CN110994679A - Three-phase inverter based on inverse control integration and control method thereof - Google Patents
Three-phase inverter based on inverse control integration and control method thereof Download PDFInfo
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- H02J9/062—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 AC 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a three-phase inverter based on inverse control integration and a control method thereof, which relate to the technical field of photovoltaic off-grid three-phase power generation, and comprise a photovoltaic panel, a storage battery, a three-phase commercial power supply and three working modes, and a photovoltaic controller module, wherein the photovoltaic controller module is used for controlling the input of photovoltaic energy of the photovoltaic panel; the DC/AC converter is used for converting the direct current processed by the photovoltaic controller module and the direct current of the storage battery into alternating current required by a load; the commercial power bypass module is used for switching commercial power to supply power to a load or charge a storage battery. The photovoltaic off-grid three-phase power generation system combines the three-phase inverter and the photovoltaic controller together, supports the complementary input of commercial power, supports three-phase unbalanced load, and has three freely switchable working modes of a commercial power priority mode, a battery priority mode and an energy-saving mode, so that the intelligentization of the photovoltaic off-grid three-phase power generation system is achieved, the compatibility of the system is greatly improved, the power consumption requirements of different users are met, and the system cost is reduced.
Description
Technical Field
The invention relates to the technical field of photovoltaic off-grid three-phase power generation, in particular to a three-phase inverter based on inverse control integration and a control method thereof.
Background
In the field of traditional solar photovoltaic off-grid three-phase power generation, a solar photovoltaic off-grid three-phase power generation system generally comprises a solar photovoltaic module, a photovoltaic controller, a three-phase inverter, a storage battery pack and the like. The working mode is generally as follows: when the photovoltaic energy is sufficient, the photovoltaic supplies power to the load and charges the battery; when the photovoltaic energy is insufficient, the load is powered by the photovoltaic and the battery together; when the photovoltaic does not have the power generation energy, the battery supplies power to the load, and when the photovoltaic does not have the power generation energy and the battery does not have the power, the whole system is shut down, and the load cannot be used. However, the solar photovoltaic off-grid three-phase power generation system has the following problems:
1. the photovoltaic controller and the three-phase inverter are separated (namely, a photovoltaic controller and a three-phase inverter are needed), and the method has the disadvantages of complicated field wiring and more required cables.
2. The traditional three-phase inverter in the system does not support the complementary input of commercial power (or a diesel and gasoline generator), when the photovoltaic in the system does not have power generation energy and the battery does not have power, the whole system is shut down, the load cannot be used, and the intellectualization cannot be realized.
Therefore, it is necessary to provide a three-phase inverter based on inverse control integration to solve the above problems.
Disclosure of Invention
The invention aims to provide a three-phase inverter based on inverse control integration 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 a three-phase inverter based on it is integrative to reverse accuse, includes photovoltaic board, battery, three-phase commercial power and three kinds of mode, still includes:
the photovoltaic controller module is used for controlling the input of photovoltaic energy of the photovoltaic panel;
the DC/AC converter is used for converting the direct current processed by the photovoltaic controller module and the direct current of the storage battery into alternating current required by a load;
the commercial power bypass module is used for switching commercial power to supply power to a load or charge a storage battery;
the DSP digital processor module is used for overall control of the working states of the photovoltaic controller module, the DC/AC converter and the commercial power bypass module;
the three working modes are set to be a battery priority mode, a commercial power priority mode and an energy-saving mode.
Preferably, the connecting end of the DSP digital processor module is provided with a display/external communication module for display and communication.
Preferably, the utility power bypass module is set as a relay or an SCR thyristor and related control circuit.
Preferably, the DC/AC converter comprises a power converter and a transformer;
the power converter comprises an A-phase power module, a B-phase power module and a C-phase power module;
the transformer comprises an A-phase transformer, a B-phase transformer and a C-phase transformer.
Preferably, the power converter is an IGBT module or a field effect transistor MOSFET.
Preferably, the power converter and the transformer are provided in three.
Preferably, the DC/AC converter is configured as a bidirectional converter.
Preferably, the photovoltaic controller module is a photovoltaic MPPT controller or a photovoltaic PWM controller.
