CN116667405A - Low-carbon energy-saving method and system for complementary adjustment of multiple energy sources - Google Patents
Low-carbon energy-saving method and system for complementary adjustment of multiple energy sources Download PDFInfo
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- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 4
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Classifications
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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
- H02J3/008—Circuit arrangements for AC mains or AC distribution networks involving trading of energy or energy transmission rights
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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
- H02J3/12—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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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
- 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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- 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
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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
- 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
- H02J2300/28—The renewable source being wind energy
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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
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention belongs to the technical field of energy conservation and environmental protection, and particularly provides a low-carbon energy-saving method and system for complementary adjustment of multiple energy sources, wherein the method comprises the following steps: if the load is smaller than the sum of the renewable energy source power generation output power in the micro-grid, the micro-grid is powered and charged to the energy storage system by controlling the energy storage converter; when the energy storage system is full, the micro-grid only transmits redundant electric energy to the large power grid or supplies power to the adjustable load; if the load is greater than the sum of the renewable energy source power generation output power in the micro-grid, the energy storage system is enabled to discharge and supply power by controlling the energy storage converter; if the energy storage system can not continue discharging, the micro-grid absorbs electric energy from the large power grid to supply power, or the adjustable load is cut off, and the non-renewable energy source is started to generate power so as to ensure the micro-grid to supply power. The electricity cost of a railway or a park is reduced, and the operation efficiency of energy application and the utilization rate of equipment are improved; improving the level of renewable energy consumption; energy conservation and emission reduction, and environmental protection; the safe operation level of the power grid is improved, and the occupation of the capacity of the distribution network is reduced.
Description
Technical Field
The invention relates to the technical field of energy conservation and environmental protection, in particular to a low-carbon energy-saving method and system for complementary adjustment of multiple energy sources.
Background
The national iron group proposes to build a modern intelligent railway system, strengthen the research and application of novel carrying tools, research and develop the technologies of intelligent detection monitoring, operation maintenance and the like. Resources and energy are saved and utilized intensively, an intelligent energy management and control system is popularized and used, and natural lighting and ventilation are utilized.
The energy conservation of the railway is particularly important when the carbon reaches the peak carbon neutralization requirement proposed by the national level. The key point of railway energy conservation is to use renewable energy sources such as wind power generation, photovoltaic power generation, gas power generation, energy storage and the like, and to integrate the technologies together to form complementary adjustment of various energy sources, so that the energy conservation method is more reliable and more energy-saving for a power grid.
The system architecture is connected with the network without surfing and is off-network, the utilization rate of renewable energy sources such as solar energy, wind energy and the like is low, and the phenomena of wind and light discarding are serious. The regulation and control means are simple, most of the regulation and control means are single type energy storage systems, and the regulation and control performance is poor, the conversion efficiency is low, and the capacity redundancy is large. The method solves the problems of balance of energy supply and demand sides of the distributed system, improvement of comprehensive energy utilization rate and reduction of energy storage cost, and is an urgent need to be solved at present.
Disclosure of Invention
The invention aims at the technical problem of low comprehensive utilization rate of various energy sources in the prior art.
The invention provides a low-carbon energy-saving method for complementary adjustment of multiple energy sources, which comprises the following steps:
if the load is smaller than the sum of the renewable energy source power generation output power in the micro-grid, the micro-grid is powered and charged to the energy storage system by controlling the energy storage converter; when the energy storage system is full, the micro-grid only transmits redundant electric energy to the large power grid or supplies power to the adjustable load;
if the load is greater than the sum of the renewable energy source power generation output power in the micro-grid, the energy storage system is enabled to discharge and supply power by controlling the energy storage converter; if the energy storage system can not continue discharging, the micro-grid absorbs electric energy from the large power grid to supply power, or the adjustable load is cut off, and the non-renewable energy source is started to generate power so as to ensure the micro-grid to supply power.
Preferably, the renewable energy generation is stored to the lithium iron phosphate battery by configuring a customized Battery Management System (BMS), and the lithium iron phosphate battery is grid-connected to a large grid or island operation.
Preferably, the renewable energy source comprises one or more of photovoltaic power generation, wind power generation or hydro power generation; the large power grid is formed by generating electricity from non-renewable energy sources including one or more of nuclear, gas-fired or coal-fired.
