CN215419614U - Household solar distributed photovoltaic grid-connected power generation system based on demand side load - Google Patents
Household solar distributed photovoltaic grid-connected power generation system based on demand side load Download PDFInfo
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- CN215419614U CN215419614U CN202121330294.6U CN202121330294U CN215419614U CN 215419614 U CN215419614 U CN 215419614U CN 202121330294 U CN202121330294 U CN 202121330294U CN 215419614 U CN215419614 U CN 215419614U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
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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
Abstract
The utility model discloses a household solar distributed photovoltaic grid-connected power generation system based on demand side load, which comprises a photovoltaic array, a photovoltaic charge controller, a relay switch, a grid-connected inverter, an intelligent gateway and a plurality of storage battery packs, wherein the photovoltaic array is connected with the photovoltaic charge controller; the photovoltaic charging controller and the relay switch are controlled to charge the corresponding storage battery set by recording the power consumption and the charging amount of the storage battery set through the intelligent gateway, the grid-connected inverter is utilized to realize power supply of an alternating current electric appliance, redundant power can be stored or supplied to a power grid, photovoltaic array power generation is utilized to the maximum extent, and the efficiency of the photovoltaic system in power supply of an alternating current and direct current hybrid system is improved.
Description
Technical Field
The utility model relates to the field of solar photovoltaic power generation, in particular to a household solar distributed photovoltaic grid-connected power generation system based on demand side load.
Background
Along with the rapid development of society, the demand of human beings on fossil energy is increasing day by day, and meanwhile, the use of a large amount of fossil energy also brings environmental problems such as acid rain, haze and the like. There is an urgent need for a clean, renewable, clean energy source. Solar energy is used as a clean energy source to enter the public vision.
At present, the development and utilization of solar power sources are increasing in all countries in the world. Solar energy is a renewable energy source, and photovoltaic power generation is one of the main ways of solar energy utilization and development. The system scale of the technology can be large or small, the system is popularized and applied to ordinary families, the advantages of local power generation, local practicability, peak clipping and valley filling, reduction of power transmission loss, local solution and the like can be achieved, and comprehensive economic benefits of the photovoltaic power generation technology can be achieved. The solar photovoltaic power generation system is mainly divided into an independent type and a grid-connected type. The former is mainly used in mountainous areas with difficult power transmission, solar street lamps and other independent power supply occasions, and the latter is mainly used in household residences and large-scale power generation systems. If the common household photovoltaic grid-connected power generation system can be widely used, the problem of energy demand shortage in China can be greatly relieved. Photovoltaic power generation has been used as a supplementary energy source in remote rural and farming-pastoral areas with certain success. With the development of society, large-scale photovoltaic power generation has started to enter people's visual field as a supplementary energy, and photovoltaic power generation has started to be changed to the direction of large-scale grid-connected power generation as an alternative energy.
The grid connection of the photovoltaic power generation system becomes a new important way for solar energy. The full utilization of solar energy opens a new idea for solving the energy problem. The grid-connected photovoltaic power generation system is characterized in that direct current generated by a photovoltaic battery pack is inverted into alternating current with the same frequency and phase as a power grid, and the alternating current side is connected into the power grid. The grid-connected solar photovoltaic power generation system is divided into a grid-connected solar photovoltaic power generation system with an energy storage device and a grid-connected solar photovoltaic power generation system without the energy storage device, wherein the energy storage device is generally a storage battery. The grid-connected photovoltaic power generation system with the energy storage device has adjustability, can be connected to or disconnected from a power grid according to requirements, and can play a role of a standby power supply if the power grid fails and normal power supply cannot be achieved. A photovoltaic grid-connected power generation system with an energy storage device is often arranged on a building roof; grid-connected power generation systems without energy storage devices do not have the functions of adjustability and reserve power and are typically placed on larger plant installations.
