CN116667779A - Photovoltaic power supply system, photovoltaic air conditioner and control method of photovoltaic air conditioner - Google Patents
Photovoltaic power supply system, photovoltaic air conditioner and control method of photovoltaic air conditioner Download PDFInfo
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- CN116667779A CN116667779A CN202210146604.1A CN202210146604A CN116667779A CN 116667779 A CN116667779 A CN 116667779A CN 202210146604 A CN202210146604 A CN 202210146604A CN 116667779 A CN116667779 A CN 116667779A
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000005540 biological transmission Effects 0.000 claims abstract description 167
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 238000010248 power generation Methods 0.000 claims abstract description 16
- 230000001105 regulatory effect Effects 0.000 claims abstract description 15
- 238000004378 air conditioning Methods 0.000 claims description 26
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000005611 electricity Effects 0.000 description 8
- 238000005286 illumination Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000009966 trimming Methods 0.000 description 4
- 239000000306 component Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/36—Electrical components characterised by special electrical interconnection means between two or more PV modules, e.g. electrical module-to-module connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The application discloses a photovoltaic power supply system, a photovoltaic air conditioner and a control method thereof, relates to the technical field of photovoltaic air conditioners, and aims to improve the stability of output power of the photovoltaic power supply system, prolong the power supply time of the photovoltaic power supply system and reduce the operation cost of the photovoltaic air conditioner. The photovoltaic power supply system comprises a photovoltaic panel power generation array, a detection output circuit and a controller. The photovoltaic panel power generation array comprises a deployment circuit, a first direct current transmission bus and a plurality of photovoltaic panels. The dispatching circuit is used for connecting at least part of the photovoltaic plates in series, and electrically connecting the photovoltaic plates after being connected in series with a first direct current transmission bus, wherein the first direct current transmission bus is used for supplying power to the power utilization terminal. The detection output circuit is used for detecting output power parameters of the first direct-current transmission bus. The controller is used for receiving the output power parameter, and adjusting the number of the photovoltaic panels connected in series through the regulating circuit according to the output power parameter and the preset power parameter. The application is used for manufacturing the photovoltaic air conditioner.
Description
Technical Field
The application relates to the technical field of photovoltaic air conditioners, in particular to a photovoltaic power supply system, a photovoltaic air conditioner and a control method thereof.
Background
Photovoltaic panels are also known as photovoltaic power panels or solar cell power panels, and the like. The photovoltaic panel mainly utilizes the photovoltaic effect of a solar cell to directly convert solar radiation energy into electric energy. Solar energy is a clean energy source, and thus has been greatly developed. The electric energy output by the photovoltaic panel is direct current, can be converted into alternating current synchronous with a power grid through an inverter, and is then connected into a building power intranet; alternatively, the direct current driven appliance is directly powered.
In the related art, an electricity terminal (which may be a single electric device such as a central air conditioner, or a relatively independent electricity network such as an internal power grid of a building) is generally connected to a photovoltaic power supply system and a commercial power network; wherein, photovoltaic power supply system can include the photovoltaic board of polylith series arrangement. When the output power of the photovoltaic power supply system is larger (for example, the output power is larger than or equal to the rated power of the power utilization terminal), the photovoltaic power supply system is used for supplying power, and when the output power of the photovoltaic power supply system is smaller (for example, the output power is smaller than the rated power of the power utilization terminal), the power supply system is switched to the mains supply.
However, the output power of the photovoltaic panel changes with the change of the ambient temperature and the illumination intensity, and the photovoltaic panel has the characteristic of nonlinearity. For example, when the illumination in noon is strong and the temperature is high, the output power of the photovoltaic panel is high, whereas when the illumination in the morning or in the evening is weak and the temperature is low, the output power of the photovoltaic panel is low. Therefore, when the output power of the traditional photovoltaic power supply system is low, the traditional photovoltaic power supply system is directly switched to the mains supply for supplying power, and when the output power (such as output voltage) of the photovoltaic power supply system is high, the power utilization terminal can be damaged; the photovoltaic power supply system can only supply power to the power utilization terminal in a certain period of time, the power supply time is short, and the utilization rate of electric energy generated by the photovoltaic panel is low.
Disclosure of Invention
The embodiment of the invention provides a photovoltaic power supply system, a photovoltaic air conditioner and a control method thereof, which are used for improving the stability of the output power of the photovoltaic power supply system, prolonging the power supply time of the photovoltaic power supply system and reducing the operation cost of the photovoltaic air conditioner.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical scheme:
in one aspect, a photovoltaic power supply system is provided, comprising:
the photovoltaic panel power generation array comprises a first direct current transmission bus, a regulating circuit and a plurality of photovoltaic panels; the allocation circuit is used for connecting at least part of the photovoltaic plates in series and electrically connecting the photovoltaic plates after being connected in series with the first direct-current transmission bus;
the detection output circuit is electrically connected with the first direct-current transmission bus and is used for detecting the output power parameter of the first direct-current transmission bus;
the plurality of photovoltaic panels includes a plurality of first photovoltaic panels and at least one second photovoltaic panel; the plurality of first photovoltaic plates are arranged in series, and the first photovoltaic plates are electrically connected with the second photovoltaic plates through the allocation circuit; the allocation circuit is used for adjusting the number of second photovoltaic panels connected in series with the first photovoltaic panel;
In some embodiments, the output power parameter comprises an output current value iq of the first dc power transmission bus and or an output voltage value vq of the first dc power transmission bus.
In another aspect, embodiments of the present invention provide a photovoltaic power system. The photovoltaic power supply system comprises a photovoltaic panel power generation array, a detection output circuit and a controller. The photovoltaic panel power generation array comprises a deployment circuit, a first direct current transmission bus and a plurality of photovoltaic panels. The dispatching circuit is used for connecting at least part of the photovoltaic plates in series, and electrically connecting the photovoltaic plates after being connected in series with a first direct current transmission bus, wherein the first direct current transmission bus is used for supplying power to the power utilization terminal. The detection output circuit is electrically connected with the first direct-current transmission bus and is used for detecting the output power parameter of the first direct-current transmission bus. The controller is electrically connected with the allocation circuit and the output detection circuit. The controller is used for receiving the output power parameter, and adjusting the number of the photovoltaic panels connected in series through the regulating circuit according to the output power parameter and the preset power parameter.
