KR102118355B1 - Prosumer Energy trading Method Using Energy Storage System for home use - Google Patents

Abstract

The present invention relates to a prosumer energy transaction method using a home energy storage device, wherein the prosumer energy transaction method using a home energy storage device is an energy storage step in which power generated from a home solar power generation device is stored in a home energy storage device. , An energy consumption step of consuming power stored in the household energy storage device in the home through the energy storage step, and a transmission step in which excess power remaining in the household energy storage device is transmitted to a large-capacity energy storage device after the energy consumption step, A primary supply step in which power stored in the large-capacity energy storage device is supplied to the general household through the power transmission step, and surplus power after the primary supply step is at least one of an electric vehicle charging station or a power system. Including the secondary supply step supplied to the present invention, therefore, the present invention is economical by allowing the surplus power consumed in the home among the power generated from the photovoltaic device through the power trading platform to be sold to the enterprise and general consumers. It has an effective effect.

Description

Prosumer Energy trading Method Using Energy Storage System for home use}

The present invention is installed in connection with a home solar power generation device, and stores surplus power consumed and consumed in the home among the power generated from the solar power generation device, and allows the surplus power to be sold to businesses and general consumers. It relates to a prosumer energy trading method using an energy storage device.

In Korea, based on national policies, the development of energy storage devices has been progressed according to national-level plans, such as “power supply and demand plan” and “energy basic plan,” especially producing less than 1,000 km of renewable energy generation facilities. It was revised so that a single electricity could be traded with an electricity supplier without going through the electricity market, and the institutional foundation of the energy prosumer business was prepared.

Accordingly, in recent years, various attempts have been made to efficiently use limited energy resources, and this is a method for differentiating energy prices according to the production or consumption of energy, such as a smart grid or a smart meter. Such technologies are in a trend to be implemented.

Accordingly, the importance of an energy storage device (ESS) is emerging as an essential device for storing unstable generation energy during solar power generation and stably supplying it back to the power system when necessary.

However, such an increase in distributed generation resources and an increase in management targets increases the complexity of the operation of the power system, impairs the stability of the power system in the micro grid, and causes a waste factor, thereby reducing the efficiency of the entire system. There is a need for a technical complementary system.

Republic of Korea Registered Patent Publication, Registration No. 10-1757802 Republic of Korea Registered Patent Publication, Registration No. 10-1756511

The present invention has been devised to solve this problem, and utilizes an energy storage device for a home photovoltaic device, so that surplus power consumed and consumed in the home among the power generated from the photovoltaic device can be sold to companies and general consumers. It relates to a prosumer energy transaction method using a home energy storage device.

The present invention relates to a prosumer energy transaction method using a home energy storage device, wherein the prosumer energy transaction method using a home energy storage device is an energy storage step in which power generated from a home solar power generation device is stored in a home energy storage device. , An energy consumption step of consuming power stored in the household energy storage device in the home through the energy storage step, and a transmission step in which excess power remaining in the household energy storage device is transmitted to a large-capacity energy storage device after the energy consumption step, A primary supply step in which power stored in the large-capacity energy storage device is supplied to the general household through the power transmission step, and surplus power after the primary supply step is at least one of an electric vehicle charging station or a power system. It characterized in that it comprises a secondary supply step is supplied to.

In addition, the power trading platform is connected to a plurality of household energy storage devices, receives surplus power for each household and stores it, and supplies the stored power to at least one or more of general households, electric vehicle charging stations, and power systems. It is characterized by.

In addition, the transaction of power stored in the large-capacity energy storage device is characterized in that it is implemented in a P2P method using a blockchain.

Therefore, the present invention has a remarkable effect on solving the problem of instability of power supply of solar energy by storing power generated irregularly by utilizing an energy storage device.

In addition, through the power trading platform, it is possible to sell surplus power consumed in the home among the power generated from the photovoltaic power generation device to businesses and general consumers, which is economically effective.

1 is a block diagram of the prosumer energy trading system of the present invention.
Figure 2 is a flow chart of the energy transaction method of the present invention.
3 is a block diagram of a prosumer energy trading system, according to an embodiment of the present invention.
Figure 4 is a block diagram of the power trading platform of the present invention.
Figure 5 is a schematic block diagram of the energy storage device of the present invention.
Figure 6 is a detailed view of the battery pack of the energy storage device of the present invention.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings.

However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains. It is provided to completely inform the person having the scope of the invention, and the present invention is only defined by the scope of the claims.

In addition, the terminology used herein is for describing the embodiments and is not intended to limit the present invention.

