CN114448072A - Direct-current building power supply system and operation method thereof - Google Patents
Direct-current building power supply system and operation method thereof Download PDFInfo
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- CN114448072A CN114448072A CN202210104762.0A CN202210104762A CN114448072A CN 114448072 A CN114448072 A CN 114448072A CN 202210104762 A CN202210104762 A CN 202210104762A CN 114448072 A CN114448072 A CN 114448072A
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
- H02J13/00026—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission involving a local wireless network, e.g. Wi-Fi, ZigBee or Bluetooth
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- 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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- 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
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Human Computer Interaction (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a direct current building power supply system and an operation method thereof, wherein the direct current building power supply system comprises the following steps: a plurality of users; a plurality of photovoltaic power generation devices; a high frequency switching power supply; each photovoltaic power generation device corresponds to one storage battery pack and is electrically connected with the high-frequency switching power supply; the photovoltaic power generation device supplies power to a user and/or charges a storage battery pack; the intelligent controller is respectively and electrically connected with the photovoltaic power generation device, the high-frequency switching power supply and the storage battery pack; the information acquisition modules are electrically connected with the intelligent controller; the commercial power output end is electrically connected with the high-frequency switching power supply, and the commercial power input end is electrically connected with the photovoltaic power generation device; the power supply side bus is electrically connected with the photovoltaic power generation device, the high-frequency switching power supply and the storage battery pack respectively; and the shared bus is electrically connected with the power supply side bus and the plurality of users respectively and is used for providing direct current for the users. The method and the device have the advantages that the energy conservation, emission reduction and safe power supply are realized by providing the direct current power supply mode for the user.
Description
Technical Field
The invention relates to the technical field of power generation, in particular to a direct-current building power supply system and an operation method thereof.
Background
The existing building power supply system mostly adopts an alternating current power supply for power supply, a great amount of renewable energy sources are inevitably used to enter a distribution network, particularly, the technology of photovoltaic energy sources is rapidly advanced and iterated, the renewable energy sources become clean energy sources which are affordable and usable by people, and meanwhile, the scale application of the distributed photovoltaic system is also in line with unprecedented opportunity.
The volatility and randomness of renewable energy sources are inconsistent with the electricity utilization rule of buildings for a long time, the renewable energy sources are one of the bottlenecks of large-scale application of the renewable energy sources, along with the rapid development of power technology, various electricity utilization equipment in the buildings are gradually converted into alternating-current and direct-current dual-purpose equipment, and IT equipment such as LED lighting equipment, computers, displays and the like become universal for alternating-current 220v power supply and direct-current 240v power supply; white household appliances such as air conditioners, refrigerators and the like are rapidly developed in the direction of frequency conversion, and high-power equipment in buildings such as elevators, water pumps, fans and the like is also a direct-current driven frequency conversion device in the current development direction; therefore, there is a need to provide a design scheme for providing stable dc power supply to a building power supply system by using renewable energy.
Disclosure of Invention
In view of the above, the present invention provides a dc building power supply system and an operation method thereof, wherein a dc power supply mode is provided for a user to supply power, so as to realize an energy saving, emission reduction and safe power supply mode.
The application provides a direct current building power supply system includes:
a plurality of users;
a plurality of photovoltaic power generation devices, each photovoltaic power generation device being operable to supply power to a plurality of users;
the high-frequency switching power supply comprises an input end and an output end and is used for stabilizing the voltage of the direct current power supply system;
each photovoltaic power generation device corresponds to one storage battery pack, and the storage battery packs are electrically connected with the output end of the high-frequency switching power supply; the photovoltaic power generation device supplies power to a user and/or charges a storage battery pack;
the intelligent controller comprises an input end and an output end, is respectively and electrically connected with the photovoltaic power generation device, the high-frequency switching power supply and the storage battery pack and is used for controlling charging and discharging of the direct-current power supply system in different time periods;
the information acquisition modules are respectively arranged in the electric connection lines, are electrically connected with the intelligent controller and are used for feeding back information to the intelligent controller;
the commercial power comprises a commercial power output end and a commercial power input end, the commercial power output end is electrically connected with the input end of the high-frequency switching power supply, and the commercial power input end is electrically connected with the output end of the photovoltaic power generation device;
the power supply side bus is electrically connected with the photovoltaic power generation device, the high-frequency switching power supply and the storage battery pack respectively;
and the shared bus is electrically connected with the power supply side bus and the plurality of users respectively and is used for providing direct current for the users.
