CN116860066B - Maximum power point voltage judging method, electronic equipment and storage medium - Google Patents
Maximum power point voltage judging method, electronic equipment and storage medium Download PDFInfo
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- CN116860066B CN116860066B CN202311127311.XA CN202311127311A CN116860066B CN 116860066 B CN116860066 B CN 116860066B CN 202311127311 A CN202311127311 A CN 202311127311A CN 116860066 B CN116860066 B CN 116860066B
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000003990 capacitor Substances 0.000 claims abstract description 24
- 238000005070 sampling Methods 0.000 claims abstract description 5
- 238000004590 computer program Methods 0.000 claims description 10
- 238000004422 calculation algorithm Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000002068 genetic effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
- G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention provides a method for judging maximum power point voltage, electronic equipment and a storage medium, which are applied to MPPT controller technologyThe field comprises the following steps: setting the target voltage of MPPT as a constant value, controlling the change of the PV voltage to the target voltage of MPPT, and calculating the instantaneous power P of the equivalent capacitor C in the MPPT circuit in the process of changing the PV voltage, whereinThe period is 1/F; and determining the maximum value of the instantaneous power P of the equivalent capacitor C after the PV voltage reaches the limit value of the photovoltaic panel, wherein the voltage value U corresponding to the maximum value of the instantaneous power P of the equivalent capacitor C is the target voltage of the maximum power point in the MPPT circuit. The judging method can reduce current sampling equipment, effectively reduce manufacturing cost, has clear algorithm and easy realization of software, can reduce the burden on a control chip, and improves the accuracy of tracking the maximum power point.
Description
Technical Field
The invention belongs to the technical field of MPPT controllers, and particularly relates to a method for judging maximum power point voltage, electronic equipment and a storage medium.
Background
The MPPT controller is a solar controller with maximum power point tracking, and is an upgrading product of a traditional solar charge-discharge controller. The MPPT controller can detect the power generation voltage of the solar panel in real time and track the highest voltage current Value (VI) so that the system charges the storage battery with the maximum power output. The method is applied to a solar photovoltaic system, coordinates the work of a solar cell panel, a storage battery and a load, and is a brain of the photovoltaic system. The maximum power point tracking system is an electric system which enables a solar panel to output more electric energy by adjusting the working state of an electric module, and can effectively store direct current generated by the solar panel in a storage battery.
At present, MPPT has various control algorithms, including classical algorithm derived algorithms designed for other field problems, such as ant colony algorithm, genetic algorithm, etc., and classical MPPT algorithms such as fixed voltage method, fixed current method, disturbance observation method, etc.
The above methods all have corresponding disadvantages, such as: the fixed voltage method needs to set coefficients according to the types of the photovoltaic panels to determine the maximum power point, and the method is quite backward, can not automatically identify the maximum power point and needs to be set manually; the disturbance observation method needs to judge forward or backward disturbance according to the power, but the disturbance step length can oscillate in a small range near the maximum power point; the genetic algorithm needs software to calculate a large number of iterations, requires great calculation force, and influences the real-time performance of control for the chip of the inverter. In addition, the method needs to judge the maximum power point according to the real-time power, namely, needs to sample the voltage and the current on each path of MPPT, and has high scheme cost.
Disclosure of Invention
In view of the above problems in the prior art, the present invention aims to provide a method for determining a maximum power point voltage, which is capable of collecting a PV voltage value on each path of MPPT circuit without current sampling.
A judging method of maximum power point voltage comprises the following steps:
setting the target voltage of MPPT as a constant value, controlling the change of the PV voltage to the target voltage of MPPT, and calculating the instantaneous power P of the equivalent capacitor C in the MPPT circuit in the process of changing the PV voltage, whereinThe period is 1/F;
and determining the maximum value of the instantaneous power P of the equivalent capacitor C after the PV voltage reaches the limit value of the photovoltaic panel, wherein the voltage value U corresponding to the maximum value of the instantaneous power P of the equivalent capacitor C is the target voltage of the maximum power point in the MPPT circuit.
Preferably, the specific process of setting the target voltage of the MPPT to be a constant value and controlling the change of the PV voltage to the target voltage of the MPPT includes the following steps:
setting the target voltage of MPPT as the minimum voltage, and controlling the change of the PV voltage to the target voltage;
and judging whether the PV voltage is changed to the minimum voltage, if not, continuing to change, and if so, setting the target voltage of MPPT to be the maximum voltage, and controlling the PV voltage to change to the target voltage at the moment.
Preferably, the minimum voltage is slightly higher than the starting voltage of the PV.
Preferably, the maximum voltage is the maximum withstand voltage of the bus capacitor in the circuit.
A second object of the present invention is to provide an electronic device including: a memory and at least one processor, the memory having a computer program stored therein; the at least one processor invokes the computer program in the memory to cause the electronic device to perform the determination method described above.
A third object of the present invention is to provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-mentioned judgment method.
The beneficial effects of the invention are as follows: according to the judging method of the maximum power point voltage, according to the circuit relation of MPPT, the instantaneous power P of the equivalent capacitor C in the MPPT circuit in the process of changing the PV voltage is calculated, and the power of the equivalent capacitor C is in direct proportion to the power of the MPPT circuit, namely, the voltage when the instantaneous power P of the equivalent capacitor C reaches the maximum value is the target voltage of the maximum power point in the MPPT circuit, so that current sampling equipment is not required to be carried out, and the manufacturing cost is effectively reduced; in addition, the algorithm of the method is clear, the software is easy to realize, the burden on a control chip can be reduced, and the accuracy of tracking the maximum power point is improved.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a flow chart of a judgment method of the present invention;
fig. 2 is a schematic diagram of the MPPT circuit of the present invention.