Preferably, the on-site environment of renewable energy power generation is monitored and displayed in real time, the daily power generation capacity of each inverter is collected and displayed, the real-time power generation capacity and the historical power generation capacity are compared and analyzed, and the fluctuation condition of the photovoltaic power generation capacity along with the on-site environment is obtained; the site environment comprises sunlight intensity, ambient temperature and wind speed.
Preferably, the photovoltaic confluence acquisition device, the direct current detection instrument and the power quality analyzer are respectively applied to the confluence box, the direct current cabinet and the alternating current cabinet according to the requirement of power parameter detection of each link of photovoltaic power generation, so that the acquisition, monitoring, control and adjustment of the operation parameters and the state data of the photovoltaic cells, the confluence box, the direct current cabinet, the inverter and the alternating current cabinet are realized, and the efficiency of a power generation system is improved.
Preferably, the energy storage system is charged when the price of electricity of the large power grid is low; and when the price of the large power grid is high, the energy storage system is discharged for use in the park.
Preferably, when the renewable energy source power generation output power is reduced, the energy storage system is started to discharge to assist in matching with the micro-grid power supply;
when the electricity consumption period is in the valley period, the energy storage converter is controlled to enable the micro-grid to supply power and charge the energy storage system, and when the electricity consumption period is in the peak period, the energy storage system is started to discharge to assist in matching with the micro-grid to supply power.
The invention also provides a low-carbon energy-saving system with complementary adjustment of multiple energy sources, which is used for realizing a low-carbon energy-saving method with complementary adjustment of multiple energy sources and comprises a large power grid, a micro power grid, an energy storage converter and an energy storage system;
if the load is smaller than the sum of the renewable energy source power generation output power in the micro-grid, the micro-grid is powered and charged to the energy storage system by controlling the energy storage converter; when the energy storage system is full, the micro-grid only transmits redundant electric energy to the large power grid or supplies power to the adjustable load;
if the load is greater than the sum of the renewable energy source power generation output power in the micro-grid, the energy storage system is enabled to discharge and supply power by controlling the energy storage converter; if the energy storage system can not continue discharging, the micro-grid absorbs electric energy from the large power grid to supply power, or the adjustable load is cut off, and the non-renewable energy source is started to generate power so as to ensure the micro-grid to supply power.
The invention also provides an electronic device, which comprises a memory and a processor, wherein the processor is used for executing the steps of the low-carbon energy-saving method for realizing the complementary adjustment of multiple energy sources when the computer management program stored in the memory is executed.
The invention also provides a computer readable storage medium having stored thereon a computer management class program which when executed by a processor performs the steps of a low-carbon energy-saving method of multi-energy complementary regulation.
The beneficial effects are that: the invention provides a low-carbon energy-saving method and a system for complementary adjustment of multiple energy sources, wherein the method comprises the following steps: if the load is smaller than the sum of the renewable energy source power generation output power in the micro-grid, the micro-grid is powered and charged to the energy storage system by controlling the energy storage converter; when the energy storage system is full, the micro-grid only transmits redundant electric energy to the large power grid or supplies power to the adjustable load; if the load is greater than the sum of the renewable energy source power generation output power in the micro-grid, the energy storage system is enabled to discharge and supply power by controlling the energy storage converter; if the energy storage system can not continue discharging, the micro-grid absorbs electric energy from the large power grid to supply power, or the adjustable load is cut off, and the non-renewable energy source is started to generate power so as to ensure the micro-grid to supply power. The power consumption cost of a railway or a park is reduced, a personalized energy consumption scheme is provided, and the energy application operation efficiency and the equipment utilization rate are improved; improving the level of renewable energy consumption; energy conservation and emission reduction, and environmental protection; the safe operation level of the power grid is improved, and the occupation of the capacity of the distribution network is reduced. Railway power supply is an important circle for ensuring railway transportation, adopts a low-carbon technology with complementary adjustment of multiple energy sources, and greatly reduces carbon emission while improving power supply reliability to the greatest extent.