Optionally, the method further comprises: and the meteorological information acquisition module is electrically connected with the intelligent controller and is used for acquiring meteorological information.
Optionally, the method further comprises: and the wireless communication module is electrically connected with the intelligent controller and is used for realizing wireless control of the direct current power supply system.
Optionally, the method further comprises: and the lightning protection device is arranged at the joint of each electrical connection circuit.
Optionally, the standard voltage supplied by the dc power supply system is 240 v.
The application also provides an operation method of the direct-current building power supply system, which comprises a first environment, a second environment and a third environment, wherein the illumination intensity in the first environment, the second environment and the third environment is weakened in sequence;
in a first environment, the photovoltaic power generation device normally generates power, the generated energy of the photovoltaic power generation device is sufficient, and the photovoltaic power generation device supplies power to a user; the intelligent controller judges whether the storage battery needs to be charged or not according to the energy storage condition of the storage battery pack; if the storage battery pack has an energy storage space, the intelligent controller controls the photovoltaic power generation device to charge the storage battery pack; if the storage battery pack has no energy storage space, the intelligent controller controls the photovoltaic power generation device to stop charging the storage battery pack, and part of electric quantity of the photovoltaic power generation device is input into the shared charging grid to charge other storage battery packs, or; the intelligent controller controls the photovoltaic power generation device to transmit electric energy to a power grid;
in a second environment, the intelligent controller receives the power generation condition of the photovoltaic power generation device in real time through the information acquisition module; if the photovoltaic power generation device is not enough to provide electric energy for users due to insufficient illumination intensity, the high-frequency switching power supply is started, and the commercial power supplies power for supplement; if the photovoltaic power generation device is enough to provide the electric energy for the user, supplying power to the user by the photovoltaic power generation device;
in a third environment, the intelligent controller controls the high-frequency switching power supply, and mains supply supplies power to users; and if the commercial power is at a high power consumption peak, the intelligent controller controls the storage battery pack to supply power additionally.
Optionally, if the power consumption peak of the user is in, the intelligent controller further controls the storage battery pack to supply power additionally after:
after the storage battery pack discharges, the intelligent controller controls the photovoltaic power generation device to charge the storage battery according to the environmental information collected by the meteorological information collection module; if the environment information acquired by the weather information acquisition module is judged to be the first environment, the storage battery pack does not need to be charged; and if the environment information acquired by the weather information acquisition module is judged to be the third environment, the storage battery pack needs to be charged.
Optionally, the dc power supply system includes a wireless communication module, and the wireless communication module receives or executes a command of the intelligent controller according to the information acquired by the information acquisition module.
Optionally, when the illumination intensity is continuously insufficient, the intelligent controller performs valley power charging, peak power discharging and flat power rectification system direct current direct supply.
Compared with the prior art, the direct-current building power supply system and the operation method thereof provided by the invention at least realize the following beneficial effects:
according to the direct-current building power supply system and the operation method thereof, the storage battery is introduced, the asynchronism of the photovoltaic power generation device and the building power utilization is coordinated, the contradiction between supply and demand is balanced, and the cost for improving the reliability of a power grid on the supply side can be fully relieved; in addition, the power supply is converted from centralized type to distributed type, the power grid is converted from the current unidirectional power receiving to bidirectional active power, and the power supply and demand relationship is converted from the current 'source changes with load' to 'load changes with source'; the stability of the power grid is changed from relying on the inertia of a centralized power supply to relying on distributed power storage, a high-frequency switching power supply is introduced, a direct-current power supply mode is provided for a user to supply power, and the modes of energy conservation, emission reduction and safe power supply are realized.
Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic structural diagram of a power supply system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a power supply system according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another power supply system according to an embodiment of the present application.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
The following detailed description is to be read in connection with the drawings and the detailed description.
