium.
In one aspect, an embodiment of the present application provides a method for tracking a photovoltaic maximum power point, including: acquiring a first output power value of a photovoltaic power generation system under a first input voltage, a second output power value under a second input voltage and a third output power value under a third input voltage, wherein the first input voltage is a specified input voltage, the second input voltage is a voltage obtained by subtracting a voltage step from the specified input voltage, and the third input voltage is a voltage obtained by adding the voltage step to the specified input voltage; determining a first maximum output power value of the first, second and third output power values; adjusting the specified input voltage and the voltage step when the first maximum output power value is the second output power value or the third output power value; determining an adjusted first input voltage based on the adjusted specified input voltage; according to the adjusted designated input voltage and the adjusted voltage step length, determining an adjusted second input voltage and an adjusted third input voltage; acquiring a fourth output power value of the photovoltaic power generation system under the adjusted first input voltage, a fifth output power value under the adjusted second input voltage and a sixth output power value under the adjusted third input voltage; determining a second maximum output power value of the fourth output power value, the fifth output power value and the sixth output power value; and under the condition that the second maximum output power value is determined to be the fourth output power, determining that the maximum power point voltage of the photovoltaic power generation system is the adjusted first input voltage.
In one embodiment of the application, the method further comprises: acquiring a target pulse width corresponding to the first maximum output power value; and adjusting the pulse width of the photovoltaic power generation system according to the target pulse width.
In one embodiment of the present application, the adjusting the specified input voltage and the voltage step in the case that the first maximum output power value is the second output power value or the third output power value includes: reducing the specified input voltage and the voltage step size in the case that the first maximum output power value is the second output power value; and increasing the specified input voltage and decreasing the voltage step when the first maximum output power is the third output power value.
In one embodiment of the application, the method further comprises: and determining the maximum power point voltage of the photovoltaic power generation system as the first input voltage under the condition that the first maximum output power is the first output power.
In one embodiment of the present application, before the obtaining the first output power value of the photovoltaic power generation system at the first input voltage, the second output power value at the second input voltage, and the third output power value at the third input voltage, the method further includes: obtaining the MPPT minimum voltage of the photovoltaic power generation system; obtaining a target voltage value obtained by adding the MPPT minimum voltage and the voltage step length; acquiring initial input voltage of the photovoltaic power generation system when the photovoltaic power generation system is started, and determining that the initial input voltage is greater than or equal to the target voltage value; and adjusting the initial input voltage of the photovoltaic power generation system to the first input voltage to determine the first output power value of the photovoltaic power generation system under the first input voltage.
In the photovoltaic maximum power point tracking method of the embodiment of the application, in the process of determining the maximum power point voltage of the photovoltaic power generation system, the maximum output power in the three output powers is determined according to the output power corresponding to each of the three input voltages of the photovoltaic power generation system, the specified input voltage and the voltage step size are adjusted under the condition that the maximum output power is the output power of the non-specified input voltage, the output power corresponding to each of the three adjusted input voltages is processed again until the output power corresponding to the specified input voltage is the maximum output power, and the adjusted specified input voltage is taken as the maximum power point voltage of the photovoltaic power generation system. Therefore, the maximum power point voltage of the photovoltaic power generation system is accurately determined, the photovoltaic power generation system is conveniently controlled based on the maximum power point voltage, the photovoltaic power generation system can output maximum output power, and the power generation efficiency of the photovoltaic power generation system is ensured.
Another embodiment of the present application provides a photovoltaic maximum power point tracking device, including: the first acquisition module is used for acquiring a first output power value of the photovoltaic power generation system under a first input voltage, a second output power value of the photovoltaic power generation system under a second input voltage and a third output power value of the photovoltaic power generation system under a third input voltage, wherein the first input voltage is a specified input voltage, the second input voltage is a voltage obtained by subtracting a voltage step from the specified input voltage, and the third input voltage is a voltage obtained by adding the voltage step to the specified input voltage; a first determining module configured to determine a first maximum output power value of the first output power value, the second output power value, and the third output power value; a first adjustment module, configured to adjust the specified input voltage and the voltage step size when the first maximum output power value is the second output power value or the third output power value; the second determining module is used for determining the adjusted first input voltage based on the adjusted specified input voltage; the third determining module is used for determining the adjusted second input voltage and the adjusted third input voltage according to the adjusted designated input voltage and the adjusted voltage step length; the second acquisition module is used for acquiring a fourth output power value of the photovoltaic power generation system under the adjusted first input voltage, a fifth output power value under the adjusted second input voltage and a sixth output power value under the adjusted third input voltage; a fourth determining module, configured to determine a second maximum output power value of the fourth output power value, the fifth output power value, and the sixth output power value; and a fifth determining module, configured to determine, when it is determined that the second maximum output power value is the fourth output power, that the maximum power point voltage of the photovoltaic power generation system is the adjusted first input voltage.
