CN111262336A - Flexible uninterruptible power supply device and control method and system thereof - Google Patents
Flexible uninterruptible power supply device and control method and system thereof Download PDFInfo
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- CN111262336A CN111262336A CN201811457408.6A CN201811457408A CN111262336A CN 111262336 A CN111262336 A CN 111262336A CN 201811457408 A CN201811457408 A CN 201811457408A CN 111262336 A CN111262336 A CN 111262336A
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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
- H02J9/08—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 requiring starting of a prime-mover
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
Abstract
The application discloses a flexible uninterruptible power supply device comprises an alternating current bus, a direct current bus, a first switch, a direct current-alternating current converter, a storage battery pack, a first direct current-direct current converter, at least one second direct current-direct current converter, a second switch and a third switch. One end of the first switch is used for connecting a mains supply network, and the other end of the first switch is connected with an alternating current bus; two ends of the DC-AC converter are respectively electrically connected with the DC bus and the AC bus; the input end of the first direct current-direct current converter is electrically connected with the storage battery pack through a second switch, and the output end of the first direct current-direct current converter is electrically connected with the direct current bus; the input end of the second DC-DC converter is used for connecting the renewable resource power generation device, and the output end of the second DC-DC converter is electrically connected with the DC bus. One end of the third switch is electrically connected with the alternating current bus, and the other end of the third switch is electrically connected with the internal combustion engine power generation device. The storage battery pack only supplies power to the electric load within a limited time, so that the purpose of protecting the storage battery pack is realized, and the use cost is reduced.
Description
Technical Field
The present disclosure relates to the field of power supply technologies, and more particularly, to a flexible uninterruptible power supply device and a control method and system thereof.
Background
UPS (Uninterruptible Power Supply) is one of the common devices of the current important load standby Power Supply, has the characteristics of simple topological structure, single Power Supply and the like, has a widely applied market, and is widely applied to important loads such as data centers, medical equipment, transformer substation secondary protection equipment, railway core equipment and the like.
The UPS generally consists of a battery pack, an inverter, and a control circuit; one end of the UPS is connected with the power distribution network, the other end of the UPS is connected with the power load, the UPS charges the storage battery pack by using the power supply of the power distribution network under the condition that the voltage of the power distribution network is normal, and the UPS releases the electric energy of the storage battery pack for the power load to use when the power distribution network is abnormal.
However, the access power supply of the conventional UPS is too single, and basically only a storage battery pack is provided, if a large-area power failure or frequent power failure occurs to the mains supply, the configured storage battery pack is over-discharged, so that the replacement cycle of the storage battery pack is shortened, and the use cost of the storage battery pack is higher.
Disclosure of Invention
In view of this, the present application provides a flexible uninterruptible power supply device, a control method and a system thereof, which are used to solve the problem of high use cost of the current uninterruptible power supply due to overdischarge.
In order to achieve the above object, the following solutions are proposed:
a flexible uninterruptible power supply device comprising an ac bus, a dc bus, a first switch, a dc-ac converter, a battery pack, a first dc-dc converter, at least one second dc-dc converter, a second switch, and a third switch, wherein:
the alternating current bus is used for outputting electric energy to an electric load;
one end of the first switch is used for connecting a mains supply network, and the other end of the first switch is connected with the alternating current bus and is configured to be closed when the mains supply network supplies power normally and be opened when the power supply is abnormal;
the input end of the DC-AC converter is electrically connected with the DC bus, the output end of the DC-AC converter is electrically connected with the AC bus, and the DC-AC converter is configured to utilize the DC voltage of the DC bus to output AC electric energy to the AC bus when the power supply of the commercial power network is abnormal, and stop working when the power supply of the commercial power network is normal;
the input end of the first direct current-direct current converter is electrically connected with the storage battery pack, and the output end of the first direct current-direct current converter is electrically connected with the direct current bus;
the input end of the second DC-DC converter is used for connecting the renewable resource power generation device, and the output end of the second DC-DC converter is electrically connected with the DC bus.