Drawings
FIG. 1 is a flow chart of a low-carbon energy-saving method for complementary adjustment of multiple energy sources;
fig. 2 is a schematic hardware structure of one possible electronic device according to the present invention;
FIG. 3 is a schematic diagram of a possible hardware configuration of a computer readable storage medium according to the present invention;
FIG. 4 is a schematic diagram of the triple heating and cooling power supply provided by the invention;
FIG. 5 is a graph showing the comparison of the economic benefits of the campus multi-energy complementary model provided by the present invention.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
FIG. 1 is a schematic diagram of a low-carbon energy-saving method and system for complementary adjustment of multiple energy sources, wherein the method comprises the following steps: if the load is smaller than the sum of the renewable energy source power generation output power in the micro-grid, the micro-grid is powered and charged to the energy storage system by controlling the energy storage converter; when the energy storage system is full, the micro-grid only transmits redundant electric energy to the large power grid or supplies power to the adjustable load; if the load is greater than the sum of the renewable energy source power generation output power in the micro-grid, the energy storage system is enabled to discharge and supply power by controlling the energy storage converter; if the energy storage system can not continue discharging, the micro-grid absorbs electric energy from the large power grid to supply power, or the adjustable load is cut off, and the non-renewable energy source is started to generate power so as to ensure the micro-grid to supply power. The power consumption cost of a railway or a park is reduced, a personalized energy consumption scheme is provided, and the energy application operation efficiency and the equipment utilization rate are improved; improving the level of renewable energy consumption; energy conservation and emission reduction, and environmental protection; the safe operation level of the power grid is improved, and the occupation of the capacity of the distribution network is reduced. Railway power supply is an important circle for ensuring railway transportation, adopts a low-carbon technology with complementary adjustment of multiple energy sources, and greatly reduces carbon emission while improving power supply reliability to the greatest extent.
The embodiment of the invention adopts a grid-connected mode and a isolated grid mode for explanation respectively.
In the grid-connected mode, the voltage and frequency of the micro-grid in places such as railways or parks are determined by the large grid. The energy storage application mainly plays a role in balancing and adjusting energy, so that the dynamic balance of the energy in the micro-grid is realized, and renewable energy sources are utilized to the maximum extent. At the moment, renewable energy sources such as fans, photovoltaics and the like are used for generating electricity, constant power control is adopted, and maximum power tracking is carried out.
The specific strategy is as follows: when the load is smaller than the sum of the renewable energy source power generation output power in the micro-grid, the micro-grid is enabled to charge the storage battery by controlling the energy storage converter, and the micro-grid can not transmit redundant electric energy to the large power grid until the storage battery is full; and otherwise, when the load is larger than the sum of the power generation output power of the renewable energy sources in the micro-grid, the storage battery is discharged by controlling the energy storage converter, and the micro-grid cannot absorb part of the electric energy from the large power grid until the storage battery cannot continue to discharge. The storage battery can be charged by utilizing the power grid when the electricity price is lowest, and the railway electricity cost is effectively reduced.
Another important function of energy storage application is to quickly adjust power, effectively reduce the influence of fluctuation of renewable energy power generation output power such as wind power, photovoltaic and the like on a large power grid and loads, and further ensure safe operation of the large power grid and reliable power supply of the loads.
And in the isolated network mode: different from the grid-connected mode, the adjustment of the power shortage and the frequency is required to be completed by depending on each micro power supply, an energy storage system and a control module in the micro power grid, so that the feeder line power flow in the micro power grid is required to be flexibly adjusted to adjust the voltage at each micro power supply interface and ensure the stability of the voltage to achieve the energy scheduling targets of optimal application economy, highest power supply reliability and optimal energy storage distribution.
(1) Energy storage converter (PCS): the energy storage converter can realize AC/DC conversion between the battery and the power grid, complete bidirectional energy flow between the battery and the power grid, and realize the functions of charge and discharge management of a battery system, charge and discharge power control of the battery energy storage system and switching between the two operation modes of grid connection and disconnection through an advanced control strategy.
(2) High power density and high capacity energy storage battery: the energy storage system battery generally adopts a lithium ion battery and a super capacitor. The composite material has the advantages of long cycle life, large charge and discharge multiplying power, no memory effect, high temperature resistance, large capacity, environment friendliness and the like. Technical parameters such as rated capacity, rated charge and discharge power, cycle life, serial-parallel connection mode of the battery pack and the like of the energy storage battery can be customized and configured according to specific application requirements.