Fig. 1 is a schematic structural diagram of a power supply system according to an embodiment of the present application, please refer to fig. 1, wherein a dc building power supply system 100 according to the present application includes:
a plurality of users n;
a plurality of photovoltaic power generation apparatuses 10, each photovoltaic power generation apparatus 10 being capable of supplying power to a plurality of users n;
the high-frequency switching power supply 20, the high-frequency switching power supply 20 includes input end and carry-out terminal, is used for stabilizing the voltage of the direct current power supply system;
the photovoltaic power generation device comprises a plurality of storage battery packs 30, wherein each photovoltaic power generation device 10 corresponds to one storage battery pack 30, and the storage battery packs 30 are electrically connected with the output end of the high-frequency switching power supply 20; wherein, the photovoltaic power generation device 10 supplies power to a user n and/or charges the storage battery pack 30;
the intelligent controller 40 comprises an input end and an output end, and the intelligent controller 40 is respectively and electrically connected with the photovoltaic power generation device 10, the high-frequency switching power supply 20 and the storage battery pack 30 and is used for controlling charging and discharging of the direct-current power supply system in different time periods;
the information acquisition modules 50 are respectively arranged in each electric connection circuit, can reflect the current flow direction, the charge and discharge state and the real-time capacity state of the storage battery in real time and feed back information to the intelligent controller 40 in time;
the commercial power 60 comprises a commercial power output end and a commercial power input end, wherein the commercial power output end is electrically connected with the input end of the high-frequency switching power supply 20, and the commercial power input end is electrically connected with the output end of the photovoltaic power generation device;
a power supply side bus 70 electrically connected to the photovoltaic power generation apparatus 10, the high-frequency switching power supply 20, and the battery pack 30, respectively;
and a shared bus 80 electrically connected to the power supply side bus 70 and the plurality of subscribers n, respectively, for supplying dc power to the subscribers n.
Specifically, the power supply system 100 provided in the present embodiment can be applied to a building power supply system; in the power supply system provided by the embodiment, the power supply is converted from centralized type to centralized type and is combined with distributed type; the power grid is converted from the current unidirectional power receiving into the bidirectional active power source; the power supply and demand relationship is changed from the current 'source changes along with load' to 'load changes along with source'; the stability of the power grid is shifted from relying on the inertia of the centralized power supply to relying on distributed power storage.
Further, the power supply system in the present embodiment serves a plurality of users n, and the photovoltaic power generation apparatus 10 is provided in units of each user n or in units of every several users n; each photovoltaic power generation device 10 is correspondingly provided with one storage battery pack 30, when the electric energy generated by the photovoltaic power generation device 10 is sufficient and overflows, the redundant electric energy is stored in the corresponding storage battery pack 30, and the redundant electric energy can also be stored in other storage battery packs 30, wherein the storage battery packs 30 can also supply power to a user n under the condition of bad weather; a high-frequency switching power supply 20 is further provided in this embodiment, and optionally, the high-frequency switching power supply is input from an Alternating Current (AC) power grid and output from a Direct Current (DC) power grid according to the requirement of a load to provide a stable and reliable DC power supply, on one hand, the high-frequency switching power supply 20 is used for supplying power to a user; on the other hand, the high-frequency switching power supply 20 is used to charge the secondary battery pack 30; in this embodiment, both the high-frequency switching power supply 20 and the photovoltaic power generation device 10 are electrically connected to the utility power 60, the utility power output end is electrically connected to the input end of the high-frequency switching power supply 20, and the utility power input end is electrically connected to the output end of the photovoltaic power generation device, so that on one hand, when sunlight is insufficient, the alternating current of the utility power 60 is converted into direct current to be supplied to a user n, and on the other hand, when the sunlight is sufficient, the photovoltaic power generation device 10 can also provide redundant electric energy to the utility power 60; in this embodiment, the photovoltaic power generation apparatus 10, the high-frequency switching power supply 20, and the storage battery 30 are all electrically connected to the power supply side bus 70 and supply power to the power supply side bus 70, the power supply side bus 70 is electrically connected to the shared bus 80 and supplies power to the shared bus 80, and the shared bus 80 is electrically connected to a plurality of users n and supplies direct current to the users n; in this embodiment, an intelligent controller 40 and an information acquisition module 50 are further provided, the information acquisition module 50 is respectively disposed in each electrical connection line, and is electrically connected to the intelligent controller 40, for feeding back information to the intelligent controller 40, the intelligent controller 40 is electrically connected to the photovoltaic power generation apparatus 10, the high-frequency switching power supply 20, and the storage battery pack 30, respectively, and controls charging and discharging of the dc power supply system in time-sharing manner according to the information acquired by the information acquisition module 50; therefore, by introducing the storage battery pack 30, the asynchronism between the photovoltaic power generation device 10 and the building electricity is coordinated, the contradiction between supply and demand is balanced, and the cost for improving the reliability of the power grid on the supply side can be fully relieved; in addition, the power supply is converted from centralized type to distributed type, the power grid is converted from the current unidirectional power receiving to bidirectional active power, and the power supply and demand relationship is converted from the current 'source changes with load' to 'load changes with source'; the stability of the power grid is changed from relying on the inertia of a centralized power supply to relying on distributed power storage, a high-frequency switching power supply 20 is introduced, and a direct-current power supply mode is provided for the user n to supply power, so that the modes of energy conservation, emission reduction and safe power supply are realized.
