CN110932327A - Intelligent photovoltaic grid-connected and off-grid integrated energy storage inverter and control method thereof - Google Patents
Intelligent photovoltaic grid-connected and off-grid integrated energy storage inverter and control method thereof Download PDFInfo
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- CN110932327A CN110932327A CN201911306181.XA CN201911306181A CN110932327A CN 110932327 A CN110932327 A CN 110932327A CN 201911306181 A CN201911306181 A CN 201911306181A CN 110932327 A CN110932327 A CN 110932327A
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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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- 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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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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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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses an intelligent photovoltaic grid-connected and off-grid integrated energy storage inverter and a control method thereof, which relate to the technical field of photovoltaic energy storage power generation, and comprise a photovoltaic panel, a storage battery, commercial power and three working modes, and further comprise: the MPPT module, the DC/AC converter and the grid-connected/off-grid conversion module, and the three working modes are set to be a battery priority mode, a mains supply priority mode and a peak clipping and valley filling mode. The intelligent photovoltaic grid-connected and grid-disconnected integrated energy storage inverter and the control method thereof have the advantages that the selection of multiple working modes of a mains supply priority mode, a battery priority mode and a peak clipping and valley filling mode is realized, so that the functions of spontaneous self-use of photovoltaic power generation, balance on-line, peak clipping and valley filling, power grid support, a backup power supply and the like are achieved, the storage battery charging and discharging times are few, the service life is long, and photovoltaic energy cannot be wasted no matter which working mode the intelligent photovoltaic grid-connected and grid-disconnected integrated energy storage inverter works in.
Description
Technical Field
The invention relates to the technical field of photovoltaic energy storage power generation, in particular to an intelligent photovoltaic grid-connected and off-grid integrated energy storage inverter and a control method thereof.
Background
In the field of traditional solar photovoltaic power generation, three modes of independent off-grid operation, grid-connected operation and parallel off-grid energy storage operation are available.
A photovoltaic system operating independently off-grid generally consists of a solar photovoltaic module, a photovoltaic controller, an off-grid inverter, a storage battery pack, and the like. The off-grid operation system needs to be provided with a large-capacity storage battery, the system cost is high, and depreciation and loss of repeated charging and discharging of the storage battery are inevitable.
A photovoltaic system in grid-connected operation does not need a storage battery and generally comprises a solar photovoltaic module, a grid-connected inverter and a public power grid. The output of the photovoltaic system is directly connected with a public power grid and operated in a grid-connected mode, and the principle is that direct current generated by the solar photovoltaic module is converted into alternating current with the same frequency, the same phase and the same voltage amplitude as the public power grid. However, the system has the following general difficulties: solar energy can only generate electricity in the daytime and cannot generate electricity at night; the solar power generation is intermittent, and the power generation power is influenced by weather; when the power grid fails, the grid-connected inverter stops working, so that energy waste of solar energy and the power load cannot be used; for the area with grid-connected power limitation, if the power of the solar power generation is larger than that of the local load, the surplus solar energy is wasted.
The photovoltaic system operated by grid-connected and off-grid energy storage generally comprises a solar photovoltaic module, a grid-connected and off-grid inverter, a storage battery and a public power grid. The solar photovoltaic power generation system has the working mode that photovoltaic energy is preferentially provided for a load, when the photovoltaic can not meet the load requirement, a battery starts to discharge, when the photovoltaic can completely meet the load requirement, redundant electric quantity is stored in the battery, and if no battery exists or the battery is fully charged, the redundant electric quantity is merged into a power grid; when the power grid is powered off, the power grid is automatically switched to an off-grid mode to supply power to the load. However, the working mode is single, intelligence is difficult to realize, diversified requirements of users cannot be met, and functions of peak clipping, valley filling, power grid supporting and the like cannot be realized. Therefore, it is necessary to invent an intelligent photovoltaic grid-connected and grid-disconnected integrated energy storage inverter and a control method thereof to solve the above problems.
