CN112039068A - Photovoltaic water lifting system - Google Patents
Photovoltaic water lifting system Download PDFInfo
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- CN112039068A CN112039068A CN202010919530.1A CN202010919530A CN112039068A CN 112039068 A CN112039068 A CN 112039068A CN 202010919530 A CN202010919530 A CN 202010919530A CN 112039068 A CN112039068 A CN 112039068A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 171
- 238000012806 monitoring device Methods 0.000 claims abstract description 17
- 238000012544 monitoring process Methods 0.000 claims abstract description 12
- 238000005086 pumping Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000003973 irrigation Methods 0.000 description 5
- 230000002262 irrigation Effects 0.000 description 5
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- 239000003651 drinking water Substances 0.000 description 1
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Classifications
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G25/00—Watering gardens, fields, sports grounds or the like
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
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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
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/50—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads
- H02J2310/56—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads characterised by the condition upon which the selective controlling is based
- H02J2310/62—The condition being non-electrical, e.g. temperature
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/12—Technologies relating to agriculture, livestock or agroalimentary industries using renewable energies, e.g. solar water pumping
Abstract
A photovoltaic water lifting system comprises a booster circuit, an inverter circuit, a control circuit, a grid-connected and off-grid switching circuit and a booster circuit monitoring device. The booster circuit comprises a photovoltaic module connecting end and is connected with the output end of the photovoltaic module. The booster circuit is used for boosting direct current input by the photovoltaic assembly and outputting the direct current to the inverter circuit. And the inverter circuit is used for converting the direct current converted by the booster circuit into alternating current and outputting the alternating current to the grid-connected and off-grid switching circuit. And the off-grid switching circuit comprises a power grid connecting end, a water lifting system connecting end and an inverter circuit connecting end and is used for being respectively connected with a water pump power supply input end of the water lifting system, the power grid and the inverter circuit. The booster circuit monitoring device is used for monitoring the output voltage value and the power value of the photovoltaic module. The grid connection and disconnection switching circuit controls the grid connection and disconnection of the power grid and the water lifting system according to the output voltage value and the power value of the photovoltaic module, and the power grid and the photovoltaic module supply power together when the photovoltaic module cannot meet the power supply requirement of the water lifting system.
Description
Technical Field
The invention relates to the technical field of solar equipment, in particular to a photovoltaic water lifting system.
Background
Solar energy is solar heat radiation energy, which is mainly expressed by solar rays, and since the birth of life on the earth, people live by the heat radiation energy provided by the sun, people have long utilized the solar energy, and people can use the sunlight to drill wood to get fire or dry objects in the ancient times, and under the condition that fossil fuels are gradually reduced, people pay more and more attention to the utilization of the solar energy, but at present, the solar energy is more utilized in power generation or provides energy for a water heater. Photovoltaic technology relying on solar energy is a renewable energy technology with a higher value in terms of technology, economy, resource conditions and the like. Photovoltaic water lift is an important way of solar energy utilization. Has wide application prospect in the fields of agricultural production irrigation, human and animal drinking water, ecological construction and the like. The development of the photovoltaic water lifting technology is accelerated, a new way for further developing modern irrigation is provided, and the method is an important technical measure for promoting the development of remote areas from traditional water conservancy to modern water conservancy. At present, solar water lifting irrigation is utilized, so that the solar water lifting irrigation system has important social benefits in the aspects of ecology, environmental protection, energy conservation, disaster resistance and the like, and also has considerable economic benefits. However, the angle of the sun can be changed continuously, and sunlight can only be directly irradiated on the solar panel within a short time, so that the solar panel has low absorption efficiency on solar energy, and the electric energy requirement of pumping irrigation cannot be met frequently in cloudy days.
Disclosure of Invention
The photovoltaic water lifting system mainly solves the technical problem of the prior art that the photovoltaic water lifting system is insufficient, and the benefit maximization of the photovoltaic water lifting system is realized.