The intelligent controller 40 in the present embodiment is an integrated device that integrates processor, memory, sensor information processing, and actuator signal generation. Wherein, the processor in the controller can adopt a PID processor, the memory adopts conventional memory equipment, and the sensor is used for sensing the current signal in the circuit. It should be further noted that the information collecting module 50 in this embodiment may be a current collecting module.
It should be further noted that the controller in the present application is only used to implement signal transmission, and the controller is formed by using a processor, a memory and a sensor in the prior art, and does not relate to the improvement of the control method of the controller. In an optional embodiment of the present application, further comprising: the weather information acquisition module 110, the weather information acquisition module 110 is electrically connected with the intelligent controller 40, and is used for acquiring weather information, predicting the ultraviolet index of each hour of the day in advance, indirectly reflecting the sunlight index, and converting the information into a standard signal which can be recognized by the intelligent controller.
Specifically, the power supply system further includes a weather information collection module 110 in this embodiment, the weather information collection module 110 is electrically connected to the intelligent controller 40, the weather information collection module 110 can collect weather information, that is, the illumination intensity, and the intelligent controller 40 further controls the photovoltaic power generation apparatus 10, the storage battery pack 30 or the utility power 60 in the power supply system to supply power to the user n according to the illumination intensity, so that the power supply system supplies power to the user n by using different modules according to different weather conditions.
It should be noted that the meteorological information acquisition module 50 in this embodiment may be a grid-connected photovoltaic power generation environment monitoring system, the model may be DC-91, and may monitor indexes such as ambient temperature, wind speed and wind direction, air pressure, sunshine hours, total solar radiation, direct solar radiation, scattered solar radiation, and photovoltaic module temperature, and has the advantages of stable performance, high monitoring accuracy, and the like; optionally, the weather information collection module 50 operates at an ambient temperature of-30 ° to-70 °.
In an optional embodiment of the present application, further comprising: the wireless communication module 120, the wireless communication module 120 and the field controller and the intelligent controller 40 are in real-time wireless communication, and are also used for realizing remote monitoring of the direct current power supply system.
Specifically, the present embodiment further includes a wireless communication module 120, the wireless communication module 120 is electrically connected to the intelligent controller 40, and the wireless communication module 120 has a communication function, an application function, and a remote management function, that is, supports GPRS and short message dual-channel data transmission, and supports multi-node data communication; collecting serial equipment data such as a serial instrument, a collector, a PLC and the like; remote parameter setting and program upgrading are supported; therefore, a wireless data transmission mode is realized, the power supply system can realize wider adaptability, and the remote monitoring is not limited by the geographic environment.
In an optional embodiment of the present application, further comprising: and the lightning protection device is arranged at the joint of each electrical connection circuit.
Specifically, a lightning protection device is further introduced in this embodiment, where the lightning protection device is a sum of a lightning receptor, a down conductor, a grounding device, a Surge Protector (SPD), and other connecting conductors, and the lightning protection device is disposed at a connection point of each electrical connection line, optionally, the lightning protection device is disposed in a line where a power supply side bus is electrically connected to a shared bus, or in a line where a commercial power output end is electrically connected to an input end of a high-frequency switching power supply, and the application is not limited herein; can effectually prevent that power supply system from suffering the destruction of environment through setting up lightning protection device.
In an alternative embodiment of the present application, the standard voltage of the dc power supply system is 240V.
Specifically, the standard voltage of the power supply system in this embodiment is 240V ac, and with the rapid development of power electronics technology, various electric devices in a building are gradually converted into ac/dc dual-purpose devices, such as IT devices, e.g., LED lighting devices, computers and displays, communication devices, multimedia devices, and the like, which have become common for ac 220V power supply and dc 240V power supply; white household appliances such as air conditioners, refrigerators and the like are rapidly developed in the direction of frequency conversion, high-power equipment in buildings such as elevators, water pumps, fans and the like is also a direct-current-driven frequency conversion device in the current development direction, and a power supply system in the embodiment provides powerful support for a power terminal to supply direct current.
