KR101571439B1 - System and method for transaction solar energy for home - Google Patents

Abstract

The present invention relates to a system and method for home solar energy trading, which is connected to at least one home BESS through a communication network and receives at least one of solar power generation amount, weather data, battery power, Calculates a power allocation amount of the corresponding assumption based on the derived predicted power generation amount, and transmits a power trading control signal including the calculated power allocation amount to a corresponding home BESS And a remote terminal device communicating with the local integrated management system through a communication network, the system comprising: a bi-directional converter and a bidirectional inverter for charging or discharging a battery; When a control signal is received, the bidirectional inverter and the bidirectional converter are controlled And one or more home BESSs that perform power trading to supply the power corresponding to the power allocation amount to the system among the powers stored in the battery.

Description

TECHNICAL FIELD The present invention relates to a system and a method for trading solar energy in a home,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a system and method for home solar energy trading, and more particularly, A system for home solar energy trading in which each household collects at least one piece of information on the amount of power consumed and calculates a power allocation amount for power trading of each household based on the collected information, And methods.

In general, the solar power generation system, which is a new energy field, is a technology for converting infinite and non-pollution solar energy directly into electric energy. More specifically, when a solar cell composed of a semiconductor (pn) junction is irradiated with sunlight Electro-bore pairs are generated by light energy, and electromotive force is generated by the photovoltaic effect in which electrons and holes move and current flows across the n-layer and the p-layer, Flow.

Recently, the government has actively participated in technology development and supply support for new and renewable energy sources such as solar power and wind power, but it has been technically and systematically problematic.

For example, technologies related to renewable energy such as photovoltaic power generation, which have recently been linked to the grid, are as follows: 1) customers in charge of offsetting transactions (less than 3kW); 2) renewable energy generation companies; (Electricity trading customers), and 4) installers of private renewable energy generation facilities (electric power trading customers).

Since 1990, when the supply of new and renewable energy has begun to expand under government initiative, solar power generation systems are installed and operated in more than 2,000 places. Also, government offices and other government offices such as city hall, In the case of installing solar PV system, if it is not for electric power companies, it is required to install a reverse power relay at the linkage point according to the power grid connection guide with KEPCO.

However, in order to be a renewable energy power generation company such as solar power and wind power, it has a disadvantage that an individual or a company has to secure a sufficient site or a large-scale facility investment cost.

In addition, although a large number of solar power generation homes are being supplied by the 'Green Home 100 Supply Project', they can only play a limited role, such as reducing the electricity cost of each household, and are not playing a role as power generation companies.

Korean Patent No. 10-0816531, entitled " Method for Estimating Proper Installed Capacity of Photovoltaic System "

The object of the present invention is to provide a system and method for home solar energy trading that can construct a photovoltaic generation system even in a city where the available space is limited, .

It is another object of the present invention to provide a solar power system capable of saving residual power produced by a solar photovoltaic system through a BESS and connecting to a local integrated management system in a network operation center of a local power generation company, And to provide a system and method for energy trading.

According to an aspect of the present invention, there is provided a home network system comprising: at least one home BESS connected to a home network through a communication network; and at least one of solar power generation amount, weather data, battery power, Calculates a predicted power generation amount based on the collected information, calculates a power allocation amount of the corresponding home based on the derived predicted power generation amount, and transmits a power trading control signal including the calculated power allocation amount to the corresponding home BESS A local integrated management system, and a remote terminal device communicating with the local integrated management system through a communication network, the system comprising: a bidirectional converter and a bi-directional inverter for charging or discharging a battery; receiving a power transaction control signal from the local integrated management system Control both bidirectional inverter and bidirectional converter to save to battery The system for residential solar energy transaction comprising at least one groove BESS to perform power exchange to supply power to the power allocations corresponding to the grid is provided from the power.

Wherein the local integrated management system comprises: a communication unit connected to at least one home BESS through a communication network; a collecting unit collecting at least one of solar power generation amount, weather data, battery power, and power consumption amount from the home BESS through the communication unit; A power generation amount predicting unit for deriving a predicted power generation amount based on at least one of solar power generation amount, weather data, battery power, and power consumption amount collected by the collecting unit; And a power allocation unit for calculating an allocation amount and transmitting the power transaction control signal including the calculated power allocation amount to the corresponding home BESS through the communication unit.

Wherein the power generation amount predicting unit selects past dates in the same environment as the trading day, calculates past weather data by analyzing weather conditions of each of the selected dates, calculates future weather data by analyzing weather conditions by future time, The predicted power generation amount can be derived based on the calculated past weather data and future weather data.