In the present specification, the singular form also includes the plural form unless otherwise specified in the phrase. As used herein, "comprises" and/or "comprising" does not exclude the presence or addition of other components than those mentioned.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used as meanings commonly understood by those skilled in the art to which the present invention pertains.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

1 is a block diagram of a prosumer energy trading system according to an embodiment of the present invention, FIG. 3 is a block diagram of a prosumer energy trading system, FIG. 5 is a schematic block diagram of an energy storage device of the present invention, and FIG. 6 is a detailed view of a battery pack of the energy storage device of the present invention.

The present invention is a technology that consumes the power generated by the photovoltaic device 100 installed in the home in the home, and stores and utilizes the surplus power in the home energy storage device 200. It is to apply the energy prosumer business between 200).

In more detail, the present invention is installed to be connected to the photovoltaic device 100 that generates power from sunlight, and a household energy storage device that receives and stores the power generated from the photovoltaic device 100 ( 200), and a prosumer power transaction method that enables the sale of surplus power to companies and general consumers by utilizing the home energy storage device 200.

The energy storage system (ESS) 200 is not only charged with receiving power from the photovoltaic power generation device 100 but also supplies power to a load when necessary, and the home energy storage device 200 The battery 210 is a storage device for storing power, a battery management system (BMS) for controlling charge and discharge of the battery, and a bidirectional power conversion device for charging or discharging the battery. (PCS, Power Conversion System) 230.

The battery receives electrical energy from the photovoltaic device 100 and stores and supplies power to a load. The battery may include a battery module or a battery pack including a plurality of battery cells.

In the present invention, as an embodiment of the battery 210, a cylindrical lithium-ion battery was used as a battery pack. The lithium-ion battery is a type of secondary battery, and has high energy density, high energy storage efficiency, and when not in use. It has the advantage that the degree of natural discharge occurs is small and has little memory effect (the effect of reducing the capacity of the battery during the charge/discharge process). In the present invention, the standardized cylindrical lithium ion secondary battery was applied to secure energy storage stability. .

Meanwhile, the battery management unit 220 (hereinafter referred to as'BMS') serves to control battery cells that may have different characteristics, and the BMS allows battery cells to be safely used while exhibiting maximum performance. It serves to control the battery cells.

In the present invention, by including a BMS for each battery module, it is easy to adjust the load added when the power is exchanged.

In addition, in the present invention, by establishing a CAN communication network between the battery modules, it improved the reliability of the battery module.

Meanwhile, the power conversion device 230 (hereinafter referred to as'PCS') converts power characteristics in both directions, and the household energy storage device 200 discharges power during the day when the power demand is high and demands power. It charges power at night when it is low, so during the day, power conversion is needed to transmit from a DC battery to an AC power system, and at night, power conversion is required to charge a DC battery from an AC power system at night. It will be provided with a PCS (230) for converting power in both directions.

In addition, the PCS 230 not only converts AC and DC power into DC and AC, but also controls electric quality, monitors voltage measurement and operation status in real time, and serves to block the cause of failure. The PCS may be equipped with a PMS (Power Management System).

In addition, in the present invention, by applying MPPT (240) (Maximum Power Point Tracking; maximum power tracking), the power is output to the maximum according to the change in solar intensity or temperature, thereby improving the fishiness.

The MPPT means controlling the output current of the DC_DC converter so that the maximum efficiency can be achieved while monitoring the output voltage and current using a DC_DC converter and MCU that can arbitrarily adjust the current.

On the other hand, in the present invention, the battery pack is provided with a plurality of cooling fans 216, and the cooling fan has an effect of extending the overall life of the battery by lowering the temperature of the battery that generates heat during charging and discharging.

Referring to FIG. 6, in more detail, the battery pack is installed inside the battery housing 211, and the battery housing 211 includes an internal housing 212 in which a plurality of batteries are stored, and the internal housing ( 212) is composed of a housing cover 213 provided on the outside.

The internal housing 212 has a rectangular frame shape with a space formed therein, and a partition wall 214 is formed to have a plurality of separated spaces, and a plurality of cylindrical lithium ion battery modules are provided in each space. It is embedded.

In addition, a plurality of through-holes 215 are formed on the side wall and the partition wall 214 of the interior housing 212, and a cooling fan 216 is provided on the outside surface of the interior housing 212 on which the through-hole 215 is formed. As installed, the air discharged from the cooling fan is transferred to the interior housing through the through-hole to cool the generated battery.

In addition, the battery housing 211 is preferably made of an anodized aluminum material.

The anodizing is a kind of surface post-processing processing to form an oxide film on the surface of an aluminum product, and prevents oxidation of the product and improves the durability of the product, and has an effect of being resistant to contamination and deterioration and enabling semi-permanent use.

Meanwhile, the household energy storage device (ESS) 200 may be used in connection with an energy management system (EMS) 250, which is software that serves to control and monitor the operation method of the ESS.