In one embodiment of the present application, further comprising: a third obtaining module, configured to obtain a target pulse width corresponding to the first maximum output power value; and the second adjusting module is used for adjusting the pulse width of the photovoltaic power generation system according to the target pulse width.
In one embodiment of the present application, the first adjusting module is specifically configured to: reducing the specified input voltage and the voltage step size in the case that the first maximum output power value is the second output power value; and increasing the specified input voltage and decreasing the voltage step when the first maximum output power is the third output power value.
In one embodiment of the application, the apparatus further comprises: and the sixth determining module is used for determining that the maximum power point voltage of the photovoltaic power generation system is the first input voltage under the condition that the first maximum output power is the first output power.
In one embodiment of the application, the apparatus further comprises: the fourth acquisition module is used for acquiring the MPPT minimum voltage of the photovoltaic power generation system; a fifth obtaining module, configured to obtain a target voltage value obtained by adding the MPPT minimum voltage to the voltage step; the sixth acquisition module is used for acquiring an initial input voltage of the photovoltaic power generation system when the photovoltaic power generation system is started and determining that the initial input voltage is greater than or equal to the target voltage value; and the third adjusting module is used for adjusting the initial input voltage of the photovoltaic power generation system to the first input voltage so as to determine the first output power value of the photovoltaic power generation system under the first input voltage.
In the photovoltaic maximum power point tracking device provided by the embodiment of the application, in the process of determining the maximum power point voltage of the photovoltaic power generation system, the maximum output power in the three output powers is determined according to the output power corresponding to each of the three input voltages of the photovoltaic power generation system, the specified input voltage and the voltage step size are adjusted under the condition that the maximum output power is the output power of the non-specified input voltage, the output power corresponding to each of the three adjusted input voltages is processed again until the output power corresponding to the specified input voltage is the maximum output power, and the adjusted specified input voltage is used as the maximum power point voltage of the photovoltaic power generation system. Therefore, the maximum power point voltage of the photovoltaic power generation system is accurately determined, the photovoltaic power generation system is conveniently controlled based on the maximum power point voltage, the photovoltaic power generation system can output maximum output power, and the power generation efficiency of the photovoltaic power generation system is ensured.
Another embodiment of the present application provides a photovoltaic maximum power point tracking device, including: a memory, a processor; the memory stores computer instructions which, when executed by the processor, implement the photovoltaic maximum power point tracking method of the embodiments of the present application.
In another aspect, the present application provides a non-transitory computer readable storage medium storing computer instructions for causing a computer to execute the photovoltaic maximum power point tracking method disclosed in the embodiments of the present application.
Another embodiment of the present application proposes a computer program product that when executed by an instruction processor in the computer program product implements the photovoltaic maximum power point tracking method of the embodiments of the present application.
Other effects of the above alternative will be described below in connection with specific embodiments.
Drawings
The drawings are included to provide a better understanding of the present application and are not to be construed as limiting the application. Wherein:
fig. 1 is a flow chart of a photovoltaic maximum power point tracking method according to one embodiment of the present application.
Fig. 2 is a flow chart of a photovoltaic maximum power point tracking method according to another embodiment of the present application.
Fig. 3 is a schematic structural view of a photovoltaic maximum power point tracking device according to an embodiment of the present application.
Fig. 4 is a schematic structural view of a photovoltaic maximum power point tracking device according to another embodiment of the present application.
Fig. 5 is a block diagram of a photovoltaic maximum power point tracking device according to one embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
The method and the device for tracking the photovoltaic maximum power point and the photovoltaic maximum power point tracking equipment are described below with reference to the accompanying drawings.