The home BESS includes at least one solar panel, an MPTT converter for converting and outputting power generated from the solar panel, a charging mode for converting the DC voltage output from the MPTT converter into a charging voltage of the battery, A bidirectional converter that operates in a discharge mode for converting a voltage of the battery to a direct current voltage, a battery that supplies power to the system from the power or system power output from the bidirectional converter, A bidirectional inverter operating in a discharge mode for converting the DC voltage into an AC voltage of the system or a charge mode for converting an AC voltage of the system to a DC voltage, a bidirectional inverter connected to the bidirectional inverter, Forward transaction control including power allocation And a remote terminal device for controlling the bidirectional inverter and the bidirectional converter to perform power trading to supply the power corresponding to the power allocation amount to the grid among the powers stored in the battery when the signal is received.

According to another aspect of the present invention, there is provided a method for a home solar energy transaction, wherein a local integrated management system collects at least one of solar power generation amount, weather data, battery power, and power consumption amount from a home BESS connected through a communication network Calculating a predicted power generation amount based on the collected information, calculating a power allocation amount of the corresponding home based on the derived predicted power generation amount, and transmitting a power trading control signal including the calculated power allocation amount to the corresponding home BESS A method for home solar energy trading is provided.

The step of deriving the predicted generation amount based on the collected information may include the steps of: selecting past dates in the same environment as the trading day, analyzing the weather conditions by time of the selected dates to calculate past weather data, To calculate future meteorological data, and to derive a predicted generation amount based on the calculated past meteorological data and future meteorological data.

According to the present invention, an object of the present invention is to construct a photovoltaic power generation system even in a city where the available space is limited, or in a place where land purchase cost is high, by using the solar light infrastructure installed in each home.

In addition, it is possible to charge the remaining power generated by the residential solar photovoltaic system through the BESS and to connect with the local integrated management system in the network operation center of the regional power generation companies to enable electric power transaction bidding.

1 is a conceptual diagram illustrating a system for household solar energy trading according to an embodiment of the present invention;
2 illustrates a system for residential solar energy trading according to an embodiment of the present invention.
3 is a block diagram schematically showing a configuration of a local integrated management system according to an embodiment of the present invention;

The foregoing and other objects, features, and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

Hereinafter, a system and method for home solar energy trading according to the present invention will be described in detail with reference to the accompanying drawings. The embodiments are provided so that those skilled in the art can easily understand the technical spirit of the present invention, and thus the present invention is not limited thereto. In addition, the matters described in the attached drawings may be different from those actually implemented by the schematic drawings to easily describe the embodiments of the present invention.

In the meantime, each constituent unit described below is only an example for implementing the present invention. Thus, in other implementations of the present invention, other components may be used without departing from the spirit and scope of the present invention. In addition, each component may be implemented solely by hardware or software configuration, but may be implemented by a combination of various hardware and software configurations performing the same function. Also, two or more components may be implemented together by one hardware or software.

Also, the expression " comprising " is intended to merely denote that such elements are present as an expression of " open ", and should not be understood to exclude additional elements.

1 is a conceptual diagram for explaining a system for household solar energy trading according to an embodiment of the present invention.

Referring to FIG. 1, Home Bess is constructed by adding a BESS (Battery Energy Storage System) and an RTU (Remote Terminal Unit) to a PV power infrastructure installed in each home. Here, BESS includes a bi-directional converter and a battery.

Residual electric power generated by the residential solar photovoltaic system is stored via BESS and connected to LEMS (Local EMS, hereinafter referred to as Local Integrated Management System) in the network operation center of the regional power generation companies to enable electric power bidding . Here, the LEMS may be a system having control authority held by the HEMS (Home EMS) provided in each home.

A local integrated management system that integrally controls energy collects information such as solar power generation amount, weather data, and battery storage energy amount from each home through a remote terminal device, and analyzes the collected information using a big data technology .

Referring now to FIG. 2, a system for home solar energy trading will be described.

FIG. 2 is a diagram illustrating a system for residential solar energy trading according to an embodiment of the present invention, and FIG. 3 is a block diagram schematically showing the configuration of a local integrated management system according to an embodiment of the present invention.

2, a system for home solar energy trading includes a home BESS 100 installed in each home, a local integrated management system 100 connected to each home BESS 100 through a communication network and controlling each home BESS 100, (LEMS, 200).

The home BESS 100 includes a remote terminal device 160 for communicating with the local integrated management system 200 through a communication network and includes a bidirectional converter 130 and a bidirectional inverter 150 for charging or discharging the battery 140, And performs charging or discharging of the battery 140 under the control of the local integrated management system 200.