According to a first aspect, an embodiment provides a photovoltaic water lifting system, which comprises a booster circuit, an inverter circuit, a control circuit, a grid-connected and off-grid switching circuit and a booster circuit monitoring device;
the booster circuit is connected with the inverter circuit and comprises a photovoltaic module connecting end; the photovoltaic module connecting end is used for being connected with the output end of the photovoltaic module; the boosting circuit is used for boosting and converting the direct current input by the photovoltaic module and outputting the boosted and converted direct current to the inverter circuit;
the inverter circuit is connected with the grid-connected and off-grid switching circuit and used for converting the direct current subjected to the boost conversion of the boost circuit into alternating current and outputting the alternating current to the grid-connected and off-grid switching circuit;
the grid-connected and off-grid switching circuit comprises a power grid connecting end, a water lifting system connecting end and an inverter circuit connecting end; the inverter circuit connecting end is connected with the inverter circuit, the water lifting system connecting end is used for being connected with a water pump power supply input end of a water lifting system, and the power grid connecting end is used for being connected with a power grid; the water lifting system is used for lifting water of a water source to a lifting area through the water pump;
the booster circuit monitoring device is connected with the control circuit and used for monitoring the electric signal output by the photovoltaic module; the electric signal output by the photovoltaic module comprises a voltage value and/or a power value;
and the control circuit is connected with the grid-connected and off-grid switching circuit and is used for controlling the grid connection and off-grid of the power grid and the water lifting system through the grid-connected and off-grid switching circuit according to the electric signals output by the photovoltaic module.
In one embodiment, the water lifting system monitoring device is connected with the control circuit and used for monitoring the water level of the water source and the water level of the lifting area; the control circuit is also used for controlling the grid connection and disconnection of the power grid and the water lifting system through the grid connection and disconnection switching circuit according to the water level of the water source and the water level of the lifting area.
In one embodiment, the system further comprises a power grid monitoring device connected with the control circuit and used for monitoring an electric signal of the power grid, wherein the electric signal of the power grid comprises a voltage value and/or a frequency value; the control circuit is also used for controlling the grid connection and disconnection of the power grid and the water lifting system through the grid connection and disconnection switching circuit according to the electric signal of the power grid.
In an embodiment, the control circuit is configured to control the water lifting system to be off-grid and the power grid to be connected to the power grid through the grid-connected and off-grid switching circuit when the water level of the water source is less than a first water level preset value or the water level of the lifting area is greater than a second water level preset value and the power grid is not powered off, so that the alternating current output by the inverter circuit is used for transmitting power to the power grid.
In one embodiment, the control circuit is further connected to the inverter circuit, and is configured to control the inverter circuit by using a DSP control algorithm when the power grid is connected to the power grid.
In an embodiment, the control circuit is configured to control the grid to be disconnected through the grid-connected and off-grid switching circuit when the electrical signal output by the photovoltaic module is greater than a first preset value, the water level of the water source is greater than a third preset value, and the water level of the lifting area is less than a fourth preset value, and the alternating current output by the inverter circuit supplies power to the water pump of the water lifting system.
In one embodiment, the control circuit is further connected to the inverter circuit, and is configured to control the inverter circuit by using a V/F control algorithm when the power grid is off-grid.
In an embodiment, the control circuit is configured to control the grid connection through the grid-on/off switching circuit when the power grid is not powered off, the electrical signal output by the photovoltaic module is smaller than a second preset value, the water level of the water source is larger than a third preset value, and the water level of the lifting area is smaller than a fourth preset value, and the alternating current output by the inverter circuit and the power grid jointly supply power to the water pump of the water lifting system.
In one embodiment, the inverter circuit includes a three-phase bridge full rectification circuit including a switching device Qa1, a switching device Qb1, a switching device Qc1, a switching device Qa2, a switching device Qb3, and a switching device Qc 3; the switching device Qa1, the switching device Qb1 and the switching device Qc1 form a common cathode group, and the switching device Qa2, the switching device Qb3 and the switching device Qc3 form a common anode group.
In one embodiment, the grid-connected and off-grid switching circuit further comprises three sets of relay switch circuits and an LC filter circuit; the relay switch circuit is connected between the inverter circuit connecting end and the water lifting system connecting end, the relay switch circuit is connected between the inverter circuit connecting end and the LC filter circuit, and the relay switch circuit is connected between the LC filter circuit and the power grid connecting end.
According to the photovoltaic water lifting system of the embodiment, the photovoltaic water lifting system comprises a booster circuit, an inverter circuit, a control circuit, a grid-connected and off-grid switching circuit and a booster circuit monitoring device. The booster circuit comprises a photovoltaic module connecting end and is connected with the output end of the photovoltaic module. The booster circuit is used for boosting direct current input by the photovoltaic assembly and outputting the direct current to the inverter circuit. And the inverter circuit is used for converting the direct current converted by the booster circuit into alternating current and outputting the alternating current to the grid-connected and off-grid switching circuit. And the off-grid switching circuit comprises a power grid connecting end, a water lifting system connecting end and an inverter circuit connecting end and is used for being respectively connected with a water pump power supply input end of the water lifting system, the power grid and the inverter circuit. The booster circuit monitoring device is used for monitoring the output voltage value and the power value of the photovoltaic module. The grid connection and disconnection switching circuit controls the grid connection and disconnection of the power grid and the water lifting system according to the output voltage value and the power value of the photovoltaic module, and the power grid and the photovoltaic module supply power together when the photovoltaic module cannot meet the power supply requirement of the water lifting system. When the energy of the photovoltaic module is sufficient, the inverter circuit supplies power to the water pump, and meanwhile, the power is transmitted to the power grid side, so that the photovoltaic energy is fully utilized.