Based on the same inventive concept, fig. 2 is another schematic structural diagram of a dc building power supply system provided in an embodiment of the present application, please refer to fig. 2 in combination with fig. 1, and the present application further provides an operation method of a distributed dc power supply system, including a first environment, a second environment, and a third environment, where illumination intensities in the first environment, the second environment, and the third environment are sequentially weakened;
in a first environment, the photovoltaic power generation device 10 normally generates power, the power generation amount of the photovoltaic power generation device 10 is sufficient, and the photovoltaic power generation device 10 supplies power to a user n; the intelligent controller 40 judges whether the storage battery needs to be charged according to the energy storage condition of the storage battery pack 30; if the storage battery pack 30 has an energy storage space, the intelligent controller 40 controls the photovoltaic power generation device 10 to charge the storage battery pack 30; if the storage battery pack 30 has no energy storage space, the intelligent controller 40 controls the photovoltaic power generation device 10 to stop charging the storage battery pack 30, and part of the electric quantity of the photovoltaic power generation device 10 is input into the shared charging grid to charge other storage battery packs 30, or; the intelligent controller 40 controls the photovoltaic power generation device 10 to transmit electric energy to the power grid;
in a second environment, the intelligent controller 40 receives the power generation condition of the photovoltaic power generation device 10 in real time through the information acquisition module 50; if the photovoltaic power generation device 10 is not enough to provide electric energy for the user n due to the illumination intensity and the power grid is in the off-peak power period, starting the high-frequency switching power supply 20 and supplying power by the commercial power 60; if the photovoltaic power generation device 10 is enough to provide the electric energy for the user n, the photovoltaic power generation device 10 supplies power for the user n;
in a third environment, the intelligent controller 40 instructs the high-frequency switching power supply 20 to supply power to the user n from the mains 60; if the commercial power 60 is in a power utilization peak period, the intelligent controller 40 controls the storage battery pack 30 to supply power.
Specifically, the operation method of the dc building power supply system provided in this embodiment operates in a first environment, a second environment, and a third environment, respectively, and in different environments, power supplies of the power supply system are different; the power supply system in this embodiment adopts different power supply sources according to the illumination intensity.
Furthermore, a cell is taken as a node, one or more sets of switching power supply systems are installed in a distribution room of the original cell, and the direct-current power is calculated according to the existing alternating-current power; or the building is taken as a node, and an outdoor container type direct current distribution room is arranged near the building; or the single villa area is taken as a node, and an outdoor comprehensive container cabinet is arranged near the villa area; at least one set of switching power supply system provided by the application is installed at each node, the system adopts an IT network form, positive and negative systems are not grounded, the original power supply line of a community distribution room is utilized, L is connected with a positive pole, N is connected with a negative pole, a protective ground wire is kept still in an original distribution box of a user N, and an indoor socket of the user N and a plug of electric equipment of a building are changed into a trapezoidal structure, so that the situation that the positive pole and the negative pole cannot be inserted reversely is ensured; optionally, in order to reduce the reconstruction of indoor circuits, the original 5-hole socket needs to be changed into a 3-hole socket, and an electric appliance two-core plug needs to be changed into a three-core plug.
In a first environment, the illumination intensity is high, the photovoltaic power generation device 10 normally generates power, the power generation amount of the photovoltaic power generation device 10 is sufficient, and the photovoltaic power generation device 10 supplies power to the user n; at this time, the intelligent controller 40 determines whether the storage battery needs to be charged according to the energy storage condition of the storage battery pack 30; if the storage battery pack 30 has an energy storage space, the intelligent controller 40 controls the photovoltaic power generation device 10 to charge the storage battery pack 30; if the storage battery pack 30 has no energy storage space, the intelligent controller 40 controls the photovoltaic power generation device 10 to stop charging the storage battery pack 30, namely, turns off the switch KA, inputs part of the electric quantity of the photovoltaic power generation device 10 into the shared charging grid, turns on the switch KC to charge other storage battery packs 30, turns on the switch KB, and turns off the switches KA, KB and KC or else if other storage battery packs are fully charged; the intelligent controller 40 controls the photovoltaic power generation device 10 to deliver electric energy to the grid, i.e. opens the switch KD.