According to the photovoltaic power supply system provided by the embodiment of the invention, the output power parameter of the first direct current transmission bus can be detected through the detection output circuit, the number of the photovoltaic plates connected in series is controlled through the allocation circuit according to the output power parameter and the preset power parameter, the photovoltaic plates connected in series are electrically connected with the first direct current transmission bus, then the power is supplied to the power utilization terminal through the first direct current transmission bus, the output power parameter on the first direct current transmission bus is further controlled, and the output power parameter is kept in a required range. For example, when the illumination is strong and the temperature is high, the output power of the single photovoltaic panel is high, and at this time, the output power of the first direct current transmission bus can be controlled by reducing the number of photovoltaic panels connected in series, and the output power of the first direct current transmission bus is in a required range. On the contrary, when the illumination is weaker and the temperature is lower, the output power of the single photovoltaic panel is lower, and at the moment, the output power of the first direct current transmission bus can be controlled by increasing the number of the photovoltaic panels connected in series, and the output power of the first direct current transmission bus is in a required range. The output power of the first direct-current transmission bus is equal to the product of the number of photovoltaic plates connected in series and the output power of a single photovoltaic plate.
In some embodiments, the preset power parameter includes a rated voltage V dc . The output power parameter comprises an output voltage value V of the first direct current transmission bus Collecting And the number M of photovoltaic panels currently in series. Wherein the number of photovoltaic panels to be connected in series is N, n= (mxv) dc /V Collecting ) And rounded up.
In some embodiments, the preset power parameter includes a rated voltage V dc . Maximum output voltage of each photovoltaic panel is V pv . The plurality of photovoltaic panels includes a plurality of first photovoltaic panels and at least one second photovoltaic panel; the plurality of first photovoltaic boards are arranged in series, and the first photovoltaic boards are electrically connected with the second photovoltaic boards through the regulating circuit. The number of first photovoltaic panels is Z, z=v dc/ V pv And rounded up. The adjusting circuit is used for adjusting the number of the second photovoltaic plates connected with the first photovoltaic plates in series.
In some embodiments, the number of second photovoltaic panels is a plurality. The deployment circuit includes a first selection circuit and a second selection circuit. The first selection circuit is arranged between the first photovoltaic plates and one second photovoltaic plate and is electrically connected with the first direct-current transmission bus. The first selection circuit is used for connecting the first photovoltaic plates with the second photovoltaic plates in series or electrically connecting the first photovoltaic plates with the first direct current transmission bus. The second selection circuit is arranged between the two second photovoltaic plates and is electrically connected with the second direct-current transmission bus. The second selection circuit is used for connecting two second photovoltaic plates in series or electrically connecting the second photovoltaic plates connected in series with the first photovoltaic plate with the first direct current transmission bus.
In some embodiments, the trimming circuit includes a third selection circuit. The third selection circuit is arranged between the two photovoltaic plates and is electrically connected with the first direct-current transmission bus. The third selection circuit is used for connecting the two photovoltaic panels in series.
In another aspect, a photovoltaic air conditioner is provided. The photovoltaic air conditioner comprises an air conditioning unit and the photovoltaic power supply system in any embodiment. The air conditioning unit comprises a second direct current transmission bus, and the second direct current transmission bus is electrically connected with the first direct current transmission bus.
According to the photovoltaic air conditioner provided by the embodiment of the invention, due to the adoption of the photovoltaic power supply system in the embodiment, the photovoltaic air conditioner system can output stable electric energy to the air conditioner unit for a long time, so that the operation time of the air conditioner unit under the condition of power supply of the photovoltaic power supply system is prolonged, the time of the air conditioner unit adopting a commercial power network for power supply is reduced, and the operation cost of the photovoltaic air conditioner is further reduced.
In some embodiments, the air conditioning unit further includes a rectifier, an inverter, a dc load assembly, and an ac load assembly. The rectifier is electrically connected with the commercial power network and the second direct current transmission bus and is used for rectifying alternating current provided by the commercial power network into direct current and transmitting the direct current to the second direct current transmission bus. The inverter is electrically connected with the second direct current transmission bus and is used for converting direct current provided by the second direct current transmission bus into alternating current. The direct current load assembly is electrically connected with the second direct current transmission bus. The ac load assembly is electrically connected to the inverter.
In still another aspect, an embodiment of the present invention further provides a control method of the photovoltaic air conditioner. The control method comprises the following steps: obtaining output power parameters of a first direct current transmission bus of a photovoltaic panel power generation array; judging whether the output power parameter meets a preset condition or not; if yes, keeping the number of the photovoltaic panels connected in series at present unchanged; and if not, regulating the number of the photovoltaic plates connected in series through the regulating circuit, and electrically connecting the photovoltaic plates connected in series with the first direct-current transmission bus.
According to the control method of the photovoltaic air conditioner, when the output power parameter does not meet the preset condition, the quantity of photovoltaic panels connected in series can be adjusted through the regulating circuit, and then the output power parameter of the first direct-current power transmission bus is adjusted, so that the output power parameter meets the preset condition. Illustratively, an output power parameter of the first direct current transmission bus (such as an output voltage value V Collecting Or the output current value iadopting) is smaller than a preset value, the number of photovoltaic panels connected in series to the first direct current transmission bus is increased, and then the output power of the first direct current transmission bus is increased, so that the requirement of the power utilization terminal is met. Or if the output power parameter of the first direct current transmission bus is larger than the preset value, the number of photovoltaic panels connected in series to the first direct current transmission bus is reduced, and then the output power of the first direct current transmission bus is increased, so that the requirement of the power utilization terminal is met. Therefore, the air conditioning unit can stably work for a long time under the power supply of the photovoltaic power supply system.