Drawings
FIG. 1 is a schematic diagram of a photovoltaic water lift system;
FIG. 2 is a schematic structural diagram of a photovoltaic water lift system in one embodiment;
fig. 3 is a circuit diagram of a grid-connected and off-grid switching circuit according to an embodiment.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
Referring to fig. 1, a schematic structural diagram of a photovoltaic water pumping system includes a photovoltaic module 1, a voltage boost circuit 2, an inverter circuit 3, and a water pumping system 4. The photovoltaic module 1 comprises a solar battery to convert solar energy into electric energy, and the booster circuit 2 is connected with the photovoltaic module 1 and used for performing boost conversion on direct current input by the photovoltaic module 1 and outputting the direct current subjected to the boost conversion to the inverter circuit 3. Inverter circuit 3 is connected with water lifting system 4 for to water lifting system 4's water pump power supply, water lifting system 4 is used for promoting the water at water source to the promotion district through the water pump.
In the embodiment of the invention, the photovoltaic water lifting system comprises a control circuit and a grid-connected and off-grid switching circuit, and the grid-connected and off-grid of the power grid and the water lifting system are controlled by the control circuit through the grid-connected and off-grid switching circuit according to the output voltage value of the photovoltaic module, so that the power grid supplies power together when the photovoltaic module cannot meet the power supply requirement of the water lifting system; when the energy of the photovoltaic module is sufficient, the photovoltaic module supplies power to the water pump through the inverter circuit or transmits power to the power grid side, and the photovoltaic energy is fully utilized.
Example one
Referring to fig. 2, a schematic structural diagram of a photovoltaic water pumping system in an embodiment includes a voltage boost circuit 10, an inverter circuit 20, a control circuit 30, a grid-connected/off-grid switching circuit 40, and a voltage boost circuit monitoring device 90. The voltage reduction circuit 10 is connected with the inverter circuit 20 and comprises a photovoltaic module connecting end, and the photovoltaic module connecting end is used for being connected with the output end of the photovoltaic module. The boost circuit 10 is configured to boost and convert a direct current input by the photovoltaic module, and output the boosted and converted direct current to the inverter circuit 20. The inverter circuit 20 is connected to the grid-connected and off-grid switching circuit 40, and is configured to convert the dc power boosted and converted by the voltage boost circuit 10 into ac power and output the ac power to the grid-connected and off-grid switching circuit 40. And off-grid switching circuit 40 includes electric wire netting link, water lift system link and inverter circuit link, and inverter circuit link is connected with inverter circuit 20, and water lift system link is used for being connected with water pump power input end of water lift system 60, and the electric wire netting link is used for connecting electric wire netting 50. The water lift system 60 is used to lift water from a water source to a lift zone by a water pump. The boost circuit monitoring device 90 is connected to the control circuit 30 and is configured to monitor an electrical signal output by the photovoltaic module, where the electrical signal output by the photovoltaic module includes a voltage value and/or a power value. The control circuit 30 is connected with the grid-connected and off-grid switching circuit 40 and is used for controlling the grid connection and off-grid of the power grid 50 and the water lifting system 60 through the grid-connected and off-grid switching circuit 40 according to the electric signals output by the photovoltaic modules. In one embodiment, the photovoltaic lift system further comprises a lift system monitoring device 70 connected to the control circuit 30 for monitoring the water level of the water source and the water level of the lift zone. The control circuit 30 is also used for controlling the grid 50 and the water lifting system 70 to be connected with or disconnected from the grid through the on-grid switching circuit 40 according to the water level of the water source and the water level of the lifting area. In one embodiment, the photovoltaic water-lifting system further includes a power grid monitoring device 80 connected to the control circuit 30 for monitoring an electrical signal of the power grid 50, wherein the electrical signal of the power grid 50 includes a voltage value and/or a frequency value, and the power grid 50 is considered to be powered off when the voltage value is zero or the frequency value exceeds a limit. The control circuit 30 is also used for controlling the grid connection and disconnection of the power grid 50 and the water lifting system 60 through the grid connection and disconnection switching circuit 40 according to the electric signal of the power grid 50.