The existing household solar photovoltaic power generation system can only realize fixed load power supply and grid connection, cannot reasonably distribute the generated energy of the solar photovoltaic power generation system according to the change of the load on the demand side, and is low in flexibility, so that the power generation efficiency of the solar photovoltaic power generation system is low.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model aims to provide a household solar distributed photovoltaic grid-connected power generation system based on demand side load with high flexibility, improve the power supply efficiency of the photovoltaic system to an alternating current-direct current hybrid system and improve the power generation efficiency of the power generation system.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a household solar distributed photovoltaic grid-connected power generation system based on demand side load comprises a photovoltaic array, a photovoltaic charge controller, a relay switch, a grid-connected inverter, an intelligent gateway and a plurality of storage battery packs;
the photovoltaic charging controller connected with the photovoltaic array is used for controlling the output voltage of the photovoltaic array to meet the charging requirement of the storage battery;
each storage battery pack is connected with the photovoltaic charge controller through a relay switch;
the grid-connected inverter is connected with each storage battery pack and used for supplying power to an alternating current load or accessing an alternating current power grid;
the relay switch is used for switching on and off the circuit according to the instruction of the intelligent gateway, so that the charging control of a specific storage battery pack is realized;
the intelligent gateway is used for recording the power consumption and the charging amount of the storage battery pack and controlling the photovoltaic charging controller and the relay switch to charge the corresponding storage battery pack.
Furthermore, the grid-connected inverter is connected with the electric power grid after being connected with the electric meter.
Further, the grid-connected inverter is connected with a power grid through a grid-connected switch.
Furthermore, the storage battery pack is formed by connecting a plurality of storage batteries in series.
Further, the storage battery is a lithium battery.
Furthermore, the photovoltaic array is composed of a plurality of photovoltaic modules arranged on the solar panel.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model is a grid-connected household photovoltaic power generation grid-connected system with a storage battery, when the sunlight intensity is stronger in the daytime, a solar battery pack provides power for a grid-connected inverter through a photovoltaic charge controller, and finally, an alternating current load is supplied, so that the power consumption in the daytime is less, and redundant electric energy is stored in the storage battery pack or sold to a power grid; when weather conditions are poor or night, the storage battery pack can provide power for the grid-connected inverter through the photovoltaic charging controller, and finally alternating current load is supplied, if the electric energy of the storage battery is not enough to meet the alternating current load, the storage battery pack can be switched to a power grid for power supply, and the power generation system has higher reliability and flexibility. The photovoltaic charging controller and the relay switch are controlled to charge the corresponding storage battery set by recording the power consumption and the charging amount of the storage battery set through the intelligent gateway, the grid-connected inverter is utilized to realize power supply of the alternating current electric appliance, redundant power can be stored or supplied to a power grid, photovoltaic array power generation is utilized to the maximum extent, and the efficiency of the photovoltaic system in power supply of the alternating current and direct current hybrid system is improved.
The photovoltaic charging controller tracks the highest power point while realizing safe charging so as to improve the generating efficiency of the photovoltaic array; electric quantity forecasting and electric quantity distribution are achieved through the intelligent gateway based on the demand side load, and the power supply demand is met while the cost and the efficiency of the storage battery pack are guaranteed.
The utility model discloses a plurality of storage battery can realize the direct current electrical apparatus power supply to different rated voltage through the series connection of battery, and the practicality is stronger.
The utility model designs a solar energy distribution grid-connected power generation system with the purpose of power consumption demand of users, utilizes the characteristics of clean and pollution-free power generation by taking solar energy as new energy, combines energy storage and intelligent photovoltaic control technologies, finally builds an intelligent photovoltaic system which integrates light, storage and use, coordinates and stably operates, and can be smoothly connected with a mains supply system in a networking mode; surplus electric power can be uploaded to the power grid, insufficient electric power is automatically supplemented by the power grid and mutually stands by, a high-quality power supply is provided for power loads, the practicability, reliability and economy of the distributed intelligent photovoltaic system are displayed, and the problem of energy demand shortage in China can be greatly relieved.
Drawings
FIG. 1 is a grid-connected schematic diagram of a solar distributed photovoltaic power generation system of the utility model
FIG. 2 is a flow chart of the prediction of power consumption of the intelligent gateway of the present invention
FIG. 3 is a flow chart of the demand side management of the present invention
Detailed Description
The present invention will be explained in further detail with reference to examples.
As shown in fig. 1, the solar distributed photovoltaic power generation system based on the smart grid of the present invention includes a photovoltaic array, a photovoltaic charge controller, a relay switch, a grid-connected inverter, a storage battery, and a smart gateway; the photovoltaic array, the photovoltaic charge controller, the relay switch, the grid-connected inverter and the storage battery jointly form a distributed photovoltaic grid-connected power generation system;
the output of the photovoltaic array is connected with a photovoltaic charge controller, on one hand, the photovoltaic charge controller controls the output voltage of the photovoltaic array to meet the charging requirement of a storage battery, and on the other hand, the photovoltaic charge controller tracks the maximum power point to improve the generating efficiency of the photovoltaic array;
the intelligent gateway has three functions: the function is to record the power consumption and charge of each storage battery pack and store the power consumption and charge in a database; the second function is to forecast the electric quantity according to the information in the database; and the third function is to guide the photovoltaic charge controller and the relay switch to reasonably distribute the electric quantity based on the forecast information and the current states of all storage battery packs, so that the cost and the efficiency of the storage battery packs are ensured, and meanwhile, the power supply requirement is met. And the intelligent gateway makes a charging decision by combining the predicted power consumption and the current storage capacity of each storage battery pack, and controls a relay switch to charge the corresponding storage battery pack.