In some embodiments, the output power parameter includes an output voltage value V of the first DC power transmission bus Collecting . The control method comprises the following steps: judging the output voltage value V Collecting Whether greater than or equal to a first threshold. If the output voltage value V Collecting If the voltage is greater than the first threshold value, judging the output voltage value V Collecting Whether it is less than a second threshold; if the output voltage value V Collecting The number of photovoltaic panels connected in series at present is kept unchanged when the number of photovoltaic panels connected in series is smaller than a second threshold; if the output voltage value V Collecting Not less than (greater than or equal to) the second threshold, the number of photovoltaic panels in series is adjusted by one. If the output voltage value V Collecting And not greater than (less than or equal to) the first threshold, and adjusting the number of photovoltaic panels connected in series by one. Wherein the first threshold is less than the second threshold.
In some embodiments, the rated voltage of the first direct current transmission bus is equal to the rated voltage of the air conditioning unit, andare all V dc The method comprises the steps of carrying out a first treatment on the surface of the The output power parameter includes the number M of photovoltaic panels currently in series. Wherein the first threshold is V dc The method comprises the steps of carrying out a first treatment on the surface of the And/or the second threshold value is V dc +V Collecting /M。
In some embodiments, the output power parameter comprises an output current value I of the first dc power bus Collecting . The control method comprises the following steps: judging the output current value I Collecting Whether greater than or equal to a third threshold; if the output current value I Collecting And (3) adjusting the number of the photovoltaic panels connected in series to be one and smaller than a third threshold value. If the output current value I Collecting If the output current value is larger than or equal to the third threshold value, continuously judging whether the output current value Iadopts is smaller than the fourth threshold value. If the output current value I is smaller than the fourth threshold value, the number of the photovoltaic panels connected in series at present is kept unchanged; and if the output current value I is larger than or equal to the fourth threshold value, the number of the photovoltaic panels connected in series is regulated to be reduced by one.
In some embodiments, the rated current of the first direct current transmission bus is equal to the rated current of the air conditioning unit and is I dc . Wherein the third threshold is (0.7-0.8) I dc The method comprises the steps of carrying out a first treatment on the surface of the And/or the fourth threshold is I dc 。
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are required to be used in some embodiments of the present invention will be briefly described below, and it is apparent that the drawings in the following description are only drawings of some embodiments of the present invention, and other drawings may be obtained according to these drawings to those of ordinary skill in the art. Furthermore, the drawings in the following description may be regarded as schematic representations, not as limiting the actual dimensions of the products according to embodiments of the invention.
FIG. 1 is a schematic diagram of a photovoltaic power system according to some embodiments of the present invention;
FIG. 2 is a schematic diagram of another configuration of a photovoltaic power system according to some embodiments of the present invention;
FIG. 3 is a schematic diagram of a photovoltaic power system according to some embodiments of the present invention;
FIG. 4 is a schematic diagram of a photovoltaic power system according to some embodiments of the present invention;
FIG. 5 is a schematic diagram of a photovoltaic power system according to some embodiments of the present invention;
FIG. 6 is a schematic view of a photovoltaic air conditioner according to some embodiments of the present invention;
FIG. 7 is a flow chart of a control method of a photovoltaic air conditioner according to some embodiments of the present invention;
FIG. 8 is a flow chart of another control method of the photovoltaic air conditioner according to some embodiments of the present invention;
FIG. 9 is a flow chart of yet another control method of the photovoltaic air conditioner according to some embodiments of the present invention;
fig. 10 is a flowchart of yet another control method of the photovoltaic air conditioner according to some embodiments of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Throughout the specification and claims, the term "comprising" is to be interpreted as an open, inclusive meaning, i.e. "comprising, but not limited to, unless the context requires otherwise. In the description of the present specification, the terms "one embodiment," "some embodiments," "exemplary," or "such as" and the like are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the invention. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying 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 one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
"A and/or B" includes the following three combinations: only a, only B, and combinations of a and B.
The use of "for" herein is meant to be open and inclusive, not to exclude devices suitable for or for performing additional tasks or steps.
With the development demands of carbon peak and carbon neutralization, more energy-saving and environment-friendly clean energy is attracting more and more attention. Among them, solar energy is an important clean energy source, and photovoltaic panels using solar energy for power generation and photovoltaic power supply systems based on the photovoltaic panels are rapidly developed. The power transmission stability of the photovoltaic power supply system is improved, and the increase of the electric energy utilization rate of the photovoltaic power supply system becomes an important research direction at present.
Some embodiments of the present invention provide a photovoltaic power system 100. Referring to fig. 1, a photovoltaic power supply system 100 includes a photovoltaic panel power generation array 10, a detection output circuit 20, and a controller 30.
The photovoltaic panel power generation array 10 includes a deployment circuit 11, a first direct current power bus 12, and a plurality of photovoltaic panels 13. The photovoltaic panel 13 is used for converting solar energy into electric energy and outputting direct current, and is one of core components of the photovoltaic power supply system 100. The number of the photovoltaic panels 13 can be flexibly set according to actual demands or site requirements, and the embodiment of the present invention is not particularly limited.
The deployment circuit 11 is configured to connect at least some photovoltaic panels 13 of the plurality of photovoltaic panels 13 in series, and electrically connect the series-connected photovoltaic panels 13 to a first dc power transmission bus 12, where the first dc power transmission bus 12 is configured to supply power to the power consumption terminal. That is, the number of photovoltaic panels 13 connected in series to the first dc power transmission bus 12 may be controlled by the trimming circuit 11 to thereby adjust the output power (such as the output voltage and the output current) on the first dc power transmission bus 12.
Illustratively, the photovoltaic panel 13 may include a positive output 131 and a negative output 132. The first dc power bus 12 may include a first dc power transmission line 121 and a second dc power transmission line 122. One of the first dc power transmission line 121 and the second dc power transmission line 122 is electrically connected to the positive output terminal 131 of the photovoltaic panel 13, and the other is electrically connected to the negative output terminal 132 of the photovoltaic panel 13.