The second switch is arranged on a lead for connecting the first direct current-direct current converter and the storage battery pack, is configured to be opened when the mains network supplies power normally, is also configured to be closed when the mains network supplies power abnormally and the renewable resource power generation device supplies power to the direct current bus abnormally, and is also configured to be opened when the mains network supplies power abnormally and the renewable resource power generation device supplies power to the direct current bus normally;
and one end of the third switch is electrically connected with the alternating current bus, and the other end of the third switch is electrically connected with the internal combustion engine power generation device and is configured to be conducted when the power supply of the commercial power network and the renewable resource power generation device are abnormally operated.
Optionally, the number of the second dc-dc converters is two, wherein:
the output end of the second direct current-direct current converter is electrically connected with the direct current bus, and the other end of the second direct current-direct current converter is electrically connected with the solar power generation device;
the output end of the other second direct current-direct current converter is electrically connected with the direct current bus, and the other end of the other second direct current-direct current converter is electrically connected with the wind power direct current power generation device.
A control method applied to the flexible uninterruptible power supply device includes:
acquiring the power supply state of the commercial power network;
and when the power supply of the commercial power network is abnormal, controlling the storage battery pack, the renewable resource power generation device or the internal combustion generator set to supply power to the power load.
Optionally, the controlling the storage battery pack, the renewable resource power generation device, or the internal combustion generator set to supply power to the electrical load according to the operating state includes:
when the running state of the renewable resource power generation device is normal, controlling the first switch to be switched off, and controlling the second direct current-direct current converter to work, so that the electric energy output by the renewable resource power generation device is transmitted to the direct current bus;
when the running state of the renewable resource power generation device is abnormal, controlling the third switch to be closed so that the internal combustion power generation device transmits electric energy to the alternating current bus;
and when the running state of the renewable resource power generation device and the running state of the internal combustion power generation device are both abnormal, controlling the second switch to be closed.
Optionally, the method further includes:
and when the power supply of the commercial power network is normal, controlling the renewable resource power generation device to charge the storage battery pack.
Optionally, the controlling the renewable resource power generation device to charge the storage battery pack includes:
controlling the second switch to close;
and controlling the first direct current-direct current conversion device to obtain electric energy from the direct current bus and output the electric energy to the storage battery pack.
A control system for the flexible uninterruptible power supply device, the control system comprising:
the state detection module is used for detecting the power supply state of the commercial power network;
and the switching control module is used for controlling the storage battery pack, the renewable resource power generation device or the internal combustion generator set to supply power to the power load when the power supply of the commercial power network is abnormal.
Optionally, the switching control system includes:
the first control unit is used for controlling the first switch to be switched off and controlling the second direct current-direct current converter to work when the running state of the renewable resource power generation device is normal, so that the electric energy output by the renewable resource power generation device is transmitted to the direct current bus;
the second control unit is used for controlling the third switch to be closed when the running state of the renewable resource power generation device is abnormal, so that the internal combustion power generation device can transmit electric energy to the alternating current bus;
and the third control unit is used for controlling the second switch to be closed when the running state of the renewable resource power generation device and the running state of the internal combustion power generation device are both abnormal.
Optionally, the method further includes:
and the charging control module is used for controlling the renewable resource power generation device to charge the storage battery pack when the power supply of the commercial power network is normal.
Optionally, the charging control module includes:
the fourth control unit is used for controlling the second switch to be closed;
and the fifth control unit is used for controlling the first direct current-direct current conversion device to obtain electric energy from the direct current bus and output the electric energy to the storage battery pack.