(3) Battery Management System (BMS): the battery management system is secondary equipment for monitoring, predicting and protecting the battery of the battery energy storage unit, detects information such as voltage, current, temperature, SOC and the like of the battery, evaluates the state of the battery in real time, and uploads the information to the state monitoring system and the energy management system, so that damage and even safety accidents of the battery energy storage unit caused by improper use or various faults are avoided, and the battery management system is a main guarantee measure for safe operation of the battery energy storage unit. The storage battery management system mainly comprises the following equipment units: battery management module (BMU), battery pack control unit (GCU) and System Management Unit (SMU), and charge/discharge protection unit.
The energy storage system can provide comprehensive battery information management, on-line SOC monitoring, system protection, heat management, self-fault diagnosis, fault tolerance, flexible modular design and other functions according to the needs.
The main functions are as follows: power generation side energy storage: load regulation, smoothing intermittent energy, improving new energy consumption, improving standby capacity of a power grid and participating in frequency modulation. Power transmission and distribution energy storage: the method has the advantages of improving the electric energy quality, reducing the line loss, improving the spare capacity of a power grid, improving the utilization efficiency of power transmission and distribution equipment and delaying the capacity increasing requirement. User side energy storage: smoothing load curve, load transfer, peak clipping and valley filling. Emergency power supply: when the power grid is normal, the power grid is in a standby state, and when the power grid fails, the power grid can be started, so that continuous power supply of loads is ensured.
Wherein the renewable energy source comprises one or more of photovoltaic power generation, wind power generation or hydroelectric power generation; the large power grid is formed by generating electricity from non-renewable energy sources including one or more of nuclear, gas or coal power. As shown in fig. 4, the triple supply of cold, heat and electricity belongs to a distributed energy source, and compared with a traditional centralized power supply mode, the distributed energy source refers to a system which is formed by arranging a power generation system near a user in a small-scale, small-capacity (thousands of watts to 15 MW), modularized and distributed mode and can independently output electricity, heat and cold energy. Natural gas enters a gas internal combustion engine to be combusted, a generator is driven to generate electricity, and gas generated by the generator and cooling water of a cylinder sleeve provide cold or heat through a flue gas hot water type Yu Reji. The heat supply monitoring system utilizes a sensing technology, a data communication technology, a measurement and control technology and a heat supply network monitoring technology, and adopts a remote meter reading and automatic metering mode to realize real-time monitoring and automatic management of the heat supply system. The refrigerating system mainly comprises a refrigerating host, a refrigerating unit, a cooling tower, an ice storage tank, an ice melting and cooling plate exchanging device and the like, wherein the gas waste heat enters the refrigerating host, and the generated cold air is distributed to an office building, a dining room restaurant and a factory building through a series of procedures of the cooling tower, the refrigerating unit and the like. The refrigerating system monitors and controls the running state of each refrigerating link and device in real time, and ensures the safe and stable running of the whole refrigerating system.
The more specific scheme is that the signal acquisition and control of the processes of power generation, cold accumulation, heat accumulation, water supply, chemical water treatment, ventilation, pipe network and the like are finished mainly through a temperature sensor, a flow transmitter, a pressure switch, a regulating valve and a field bus which are configured on site, so that the remote monitoring of the combined cooling, heating and power application is realized. The system realizes the functions of remote signaling, remote control, remote measurement and remote regulation of power supply and distribution, logically controls the grid connection of the generator set and the mains supply, controls the outlet switch of the generator set, the low-voltage side switch of the transformer, collects the state of the switch and the operating parameters of the generator set according to the selected operating mode, and realizes the on-site and remote monitoring of the power distribution and grid connection system. Multiple automatic protection, high-low voltage protection, overheat overload protection, phase sequence protection, water flow switch protection and pressure switch protection. The humanized design shows that the running condition of the unit is clear at a glance, and the unit has a fault self-checking function. The free heat energy in the air is absorbed in a large quantity to heat, and the energy consumption can be saved by 70%.
Firstly, setting a bidirectional converter as a voltage/frequency mode, and establishing reference voltage and frequency of a micro-grid, wherein energy is mainly provided by an energy storage system (battery); and then the wind power and the photovoltaic system are integrated into a micro-grid, and the micro-grid dispatching control system enters a background cyclic dispatching working mode to continuously monitor the output power and the load power of a micro-source (wind power and photovoltaic system).
