CN117318059B - Light storage alternating current-direct current mixing system suitable for city updating building - Google Patents
Light storage alternating current-direct current mixing system suitable for city updating building Download PDFInfo
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- CN117318059B CN117318059B CN202311594546.XA CN202311594546A CN117318059B CN 117318059 B CN117318059 B CN 117318059B CN 202311594546 A CN202311594546 A CN 202311594546A CN 117318059 B CN117318059 B CN 117318059B
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/30—Constructional details of charging stations
- B60L53/31—Charging columns specially adapted for electric vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/50—Charging stations characterised by energy-storage or power-generation means
- B60L53/51—Photovoltaic means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/50—Charging stations characterised by energy-storage or power-generation means
- B60L53/53—Batteries
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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
- H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
- H02J3/322—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
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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
- 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
- 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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/40—The network being an on-board power network, i.e. within a vehicle
- H02J2310/48—The network being an on-board power network, i.e. within a vehicle for electric vehicles [EV] or hybrid vehicles [HEV]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to a building light storage alternating current-direct current hybrid system suitable for city updating, which comprises: a direct current part and an alternating current part; the direct current part and the alternating current part are connected through a bidirectional converter; the alternating current part includes: an alternating current bus, an alternating current power grid, a transformer and an alternating current load; the direct current part includes: the photovoltaic system comprises a direct current bus, a first direct current converter, a photovoltaic unit, a second direct current converter, an energy storage battery, a third direct current converter, a charging pile and a direct current load in a building; the first direct current converter is connected with the photovoltaic unit and the direct current bus; the second direct current converter is connected with the energy storage battery and the direct current bus; the third direct current converter is connected with the charging pile and the direct current bus; the photovoltaic unit is used for generating direct current which is used for supplying power to direct current loads in the building so as to reduce impact on the alternating current power grid.
Description
Technical Field
The disclosure relates to the technical field of power supply, in particular to an alternating current-direct current hybrid system suitable for urban updated buildings.
Background
In the prior art, the photovoltaic power generation is very common to be additionally arranged on a building. The defects of the photovoltaic are that the photovoltaic is additionally arranged in the existing building at present, after the components are connected in series and parallel to form an array, the array is converted into alternating current through an inverter, and the alternating current is directly connected into an original bus of a distribution room. The mode of 'self-power-consumption, surplus electricity surfing' is adopted, photovoltaic power generation is preferentially supplied to loads in a building for use, and surplus parts enter a public power grid. And for a public power grid, after photovoltaic access, the photovoltaic power grid is overlapped with the original load curve to form a new load curve. Because of randomness and fluctuation of the output of the photovoltaic power generation, a load curve becomes more uncertain and becomes an uncontrollable factor, the regulation difficulty of the public power grid is increased, the electric energy quality of the public power grid is also influenced to a certain extent, and friendly interaction with the public power grid cannot be realized.
Disclosure of Invention
In order to overcome the problems in the related art, the present disclosure provides an optical storage ac/dc hybrid system suitable for urban update buildings, so as to solve the above-mentioned problems.
According to a first aspect of embodiments of the present disclosure, there is provided a light storage ac/dc hybrid system suitable for use in urban retrofit buildings, comprising:
a direct current part and an alternating current part;
the direct current part and the alternating current part are connected through a bidirectional converter;
the alternating current part includes: an alternating current bus, an alternating current power grid, a transformer and an alternating current load;
the direct current part includes: the photovoltaic system comprises a direct current bus, a first direct current converter, a photovoltaic unit, a second direct current converter, an energy storage battery, a third direct current converter, a charging pile and a direct current load in a building;
the first direct current converter is electrically connected with the photovoltaic unit and the direct current bus;
the second direct current converter is electrically connected with the energy storage battery and the direct current bus;
the third direct current converter is electrically connected with the charging pile and the direct current bus;
the photovoltaic unit is arranged on the updated building; the charging pile is used for generating direct current which is preferentially used for supplying power to direct current loads in the building, and if surplus direct current exists, the direct current is used for supplying power to the charging pile; if there is still remaining, transmitting power to the energy storage battery; supplying power to the ac load in the ac section if there is more remaining; if there is still remaining, power is supplied to the ac power grid to reduce the impact on the ac power grid.