Fig. 1 is a flow chart of a photovoltaic maximum power point tracking method according to one embodiment of the present application. It should be noted that, the execution body of the photovoltaic maximum power point tracking method provided by the embodiment is a photovoltaic maximum power point tracking device, the photovoltaic maximum power point tracking device may be implemented in a software and/or hardware manner, the photovoltaic maximum power point tracking device in the embodiment may be configured in a photovoltaic maximum power point tracking apparatus, and the photovoltaic maximum power point tracking apparatus in the embodiment may be a photovoltaic maximum power point and MPPT (Maximum Power Point Tracking) controller.
As shown in fig. 1, the photovoltaic maximum power point tracking method may include:
step 101, obtaining a first output power value of the photovoltaic power generation system under a first input voltage, a second output power value under a second input voltage and a third output power value under a third input voltage.
The first input voltage is a specified input voltage, the second input voltage is a voltage obtained by subtracting a voltage step from the specified input voltage, and the third input voltage is a voltage obtained by adding the voltage step to the specified input voltage.
In some embodiments, the input voltage of the photovoltaic power generation system may be controlled to be a first input voltage, and a first output power value output by the photovoltaic power generation system at the first input voltage may be determined.
In some embodiments, the input voltage of the photovoltaic power generation system may be controlled to be a second input voltage, and a second output power of the photovoltaic power generation system output at the second input voltage may be determined.
In some embodiments, the input voltage of the photovoltaic power generation system may be controlled to be a third input voltage, and a third output power of the photovoltaic power generation system output at the third input voltage may be determined.
Step 102, determining a first maximum output power value of the first output power value, the second output power value and the third output power value.
Specifically, the first output power, the second output power, and the third output power may be compared to determine a maximum output power value of the three output powers.
Step 103, adjusting the designated input voltage and the voltage step when the first maximum output power value is the second output power value or the third output power value.
In some embodiments of the present application, in the case where the first maximum output power value is determined to be the first output power value, the first input voltage corresponding to the first output power value may be determined to be the maximum power point voltage of the photovoltaic power generation system.
Step 104, determining the adjusted first input voltage based on the adjusted specified input voltage.
In some embodiments, where the first maximum output power value is the second output power value, the specified input voltage is reduced and the voltage step is reduced.
In other embodiments, where the first maximum output power is the third output power value, the specified input voltage is increased and the voltage step is decreased.
Step 105, determining the adjusted second input voltage and the adjusted third input voltage according to the adjusted specified input voltage and the adjusted voltage step.
Step 106, obtaining a fourth output power value of the photovoltaic power generation system under the adjusted first input voltage, a fifth output power value of the photovoltaic power generation system under the adjusted second input voltage and a sixth output power value of the photovoltaic power generation system under the adjusted third input voltage.
Specifically, the input voltage of the photovoltaic power generation system can be controlled to be the adjusted first input voltage, the adjusted second input voltage and the adjusted third input voltage, so that the output power of the photovoltaic power generation system corresponding to each input voltage is obtained.
Step 107, determining a second maximum output power value of the fourth output power value, the fifth output power value and the sixth output power value.
And step 108, determining that the maximum power point voltage of the photovoltaic power generation system is the adjusted first input voltage under the condition that the second maximum output power value is determined to be the fourth output power value.
It should be understood that, when the second maximum output power value is determined to be the fifth output power value or the sixth output power value, the adjusted specified input voltage and the adjusted voltage step may be adjusted continuously until it is determined that the determined corresponding maximum output power value is the corresponding adjusted first input voltage, and the corresponding maximum power point voltage is output.
In the photovoltaic maximum power point tracking method of the embodiment of the application, in the process of determining the maximum power point voltage of the photovoltaic power generation system, the maximum output power in the three output powers is determined according to the output power corresponding to each of the three input voltages of the photovoltaic power generation system, the specified input voltage and the voltage step size are adjusted under the condition that the maximum output power is the output power of the non-specified input voltage, the output power corresponding to each of the three adjusted input voltages is processed again until the output power corresponding to the specified input voltage is the maximum output power, and the adjusted specified input voltage is taken as the maximum power point voltage of the photovoltaic power generation system. Therefore, the maximum power point voltage of the photovoltaic power generation system is accurately determined, the photovoltaic power generation system is conveniently controlled based on the maximum power point voltage, the photovoltaic power generation system can output maximum output power, and the power generation efficiency of the photovoltaic power generation system is ensured.