Since the present invention utilizes a home energy storage device, it will be preferable that the EMS is a HEMS (Home Energy Management System) that optimizes home energy use.

The HEMS is a system to network and automatically control lighting, home appliances, etc., which are energy sources such as electric power, gas, and hot water in the home, using IT technology, and is a system that helps to efficiently control energy in the general home.

That is, the EMS analyzes the power generation system of the ESS in real time by monitoring the charging and discharging time of the ESS, predicting the amount of power generation and demand by algorithmizing power consumption pattern information, weather information, etc., and monitoring and controlling it through a communication network. It is an infrastructure technology to provide a variety of services at the same time.

On the other hand, some of the power stored in the household energy storage device 200 is consumed in the home, the remaining surplus power can be sold to businesses and general consumers.

In other words, the user acts as a prosumer by utilizing the home energy storage device 200.

The prosumer is a compound word of'producer', which means'producer', and'consumer', which means'consumer', and refers to consumers participating in production. It means the consumer and producer who consumes and also participates in the production of electricity.

The prosumer is capable of producing and using electric power and selling the remaining surplus electric power to enterprises and general consumers through the electric power trading platform. The electric power trading platform collects and analyzes data on the amount of power generation of the household energy storage device, etc. In addition, it monitors electricity production and consumption in real time to provide predictive information.

The power trading platform 300 is a central energy management system, which is connected to a plurality of household energy storage devices 310, receives and stores surplus electric power for each household, and stores it together, and then re-generates it to the general household 10 and power system ( Power provider) (20), electric vehicle charging station (30), etc. are connected to sell (transact) power.

In addition, the power transaction platform 300 is to include a large-capacity energy storage device 310, the large-capacity energy storage device 310 is connected to a plurality of home energy storage device 200, surplus power for each household It is supplied and merged and stored, and is also connected to an electric vehicle charging station 30 or a power system 20 such as KEPCO to transmit power.

In addition, the information extracted from the power transaction platform 300 is provided to a terminal of a customer or an administrator (for example, a smartphone, a tablet PC, etc.).

In more detail, the power trading platform 300 includes a communication unit 320, a data storage unit 330, a monitoring unit 340, a prediction unit 350, a display unit 360, and an integrated control unit 370. Includes.

The communication unit 320 is connected to at least one home energy storage device 200 through wireless communication, receives data transmitted from the home energy storage device 200, and sends a control command signal to the home energy storage device. It serves to transmit.

In addition, the communication unit 320 is also connected to enable communication with each other through wireless communication with institutions such as the power system 20 and the electric vehicle charging station 30 to receive and transmit data.

Here, the power system 20 means a power plant, a substation, a power transmission station, and the like.

The data storage unit 330 collects and stores data such as a home energy storage device received through the communication unit 320.

The monitoring unit 340 analyzes the data collected from the data storage unit to monitor power production and consumption in real time, and generates monitoring data. It monitors whether power is transmitted/received between the household energy storage devices and the amount of power. .

In addition, the monitoring unit 340 monitors the PCS status (ON/OFF, voltage, current, output), battery status (SOC, SOH, temperature, voltage, current, failure) of the household energy storage device. When a failure or error occurs in the home energy storage device, it is transmitted to the display unit 360 to inform the user.

The prediction unit 350 predicts patterns of energy production and consumption using the monitoring data generated by the monitoring unit to generate prediction data, and the prediction unit generates metering data, preferences, and producers of each household energy storage device. And generating the prediction data such as matching the producer and the consumer in consideration of the transaction scope of the consumer.

The display unit 360 visually displays prediction information provided by the prediction unit and receives a user's control command.

The integrated control unit 370 controls the communication unit, the data storage unit, the monitoring unit, the prediction unit, and the display unit, and charges and discharges energy storage devices and large-capacity energy storage devices, transmits power to the power system, and supplies power to loads. It serves to control.

In addition, the integrated control unit is controlled so that the excess energy of the household energy storage device is automatically transferred to the mass storage device when the ratio is stored above a certain value (for example, 70 to 80% in the battery).

In addition, the integrated control unit allows the power stored in the home energy storage device to be automatically transmitted to the mass storage device at sunset.

In addition, the power trading platform 300 is provided with a power management server, a financial server, and the like, so that the prosumer power trading system to be constructed in the present invention can be efficiently made.

Meanwhile, the prosumer trades energy (power) through the following steps.

First, power generated from the home solar power generation device 100 is stored in the home energy storage device 200.

Thereafter, some of the power stored in the household energy storage device 200 is consumed in the home, and the remaining surplus power is transmitted to the large-capacity energy storage device 310.