Disclosure of Invention
The invention aims to provide an intelligent photovoltaic grid-connected and off-grid integrated energy storage inverter and a control method thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an intelligent photovoltaic is and is separated integrative energy storage inverter of net, includes photovoltaic board, battery, commercial power and three kinds of mode, still includes:
the MPPT module is used for controlling the input of energy generated by the photovoltaic panel and the maximum power point tracking;
the DC/AC converter is used for converting the direct current processed by the MPPT module and the storage battery into alternating current required by a load and is connected to the grid;
the grid-connected/off-grid conversion module is used for controlling grid-connected work operation or off-grid work operation;
the three working modes are set as a battery priority mode, a mains supply priority mode and a peak clipping and valley filling mode.
Preferably, the intelligent power supply further comprises a DSP module used for signal acquisition and control of the MPPT module, the DC/AC converter and the grid-connected/off-grid conversion module, and the DSP module is electrically connected with a display/external communication module.
Preferably, the DC/AC converter is a DC/AC converter with a power frequency transformer.
Preferably, the battery priority mode, the mains supply priority mode and the peak clipping and valley filling mode select different working modes through the panel according to actual needs of a user.
Preferably, the DC/AC converter and the grid-connected/off-grid conversion module are interconnected by an electric wire, and the grid-connected/off-grid conversion module and the commercial power are interconnected by an electric wire.
Preferably, the storage battery is electrically interconnected with a circuit formed by the MPPT module and the DC/AC converter by an electric wire.
Preferably, the commercial power is set to 220V alternating current.
A control method of an intelligent photovoltaic grid-connected and off-grid integrated energy storage inverter comprises the following steps:
one), when the system is used in a region with high electricity price, a user can set the working module to be in a battery priority mode, and the working mode at the moment is as follows:
A. when the photovoltaic energy generated by the photovoltaic panel is sufficient, after the photovoltaic energy is controlled by the MPPT module, part of energy is converted by the DC/AC converter and then is supplied to a load, the redundant energy is charged to the storage battery, and finally the redundant photovoltaic energy is sold to a commercial power grid after the storage battery is fully charged;
B. when the photovoltaic energy generated by the photovoltaic panel is insufficient, the photovoltaic energy and the battery energy are converted together by the DC/AC converter to supply power to the load;
C. when the photovoltaic power does not generate energy and the storage battery is not powered, the commercial power supplies power for the load;
two) when using in the area that often has a power failure, when the commercial power grid has a power failure, when using as stand-by power supply, the user can set up work module for commercial power priority mode, and the working method at this moment is:
D. when the photovoltaic energy generated by the photovoltaic panel is sufficient, the MPPT module controls a part of energy to be converted by the DC/AC converter and then supply power to a load, the redundant energy charges the storage battery, and when the storage battery is fully charged, the redundant photovoltaic energy is finally sold to a power grid;
E. when the photovoltaic energy generated by the photovoltaic panel is insufficient, the photovoltaic energy is converted by the DC/AC converter and then supplies power to the load together with the commercial power energy;
F. when the photovoltaic energy generated by the photovoltaic panel is insufficient and the commercial power is cut off, the system is switched to an off-grid working mode, and the photovoltaic energy and the energy of the storage battery are converted by the DC/AC converter together and then supply power to the load;
when the peak-valley difference electricity price difference meter is used in a region with a large peak-valley difference electricity price difference, a user can set the working module to be in a peak clipping and valley filling mode, and the working mode at the moment is as follows:
G. in the electricity consumption valley period, when the photovoltaic energy generated by the photovoltaic panel is sufficient, the photovoltaic energy is controlled by the MPPT module and then is charged to the storage battery, the load is supplied by commercial power, when the storage battery is fully charged, the redundant photovoltaic energy is converted by the DC/AC converter and then is supplied to the load, and finally the residual electricity is sold to the power grid;
H. in the electricity consumption valley period, when the photovoltaic energy generated by the photovoltaic panel is insufficient, the photovoltaic energy is controlled by the MPPT module and then charges the storage battery, the commercial power is rectified by the DC/AC converter and then also charges the battery, and the load is powered by the commercial power;
I. in the peak period of power utilization, when the photovoltaic energy generated by the photovoltaic panel is sufficient, the photovoltaic energy is controlled by the MPPT module and then is converted into full power output by the DC/AC converter, the use of a load is met firstly, and redundant power selling is carried out to a power grid;
J. in the peak period of power utilization, when the photovoltaic energy generated by the photovoltaic panel is insufficient, the photovoltaic energy is controlled by the MPPT module and then is converted into full power output together with the storage battery through the DC/AC converter, the use of a load is met firstly, and redundant power selling is carried out to a power grid;
K. during the peak period of electricity utilization, when the photovoltaic generated by the photovoltaic panel has no power generation energy, the storage battery is converted into full power output through the DC/AC converter, the load use is firstly met, and redundant electricity is sold to the power grid.