It should be understood that the photovoltaic power generation array 10 may also include other systems or components, such as adjustment brackets for mounting the stationary photovoltaic panels 13 and adjusting the orientation of the photovoltaic panels 13 based on the time of day so that the photovoltaic panels 13 are facing the sun. The present application is not particularly limited to other structures, components, and the like of the photovoltaic power generation array 10.
The detection output circuit 20 is electrically connected to the first dc power transmission bus 12, and is configured to detect an output power parameter of the first dc power transmission bus 12. The output power parameter of the first dc power transmission bus 12 may include, for example, an output voltage value V of the first dc power transmission bus 12 Collecting And/or the output current value I of the first dc power bus 12 Collecting 。
For example, the output power parameter includes an output voltage value V of the first DC power transmission bus 12 Collecting . At this time, referring to fig. 2, the detection output circuit 20 may include a voltage detection output sub-circuit 21. The voltage detection output sub-circuit 21 is electrically connected to the first and second DC power transmission sub-lines 121 and 122 for detecting a voltage difference between the first and second DC power transmission sub-lines 121 and 122 and further detecting an output voltage value V of the first DC power transmission bus 12 Collecting 。
For example, the output power parameter includes an output current value I of the first DC power transmission bus 12 Collecting . At this time, referring to fig. 3, the detection output circuit 20 may include a current detection output sub-circuit 22. The current detection output sub-circuit 22 is electrically connected with one of the first DC power transmission sub-line 121 and the second DC power transmission sub-line 122, and is used for detecting the current in the first DC power transmission sub-line 121 or the second DC power transmission sub-line 122, and further detecting the output current value I of the first DC power transmission bus 12 Collecting 。
Such as, for example, transfusionThe output power parameter includes an output voltage value V Collecting And output current value I Collecting . At this time, referring to fig. 4, the detection output circuit 20 may include a voltage detection output sub-circuit 21 and a current detection output sub-circuit 22. The voltage detection output sub-circuit 21 is electrically connected to the first and second DC power transmission sub-lines 121 and 122 for detecting an output voltage value V of the first DC power transmission bus 12 Collecting . The current detection output sub-circuit 22 is electrically connected with one of the first and second DC power transmission sub-lines 121 and 122 for detecting the output current value I of the first DC power transmission bus 12 Collecting 。
Referring to fig. 1, the controller 30 is electrically connected to the blending circuit 11 and the output detection circuit 20. The controller 30 is configured to receive the output power parameter (detected by the detection output circuit 20) and adjust the number of series connected photovoltaic panels 13 according to the output power parameter (received) and the preset power parameter by the adjustment circuit 11.
By way of example, the controller 30 may be a device having various functions of calculation, comparison, storage, and output. The preset power parameter may be a range value, or a plurality of thresholds; which may be pre-stored within the controller 30. The output detection circuit 20 detects the output power parameter of the first dc power transmission bus 12, and transmits the detected output power parameter to the controller 30.
According to the photovoltaic power supply system 100 provided by the embodiment of the invention, the output power parameter of the first direct current transmission bus 12 can be detected through the detection output circuit 20, the number of the photovoltaic panels 13 connected in series is controlled through the allocation circuit according to the output power parameter and the preset power parameter, the photovoltaic panels 13 connected in series are electrically connected with the first direct current transmission bus 12, then the power is supplied to the power utilization terminal through the first direct current transmission bus 12, the output power parameter (output power) on the first direct current transmission bus 12 is further controlled, and the output power parameter (output power) is kept within a required range.
Illustratively, when the light is strong and the temperature is high (for example, in noon), the output power of the single photovoltaic panel 13 is high (the output voltage and the output current are high), at this time, the output power of the first dc power transmission bus 12 can be controlled by reducing the number of photovoltaic panels 13 connected in series, and the output power of the first dc power transmission bus 12 can be controlled within a desired range. On the contrary, when the illumination is weaker and the temperature is lower (such as morning and evening), the output power of the single photovoltaic panel 13 is lower, and at this time, the output power of the first dc power transmission bus 12 can be controlled by increasing the number of photovoltaic panels 13 connected in series, and the output power of the first dc power transmission bus 12 is within the required range.
Wherein the output power of the first dc transmission bus 12 is equal to the product of the number of photovoltaic panels 13 connected in series and the output power of the individual photovoltaic panels 13. For example, each photovoltaic panel 13 has an output power P m The number of the series photovoltaic panels is M, and the output power of the first direct current transmission bus is M multiplied by P m 。
In the embodiment of the present invention, the photovoltaic panels 13 connected in series refer to the photovoltaic panels 13 connected in series and electrically connected to the first dc power transmission bus 12.
In some embodiments, the photovoltaic power system 100 may also include a battery (not shown). The deployment circuit 11 is also configured to electrically connect other photovoltaic panels 13 (hereinafter, simply referred to as "the remaining photovoltaic panels") of the plurality of photovoltaic panels 13 other than the photovoltaic panels 13 connected in series to the storage battery, and store electric energy generated by the remaining photovoltaic panels and the photovoltaic panels 13 in the storage battery. The secondary battery may be electrically connected to the first dc power bus 12 and output electrical energy through the first dc power bus 12 when the power output from the photovoltaic panel power generation array 10 is low or does not generate power. In this way, the utilization rate of the photovoltaic power generation array 10 can be improved.
In some embodiments, the preset power parameter includes a rated voltage V dc . The output power parameter includes an output voltage value V of the first dc power bus 12 Collecting I.e. the actual output voltage on the first dc power bus 12; and the number M of photovoltaic panels 13 currently in series. The number of photovoltaic panels 13 to be connected in series is N, n= (m×v) dc /V Collecting ) And takes the integer upward.
