KR20150094428A - Method and Apparatus for Trading Solar Energy - Google Patents

Abstract

The present invention relates to a solar energy selling apparatus and method, the solar energy selling apparatus comprising: a charging/discharging state information collecting unit which collects charging/discharging state information of an energy storing device storing energy generated in a solar power generating unit; a weather information collecting which receives weather information having an influence on the energy generated in the solar power generating unit from a meteorological agency; an SMP information collecting unit which collects system marginal price (SMP) information of the energy from a power trading market on which the energy generated in the solar power generating unit is traded; an SMP information classifying unit which classifies the SMP information for each time zone and generates time-zone SMP information; and a selling determining unit which determines whether to sell the energy stored in the energy storing device and the energy generated in the solar power generating unit on the basis of the time-zone SMP information, the charging/discharging state information, and the weather information.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for selling solar energy,

The present invention relates to a solar energy sales apparatus and a sales method.

Currently, photovoltaic power generation companies are engaged in power generation by contracting with electric power companies according to the capacity of photovoltaic facilities and participating in electric power market and trading energy. Energy trading through direct contract with electric utilities supplies energy produced through photovoltaic power generation to the power system and measures it with a smart meter so that the energy supply (kWh) for a month is calculated by weighted average system limit The price (SMP, System Marginal Price) is how the utility purchases the energy of the power generation company. SMP is the electricity market price applied to the electricity of generators other than nuclear power and coal.

Energy trading, which participates in the direct electricity market, is a way to sell energy at an hourly grid price. Currently, most PV companies are selling energy to electric power companies at monthly average grid price through power supply and supply contracts with electric power companies and do not consider energy storage devices connected with renewable energy.

Period (month) maximum at least Average SMP (KRW / kWh) 173.01 128.35 154.09

Table 1 shows the maximum / minimum / average value of the systematic marginal price for each hour of 2012, and it can be seen that the solar power company sold the energy at about 154 won / kWh in 2012. However, since the grid limit price varies depending on the time, most solar PV companies are paying the energy trading cost per month at the average SMP. Therefore, the additional profit of about 20 won / kWh is higher than when the energy trading cost is settled at the maximum SMP .

In addition, even if a solar power company trades energy through the electricity market, as shown in the figure below, when the solar power output is the maximum, the SMP price may not be high, so the maximum profit is not generated.

Korea Patent Publication No. 1020130020857

An embodiment of the present invention is to provide a solar energy sales apparatus and a sales method capable of increasing energy sales revenue by scheduling energy supply using SMP information and an energy storage device over time.

One embodiment of the present invention relates to a charge / discharge state information collecting unit for collecting charge / discharge state information of an energy storage device that stores energy generated in a solar photovoltaic generation unit, An SMP information collecting unit for collecting system marginal price (SMP) information of the energy from a power trading market where energy generated in the solar power generating unit is traded, a weather information collecting unit for receiving weather information from a weather station, An SMP information classifying unit for classifying the SMP information by time zone to generate SMP information by time zone, and an energy storage unit for storing the energy stored in the energy storage device based on the SMP information, the charge / discharge status information and the weather information, And a sales decision unit for determining whether or not to sell the energy generated by the solar energy sales unit Can.

In one embodiment, the solar energy sales apparatus receives a past weather information history from the weather station, calculates a weather information error rate from the weather information history, and uses the error rate and the weather information to calculate a weather information And a power generation amount predicting unit for predicting an amount of energy generated in the power generation unit.

In another embodiment, the sales decision unit may be configured to sell energy stored in the energy storage device and energy generated in the solar power generation unit when the SMP included in the SMP information for each time period is equal to or greater than a predetermined value, When the SMP included in the information is less than a predetermined value, the energy generated in the solar power generation unit can be stored in the energy storage device.

In another embodiment, the solar energy sales apparatus may further include a settlement unit for calculating a sales amount of energy stored in the energy storage device and energy generated in the solar power generation unit.