The home BESS 100 plays various roles such as power transmission (sales) to the system through the charging of the battery using solar energy using the bidirectional converter 130 and power sales using nighttime energy, And the local integrated management system 200 through a communication network.

The home BESS 100 controls the bidirectional inverter 150 and the bidirectional converter 130 so that the electric power stored in the battery 140 is supplied to the home BESS 100, And performs power trading to supply power corresponding to the power allocation amount to the system.

The home BESS 100 includes a solar panel 110 for power generation, a maximum power point tracking (MPPT) converter 120, a bidirectional converter 130, a battery 140, a bidirectional inverter 150, and a remote terminal unit (RTU) 160.

The solar panel 110 is a device that continuously generates enormous energy and converts the sun's light energy, which is a semi-permanent energy of life, directly into electric energy. Since it is not accompanied by chemical change physically, It is a pollution-free development method that does not exist. In addition, since the solar panel 110 has no moving parts, no noise is generated, and there is no combustion part, and the system is relatively simple compared to other power generation systems, so that the maintenance is easy and the unmanned operation becomes possible.

The MPPT converter 120 converts the DC voltage output from the solar panel 110 to a DC voltage and the output of the solar panel 110 changes in accordance with the climate change and the load condition depending on the solar radiation amount and the temperature, And controls to produce the maximum power from the light panel 110. That is, the MPPT converter 120 performs the MPPT control function together with the boost DC-DC converter function for boosting the output DC voltage of the solar panel 110 to output the DC voltage. For example, the MPPT output DC voltage range may be 300-600V. In addition, MPPT control is performed to follow the maximum power output voltage of the solar panel 110 according to changes in the solar radiation amount, temperature, and the like. For example, Perturbation and Observation (P & O) control, IncCond (Incremental Conductance), and power vs. voltage control can be used. The P & O control is to increase or decrease the command voltage by measuring the power overvoltage of the solar cell. The IncCond control is to control the output conductance of the solar cell by comparing the incremental conductance and the power to voltage control uses the power to voltage slope . It goes without saying that another MPPT control technique other than the MPPT control described above can be applied.

The bidirectional converter 130 operates in a charging mode for converting a DC voltage generated in the solar panel 110 into a charging voltage for the battery 140 or a discharging mode for converting an output voltage of the battery 140 to a DC voltage.

That is, the bidirectional converter 130 DC-DC converts the power stored in the battery 140 in the discharge mode to a voltage level required by the bidirectional inverter 150, that is, a DC voltage. The bidirectional converter 130 performs DC-DC conversion of the charging power flowing through the solar panel 110 in the charging mode to a voltage level required by the battery 140, that is, a charging voltage. Here, the charging power may be the electric power supplied from the solar panel 110 or the electric power supplied through the bidirectional inverter 150 from the system. The bidirectional converter 130 may stop operation when battery 140 is not required to be charged or discharged to minimize power consumption.

The battery 140 receives and stores the electric power or the power of the system produced by the solar panel 110 through the bidirectional converter 140 and stores the electric power corresponding to the electric power allocation amount determined in the local integrated management system 200 Power to the system.

The battery 140 may include at least one battery cell, and each battery cell may include a plurality of bare cells. The battery 140 may be implemented in various types of battery cells and may be a nickel-cadmium battery, a lead-acid battery, a nickel metal hydride battery (NiMH), a lithium- a lithium ion battery, a lithium polymer battery, and the like. The number of batteries 140 can be determined according to the power capacity, design conditions, and the like required in the home BESS 100.

The bidirectional inverter 150 operates in a discharge mode for converting the direct current voltage into the alternating current voltage of the system or a charging mode for converting the alternating voltage of the system to the direct current voltage.

That is, the bidirectional inverter 150 converts the DC voltage output from the solar panel 110 or the battery 140 into the AC voltage of the system in the discharge mode and outputs the AC voltage. The bidirectional inverter 150 rectifies the AC voltage of the system to convert the DC voltage into a DC voltage and stores it in order to store the power of the system in the battery 140 in the charging mode. The bidirectional inverter 150 may include a filter for removing harmonics from the alternating voltage output to the system. In order to suppress the generation of reactive power, the bidirectional inverter 150 may be configured so that the phase of the alternating voltage output from the bidirectional inverter 150 and the phase of the alternating- And a phase locked loop (PLL) circuit for synchronizing the phases.

In addition, the bi-directional inverter 150 can perform functions such as limiting the voltage fluctuation range, improving the power factor, removing direct current components, and protecting transient phenomena.