In one embodiment, the dc section includes a controller; the controller is respectively connected with the energy storage battery, the charging pile, the photovoltaic unit and the direct current load in the building.
In one embodiment, the bidirectional converter is connected to the ac bus and the dc bus, respectively.
In one embodiment, the installation location and type of the photovoltaic unit is adapted to the different adaptations of the area and load of the city update building.
According to a second aspect of the embodiments of the present disclosure, there is provided a control method of an optical storage ac/dc hybrid system suitable for urban update buildings, the control method comprising the steps of:
determining the power emitted by the photovoltaic unit;
determining a difference between the power and a direct current load in the building;
if the difference is greater than zero: continuously judging whether the state of charge value of the energy storage battery is greater than or equal to the highest state of charge value of the energy storage battery;
if yes, entering a mode I; the photovoltaic unit is used for supplying electricity to the direct current load in the building, preferably charging the charging pile, and transmitting electricity to an alternating current power grid in the alternating current part if the residual electric quantity is still remained after charging; if the result is negative, a second mode is entered, namely the photovoltaic unit is used for supplying direct current load electricity in the building and is used for charging the charging pile preferentially; if the residual electric quantity is still remained, power is transmitted to the energy storage battery; if the residual electric quantity exists, power is transmitted to an alternating current power grid in the alternating current part;
if the difference value is smaller than or equal to zero, continuously judging whether the state of charge value of the energy storage battery is smaller than or equal to the lowest state of charge value of the energy storage battery;
if the state of charge value of the energy storage battery is smaller than or equal to the lowest state of charge value of the energy storage battery, continuously judging whether the power generated by the photovoltaic unit is larger than zero, if so, entering a mode III, namely the photovoltaic unit and the charging pile jointly supply power for the direct current load in the building, and if not, entering a mode IV, namely the charging pile supplies power for the direct current load in the building;
if the state of charge value of the energy storage battery is greater than the lowest state of charge value of the energy storage battery;
then continuing to calculate whether the result of the sum of the difference value of the power and the direct current load in the building and the power of the energy storage battery is greater than zero;
if the result is greater than zero, enter mode five: the charging pile and the photovoltaic unit jointly supply power for a direct current load in the building;
if the result is zero or less, enter mode six: the charging pile and the photovoltaic unit jointly supply power for the direct current load in the building.
In one embodiment, in the third mode, if the electricity consumption in the building is in the electricity price valley period, the ac power grid charges the energy storage battery through a bidirectional converter.
In one embodiment, in the fifth mode, if the power supplied by the charging pile and the photovoltaic unit together is insufficient, the energy storage battery discharges, and the energy storage battery and the charging pile and the photovoltaic unit together supply power to the direct current load in the building.
In one embodiment, in the sixth mode, if the power supplied by the charging pile and the photovoltaic unit together is insufficient, the ac power grid is added to supply the dc load in the building together with the charging pile and the photovoltaic unit.
In one embodiment, in the sixth mode, if the electricity consumption in the building is in the peak electricity price period, the energy storage battery is preferably used for discharging to replace the ac power grid, and the energy storage battery, the charging pile and the photovoltaic unit are used for supplying power to the direct current load in the building together.
The technical scheme that this application provided can include following beneficial effect:
1. the method and the device can reduce the impact of photovoltaic power generation on the alternating current power grid, and are favorable for realizing friendly interaction between photovoltaic power generation of urban updated buildings and the alternating current power grid.
2. The method reduces the engineering quantity and the manufacturing cost of the transformation of the original alternating-current power distribution room of the equipment, and particularly, under the condition that the energy storage battery and the photovoltaic unit are properly proportioned, the capacity of the original alternating-current power distribution room is not required to be increased even.
3. The method for controlling the flexible adjustment is provided, and the load peak-valley difference of the updated building load curve is reduced. Through reasonable configuration of the number of the photovoltaic units and the capacity of the energy storage battery, the building added with the photovoltaic units can interact with an alternating current power grid in a friendly way, participate in peak clipping, valley filling and other behaviors, and change random load into controllable load.