The invention has the technical effects and advantages that:
1. the invention provides an intelligent photovoltaic grid-connected and grid-disconnected integrated energy storage inverter and a control method thereof, which have the selection of multiple working modes of a mains supply priority mode, a battery priority mode and a peak clipping and valley filling mode so as to achieve the functions of spontaneous self-use of photovoltaic power generation, balance on-line, peak clipping and valley filling, grid support, a backup power supply and the like, and have the effects of less charging and discharging times of a storage battery, longer service life and no waste of photovoltaic energy no matter which working mode the intelligent photovoltaic grid-connected and grid-disconnected integrated energy storage inverter works in;
2. according to the invention, the battery priority mode is selected in a high-price area, the photovoltaic energy is preferentially used, and the commercial power is used as the final supplementary power supply only when the photovoltaic energy and the storage battery are insufficient, so that the photovoltaic energy can be fully utilized, and the power consumption cost is greatly reduced;
3. according to the method, the mains supply priority mode is selected in the area with frequent power failure, the photovoltaic energy is preferentially used, when the photovoltaic energy is insufficient, the mains supply supplements power supply, and when the mains supply is powered off, the storage battery is used as the final supplementary power supply, so that the photovoltaic energy can be fully utilized, the charging times of the storage battery are greatly reduced, and the service life of the storage battery is prolonged to the maximum extent;
4. according to the invention, by selecting the peak clipping and valley filling mode in the area with large peak-valley difference electricity price difference, the inverter works under the premise of meeting the use of local loads, the inverter preferentially surfs the internet to sell electricity, preferentially charges the storage battery during the electricity consumption valley period, stores photovoltaic energy, performs peak clipping and valley filling according to the set electricity consumption peak-valley time period, lightens the pressure of a power grid, earns the electricity price difference of the peak valley, and the corresponding income of the area with larger difference is higher.
Drawings
FIG. 1 is a system framework diagram of the present invention.
Fig. 2 is a schematic diagram of the electrical circuit of the present invention.
Fig. 3 is a working flow chart of the invention when the photovoltaic energy is sufficient.
Fig. 4 is a flow chart of the operation of the present invention in the battery priority mode when the photovoltaic energy is insufficient.
Fig. 5 is a flow chart of the operation of the present invention when the photovoltaic energy is insufficient and the battery is dead in the battery priority mode.
Fig. 6 is a flow chart of the present invention when the photovoltaic energy is insufficient in the utility power priority mode.
Fig. 7 is a flow chart of the operation of the photovoltaic power generation system when the photovoltaic power is insufficient and the commercial power is cut off.
Fig. 8 is a flow chart of the present invention operating in the peak clipping and valley filling mode when the photovoltaic energy is sufficient during the valley period of the power consumption.
Fig. 9 is a flow chart of the present invention operating in peak clipping and valley filling mode when the photovoltaic energy is insufficient during the low-valley period of power consumption.
Fig. 10 is a flow chart of the present invention operating in peak clipping and valley filling mode when the photovoltaic energy is sufficient during peak period of power consumption.
Fig. 11 is a flow chart of the present invention operating in peak clipping and valley filling mode when the photovoltaic energy is insufficient during peak hours of electricity utilization.