The bidirectional inverter 150 does not need to supply the power generated by the solar panel 110 or the power stored in the battery 140 to the system or when the battery 140 is charged, The operation of the bidirectional inverter 150 may be stopped in order to minimize the power consumption.

The remote terminal device 160 is connected to the bidirectional inverter 150 and communicates with the local integrated management system 200 through a communication network. And is connected to the local integrated management system 200 in the network operation center of each regional power generation company through the remote terminal device 160.

The remote terminal device 160 controls the bidirectional inverter 150 and the bidirectional converter 130 to receive the power control signal including the power allocation amount from the local integrated management system 200, So as to perform power trading to supply power to the system.

The local integrated management system 200 is connected to at least one home BESS 100 through a communication network and collects at least one of solar power generation amount, weather data, battery power, and power consumption amount from the home BESS 100, And the predicted power generation amount is derived based on the collected information. Then, the local integrated management system 200 calculates a power allocation amount for power trading of each home based on the predicted power generation amount, and transmits a power trading control signal including the calculated power allocation amount to the corresponding home BESS 100 .

The local integrated management system 200 controls the overall operation of the home BESS 100 and determines whether the operating mode of the system, for example, whether to supply the developed power to the system, the battery 140, 140 or the like.

Also, the local integrated management system 200 transmits a control signal for controlling the switching operation of the bidirectional inverter 150 and the bidirectional converter 130, respectively. Here, the control signal minimizes the loss due to power conversion of the converter or inverter through duty-ratio optimal control according to the input voltage of each converter or inverter. To this end, the integrated management system 200 receives a voltage, current, and temperature sensing signals from the respective input terminals of the bidirectional inverter 150 and the bidirectional converter 130, and transmits a control signal based on the sensing signals.

The local integrated management system 200 receives system information including the voltage, current, and temperature of the system according to the system conditions from the system. The local integrated control system 200 determines whether or not an abnormal situation occurs in the system, whether or not the system is abnormal, based on the system information, and controls the power supply to the system to be cut off, and the output of the two- So as to perform the sole-operation-prevention control.

3, the local integrated management system 200 includes a communication unit 210, a collection unit 220, a power generation amount predicting unit 230, and a power allocation unit 240 do.

The communication unit 210 is connected to at least one home BESS 100 through a communication network.

The collecting unit 220 collects at least one of solar power generation amount, weather data, battery power, and power consumption amount from the home BESS 100 through the communication unit 210.

The power generation estimating unit 230 derives the predicted power generation amount based on at least one of the solar power generation amount, the weather data, the battery power, and the power consumption amount collected by the collecting unit 210.

The power generation amount predicting unit 230 calculates past weather data by analyzing weather conditions of the selected days in the same environment as the trading day, And derives the predicted power generation amount based on the calculated past weather data and future weather data.

That is, the power generation amount predicting unit 230 selects past dates in the same environment as the trading day using the sunset and sunrise data. At this time, the power generation amount predicting unit 230 may select a date of 5 years or more in order to use as much past data as possible, and may select the same past days as the sunset and sunrise data are equal to or more than a predetermined constant value (for example, 80% .

Then, the power generation amount predicting unit 230 calculates an average value of the weather conditions for each time period of the selected past dates and calculates the past weather data. At this time, the power generation amount predicting unit 230 can calculate the average value of the time series such as the amount of clouds and the amount of solar radiation as past weather data.

Then, the power generation amount predicting unit 230 collects the weather conditions for each future time period from the weather forecasting system, calculates an average value of the weather conditions for each of the collected future time periods, and calculates the future weather data. The power generation amount predicting unit 230 analyzes the past weather data and the future weather data to derive the predicted weather data. The power generation estimating unit can confirm the solar power generation amount of the date having the past meteorological data equal to or more than a predetermined constant value (e.g., 90%) with the predicted vapor data and derive the confirmed solar power generation amount as the predicted power generation amount.

The power allocating unit 240 calculates a power allocation amount for power trading of each home based on the predicted power generation amount derived from the power generation amount predicting unit 230 and transmits a power trading control signal including the calculated power allocation amount to the home BESS 100).

That is, the power allocating unit 240 confirms the battery power and the power consumption of the corresponding home, and calculates a power allocation amount for power trading using the predicted power generation amount, the battery power, and the power consumption amount. For example, the power allocating unit 240 may calculate a certain ratio of the power obtained by subtracting the power consumption from the sum of the predicted power generation amount and the battery power as the power allocation amount. Then, the power allocation unit 240 transmits a power transaction control signal including a power allocation amount, home BESS identification information, and the like to the home BESS 100 through the communication unit.