Detailed Description
Example 1
As shown in fig. 1, a method for determining a maximum power point voltage collects PV voltage values on each path of MPPT circuit without current sampling, and specifically includes the following steps:
s1, setting a target voltage of MPPT as a minimum voltage, wherein the value of the minimum voltage is slightly higher than the starting voltage of the PV, and controlling the change of the PV voltage to the target voltage so that the PV voltage is changed to the minimum voltage first, thereby facilitating the follow-up tracking of a maximum power point;
s2, judging whether the PV voltage is changed to the minimum voltage, if not, continuing to change, if the PV voltage is equal to the minimum voltage, setting the target voltage of MPPT as the maximum voltage, wherein the value of the maximum voltage is the maximum bearing voltage value of a bus capacitor in the circuit, and controlling the PV voltage to change to the target voltage at the moment;
s3, calculating the instantaneous power P of the equivalent capacitor C in the MPPT circuit in the process of changing the PV voltage, whereinThe period is 1/F; in one embodiment, the frequency F may be selected to be 10KHz.
As shown in fig. 2, all the capacitors in the MPPT circuit are equivalent to an equivalent capacitor C, and the voltage in the circuit is continuously changed during the MPPT control process, so that the current value of the equivalent capacitor C isWhere period t=1/10 KHz and since the size of the equivalent capacitance C is fixed in the circuit, the instantaneous power P of the equivalent capacitance C is equal to +.>Proportional relation by determining ∈>The maximum value of the instantaneous power P of the equivalent capacitor C can be determined, and the voltage when the instantaneous power P of the equivalent capacitor C reaches the maximum value is the target voltage of the maximum power point in the MPPT circuit because the power increase of the MPPT circuit and the power increase on the capacitor are in a direct proportion relation.
S4, judging whether the PV voltage reaches the limit value of the photovoltaic panel, if so, entering S5, otherwise, continuing to carry out S3;
s5, determining the maximum value of the instantaneous power P of the equivalent capacitor C after the PV voltage reaches the limit value of the photovoltaic panel, wherein the voltage value U corresponding to the maximum value of the instantaneous power P of the equivalent capacitor C is the target voltage of the maximum power point.
Example two
In a second aspect of the present invention, there is provided an electronic apparatus comprising: a memory and at least one processor, the memory having a computer program stored therein; the at least one processor invokes the computer program in the memory to cause the electronic device to perform the determination method described above.
Example III
In a third aspect of the present invention, there is provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described determination method.
The foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The method for judging the maximum power point voltage is characterized by collecting the PV voltage value on each path of MPPT circuit without current sampling, and comprises the following steps:
setting the target voltage of MPPT as a constant value, controlling the change of the PV voltage to the target voltage of MPPT, and calculating the instantaneous power P of the equivalent capacitor C in the MPPT circuit in the process of changing the PV voltage, whereinThe period is 1/F;
when the PV voltage reaches the limit value of the photovoltaic panel, determining the maximum value of the instantaneous power P of the equivalent capacitor C, wherein the voltage value U corresponding to the maximum value of the instantaneous power P of the equivalent capacitor C is the target voltage of the maximum power point in the MPPT circuit;
the specific process of setting the target voltage of the MPPT to be a constant value and controlling the change of the PV voltage to the target voltage of the MPPT comprises the following steps:
setting the target voltage of MPPT as the minimum voltage, and controlling the change of the PV voltage to the target voltage;
and judging whether the PV voltage is changed to the minimum voltage, if not, continuing to change, and if so, setting the target voltage of MPPT to be the maximum voltage, and controlling the PV voltage to change to the target voltage at the moment.
2. The method of claim 1, wherein the minimum voltage is slightly higher than the starting voltage of the PV.
3. The method of claim 1, wherein the maximum voltage is a maximum withstand voltage of a bus capacitor in the circuit.
4. An electronic device, the electronic device comprising: a memory and at least one processor, the memory having a computer program stored therein; the at least one processor invokes the computer program in the memory to cause the electronic device to perform the determination method of any one of claims 1 to 3.
5. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the judgment method according to any one of claims 1 to 3.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114709807A (en) * | 2022-03-14 | 2022-07-05 | 国网辽宁省电力有限公司电力科学研究院 | Direct-current micro-grid flexible virtual inertia control method based on energy storage converter |
| CN114844027A (en) * | 2022-05-17 | 2022-08-02 | 兰州交通大学 | Photovoltaic system direct-current bus voltage control method based on finite control set model prediction |
| CN115642644A (en) * | 2022-10-31 | 2023-01-24 | 博阳能源科技有限公司 | MPPT control method |
| CN115951754A (en) * | 2022-12-26 | 2023-04-11 | 固德威电源科技(广德)有限公司 | MPPT calculation method and device and computer equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114709807A (en) * | 2022-03-14 | 2022-07-05 | 国网辽宁省电力有限公司电力科学研究院 | Direct-current micro-grid flexible virtual inertia control method based on energy storage converter |
| CN114844027A (en) * | 2022-05-17 | 2022-08-02 | 兰州交通大学 | Photovoltaic system direct-current bus voltage control method based on finite control set model prediction |
| CN115642644A (en) * | 2022-10-31 | 2023-01-24 | 博阳能源科技有限公司 | MPPT control method |
| CN115951754A (en) * | 2022-12-26 | 2023-04-11 | 固德威电源科技(广德)有限公司 | MPPT calculation method and device and computer equipment |
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