In a second environment, the illumination intensity is insufficient, and the intelligent controller 40 receives the power generation condition of the photovoltaic power generation device 10 in real time through the information acquisition module 50; if the photovoltaic power generation device 10 is not enough to provide electric energy for the user n due to weather reasons, the high-frequency switching power supply 20 is started, the commercial power 60 supplies power, and if the commercial power 60 is in a power utilization peak period, the storage battery pack 30 supplies power to the user n; if the photovoltaic power generation apparatus 10 is sufficient to supply the electric power to the user n, the photovoltaic power generation apparatus 10 supplies the electric power to the user n.
In a third environment, the illumination intensity is weak, the intelligent controller 40 controls the high-frequency switching power supply 20, and the commercial power 60 supplies power to the user n; if the commercial power 60 is in a power utilization peak time period, the intelligent controller 40 controls the storage battery pack 30 to supply power; if the commercial power is in the flat power period or the valley power period, the intelligent controller 40 controls the high-frequency switching power supply to supply power independently.
In the different environments, different modules in the power supply system are selected to supply power to the user n according to the illumination intensity, so that the reliability of the power supply system can be effectively ensured.
It should be noted that the photovoltaic power generation apparatus 10 installed in a distributed manner is also equipped with a bidirectional dc power meter.
It should be further noted that, the high-frequency switching power supply in this embodiment is also electrically connected to the emergency generator, and when the power grid is disconnected, that is, the power grid is powered off, and the illumination intensity is seriously insufficient, the power can be supplied to the user through the emergency generator and the high-frequency switching power supply.
In an alternative embodiment of the present application, if the power consumption of the user n is high, the controlling of the intelligent controller 40 to supplement the power supply by the battery pack 30 further includes:
after the storage battery pack 30 discharges, the intelligent controller 40 controls the photovoltaic power generation device 10 to charge the storage battery according to the environmental information collected by the meteorological information collection module 110; if the environment information collected by the weather information collection module 110 is judged to be the first environment, the storage battery pack 30 does not need to be charged; if it is determined as the third environment according to the environmental information collected by the weather information collection module 110, the storage battery pack 30 needs to be charged.
Specifically, in the present embodiment, after the storage battery pack 30 is discharged, it is necessary to determine whether the storage battery pack 30 needs to be charged according to the weather information, that is, according to the magnitude of the illumination intensity, so as to prepare for the need from time to time; if the light intensity is weak recently, the intelligent controller 40 sends an instruction to the high-frequency switching power supply 20, and the high-frequency switching power supply 20 is started to charge the storage battery pack 30 at the valley period of the mains supply 60, so that the reliable power supply of the power supply system is ensured.
In an alternative embodiment of the present application, the dc power supply system includes a wireless communication module 120, and the wireless communication module 120 receives or executes a command of the intelligent controller 40 according to the information collected by the information collecting module 50.
Specifically, in the present embodiment, in the node range, a plurality of sets of distributed photovoltaic power generation apparatuses 10 and storage battery packs 30 are installed, and an intelligent controller 40 with a wireless function is installed, that is, a wireless communication module 120 is further provided, and the intelligent controller 40 preprocesses acquired information, and then receives and executes a command of the intelligent controller 40 through wireless network and communication; in addition, when the communication is interrupted, the intelligent controller 40 can process itself, ensure the safety of the battery pack 30, and save data.
In an alternative embodiment of the present application, when the illumination intensity is continuously insufficient, the intelligent controller 40 will run off-peak charging, off-peak discharging, flat rectifier system dc direct supply.
Specifically, in the present embodiment, when the illumination intensity is continuously weak, i.e., in a continuous rainy day, the intelligent controller 40 operates the way of valley power charging, peak power discharging, and dc direct supply of the flat rectifier system; therefore, the reliable operation of the power supply system can be effectively ensured.