In another embodiment, the solar energy sales apparatus may further include a display unit for displaying at least one selected from the SMP information by time zone, the charge / discharge status information, the weather information, and the sales volume of energy .

According to another embodiment of the present invention, there is provided a method for controlling a solar battery, comprising the steps of: collecting charge / discharge status information of an energy storage device storing energy generated by a solar power generation unit; Collecting SMP (System Marginal Price) information from the power trading market where the energy generated in the solar power generating unit is traded, sorting the SMP information by time zone, Determining whether to sell the energy stored in the energy storage device and the energy generated in the solar power generator based on the SMP information for each time period, the charge / discharge status information, and the weather information, And a method of selling solar energy.

In another embodiment of the present invention, the solar energy sales method includes receiving a past weather information history from the weather station, calculating a weather information error rate from the weather information history, and using the error rate and the weather information, And estimating an amount of energy generated in the power generation unit.

In yet another embodiment, the step of determining whether to sell the energy may include determining whether the energy stored in the energy storage device and the energy generated in the solar photovoltaic generation part is greater than a predetermined value, And stores the energy generated by the solar power generation unit in the energy storage device when the SMP included in the SMP information for each time period is less than a predetermined value.

In yet another embodiment, the solar energy sales method may further comprise the step of accounting for sales of energy stored in the energy storage device and energy generated in the solar power generator.

In another embodiment, the solar energy sales method may further include displaying at least one selected from the SMP information by time segment, the charge / discharge status information, the weather information, and the sales volume of energy .

The apparatus and method for selling solar energy according to an embodiment of the present invention can increase energy sales revenue by scheduling energy supply using SMP information and energy storage device over time.

1 is a block diagram illustrating a solar energy sales system according to an embodiment of the present invention.
2 is an internal configuration diagram of a solar energy sales apparatus according to an embodiment of the present invention.
FIG. 3 is a graph showing the amount of energy generated in the solar power generation unit with time and the degree of change of SMP with time.
4 is a flowchart illustrating a method of selling solar energy according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like.

The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art to which the present invention pertains. Only. Therefore, the definition should be based on the contents throughout this specification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a solar energy sales system according to an embodiment of the present invention.

1, a solar energy sales system according to an embodiment of the present invention includes a solar power generation unit 110, an energy storage device 120, an inverter 130, a solar energy sales device 140, Meter 170 may be included.

The solar power generation unit 110 can collect light energy from the sun and convert light energy into electric energy.

The energy storage device 120 may store the electric energy generated by the solar power generation unit 110. [ In one embodiment, the solar energy vending machine 140 may sell the energy generated by the solar power generator 110 and store the remaining energy in the energy storage device 120. In addition, if the SMP value is less than the predetermined value, sales can be held and the energy generated in the solar power generation unit 110 can be stored in the energy storage device 120. [ This allows us to sell solar energy at an optimal price.

Furthermore, even when the solar power generation unit 110 does not generate electricity, the energy stored in the energy storage device 120 can be sold when the SMP value is equal to or greater than a predetermined value. The solar energy sales apparatus 140 according to an embodiment of the present invention can determine whether to sell energy in conjunction with the SMP value.

The inverter 130 can convert direct current (DC) to alternating current (AC). Since the energy generated by the solar power generation unit 110 corresponds to DC and the energy supplied from the power company 180 to the consumer is AC, the energy transmitted to the power company must be AC, It is necessary to change the shape of the energy.

The smart meter 170 can measure the amount of energy sold to the utility 180. [

2 is an internal configuration diagram of a solar energy sales apparatus according to an embodiment of the present invention.