As can be seen from the above technical solutions, the present application discloses a flexible uninterruptible power supply device including an ac bus, a dc bus, a first switch, a dc-ac converter, a battery pack, a first dc-dc converter, at least one second dc-dc converter, a second switch, and a third switch. One end of the first switch is used for connecting a mains supply network, and the other end of the first switch is connected with an alternating current bus; the input end of the DC-AC converter is electrically connected with the DC bus, and the output end of the DC-AC converter is electrically connected with the AC bus; the input end of the first direct current-direct current converter is electrically connected with the storage battery pack through a second switch, and the output end of the first direct current-direct current converter is electrically connected with the direct current bus; the input end of the second DC-DC converter is used for connecting the renewable resource power generation device, and the output end of the second DC-DC converter is electrically connected with the DC bus. One end of the third switch is electrically connected with the alternating current bus, and the other end of the third switch is electrically connected with the internal combustion engine power generation device. The storage battery pack supplies power to the power load through the direct current-alternating current converter only when the renewable resource power generation device cannot work normally, so that the service time and the strength of the storage battery pack are reduced, the purpose of protecting the storage battery pack is achieved, the service life of the storage battery pack is prolonged, and the use cost is effectively reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a block diagram of a flexible uninterruptible power supply according to an embodiment of the present application;
fig. 2 is a block diagram of another flexible ups according to an embodiment of the present application;
fig. 3 is a block diagram of another flexible ups according to an embodiment of the present application;
FIG. 4 is a flow chart of a control method according to an embodiment of the present application;
FIG. 5 is a flow chart of another control method of the embodiments of the present application;
FIG. 6 is a block diagram of a control system according to an embodiment of the present application;
fig. 7 is a block diagram of another control system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
Example one
Fig. 1 is a block diagram of a flexible uninterruptible power supply device according to an embodiment of the present application.
As shown in fig. 1, the flexible uninterruptible power supply device provided in this embodiment is used for supplying power to a power load by using a storage battery pack and a resource power generation device, which can be said to be a resource power generation device, when a power supply of a utility grid is abnormal, and specifically includes a first switch k1, a second switch k2, a third switch k3, an ac bus 10, a dc bus 20, a dc-ac converter 30, a first dc-dc converter 40, at least one second dc-dc converter 50, and a storage battery pack 60.
One end of the first switch is used for connecting the commercial power network through a cable, the other end of the first switch is connected with the alternating current bus, so that alternating current of the commercial power network is output to the alternating current bus, and the electric load is connected with the alternating current bus through the corresponding cable.
In addition, the flexible uninterruptible power supply in this embodiment is connected to the storage battery pack, the renewable resource power generation device 100, and the internal combustion power generation device 200, so that the storage battery pack, the renewable resource power generation device, and/or the internal combustion power generation device can be used to supply power to the power load when the power supply of the utility grid is abnormal.
In order to achieve the above object, the input terminal of the first dc-dc converter is electrically connected to the dc bus, the output terminal is electrically connected to the secondary battery pack, and the second switch is provided on a cable for connecting the input terminal to the secondary battery pack.
The input end of the second DC-DC converter is connected with the renewable resource power generation device, the output end of the second DC-DC converter is connected with the DC bus, and when the second DC-DC converter works, the electric energy output by the renewable resource power generation device is converted and output to the DC bus through the power of the second DC-DC converter.
One end of the third switch is connected with the alternating current bus, and the other end of the third switch is electrically connected with the internal combustion power generation device.
The first switch is closed when the commercial power network is normal, and the DC-AC converter stops working, at the moment, only the commercial power network supplies power to the electric load through the AC bus. When the commercial power network is abnormal, in order to ensure normal power utilization of the power load, the first switch is disconnected, the direct current-foot force converter gets power from the direct current bus, and the converted alternating current is output to the alternating current bus.
The direct current on the direct current bus is from a storage battery pack or a renewable resource power generation device. The second switch is arranged on a lead connecting the first direct current-direct current converter and the storage battery pack, and can be controlled to be switched off when the renewable resource power generation device is normal, so that the power generated by the renewable resource power generation device is used for supplying power to the power load, the service time and the strength of the storage battery pack can be reduced, and the storage battery pack can be protected.
And the third switch is closed when the utility power network and the storage battery combined renewable resource power generation device cannot work, and at the moment, the power generated by the internal combustion generator set can directly enter the alternating current bus through the third switch, so that the power load is used for continuously working.