And the power stored in the large-capacity energy storage device 310 is traded through the power trading platform (300).

That is, the prosumer stores the power generated from the photovoltaic device 100 in the home energy storage device 200, first uses it in the home, and transmits the surplus power to the large-capacity energy storage device 310, and the power Through the trading platform 300, power is transmitted and sold to other general households.

And after that, the remaining surplus electric power will be connected to the electric power system (20) to generate profits by selling electricity by using the Renewable Energy Portfolio Standard (RPS) system, which is a mandatory new and renewable energy supply system. Make it possible.

The grid connection, as used herein, means that it is connected through a power system such as KEPCO and a power receiving facility to supply and cut electricity.

In addition, the home energy storage device 200 is connected to enable mutual data communication through a wired or wireless network, and a prosumer designates a specific home through a terminal to receive surplus power to the specific home, or surplus power from a specific home. Can be sent.

At this time, the prosumer uses the power trading platform 300 to trade power in a P2P manner with other prosumers, and in particular, trades power in a P2P manner using a blockchain.

And the power trading platform may use a SCADA system (Supervisory Control And Data Acquisition).

The SCADA system is a system in which a central control system monitors and controls a remote device by collecting, receiving, recording, and displaying status information data of a remote device using an analog or digital signal on a communication path. It serves to centrally monitor and control facility equipment.

The SCADA system may include a database server, an integrated management system, and an integrated operating system (IOS).

That is, the power trading platform is based on mobile and web, and the metering of customers matches power producers and consumers in consideration of data and preferences, power generation cost of electricity producers, and transaction ranges between producers and consumers, and charges. Provide customer service such as.

In addition, it would be desirable to match electricity producers and consumers at time intervals, present transaction prices and conditions to each other, and provide customers with various data such as power supply and purchase status, and usage fees.

In addition, in the present invention, the payment for power transactions is made to be paid through fintech electronic money.

As described above, the present invention has been described with reference to the embodiment shown in the drawings, but this is only for explaining the invention, and those skilled in the art to which the present invention pertains various modifications or equivalents from the detailed description of the invention It will be understood that one embodiment is possible.

Therefore, the true scope of the present invention should be determined by the technical spirit of the claims.

10: General household (prosumer)
20: Power system (power provider)
30: Electric vehicle charging station
100: solar power generation device
200: household energy storage device (ESS) 210: battery
211: battery housing 212: built-in housing
213: housing cover 214: bulkhead
215: Through hole 216: Cooling fan
220: battery management unit (BMS) 230: power converter (PCS)
240: MPPT 250: Energy Management System (EMS)
300: power trading platform 310: large-capacity energy storage device
320: communication unit 330: data storage unit
340: monitoring unit 350: prediction unit
360: display unit 370: integrated control unit
S410: Energy storage step S420: Energy consumption step
S430: Transmission stage S440: 1st supply stage
S450: Second supply stage
500: Terminal

Claims (3)

An energy storage step in which power generated from a home solar power generator is stored in a home energy storage device;
An energy consumption step of consuming power stored in the household energy storage device in the home through the energy storage step;
A transmission step in which excess power remaining in the household energy storage device is transmitted to a large-capacity energy storage device after the energy consumption step;
A primary supply step in which electric power stored in the large-capacity energy storage device is supplied to the general household through the power transmission platform through the power transmission step;
Including the secondary supply step of the surplus power after the primary supply step is supplied to at least one or more engines of an electric vehicle charging station or a power system;
In the transmission step, surplus power stored in the household energy storage device is automatically transmitted to a mass storage device when the ratio exceeds a predetermined predetermined value,
The power stored in the large-capacity energy storage device is directly traded in a peer-to-peer manner between prosumers through the power trading platform.
The power trading platform is linked to a plurality of household energy storage devices, receives and stores surplus power for each household, stores the combined power first, and supplies surplus power to at least one of an electric vehicle charging station and a power system. Lane supply to one or more institutions,
The power trading platform,
Communication unit provided to enable data communication with a plurality of home energy storage devices, power systems, and electric vehicle charging stations,
Data storage unit for collecting and storing the data received through the communication unit,
Monitoring unit that analyzes the data stored in the data storage unit to monitor the power production and consumption in real time and to generate monitoring data,
Prediction unit for predicting a pattern of energy production and consumption using the monitoring data generated by the monitoring unit and generating prediction data that matches producers and consumers in consideration of the transaction range between producers and consumers,
A display unit for visually displaying the prediction information provided by the prediction unit and receiving a user's control command,
Prosumer energy transaction method using a home energy storage device, characterized in that it comprises an integrated control unit for controlling the communication unit, data storage unit, monitoring unit, prediction unit, display unit.
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