The invention also provides a control method of the three-phase inverter based on the inverse control integration, which comprises the following specific steps:
one) when the operation mode is set to the battery priority mode, the operation mode at this time is as follows:
A. when the photovoltaic energy is sufficient, the photovoltaic energy in the photovoltaic panel is controlled by the photovoltaic controller module, then a part of energy is converted by the DC/AC converter and then supplies power to the load, and the redundant energy is used for charging the storage battery;
B. when the photovoltaic energy is insufficient, 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;
C. when the photovoltaic power generation energy is not available and the storage battery is not powered, the commercial power bypass module is put into operation, and three-phase commercial power supplies power to the load through the commercial power bypass module;
D. when the photovoltaic has power generation energy but the electric quantity of the storage battery is insufficient, the commercial power bypass module is put into operation, three-phase commercial power supplies power to the load through the commercial power bypass module, and the photovoltaic energy charges the battery;
E. when the photovoltaic energy is full of the storage battery, the system is automatically switched back to the storage battery inversion mode from the commercial power bypass power supply mode;
second) when the working mode is set to be the mains supply priority mode, the working mode at this time is as follows:
F. the three-phase commercial power supplies power to the load through the commercial power bypass module, and the photovoltaic energy is controlled by the photovoltaic controller module and then all the energy is used for charging the storage battery;
G. when the three-phase commercial power is abnormal, the photovoltaic energy is controlled by the photovoltaic controller module, then a part of energy is converted by the DC/AC converter and then supplies power to the load, and the redundant energy charges the storage battery;
H. when the photovoltaic energy is insufficient, 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;
I. when the commercial power is recovered to be normal, the system is automatically switched to a commercial power bypass to supply power to the load;
and thirdly) when the working mode is set to be the energy-saving mode, when the inverter works in the inversion state, the DSP module can collect the current output load condition, if the inverter does not receive the load currently, the inverter can be in the standby state, the waste of the energy of the photovoltaic and the storage battery is avoided, and when the load is detected, the inverter is automatically turned on again to operate.
The invention has the technical effects and advantages that:
1. the photovoltaic off-grid three-phase power generation system combines the three-phase inverter and the photovoltaic controller together, supports the complementary input of commercial power, supports three-phase unbalanced load, and has three freely switchable working modes of a commercial power priority mode, a battery priority mode and an energy-saving mode, so that the intellectualization of the photovoltaic off-grid three-phase power generation system is achieved, the compatibility of the system is greatly improved, the power consumption requirements of different users are met, and the system cost is reduced;
2. the system disclosed by the invention has the advantages that the DSP digital processor module is used for overall control and processing, so that the output phase difference is 120 degrees, the three-phase power output is realized, and the system supports 100% three-phase unbalanced load and independent power loops due to the three independent power converters and transformers, so that the system is wider in compatibility, stronger in load capacity and better in stability.
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 working flow chart of the photovoltaic energy shortage of the invention.
Fig. 5 is a flow chart of the operation of the photovoltaic power generation system of the invention when the photovoltaic power generation system does not generate power and the storage battery is not powered.
Fig. 6 is a flow chart of the operation of the invention when the photovoltaic capacity is sufficient and the storage battery is dead.
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 a three-phase inverter based on inverse control integration, which comprises a photovoltaic panel, a storage battery, a three-phase commercial power and three working modes, and further comprises the following steps:
the photovoltaic controller module is used for controlling the input of photovoltaic energy of the photovoltaic panel;
the DC/AC converter is used for converting the direct current processed by the photovoltaic controller module and the direct current of the storage battery into alternating current required by a load;
the commercial power bypass module is used for switching commercial power to supply power to a load or charge a storage battery;
the DSP digital processor module is used for overall control of the working states of the photovoltaic controller module, the DC/AC converter and the commercial power bypass module;
the three working modes are set to be a battery priority mode, a commercial power priority mode and an energy-saving mode.
And a display/external communication module for display and communication is arranged at the connecting end of the DSP module.
The utility power bypass module is set to be a relay or SCR silicon controlled rectifier and related control circuit, and when the relay or the SCR silicon controlled rectifier are closed, the system is powered by the three-phase utility power bypass.