4. The charging pile is used for replacing part of building storage batteries, and the problems of high building storage cost and high fire safety hidden danger are solved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 is a block diagram illustrating a light storage AC/DC hybrid system suitable for use in urban retrofit buildings according to an exemplary embodiment;
FIG. 2 is a system diagram illustrating a controller of a light storage AC/DC hybrid system suitable for use in urban retrofit buildings according to an exemplary embodiment;
FIG. 3 is a flow chart illustrating a method of selecting photovoltaic units for a light storage AC/DC hybrid system suitable for use in urban retrofit buildings according to an exemplary embodiment;
FIG. 4 is a flow chart illustrating a control method of a light storage AC/DC hybrid system suitable for use in urban retrofit buildings according to an exemplary embodiment;
fig. 5 is a graph showing a comparison of building load curves of a light-storage ac-dc hybrid system and a general photovoltaic system suitable for city-update buildings according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
The application provides an optical storage alternating current-direct current hybrid system suitable for urban updating buildings, which is shown in a structural diagram in figure 1; the system may include:
a direct current part 11 and an alternating current part 12;
the direct current part 11 and the alternating current part 12 are connected through a bidirectional converter 13;
the ac part 12 includes: an ac busbar, an ac grid 121, a transformer 122 and an ac load 123;
the direct current part 11 includes: a dc bus 111, a first dc converter 115, a photovoltaic unit 113, a second dc converter 116, an energy storage battery 112, a third dc converter 119, a charging pile 118, and an in-building dc load 114;
the photovoltaic unit 113 is disposed on the retrofit building;
the first dc converter 115 is disposed between the photovoltaic unit 113 and the dc bus 111;
the second dc converter 116 is disposed between the energy storage battery 112 and the dc bus 111;
the third dc converter 119 is disposed between the charging pile 118 and the dc bus 111.
The direct current generated by the photovoltaic unit 113 preferentially supplies power to the direct current load 114 in the building, and if the direct current remains, the direct current power is supplied to the charging pile 118; if there is still remaining, power is transmitted to the energy storage battery 112; if there is still more, the ac load 123 in the ac part is supplied with power, and if there is still more, the ac power grid 121 is supplied with power to reduce the impact on the ac power grid 121.
The in-building dc load 114 refers to an in-building dc load, for example, dc lighting, and the like, and does not include the energy storage battery 112.
The charging pile 118 and the energy storage battery 112 are direct current loads outside the building.
According to the technical scheme, the impact of electricity generated by the photovoltaic unit on an alternating current power grid is reduced, and bidirectional friendly interaction is realized.
In one embodiment, referring to fig. 2, the dc section 11 includes a controller 117; the controller 117 is connected to the energy storage battery 112, the photovoltaic unit 113 and the in-building dc load 114, respectively.
In this embodiment, the controller 117 includes control logic and hardware. The controller 117 may include the following functions:
1. operation mode selection and configuration management: the controller 117 may select an operating mode of the system, such as autonomous operation, parallel operation with the grid, and the like.
2. Monitoring and control of internal devices of the system: the controller 117 is responsible for monitoring the operation state of each device inside and realizing the optimized operation of the system by controlling the devices.
3. Coordinated control of the system, the main power grid and the user: the controller 117 may adjust the power mode and power output of the system according to external power market demands and consumer power demands, and coordinate with the main grid.
4. Safety protection and fault handling of the system: in the event of a safety problem or failure of the system, the controller 117 needs to identify and process in time to ensure safe operation of the system.
In summary, the controller is an intelligent core of the system, and by applying advanced computer technology and control method, the system can optimize and adjust internal and external conditions, and improve the economy, reliability and safety of the system.
In the present embodiment, the photovoltaic unit 113 includes: the photovoltaic subunits are connected in series and parallel to form a photovoltaic unit 113, and are connected into a first direct current converter 115, then pass through a direct current convergence metering box and finally are connected into a direct current bus 111.
The photovoltaic unit 113 may be a crystalline silicon component or a thin film component, and may be selected according to the requirements of the building for aesthetics and power generation. In general, thin film batteries are more suitable for harmonious unification with other building materials, such as glass, aluminum plates, stone materials and the like, and are more suitable for the performance of building elevation effects relative to crystalline silicon components. The crystalline silicon photovoltaic unit cell has high conversion efficiency and is more suitable for building roofs.