Fig. 12 is a flow chart of the present invention operating in a peak clipping and valley filling mode, and during peak hours of electricity consumption, photovoltaic power generation does not generate energy.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention provides an intelligent photovoltaic grid-connected and off-grid integrated energy storage inverter as shown in fig. 1 to 12, which comprises a photovoltaic panel, a storage battery, a 220V alternating current mains supply and three working modes, and further comprises:
the MPPT module is used for controlling the input of energy generated by the photovoltaic panel and the maximum power point tracking;
the DC/AC converter is used for converting direct current processed by the MPPT module and the storage battery into alternating current required by a load and is connected to the grid, and further is a DC/AC converter with a power frequency transformer;
the grid-connected/off-grid conversion module is used for controlling grid-connected work operation or off-grid work operation;
the three working modes are set as a battery priority mode, a mains supply priority mode and a peak clipping and valley filling mode.
The system also comprises a DSP digital processor module used for acquiring signals and controlling the working states of the MPPT module, the DC/AC converter and the grid-connected/off-grid conversion module, and the DSP digital processor module is electrically connected with a display/external communication module.
The battery priority mode, the commercial power priority mode and the peak clipping and valley filling mode select different working modes through the panel according to the actual needs of users.
The DC/AC converter and the grid-connected/off-grid conversion module are mutually connected through electric wires, the grid-connected/off-grid conversion module is mutually connected with the commercial power through electric wires, and the storage battery, the MPPT module and a circuit formed by the DC/AC converter are mutually connected through electric wires.
Through the arrangement, the photovoltaic power generation system has the selection of multiple working modes including the mains supply priority mode, the battery priority mode and the peak clipping and valley filling mode, so that the functions of spontaneous self-use of photovoltaic power generation, balance internet surfing, peak clipping and valley filling, power grid support, back-up power supply and the like are achieved, and the photovoltaic power generation system has the effects of few storage battery charging and discharging times, long service life and no waste of photovoltaic energy no matter which working mode the photovoltaic power generation system works in.
Example 2
A control method of an intelligent photovoltaic grid-connected and off-grid integrated energy storage inverter comprises the following steps:
one), when the system is used in a region with high electricity price, a user can set the working module to be in a battery priority mode, and the working mode at the moment is as follows:
A. when the photovoltaic energy generated by the photovoltaic panel is sufficient, after the photovoltaic energy is controlled by the MPPT module, part of energy is converted by the DC/AC converter to supply power to a load, redundant energy is charged to the storage battery, and finally the redundant photovoltaic energy is sold to a commercial power grid (refer to fig. 3) after the storage battery is fully charged;
B. when the photovoltaic energy generated by the photovoltaic panel is insufficient, the photovoltaic energy and the battery energy are converted together through the DC/AC converter to supply power to the load (refer to FIG. 4);
C. when the photovoltaic power generation energy is not available and the storage battery is not available, the commercial power supplies power to the load (refer to fig. 5);
through the arrangement, the photovoltaic energy is preferentially used, and the commercial power is used as the final supplementary power supply only when the photovoltaic energy and the storage battery are insufficient, so that the photovoltaic energy can be fully utilized, and the power consumption cost is greatly reduced;
two) when using in the area that often has a power failure, when the commercial power grid has a power failure, when using as stand-by power supply, the user can set up work module for commercial power priority mode, and the working method at this moment is:
D. when the photovoltaic energy generated by the photovoltaic panel is sufficient, the MPPT module controls a part of energy to be converted by the DC/AC converter and then supply power to a load, the redundant energy charges the storage battery, and when the storage battery is fully charged, the redundant photovoltaic energy is finally sold to a power grid (refer to fig. 3);
E. when the photovoltaic energy generated by the photovoltaic panel is insufficient, the photovoltaic energy is converted by the DC/AC converter and then supplies power to the load together with the commercial power energy (refer to FIG. 6);
F. when the photovoltaic energy generated by the photovoltaic panel is insufficient and the commercial power is cut off, the system is switched to an off-grid working mode, and the photovoltaic energy and the energy of the storage battery are converted by the DC/AC converter together to supply power to the load (refer to FIG. 7);