2, a solar energy sales apparatus 140 according to an embodiment of the present invention includes a charge / discharge state information collection unit 141, a weather information collection unit 142, an SMP information collection unit 143, an SMP An information classification unit 144, and a sales decision unit 145. [

The charge / discharge status information collection unit 141 may collect the charge / discharge status information of the energy storage device 120 that stores the energy generated by the solar power generation unit 110. In one embodiment, assuming that the weather condition is good the day before sale and the usage rate of the solar power generation unit 110 is high but the SMP at the time of daylight hours is formed with a low price pattern, The energy storage device 120 may be discharged to supply energy to the electric power company 180 when the SMP is formed at a higher price than by supplying energy to the energy storage device. Therefore, in order to manage the energy trading on the same day, it is necessary to collect charge / discharge status information of the energy storage device 120 one day before.

The weather information collecting unit 142 can receive the weather information influencing the amount of energy generated by the solar power generating unit 110 from the weather station 150. The weather information collecting unit 142 may collect information provided every hour from the weather station 150 or may collect the weather information by transmitting a message requesting the weather station 150 periodically.

The SMP information collection unit 143 may collect system marginal price (SMP) information of the energy from the power trading market 160 where the energy generated in the solar power generation unit 110 is traded.

FIG. 3 is a graph showing the amount of energy generated in the solar power generation unit with time and the degree of change of SMP with time.

Referring to FIG. 3, the solar power generation unit 110 can generate the maximum energy between 12 o'clock and 14 o'clock. However, since many solar power generation companies sell energy, the SMP temporarily decreases . In order to reflect such a change in the energy sales decision, the SMP information collection unit 143 can collect the SMP over time, and the solar energy sales apparatus 140 can utilize the price determination to obtain the maximum profit have.

The SMP information classification unit 144 can generate SMP information for each time period by classifying the SMP information by time zone. Since the energy generated by the solar power generation unit 110 has a large difference in generation amount in each time period, SMP information for each time period can be generated and utilized for determining an optimal selling price.

The sales decision unit 145 can determine whether to store the energy stored in the energy storage device 120 and the energy generated in the solar power generation unit 110 based on SMP information, charge / discharge status information, and weather information by time zone . In one embodiment, when the SMP included in the SMP information for each time period is equal to or greater than a predetermined value, the sales decision unit 145 stores the energy stored in the energy storage device 120 and the energy generated in the solar power generation unit 110 can do. In addition, when the SMP included in the SMP information for each time period is less than a predetermined value, it may be determined to store the energy generated by the solar power generation unit 110 in the energy storage device 120. [

The solar energy sales apparatus 140 according to an embodiment of the present invention may further include a power generation amount predicting unit 146. [ The power generation amount predicting unit 146 receives the past weather information history from the weather station, calculates the weather information error rate from the weather information history, and calculates the amount of energy generated in the solar power generator 110 using the error rate and the weather information Can be predicted.

For example, make sure that weather information on the day of development is included within the error range set by the power generation company. The day before the energy trading was good and the sunshine amount was large, but on that day, due to the unpredictable weather deterioration, the photovoltaic generation would be impossible and the energy stored in the energy storage device 120 should be sold the day before .

If climate change is similar to past patterns, PV operators can predict the generation of energy from solar power generation. You can calculate solar utility usage rates with data from past similar weather conditions, such as sunrise times, sunset times, and sunshine. In order to sell the energy on that day, the power generation company can collect hourly SMP information of the power trading market.

The solar energy sales apparatus 140 according to an embodiment of the present invention may further include a settlement unit 147 and a display unit 148. [

The settlement unit 147 can settle the sales amount of the energy stored in the energy storage device and the energy generated in the solar power generation unit.

The display unit 148 may display any one or more pieces of information selected from SMP information by time zone, the charge / discharge status information, the weather information, and the sales volume of energy. This allows PV operators to see the real-time amount of energy currently sold.

The solar energy sales apparatus 140 according to an embodiment of the present invention can estimate the power generation amount according to the weather information, the solar power generation and energy storage device operation scheduling according to deriving the SMP priority by time of the power market, It can provide a method of operation.

Hereinafter, a specific embodiment will be described.

Table 2 summarizes some of the embodiments of the present invention.