The output voltage of the individual photovoltaic panels 13 may reach tens of volts, which may be, for example,maximum output voltage of the single photovoltaic panel 13 is V pv May be 48V. Thus, each time one photovoltaic panel 13 is increased or decreased, the voltage value V is output on the first DC power transmission bus 12 Collecting The variation fluctuation is relatively large. N= (m×v) dc /V Collecting ) And round upwards to ensure the output voltage value V on the first DC transmission bus 12 Collecting Slightly greater than rated voltage value V dc In this way, in the case that the power consumption terminal is connected to the photovoltaic power supply system 100 and the utility network at the same time, it is possible to ensure that the power consumption terminal is operated by the photovoltaic power supply system 100 mainly.
It should be understood that, in general, the rated voltage value V of the first dc transmission bus 12 dc Instead of the maximum voltage value that the first dc power transmission bus 12 can withstand, the voltage value that the first dc power transmission bus 12 can withstand is greater than or much greater than the rated voltage value V of the first dc power transmission bus 12 dc 。
Illustratively, taking the photovoltaic air conditioner 200 as an example (described in detail below), the photovoltaic air conditioner 200 includes a second dc power transmission bus 41, and the second dc power transmission bus 41 is electrically connected to a utility grid (380V three power is an example) through a rectifier, and the voltage of the dc power converted by the utility grid is about 520V, that is, the rated voltage value of the second dc power transmission bus 41 is designed to be 520V. The rated voltage value of the first DC power transmission bus 12 may be equal to the rated voltage value of the second DC power transmission bus 41, and both are V dc . I.e. the rated voltage value of the first dc power bus 12 may be 520V. However, the voltage values that can be tolerated by the first and second dc power transmission buses 12 and 41 can typically reach 800V or even higher.
At rated voltage value V dc For 520V, the output voltage of the single photovoltaic panel 13 is 48V, for example, the number n=520V/48 v=10.83 of photovoltaic panels 13 to be connected in series is 11, i.e. the number N of photovoltaic panels 13 connected in series is 11. At this time, the output voltage of the first dc transmission bus 12 is 11×48v=528V.
Alternatively, when the intensity of the light is weak and the output voltage value of the single photovoltaic panel 13 does not reach the highest value (48V), for example, the output voltage value V is detected Collecting =450v, the number M of photovoltaic panels 13 currently connected in series is 10, the number n= (m×v) of photovoltaic panels 13 required to be connected in series dc /V Collecting ) And integer taken upwards= (10 x 520V/450V) integer taken upwards = 12. The number of series connected photovoltaic panels 13 is increased to 12 by the deployment circuit 11. At this time, the output voltage of the first dc transmission bus 12 is 12× (450V/10) =540V.
Output voltage value V on first dc transmission bus 12 Collecting Slightly greater than rated voltage value V dc In the above case, it is ensured that the air conditioning unit 40 is operated mainly with the power supplied by the photovoltaic power supply system 100. If the voltage value V is output on the first DC transmission bus 12 Collecting Less than V dc The air conditioning unit 40 is operated primarily on mains power. If the voltage value V is output on the first DC transmission bus 12 Collecting Equal to V dc The air conditioning unit 40 is operated with a hybrid power supply of the utility network 300 and the photovoltaic power supply system 100.
In some embodiments, the preset power parameter includes a rated voltage V dc . Referring to fig. 5, the maximum output voltage of each photovoltaic panel 13 is V pv . The plurality of photovoltaic panels 13 includes a plurality of first photovoltaic panels 131 and at least one second photovoltaic panel 132; the plurality of first photovoltaic panels 131 are arranged in series, and the first photovoltaic panels 131 are electrically connected to the second photovoltaic panels 132 through the deployment circuit 11. The number of first photovoltaic panels 131 is Z, z=v dc /V pv And rounded up. The trimming circuit 11 is used to adjust the number of second photovoltaic panels 132 connected in series with the first photovoltaic panel 131. In this way, a selection circuit (the selection circuit is described below) is not required between the plurality of first photovoltaic panels 131, which is beneficial to simplifying the deployment circuit 11 and reducing the connection difficulty of the deployment circuit 11.
Illustratively at rated voltage V dc For 520V, the output voltage of the single photovoltaic panel 13 is 48V, for example, the number of first photovoltaic panels 131 is z=v dc /V pv And rounding up=11. I.e. the plurality of photovoltaic panels 13 may comprise 11 first photovoltaic panels 131 arranged in series. In this way, in the case where the illumination is strong and the temperature is high, each photovoltaic panel 13 outputs the maximum voltage, it is possible to output electric power only through the plurality of first photovoltaic panels 131 arranged in series. Weakened in illuminationIn this case, part or all of the second photovoltaic panels 132 may be connected in series with the plurality of first photovoltaic panels 131 to satisfy the electricity demand of the electricity terminal.
In some embodiments, referring to fig. 5, the number of second photovoltaic panels 132 is a plurality. The trimming circuit includes a first selection circuit 111 and a second selection circuit 112. Of which only two second photovoltaic panels 132 are shown by way of example in fig. 5, as well as one first selection circuit 111 and one second selection circuit 112.
The first selection circuit 111 is disposed between the first photovoltaic panels 131 and the second photovoltaic panel 132, and is electrically connected to the first dc bus 12. The first selection circuit 111 is used to connect the plurality of first photovoltaic panels 131 in series with the second photovoltaic panels 132 or to electrically connect the plurality of first photovoltaic panels 131 with the first dc transmission bus 12.
For example, when the light is weak and the temperature is low, the first selection circuit 111 may connect the plurality of first photovoltaic panels 131 in series with the second photovoltaic panels 132, and the plurality of first photovoltaic panels 131 and the second photovoltaic panels 132 connected in series therewith output the electric power to the first dc transmission bus 12. When the light is strong and the temperature is high, the first selection circuit 111 electrically connects the plurality of first photovoltaic panels 131 to the first dc power transmission bus 12, and outputs electric energy to the first dc power transmission bus 12 only through the plurality of first photovoltaic panels 131.