through the arrangement, the photovoltaic energy is preferentially used, when the photovoltaic energy is insufficient, the commercial power supplies power supplementarily, and when the commercial power is cut off, the storage battery serves as the final supplementary power supply, so that the photovoltaic energy can be fully utilized, the charging times of the storage battery are greatly reduced, and the service life of the storage battery is prolonged to the maximum extent;
when the difference between peak and valley is large, the user can set the working module to be in a peak clipping and valley filling mode, and the working mode at the moment is as follows:
G. in the electricity consumption valley period, when the photovoltaic energy generated by the photovoltaic panel is sufficient, the photovoltaic energy is controlled by the MPPT module and then is charged to the storage battery, the load is supplied by commercial power, when the storage battery is fully charged, the redundant photovoltaic energy is converted by the DC/AC converter and then is supplied to the load, and finally the residual electricity is sold to the power grid (refer to fig. 8);
H. in the electricity consumption valley period, when the photovoltaic energy generated by the photovoltaic panel is insufficient, the photovoltaic energy is controlled by the MPPT module and then charges the storage battery, the commercial power is rectified by the DC/AC converter and then also charges the battery, and the load is powered by the commercial power (refer to fig. 9);
I. in the peak period of power utilization, when the photovoltaic energy generated by the photovoltaic panel is sufficient, the photovoltaic energy is controlled by the MPPT module and then is converted into full power output by the DC/AC converter, the use of a load is firstly met, and redundant power is sold to a power grid (refer to fig. 10);
J. in the peak period of power consumption, when the photovoltaic energy generated by the photovoltaic panel is insufficient, the photovoltaic energy is controlled by the MPPT module and then is converted into full power output together with the storage battery through the DC/AC converter, the use of a load is firstly met, and redundant power selling is carried out to a power grid (refer to fig. 11);
K. in the peak period of electricity utilization, when the photovoltaic generated by the photovoltaic panel has no power generation energy, the storage battery is converted into full power output through the DC/AC converter, the use of a load is firstly met, and redundant electricity is sold to a power grid (refer to fig. 12);
through the arrangement, the inverter works on the premise of meeting the use of local loads, the inverter preferentially surfs the internet and sells electricity, the storage battery is preferentially charged during electricity consumption low-valley time periods, photovoltaic energy is stored, peak clipping and valley filling are carried out according to the set electricity consumption peak-valley time periods, the pressure of a power grid is relieved, the electricity price difference of peak valley is earned, and the corresponding income of areas with larger price difference is higher.
More specifically, the MPPT module, the grid-connected/off-grid conversion module, the DC/AC converter, the storage battery, the DSP digital processor module, and the display/external communication module of the present invention are all general standard components or components known to those skilled in the art, and the structure and principle thereof can be known to those skilled in the art through a technical manual or through a conventional experimental method.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (8)
1. The utility model provides an intelligent photovoltaic is and is separated integrative energy storage inverter of net, includes photovoltaic board, battery, commercial power and three kinds of mode, its characterized in that still includes:
the MPPT module is used for controlling the input of energy generated by the photovoltaic panel and the maximum power point tracking;
the DC/AC converter is used for converting the direct current processed by the MPPT module and the storage battery into alternating current required by a load and is connected to the grid;
the grid-connected/off-grid conversion module is used for controlling grid-connected work operation or off-grid work operation;
the three working modes are set as a battery priority mode, a mains supply priority mode and a peak clipping and valley filling mode.
2. The intelligent photovoltaic grid-connected and off-grid integrated energy storage inverter according to claim 1, wherein: the system also comprises a DSP digital processor module used for acquiring signals and controlling the working states of the MPPT module, the DC/AC converter and the grid-connected/off-grid conversion module, and the DSP digital processor module is electrically connected with a display/external communication module.
3. The intelligent photovoltaic grid-connected and off-grid integrated energy storage inverter according to claim 1, wherein: the DC/AC converter is a DC/AC converter with a power frequency transformer.
4. The intelligent photovoltaic grid-connected and off-grid integrated energy storage inverter according to claim 1, wherein: the battery priority mode, the commercial power priority mode and the peak clipping and valley filling mode select different working modes through the panel according to the actual needs of users.