The DC/AC converter comprises a power converter and a transformer; the power converter comprises an A-phase power module, a B-phase power module and a C-phase power module; the transformer comprises an A-phase transformer, a B-phase transformer and a C-phase transformer.
The power converter is an IGBT module or a field effect transistor MOSFET.
The power converter and the transformer are all provided with three. Control through DSP digital processor module overall planning is handled for its output phase difference 120 realizes the output of three-phase electricity, and owing to be three independent power converter and transformer, consequently, this system supports 100% unbalanced three-phase area and carries, independent power return circuit, makes the system compatibility wider, and the area carries the ability stronger, and stability is better.
The DC/AC converter is set as a bidirectional converter, and in the commercial power working state, the DSP digital processor module controls the pulse drive DC/AC converter to rectify and convert into direct current to charge the battery.
The photovoltaic controller module is a photovoltaic MPPT controller or a photovoltaic PWM controller.
Through foretell setting, combine three-phase inverter and photovoltaic controller together, and support the complementary input of commercial power, still support unbalanced three-phase area and carry, have commercial power priority mode, battery priority mode and energy-conserving mode three kinds of working modes that can freely switch simultaneously to reach photovoltaic off-grid three-phase power generation system's intellectuality, provide the compatibility of system greatly, satisfy different users' power consumption demand, reduce system cost.
Example 2
The invention discloses a control method of a three-phase inverter based on inverse control integration, which comprises the following specific steps:
one) when the operation mode is set to the battery priority mode, the operation mode at this time is as follows:
A. when the photovoltaic energy is sufficient, the photovoltaic energy in the photovoltaic panel is controlled by the photovoltaic controller module, then a part of energy is converted by the DC/AC converter and then supplies power to the load, and the redundant energy is used for charging the storage battery (see fig. 3);
B. when the photovoltaic energy is insufficient, the photovoltaic energy and the energy of the storage battery are converted together through a DC/AC converter to supply power to a load (see figure 4);
C. when the photovoltaic power generation energy is not available and the storage battery is not available, the commercial power bypass module is put into operation, and three-phase commercial power supplies power to the load through the commercial power bypass module (see fig. 5);
D. when the photovoltaic has power generation energy but the storage battery is insufficient in electric quantity, the commercial power bypass module is put into operation, three-phase commercial power supplies power to the load through the commercial power bypass module, and the photovoltaic energy charges the battery (see fig. 6);
E. when the photovoltaic energy is full of the storage battery, the system is automatically switched back to the storage battery inversion mode from the mains supply bypass power supply mode, in the working mode, the photovoltaic energy is preferentially used, when the photovoltaic energy and the storage battery are insufficient, the three-phase mains supply is automatically switched to work, the load is continuously supplied with power, and the intellectualization of the solar photovoltaic off-grid three-phase power generation system is realized;
second) when the working mode is set to be the mains supply priority mode, the working mode at this time is as follows:
F. the three-phase mains supply supplies power to the load through the mains supply bypass module, and the photovoltaic energy is controlled by the photovoltaic controller module and then is fully charged to the storage battery (see fig. 6);
G. when the three-phase commercial power is abnormal, after the photovoltaic energy is controlled by the photovoltaic controller module, part of the energy is converted by the DC/AC converter and then supplies power to the load, and the redundant energy charges the storage battery (see fig. 3);
H. when the photovoltaic energy is insufficient, the photovoltaic energy and the energy of the storage battery are converted together through a DC/AC converter to supply power to a load (see figure 4);
I. when the mains supply is recovered to be normal, the system is automatically switched to a mains supply bypass to supply power to the load, in the working mode, the load of the technical scheme preferentially uses the mains supply energy, and when the three-phase mains supply is powered off, the storage battery is used as the final supplementary power supply, the method can be suitable for places with frequent power failure, the system is used as a backup power supply, the charging times of the storage battery are greatly reduced, and the service life of the storage battery is prolonged to the maximum extent;
and thirdly) when the working mode is set to be the energy-saving mode, when the inverter works in the inversion state, the DSP module can collect the current condition of the output load, and if the inverter does not receive the load, the inverter can be in the standby state, so that the energy waste of the photovoltaic and the storage battery is avoided (because the inverter has empty load loss during no-load operation), and when the load is detected, the inverter is automatically turned on again to realize the energy-saving effect.