As can be seen from the above technical solutions, the present embodiment provides a flexible uninterruptible power supply device including an ac bus, a dc bus, a first switch, a dc-ac converter, a storage battery pack, a first dc-dc converter, at least one second dc-dc converter, a second switch, and a third switch. One end of the first switch is used for connecting a mains supply network, and the other end of the first switch is connected with an alternating current bus; the input end of the DC-AC converter is electrically connected with the DC bus, and the output end of the DC-AC converter is electrically connected with the AC bus; the input end of the first direct current-direct current converter is electrically connected with the storage battery pack through a second switch, and the output end of the first direct current-direct current converter is electrically connected with the direct current bus; the input end of the second DC-DC converter is used for connecting the renewable resource power generation device, and the output end of the second DC-DC converter is electrically connected with the DC bus. One end of the third switch is electrically connected with the alternating current bus, and the other end of the third switch is electrically connected with the internal combustion engine power generation device. The storage battery pack supplies power to the power load through the direct current-alternating current converter only when the renewable resource power generation device cannot work normally, so that the service time and the strength of the storage battery pack are reduced, the purpose of protecting the storage battery pack is achieved, the service life of the storage battery pack is prolonged, and the use cost is effectively reduced.
In addition, renewable resources generally include wind energy and solar energy, and in view of this, the two renewable resource power generation devices, i.e., the photovoltaic power generation device and the wind energy power generation device, may be connected to the flexible uninterruptible power supply, and there are two corresponding second dc-dc converters, as shown in fig. 2, one of the second dc-dc converters is used to connect the photovoltaic power generation device 101 to the dc bus, and the other second dc-dc converter is used to connect the wind energy power generation device 102 to the dc bus.
In addition, the wind power generation device in fig. 2 is limited to a dc wind power generation device that generates dc power, and for an ac wind power generation device that directly generates ac power, the wind power generation device may be connected to an ac bus bar support to supply power to an electrical load, as shown in fig. 3.
Example two
Fig. 4 is a flowchart of a control method according to an embodiment of the present application.
As shown in fig. 4, the control method provided in this embodiment is applied to the flexible uninterruptible power supply apparatus shown in fig. 1, and the specific method includes the following steps:
and S1, acquiring the power supply state of the commercial power network.
The power supply state here includes normal power supply and abnormal power supply, where normal power supply means that the commercial power network can normally transmit electric energy to the flexible uninterruptible power supply in the previous embodiment, and abnormal power supply means that the commercial power network has a power failure and cannot supply power. The acquisition of the power supply state of the utility grid may be a detection of the voltage of the utility grid by a corresponding detection device, or an acquisition of power supply state information of a transformer or a substation located upstream of the utility grid via a data network.
And S2, switching the power supply of the alternating current bus when the power supply of the commercial power network is abnormal.
When the power supply of the commercial power network is abnormal, the first switch is firstly cut off, namely the alternating current bus is disconnected with the commercial power network. At the moment, the storage battery pack or the renewable resource power generation device is controlled to supply power to the direct current bus, or only the internal combustion generator set is controlled to supply power to the alternating current bus, so that electric energy is continuously obtained by using the electric load. Specifically, the above object is achieved by the following method.
When the running state of the renewable resource power generation device is normal, the first switch is controlled to be switched off, and the second direct current-direct current converter is controlled to work, so that the electric energy output by the renewable resource power generation device is transmitted to the direct current bus; namely, the electric energy generated by the renewable resource power generation device is only utilized to save fuel or reduce the service time of the storage battery.
When the running state of the renewable resource power generation device is abnormal, controlling the third switch to be closed so that the internal combustion power generation device transmits electric energy to the alternating current bus;
the second switch is controlled to be closed only when the operating state of the renewable resource power generation device and the operating state of the internal combustion power generation device are both abnormal, that is, the storage battery pack is used only under the condition that the power supply continuity to the electric load is maintained.