Based on the above embodiments, in order to reduce the influence of the atmospheric environment and the load variation on determining the maximum power point voltage of the photovoltaic power generation system, in some embodiments, the target pulse width corresponding to the first maximum output power value may also be obtained; and adjusting the pulse width of the photovoltaic power generation system according to the target pulse width.
Similarly, after the second maximum output power value is determined, the pulse width of the photovoltaic power generation system may be adjusted in combination with the pulse width corresponding to the second maximum output power value.
Based on the foregoing embodiment, in order to further accurately determine the maximum power point voltage of the photovoltaic power generation system, before obtaining the first output power value of the photovoltaic power generation system at the first input voltage, the second output power value at the second input voltage, and the third output power value at the third input voltage, the method further includes: obtaining the MPPT minimum voltage of the photovoltaic power generation system; obtaining a target voltage value obtained by adding the MPPT minimum voltage and the voltage step length; acquiring an initial input voltage of the photovoltaic power generation system when the photovoltaic power generation system is started, and determining that the initial input voltage is greater than or equal to a target voltage value; and adjusting the initial input voltage of the photovoltaic power generation system to a first input voltage to determine a first output power value of the photovoltaic power generation system under the first input voltage.
In order that the present application may be clearly understood by those skilled in the art, the method of this embodiment is described below in connection with fig. 2, and as shown in fig. 2, the method may include:
step 201, obtaining a state of a photovoltaic power generation system.
Step 202, when the state of the photovoltaic power generation system is in an idle state, delaying the photovoltaic power generation system until the state of the photovoltaic power generation system is a starting state.
In step 203, in the case that the state of the photovoltaic power generation system is in the start state, it may be determined whether the initial input voltage of the photovoltaic system is less than the target voltage value, and if so, the state of the photovoltaic power generation system is controlled to enter the maximum power point lock 1 state.
The target voltage value is a voltage value obtained by adding an initial voltage step to the MPPT minimum voltage.
That is, in the case where the state of the photovoltaic power generation system is in the start state, a target voltage value obtained by adding the initial voltage step to the MPPT minimum voltage may be determined, and it may be determined whether the initial input voltage of the photovoltaic system is less than the target voltage value.
In step 204, when the state of the photovoltaic power generation system is in the state of the maximum power point lock 0, the input voltage of the photovoltaic power generation system may be locked to the second input voltage to determine the second output power value P1 of the photovoltaic power generation system under the second input voltage, and after determining the second output power value, the state of the photovoltaic power generation system may be adjusted to the state of the maximum power point lock 1.
In step 205, when the state of the photovoltaic power generation system is in the state of the maximum power point lock 1, the input voltage of the photovoltaic power generation system may be locked to the first input voltage to determine the first output power value P0 of the photovoltaic power generation system under the first input voltage, and after determining the first output power value, the state of the photovoltaic power generation system may be adjusted to the state of the maximum power point lock 2.
In step 206, when the state of the photovoltaic power generation system is in the state of the maximum power point lock 2, the input voltage of the photovoltaic power generation system may be locked to a third input voltage to determine a third output power value P2 of the photovoltaic power generation system at the third input voltage, and after the third output power value is determined, the state of the photovoltaic power generation system may be adjusted to the state of the maximum power point comparison.
Step 207, in the case that the state of the photovoltaic power generation system is in the maximum power point comparison state, the second output power value P1, the first output power value P0 and the third output power value P2 may be compared, and when the maximum output power value is the second output power value P1, step 208 is executed, otherwise step 209 is executed.
Step 208, decreasing the designated input voltage, decreasing the initial voltage step, and controlling the state of the photovoltaic power generation system to enter the maximum power point lock 1 state.
Step 209, increasing the designated input voltage and reducing the initial voltage step when the maximum output power value is the third output power value P2, and controlling the state of the photovoltaic power generation system to enter the maximum power point lock 1 state; when the maximum output power value is not the third output power value P2, step 210 is performed.
Step 210, when the maximum output power value is the first output power value P0, the designated input voltage is adjusted, the voltage step is adjusted, and the state of the photovoltaic power generation system is controlled to enter the maximum power point lock 1 state.
The voltage step may be adjusted to continue to decrease to lock the MPPT position.
Step 211, judging whether the state of the photovoltaic power generation system is in the state of the maximum power point lock 1, and if so, executing step 212.