The storage batteries are connected in series to supply power to the direct current electric appliances with different rated voltages;
and the relay switch is used for switching on and off the circuit according to the instruction of the intelligent gateway so as to realize the charging control of the specific storage battery pack.
The grid-connected inverter is connected with the power grid after being connected with the ammeter, the electric quantity sold to the power grid is recorded through the ammeter, the grid-connected inverter is connected with the power grid through the grid-connected switch, and the on-off of the grid-connected inverter and the power grid is controlled in real time through the grid-connected switch.
The storage battery pack is formed by serially connecting a plurality of lithium batteries and is suitable for power consumption requirements of different voltage loads, and the photovoltaic array is composed of a plurality of photovoltaic modules arranged on the solar panel, is convenient to install and is suitable for household use.
The intelligent power grid aims at the electric quantity on the user demand side, and the household residential user electricity utilization management system is combined with the electricity price information of a power company to meet the user power supply demand on the premise that the intervention of a solar distributed photovoltaic power generation system and the user electricity utilization load prediction are reliable. Recording and storing the power consumption and the charging amount of each storage battery pack, and forecasting the electric quantity according to the information of the power consumption and the charging amount; meanwhile, the relay switch is guided to reasonably distribute the electric quantity based on the forecast information and the current states of all storage battery packs, so that the cost and the efficiency of the storage battery packs are ensured, and meanwhile, the power supply requirement is met.
Each group of storage batteries is connected with a photovoltaic charge controller, the photovoltaic charge controller charges the storage battery pack under the control of the intelligent gateway, and the photovoltaic charge controller performs highest power point tracking while realizing safe charging so as to improve the power generation efficiency of the photovoltaic array; wherein: the storage battery packs are connected in series to supply power to direct-current electric appliances with different rated voltages, and meanwhile, a grid-connected inverter is used for supplying power to alternating-current electric appliances; recording and storing the power consumption and the charging amount of each storage battery pack by adopting an intelligent gateway, and forecasting the electric quantity according to the information of the power consumption and the charging amount; meanwhile, the relay switch is guided to reasonably distribute the electric quantity based on the forecast information and the current states of all storage battery packs, so that the cost and the efficiency of the storage battery packs are ensured, and meanwhile, the power supply requirement is met.
As shown in fig. 2, which is a flowchart for predicting power consumption of the intelligent gateway, the intelligent gateway collects power supply amount of each storage battery pack and electric quantity obtained from the photovoltaic charge controller in real time through a power carrier communication manner, so as to obtain the storage capacity of the storage battery pack. Meanwhile, the intelligent gateway obtains current weather information (including air temperature, precipitation, time, holiday information, season information and week information) through the world wide web, and stores the current weather information and the electricity utilization information of the storage battery pack, wherein the data storage time is four weeks, and the specific storage time can also be set according to actual needs. According to the historical data, the intelligent gateway performs multivariate linear regression on the historical data, an F test method is utilized to obtain explanation variables related to the power consumption, and then the explanation variables are used as learning data to establish a neural network model to obtain a final power consumption prediction model.
Further, a specific implementation method of the intelligent grid-connected photovoltaic system based on the neural network power consumption prediction is described below.
As shown in fig. 2, the intelligent gateway power consumption prediction process:
(1) acquiring the power consumption of each user through an intelligent gateway, and storing the data and corresponding weather information (including temperature, precipitation, time, holiday information, season information and week information) in a database as historical data;
(2) performing linear regression by taking weather information as an explanation variable and historical data of one week as learning data;
(3) using an F test method to eliminate irrelevant explanatory variables;
(4) carrying out neural network learning by taking the effective explanation variable as input to obtain a power consumption prediction model;
(5) and according to the current weather information, reasonably distributing the generated energy of the solar photovoltaic grid-connected system by using the power consumption model obtained in the previous step.
