CN108377001B - Photovoltaic energy storage system and method for peak clipping and valley filling of electricity consumption - Google Patents
Photovoltaic energy storage system and method for peak clipping and valley filling of electricity consumption Download PDFInfo
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- CN108377001B CN108377001B CN201810370324.2A CN201810370324A CN108377001B CN 108377001 B CN108377001 B CN 108377001B CN 201810370324 A CN201810370324 A CN 201810370324A CN 108377001 B CN108377001 B CN 108377001B
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- 230000005611 electricity Effects 0.000 title claims abstract description 35
- 238000004146 energy storage Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 8
- 238000010248 power generation Methods 0.000 claims abstract description 23
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000008030 elimination Effects 0.000 description 9
- 238000003379 elimination reaction Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 239000013589 supplement Substances 0.000 description 5
- 230000003631 expected effect Effects 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H02J3/383—
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/20—Climate change mitigation technologies for sector-wide applications using renewable energy
Abstract
The invention discloses a photovoltaic energy storage system and a method for peak clipping and valley filling of electricity consumption, comprising the following steps: the system comprises a solar cell panel, an inverter, a storage battery unit, a combiner box, a data collector, a controller and a grid-connected cabinet. The data acquisition device acquires power generation data of the solar panel, acquires electric quantity data of the storage battery and acquires power consumption data of the power utilization system of the factory, and feeds back the power generation data, the electric quantity data and the power consumption data to the controller in real time; the controller is used for controlling and coordinating the solar panel and the storage battery unit to supply power to the factory power grid together in peak time periods and controlling the storage battery unit to charge and guarantee that the electric quantity is in a saturated state in valley time periods based on the power generation data, the electric quantity data and the power consumption data. Through reasonable layout of the solar cell panel and the storage battery unit, the photovoltaic energy storage system achieves the effects of eliminating peaks and filling valleys.
Description
Technical Field
The invention relates to the field of application of photovoltaic power generation systems, in particular to a photovoltaic energy storage system and a photovoltaic energy storage method for peak clipping and valley filling of electricity consumption.
Background
The large difference in the power loads between the peak and valley periods presents significant difficulties in the generation and scheduling of electrical energy. In order to reduce the huge difference of electricity demand in peak-to-valley electricity periods, the local issuing and changing commission and the power grid company release policies of peak-to-valley electricity difference electricity price, the peak-to-valley electricity difference of general industrial and commercial electricity consumption in Beijing, jiangsu reaches 1 yuan/kWh, and the peak-to-valley electricity difference of general industrial and commercial electricity consumption in Shanghai, guangdong, tianjin and other places exceeds 0.8 yuan/kWh. For large industrial electricity, the peak-to-valley electricity price difference of Shanghai, jiangsu, guangdong, hainan, jiangxi, henan and other places exceeds 0.65 yuan/kWh.
While the peak-valley electricity gap is pulled, the country also develops demand side response service test points in five cities of Beijing, tangshan, buddha mountain, suzhou and Shanghai, and provides financial assistance for actively responding to user units applying electric load scheduling in the peak electricity utilization period.
The electric energy has the characteristic of keeping instantaneous balance between supply and demand, but because of the periodic high-low fluctuation rule of the load of the power grid and the generation of new energy, the energy storage system is required to carry out the balance adjustment of the supply and demand of the electric power no matter in the load valley period of the power grid or the capacity output of the smooth new energy generation. The construction of the energy storage power station can bring the following social benefits on the power supply level.
And (3) power smoothing: the impact of the intermittence and fluctuation of renewable energy sources on a power grid is solved, and the power supply quality of the power grid is improved;
energy consumption: solves the problems of wind discarding, light discarding, water discarding, fuel discarding and the like;
supply-demand balance: the contradiction between supply and demand of electric energy is relieved, frequency modulation, peak regulation, emergency, peak clipping and valley filling are realized, and the energy utilization rate is improved.
The power supply is reliable: and a backup power supply is provided, so that the safety of power supply of a power grid is improved, and the most important barrier of energy safety is realized.
Aiming at various defects of the traditional energy storage photovoltaic power station, a new technology for eliminating peak and filling valley by using a photovoltaic energy storage system is required to be developed, and the energy storage photovoltaic system capable of completely eliminating the peak-time electric quantity of a factory area is required to be developed.
The solar cell panel and the storage battery are reasonably arranged in the factory, so that the power consumption of the peak-to-average period of the factory is met, the peak-to-average power consumption of the power grid is zero, and the power consumption cost of the factory is reduced.