The first dc converter 115: the first dc converter 115 is an important device of the light storage ac/dc hybrid system suitable for urban update buildings, and converts dc generated by the photovoltaic array into a stable dc bus voltage.
Direct current collection flow metering box: the device comprises a breaker, a lightning arrester, a multifunctional ammeter (with a communication function) and the like.
In some embodiments, referring to a method flow diagram of selecting a photovoltaic unit shown in fig. 3;
determining the type and installation location of the photovoltaic unit assembly includes the steps of:
in step S201, an updated modification target of the target building is determined.
In the present embodiment, updating the retrofit targets includes: zero-carbon building, zero-energy-consumption building and green building. Different retrofit targets have different duty cycle requirements for renewable energy generation.
In step S202, energy consumption simulation calculation is performed on the target building, and a photovoltaic power generation amount requirement is determined according to a requirement on the renewable energy power generation amount duty ratio in the update and transformation target.
In step S203, the type of the photovoltaic unit assembly is primarily determined according to the type of the building structure and the building effect.
In step S204, statistics is performed on the building photovoltaic available area, and whether the annual energy production meets the requirement is calculated according to the photovoltaic available area, the photovoltaic module unit area power, the photovoltaic conversion efficiency and the initially selected module type.
In this embodiment, the three parameters may be multiplied according to the available photovoltaic area, the power per unit area of the photovoltaic module, and the photoelectric conversion efficiency, so that an effective power generation amount per unit time may be obtained, and then the time may be multiplied, so as to obtain a photovoltaic power generation amount of one year.
If the requirement is not satisfied, executing step S205, otherwise executing step S206;
in step S205, the photovoltaic unit module type, the installation angle, or the green power is acquired through the adjacent building is adjusted until the annual energy production meets the demand. Rechecking and calculating the load, and judging whether the load meets the structural requirement or not; and if the load does not meet the requirement, adjusting the type of the photovoltaic unit assembly or reinforcing the structure.
In step S206, rechecking calculation is carried out on the load, and whether the load meets the requirement is judged; and if the load does not meet the requirement, adjusting the type of the assembly or reinforcing the structure.
The charging pile 118 may be used to charge an electric vehicle, where the electric vehicle is located in an electric vehicle charging area around the target building; the charging stake 118 may also be used for discharging, specifically: the electric vehicle is discharged through the charging stake 118.
The controller 117 is used for controlling the energy storage battery 112 and the direct current load 114 in the building to charge when the photovoltaic unit 113 performs photovoltaic power generation, so as to regulate the impact of the power generation of the photovoltaic unit 113 on the load impact of the power grid.
In some embodiments, it may further include: a bidirectional converter 13, the bidirectional converter 13 being a conversion device between direct current and alternating current for inverting the direct current to alternating current and rectifying the alternating current to direct current.
The light storage alternating current-direct current hybrid system suitable for the urban updating building is characterized in that a general flexible energy management system is built, the energy fine regulation and control function is realized, the energy flow of each device is monitored and visualized in real time, the system is cloud, and the system is controllable and can be checked on any terminal such as a mobile phone and a computer.
In some embodiments, the method may further comprise a monitoring unit comprising the following devices:
data acquisition device, environmental monitor and various sensor accessories, monitoring computer, display equipment, etc. The monitoring unit adopts the high-reliability industrial personal computer to collect data in a centralized way, measures and displays the working state, direct current input voltage and current, fault alarm information and environmental parameters of the system, and counts and displays the information such as daily power generation amount, total power generation amount, energy conservation and emission reduction indexes and the like to form a printable report. The data acquisition controller provides an RS485 interface and is used for being connected with a converter, a solar radiation instrument, an ambient temperature sensor, a component temperature sensor and the like, and the data acquisition controller is provided with an Ethernet interface which is optional. The data storage and query function is provided, the data can be recorded for more than 25 years, and the data can be conveniently archived and queried. The system also has an open communication protocol and a standard communication interface, can send related information to a central monitoring room for centralized monitoring and realizes automatic fault recording and recording calculation of electricity consumption evaluation indexes.
In some embodiments, the energy storage battery 112 includes a battery pack and its management system (BMS).
A battery pack: the battery type can be lithium iron phosphate, lead acid and the like, and consists of battery cells connected in series and parallel.