As shown in fig. 3, the electricity distribution flow of the demand side management:
(1) and aiming at the power demand of a user, effectively distributing the household solar distributed photovoltaic grid-connected generating capacity according to the predicted power consumption.
(2) When weather conditions are good or in the daytime, the generating capacity of the solar photovoltaic panel is larger than the power consumption demand of a user, the generating capacity can meet the load of the user, and redundant electric quantity is supplied to the storage battery.
(3) If the storage capacity of a certain storage battery pack is larger than the ideal storage capacity at the current moment, the intelligent gateway issues an instruction to close a corresponding relay switch to stop charging the storage battery pack, and the redundant electric quantity is sold to the power grid;
(4) when weather conditions are poor or night, the storage battery can provide power for the grid-connected inverter through the photovoltaic charge controller, and finally, the power is supplied to an alternating current load;
the utility model is characterized in that:
(1) performing optimal configuration of the generated energy of the solar distributed photovoltaic grid-connected power generation system according to the power demand of a user;
(2) when the solar radiation intensity is strong and the power generation quantity of the photovoltaic panel is larger than the requirement of a user load, the redundant power is stored in the storage battery, and when the storage battery is fully charged, the redundant power is sold to a power grid;
(3) when the solar radiation intensity is weak or at night, the electric quantity of the storage battery is supplied to the requirement of the user load, and when the electric quantity of the storage battery cannot meet the requirement of the user load, the rest electric quantity needs to be bought from the power grid.
Claims (6)
1. The utility model provides a domestic solar energy distribution photovoltaic grid-connected power generation system based on demand side load which characterized in that: the system comprises a photovoltaic array, a photovoltaic charge controller, a relay switch, a grid-connected inverter, an intelligent gateway and a plurality of storage battery packs;
the photovoltaic charging controller connected with the photovoltaic array is used for controlling the output voltage of the photovoltaic array to meet the charging requirement of the storage battery;
each storage battery pack is connected with the photovoltaic charge controller through a relay switch;
the grid-connected inverter is connected with each storage battery pack and used for supplying power to an alternating current load or accessing an alternating current power grid;
the relay switch is used for switching on and off the circuit according to the instruction of the intelligent gateway, so that the charging control of a specific storage battery pack is realized;
the intelligent gateway is used for recording the power consumption and the charging amount of the storage battery pack and controlling the photovoltaic charging controller and the relay switch to charge the corresponding storage battery pack.
2. The demand side load based domestic solar distributed grid-connected photovoltaic power generation system of claim 1, wherein: and the grid-connected inverter is connected with the electric power grid after being connected with the electric meter.
3. The demand side load based domestic solar distributed grid-connected photovoltaic power generation system of claim 1, wherein: and the grid-connected inverter is connected with a power grid through a grid-connected switch.
4. The demand side load based domestic solar distributed grid-connected photovoltaic power generation system of claim 2 or 3, wherein: the storage battery pack is formed by connecting a plurality of storage batteries in series.
5. The demand side load based domestic solar distributed grid-connected photovoltaic power generation system of claim 4, wherein: the storage battery is a lithium battery.
6. The demand side load based domestic solar distributed grid-connected photovoltaic power generation system of claim 4, wherein: the photovoltaic array is composed of a plurality of photovoltaic modules arranged on the solar panel.
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| CN202121330294.6U CN215419614U (en) | 2021-06-15 | 2021-06-15 | Household solar distributed photovoltaic grid-connected power generation system based on demand side load |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115864519A (en) * | 2023-01-17 | 2023-03-28 | 大秦新能源科技(泰州)有限公司 | Household power generation and energy storage system and use method |
| CN116667538A (en) * | 2023-07-24 | 2023-08-29 | 常州思瑞电力科技有限公司 | Electricity consumption management system of household photovoltaic power station |
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2021
- 2021-06-15 CN CN202121330294.6U patent/CN215419614U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115864519A (en) * | 2023-01-17 | 2023-03-28 | 大秦新能源科技(泰州)有限公司 | Household power generation and energy storage system and use method |
| CN115864519B (en) * | 2023-01-17 | 2024-01-26 | 大秦新能源科技(泰州)有限公司 | Household power generation and energy storage system and use method |
| CN116667538A (en) * | 2023-07-24 | 2023-08-29 | 常州思瑞电力科技有限公司 | Electricity consumption management system of household photovoltaic power station |
| CN116667538B (en) * | 2023-07-24 | 2023-09-29 | 常州思瑞电力科技有限公司 | Electricity consumption management system of household photovoltaic power station |
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