Through the control, the service time and the strength of the storage battery pack can be reduced, so that the purpose of protecting the storage battery pack is achieved, the service life of the storage battery pack is prolonged, and the use cost is effectively reduced.
EXAMPLE III
Fig. 5 is a flowchart of another control method according to an embodiment of the present application.
As shown in fig. 5, the control method provided in this embodiment is applied to the flexible uninterruptible power supply apparatus shown in fig. 1, and the specific method includes the following steps:
and S1, acquiring the power supply state of the commercial power network.
The power supply state here includes normal power supply and abnormal power supply, where normal power supply means that the commercial power network can normally transmit electric energy to the flexible uninterruptible power supply in the previous embodiment, and abnormal power supply means that the commercial power network has a power failure and cannot supply power. The acquisition of the power supply state of the utility grid may be a detection of the voltage of the utility grid by a corresponding detection device, or an acquisition of power supply state information of a transformer or a substation located upstream of the utility grid via a data network.
And S2, switching the power supply of the alternating current bus when the power supply of the commercial power network is abnormal.
When the power supply of the commercial power network is abnormal, the first switch is firstly cut off, namely the alternating current bus is disconnected with the commercial power network. At the moment, the storage battery pack or the renewable resource power generation device is controlled to supply power to the direct current bus, or only the internal combustion generator set is controlled to supply power to the alternating current bus, so that electric energy is continuously obtained by using the electric load. Specifically, the above object is achieved by the following method.
When the running state of the renewable resource power generation device is normal, the first switch is controlled to be switched off, and the second direct current-direct current converter is controlled to work, so that the electric energy output by the renewable resource power generation device is transmitted to the direct current bus; namely, the electric energy generated by the renewable resource power generation device is only utilized to save fuel or reduce the service time of the storage battery.
When the running state of the renewable resource power generation device is abnormal, controlling the third switch to be closed so that the internal combustion power generation device transmits electric energy to the alternating current bus;
the second switch is controlled to be closed only when the operating state of the renewable resource power generation device and the operating state of the internal combustion power generation device are both abnormal, that is, the storage battery pack is used only under the condition that the power supply continuity to the electric load is maintained.
Through the control, the service time and the strength of the storage battery pack can be reduced, so that the purpose of protecting the storage battery pack is achieved, the service life of the storage battery pack is prolonged, and the use cost is effectively reduced.
And S3, charging the storage battery pack by using the renewable resource power generation device when the commercial power network is normal.
When the mains supply network is normal, the mains supply network is used for supplying power to the electric load, and the first switch is closed;
in addition, the second switch is controlled to be closed, the second direct current-direct current converter is controlled to work, so that the generated energy of the renewable resource power generation device can continuously enter the direct current bus, the first direct current-direct current power generation device is controlled to reversely output at the moment, the electric energy on the direct current bus is charged into the storage battery pack, and therefore the storage battery pack can be charged by the generated energy of the free renewable resource power generation device, and cost is saved.
Example four
Fig. 6 is a block diagram of a control system according to an embodiment of the present application.
As shown in fig. 6, the control system provided in this embodiment is applied to the flexible uninterruptible power supply apparatus shown in fig. 1, and specifically includes a state detection module 70 and a switching control module 80.
The state detection module is used for acquiring the power supply state of the commercial power network.
The power supply state here includes normal power supply and abnormal power supply, where normal power supply means that the commercial power network can normally transmit electric energy to the flexible uninterruptible power supply in the previous embodiment, and abnormal power supply means that the commercial power network has a power failure and cannot supply power. The module may detect the voltage of the utility grid through a corresponding detection device, or acquire power supply status information of a transformer or a substation located upstream of the utility grid through a data network.
The switching control module is used for switching the power supply of the alternating current bus when the power supply of the commercial power network is abnormal.