Disclosure of Invention
The invention aims to solve the problems of high power consumption price in factories and difficult peak regulation of power grids. The invention aims to provide a photovoltaic energy storage system and a method for peak clipping and valley filling of electricity consumption.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a photovoltaic energy storage system for peak clipping and valley filling of electricity consumption, comprising: solar cell panel, dc-to-ac converter, battery cell, collection flow box, data acquisition ware, controller, and cabinet that is incorporated into power networks, wherein: the solar cell panel is connected into the junction box through the inverter; the storage battery unit is directly connected to the junction box; the solar cell panel and the storage battery unit are connected to a factory power grid through the junction box; the data acquisition device acquires power generation data of the solar panel, acquires electric quantity data of the storage battery and acquires power consumption data of a factory power utilization system, and feeds back the power generation data, the electric quantity data and the power consumption data to the controller in real time; the controller controls and coordinates the solar panel and the storage battery unit to supply power to a factory power grid together in a peak period based on the power generation data, the electric quantity data and the power consumption data acquired by the data acquisition unit, and controls the storage battery unit to charge and ensure that the electric quantity is in a saturated state in a valley period, wherein the peak period refers to a power consumption peak period, and the valley period refers to a power consumption valley period with low electricity price.
Further, in other periods except the peak period and the valley period, the controller controls the photovoltaic electric quantity generated by the solar panel to be preferentially supplied to a factory for consumption, the inexhaustible residual electric quantity is supplied to a storage battery unit for charging, and the inexhaustible residual electric quantity is stored in a storage battery pack of the storage battery unit and is not returned to a factory power grid.
And setting the installed capacity of the solar panel and the installed capacity of the storage battery unit according to the peak normal power consumption of the factory.
The storage battery unit comprises a plurality of storage battery packs, and can realize charging and discharging at the same time.
Through reasonable layout of the solar cell panel and the storage battery unit, the photovoltaic energy storage system achieves the expected effect of peak load elimination.
Compared with the traditional photovoltaic energy storage system, the invention can realize a plurality of advantages: firstly, the installed capacity of a solar panel and the installed capacity of a storage battery are reasonably distributed according to the peak-to-average power consumption of a factory, the capacity maximization of a solar panel system is guaranteed, the solar panel system generates clean electric energy through a photovoltaic effect and supplies power to the factory, when the power supply of the solar panel system is insufficient, the power of the storage battery is supplemented by the power of the storage battery, and the power of the storage battery is supplemented by a night valley period, so that the peak-to-average power consumption of the factory is completely provided by the solar panel system and the storage battery (as shown in a figure I); secondly, clean power generated by the solar cell system is supplied to factories for use, and residual power is stored in a storage battery and is not returned to a power grid; thirdly, the storage battery pack is divided into a plurality of units, so that charging and discharging can be realized, the impact of the intermittence and fluctuation of renewable energy sources on a power grid is solved, and the power supply quality of the power grid is improved; fourthly, peak and valley elimination of the national electric network (shown in figure 2) can be greatly promoted, the contradiction between supply and demand of electric energy is relieved, frequency modulation, peak regulation, emergency, peak clipping and valley filling are realized, and the energy utilization rate is improved.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings.
FIG. 1 is a diagram of power system electricity demand;
fig. 2 is a schematic diagram of a photovoltaic energy storage system according to the present invention, wherein 1 is a solar panel, 2 is an inverter, 3 is a storage battery unit, 4 is a combiner box, 5 is a data collector, 6 is a controller, 7 is a factory grid, and 8 is a grid-connected cabinet;
FIG. 3 is a schematic diagram of plant area power consumption clipping;
fig. 4 is a schematic diagram of peak clipping and valley filling of a power grid.
Detailed Description
The technical scheme of the invention is specifically described below with reference to the attached drawings.
FIG. 1 is a diagram of power demand for an electrical power system
Fig. 2 is a schematic diagram of a photovoltaic energy storage system according to the present invention.
As shown in fig. 2, the photovoltaic energy storage system for peak clipping and valley filling of electricity consumption according to the present invention includes: solar cell panel (1), dc-to-ac converter (2), battery cell (3), collection flow box (4), data collection ware (5), controller (6), and cabinet (8) are incorporated into the power networks, wherein: the solar cell panel is connected into the junction box through the inverter; the storage battery unit is directly connected to the junction box; the solar cell panel and the storage battery unit are connected to a factory power grid through the junction box; the data acquisition device acquires power generation data of the solar panel, acquires electric quantity data of the storage battery and acquires power consumption data of a factory power utilization system, and feeds back the power generation data, the electric quantity data and the power consumption data to the controller in real time; the controller controls and coordinates the solar panel and the storage battery unit to supply power to a factory power grid together in a peak period based on the power generation data, the electric quantity data and the power consumption data acquired by the data acquisition unit, and controls the storage battery unit to charge and ensure that the electric quantity is in a saturated state in a valley period, wherein the peak period refers to a power consumption peak period, and the valley period refers to a power consumption valley period with low electricity price.