The second selection circuit 112 is disposed between the two second photovoltaic panels 132 and is electrically connected to the second dc power transmission bus 12. The second selection circuit 112 is used to connect two second photovoltaic panels 132 in series, or to electrically connect a second photovoltaic panel 132 connected in series with a first photovoltaic panel 131 to the first dc transmission bus 12.
In the embodiment of the present application, only a single pole double throw switch is taken as an example, and the selection circuits (the first selection circuit 111, the second selection circuit 112, and the third selection circuit 113 hereinafter) are functionally and exemplarily expressed, and the present application is not limited thereto. The selection circuit may be any electrical component that can be switched by a circuit, such as a relay.
Illustratively, referring to FIG. 5, Z first photovoltaic panels 131 in series are numbered 1, 2, … …, Z-1, Z; and taking two second photovoltaic panels 132 as an example, the two second photovoltaic panels 132 are divided into numbers a and b. Wherein Z first photovoltaic panels 131 and two second photovoltaic panels 132 are connected in a schematic way.
For example, when Z photovoltaic panels 13 are required to output electric energy to the first dc power transmission bus 12, the first selection circuit 111 connects Z first photovoltaic panels 131 in series to the first dc power transmission bus 12, that is, the single pole double throw switch K2 in the figure is in contact with the contact 2. When z+1 photovoltaic panels 13 are required to output electric energy to the first dc transmission bus 12, the first selection circuit 111 connects Z first photovoltaic panels 131 and one second photovoltaic panel 132 (numbered b) in series, the single-pole double-throw switch K2 is in contact with the contact 1, and the second selection circuit 112 between the two second photovoltaic panels 132 connects the second photovoltaic panel 132 connected in series with the Z first photovoltaic panels 131 electrically to the first dc transmission bus 12, that is, the single-pole double-throw switch K2 is in contact with the contact 2.
In some embodiments, referring to fig. 2-4, the blending circuit 11 includes a third selection circuit 113. The third selection circuit 113 is disposed between the two photovoltaic panels 13 and is electrically connected to the first dc power transmission bus 12. The third selection circuit 113 is used to connect two photovoltaic panels 13 in series. Thus, a third selection circuit 113 is provided between each adjacent two of the plurality of photovoltaic panels 12. Output voltage V of first dc power transmission bus 12 Collecting The adjusting range is wider, and the method can be suitable for different power utilization terminals.
Illustratively, the number of photovoltaic panels 13 is P, numbered sequentially as 1, 2, … …, P-1 and P. A third selection circuit 113 (single pole double throw switch K) is provided between every two adjacent (numbered adjacent) photovoltaic panels 13. The deployment circuit 11 may connect any adjacent plurality of photovoltaic panels 13 in series and electrically connect to the first dc power bus 12.
Some embodiments of the present invention also provide a photovoltaic air conditioner 200. Referring to fig. 6, a photovoltaic air conditioner 200 includes an air conditioning unit 40 and the photovoltaic power system 100 of any of the embodiments described above. The air conditioning unit 40 includes a second dc power transmission bus 41, and the second dc power transmission bus 41 is electrically connected to the first dc power transmission bus 12.
In some embodiments, the air conditioning unit 40 may be a multi-split central air conditioner, and the photovoltaic power supply system 100 is configured to reduce the operation cost of the photovoltaic air conditioner 200, solve the problem that the central air conditioner is "affordable" and does not use the user pain point, prolong the power supply time of the photovoltaic power supply system 100, and smooth the power supply peak-valley (the output voltage is relatively stable) of the photovoltaic power supply system 100, so as to ensure the long-term stable operation of the photovoltaic air conditioner 200. The time length of the air conditioning unit adopting the utility power grid to supply power is reduced, and the operation cost of the photovoltaic air conditioner 200 is further reduced.
The photovoltaic power supply system 100 directly supplies power to the power utilization terminal, so that the electric energy loss of electric energy in the process of accessing to a commercial power network and in the process of transmitting the commercial power network can be effectively reduced, and the utilization rate of the photovoltaic power supply system 100 can be improved.
In some embodiments, air conditioning unit 40 further includes a rectifier 42, an inverter 43, a dc load assembly 44, and an ac load assembly 45. The rectifier 42 is electrically connected to the utility network 300 and the second dc power transmission bus 41, and is configured to rectify the ac power provided by the utility network 300 into dc power, and transmit the dc power to the second dc power transmission bus 41. The inverter 43 is electrically connected to the second dc power transmission bus 41 and the ac load assembly 45, and is configured to convert dc power provided by the second dc power transmission bus 41 into ac power, and transmit the ac power to the ac load assembly 45. The dc load assembly 44 may include a step-down to avoid damaging the dc load assembly 44 by the hvdc current on the second dc transmission bus 41.
Some embodiments of the present invention further provide a control method of the photovoltaic air conditioner 200. The control method comprises S410-S432.
S410, (controller 30) obtains the output power parameter of the first dc power bus 12 of the photovoltaic panel power generation array 10.
Wherein the output power parameter may include an output voltage value V of the first DC power transmission bus 12 Collecting And/or output current value I Collecting . For example, the detection output circuit 20 may collect output power parameters of the first dc power transmission bus 12 in real time and communicate the output power parameters to the controller 30. Alternatively, the first acquisition may be intermittent (e.g., at 1 minute, 5 minutes, or 10 minute intervals)The output power parameter of the dc power bus 12 is transmitted to the controller 30.
S420, (the controller 30) judges whether the output power parameter meets the preset condition.
The preset condition may be at least one numerical range. For example, the preset condition may be the output voltage value V Collecting Is a range of values; or, is the output current value I Collecting A range of values; or both the output voltage value V Collecting Further comprises an output current value I Collecting A range of values. The above range values may be fixed or adjustable. May be preset in the controller 30, or may be calculated according to information received by the controller. The embodiments of the present disclosure are not particularly limited thereto.
S431, if yes, keeping the number of photovoltaic panels 13 currently connected in series unchanged.