Example SMP slot Energy storage device Solar power generation department Availability One 180 12-13 Rechargeable Power generation possible sale 2 170 10-11 Discharge possible Unable to develop sale 3 160 9-10 Rechargeable Unable to develop Hold for sale 4 150 13-14 Rechargeable Power generation possible Hold for sale 5 140 16-17 Discharge possible Unable to develop sale 6 130 15-16 Rechargeable Power generation possible Hold for sale

 In the first embodiment, the SMP value is set to be higher than a predetermined value, and the solar power generator can generate electricity, so that the energy generated in the solar power generator can be sold.

 In the second embodiment, although the SMP value is set higher than a predetermined value, the solar power generation part can not generate electricity. Thus, the energy stored in the energy storage device can be discharged to determine the energy sales.

 In Example 3, although the SMP value is set to be higher than a predetermined value, the solar power generation portion can not generate electricity. Therefore, energy can not be sold because there is no energy stored in the energy storage device.

In the fourth embodiment, the SMP value is determined to be lower than a predetermined value, and sales are not performed. At this time, the photovoltaic power generation unit can generate power and the energy storage unit can be charged, so that the energy generated by the photovoltaic power generation unit is charged into the energy storage unit.

In the example 5, the SMP value is set to be lower than the predetermined value, and the solar power generation part can not generate electricity. However, if energy usage increases and the utility asks for a sale, it may sell the energy stored in the energy storage.

In the sixth embodiment, the SMP value is determined to be lower than a predetermined value and is not sold. At this time, the photovoltaic power generation unit can generate power and the energy storage unit can be charged, so that the energy generated by the photovoltaic power generation unit is charged into the energy storage unit.

4 is a flowchart illustrating a method of selling solar energy according to an embodiment of the present invention.

Referring to FIG. 4, in step S401, charge / discharge status information of the energy storage device 120 storing the energy generated by the solar power generation unit 110 may be collected.

It is possible to receive the weather information influencing the amount of energy generated in the solar power generation unit 110 from the weather station in step S402.

The past weather information history is received from the weather station 150 in step S403, the weather information error rate is calculated from the weather information history, and the amount of energy generated in the solar light generator is predicted using the error rate and the weather information .

The system margin price (SMP) information of the energy can be collected from the power trading market 160 where the energy generated in the solar power generation unit 110 is traded in step S404.

In step S405, SMP information can be generated by time zone by classifying the SMP information by time zone.

In step S406, it is possible to determine whether the energy stored in the energy storage device and the energy generated in the solar power generation part 110 are sold based on the SMP information by time, the charge / discharge status information, and the weather information.

The amount of energy stored in the energy storage device 120 and the amount of energy generated in the solar power generation part 110 can be settled in step S407.

In step S408, it is possible to display any one or more pieces of information selected from the SMP information by time zone, the charge / discharge status information, the weather information, and the sales volume of energy.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art It will be possible. An exemplary storage medium would be capable of associating with the processor so that the processor could read information from, and write information to, the storage medium. Alternatively, the storage medium may be incorporated into the processor. The processor and the storage medium may reside in an ASIC. The ASIC may be located within the user terminal. Alternatively, the processor and the storage medium may reside as separate components in a user terminal.

All of the processes described above may be implemented within one or more general purpose or special purpose computers or software code modules executed by processors, and may be fully automated via the software code modules. The code modules may be stored on any type of computer-readable medium or on a collection of other computer storage devices or storage devices. Some or all of the above methods may alternatively be implemented within specialized computer hardware.