According to the invention, the storage battery unit is charged by the power grid at night valley time, the power of the photovoltaic system and the storage battery unit are used for supplying power to the factory during daytime peak time, and the high-price peak power consumption of the factory is eliminated.
The invention is characterized in that the installed capacity of the solar panel is based on the highest hour power consumption of a factory area under the condition of sufficient roof resources, the solar panel is installed, and the residual peak period power consumption is the capacity of a storage battery unit; under the condition of insufficient roof resources, the residual peak period consumed electric quantity is the capacity of the storage battery unit based on the installed capacity of the covered effective area.
The data collector is characterized by being capable of collecting power generation data of the solar panel, collecting electric quantity data of the storage battery and collecting power consumption data of a factory power utilization system.
The controller provided by the invention controls the storage battery to charge in the valley period and ensures that the electric quantity is in a saturated state by collecting the electric quantity data of the storage battery.
The invention utilizes the data collector to collect the power consumption of the factory, the photovoltaic power and the residual power of the storage battery, and supplements the power for the storage battery in the valley period through the controller coordination system, so as to ensure that the power of the storage battery is in a saturated state; the power supply system is characterized in that the power required by the factory is fed back through the collector in the peak period, the photovoltaic system and the power storage unit are coordinated to supply power to the factory, and the peak power consumption of the factory is eliminated; and in other periods, the photovoltaic electric quantity is preferentially supplied to the factory to be consumed, and the part which is not consumed is supplied to the storage battery unit to be charged.
The invention solves the problems of high power consumption price and difficult peak regulation of the power grid in the factory, fully utilizes the photovoltaic energy storage system, and achieves the expected effect of peak elimination and valley filling through reasonable layout of the solar cell panel and the storage battery unit.
FIG. 3 is a schematic diagram of plant area power consumption clipping. In fig. 3, S1 is a photovoltaic power generation amount curve, S2 is a power consumption amount curve before peak elimination in a factory, and S3 is a power consumption amount curve after peak elimination in the factory.
In the photovoltaic power generation amount curve S1, the photovoltaic power generation amount increases along with the increase of the irradiation amount, the photovoltaic power generation amount starts to increase from eight morning points, the noon is in the strongest state, the noon falls back, the power generation is stopped at five afternoon, and the power generation amount can be supplied to the power consumption in the daytime of the factory.
The power consumption curve S2 before the peak elimination of the factory is a simulated factory power consumption curve.
The power consumption curve S3 after peak elimination in the factory is a curve effect after peak elimination by using a photovoltaic energy storage system, wherein the Q1 area is a national grid valley period, and the storage battery unit is charged by using low-price electricity of the national grid, so that the sufficient electricity quantity of the storage battery unit is ensured; the Q2 area is the peak morning period, when the photovoltaic electric quantity is smaller than the consumption of a factory, the electric quantity of the storage battery unit is utilized to supplement the electric quantity of the photovoltaic system so as to meet the electric quantity requirement of the peak factory period; when the photovoltaic electric quantity is more than the consumption of a factory, the Q3 and Q4 areas are used for supplementing the electric quantity of the storage battery, and when the electric quantity of the storage battery unit is sufficient, the electric quantity is reversely fed into a power grid; q5 is the afternoon peak period, when the photovoltaic electric quantity is smaller than the consumption of a factory, the electric quantity of the storage battery unit is utilized to supplement the electric quantity of the photovoltaic system so as to meet the electric quantity requirement of the peak period of the production area; q6 is a night valley period, and the low-price electricity of the national power grid is used for supplementing electricity for the storage battery unit.
In the comprehensive view, the electricity consumption of the factory valley period after peak elimination can be increased, and the electricity consumption of the peak period is zero, so that the effect of eliminating the high-price peak electricity for the factory is achieved.
Fig. 4 is a schematic diagram of peak clipping and valley filling of a power grid. As shown in fig. 4, the electric quantity at night valley period is used as the storage battery to store the electric quantity, the electric quantity is released and output during peak period in daytime, and the peak-time electric quantity of a factory can be guaranteed to be zero by combining the clean electric power generated by the photovoltaic system, so that the load pressure of the peak period of the power grid is greatly reduced, and the peak-load-eliminating requirement of the national power grid is met.
According to the embodiment of the invention, the system comprises a solar panel, an inverter, a combiner box, a storage battery unit, a collector, a controller, a grid-connected cabinet and other devices required by the system. The installed capacities of the solar cell panel and the storage battery unit are required to meet the electricity consumption of the factory peak period; the collector feeds back the electric quantity information to the controller in real time through collecting information of the inverter, the storage battery unit, the combiner box, the factory power grid and the like, and then the controller controls the photovoltaic system to supply electric energy to the factory, controls charging and discharging of the storage battery unit and the like.