S432, if not, (controller 30) adjusts the number of series-connected photovoltaic panels 13 by the regulator circuit 11. And electrically connects the series-connected photovoltaic panel 13 with the first dc power transmission bus 12.
According to the control method of the photovoltaic air conditioner, when the output power parameter does not meet the preset condition, the quantity of the photovoltaic panels 13 connected in series can be adjusted through the regulating circuit 11, so that the output power parameter of the first direct-current power transmission bus 12 is adjusted, and the output power parameter meets the preset condition.
Illustratively, an output power parameter of the first dc power bus 12 (such as an output voltage value V Collecting Or the output current value iadopting) is smaller than a certain preset value, the number of photovoltaic panels 13 connected in series to the first direct current transmission bus 12 is increased, so that the output power of the first direct current transmission bus 12 is increased to meet the electricity consumption requirement of the electricity consumption terminal. Or when the output power parameter of the first dc transmission bus 12 is greater than a certain preset value, the number of photovoltaic panels 13 connected in series to the first dc transmission bus 12 is reduced, so that the output power of the first dc transmission bus 12 is increased to meet the electricity demand of the electricity terminal. Thus, the air conditioning unit 40 can be stabilized under the power supply of the photovoltaic power supply system 100 for a long time And (3) doing so.
In some embodiments, the output power parameter comprises an output voltage value V of the first direct current transmission bus Collecting 。
Referring to fig. 8, S420 determines whether the output power parameter satisfies a preset condition, including S421 to S422.
S421, determining the output voltage value V Collecting Whether or not it is greater than or equal to a first threshold value V 1 。
S422, if yes (output voltage V Collecting Greater than or equal to the first threshold V 1 ) Judging the output voltage value V Collecting Whether or not it is smaller than the second threshold value V 2 。
S431, if yes (output voltage V Collecting Less than a second threshold V 2 I.e. it is determined that the output power parameter satisfies the preset condition) the number of photovoltaic panels 13 currently connected in series is kept unchanged.
S4321 if no (output voltage V Collecting Not less than a second threshold value V 2 I.e. it is determined that the output power parameter satisfies the preset condition). The number of photovoltaic panels 13 in series is adjusted by one.
S4322 if no (output voltage V Collecting And is not greater than the first threshold V1, that is, it is determined that the output power parameter satisfies the preset condition), the number of series-connected photovoltaic panels 13 is adjusted by one.
Wherein the order of S421 and S422 may be interchanged. For example, to judge the output voltage value V Collecting Whether or not it is smaller than the second threshold value V 2 Then, the output voltage value V is judged Collecting Whether or not it is greater than or equal to a first threshold value V 1 . S432, if the output power parameter does not meet the preset condition, the number of the series photovoltaic panels 13 is adjusted by the adjusting circuit 11, including S4321-S4322. The first threshold V1 is smaller than the second threshold V2. That is, in the embodiment of the present disclosure, the output voltage value V of the first dc power transmission bus 12 is obtained by adjusting the number of the photovoltaic panels 13 connected in series Collecting Is maintained between the first threshold V1 and the second threshold V2.
Illustratively, the first DC power transmission bus 12 has a voltage rating equal to the voltage rating of the air conditioning unit, and is V dc The method comprises the steps of carrying out a first treatment on the surface of the Output power parameterIncluding the number M of photovoltaic panels 13 currently in series. Wherein the first threshold is V dc The method comprises the steps of carrying out a first treatment on the surface of the In this way, the output voltage V of the first DC power transmission bus 12 can be made Collecting Greater than rated voltage V dc (i.e. the first threshold is V dc ) The air conditioning unit 40 is mainly operated by the photovoltaic power supply system 100. And/or the second threshold value is V dc +V Collecting M; the output voltage V of the first DC power transmission bus 12 can be made Collecting At a lower level, avoiding the output voltage V of the first dc transmission bus 12 Collecting Too high, it is advantageous to promote the safety of the air conditioning unit 40.
In some embodiments, the output power parameter comprises an output current value I of the first dc power bus Collecting 。
Referring to fig. 9, S420 determines whether the output power parameter satisfies a preset condition, including S423 to S424.
S423, judging the output current value I Collecting Whether or not it is greater than or equal to a third threshold I 1 。
S424, if yes (output current value I Collecting Greater than or equal to a third threshold I 1 ) Judging the output current value I Collecting Whether or not it is smaller than the fourth threshold I 2 。
S431, if yes (output current value I Collecting Less than the fourth threshold I 2 ) The number of photovoltaic panels 13 currently connected in series is kept unchanged.
S4323, if not (the output current value I is larger than or equal to the fourth threshold I2), the number of the photovoltaic panels connected in series is regulated to be reduced by one.
S4324 if no (output current value I) Collecting Less than a third threshold I 1 ) The number of photovoltaic panels 13 connected in series is adjusted by one.
In some embodiments, the rated current of the first DC power transmission bus 12 is equal to the rated current of the air conditioning unit, and is I dc 。
Wherein the third threshold I 1 Is (0.7-0.8) I dc . Illustratively, a third threshold I 1 Is 0.70I dc 、0.75 I dc Or 0.80. 0.80I dc The method comprises the steps of carrying out a first treatment on the surface of the In this way, the air conditioning unit 40 can be maintainedHigher output power. And/or the fourth threshold is I dc The method comprises the steps of carrying out a first treatment on the surface of the In this way, damage to the air conditioning unit 40 by the output current of the first dc power bus 12 can be avoided. I.e. the output current value I of the first dc power transmission bus 12 Collecting Is maintained at (0.7-0.8) I dc ~ I dc Between them. Due to the output voltage V of the first DC power transmission bus 12 Collecting Slightly greater than the rated voltage value V of the first DC transmission bus 12 dc Output current value I of first dc power transmission bus 12 Collecting Slightly smaller than the rated current value I of the first DC power transmission bus 12 dc The air conditioning unit may also operate within the normal fluctuation range of the rated power. The service life of the photovoltaic air conditioner is prolonged.