If the micro-source output power is larger than the load power, namely when the load is smaller than the sum of the renewable energy source generation output power in the micro-grid, firstly, whether the gas generator is started or not is checked, and if so, the gas generator stops working. The gas generator corresponds to a large power grid, and the gas generator is used for transmitting power to the large power grid. If the micro-source output power is still greater than the load power, the energy storage system is charged until the upper charging limit is reached, then an adjustable load can be started, and the adjustable load is supplied with power through the micro-grid, wherein the adjustable load is an electricity utilization end which can cut off the load and does not need to be started.
If the micro-source output power is monitored to be smaller than the load power, namely, when the load is larger than the sum of the renewable energy power generation output powers in the micro-grid, firstly, whether an adjustable load can be cut off is judged, if yes, the load can be cut off (namely, the load can be cut off), if not, the energy storage system is started to discharge until the discharge lower limit is reached, then the standby power supply gas generator is started, and the micro-grid power supply is ensured.
The optimal scheme is that the multi-energy complementation is based on the step electricity price, and the power generation and the power utilization in the railway or the park are reasonably distributed, so that the multi-energy complementation operation company achieves the technology of maximizing the benefit. The mechanism of multipotent complementation is mainly embodied in the following aspects:
(1) Step electricity utilization multipotency complementation: charging the energy storage system when the electricity price of the large power grid is low; and when the price of the large power grid is high, the energy storage system is discharged for use in the park, and the electricity consumption cost of the park is effectively reduced through photovoltaic and gas power generation.
As shown in fig. 5, wherein the red part of the table represents that the campus electricity is supplied by the large power grid, the negative number in the energy storage represents that the energy storage system is charging, and the positive number represents that the table energy storage system is discharging; the power generation time of the photovoltaic is as follows: 9:00-18:00; the energy storage and discharge time is as follows: 11:00-14:00, the charging time is: 0:00-3:00.
Primary step electricity price period of large power grid: 0:00-6:00, 23:00-0:00; price: 0.38 yuan/kWh; secondary step electricity price period: 6:00-10:00, 15:00-18:00, 21:00-23:00; price: 0.84 yuan/kWh; three-stage step electricity price period: 10:00-15:00, 18:00-21:00; price: 1.32 yuan/KWh.
The calculation formula is as follows: large grid electricity charge expenditure = primary step electricity price x primary step electricity price period electricity charge total amount + secondary step electricity price x secondary step electricity price period electricity charge total amount + tertiary step electricity price x tertiary step electricity price period electricity charge total amount.
Through the comparison of the electricity charge expenditure under the two modes, after the energy efficiency management application of the multi-energy complementation is adopted in the park, the electricity charge purchasing cost is reduced by about half, and the multi-energy complementation company can acquire certain profit from the electricity charge purchasing cost.
(2) By the multi-energy complementary smooth distributed energy output: the noon sun is covered by clouds, the photovoltaic power generation output drops instantaneously, the power supply stability is affected, and at the moment, the energy storage system is used for supplying and smoothing power output.
(3) Peak clipping and valley filling: when the electricity consumption period is in the valley period, the energy storage converter is controlled to enable the micro-grid to supply power and charge the energy storage system, and when the electricity consumption period is in the peak period, the energy storage system is started to discharge to assist in matching with the micro-grid to supply power. The night power consumption load is low, the daytime power consumption load is high, and the power supply fluctuation of the large power grid is large. The energy storage is controlled by the multi-energy complementary application, the extra electric quantity at night is stored, the stored electric quantity is released during the peak of the daytime electricity consumption, and the peak clipping and valley filling are realized.
(4) Alleviate and fill electric pile and strike and economical charging to the electric wire netting: the direct-current charging pile charges and causes great impact to the electric wire netting in the twinkling of an eye, through energy storage output, effectively solves the problem that direct-current charging pile instantaneous power load risees.