BMS: the battery system is provided with a battery management system which is used for data processing, monitoring and controlling of the battery system in the whole system and simultaneously communicates with a background monitoring system.
The second dc converter 116 is configured to receive a signal from the controller 117 and control the charge/discharge power of the energy storage battery 112.
In some embodiments, the energy storage battery power and capacity configuration method targets that the building gain is greater than the cost after using the energy storage. The gain after energy storage is increased is compared with the cost of energy storage. The method comprises the steps of obtaining the benefits of the electric charge, wherein the benefits comprise the benefits of reducing the capacity increasing investment of the transformer and the electric charge brought by the spontaneous self-use of the photovoltaic residual electricity from the online operation, and the costs comprise the initial investment and the operation and maintenance costs. The power and capacity of the configured energy storage need to be satisfied, and the building benefit is greater than the cost after the energy storage is used.
In some embodiments, the power and capacity of the energy storage battery configured when determining the power and capacity of the energy storage battery need to be met, and after using the energy storage battery, the construction benefit (c+d) is greater than the cost (a+b);
the method comprises the steps of obtaining a photovoltaic residual electricity, wherein the obtaining of the yield comprises the step of reducing the power charge yield d caused by the fact that the capacity increasing investment c of a transformer is changed from internet surfing to spontaneous self-use, and the cost comprises the initial investment a and the operation and maintenance cost b of an energy storage battery;
setting Pbat as energy storage power configured by an energy storage battery, and Cbat as configured energy storage capacity;
initial investment of energy storage battery
a=Unitbat Cbat；
Wherein Unitbat is unit investment; a is initial investment;
energy storage battery operation and maintenance cost:
b= Unitop Cbat 365 QUOTE y；
wherein, the Unitop is the operation and maintenance cost of unit capacity of a single day;
b is the operation and maintenance cost;
y is the energy storage life;
cost = initial investment a + operational maintenance cost b;
revenue = reducing transformer capacity increasing investment c + surplus electricity changes from internet surfing to electricity fee revenue d brought by spontaneous self-use;
the transformer capacity-increasing investment c is reduced by adopting the following formula:
c=Unitcapacity Pbat；
wherein Unitcaptability is the cost of capacity of the capacity increasing unit;
the electricity charge benefit d caused by changing the online operation into the spontaneous self-use operation is calculated by adopting the following formula:
d=（Price1-Price2）Cbat 365 y；
price1 is electricity Price purchased from a power grid;
price2 is the electricity Price of the residual electricity on the internet.
In one embodiment, the dc section includes a controller 117; the energy storage battery 112, the charging pile 118, the photovoltaic unit 113 and the in-building direct current load 114 are respectively connected with the controller 117.
Referring to fig. 4, the controller uses the following control strategy to control:
determining the power P emitted by the photovoltaic unit 113 ren 。
Determining the power P ren With the direct current load P in the building load Is a difference in (2);
if the difference is greater than zero, continuing to determine whether the state of charge value SOC of the energy storage battery 112 is greater than or equal to the highest state of charge value SOC of the energy storage battery 112 max ；
If the state of charge value SOC is greater than or equal to the highest state of charge value SOC max The method comprises the steps of carrying out a first treatment on the surface of the Then mode one is entered, i.e. the photovoltaic unit 113 charges the charging pile preferentially; supplying power to the alternating current load in the alternating current part if the residual electric quantity exists, and transmitting power to the alternating current power grid if the residual electric quantity exists;
if the state of charge value SOC is less than the highest state of charge value SOC max A second mode is entered, namely, the photovoltaic unit 113 charges the charging pile preferentially; if there is a remaining charge, power is supplied to the energy storage battery 112. And if the residual electric quantity is remained, supplying power to the alternating current load in the alternating current part, and if the residual electric quantity is remained, transmitting power to the alternating current power grid.