When the power supply of the commercial power network is abnormal, the first switch is firstly cut off, namely the alternating current bus is disconnected with the commercial power network. At the moment, the storage battery pack or the renewable resource power generation device is controlled to supply power to the direct current bus, or only the internal combustion generator set is controlled to supply power to the alternating current bus, so that electric energy is continuously obtained by using the electric load. Specifically, the module includes a first control unit, a second control unit, and a third control unit.
The first control unit is used for controlling the first switch to be switched off and controlling the second direct current-direct current converter to work when the running state of the renewable resource power generation device is normal, so that the electric energy output by the renewable resource power generation device is transmitted to the direct current bus; namely, the electric energy generated by the renewable resource power generation device is only utilized to save fuel or reduce the service time of the storage battery.
The second control unit is used for controlling the third switch to be closed when the running state of the renewable resource power generation device is abnormal, so that the internal combustion power generation device transmits electric energy to the alternating current bus;
the third control unit is used for controlling the second switch to be closed only when the running state of the renewable resource power generation device and the running state of the internal combustion power generation device are abnormal, namely, the storage battery pack is used only under the condition that the power supply continuity to the electric load is maintained.
Through the control of the module, the service time and the strength of the storage battery pack can be reduced, so that the purpose of protecting the storage battery pack is achieved, the service life of the storage battery pack is prolonged, and the use cost is effectively reduced.
EXAMPLE five
Fig. 7 is a block diagram of another control system according to an embodiment of the present application.
As shown in fig. 7, the control system provided in this embodiment is additionally provided with a charging control module 90 in addition to the above embodiment.
And the charging control module is used for charging the storage battery pack by utilizing the renewable resource power generation device when the commercial power network is normal.
When the mains supply network is normal, the mains supply network is used for supplying power to the electric load, and the first switch is closed;
in addition, the module includes a fourth control unit and a fifth control unit. The fourth control unit is used for controlling the second switch to be closed, the fifth control unit is used for controlling the second direct current-direct current converter to work, so that the generated energy of the renewable resource power generation device can continuously enter the direct current bus, the first direct current-direct current power generation device is controlled to reversely output at the moment, the electric energy on the direct current bus is charged into the storage battery pack, and therefore the storage battery pack can be charged by the generated energy of the free renewable resource power generation device, and cost is saved.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one of skill in the art, embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The technical solutions provided by the present application are introduced in detail, and specific examples are applied in the description to explain the principles and embodiments of the present application, and the descriptions of the above examples are only used to help understanding the method and the core ideas of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A flexible uninterruptible power supply apparatus comprising an ac bus, a dc bus, a first switch, a dc-to-ac converter, a battery pack, a first dc-to-dc converter, at least one second dc-to-dc converter, a second switch, and a third switch, wherein:
the alternating current bus is used for outputting electric energy to an electric load;
one end of the first switch is used for connecting a mains supply network, and the other end of the first switch is connected with the alternating current bus and is configured to be closed when the mains supply network supplies power normally and be opened when the power supply is abnormal;
the input end of the DC-AC converter is electrically connected with the DC bus, the output end of the DC-AC converter is electrically connected with the AC bus, and the DC-AC converter is configured to utilize the DC voltage of the DC bus to output AC electric energy to the AC bus when the power supply of the commercial power network is abnormal, and stop working when the power supply of the commercial power network is normal;
the input end of the first direct current-direct current converter is electrically connected with the storage battery pack, and the output end of the first direct current-direct current converter is electrically connected with the direct current bus;
the input end of the second DC-DC converter is used for connecting a renewable resource power generation device, and the output end of the second DC-DC converter is electrically connected with the DC bus;
the second switch is arranged on a lead for connecting the first direct current-direct current converter and the storage battery pack, is configured to be opened when the mains network supplies power normally, is also configured to be closed when the mains network supplies power abnormally and the renewable resource power generation device supplies power to the direct current bus abnormally, and is also configured to be opened when the mains network supplies power abnormally and the renewable resource power generation device supplies power to the direct current bus normally;
and one end of the third switch is electrically connected with the alternating current bus, and the other end of the third switch is electrically connected with the internal combustion engine power generation device and is configured to be conducted when the power supply of the commercial power network and the renewable resource power generation device are abnormally operated.