Under the condition that roof resources are sufficient, the installed capacity of the solar panel is based on the highest hour power consumption of a factory, and the residual peak period power consumption is the capacity of a storage battery unit; under the condition of insufficient roof resources, the residual peak period consumed electric quantity is the capacity of the storage battery unit based on the installed capacity of the covered effective area.
The clean power generated by the photovoltaic system is preferentially supplied to the factory to be consumed, the controller which is not consumed controls the storage of the storage battery unit, and if the storage battery unit is in a saturated state, the storage battery unit is sent to the power grid.
The storage battery unit supplements electric quantity to saturation by utilizing the power grid in a night valley period, supplements electric quantity of the photovoltaic system in a daytime peak period, supplies power for a load in a factory, and stores the electric quantity in the storage battery when the generated energy of the photovoltaic system is not consumed in other times.
While the invention has been described with reference to the present specific embodiments, those skilled in the art will recognize that the above embodiments are for illustration only and not for limitation, and that various equivalent changes or substitutions may be made without departing from the spirit of the invention, and therefore, all changes and modifications to the embodiments described above will be within the scope of the appended claims.
Claims (4)
1. A photovoltaic energy storage system for electricity consumption peak clipping fills out a valley, its characterized in that: the system comprises a solar panel, an inverter, a storage battery unit, a combiner box, a data collector, a controller and a grid-connected cabinet, wherein:
the solar cell panel is connected into the junction box through the inverter;
the storage battery unit is directly connected to the junction box;
the solar cell panel and the storage battery unit are connected to a factory power grid through the junction box;
the data acquisition device acquires power generation data of the solar panel, acquires electric quantity data of the storage battery and acquires power consumption data of a factory power utilization system, and feeds back the power generation data, the electric quantity data and the power consumption data to the controller in real time;
the controller controls the solar panel and the storage battery unit to supply power to a factory power grid together in peak time periods and controls the storage battery unit to charge and ensure that the electric quantity is in a saturated state in valley time periods based on the power generation data, the electric quantity data and the power consumption data acquired by the data acquisition unit,
wherein the peak period refers to a power consumption peak period, and the valley period refers to a power consumption valley period of low electricity price;
in other periods except the peak period and the valley period, the controller controls the photovoltaic electric quantity generated by the solar panel to be preferentially supplied to a factory for consumption, and the residual electric quantity which is not consumed is supplied to a storage battery unit for charging and stored in a storage battery pack of the storage battery unit and is not returned to a factory power grid;
and setting the installed capacity of the solar panel and the installed capacity of the storage battery unit according to the peak normal power consumption of the factory.
2. The photovoltaic energy storage system of claim 1, wherein: the storage battery unit comprises a plurality of storage battery packs, and realizes charging and discharging at the same time.
3. A peak clipping and valley filling method for electricity consumption by using a photovoltaic energy storage system is characterized in that: the photovoltaic energy storage system comprises a solar cell panel, an inverter, a storage battery unit, a combiner box, a data collector, a controller and a grid-connected cabinet, wherein: the solar panel is coupled with the junction box through the inverter; the storage battery unit is directly coupled with the junction box; the solar cell panel and the storage battery unit are connected to a factory power grid through the junction box, and the method comprises the following steps:
collecting power generation data of a solar cell panel, electric quantity data of a storage battery and power consumption data of a factory power system by using the data collector, and feeding back the power generation data, the electric quantity data and the power consumption data to the controller in real time;
based on the power generation data, the electric quantity data and the power consumption data acquired by the data acquisition unit, the controller controls and coordinates the solar panel and the storage battery unit to supply power to a factory power grid together in a peak period and controls the storage battery unit to charge and ensure that the electric quantity is in a saturated state in a valley period,
wherein the peak period refers to a power consumption peak period, and the valley period refers to a power consumption valley period of low electricity price;
in other periods except the peak period and the valley period, the controller controls the photovoltaic electric quantity generated by the solar panel to be preferentially supplied to a factory for consumption, and the residual electric quantity which is not consumed is supplied to a storage battery unit for charging and stored in a storage battery pack of the storage battery unit and is not returned to a factory power grid;
and setting the installed capacity of the solar panel and the installed capacity of the storage battery unit according to the peak normal power consumption of the factory.
4. The method for peak clipping and valley filling using electricity consumption of a photovoltaic energy storage system according to claim 3, wherein: the storage battery unit comprises a plurality of storage battery packs, and realizes charging and discharging at the same time.
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| CN110690722B (en) * | 2019-09-19 | 2024-01-02 | 深圳市朝阳辉电气设备有限公司 | Photovoltaic energy storage grid-connected power generation system and operation method thereof |
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