The method for trading home solar energy can be programmed, and the codes and code segments constituting the program can be easily deduced by a programmer in the field. In addition, a program for a method for home solar energy trading can be stored in a readable medium readable by an electronic device, readable and executed by an electronic device.

Thus, those skilled in the art will appreciate that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Home BESS 110: Solar panel
120: MPPT converter 130: bidirectional converter
140: Battery 150: Bidirectional inverter
160: Remote terminal device 200: Local integrated management system
210: communication unit 220:
30: Power generation estimating unit 240: Power allocation unit

Claims (6)

The home BESS is connected to at least one home BESS (Home Battery Energy Storage System) through a communication network, and collects at least one of solar power generation amount, weather data, battery power, and power consumption amount from the home BESS, A local integrated management system for calculating a power allocation amount of a corresponding assumption based on the derived predicted power generation amount and transmitting a power trading control signal including the calculated power allocation amount to the corresponding home BESS; And
A bidirectional inverter for charging or discharging a battery and a bidirectional inverter; and a bidirectional inverter for receiving a power transaction control signal from the local integrated management system, One or more home BESSs performing a power transaction for controlling the bidirectional converter to supply power to the system corresponding to the power allocation amount among the powers stored in the battery;
Lt; / RTI >
The local integrated management system comprising:
The past weather data is calculated by analyzing the weather conditions according to the time of the selected dates, the weather data is collected from the weather forecast system in the future, and the future weather data is collected from the weather data Calculating the weather generation data, comparing the calculated past weather data with the future weather data, deriving the predicted generation amount by selecting past weather data in which the insolation amount for each time period coincides with a predetermined value or more,
Wherein a predetermined ratio of the power obtained by subtracting the power consumption from the sum of the predicted power generation amount and the battery power is calculated as a power allocation amount.
The method according to claim 1,
The local integrated management system comprising:
A communication unit connected to at least one home BESS through a communication network;
A collector for collecting at least one of solar power generation amount, weather data, battery power, and power consumption amount from the home BESS through the communication unit;
A power generation amount predicting unit that calculates a predicted power generation amount based on at least one of solar power generation amount, weather data, battery power, and power consumption amount collected by the collecting unit;
And a power allocator for calculating a power allocation amount of a corresponding home based on the predicted power generation amount derived from the power generation amount predicting unit and transmitting the power trading control signal including the calculated power allocation amount to the corresponding home BESS through the communication unit A system for home solar energy trading characterized.
delete The method according to claim 1,
The home BESS includes at least one solar panel;
An MPTT converter for converting and outputting power generated from the solar panel;
A bidirectional converter operating in a charging mode for converting a DC voltage output from the MPTT converter into a charging voltage of the battery or a discharging mode for converting an output voltage of the battery into a DC voltage;
A battery for receiving and storing power or power of the system output from the bidirectional converter and supplying power to the system corresponding to the power allocation amount among the stored power;
A bidirectional inverter operating in a discharge mode for converting the DC voltage into an AC voltage of the system or a charging mode for converting an AC voltage of the system into a DC voltage; And
And a control unit for controlling the bidirectional inverter and the bidirectional converter so as to control the bidirectional inverter and the bidirectional converter to transmit power corresponding to the power allocation amount among the powers stored in the battery when the power transaction control signal including the power allocation amount is received from the local integrated management system via the communication network, And a remote terminal device for controlling the power supply to supply power to the system.
A method for a local integrated management system for household solar energy trading,
Collecting at least one of solar power generation amount, weather data, battery power, and power consumption amount from a home BESS connected through a communication network;
Deriving a predicted power generation amount based on the collected information;
Calculating a power allocation amount of the assumption based on the derived predicted power generation amount, and transmitting a power trading control signal including the calculated power allocation amount to the corresponding home BESS;
Lt; / RTI >
The step of deriving the predicted power generation amount includes:
The past weather data is calculated by analyzing the weather conditions according to the time of the selected dates, the weather data is collected from the weather forecast system in the future, and the future weather data is collected from the weather data Calculating the weather generation data, comparing the calculated past weather data with the future weather data, deriving the predicted generation amount by selecting past weather data in which the insolation amount for each time period coincides with a predetermined value or more,
The step of transmitting the power trading control signal to the home BESS comprises:
Wherein a predetermined ratio of the power obtained by subtracting the power consumption from the sum of the predicted power generation amount and the battery power is calculated as a power allocation amount.
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