In an embodiment, the control circuit 30 is configured to control the water lifting system 60 to be off-grid and the power grid 50 to be on-grid through the on-grid and off-grid switching circuit 40 when the water level of the water source is less than the first water level preset value or the water level of the lifting area is greater than the second water level preset value and the power grid 50 is not powered off, so that the alternating current output by the inverter circuit 20 is used for transmitting power to the power grid 50. After the photovoltaic water lifting system pumps water and irrigates, the electric energy that will be acquireed by solar energy is transmitted electricity to the electric wire netting promptly to reduce the waste, improve the solar energy utilization ratio.
In one embodiment, the control circuit 30 is further connected to the inverter circuit 20, and is configured to control the inverter circuit 20 by using a DSP control algorithm when the power grid 50 is connected to the power grid. In one embodiment, the control circuit 30 is configured to control the grid 50 to be off-grid through the grid-on/off switching circuit 40 when the electrical signal output by the photovoltaic module is greater than a first preset value, the water level of the water source is greater than a third preset value, and the water level of the lifting area is less than a fourth preset value, and the ac power output by the inverter circuit 20 is used to supply power to the water pump of the water lifting system 60. In one embodiment, the control circuit is further connected to the inverter circuit 20, and is configured to control the inverter circuit 20 by using a V/F control algorithm when the power grid 50 is off-grid. In one embodiment, the control circuit 30 is configured to control the grid connection through the grid-on/off switching circuit 40 when the power grid 50 is not powered off, the electrical signal output by the photovoltaic module is smaller than a second preset value, the water level of the water source is greater than a third preset value, and the water level of the lifting area is smaller than a fourth preset value, and the ac output by the inverter circuit 20 and the power grid 50 jointly supply power to the water pump of the water lifting system 60. In one embodiment, the first preset value and the second preset value are voltage values.
Referring to fig. 3, a circuit diagram of an embodiment of the grid-connected and off-grid switching circuit is shown, wherein the inverter circuit 20 includes a three-phase bridge full-rectification circuit, and the three-phase bridge full-rectification circuit includes a switching device Qa1, a switching device Qb1, a switching device Qc1, a switching device Qa2, a switching device Qb3, and a switching device Qc 3; the switching device Qa1, the switching device Qb1 and the switching device Qc1 form a common cathode group, and the switching device Qa2, the switching device Qb3 and the switching device Qc3 form a common anode group. In one embodiment, the grid-connected and off-grid switching circuit 40 further includes a first relay switch circuit 41, a second relay switch circuit 42, a third relay switch circuit 44, and an LC filter circuit 43; wherein, the second group relay switch circuit 42 is connected between the inverter circuit connecting end and the water lifting system connecting end, the first group relay switch circuit 41 is connected between the inverter circuit connecting end and the LC filter circuit 43, and the third group relay switch circuit 44 is connected between the LC filter circuit 43 and the electric network connecting end. In one embodiment, the inverter circuit 20 outputs three-phase high-frequency pulse ac power.
In the embodiment of the application, a photovoltaic water lifting system is disclosed, which comprises a booster circuit, an inverter circuit, a control circuit, a grid-connected and off-grid switching circuit and a booster circuit monitoring device. The booster circuit comprises a photovoltaic module connecting end and is connected with the output end of the photovoltaic module. The booster circuit is used for carrying out voltage maximum power tracking on direct current input by the photovoltaic assembly and outputting the direct current to the inverter circuit. And the inverter circuit is used for converting the direct current converted by the booster circuit into alternating current and outputting the alternating current to the grid-connected and off-grid switching circuit. And the off-grid switching circuit comprises a power grid connecting end, a water lifting system connecting end and an inverter circuit connecting end and is used for being respectively connected with a water pump power supply input end of the water lifting system, the power grid and the inverter circuit. The voltage reduction circuit monitoring device is used for monitoring the output voltage value of the photovoltaic module. Because the control circuit controls the grid connection and disconnection of the power grid and the water lifting system through the grid connection and disconnection switching circuit according to the output voltage value of the photovoltaic module, the photovoltaic module and the power grid jointly supply power to the water lifting system when the power supply requirement of the water lifting system cannot be met. In one embodiment, the photovoltaic water lifting system is combined and utilizes a DSP control algorithm and a V/F control algorithm to control an inverter circuit to realize power transmission to the water lifting system or a power grid, so that the system has the functions of driving a water pump and grid-connected power generation, and simultaneously, the photovoltaic water lifting system is low in cost, small in size and light in weight due to the fact that the booster circuit and the inverter circuit are shared.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (10)
1. A photovoltaic water lifting system is characterized by comprising a booster circuit, an inverter circuit, a control circuit, a grid-connected and off-grid switching circuit and a booster circuit monitoring device;
the booster circuit is connected with the inverter circuit and comprises a photovoltaic module connecting end; the photovoltaic module connecting end is used for being connected with the output end of the photovoltaic module; the boosting circuit is used for boosting and converting the direct current input by the photovoltaic module and outputting the boosted and converted direct current to the inverter circuit;
the inverter circuit is connected with the grid-connected and off-grid switching circuit and used for converting the direct current subjected to the boost conversion of the boost circuit into alternating current and outputting the alternating current to the grid-connected and off-grid switching circuit;
the grid-connected and off-grid switching circuit comprises a power grid connecting end, a water lifting system connecting end and an inverter circuit connecting end; the inverter circuit connecting end is connected with the inverter circuit, the water lifting system connecting end is used for being connected with a water pump power supply input end of a water lifting system, and the power grid connecting end is used for being connected with a power grid; the water lifting system is used for lifting water of a water source to a lifting area through the water pump;
the booster circuit monitoring device is connected with the control circuit and used for monitoring the electric signal output by the photovoltaic module; the electric signal output by the photovoltaic module comprises a voltage value and/or a power value;
and the control circuit is connected with the grid-connected and off-grid switching circuit and is used for controlling the grid connection and off-grid of the power grid and the water lifting system through the grid-connected and off-grid switching circuit according to the electric signals output by the photovoltaic module.