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 (9)
1. The utility model provides a three-phase inverter based on it is integrative to reverse accuse, includes photovoltaic board, battery, three-phase commercial power and three kinds of mode, its characterized in that still includes:
the photovoltaic controller module is used for controlling the input of photovoltaic energy of the photovoltaic panel;
the DC/AC converter is used for converting the direct current processed by the photovoltaic controller module and the direct current of the storage battery into alternating current required by a load;
the commercial power bypass module is used for switching commercial power to supply power to a load or charge a storage battery;
the DSP digital processor module is used for overall control of the working states of the photovoltaic controller module, the DC/AC converter and the commercial power bypass module;
the three working modes are set to be a battery priority mode, a commercial power priority mode and an energy-saving mode.
2. The inverter of claim 1, wherein the inverter comprises: and a display/external communication module for display and communication is arranged at the connecting end of the DSP module.
3. The inverter of claim 1, wherein the inverter comprises: the commercial power bypass module is set to be a relay or SCR silicon controlled rectifier and related control circuit.
4. The inverter of claim 1, wherein the inverter comprises: the DC/AC converter comprises a power converter and a transformer;
the power converter comprises an A-phase power module, a B-phase power module and a C-phase power module;
the transformer comprises an A-phase transformer, a B-phase transformer and a C-phase transformer.
5. The inverter of claim 4, wherein the inverter comprises: the power converter is an IGBT module or a field effect transistor MOSFET.
6. The inverter of claim 4, wherein the inverter comprises: the power converter and the transformer are all provided with three.
7. The inverter of claim 1, wherein the inverter comprises: the DC/AC converter is configured as a bidirectional converter.
8. The inverter of claim 1, wherein the inverter comprises: the photovoltaic controller module is a photovoltaic MPPT controller or a photovoltaic PWM controller.
9. A control method of a three-phase inverter based on inverse control integration is characterized by comprising the following specific steps:
one) when the operation mode is set to the battery priority mode, the operation mode at this time is as follows:
A. when the photovoltaic energy is sufficient, the photovoltaic energy in the photovoltaic panel is controlled by the photovoltaic controller module, then a part of energy is converted by the DC/AC converter and then supplies power to the load, and the redundant energy is used for charging the storage battery;
B. when the photovoltaic energy is insufficient, 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;
C. when the photovoltaic power generation energy is not available and the storage battery is not powered, the commercial power bypass module is put into operation, and three-phase commercial power supplies power to the load through the commercial power bypass module;
D. when the photovoltaic has power generation energy but the electric quantity of the storage battery is insufficient, the commercial power bypass module is put into operation, three-phase commercial power supplies power to the load through the commercial power bypass module, and the photovoltaic energy charges the battery;
E. when the photovoltaic energy is full of the storage battery, the system is automatically switched back to the storage battery inversion mode from the commercial power bypass power supply mode;
second) when the working mode is set to be the mains supply priority mode, the working mode at this time is as follows:
F. the three-phase commercial power supplies power to the load through the commercial power bypass module, and the photovoltaic energy is controlled by the photovoltaic controller module and then all the energy is used for charging the storage battery;
G. when the three-phase commercial power is abnormal, the photovoltaic energy is controlled by the photovoltaic controller module, then a part of energy is converted by the DC/AC converter and then supplies power to the load, and the redundant energy charges the storage battery;
H. when the photovoltaic energy is insufficient, 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;
I. when the commercial power is recovered to be normal, the system is automatically switched to a commercial power bypass to supply power to the load;
and thirdly) when the working mode is set to be the energy-saving mode, when the inverter works in the inversion state, the DSP module can collect the current output load condition, if the inverter does not receive the load currently, the inverter can be in the standby state, the waste of the energy of the photovoltaic and the storage battery is avoided, and when the load is detected, the inverter is automatically turned on again to operate.
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| CN211209310U (en) * | 2019-12-16 | 2020-08-07 | 广东欣顿电源科技有限公司 | Three-phase inverter based on inverse control integration |
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