Step 212, determining whether the current input voltage of the photovoltaic power generation system is smaller than a target voltage value, wherein the target voltage value is a voltage value obtained by adding the initial voltage step to the minimum voltage of the MPPT, if yes, executing step 213, otherwise, executing step 214.
And step 213, turning off pulse output and adjusting the state of the photovoltaic power generation system to an idle state.
Step 214, determining whether the pulse width is the minimum pulse width, if yes, adjusting the state of the photovoltaic power generation system to the starting state, and if no, outputting the maximum power point voltage.
Corresponding to the photovoltaic maximum power point tracking method provided by the above embodiments, an embodiment of the present application further provides a photovoltaic maximum power point tracking device, and since the photovoltaic maximum power point tracking device provided by the embodiment of the present application corresponds to the photovoltaic maximum power point tracking method provided by the above embodiments, implementation of the photovoltaic maximum power point tracking method is also applicable to the photovoltaic maximum power point tracking device provided by the present embodiment, and will not be described in detail in the present embodiment.
Fig. 3 is a schematic structural view of a photovoltaic maximum power point tracking device according to an embodiment of the present application.
As shown in fig. 3, the photovoltaic maximum power point tracking apparatus 300 includes:
the first obtaining module 301 is configured to obtain a first output power value of the photovoltaic power generation system at a first input voltage, a second output power value of the photovoltaic power generation system at a second input voltage, and a third output power value of the photovoltaic power generation system at a third input voltage, where the first input voltage is a specified input voltage, the second input voltage is a voltage obtained by subtracting a voltage step from the specified input voltage, and the third input voltage is a voltage obtained by adding the voltage step to the specified input voltage.
The first determining module 302 is configured to determine a first maximum output power value of the first output power value, the second output power value, and the third output power value.
The first adjusting module 303 is configured to adjust the specified input voltage and the voltage step size when the first maximum output power value is the second output power value or the third output power value.
The second determining module 304 is configured to determine the adjusted first input voltage based on the adjusted specified input voltage.
The third determining module 305 is configured to determine the adjusted second input voltage and the adjusted third input voltage according to the adjusted specified input voltage and the adjusted voltage step.
The second obtaining module 306 is configured to obtain a fourth output power value of the photovoltaic power generation system at the adjusted first input voltage, a fifth output power value of the photovoltaic power generation system at the adjusted second input voltage, and a sixth output power value of the photovoltaic power generation system at the adjusted third input voltage.
A fourth determining module 307 is configured to determine a second maximum output power value of the fourth output power value, the fifth output power value and the sixth output power value.
And a fifth determining module 308, configured to determine, when it is determined that the second maximum output power value is the fourth output power, that the maximum power point voltage of the photovoltaic power generation system is the adjusted first input voltage.
In one embodiment of the present application, in the base row of the embodiment of the apparatus shown in fig. 3, as shown in fig. 4, the apparatus may further include:
a third obtaining module 309 is configured to obtain a target pulse width corresponding to the first maximum output power value.
The second adjusting module 310 is configured to adjust the pulse width of the photovoltaic power generation system according to the target pulse width.
In one embodiment of the present application, the first adjusting module 303 is specifically configured to: reducing the designated input voltage and reducing the voltage step under the condition that the first maximum output power value is the second output power value; in the case where the first maximum output power is the third output power value, the specified input voltage is increased and the voltage step is decreased.
In one embodiment of the present application, as shown in fig. 4, the apparatus further comprises:
the sixth determining module 311 is configured to determine, when the first maximum output power is the first output power, a maximum power point voltage of the photovoltaic power generation system as the first input voltage.
In one embodiment of the present application, as shown in fig. 4, the apparatus further comprises:
a fourth obtaining module 312 is configured to obtain an MPPT minimum voltage of the photovoltaic power generation system.
A fifth obtaining module 313, configured to obtain a target voltage value obtained by adding the MPPT minimum voltage to the voltage step.
The sixth obtaining module 314 is configured to obtain an initial input voltage of the photovoltaic power generation system at the start-up time, and determine that the initial input voltage is greater than or equal to a target voltage value.
The third adjusting module 315 is configured to adjust an initial input voltage of the photovoltaic power generation system to a first input voltage to determine a first output power value of the photovoltaic power generation system at the first input voltage.