The beneficial effects are that: the power consumption cost of a railway or a park is reduced, a personalized energy consumption scheme is provided, and the application operation efficiency and the equipment utilization rate are improved; improving the level of renewable energy consumption; energy conservation and emission reduction, and environmental protection; the safe operation level of the power grid is improved, and the occupation of the capacity of the distribution network is reduced. Railway power supply is an important circle for ensuring railway transportation, adopts a low-carbon technology with complementary adjustment of multiple energy sources, and greatly reduces carbon emission while improving power supply reliability to the greatest extent.
The invention also provides a low-carbon energy-saving system with complementary adjustment of multiple energy sources, which is used for realizing the low-carbon energy-saving method with complementary adjustment of the multiple energy sources, and comprises a large power grid, a micro power grid, an energy storage converter and an energy storage system;
if the load is smaller than the sum of the renewable energy source power generation output power in the micro-grid, the micro-grid is powered and charged to the energy storage system by controlling the energy storage converter; when the energy storage system is full, the micro-grid only transmits redundant electric energy to the large power grid or supplies power to the adjustable load;
if the load is greater than the sum of the renewable energy source power generation output power in the micro-grid, the energy storage system is enabled to discharge and supply power by controlling the energy storage converter; if the energy storage system can not continue discharging, the micro-grid absorbs electric energy from the large power grid to supply power, or the adjustable load is cut off, and the non-renewable energy source is started to generate power so as to ensure the micro-grid to supply power.
Fig. 2 is a schematic diagram of an embodiment of an electronic device according to an embodiment of the present invention. As shown in fig. 2, an embodiment of the present invention provides an electronic device, including a memory 1310, a processor 1320, and a computer program 1311 stored in the memory 1310 and executable on the processor 1320, wherein the processor 1320 executes the computer program 1311 to implement the following methods: if the load is smaller than the sum of the renewable energy source power generation output power in the micro-grid, the micro-grid is powered and charged to the energy storage system by controlling the energy storage converter; when the energy storage system is full, the micro-grid only transmits redundant electric energy to the large power grid or supplies power to the adjustable load;
if the load is greater than the sum of the renewable energy source power generation output power in the micro-grid, the energy storage system is enabled to discharge and supply power by controlling the energy storage converter; if the energy storage system can not continue discharging, the micro-grid absorbs electric energy from the large power grid to supply power, or the adjustable load is cut off, and the non-renewable energy source is started to generate power so as to ensure the micro-grid to supply power.
Fig. 3 is a schematic diagram of an embodiment of a computer readable storage medium according to the present invention. As shown in fig. 3, the present embodiment provides a computer-readable storage medium 1400 on which is stored a computer program 1411, which computer program 1411, when executed by a processor, implements the following method: if the load is smaller than the sum of the renewable energy source power generation output power in the micro-grid, the micro-grid is powered and charged to the energy storage system by controlling the energy storage converter; when the energy storage system is full, the micro-grid only transmits redundant electric energy to the large power grid or supplies power to the adjustable load;
if the load is greater than the sum of the renewable energy source power generation output power in the micro-grid, the energy storage system is enabled to discharge and supply power by controlling the energy storage converter; if the energy storage system can not continue discharging, the micro-grid absorbs electric energy from the large power grid to supply power, or the adjustable load is cut off, and the non-renewable energy source is started to generate power so as to ensure the micro-grid to supply power.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and for those portions of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. The low-carbon energy-saving method for complementary adjustment of multiple energy sources is characterized by comprising the following steps of:
if the load is smaller than the sum of the renewable energy source power generation output power in the micro-grid, the micro-grid is powered and charged to the energy storage system by controlling the energy storage converter; when the energy storage system is full, the micro-grid only transmits redundant electric energy to the large power grid or supplies power to the adjustable load;
if the load is greater than the sum of the renewable energy source power generation output power in the micro-grid, the energy storage system is enabled to discharge and supply power by controlling the energy storage converter; if the energy storage system can not continue discharging, the micro-grid absorbs electric energy from the large power grid to supply power, or the adjustable load is cut off, and the non-renewable energy source is started to generate power so as to ensure the micro-grid to supply power.
2. The multi-energy complementarily tuned low carbon energy conservation method of claim 1, wherein the renewable energy generation is stored to the lithium iron phosphate battery by configuring a customized Battery Management System (BMS) and the lithium iron phosphate battery is grid-connected to a large grid or island operation.