In an alternative embodiment of the present application, fig. 3 is a schematic diagram of another structure of the distributed dc power supply system provided in the embodiment of the present application, please refer to fig. 2, which is described by taking a villa as an example, the villa includes 180 residents, the peak value of the electric demand of the users is 15KW, the usage factor is calculated according to 0.85, and the total peak power consumption is 180 × 15KW × 0.85 — 2295 KW; the villa is provided with a 10KV power distribution room, two 2000KVA power transformers 140, and the power transformers are respectively supplied with power in columns at ordinary times, optionally, as shown in figure 3, each column of power supply can be divided into two paths of power supply, each path of power supply can comprise a plurality of users, each path of power supply is provided with an alternating current power distribution switch and a high-frequency rectifier, and the high-frequency rectifier and the alternating current power distribution switch can provide direct current power for each user in each path; in the embodiment shown in fig. 3, only the ac distribution switches and the high-frequency rectifiers corresponding to one path of users are illustrated, the ac distribution switches and the high-frequency rectifiers for the remaining paths of users are only illustrated in the form of a block, and the connection between the ac distribution switches and the high-frequency rectifiers for the remaining paths of users can refer to the form illustrated in fig. 3; optionally, when the distribution room is overhauled, a switch connected between the two transformers is opened through 400V bus connection, power is supplied by one transformer 140, the 400V distribution is divided into 4 low-voltage screens, and each screen supplies 45 households; on average, 10KW photovoltaic cell panels can be mounted on the roof of each household, 5KW photovoltaic cell panels can be mounted on the side, facing the sun, of the vertical wall surface, and the total number of the photovoltaic cell panels is 15KW for each household; each household is provided with a 30KW lithium iron phosphate storage battery or a lead-carbon storage battery; a high-frequency switching power supply is installed beside an alternating current screen, the capacity configuration is determined according to a 45-user storage battery pack 30, and the configuration is completed after the charging is completed in 8 hours at the valley power; the detailed calculation process is as follows: 30000W × 45 ÷ 240V ÷ 8 ÷ 703A, each actually configured switching power supply module is 50A, 20 blocks in total are provided, and the total capacity is 240V/1000A; and on site, the photovoltaic power generation device is controlled by the intelligent controller to supply power to the user n, and the residual energy is stored, or the photovoltaic power generation device transmits power to the power grid through the inverter.
In the embodiment, the alternating current distribution and the high-frequency switching power supply are controlled by the system controller, when no solar energy exists in a cloudy day continuously and the illumination intensity is seriously insufficient, the system controller controls the high-frequency switching power supply to store energy in a valley power period, if the stored energy cannot meet the use requirement of a user, the system controller adopts the direct supply of the high-frequency switching power supply in a partial flat power period through accurate calculation, and supplies power to each user through a system direct current bus to make up the problem that the stored energy cannot meet the practical use requirement; when the sunlight is sufficient, the illumination intensity is sufficient, and the power needs to be transmitted to a power grid, the field intelligent controller is controlled to act in a wireless mode, so that the KG, the ATS2 and the ATS1 act simultaneously, the power is transmitted to the power grid through the commercial power bus and the AC screen, the power is supplied to users, meanwhile, partial electric energy can be recycled, and the reliability of a power supply system is ensured; the system controller is used for controlling the whole villa area, the field intelligent controller is used for controlling the field, the field condition is complex, the running state of each photovoltaic power generation device and the load change of a user are different, so that the field intelligent controller is needed, the system controller is used for comprehensively judging according to the field condition, and then whether the high-frequency switching power supply is switched on or not and whether the ATS switch is switched on or not are selected.
In summary, the distributed dc power supply system and the operation method thereof provided by the present invention at least achieve the following beneficial effects:
according to the distributed direct-current power supply system and the operation method thereof, the storage battery is introduced, the asynchronism of the photovoltaic power generation device and the electricity consumption of a building is coordinated, the contradiction between supply and demand is balanced, and the cost for improving the reliability of a power grid on a supply side can be fully relieved; in addition, the power supply is converted from centralized type to distributed type, the power grid is converted from the current unidirectional power receiving to bidirectional active power, and the power supply and demand relationship is converted from the current 'source changes with load' to 'load changes with source'; the stability of the power grid is changed from relying on the inertia of a centralized power supply to relying on distributed power storage, a high-frequency switching power supply is introduced, a direct-current power supply mode is provided for a user to supply power, and the modes of energy conservation, emission reduction and safe power supply are realized.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (9)
1. A direct current building power supply system, comprising:
a plurality of users;
a plurality of photovoltaic power generation devices, each of which can supply power to a plurality of the users;
the high-frequency switching power supply comprises an input end and an output end and is used for stabilizing the voltage of a direct current power supply system;
each photovoltaic power generation device corresponds to one storage battery pack, and the storage battery packs are electrically connected with the output end of the high-frequency switching power supply; wherein the photovoltaic power generation device supplies power to the user and/or charges the storage battery pack;
the intelligent controller comprises an input end and an output end, is respectively and electrically connected with the photovoltaic power generation device, the high-frequency switching power supply and the storage battery pack and is used for controlling charging and discharging of the direct-current power supply system in different time periods;
the information acquisition modules are respectively arranged in the electric connection lines, are electrically connected with the intelligent controller and are used for feeding back information to the intelligent controller;
the commercial power comprises a commercial power output end and a commercial power input end, the commercial power output end is electrically connected with the input end of the high-frequency switching power supply, and the commercial power input end is electrically connected with the output end of the photovoltaic power generation device;
the power supply side bus is electrically connected with the photovoltaic power generation device, the high-frequency switching power supply and the storage battery pack respectively;
and the shared bus is respectively electrically connected with the power supply side bus and the plurality of users and is used for providing direct current for the users.