All of the methods and tasks described herein may be performed by a computer system and be fully automated. The computer system, in some cases, may be a computer system or a plurality of separate computers or computing devices (e.g., physical servers, workstations, , Storage arrays, etc.). Each such computing device typically includes a processor (or a collection of multiple processors or a circuit or a circuit, e.g., a module) that executes program instructions or modules stored in memory or other non-transitory computer- to be. Although some or all of the various functions described herein may be implemented as application-specific circuitry (e.g., ASICs or FPGAs) in a computer system, the various functions described may be implemented with such program instructions . When the computer system includes a plurality of computing devices, the devices may not be deployed in the same location, but may be deployed together. The results of the disclosed methods and tasks may be permanently stored in different states by solid state memory chips and / or by transducing physical storage devices such as magnetic disks.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

110: Solar power generation part
120: Energy storage device
130: inverter
140: Solar energy sales device
141: charge / discharge state information collecting unit
142: weather information collecting unit
143: SMP information collecting unit
144: SMP information classification unit
145:
146: Power generation estimating unit
150: Weather Agency
160: Power Trading Market
170: Smart meter
180: Power company

Claims (10)

A charge / discharge state information collecting unit for collecting charge / discharge state information of an energy storage device that stores energy generated in a solar power generation unit;
A weather information collecting unit for receiving weather information influencing energy generated by the solar power generator from a weather station;
An SMP information collecting unit for collecting System Marginal Price (SMP) information of the energy from a power trading market where energy generated in the solar power generating unit is traded;
An SMP information classifying unit for classifying the SMP information by time zone and generating SMP information by time zone; And
A sales decision unit for determining whether the energy stored in the energy storage device and the energy generated in the solar power generation unit are sold based on the SMP information for each time period, the charge / discharge status information, and the weather information;
And a solar cell.
The method according to claim 1,
The solar energy sales apparatus
A power generation amount estimation unit that receives a past weather information history from the weather station, calculates a weather information error rate from the weather information history, and estimates an amount of energy generated in the solar photovoltaic generation unit using the error rate and the weather information part;
Further comprising a photovoltaic device.
The method according to claim 1,
The sales decision unit
Selling energy stored in the energy storage device and energy generated in the solar power generator when the SMP included in the SMP information per time period is equal to or greater than a predetermined value,
And stores the energy generated by the solar power generation unit in the energy storage device when the SMP included in the SMP information for each time period is less than a predetermined value.
The method according to claim 1,
The solar energy sales apparatus
A settlement unit for calculating a sales amount of energy stored in the energy storage device and energy generated in the solar power generation unit;
Further included solar energy sales devices.
5. The method of claim 4,
The solar energy sales apparatus
A display unit for displaying at least one selected from the SMP information for each time period, the charge / discharge status information, the weather information, and the sales amount of energy;
Further comprising a photovoltaic device.
Collecting charge / discharge status information of an energy storage device that stores energy generated by the solar power generation unit;
Receiving weather information from the weather station influencing the amount of energy generated by the solar power generator;
Collecting System Marginal Price (SMP) information of the energy from the power trading market where the energy generated in the solar power generating unit is traded;
Generating SMP information by time zone by classifying the SMP information by time zone;
Determining whether the energy stored in the energy storage device and the energy generated in the solar power generator are sold based on the SMP information for each time period, the charge / discharge status information, and the weather information;
≪ / RTI >
The method according to claim 6,
The solar energy sales method
Receiving a past weather information history from the weather station, calculating a weather information error rate from the weather information history, and estimating an amount of energy generated in the solar photovoltaic generation unit using the error rate and the weather information;
≪ / RTI >
The method according to claim 6,
The step of determining whether to sell the energy
Selling energy stored in the energy storage device and energy generated in the solar power generator when the SMP included in the SMP information per time period is equal to or greater than a predetermined value,
And stores the energy generated by the solar power generation unit in the energy storage device when the SMP included in the SMP information for each time period is less than a predetermined value.
The method according to claim 6,
The solar energy sales method
Calculating a sales amount of energy stored in the energy storage device and energy generated in the solar power generation part;
Further included solar energy sales method.
10. The method of claim 9,
The solar energy sales method
Displaying the SMP information for each time period, the charge / discharge status information, the weather information, and the sales amount of energy;
≪ / RTI >

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