2. The flexible uninterruptible power supply device of claim 1, wherein the second dc-dc converters are two, wherein:
the output end of the second direct current-direct current converter is electrically connected with the direct current bus, and the other end of the second direct current-direct current converter is electrically connected with the solar power generation device;
the output end of the other second direct current-direct current converter is electrically connected with the direct current bus, and the other end of the other second direct current-direct current converter is electrically connected with the wind power direct current power generation device.
3. A control method applied to the flexible uninterruptible power supply device according to claim 1, wherein the control method includes:
acquiring the power supply state of the commercial power network;
and when the power supply of the commercial power network is abnormal, controlling the storage battery pack, the renewable resource power generation device or the internal combustion generator set to supply power to the power load.
4. The control method according to claim 3, wherein said controlling the battery pack, the renewable resource power generation device, or the internal combustion generator set to supply power to the electrical load according to the operating state includes:
when the running state of the renewable resource power generation device is normal, controlling the first switch to be switched off, and controlling the second direct current-direct current converter to work, so that the electric energy output by the renewable resource power generation device is transmitted to the direct current bus;
when the running state of the renewable resource power generation device is abnormal, controlling the third switch to be closed so that the internal combustion power generation device transmits electric energy to the alternating current bus;
and when the running state of the renewable resource power generation device and the running state of the internal combustion power generation device are both abnormal, controlling the second switch to be closed.
5. The control method according to claim 3, further comprising:
and when the power supply of the commercial power network is normal, controlling the renewable resource power generation device to charge the storage battery pack.
6. The control method of claim 5, wherein said controlling said renewable resource power generation device to charge said battery pack comprises:
controlling the second switch to close;
and controlling the first direct current-direct current conversion device to obtain electric energy from the direct current bus and output the electric energy to the storage battery pack.
7. A control system applied to the flexible uninterruptible power supply device according to claim 1, wherein the control system includes:
the state detection module is used for detecting the power supply state of the commercial power network;
and the switching control module is used for controlling the storage battery pack, the renewable resource power generation device or the internal combustion generator set to supply power to the power load when the power supply of the commercial power network is abnormal.
8. The control system of claim 7, wherein the switching control system comprises:
the first control unit is used for controlling the first switch to be switched off and controlling the second direct current-direct current converter to work when the running state of the renewable resource power generation device is normal, so that the electric energy output by the renewable resource power generation device is transmitted to the direct current bus;
the second control unit is used for controlling the third switch to be closed when the running state of the renewable resource power generation device is abnormal, so that the internal combustion power generation device can transmit electric energy to the alternating current bus;
and the third control unit is used for controlling the second switch to be closed when the running state of the renewable resource power generation device and the running state of the internal combustion power generation device are both abnormal.
9. The control system of claim 7, further comprising:
and the charging control module is used for controlling the renewable resource power generation device to charge the storage battery pack when the power supply of the commercial power network is normal.
10. The control system of claim 9, wherein the charge control module comprises:
the fourth control unit is used for controlling the second switch to be closed;
and the fifth control unit is used for controlling the first direct current-direct current conversion device to obtain electric energy from the direct current bus and output the electric energy to the storage battery pack.
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| CN201811457408.6A CN111262336A (en) | 2018-11-30 | 2018-11-30 | Flexible uninterruptible power supply device and control method and system thereof |
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| CN201811457408.6A CN111262336A (en) | 2018-11-30 | 2018-11-30 | Flexible uninterruptible power supply device and control method and system thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111948991A (en) * | 2020-07-21 | 2020-11-17 | 浙江中新电力工程建设有限公司 | Optimization control system and method based on comprehensive energy service system |
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| CN104600807A (en) * | 2015-02-02 | 2015-05-06 | 北京四方继保自动化股份有限公司 | Electric vehicle charging station system based on AC/DC double bus |
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