3. The multi-energy complementarily conditioned low carbon energy conservation method of claim 2, wherein the renewable energy source comprises one or more of photovoltaic power generation, wind power generation, or hydro power generation; the large power grid is formed by generating electricity from non-renewable energy sources including one or more of nuclear, gas-fired or coal-fired.
4. The low-carbon energy-saving method for complementary adjustment of multiple energy sources according to claim 1, wherein the on-site environment of renewable energy source power generation is monitored and displayed in real time, daily power generation of each inverter is collected and displayed, the real-time power generation and the historical power generation are compared and analyzed, and the fluctuation condition of the photovoltaic power generation along with the on-site environment is obtained; the site environment comprises sunlight intensity, ambient temperature and wind speed.
5. The low-carbon energy-saving method for complementary adjustment of multiple energy sources according to claim 4, wherein the photovoltaic confluence acquisition device, the direct current detection instrument and the power quality analyzer are respectively applied to the confluence box, the direct current cabinet and the alternating current cabinet aiming at the requirement of power parameter detection of each link of photovoltaic power generation, so as to acquire, monitor, control and adjust the operation parameters and state data of the photovoltaic cells, the confluence box, the direct current cabinet, the inverter and the alternating current cabinet, thereby improving the efficiency of a power generation system.
6. The multi-energy complementarily-regulated low-carbon energy-saving method according to claim 1, wherein the energy storage system is charged when the price of electricity of the large power grid is low; and when the price of the large power grid is high, the energy storage system is discharged for use in the park.
7. The multi-energy complementarily adjusted low-carbon energy-saving method according to claim 1, wherein when the renewable energy source power generation output power is reduced, the energy storage system is started to discharge to assist in matching with the micro-grid power supply;
when the electricity consumption period is in the valley period, the energy storage converter is controlled to enable the micro-grid to supply power and charge the energy storage system, and when the electricity consumption period is in the peak period, the energy storage system is started to discharge to assist in matching with the micro-grid to supply power.
8. A low-carbon energy-saving system with complementary adjustment of multiple energy sources, which is characterized in that the system is used for realizing the low-carbon energy-saving method with complementary adjustment of the multiple energy sources according to any one of claims 1 to 7, and comprises a large power grid, a micro power grid, an energy storage converter and an energy storage system;
if the load is smaller than the sum of the renewable energy source power generation output power in the micro-grid, the micro-grid is powered and charged to the energy storage system by controlling the energy storage converter; when the energy storage system is full, the micro-grid only transmits redundant electric energy to the large power grid or supplies power to the adjustable load;
if the load is greater than the sum of the renewable energy source power generation output power in the micro-grid, the energy storage system is enabled to discharge and supply power by controlling the energy storage converter; if the energy storage system can not continue discharging, the micro-grid absorbs electric energy from the large power grid to supply power, or the adjustable load is cut off, and the non-renewable energy source is started to generate power so as to ensure the micro-grid to supply power.
9. An electronic device comprising a memory, a processor for implementing the steps of the multi-energy complementarily tuned low-carbon power saving method according to any of claims 1-7 when executing a computer management class program stored in the memory.
10. A computer readable storage medium, having stored thereon a computer management class program which when executed by a processor performs the steps of the multi-energy complementarily tuned low carbon energy conservation method according to any one of claims 1 to 7.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117996810A (en) * | 2024-01-23 | 2024-05-07 | 深圳市质点能源科技有限公司 | Micro-grid power supply control method, device and storage medium |
| CN118199166A (en) * | 2024-03-06 | 2024-06-14 | 紫泉能源技术股份有限公司 | Multi-energy complementary power system and electric energy distribution method |
| CN118300185A (en) * | 2024-06-06 | 2024-07-05 | 江苏方程电力科技有限公司 | Intelligent micro-grid control method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117996810A (en) * | 2024-01-23 | 2024-05-07 | 深圳市质点能源科技有限公司 | Micro-grid power supply control method, device and storage medium |
| CN118199166A (en) * | 2024-03-06 | 2024-06-14 | 紫泉能源技术股份有限公司 | Multi-energy complementary power system and electric energy distribution method |
| CN118300185A (en) * | 2024-06-06 | 2024-07-05 | 江苏方程电力科技有限公司 | Intelligent micro-grid control method |
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