2. The dc building power supply system of claim 1, further comprising: and the meteorological information acquisition module is electrically connected with the intelligent controller and is used for acquiring meteorological information.
3. The dc building power supply system of claim 1, further comprising: and the wireless communication module is electrically connected with the intelligent controller and is used for realizing wireless control of the direct current power supply system.
4. The dc building power supply system of claim 1, further comprising: and the lightning protection device is arranged at the joint of each electrical connection circuit.
5. The dc building power supply system of claim 1, wherein the standard voltage of the dc power supply system is 240V.
6. An operation method of the direct current building power supply system according to any one of claims 1 to 5, characterized by comprising a first environment, a second environment and a third environment, wherein the illumination intensity in the first environment, the second environment and the third environment is weakened in sequence;
in the first environment, the photovoltaic power generation device normally generates power, the generated energy of the photovoltaic power generation device is sufficient, and the photovoltaic power generation device supplies power to a user; the intelligent controller judges whether the storage battery needs to be charged or not according to the energy storage condition of the storage battery pack; if the storage battery pack has an energy storage space, the intelligent controller controls the photovoltaic power generation device to charge the storage battery pack; if the storage battery pack has no energy storage space, the intelligent controller controls the photovoltaic power generation device to stop charging the storage battery pack, and part of electric quantity of the photovoltaic power generation device is input into a shared charging grid to charge other storage battery packs, or; the intelligent controller controls the photovoltaic power generation device to transmit electric energy to a power grid;
in the second environment, the intelligent controller receives the power generation condition of the photovoltaic power generation device in real time through the information acquisition module; if the photovoltaic power generation device is not enough to provide electric energy for a user due to insufficient illumination intensity, starting the high-frequency switching power supply, and supplying power by the commercial power; providing power to a user by the photovoltaic power generation device if the photovoltaic power generation device is sufficient to provide power to the user;
in the third environment, the intelligent controller controls the high-frequency switching power supply, and the commercial power supplies power to the user; and if the commercial power is at a high power consumption peak, the intelligent controller controls the storage battery pack to supply power additionally.
7. The method of claim 6, wherein the step of controlling the secondary battery to supplement the power supply further comprises:
after the storage battery pack discharges, the intelligent controller controls the photovoltaic power generation device to charge the storage battery according to the environmental information collected by the meteorological information collection module; if the first environment is judged according to the environmental information acquired by the meteorological information acquisition module, the storage battery pack does not need to be charged; and if the environment information acquired by the meteorological information acquisition module is judged to be a third environment, the storage battery pack needs to be charged.
8. The method according to claim 6, wherein the dc power supply system comprises a wireless communication module, and the wireless communication module receives or executes the command from the intelligent controller according to the information collected by the information collection module.
9. The method according to claim 6, wherein the intelligent controller is configured to perform valley charging, peak discharging, and flat rectification for DC direct supply when the illumination intensity is continuously insufficient.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119051141A (en) * | 2024-10-31 | 2024-11-29 | 上海韦岚新能源科技有限责任公司 | Green energy sharing system and management method based on optical storage system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119051141A (en) * | 2024-10-31 | 2024-11-29 | 上海韦岚新能源科技有限责任公司 | Green energy sharing system and management method based on optical storage system |
| CN119051141B (en) * | 2024-10-31 | 2025-01-21 | 上海韦岚新能源科技有限责任公司 | Green energy sharing system and management method based on photovoltaic storage system |
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