In the photovoltaic maximum power point tracking device provided by the embodiment of the application, in the process of determining the maximum power point voltage of the photovoltaic power generation system, the maximum output power in the three output powers is determined according to the output power corresponding to each of the three input voltages of the photovoltaic power generation system, the specified input voltage and the voltage step size are adjusted under the condition that the maximum output power is the output power of the non-specified input voltage, the output power corresponding to each of the three adjusted input voltages is processed again until the output power corresponding to the specified input voltage is the maximum output power, and the adjusted specified input voltage is used as the maximum power point voltage of the photovoltaic power generation system. Therefore, the maximum power point voltage of the photovoltaic power generation system is accurately determined, the photovoltaic power generation system is conveniently controlled based on the maximum power point voltage, the photovoltaic power generation system can output maximum output power, and the power generation efficiency of the photovoltaic power generation system is ensured.
According to an embodiment of the application, the application further provides a photovoltaic maximum power point tracking device and a readable storage medium.
As shown in fig. 5, is a block diagram of a photovoltaic maximum power point tracking device according to one embodiment of the present application.
As shown in fig. 5, the photovoltaic maximum power point tracking apparatus includes:
memory 501, processor 502, and computer instructions stored on memory 501 and executable on processor 502.
The processor 502, when executing instructions, implements the photovoltaic maximum power point tracking method provided in the above embodiments.
Further, the photovoltaic maximum power point tracking device further includes:
a communication interface 503 for communication between the memory 501 and the processor 502.
Memory 501 is used to store computer instructions that may be executed on processor 502.
The memory 501 may include high-speed RAM memory and may also include non-volatile memory (non-volatile memory), such as at least one disk memory.
The processor 502 is configured to implement the photovoltaic maximum power point tracking method of the above embodiment when executing the program.
If the memory 501, the processor 502, and the communication interface 503 are implemented independently, the communication interface 503, the memory 501, and the processor 502 may be connected to each other via a bus and perform communication with each other. The bus may be an industry standard architecture (Industry Standard Architecture, abbreviated ISA) bus, an external device interconnect (Peripheral Component, abbreviated PCI) bus, or an extended industry standard architecture (Extended Industry Standard Architecture, abbreviated EISA) bus, among others. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, only one thick line is shown in fig. 5, but not only one bus or one type of bus.
Alternatively, in a specific implementation, if the memory 501, the processor 502, and the communication interface 503 are integrated on a chip, the memory 501, the processor 502, and the communication interface 503 may perform communication with each other through internal interfaces.
The processor 502 may be a central processing unit (Central Processing Unit, abbreviated as CPU) or an application specific integrated circuit (Application Specific Integrated Circuit, abbreviated as ASIC) or one or more integrated circuits configured to implement embodiments of the present application.
The application also provides a computer program product, which realizes the photovoltaic maximum power point tracking method of the embodiment of the application when the instruction processor in the computer program product executes the method.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium may even be paper or other suitable medium upon which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or part of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, and the program may be stored in a computer readable storage medium, where the program when executed includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented as software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (10)
1. A method for tracking a photovoltaic maximum power point, the method comprising:
acquiring a first output power value of a photovoltaic power generation system under a first input voltage, a second output power value under a second input voltage and a third output power value under a third input voltage, wherein the first input voltage is a specified input voltage, the second input voltage is a voltage obtained by subtracting a voltage step from the specified input voltage, and the third input voltage is a voltage obtained by adding the voltage step to the specified input voltage;
determining a first maximum output power value of the first, second and third output power values;
adjusting the specified input voltage and the voltage step when the first maximum output power value is the second output power value or the third output power value;
determining an adjusted first input voltage based on the adjusted specified input voltage;
according to the adjusted designated input voltage and the adjusted voltage step length, determining an adjusted second input voltage and an adjusted third input voltage;
acquiring a fourth output power value of the photovoltaic power generation system under the adjusted first input voltage, a fifth output power value under the adjusted second input voltage and a sixth output power value under the adjusted third input voltage;
determining a second maximum output power value of the fourth output power value, the fifth output power value and the sixth output power value;
under the condition that the second maximum output power value is determined to be the fourth output power, determining that the maximum power point voltage of the photovoltaic power generation system is the adjusted first input voltage;
the adjusting the specified input voltage and the voltage step when the first maximum output power value is the second output power value or the third output power value includes:
reducing the specified input voltage and the voltage step size in the case that the first maximum output power value is the second output power value;
and increasing the specified input voltage and decreasing the voltage step when the first maximum output power is the third output power value.