5. The intelligent photovoltaic grid-connected and off-grid integrated energy storage inverter according to claim 1, wherein: the DC/AC converter and the grid-connected/off-grid conversion module are mutually connected through electric wires, and the grid-connected/off-grid conversion module and the commercial power are mutually connected through the electric wires.
6. The intelligent photovoltaic grid-connected and off-grid integrated energy storage inverter according to claim 1, wherein: the battery is electrically interconnected with a circuit formed by the MPPT module and the DC/AC converter by wires.
7. The intelligent photovoltaic grid-connected and off-grid integrated energy storage inverter according to claim 1, wherein: the commercial power is set to 220V alternating current.
8. A control method of an intelligent photovoltaic grid-connected and off-grid integrated energy storage inverter is characterized by comprising the following steps:
one), when the system is used in a region with high electricity price, a user can set the working module to be in a battery priority mode, and the working mode at the moment is as follows:
A. when the photovoltaic energy generated by the photovoltaic panel is sufficient, after the photovoltaic energy is controlled by the MPPT module, part of energy is converted by the DC/AC converter and then is supplied to a load, the redundant energy is charged to the storage battery, and finally the redundant photovoltaic energy is sold to a commercial power grid after the storage battery is fully charged;
B. when the photovoltaic energy generated by the photovoltaic panel is insufficient, the photovoltaic energy and the battery energy are converted together by the DC/AC converter to supply power to the load;
C. when the photovoltaic power does not generate energy and the storage battery is not powered, the commercial power supplies power for the load;
two) when using in the area that often has a power failure, when the commercial power grid has a power failure, when using as stand-by power supply, the user can set up work module for commercial power priority mode, and the working method at this moment is:
D. when the photovoltaic energy generated by the photovoltaic panel is sufficient, the MPPT module controls a part of energy to be converted by the DC/AC converter and then supply power to a load, the redundant energy charges the storage battery, and when the storage battery is fully charged, the redundant photovoltaic energy is finally sold to a power grid;
E. when the photovoltaic energy generated by the photovoltaic panel is insufficient, the photovoltaic energy is converted by the DC/AC converter and then supplies power to the load together with the commercial power energy;
F. when the photovoltaic energy generated by the photovoltaic panel is insufficient and the commercial power is cut off, the system is switched to an off-grid working mode, and the photovoltaic energy and the energy of the storage battery are converted by the DC/AC converter together and then supply power to the load;
when the peak-valley difference electricity price difference meter is used in a region with a large peak-valley difference electricity price difference, a user can set the working module to be in a peak clipping and valley filling mode, and the working mode at the moment is as follows:
G. in the electricity consumption valley period, when the photovoltaic energy generated by the photovoltaic panel is sufficient, the photovoltaic energy is controlled by the MPPT module and then is charged to the storage battery, the load is supplied by commercial power, when the storage battery is fully charged, the redundant photovoltaic energy is converted by the DC/AC converter and then is supplied to the load, and finally the residual electricity is sold to the power grid;
H. in the electricity consumption valley period, when the photovoltaic energy generated by the photovoltaic panel is insufficient, the photovoltaic energy is controlled by the MPPT module and then charges the storage battery, the commercial power is rectified by the DC/AC converter and then also charges the battery, and the load is powered by the commercial power;
I. in the peak period of power utilization, when the photovoltaic energy generated by the photovoltaic panel is sufficient, the photovoltaic energy is controlled by the MPPT module and then is converted into full power output by the DC/AC converter, the use of a load is met firstly, and redundant power selling is carried out to a power grid;
J. in the peak period of power utilization, when the photovoltaic energy generated by the photovoltaic panel is insufficient, the photovoltaic energy is controlled by the MPPT module and then is converted into full power output together with the storage battery through the DC/AC converter, the use of a load is met firstly, and redundant power selling is carried out to a power grid;
K. during the peak period of electricity utilization, when the photovoltaic generated by the photovoltaic panel has no power generation energy, the storage battery is converted into full power output through the DC/AC converter, the load use is firstly met, and redundant electricity is sold to the power grid.
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| CN111463813A (en) * | 2020-05-07 | 2020-07-28 | 上海电机学院 | Household micro-grid system capable of participating in power grid energy optimization configuration |
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