It should be appreciated that, in some embodiments, referring to fig. 10, before the output power parameter of the first dc power bus 12 of the photovoltaic panel power generation array 10 is obtained in S410, the control method further includes S401 (not shown in the figure).
S401, whether the air conditioning unit 40 is in a starting state is judged.
If yes, go to step S410 to step S432.
If not, the plurality of photovoltaic panels 13 are electrically connected to the battery. To store the electrical energy generated by the plurality of photovoltaic panels 13 into a battery for use.
In the description of the present specification, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.
The present invention is not limited to the above embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A photovoltaic power supply system, comprising:
the photovoltaic panel power generation array comprises a first direct current transmission bus, a regulating circuit and a plurality of photovoltaic panels; the allocation circuit is used for connecting at least part of the photovoltaic plates in series and electrically connecting the photovoltaic plates after being connected in series with the first direct-current transmission bus;
the detection output circuit is electrically connected with the first direct-current transmission bus and is used for detecting the output power parameter of the first direct-current transmission bus;
the plurality of photovoltaic panels includes a plurality of first photovoltaic panels and at least one second photovoltaic panel; the plurality of first photovoltaic plates are arranged in series, and the first photovoltaic plates are electrically connected with the second photovoltaic plates through the allocation circuit; the allocation circuit is used for adjusting the number of second photovoltaic panels connected in series with the first photovoltaic panel;
the output power parameter comprises an output current value I of the first direct-current transmission bus Collecting And/or the output voltage value V of the first direct current transmission bus Collecting 。
2. The photovoltaic power supply system of claim 1, wherein the preset power parameter further comprises a rated voltage V dc The method comprises the steps of carrying out a first treatment on the surface of the The output power parameter also comprises the number M of photovoltaic panels currently connected in series;
Wherein the number of photovoltaic panels connected in series is N, n= (m×v) dc /V Collecting ) And rounded up.
3. The photovoltaic power supply system of claim 2, wherein the preset power parameter comprises a rated voltage V dc The method comprises the steps of carrying out a first treatment on the surface of the The maximum output voltage of each photovoltaic panel is V pv ；
Wherein the number of the first photovoltaic panels is Z, Z=V dc /V pv And rounded up.
4. A photovoltaic power supply system according to claim 2 or 3, wherein the number of second photovoltaic panels is a plurality; the deployment circuit includes:
the first selection circuit is arranged between the plurality of first photovoltaic plates and one second photovoltaic plate and is electrically connected with the first direct-current transmission bus; the first selection circuit is used for connecting a plurality of first photovoltaic plates with the second photovoltaic plates in series or electrically connecting a plurality of first photovoltaic plates with the first direct-current transmission bus;
the second selection circuit is arranged between the two second photovoltaic plates and is electrically connected with the second direct-current transmission bus; the second selection circuit is used for connecting two second photovoltaic plates in series or electrically connecting the second photovoltaic plates connected in series with the first photovoltaic plate with the first direct-current transmission bus.
5. The photovoltaic power supply system according to claim 1 or 2, wherein the deployment circuit comprises:
the third selection circuit is arranged between the two photovoltaic panels and is electrically connected with the first direct-current transmission bus; the third selection circuit is used for connecting the two photovoltaic panels in series.
6. A photovoltaic air conditioner, comprising:
the photovoltaic power supply system according to any one of claims 1 to 5.
7. The photovoltaic air conditioner of claim 6, wherein the air conditioning unit further comprises:
the rectifier is electrically connected with the commercial power network and the second direct current transmission bus and is used for rectifying alternating current provided by the commercial power network into direct current and transmitting the direct current to the second direct current transmission bus;
the inverter is electrically connected with the second direct-current transmission bus and is used for converting direct current provided by the second direct-current transmission bus into alternating current;
the direct current load assembly is electrically connected with the second direct current transmission bus;
and the alternating current load assembly is electrically connected with the inverter.
8. A control method of a photovoltaic air conditioner according to claim 6 or 7,
when the output power parameter comprises the output voltage value V of the first direct-current transmission bus Collecting ；
The control method comprises the following steps:
judging the output voltage value V Collecting Whether greater than or equal to a first threshold;
if not, the number of the photovoltaic panels connected in series is regulated to be increased by one;
if yes, judging the output voltage value V Collecting Whether it is less than a second threshold;
if not, the number of the photovoltaic panels connected in series is regulated to be reduced by one;
if yes, keeping the number of the photovoltaic panels connected in series at present unchanged;
wherein the first threshold is less than the second threshold.
9. The control method according to claim 8, wherein the rated voltage of the first dc power transmission bus is equal to the rated voltage of the air conditioning unit and is V dc The method comprises the steps of carrying out a first treatment on the surface of the The output power parameter comprises the number M of photovoltaic panels currently connected in series;
wherein the first threshold is V dc The method comprises the steps of carrying out a first treatment on the surface of the And/or the second threshold value is V dc +V Collecting /M。
10. The control method according to claim 6 or 7, characterized in that when the output power parameter includes an output current value I of the first dc transmission bus Collecting ；
The control method comprises the following steps:
judging the output current value I Collecting Whether greater than or equal to a third threshold;
if not, the number of the photovoltaic panels connected in series is regulated to be increased by one;
if yes, judging whether the output current value I is smaller than a fourth threshold value;
If not, the number of the photovoltaic panels connected in series is regulated to be reduced by one;
if yes, keeping the number of the photovoltaic panels connected in series at present unchanged;
the third threshold value is smaller than the fourth threshold value, and rated current of the first direct current transmission bus is equal to rated current of the air conditioning unit and is I dc ；
Wherein the third threshold is (0.7-0.8) I dc The method comprises the steps of carrying out a first treatment on the surface of the And/or the fourth threshold is I dc 。
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| CN202210146604.1A CN116667779A (en) | 2022-02-17 | 2022-02-17 | Photovoltaic power supply system, photovoltaic air conditioner and control method of photovoltaic air conditioner |
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