2. The method as recited in claim 1, further comprising:
acquiring a target pulse width corresponding to the first maximum output power value;
and adjusting the pulse width of the photovoltaic power generation system according to the target pulse width.
3. The method of claim 1, wherein the method further comprises:
and determining the maximum power point voltage of the photovoltaic power generation system as the first input voltage under the condition that the first maximum output power is the first output power.
4. The method of any of claims 1-3, wherein prior to the obtaining the first output power value at the first input voltage, the second output power value at the second input voltage, and the third output power value at the third input voltage for the photovoltaic power generation system, the method further comprises:
obtaining the MPPT minimum voltage of the photovoltaic power generation system;
obtaining a target voltage value obtained by adding the MPPT minimum voltage and the voltage step length;
acquiring initial input voltage of the photovoltaic power generation system when the photovoltaic power generation system is started, and determining that the initial input voltage is greater than or equal to the target voltage value;
and adjusting the initial input voltage of the photovoltaic power generation system to the first input voltage to determine the first output power value of the photovoltaic power generation system under the first input voltage.
5. A photovoltaic maximum power point tracking device, the device comprising:
the first acquisition module is used for acquiring a first output power value of the photovoltaic power generation system under a first input voltage, a second output power value of the photovoltaic power generation system under a second input voltage and a third output power value of the photovoltaic power generation system under a third input voltage, wherein the first input voltage is a specified input voltage, the second input voltage is a voltage obtained by subtracting a voltage step from the specified input voltage, and the third input voltage is a voltage obtained by adding the voltage step to the specified input voltage;
a first determining module configured to determine a first maximum output power value of the first output power value, the second output power value, and the third output power value;
a first adjustment module, configured to adjust the specified input voltage and the voltage step size when the first maximum output power value is the second output power value or the third output power value;
the second determining module is used for determining the adjusted first input voltage based on the adjusted specified input voltage;
the third determining module is used for determining the adjusted second input voltage and the adjusted third input voltage according to the adjusted designated input voltage and the adjusted voltage step length;
the second acquisition module is used for acquiring a fourth output power value of the photovoltaic power generation system under the adjusted first input voltage, a fifth output power value under the adjusted second input voltage and a sixth output power value under the adjusted third input voltage;
a fourth determining module, configured to determine a second maximum output power value of the fourth output power value, the fifth output power value, and the sixth output power value;
a fifth determining module, configured to determine, when it is determined that the second maximum output power value is the fourth output power, that a maximum power point voltage of the photovoltaic power generation system is the adjusted first input voltage;
the first adjusting module is specifically configured to:
reducing the specified input voltage and the voltage step size in the case that the first maximum output power value is the second output power value;
and increasing the specified input voltage and decreasing the voltage step when the first maximum output power is the third output power value.
6. The apparatus as recited in claim 5, further comprising:
a third obtaining module, configured to obtain a target pulse width corresponding to the first maximum output power value;
and the second adjusting module is used for adjusting the pulse width of the photovoltaic power generation system according to the target pulse width.
7. The apparatus of claim 5, wherein the apparatus further comprises:
and the sixth determining module is used for determining that the maximum power point voltage of the photovoltaic power generation system is the first input voltage under the condition that the first maximum output power is the first output power.
8. The apparatus of any one of claims 5-7, wherein the apparatus further comprises:
the fourth acquisition module is used for acquiring the MPPT minimum voltage of the photovoltaic power generation system;
a fifth obtaining module, configured to obtain a target voltage value obtained by adding the MPPT minimum voltage to the voltage step;
the sixth acquisition module is used for acquiring an initial input voltage of the photovoltaic power generation system when the photovoltaic power generation system is started and determining that the initial input voltage is greater than or equal to the target voltage value;
and the third adjusting module is used for adjusting the initial input voltage of the photovoltaic power generation system to the first input voltage so as to determine the first output power value of the photovoltaic power generation system under the first input voltage.
9. A photovoltaic maximum power point tracking device, comprising:
memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the photovoltaic maximum power point tracking method according to any of claims 1-4 when executing the program.
10. A computer readable storage medium having stored thereon a computer program, which when executed by a processor implements the photovoltaic maximum power point tracking method according to any of claims 1-4.
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