In some embodiments, if the difference is less than or equal to zero, it is determined whether the state of charge value SOC of the energy storage battery 112 is less than or equal to the lowest state of charge value SOC of the energy storage battery 112 min ；
If the state of charge (SOC) of the energy storage battery 112 is less than or equal to the lowest SOC of the energy storage battery 112 min ；
Judging the power P emitted by the photovoltaic unit 113 ren Whether or not it is greater than zero, if the power P emitted by the photovoltaic unit 113 ren Greater than zero, enter mode three: namely, the charging pile 118 discharges to supply power to the direct current load in the building together with the photovoltaic unit 113; if all load requirements of the building cannot be met, power is taken from an alternating current power grid to supply power for direct current loads in the building;
if the power P emitted by the photovoltaic unit 113 ren If the power is less than or equal to zero, the charging pile 118 supplies power to the direct current load of the building, and if the power cannot meet the direct current load requirement in the building, the power is taken from an alternating current power grid to supply power to the direct current load in the building; price of electricityDuring the valley period, the energy storage battery 112 is charged.
In some embodiments, if the state of charge value SOC of the energy storage battery 112 is greater than the minimum state of charge value SOC of the energy storage battery 112 min ；
Judging the difference P ren -P load Energy storage power P with the energy storage battery 112 bat Whether the sum of (2) is greater than zero;
if greater than zero, enter mode five: that is, the charging pile 118 and the photovoltaic unit 113 supply power to the direct current load in the building together, and if the direct current load in the building cannot be satisfied, the energy storage battery 112 discharges to supply power to the direct current load in the building together with the charging pile and the photovoltaic unit;
if not more than zero, enter mode six: that is, the charging pile 118 and the photovoltaic unit 113 supply power to the direct current load in the building together, and if all the load requirements in the building cannot be met, the alternating current power grid is used for supplying power to the direct current load in the building; during peak electricity rates, the energy storage battery 112 discharges.
In the above embodiment, two layers of control are used to operate the system in the six modes described above.
A first layer: device level control hardware: including the first dc converter 115, the second dc converter 116 and the bi-directional converter 13 described above, and the third dc converter 119.
A second layer: system level control hardware: including the controller 117 described above, coordinates the operation of the various units within the system by an overall control method.
The control method is formulated by the controller and issued to the equipment layer, and the power adjustment is completed by the equipment layer.
Referring to a comparison graph of building load curves shown in fig. 5, a circular connection curve is a building load curve, a triangular connection curve is a load curve obtained by adding photovoltaic in the prior art, the power is transmitted to a power grid by taking electricity from the power grid to perform bidirectional energy flow with the power grid, and the regulation difficulty is increased for the power grid.
Referring to a graph of building coincidence curve shown in fig. 5, a square connection curve is a maximum value of a triangular connection curve to be considered for power distribution and power increase of an original building by adopting the prior art after photovoltaic is added to the target building by adopting the technical scheme of the invention; if the technology in the scheme is adopted, the capacity of the distribution room only needs to be considered to be the maximum value of the square connecting curve, so that the engineering quantity and the manufacturing cost of equipment transformation are reduced. Under the condition of proper proportion of energy storage and photovoltaics, the original alternating current distribution capacity is not even required to be increased.
The friendly interaction effect with the power grid after the system is adopted is shown in the figure 5, the square connecting curve is the load curve after the scheme is adopted, the flexible adjustment of the energy storage system is increased, and compared with the triangular connecting curve, the peak-valley difference of the load is reduced. Through reasonable configuration of photovoltaic and energy storage capacity, the building with the photovoltaic system can interact with a power grid in a friendly way, participate in peak clipping, valley filling and other behaviors, and change random load into controllable load. The AC-DC conversion device is reduced, the electric energy conversion link is reduced, the system efficiency is improved, and the DC-AC efficiency can be improved by 6-10%.