2. The photovoltaic water lift system of claim 1 further comprising a water lift system monitoring device connected to said control circuit for monitoring the water level of said water source and the water level of said lift zone; the control circuit is also used for controlling the grid connection and disconnection of the power grid and the water lifting system through the grid connection and disconnection switching circuit according to the water level of the water source and the water level of the lifting area.
3. The photovoltaic water lift system of claim 2, further comprising grid monitoring means, connected to said control circuit, for monitoring electrical signals of said electrical grid, said electrical signals of said electrical grid comprising voltage values and/or frequency values; the control circuit is also used for controlling the grid connection and disconnection of the power grid and the water lifting system through the grid connection and disconnection switching circuit according to the electric signal of the power grid.
4. The photovoltaic water lifting system of claim 3, wherein the control circuit is configured to control the water lifting system to be off-grid through the grid-connected and off-grid switching circuit when the water level of the water source is less than a first water level preset value or the water level of the lifting area is greater than a second water level preset value and the power grid is not powered off, and the power grid is connected to the grid for transmitting the alternating current output by the inverter circuit to the power grid.
5. The photovoltaic water lifting system of claim 4, wherein the control circuit is further connected to the inverter circuit for controlling the inverter circuit by using a DSP control algorithm when the grid is connected.
6. The photovoltaic water lift system of claim 3, wherein the control circuit is configured to control the grid to be disconnected via the grid-connected/disconnected switching circuit when the electrical signal output by the photovoltaic module is greater than a first preset value, the water level of the water source is greater than a third preset value, and the water level of the lifting area is less than a fourth preset value, and the ac power output by the inverter circuit supplies power to a water pump of the water lift system.
7. The photovoltaic water lift system of claim 6, wherein the control circuit is further connected to the inverter circuit for controlling the inverter circuit using a V/F control algorithm when the grid is off-grid.
8. The photovoltaic water pumping system of claim 3, wherein the control circuit is configured to control the grid-connection through the grid-connection and off-grid switching circuit when the grid is not powered off, the electrical signal output by the photovoltaic module is less than a second preset value, the water level of the water source is greater than a third preset value, and the water level of the lifting area is less than a fourth preset value, and the alternating current output by the inverter circuit and the grid jointly supply power to the water pump of the water pumping system.
9. The photovoltaic water lift system of any of claims 1 to 8, wherein said inverter circuit comprises a three-phase bridge full rectifier circuit comprising switching device Qa1, switching device Qb1, switching device Qc1, switching device Qa2, switching device Qb3 and switching device Qc 3; the switching device Qa1, the switching device Qb1 and the switching device Qc1 form a common cathode group, and the switching device Qa2, the switching device Qb3 and the switching device Qc3 form a common anode group.
10. The photovoltaic water lift system of claim 9, wherein said grid-on and off switching circuit further comprises three sets of relay switching circuits and LC filter circuits; the relay switch circuit is connected between the inverter circuit connecting end and the water lifting system connecting end, the relay switch circuit is connected between the inverter circuit connecting end and the LC filter circuit, and the relay switch circuit is connected between the LC filter circuit and the power grid connecting end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010919530.1A CN112039068A (en) | 2020-09-04 | 2020-09-04 | Photovoltaic water lifting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010919530.1A CN112039068A (en) | 2020-09-04 | 2020-09-04 | Photovoltaic water lifting system |
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