The technical scheme of this application, the system includes light, stores up, straight, gentle, exchange five parts, inserts former building distribution system as whole. The influence of building additional photovoltaic on public power grids and building power distribution networks is reduced. The AC/DC conversion device is reduced, the electric energy conversion link is reduced, and the system efficiency is improved. The charging pile is used for replacing part of building storage batteries, so that the problems of high building storage cost and high fire safety hidden danger are solved.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (7)
1. Light stores up alternating current-direct current hybrid system suitable for city update building, its characterized in that includes:
a direct current part and an alternating current part;
the direct current part and the alternating current part are connected through a bidirectional converter;
the alternating current part includes: an alternating current bus, an alternating current power grid, a transformer and an alternating current load;
the direct current part includes: the photovoltaic system comprises a direct current bus, a first direct current converter, a photovoltaic unit, a second direct current converter, an energy storage battery, a third direct current converter, a charging pile and a direct current load in a building;
the first direct current converter is connected with the photovoltaic unit and the direct current bus;
the second direct current converter is connected with the energy storage battery and the direct current bus;
the third direct current converter is connected with the charging pile and the direct current bus;
the photovoltaic unit is arranged on the updated building; the charging pile is used for generating direct current which is preferentially used for supplying power to direct current loads in the building, and if surplus direct current exists, the direct current is used for supplying power to the charging pile; if there is still remaining, transmitting power to the energy storage battery; supplying power to the ac load in the ac section if there is more remaining; if there is any remaining, supplying power to the ac grid; the bidirectional converter is respectively connected with the alternating current bus and the direct current bus; the direct current part comprises a controller; the controller is respectively connected with the energy storage battery, the charging pile, the photovoltaic unit and the direct current load in the building;
the controller is used for executing the following control method:
determining the power emitted by the photovoltaic unit;
determining a difference between the power and a direct current load in the building;
if the difference value is greater than zero, continuously judging whether the state of charge value of the energy storage battery is greater than or equal to the highest state of charge value of the energy storage battery;
if the state of charge value is greater than or equal to the highest state of charge value; then enter mode one, namely the said photovoltaic unit charges the said charging pile preferentially; supplying power to the alternating current load in the alternating current part if the residual electric quantity exists, and transmitting power to the alternating current power grid if the residual electric quantity exists;
if the state of charge value is smaller than the highest state of charge value, entering a second mode, namely, the photovoltaic unit charges the charging pile preferentially; if the residual electric quantity exists, power is transmitted to the energy storage battery;
supplying power to the alternating current load in the alternating current part if residual electric quantity is remained, and transmitting power to the alternating current power grid if residual electric quantity is remained;
if the difference value is smaller than or equal to zero, judging whether the state of charge value of the energy storage battery is smaller than or equal to the lowest state of charge value of the energy storage battery;
if the state of charge value of the energy storage battery is smaller than or equal to the lowest state of charge value of the energy storage battery;
judging whether the power emitted by the photovoltaic unit is greater than zero, and entering a mode III if the power emitted by the photovoltaic unit is greater than zero: the charging pile discharges and supplies power to the direct current load in the building together with the photovoltaic unit; if all load requirements of the building cannot be met, taking electricity from an alternating current power grid to supply power for direct current loads in the building;
if the power emitted by the photovoltaic unit is smaller than or equal to zero, entering a fourth mode, namely, the charging pile supplies power for the direct-current load of the building, and if the direct-current load requirement in the building cannot be met, taking power from an alternating-current power grid to supply power for the direct-current load in the building; the energy storage battery is charged in the electricity price valley period;
determining the type and installation location of the photovoltaic unit assembly includes the steps of:
step S201: determining an updated transformation target for the building;
step S202: performing energy consumption simulation calculation on the building, and determining photovoltaic power generation capacity requirements according to the requirements on the renewable energy power generation capacity duty ratio in the updated transformation target;
step S203: according to the building structure type and the building effect, the type of the photovoltaic unit component is preliminarily determined;
step S204: counting the building photovoltaic available area, and calculating whether annual energy generation meets the requirement according to the photovoltaic available area, the unit area power of a photovoltaic module, the photoelectric conversion efficiency and the initially selected module type; if the requirement is not satisfied, executing step S205, otherwise executing step S206;
step S205: adjusting the type and the installation angle of the photovoltaic unit assembly or acquiring green electric power through adjacent buildings until annual energy production meets the requirement; rechecking and calculating the load, and judging whether the load meets the structural requirement or not; if the load does not meet the requirement, adjusting the type of the photovoltaic unit assembly or reinforcing the structure;
step S206: rechecking and calculating the load, and judging whether the load meets the requirement or not; and if the load does not meet the requirement, adjusting the type of the assembly or reinforcing the structure.
2. The light storage ac/dc hybrid system of claim 1 wherein said photovoltaic units are installed in different locations and types according to different adaptations of said city update building's photovoltaic availability area and load.
3. The control method of the light storage alternating current-direct current hybrid system suitable for the urban updating building is characterized by comprising the following steps of:
determining the power emitted by the photovoltaic unit;
determining a difference between the power and a direct current load in the building;
if the difference is greater than zero: continuously judging whether the state of charge value of the energy storage battery is greater than or equal to the highest state of charge value of the energy storage battery;
if yes, entering a mode I; the photovoltaic unit is used for supplying electricity to the direct current load in the building, preferably charging the charging pile, and transmitting electricity to an alternating current power grid in the alternating current part if the residual electric quantity is still remained after the charging; if the result is negative, a second mode is entered, namely the photovoltaic unit is used for supplying direct current load electricity in the building and is used for charging the charging pile preferentially; if the residual electric quantity is still remained, power is transmitted to the energy storage battery; if the residual electric quantity exists, power is transmitted to an alternating current power grid in the alternating current part;
if the difference value is smaller than or equal to zero, continuously judging whether the state of charge value of the energy storage battery is smaller than or equal to the lowest state of charge value of the energy storage battery;
if the state of charge value of the energy storage battery is smaller than or equal to the lowest state of charge value of the energy storage battery, continuously judging whether the power generated by the photovoltaic unit is larger than zero, if so, entering a mode III, namely the photovoltaic unit and the charging pile jointly supply power for the direct current load in the building, and if not, entering a mode IV, namely the charging pile supplies power for the direct current load in the building;
if the state of charge value of the energy storage battery is greater than the lowest state of charge value of the energy storage battery;
then continuing to calculate whether the result of the sum of the difference value of the power and the direct current load in the building and the power of the energy storage battery is greater than zero;
if the result is greater than zero, enter mode five: the charging pile and the photovoltaic unit jointly supply power for a direct current load in the building;
if the result is zero or less, enter mode six: the charging pile and the photovoltaic unit jointly supply power for a direct current load in the building;
determining the type and installation location of the photovoltaic unit assembly includes the steps of:
step S201: determining an updated transformation target for the building;
step S202: performing energy consumption simulation calculation on the building, and determining photovoltaic power generation capacity requirements according to the requirements on the renewable energy power generation capacity duty ratio in the updated transformation target;
step S203: according to the building structure type and the building effect, the type of the photovoltaic unit component is preliminarily determined;
step S204: counting the building photovoltaic available area, and calculating whether annual energy generation meets the requirement according to the photovoltaic available area, the unit area power of a photovoltaic module, the photoelectric conversion efficiency and the initially selected module type; if the requirement is not satisfied, executing step S205, otherwise executing step S206;
step S205: adjusting the type and the installation angle of the photovoltaic unit assembly or acquiring green electric power through adjacent buildings until annual energy production meets the requirement; rechecking and calculating the load, and judging whether the load meets the structural requirement or not; if the load does not meet the requirement, adjusting the type of the photovoltaic unit assembly or reinforcing the structure;
step S206: rechecking and calculating the load, and judging whether the load meets the requirement or not; and if the load does not meet the requirement, adjusting the type of the assembly or reinforcing the structure.
4. A control method of a light-storing ac/dc hybrid system suitable for use in urban renewable buildings according to claim 3, characterized in that in said third mode, if the amount of electricity used in the building is in the electricity price valley period, the ac grid charges the energy storage battery through a bi-directional converter.
5. A control method of a light-storing ac/dc hybrid system suitable for use in urban renovation architecture according to claim 3, wherein in the fifth mode, if the power supplied by the charging pile and the photovoltaic unit together is insufficient, the energy storage battery discharges, and the energy storage battery supplies power to the dc load in the architecture together with the charging pile and the photovoltaic unit.
6. A control method of a light-storing ac/dc hybrid system suitable for urban updating building according to claim 3, characterized in that in said mode six, if the power supplied by said charging pile and said photovoltaic unit together is insufficient, said ac grid is added, together with said charging pile and said photovoltaic unit, to supply the dc load in the building.
7. The control method of a light-storing ac/dc hybrid system for city-renovated building according to claim 6, wherein in said mode six, if the amount of electricity used in said building is in a peak electricity price period, said ac power grid is preferentially replaced by discharging said energy storage battery, and said dc load in the building is supplied together with said charging pile and said photovoltaic unit.
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